JP2019165267A - Terminal device, base station device and communication method - Google Patents

Abstract

To provide a terminal device which can efficiently communicate with a base station device, a base station device which communicates with the terminal device, a communication method to be used for the terminal device and a communication method to be used for the base station device, in which, for example, the terminal device and the communication method to be used for the base station device may include an uplink transmission method for reducing interference between cells and/or terminal devices, a modulation method and/or a coding method.SOLUTION: The terminal device receives information which identifies one or a plurality of sets of precoding available to transmit a random access preamble, and selects one precoding from the one or the plurality of sets of precoding, to transmit the random access preamble using the above selected one precoding.SELECTED DRAWING: Figure 13

Description

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

Currently, LTE, which is an extended standard for LTE (Long Term Evolution) in the Third Generation Partnership Project (3GPP), as a wireless access method and wireless network technology for the fifth generation cellular system
-A Technical examination and standard development of Pro (LTE-Advanced Pro) and NR (New Radio technology) are being performed (Non-Patent Document 1).

In the fifth generation cellular system, eMBB (enhanced Mobile BroadBand) that realizes high-speed and large-capacity transmission, URLLC (Ultra-Reliable and Low Latency Communication) that realizes low latency and high-reliability communication, IoT (Internet of Things), etc. Three types of mass machine type communication (mMTC) in which a large number of machine type devices are connected are required as service scenario scenarios.

  In NR, in order to broaden coverage mainly in high-frequency cells with large attenuation, a plurality of areas are set in the cell by beam forming, and signals are sequentially transmitted for each area to cover the entire cell. Has been studied (Non-Patent Document 2).

RP-161214, NTT DOCOMO, “Revision of SI: Study on New Radio Access Technology”, June 2016 3GPP R1-165559 http: // www. 3 gpp. org / ftp / tsg_ran / WG1_RL1 / TSGR1_85 / Docs / R1-165559. zip

  The present invention provides a terminal apparatus capable of efficiently communicating with a base station apparatus, a base station apparatus communicating with the terminal apparatus, a communication method used for the terminal apparatus, and a communication method used for the base station apparatus. For example, the communication method used for the terminal device and the base station device is an uplink transmission method, a modulation method, and / or a code for reducing interference between cells and / or terminal devices. It may also include a conversion method.

  (1) The aspect of this invention took the following means. That is, a first aspect of the present invention is a terminal device, wherein a reception unit that receives information specifying one or more precodings that can be used for transmission of a random access preamble, and the one or more A selection unit that selects one precoding from precoding; and a transmission unit that transmits the random access preamble using the selected one precoding.

(2) According to a second aspect of the present invention, there is provided a terminal device that receives information specifying one or more random access preambles that can be used for transmission of a random access preamble, and the usable unit A selection unit that selects one random access preamble from one or more random access preambles, and each of the one or more random access preambles is associated with one preamble sequence and one precoding, and is selected A transmission unit that transmits the selected random access preamble using the one preamble sequence and the one precoding associated with the random access preamble.

  (3) A third aspect of the present invention is a terminal device that receives information on a plurality of groups and identifies one or more available random access preambles included in each of the plurality of groups. A receiving unit for receiving information, and each of the plurality of groups is associated with one precoding of one or more available precodings, and selects one group from the plurality of groups, A selection unit that selects one random access preamble among one or more available random access preambles included in the selected group; and the one precoding associated with the selected group. Transmitter for transmitting one selected random access preamble using , Comprising a.

  (4) A fourth aspect of the present invention is a base station apparatus, which transmits information for identifying one or a plurality of precodings that can be used by a terminal apparatus for transmission of a random access preamble; A receiving unit that receives the random access preamble transmitted using one of the available one or more precodings.

  (5) According to a fifth aspect of the present invention, there is provided a transmission unit for transmitting information for identifying one or a plurality of random access preambles that can be used for transmission of a random access preamble by a terminal device. And each of the one or more random access preambles is associated with one preamble sequence and one precoding, and is associated with one random access preamble of the one or more random access preambles. And a receiving unit that receives the one random access preamble transmitted using one preamble sequence and the one precoding.

  (6) A sixth aspect of the present invention is a base station device that transmits information on a plurality of groups, and the terminal device can use one or a plurality of random accesses included in each of the plurality of groups. A transmitter that transmits information for specifying a preamble, and each of the plurality of groups is associated with one precoding of one or a plurality of available precodings, A receiving unit that receives one random access preamble of one or more available random access preambles included in the one group, transmitted using the one precoding associated with one group. And comprising.

  (7) According to a seventh aspect of the present invention, there is provided a communication method used in a terminal apparatus, which receives information specifying one or more precodings that can be used for transmission of a random access preamble, Alternatively, one precoding is selected from a plurality of precodings, and the random access preamble is transmitted using the selected one precoding.

(8) According to an eighth aspect of the present invention, there is provided a communication method used for a terminal device, which receives information specifying one or more random access preambles that can be used for transmission of a random access preamble, and uses the information Selecting one random access preamble from one or more possible random access preambles, each of the one or more random access preambles being associated with one preamble sequence and one precoding, the selected random The selected random access preamble is transmitted using the one preamble sequence associated with the access preamble and the one precoding.

  (9) A ninth aspect of the present invention is a communication method used for a terminal device, which receives information on a plurality of groups and can use one or a plurality of random numbers included in each of the plurality of groups. Receiving information identifying an access preamble, wherein each of the plurality of groups is associated with one precoding of one or more available precodings, and selects one group from the plurality of groups; Selecting one random access preamble from one or more available random access preambles included in the selected group, and using the one precoding associated with the selected group. The selected one random access preamble is transmitted.

  (10) A tenth aspect of the present invention is a communication method used for a base station apparatus, and information for specifying one or a plurality of precodings that can be used by a terminal apparatus for transmission of a random access preamble. Transmitting and receiving the random access preamble transmitted using one of the available one or more precodings.

  (11) An eleventh aspect of the present invention is a communication method used for a base station apparatus, and information for specifying one or a plurality of random access preambles that can be used by a terminal apparatus for transmission of a random access preamble Each of the one or more random access preambles is associated with one preamble sequence and one precoding, and is associated with one random access preamble of the one or more random access preambles. The one random access preamble transmitted using the one preamble sequence and the one precoding is received.

  (12) A twelfth aspect of the present invention is a communication method used for a base station apparatus, wherein information relating to a plurality of groups is transmitted, and a terminal apparatus that can be used is included in each of the plurality of groups. Or transmitting information for identifying a plurality of random access preambles, wherein each of the plurality of groups is associated with one precoding of one or more available precodings, Receiving one random access preamble of one or more available random access preambles included in the one group, transmitted using the one precoding associated with one of the groups; .

  According to the present invention, the terminal device and the base station device can efficiently communicate with each other.

1 is a conceptual diagram of a wireless communication system according to an embodiment of the present invention. It is a figure which shows an example of the sub-frame (sub-frame type) which concerns on embodiment of this invention. It is a flowchart which shows an example of operation | movement of the terminal device 1 which concerns on embodiment of this invention. It is a flowchart which shows an example of operation | movement of the base station apparatus 3 which concerns on embodiment of this invention. It is a conceptual diagram which shows an example of the uplink precoding which can be utilized in order for the terminal device 1 which concerns on embodiment of this invention to transmit a random access preamble to the base station apparatus 3. FIG. It is a figure which shows the case where the terminal device 1 which concerns on embodiment of this invention receives the downlink signal using the beam to which any of several different downlink precoding was applied by the base station apparatus 3. FIG. It is a figure which shows an example of the relationship between the beam used for the downlink signal which received the random access setting information which concerns on embodiment of this invention, and the available uplink precoding index shown by this random access setting information. It is a figure which shows an example of a table in case the subframe number which can be transmitted as a set of the available PRACH resources is shown in the random access setting information which concerns on embodiment of this invention. It is a figure which shows an example of the set of PRACH resources shown with the random access setting information which concerns on embodiment of this invention. It is a figure which shows an example of the relationship between the PRACH setting index which concerns on embodiment of this invention, the index of the uplink precoding used for transmission of a random access preamble, and the index of an available sub-frame number. FIG. 6 illustrates a contention based random access procedure according to an embodiment of the present invention. It is a flowchart which shows an example of the random access procedure of the terminal device 1 which concerns on embodiment of this invention. It is a flowchart which shows an example of the process regarding transmission of the random access preamble of the terminal device 1 which concerns on embodiment of this invention. It is a flowchart which shows an example of the process regarding reception of the random access preamble of the base station apparatus 3 which concerns on embodiment of this invention. It is a flowchart which shows an example of the resending process of the random access preamble in the terminal device 1 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the terminal device 1 which concerns on embodiment of this invention. It is a schematic block diagram which shows the structure of the base station apparatus 3 which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described.

LTE (and LTE-A Pro) and NR may be defined as different RATs (Radio Access Technology). NR may be defined as a technology included in LTE. This embodiment may be applied to NR, LTE and other RATs. In the following description, terms related to LTE will be used for explanation, but the present invention may be applied to other technologies using other terms.

FIG. 1 is a conceptual diagram of the wireless communication system of the present embodiment. In FIG. 1, the wireless communication system includes a terminal device 1A, a terminal device 1B, and a base station device 3. The terminal device 1A and the terminal device 1B are also referred to as the terminal device 1. The terminal device 1 may be referred to as a mobile station device, a user terminal (UE: User Equipment), a communication terminal, a mobile device, a terminal, an MS (Mobile Station), or the like. The base station apparatus 3 includes a radio base station apparatus, a base station, a radio base station, a fixed station, an NB (Node B), an eNB (evolved Node B), an NR NB (NR Node B), a gNB (next generation Node B), It may be called an access point, BTS (Base Transceiver Station), BS (Base Station), or the like. The base station device 3 may include a core network device. In addition, the base station apparatus 3 may include one or a plurality of transmission / reception points 4 (transmission reception points: TRP). The base station apparatus 3 may serve the terminal apparatus 1 by setting the communicable range (communication area) controlled by the base station apparatus 3 as one or a plurality of cells. Moreover, the base station apparatus 3 may serve the terminal apparatus 1 by setting the communicable range (communication area) controlled by the one or more transmission / reception points 4 as one or more cells. Also, one cell may be divided into a plurality of partial areas, and the terminal device 1 may be served in each partial area. Here, the partial region may be identified based on a precoding index.

  The communication area covered by the base station device 3 may have a different size and a different shape for each frequency. Moreover, the area to cover may differ for every frequency. A wireless network in which cells having different types of base station apparatuses 3 and different cell radii are mixed at the same frequency or different frequencies to form one communication system is referred to as a heterogeneous network.

  A wireless communication link from the base station device 3 to the terminal device 1 is referred to as a downlink. A wireless communication link from the terminal device 1 to the base station device 3 is referred to as an uplink. A wireless communication link from the terminal device 1 to another terminal device 1 is referred to as a side link.

In FIG. 1, in wireless communication between the terminal device 1 and the base station device 3 and / or wireless communication between the terminal device 1 and another terminal device 1, a cyclic prefix (CP: Cyclic Prefix) is used.
) Including Orthogonal Frequency Division Multiplexing (OFDM), Single-Carrier Frequency Division Multiplexing (SC-FDM), Discrete Fourier Transform Spread OFDM (DFT-S-OFDM) Multi-Carrier Code Division Multiplexing (MC-CDM) may be used.

In FIG. 1, in wireless communication between the terminal device 1 and the base station device 3 and / or wireless communication between the terminal device 1 and another terminal device 1, a universal filter multicarrier (UFMC) is used. Carrier), Filtered OFDM (F-OFDM)
Further, OFDM with a window multiplied (Windowed OFDM) or Filter-Bank Multi-Carrier (FBMC) may be used.

  In this embodiment, OFDM is described as an OFDM transmission system, but the case of using the other transmission systems described above is also included in the present invention.

  Further, in FIG. 1, in wireless communication between the terminal device 1 and the base station device 3 and / or wireless communication between the terminal device 1 and another terminal device 1, CP is not used or zero padding is used instead of CP. The above-described transmission method may be used. Further, CP and zero padding may be added to both the front and rear.

In FIG. 1, in wireless communication between the terminal device 1 and the base station device 3 and / or wireless communication between the terminal device 1 and another terminal device 1, a cyclic prefix (CP: Cyclic Prefix) is used.
) Including Orthogonal Frequency Division Multiplexing (OFDM), Single-Carrier Frequency Division Multiplexing (SC-FDM), Discrete Fourier Transform Spread OFDM (DFT-S-OFDM) Multi-Carrier Code Division Multiplexing (MC-CDM) may be used.

In the present embodiment, one or more serving cells are set for the terminal device 1. The plurality of configured serving cells include one primary cell and one or more secondary cells. The primary cell establishes an initial connection.
a serving cell in which an establishment procedure has been performed, a serving cell that has initiated a connection re-establishment procedure, or a cell designated as a primary cell in a handover procedure. One or a plurality of secondary cells may be set when an RRC (Radio Resource Control) connection is established or later.

TDD (Time Division Duplex) and / or FDD (Frequency Division Duplex) may be applied to the wireless communication system of the present embodiment. TD for all of multiple cells
A D (Time Division Duplex) method or an FDD (Frequency Division Duplex) method may be applied. In addition, cells to which the TDD scheme is applied and cells to which the FDD scheme is applied may be aggregated.

  In the downlink, a carrier corresponding to a serving cell is referred to as a downlink component carrier (or downlink carrier). In the uplink, a carrier corresponding to a serving cell is referred to as an uplink component carrier (or uplink carrier). In the side link, a carrier corresponding to the serving cell is referred to as a side link component carrier (or side link carrier). A downlink component carrier, an uplink component carrier, and / or a side link component carrier are collectively referred to as a component carrier (or carrier).

  In the present embodiment, the processing performed by the terminal device 1 and / or the base station device 3 for uplink beamforming is referred to as uplink precoding or precoding. In the present embodiment, the processing performed by the terminal device 1 and / or the base station device 3 for downlink beamforming is referred to as downlink precoding. Precoding may be referred to as a beam.

  The physical channel and physical signal of this embodiment will be described.

  In FIG. 1, the following physical channels are used in wireless communication between the terminal device 1 and the base station device 3. The physical channel is used to transmit information output from an upper layer.

・ PBCH (Physical Broadcast CHannel)
・ PCCH (Physical Control CHannel)
・ PSCH (Physical Shared CHannel)
・ PRACH (Physical Random Access CHannel)

The PBCH is used for the base station apparatus 3 to broadcast an important information block (MIB: Master Information Block) including important system information (Essential information) required by the terminal apparatus 1. Here, one or more important information blocks may be transmitted as an important information message. For example, the important information block may include information indicating a part or all of a frame number (SFN: System Frame Number) (for example, information on a position in a super frame composed of a plurality of frames). For example, a radio frame (10 ms) is composed of 10 subframes of 1 ms, and the radio frame is identified by a frame number. The frame number returns to 0 at 1024 (Wrap around). In addition, when a different important information block is transmitted for each region in the cell, information that can identify the region (for example, identifier information of transmission beams constituting the region) may be included. Here, the transmission beam identifier information may be indicated using a precoding index. In addition, when a different important information block (important information message) is transmitted for each region in the cell, the time position in the frame (for example, the subframe number including the important information block (important information message)) is identified. Possible information may be included. That is, information for determining each of the subframe numbers in which transmission of important information blocks (important information messages) using different precoding indexes is performed may be included. For example, the important information may include information necessary for connection to the cell and mobility.

In the case of uplink wireless communication (wireless communication from the terminal device 1 to the base station device 3), the PCCH is used to transmit uplink control information (UPCI). Here, the uplink control information may include channel state information (CSI: Channel State Information) used to indicate the state of the downlink channel. Further, the uplink control information may include a scheduling request (SR: Scheduling Request) used for requesting UL-SCH resources. Also, the uplink control information may include HARQ-ACK (Hybrid Automatic Repeat request ACKnowledgement). HARQ-ACK is downlink data (Transport block, Medium Access
HARQ-ACK for Control Protocol Data Unit (MAC PDU, Downlink-Shared Channel: DL-SCH) may be indicated.

Further, the PCCH is used for transmitting downlink control information (Downlink Control Information: DCI) in the case of downlink wireless communication (wireless communication from the base station apparatus 3 to the terminal apparatus 1). Here, one or a plurality of DCIs (which may be referred to as DCI formats) are defined for transmission of downlink control information. That is, the field for downlink control information is defined as DCI and mapped to information bits.

  For example, DCI including information indicating whether the signal included in the scheduled PSCH is downlink radio communication or uplink radio communication may be defined as DCI.

  For example, DCI including information indicating a downlink transmission period included in the scheduled PSCH may be defined as DCI.

  For example, DCI including information indicating an uplink transmission period included in the scheduled PSCH may be defined as DCI.

  For example, DCI including information indicating the timing of transmitting HARQ-ACK for the scheduled PSCH (for example, the number of symbols from the last symbol included in the PSCH to HARQ-ACK transmission) may be defined.

  For example, DCI including information indicating a downlink transmission period, a gap, and an uplink transmission period included in the scheduled PSCH may be defined as DCI.

  For example, DCI used for scheduling of one downlink radio communication PSCH (transmission of one downlink transport block) in one cell may be defined as DCI.

  For example, DCI used for scheduling of one uplink radio communication PSCH (transmission of one uplink transport block) in one cell may be defined as DCI.

Here, DCI includes information related to PSCH scheduling when the uplink or downlink is included in the PSCH. Here, the DCI for the downlink is defined as a downlink grant or a downlink assignment (downlink).
assignment). Here, the DCI for the uplink is also referred to as an uplink grant or an uplink assignment.

The PSCH is used for transmission of uplink data (UL-SCH: Uplink Shared CHannel) or downlink data (DL-SCH: Downlink Shared CHannel) from intermediate access (MAC). In the case of downlink, it is also used for transmission of system information (SI: System Information), random access response (RAR: Random Access Response) and the like. In the case of uplink, it may be used to transmit HARQ-ACK and / or CSI along with uplink data. Moreover, it may be used to transmit only CSI or only HARQ-ACK and CSI. That is, it may be used to transmit only UCI.

Here, the base station device 3 and the terminal device 1 exchange (transmit / receive) signals in a higher layer. For example, the base station device 3 and the terminal device 1 may perform RRC signaling (RRC message: Radio Resource Control) in a radio resource control (RRC) layer.
Control message, RRC information: also called Radio Resource Control information) may be transmitted and received. Further, the base station device 3 and the terminal device 1 may transmit and receive a MAC control element in a MAC (Medium Access Control) layer. Where R
RC signaling and / or MAC control elements are also referred to as higher layer signaling.

PSCH may be used to transmit RRC signaling and MAC control elements. Here, the RRC signaling transmitted from the base station apparatus 3 may be common signaling for a plurality of terminal apparatuses 1 in the cell. Further, the RRC signaling transmitted from the base station apparatus 3 may be dedicated signaling (also referred to as dedicated signaling) for a certain terminal apparatus 1. In other words, the terminal device specific (
The UE specific information may be transmitted to a certain terminal device 1 using dedicated signaling. The PSCH may be used for transmission of UE capability (UE Capability) in the uplink.

PCCH and PSCH use the same name for the downlink and uplink, but different channels may be defined for the downlink and uplink. For example, the PCCH for downlink may be defined as PDCCH (Physical Downlink Control CHannel), and the PCCH for uplink may be defined as PUCCH (Physical Uplink Control CHannel). For example, the downlink PSCH may be defined as PDSCH (Physical Downlink Shared CHannel), and the uplink PSCH may be defined as PUSCH (Physical Uplink Shared CHannel).

The PRACH may be used to transmit a random access preamble (random access message 1). The PRACH establishes an initial connection (initial
may be used to indicate a connection establishment procedure, a handover procedure, a connection re-establishment procedure, synchronization (timing adjustment) for uplink transmission, and uplink PSCH (UL-SCH) resource requirements Good.

In FIG. 1, the following downlink physical signals are used in downlink wireless communication. Here, the downlink physical signal is not used for transmitting information output from the upper layer, but is used by the physical layer.
・ Synchronization signal (SS)
・ Reference signal (RS)

  The synchronization signal may be used for the terminal device 1 to synchronize the downlink frequency domain and time domain. The synchronization signal may include PSS (Primary Synchronization Signal) and / or SSS (Second Synchronization Signal). The synchronization signal may be used by the terminal device 1 for precoding or beam selection in precoding or beamforming by the base station device 3. That is, the synchronization signal may be used by the terminal device to determine the precoding index or the beam index applied to the downlink signal by the base station device 3.

  A downlink reference signal (hereinafter also simply referred to as a reference signal) is mainly used by the terminal apparatus 1 to perform propagation channel compensation for a physical channel. That is, the downlink reference signal may include a demodulation reference signal. The downlink reference signal may also be used for the terminal device 1 to calculate downlink channel state information. That is, the downlink reference signal may include a channel state information reference signal. In addition, the downlink reference signal may be used for fine synchronization that allows numerology such as radio parameters and subcarrier spacing, FFT window synchronization, and the like.

  The downlink physical channel and the downlink physical signal may be collectively referred to as a downlink signal. Uplink physical channels and uplink physical signals may be collectively referred to as uplink signals.

  Hereinafter, subframes will be described. Although referred to as a subframe in this embodiment, it may be referred to as a resource unit, a radio frame, a time interval, a time interval, or the like.

FIG. 2 shows an example of a subframe (subframe type). In the figure, D indicates the downlink and U indicates the uplink. As shown in the figure, within a certain time interval (for example, the minimum time interval that must be allocated to one UE in the system),
One or more of a downlink part, a gap, and an uplink part may be included.

  FIG. 2 (a) is an example in which all are used for downlink transmission in a certain time interval (for example, the minimum unit of time resources that can be allocated to one UE), and FIG. 2 (b) is the first time resource. For example, uplink scheduling is performed via the PCCH, and the uplink signal is transmitted via a PCCH processing delay, a downlink to uplink switching time, and a gap for generating a transmission signal. FIG. 2 (c) is used for transmission of the downlink PCCH and / or downlink PSCH in the first time resource, via the processing delay, the downlink to uplink switching time, and the gap for transmission signal generation. Used for transmission of PSCH or PCCH. Here, as an example, the uplink signal may be used for transmission of HARQ-ACK and / or CSI, that is, UCI. FIG. 2 (d) is used for transmission of the downlink PCCH and / or downlink PSCH in the first time resource, via the processing delay, the downlink to uplink switching time, and the gap for transmission signal generation. Used for uplink PSCH and / or PCCH transmission. Here, as an example, the uplink signal may be used for transmission of uplink data, that is, UL-SCH. FIG. 2E shows an example in which all are used for uplink transmission (uplink PSCH or PCCH).

  The downlink part and uplink part described above may be composed of a plurality of OFDM symbols as in LTE.

  Here, the resource grid may be defined by a plurality of subcarriers and a plurality of OFDM symbols or SC-FDMA symbols. Further, the number of subcarriers constituting one slot may depend on the cell bandwidth. The number of OFDM symbols constituting one downlink part or uplink part may be 1 or 2 or more. Here, each of the elements in the resource grid is referred to as a resource element. The resource element may be identified using a subcarrier number and an OFDM symbol or an SC-FDMA symbol number.

  A random access procedure according to this embodiment will be described.

  Random access procedures are classified into two procedures: contention based and non-contention based.

  The contention-based random access procedure is performed at the time of initial access from a state in which the base station apparatus 3 is not connected (communication) and / or an uplink that is connected to the base station apparatus 3 but can be transmitted to the terminal apparatus 1 This is performed at the time of a scheduling request when data or transmittable side link data is generated.

  The occurrence of uplink data that can be transmitted to the terminal device 1 may include that a buffer status report corresponding to the uplink data that can be transmitted is triggered. The occurrence of uplink data that can be transmitted to the terminal device 1 may include that a scheduling request triggered based on the occurrence of uplink data that can be transmitted is pending.

  The occurrence of side link data that can be transmitted to the terminal device 1 may include that a buffer status report corresponding to the transmittable side link data is triggered. The occurrence of side link data that can be transmitted to the terminal device 1 may include that a scheduling request triggered based on the occurrence of the transmittable side link data is pending.

  The non-contention based random access procedure is a procedure used by the terminal device 1 instructed from the base station device 3, and the base station device 3 and the terminal device 1 are connected, but the handover timing or the transmission timing of the mobile station device Is used to quickly establish uplink synchronization between the terminal device 1 and the base station device 3.

  A contention based random access procedure in the present embodiment will be described.

The terminal device 1 of this embodiment receives random access setting information via an upper layer before starting a random access procedure (initiate). The random access setting information may include the following information.
One or more uplink precodings (beams) that can be used to transmit a random access preamble (eg, a set of available uplink precodings)
-Available PRACH resources (eg set of available PRACH resources)
One or more available random access preambles (eg, a set of available random access preambles)
・ Maximum number of preamble transmissions in each uplink precoding ・ Transmission power of the terminal device 1 in the serving cell performing the random access procedure ・ Random access response window size and contention resolution (contention resolution) timer (mac- ContentionResolutionTimer)
-Power ramping step-Maximum number of transmissions of preamble transmission-Initial transmission power of preamble-Power offset based on preamble format

  However, one or more uplink precoding that can be used to transmit the random access preamble may be indicated by an index (precoding index or uplink precoding index) corresponding to each precoding. However, for one or a plurality of available uplink precodings, the index of each uplink precoding may be indicated by a bitmap or the like, and the range of usable precoding indexes may be indicated. Good. However, the same processing can be performed even when other information is used without using an index to specify uplink precoding that can be used to transmit a random access preamble. Since one or a plurality of uplink precodings (beams) that can be used for transmitting the random access preamble can be set, not only one-to-one correspondence between downlink precoding and uplink precoding, but also one pair It becomes possible to correspond with a plurality. Thereby, the matching of the direction of the downstream and upstream beams becomes flexible.

  However, the terminal device 1 may receive one or more pieces of random access setting information and select one from the one or more pieces of random access setting information to perform a random access procedure. FIG. 3 is a flowchart showing an example of the operation of the terminal device 1 according to the present embodiment. The terminal device 1 receives a plurality of random access setting information (S301), and selects the random access setting information used for the random access setting used in the random access procedure from the received plurality of random access setting information (S301). S302). The terminal device 1 transmits a random access preamble based on the selected random access setting information (S303). FIG. 4 is a flowchart showing an example of the operation of the base station apparatus 3 according to the present embodiment. The base station apparatus 3 transmits a plurality of random access setting information (S401), and monitors a random access preamble transmitted based on each of the transmitted plurality of random access setting information (S402).

  However, the terminal device 1 uses one or more uplink precoding (one or more available for transmitting the random access preamble) that can be used to transmit the random access preamble to the selected random access setting information. One or a plurality of uplink precoding that can be used in a random access procedure. It is good also as coding. However, a plurality of pieces of information indicating one or a plurality of usable uplink precodings are included in one random access setting information, and a plurality of pieces of information indicating the one or a plurality of usable uplink precodings are included. One piece of information may be selected as one or a plurality of uplink precoding usable in the random access procedure.

  However, the terminal device 1 may receive a plurality of random access setting information in different cells. For example, the terminal device 1 includes: random access setting information received in a first cell configured by the base station device 3; and random access setting information received in a second cell configured by the same or different base station device 3. One random access setting information may be selected and a random access procedure may be performed.

  However, one or a plurality of random access setting information may be received from a base station device 3 different from the base station device 3 from which the terminal device 1 transmits a random access preamble. For example, the terminal device 1 randomly selects the second base station device 3 that forms the second cell based on at least one of the random access setting information received from the first base station device 3 that forms the first cell. An access preamble may be transmitted.

  However, the terminal device 1 may receive one or a plurality of pieces of random access setting information on a downlink carrier different from the downlink carrier corresponding to the uplink carrier that transmits the random access preamble. However, the terminal device 1 may receive the random access setting information in a serving cell different from the serving cell that transmits the random access preamble. Thereby, for example, even when beam sweeping is applied to a downlink carrier and an uplink carrier corresponding to an uplink carrier that transmits a random access preamble, the terminal apparatus 1 applies in advance to each beam direction. The random access setting information to be obtained is acquired, and the terminal device 1 can select one random access setting information corresponding to the optimum beam. Therefore, as one example, the terminal device 1 obtains one random access setting information from one or a plurality of random access setting information based on the measurement on the downlink carrier corresponding to the uplink carrier that transmits the random access preamble. You may choose.

  However, one or a plurality of available PRACH resources may be set independently for each available uplink precoding. However, one or a plurality of available random access preambles may be set independently for each available uplink precoding. For example, a random access preamble group may be set for each uplink precoding, and an index of a usable random access preamble may be set for each random access preamble group. However, the maximum number of preamble transmissions in each uplink precoding may be set to a value common to all available uplink precodings.

FIG. 5 is a conceptual diagram illustrating an example of uplink precoding that can be used by the terminal device 1 to transmit a random access preamble to the base station device 3. The terminal device 1, the beam p1 uplink precoding is used precoding index is I _p1, precoding indices beam uplink precoding is used is I _p2 p2, precoding index in I _p3 The random access preamble is transmitted using either the beam p3 using a certain uplink precoding or the beam p4 using the uplink precoding whose precoding index is _Ip4 .

However, when the available uplink precoding is set by the random access setting information, the terminal device 1 transmits the random access preamble using any one of the set uplink precoding. For example, when the available uplink precoding indexes indicated in the received random access setting information are I _p1 and I _p2 , the terminal device 1 is in uplink corresponding to any of the indexes of I _p1 and I _p2 A random access preamble is transmitted using link precoding.

  However, the terminal device 1 may receive a plurality of independent random access setting information from the base station device 3. For example, the terminal device 1 may receive independent random access setting information for each downlink precoding applied to the downlink signal that receives the random access setting information.

FIG. 6 is a diagram illustrating a case where the terminal apparatus 1 receives a downlink signal using a beam to which any of a plurality of different downlink precodings is applied by the base station apparatus 3. The base station device 3, the precoding index downlink beams b1 precoding is used, the downlink precoding beam b2, and / or precoding index was used, which is a precoding index I _b2 which is I _b1 there transmits downlink signals to the terminal device 3 by using a beam b3 used is downlink precoding is I _b3. However, a plurality of downlink signals using the beams b1, b2, and / or b3 may be transmitted at overlapping times or may be transmitted at different times.

FIG. 7 is a diagram illustrating an example of a relationship between a beam used in a downlink signal that has received random access setting information and an available uplink precoding index indicated in the random access setting information. The random access setting information received by the beam b1 indicates that the uplink precoding indexes that can be used for transmission of the random access preamble are I _p1 and I _p2 . The random access setting information received by the beam b2 indicates that the uplink precoding indexes that can be used for transmission of the random access preamble are I _p2 and I _p3 . The random access setting information received by the beam b3 indicates that the uplink precoding indexes that can be used for transmission of the random access preamble are I _p3 and I _p4 . The terminal device 1 transmits a random access preamble using any of the available uplink precoding indicated in the received random access setting information.

However, when receiving a plurality of pieces of random access setting information, the terminal device 1 may transmit a random access preamble based on the plurality of pieces of random access setting information. For example, when the terminal device 1 receives the random access setting information by the beam b1 and the beam b2 in FIG. 6 and each shows an available uplink precoding index as shown in the example of FIG. 7, the terminal device 1 1 may use available uplink precoding indexes as I _p1 , I _p2 , and I _p3 .

  As one or a plurality of available PRACH resources included in the random access configuration information, a subframe number, a system frame number, a symbol number, and an available uplink precoding that can transmit a random access preamble in each PRACH resource, And / or a preamble format may be set.

  FIG. 8 is an example of a table when subframe numbers that can be transmitted as a set of available PRACH resources are indicated in the random access setting information. FIG. 8 shows that 0, 1, 2, and 3 can be set as PRACH setting indexes, and subframe numbers i1, i2, i3, and i4 can be used, respectively. However, the subframe number that can be used in each PRACH configuration index may be one or more of the subframe numbers in the system frame. However, an available system frame number may be indicated for each PRACH configuration index. However, the available system frame number may indicate whether it is an odd number or an even number. However, an available preamble format may be indicated for each PRACH configuration index. However, an available symbol number may be indicated for each PRACH configuration index.

FIG. 9 shows a relationship between an uplink precoding index used for transmission of a random access preamble and a PRACH configuration index as an example of a set of PRACH resources indicated by the random access configuration information according to the present embodiment. The terminal device 1 receives random access setting information in which a PRACH setting index is individually set for each available uplink precoding index. In FIG. 9, an independent PRACH setting index is set for each uplink precoding index. Based on FIG. 8, a random access preamble is configured using subframes set independently for each uplink precoding index. May be sent.
However, although FIG. 9 shows the case where independent PRACH settings are set for each uplink precoding used for transmission of random access preambles, independent sets of PRACH resources are set for each uplink precoding by different means. May be. For example, settings corresponding to a plurality of uplink precodings may be individually defined for one PRACH setting. For example, when one PRACH setting is indicated for the random access setting information, the subframe in which the terminal device 1 transmits the random access preamble may be different depending on the uplink precoding used for transmitting the random access preamble. . FIG. 10 is a diagram illustrating an example of a relationship among a PRACH setting index, an uplink precoding index used for transmission of a random access preamble, and an index of an available subframe number. In Figure 10, when the PRACH configuration index is 0, the subframe number available for transmission of the random access preamble using the uplink precoding index is I _p1 is i _1, index in I _p2 This indicates that i ₂ is a subframe number that can be used for transmission of a random access preamble using a certain uplink precoding. Also, when the PRACH configuration index is 1, the subframe number that can be used for transmission of the random access preamble using the uplink precoding with the index of I _p1 is i ₃ and the index is I _p2 It indicates that subframe numbers available for transmission of the random access preamble using precoding is i _4.

  As shown in FIG. 11, the contention-based random access procedure is realized by transmitting and receiving four types of messages between the terminal device 1 and the base station device 3.

<Message 1 (S800)>
A terminal device 1 in which transmittable uplink data or transmittable side link data is generated, uses a physical random access channel (PRACH) for a random access preamble (random) to the base station device 3. (Referred to as an access preamble). This transmitted random access preamble is referred to as message 1 or Msg1. The random access preamble is configured to notify the base station apparatus 3 of information by a plurality of sequences. For example, when 64 types of sequences are prepared, 6-bit information can be indicated to the base station apparatus 3. This information is indicated as a random access preamble identifier. The preamble sequence is selected from a preamble sequence set that uses a preamble index. One selected random access preamble is transmitted with the transmission power P _PRACH in the designated PRACH resource.

<Message 2 (S801)>
The base station apparatus 3 that has received the random access preamble generates a random access response including an uplink grant for instructing the terminal apparatus 1 to transmit, and transmits the generated random access response to the terminal apparatus 1 using the downlink PSCH. To do. The random access response is referred to as message 2 or Msg2. Also, the base station apparatus 3 calculates a transmission timing shift between the terminal apparatus 1 and the base station apparatus 3 from the received random access preamble, and transmission timing adjustment information (Timing Advance Command) for adjusting the shift In message 2. Further, the base station device 3 includes a random access preamble identifier corresponding to the received random access preamble in the message 2. Further, the base station apparatus 3 uses a RA-RNTI (Random Access-Radio Network Temporary Identity) for indicating a random access response addressed to the terminal apparatus 1 that has transmitted the random access preamble, as a downlink PCCH. Send with. The RA-RNTI is determined according to the position information of the physical random access channel that has transmitted the random access preamble and / or the precoding index used for transmission of the random access preamble. Here, the message 2 (downlink PSCH) may include a precoding index used for transmission of the random access preamble. Further, information for determining precoding used for transmission of message 3 may be transmitted using downlink PCCH and / or message 2 (downlink PSCH). Here, the information for determining the precoding used for transmission of message 3 includes information indicating a difference (adjustment, correction) from the precoding index used for transmission of the random access preamble. Also good.

<Message 3 (S802)>
The terminal apparatus 1 that has transmitted the random access preamble has received a downlink PCCH for the random access response identified by the RA-RNTI within a plurality of subframe periods (referred to as RA response windows) after the transmission of the random access preamble. Monitoring. When the terminal device 1 that has transmitted the random access preamble detects the corresponding RA-RNTI, the terminal device 1 decodes the random access response arranged in the downlink PSCH. The terminal device 1 that has successfully decoded the random access response checks whether or not the random access response includes a random access preamble identifier corresponding to the transmitted random access preamble. When the random access preamble identifier is included, the synchronization shift is corrected using the transmission timing adjustment information indicated in the random access response. Further, the terminal device 1 transmits the data stored in the buffer to the base station device 3 using the uplink grant included in the received random access response. Data transmitted using the uplink grant at this time is referred to as message 3 or Msg3.

  In addition, when the random access response that has been successfully decoded is received for the first time in a series of random access procedures, the terminal device 1 receives information (C-) for identifying the terminal device 1 in the message 3 to be transmitted. RNTI) is transmitted to the base station apparatus 3.

<Message 4 (S803)>
When the base station apparatus 3 receives the uplink transmission with the resource allocated to the message 3 of the terminal apparatus 1 by the random access response, the base station apparatus 3 detects the C-RNTI MAC CE included in the received message 3. When establishing a connection with the terminal device 1, the base station device 3 transmits the PCCH to the detected C-RNTI. When transmitting the PCCH to the detected C-RNTI, the base station apparatus 3 includes an uplink grant in the PCCH. These PCCHs transmitted by the base station apparatus 3 are referred to as a message 4, Msg4 or a contention resolution message.

The terminal device 1 that has transmitted the message 3 starts a contention resolution timer that defines a period for monitoring the message 4 from the base station device 3, and receives the downlink PCCH transmitted from the base station within the timer. Try. C-RNTI with message 3
When the terminal device 1 that has transmitted the MAC CE receives the PCCH addressed to the transmitted C-RNTI from the base station device 3, and the uplink grant for new transmission is included in the PCCH, the other terminal device Assuming that the contention resolution with 1 is successful, the contention resolution timer is stopped and the random access procedure is terminated. If the reception of the PCCH addressed to the C-RNTI transmitted by the message 3 within the timer period cannot be confirmed, it is assumed that the contention resolution has not succeeded, and the terminal device 1 again receives the random access preamble. Send and continue the random access procedure. However, if transmission of the random access preamble is repeated a predetermined number of times and if the contention resolution is not successful, it is determined that there is a problem with random access, and the random access problem is instructed to the upper layer. For example, the upper layer may reset the MAC entity based on a random access problem. When the reset of the MAC entity is requested by the upper layer, the terminal device 1 stops the random access procedure.

  By transmitting / receiving the above four messages, the terminal device 1 can synchronize with the base station device 3 and perform uplink data transmission to the base station device 3.

  FIG. 12 is a flowchart showing an example of a random access preamble transmission process of the terminal device 1 according to the present embodiment. The terminal device 1 includes a first counter that counts the number of transmissions of the entire preamble transmission in one random access procedure, a second counter that counts the number of preamble transmissions per uplink precoding, and an uplink. A series of transmission processes may be performed using at least one counter among the third counters incremented for each change of precoding.

  The terminal device 1 performs initial setting when starting the random access procedure (S901). The terminal device 1 sets a counter (first counter, second counter and / or third counter) used for transmission processing to 1. In addition, the terminal device 1 can use one or more uplink precoding that can be used, one or more sets of PRACH resources that can be used, and a group of random access preambles based on the random access setting information notified by the higher layer. And one or a plurality of random access preambles that can be used in each group, the maximum number of preamble transmissions in one random access procedure, the maximum number of preamble transmissions in each uplink precoding, and a terminal in a serving cell performing the random access procedure Device 1 transmit power, random access response window size, contention resolution timer, power ramping step, maximum number of preamble transmissions, preamble initial transmit power, and / or It may set the power offset based on the preamble format.

  The terminal device 1 selects a resource for the random access preamble (S902). The terminal apparatus 1 may select one uplink precoding from one or a plurality of uplink precodings that can be used for random access preamble transmission based on a precoding selection rule described later. However, the terminal device 1 may select uplink precoding when a predetermined condition is satisfied. For example, the terminal device 1 may perform uplink precoding selection processing when the first counter reaches a predetermined number of times. For example, the terminal device 1 may perform uplink precoding selection processing when the second counter is 1. Also, the terminal device 1 selects a PRACH resource used for transmission of a random access preamble from a set of available PRACH resources. However, the PRACH resource may be set based on the selected uplink precoding. In addition, the terminal device 1 selects a group of random access preambles to be used. However, the terminal device 1 may set a group of random access preambles that can be used based on the selected uplink precoding. The terminal device 1 determines a subframe in which a random access preamble is transmitted based on information on the selected PRACH resource. However, the terminal device 1 may determine a subframe for transmitting a random access preamble from the selected uplink precoding and the selected PRACH resource. The terminal device 1 randomly selects one random access preamble from the selected group of random access preambles.

The terminal device 1 performs a random access preamble transmission process (S903). The terminal device 1 may set the transmission power of the random access preamble based on the initial transmission power of the preamble set in step S901, the power offset based on the preamble format, and the power ramping step. Further, the terminal device 1 may set the target received power P _TARGET of the random access preamble based on the first counter, the second counter, and / or the third counter. For example, the target received power P _TARGET may be set as “P _TARGET = initial transmission power of preamble + (first counter−1) * power ramping step + power offset based on preamble format”. For example, the target received power P _TARGET may be set as “P _TARGET = initial transmission power of preamble + (second counter −1) * power ramping step + power offset based on preamble format”. The terminal device 1 transmits a random access preamble using the selected PRACH resource, subframe, and target received power.

  Once the random access preamble is transmitted, the terminal device 1 performs a random access response reception process. The terminal device 1 monitors the downlink PCCH identified by RA-RNTI within the window of the random access response. When the terminal device 1 has successfully received a random access response including a random access preamble identifier corresponding to the transmitted random access preamble (S904-YES), the terminal device 1 stops monitoring the random access response, transmits the random access preamble, and performs random transmission. The access response reception process may be terminated.

  When the terminal device 1 does not receive the random access response within the window of the random access response, or when the received random access response does not include the random access preamble identifier corresponding to the transmitted random access preamble. (S904-NO), the following processing is performed on the assumption that the random access response has not been successfully received.

When the number of preamble transmissions reaches the set maximum number (YES in S905), the terminal device 1 performs random access preamble transmission and random access response reception processing on the assumption that the random access procedure has failed. finish. For example, the terminal device 1 increments the first counter by 1, and when the first counter becomes larger than the maximum number of transmissions of preamble transmission, which is information from the higher layer, the maximum number of preamble transmissions is set. It is considered that the number has been reached.
When the number of preamble transmissions has not reached the set maximum number (S905-NO), the terminal device 1 returns to step S902. However, the terminal device 1 may increase the second counter by 1 in the process of S905-NO. However, the terminal device 1 resets the second counter only when the second counter becomes larger than the maximum number of transmissions per uplink precoding, and the uplink used for transmission of the random access preamble in the subsequent step S902. Processing may be performed so as to change the precoding. However, the terminal device 3 may increase the third counter by 1 in the process of S905-NO. However, the terminal device 1 may reset the third counter and increment the second counter by 1 only when the third counter becomes larger than the number of available precodings.

  However, the RA-RNTI assigned to the PRACH that has transmitted the random accordible in the process of FIG. 12 may be calculated as the following equation.

RA-RNTI = 1 + t_id + 10 * f_id + 64 * b_id

  However, t_id is an index of the first subframe of the PRACH, f_id is an index in the frequency direction of the PRACH in the subframe, and b_id is an index of the selected uplink precoding. That is, RA-RNTI may be determined based on uplink precoding used for transmission of a random access preamble.

  A selection rule when the terminal device 1 according to the present embodiment receives a plurality of random access setting information and selects one random access setting information used for a random access procedure from the plurality of random access setting information will be described. .

  The terminal device 1 may select random access setting information used for the random access procedure based on the propagation path characteristics with the base station device 3. The terminal device 1 may select the random access setting information used for the random access procedure based on the propagation path characteristic measured by the downlink reference signal received from the base station device 3.

  The terminal device 1 may randomly select one random access setting information from the received plurality of random access setting information.

  The terminal device 1 may select one random access setting information from a plurality of received random access setting information based on the downlink signal received from the base station device 3. However, the downlink signal may be received from the base station apparatus 3 that is the transmission destination of the random access preamble, or may be received from a different base station apparatus 3. For example, the random access procedure with the second base station apparatus 3 that forms the second cell is the random access setting information selected based on the downlink signal from the first base station apparatus 3 that forms the first cell. You may use for.

  However, the above selection rule has been described as being applied to selection when one random access setting information is received when a plurality of random access setting information is received. May apply only to For example, when the terminal apparatus 1 according to the present embodiment receives a plurality of pieces of information indicating one or a plurality of uplink precodings that can be used for transmission of a random access preamble using one or a plurality of random access setting information, Similar rules may be used when selecting one piece of information from a plurality of pieces of information and specifying one or more uplink precodings that can be used.

  FIG. 13 is a flowchart showing processing related to the setting of uplink precoding of the terminal device 1 according to the present embodiment.

In step S1001 of FIG. 13, the terminal device 1 receives information specifying one or more precodings that can be used for transmission of the random access preamble. However, the information specifying one or more precodings that can be used for transmission of the random access preamble may be information included in the random access setting information. However, the information specifying one or more precodings that can be used for transmission of the random access preamble may be information indicating one or more uplink precoding indexes that can be used. However, the terminal device 1 relates to the PRACH resource corresponding to each of the available one or more precodings in addition to the information specifying one or more precodings available for transmission of the random access preamble. Information may be received. However, the information on the PRACH resource may be information on a time resource and / or a frequency resource that can be used when transmitting a random access preamble using corresponding precoding. However, the information on the available time resource may be information indicating an available symbol number, subframe number, and / or radio frame number. However, the information on the available frequency resources may be information indicating available subcarriers and / or resource blocks.

  In step S1002 in FIG. 13, the terminal apparatus 1 selects one uplink precoding from one or more available uplink precodings. An uplink precoding selection rule to be applied to transmission of a random assembler according to the present embodiment will be described.

The terminal device 1 according to the present embodiment may randomly select one uplink precoding from one or a plurality of available uplink precodings. For example, when the terminal device 1 is an uplink precoding index that can use I _p1 , I _p2, and I _{p3 according} to the received random access setting information, the terminal device 1 _{selects one} of I _p1 , I _p2, and I _p3. May be selected at random, and uplink precoding corresponding to the index may be used for transmission of the random access preamble. When uplink precoding is changed without receiving a random access response in the uplink precoding used in this case, the index is randomly selected from unused indexes among I _p1 , I _p2 and I _{p3 Alternatively} , it may be selected at random from I _p1 , I _p2 and I _p3 . However, any one of one or more available uplink precodings may be associated with one or more available random access preambles. In this case, uplink precoding associated with the selected random access preamble is selected by selecting one random access preamble from one or more random access preambles. That is, one random access preamble is associated with one preamble sequence and one uplink precoding among the available uplink precodings. However, the preamble sequence may be a sequence specified by one root sequence and one cyclic shift. For example, when uplink precoding with indexes 0 and 1 is available, and 64 preamble sequences are available for each uplink precoding index, the preamble index is 0 to 63. The terminal apparatus 1 uses a random access preamble using 0 uplink precoding, a preamble index 64 to 127 as a random access preamble using uplink precoding with an index 1, and the terminal apparatus 1 uses a random index with a preamble index 0 to 127. One of the access preambles may be selected at random and used.

The terminal device 1 according to the present embodiment may select one uplink precoding from one or more available uplink precodings based on a predetermined rule. For example, when the uplink precoding whose indexes are I _p1 , I _p2 and I _p3 can be used according to the received random access setting information, the terminal device 1 selects the one with the smallest index value, The selected uplink precoding may be used for transmission of a random access preamble. In this case, when the uplink precoding is changed without receiving the random access response corresponding to the transmitted random access preamble, the index is selected from the unused indexes among I _p1 , I _p2 and I _p3 . You may select the one with the smallest value. However, the selected uplink precoding index may be associated with the third counter. For example, uplink precoding selected for each value of the third counter may be determined.

The terminal device 1 according to the present embodiment is assigned to each uplink precoding when uplink precoding having indexes I _p1 , I _p2 and I _p3 is available according to the received random access setting information. Uplink precoding that can transmit a random access preamble in the earliest subframe of the PRACH resources may be used. In this case, when the uplink precoding is changed without receiving the random access response corresponding to the transmitted random access preamble, the index of the uplink precoding which is not used among I _p1 , I _p2 and I _p3 An index capable of transmitting a random access preamble may be selected from the list.

In the terminal device 1 according to the present embodiment, uplink precoding with indexes I _p1 (i), I _p2 (i), and I _p3 (i) can be used in the PRACH resource i according to the received random access setting information. If there is, the random access preamble is transmitted using the uplink precoding randomly selected from the uplink precoding of the PRACH resource i that can transmit the random access preamble in the earliest subframe among the plurality of PRACH resources i. May be. When the random access response corresponding to the transmitted random access preamble cannot be received, the PRACH resource i that can transmit the random access preamble in the earliest subframe among the plurality of PRACH resources i is randomly selected again from the uplink precoding. The selected uplink precoding may be used.

The terminal device 1 according to the present embodiment may select the uplink precoding used for transmission of the random access preamble based on the downlink precoding used for receiving the downlink signal from the base station device 3. For example, the terminal device 1 uses the downlink used for reception of the downlink signal when uplink precoding with indexes I _p1 , I _p2 and I _p3 is available according to the received random access setting information. Uplink pre-link associated with pre-coding (or downlink pre-coding determined to be the best by measurement of the downlink signal) (for example, the best transmission characteristic can be estimated from the downlink signal) Coding may be selected and used for transmission of a random access preamble. In this case, when the uplink precoding is changed without receiving the random access response corresponding to the transmitted random access preamble, the index of the uplink precoding which is not used among I _p1 , I _p2 and I _p3 You may select the thing which is estimated that the said transmission characteristic becomes the best from.

  In step S1003 of FIG. 13, the terminal device 1 transmits a random access preamble using the uplink precoding selected in step S1002.

  FIG. 14 is a flowchart showing processing relating to reception of a random access preamble of the base station apparatus 3 according to the present embodiment.

In step S1101 of FIG. 14, the base station apparatus 3 transmits information for specifying one or a plurality of uplink precoding that the terminal apparatus 1 can use for transmission of the random access preamble. Information for specifying one or a plurality of precodings that can be used by the terminal device 1 for transmission of the random access preamble is transmitted as part of random access setting information that the base station device 3 transmits to the terminal device 1. It's okay. However, in addition to information for specifying one or more uplink precodings that can be used by the terminal device 1 for transmission of the random access preamble, the base station device 3 uses the one or more uplinks that can be used. Information regarding PRACH resources corresponding to each of link precoding may be transmitted. However, the information on the PRACH resource may include information on a time resource and / or a frequency resource that can be used when transmitting a random access preamble using corresponding uplink precoding. However, the information on the available time resource may be information indicating an available symbol number, subframe number, and / or radio frame number. However, the information on the available frequency resources may be information indicating available subcarriers and / or resource blocks.

  In step S1102 of FIG. 14, the base station apparatus 3 uses one or more uplinks indicated by information for specifying one or more uplink precodings that can be used for transmission of the random access preamble transmitted in step S1101. A random access preamble to which one uplink precoding of the link precoding is applied is received from the terminal device 1. However, the base station apparatus 3 may receive the random access preamble only with the time resource and / or frequency resource indicated by the information regarding the PRACH resource transmitted to the terminal apparatus 1. However, the base station apparatus 3 may identify the uplink precoding used for transmission of the random access preamble based on the time resource and / or the frequency resource that received the random access preamble.

  In the terminal device 1 according to the present embodiment, an example of a random access preamble retransmission process when the terminal device 1 does not detect a random access response corresponding to a random access preamble transmitted using one uplink precoding. explain.

  FIG. 15 is a flowchart illustrating an example of a random access preamble retransmission process in the terminal device 1 according to the present embodiment. The terminal apparatus 1 selects one uplink precoding from one or a plurality of available uplink precodings (S1501), and transmits a random access preamble using the selected one uplink precoding to the base station apparatus 3 (S1502). The terminal device 1 monitors a random access response to one transmitted random access preamble. When the random access response is successfully received (YES in S1503), the terminal device 1 ends the random access preamble transmission process, and the random access response Is not successfully received (S1503-NO), the counter value is incremented (S1504). When the counter value exceeds a predetermined value when the counter value is incremented (S1505-YES), the terminal device 1 ends the random access preamble transmission process, and the counter value reaches the predetermined value. When not exceeding (S1505-NO), it returns to step S1501 and resends a random access preamble.

As an example of the random access preamble retransmission process, the terminal device 1 increments the first counter when no random access response corresponding to the transmitted random access preamble is detected in the set random access response window period. To do. When the incremented value of the first counter does not exceed the maximum number of times of transmission of the random access preamble set by the random access setting information, the random access preamble is retransmitted. However, the terminal device 1 may change the uplink precoding used for transmission of the random access preamble every time the first counter is incremented. However, the terminal device 1 may increase the value of the target received power P _TARGET used for transmission of the random access preamble every time the first counter is incremented a predetermined number of times. However, the terminal apparatus 1 may increase the value of the target received power P _TARGET when the random access preamble is transmitted using all of one or a plurality of uplink precoding available for transmission of the random access preamble. . However, the target received power P _TARGET is “P _TARGET = initial transmission power of random access preamble + Floor ((first counter-1) / number of available uplink precodings) * power based on ramping step + preamble format “Offset” may be set. However, Floor (X) represents the floor function of X.

As another example of the retransmission process of the random access preamble, the terminal device 1 receives the third counter when the random access response corresponding to the transmitted random access preamble is not detected in the set random access response window period. Is incremented. When the incremented value of the third counter does not exceed the number of uplink precoding available for transmission of the random access preamble, the uplink precoding used for transmission of the random access preamble is changed, and the random access Performs retransmission of preamble. The terminal device 1 increments the second counter and resets the third counter when the incremented third counter value exceeds the number of uplink precoding available for transmission of the random access preamble. To do. When the incremented second counter value does not exceed the maximum number of transmissions of the random access preamble per uplink precoding, the uplink precoding used for transmission of the random access preamble is changed, and the random access preamble Perform resend processing. However, the terminal device 1 may increase the value of the target reception power P _TARGET used for transmission of the random access preamble every time the second counter is incremented. However, the target received power P _TARGET may be set as “P _TARGET = initial transmission power of random access preamble + (second counter−1) * power ramping step + power offset based on preamble format”.

As another example of the retransmission process of the random access preamble, the terminal device 1 uses the second counter when the random access response corresponding to the transmitted random access preamble is not detected in the set random access response window period. Is incremented. The terminal device 1 does not change the uplink precoding used for transmission of the random access preamble when the incremented second counter value does not exceed the maximum number of transmissions of the random access preamble per uplink precoding. The random access preamble is retransmitted. When the value of the incremented second counter exceeds the maximum number of transmissions of the random access preamble per uplink precoding, the terminal device 1 resets the second counter and uses the uplink for transmission of the random access preamble Random access preamble retransmission processing is performed by changing link precoding. However, the terminal device 1 may increase the value of the target reception power P _TARGET used for transmission of the random access preamble every time the second counter is incremented. However, the target received power P _TARGET may be set as “P _TARGET = initial transmission power of random access preamble + (second counter−1) * power ramping step + power offset based on preamble format”.

  However, the terminal device 1 according to the present embodiment uses a plurality of uplink precodings among one or a plurality of uplink precodings that can be used for transmission of a random access preamble to generate a plurality of random access preambles. You may send it. For example, when the first uplink precoding and the second uplink precoding are available, the terminal device 1 uses the first random access preamble and the second preamble that use the first precoding. A second random access preamble using coding may be transmitted. However, when the time resource corresponding to the first uplink precoding is the first time resource and the time resource of the random access preamble corresponding to the second uplink precoding is the second time resource, the terminal The apparatus 1 may transmit a first random access preamble with a first time resource and transmit a second random access preamble with a second time resource.

The terminal device 1 that has transmitted a plurality of random access preambles monitors a random access response corresponding to each of the transmitted plurality of random access preambles. When none of the random access responses corresponding to each of the plurality of random access preambles transmitted in the set random access response window period can be detected, the terminal device 1 increments the second counter. When the incremented second counter value does not exceed the maximum number of random access preamble transmissions per uplink precoding, a random access preamble retransmission process is performed. However, the terminal device 1 may increase the value of the target reception power P _TARGET used for transmission of the random access preamble every time the second counter is incremented. However, the target received power P _TARGET may be set as “P _TARGET = initial transmission power of random access preamble + (second counter−1) * power ramping step + power offset based on preamble format”.

  Hereinafter, the configuration of the apparatus according to the present embodiment will be described.

FIG. 16 is a schematic block diagram illustrating a configuration of the terminal device 1 of the present embodiment. As illustrated, the terminal device 1 includes a wireless transmission / reception unit 10 and an upper layer processing unit 14. The wireless transmission / reception unit 10 includes an antenna unit 11, an RF (Radio Frequency) unit 12, and a baseband unit 13. The upper layer processing unit 14 includes a medium access control layer processing unit 15 and a radio resource control layer processing unit 16. The wireless transmission / reception unit 10 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit. The upper layer processing unit 14 is also referred to as a selection unit and a counter unit.

The upper layer processing unit 14 outputs uplink data (transport block) generated by a user operation or the like to the radio transmission / reception unit 10. The upper layer processing unit 14 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio). Resource Control (RRC) layer processing.

  The medium access control layer processing unit 15 included in the upper layer processing unit 14 performs processing of the medium access control layer.

  The radio resource control layer processing unit 16 included in the upper layer processing unit 14 performs processing of the radio resource control layer. The radio resource control layer processing unit 16 manages various setting information / parameters of the own device. The radio resource control layer processing unit 16 sets various setting information / parameters based on the upper layer signal received from the base station apparatus 3. That is, the radio resource control layer processing unit 16 sets various setting information / parameters based on information indicating various setting information / parameters received from the base station apparatus 3. The higher layer processing unit 14 selects the uplink precoding used for transmission of the random access preamble based on the information specifying a plurality of uplink precodings available for transmission of the random access preamble received from the base station apparatus 3 You may have the function to do. The upper layer processing unit 14 may have a function of selecting one random access setting information used in the random access procedure from a plurality of random access setting information received from the base station device 3. The upper layer processing unit 14 may have a function of incrementing the first counter, the second counter, and / or the third counter.

The wireless transmission / reception unit 10 performs physical layer processing such as modulation, demodulation, encoding, and decoding. The radio transmission / reception unit 10 separates, demodulates, and decodes the signal received from the base station apparatus 3 and outputs the decoded information to the upper layer processing unit 14. The wireless transmission / reception unit 10 receives random access setting information. The wireless transmission / reception unit 10 may have a function of receiving a plurality of pieces of random access setting information. The radio transmission / reception unit 10 generates a transmission signal by modulating and encoding data, and transmits the transmission signal to the base station apparatus 3. The radio transmission / reception unit 10 may have a function of transmitting a random access preamble to the base station apparatus 3 using the uplink precoding selected by the upper layer processing unit 14. The radio transmission / reception unit 10 may have a function of transmitting a random access preamble to the base station apparatus 3 based on the random access setting information selected by the upper layer processing unit 14.

The RF unit 12 converts the signal received via the antenna unit 11 into a baseband signal by orthogonal demodulation (down covert), and removes unnecessary frequency components. RF
The unit 12 outputs the processed analog signal to the baseband unit.

The baseband unit 13 converts the analog signal input from the RF unit 12 into a digital signal. The baseband unit 13 generates a CP (Cyclic) from the converted digital signal.
A portion corresponding to (Prefix) is removed, and Fast Fourier Transform (FFT) is performed on the signal from which CP is removed, and a frequency domain signal is extracted.

  The baseband unit 13 performs inverse fast Fourier transform (IFFT) on the data to generate an SC-FDMA symbol, adds a CP to the generated SC-FDMA symbol, and converts the baseband digital signal to Generate and convert baseband digital signals to analog signals. The baseband unit 13 outputs the converted analog signal to the RF unit 12.

  The RF unit 12 removes an extra frequency component from the analog signal input from the baseband unit 13 using a low-pass filter, up-converts the analog signal to a carrier frequency, and transmits it via the antenna unit 11. To do. The RF unit 12 amplifies power. Further, the RF unit 12 may have a function of controlling transmission power. The RF unit 12 is also referred to as a transmission power control unit.

  FIG. 17 is a schematic block diagram illustrating the configuration of the base station device 3 of the present embodiment. As shown in the figure, the base station apparatus 3 includes a radio transmission / reception unit 30 and an upper layer processing unit 34. The wireless transmission / reception unit 30 includes an antenna unit 31, an RF unit 32, and a baseband unit 33. The upper layer processing unit 34 includes a medium access control layer processing unit 35 and a radio resource control layer processing unit 36. The wireless transmission / reception unit 30 is also referred to as a transmission unit, a reception unit, or a physical layer processing unit.

  The upper layer processing unit 34 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (Radio). Resource Control (RRC) layer processing.

  The medium access control layer processing unit 35 provided in the upper layer processing unit 34 performs processing of the medium access control layer.

The radio resource control layer processing unit 36 included in the upper layer processing unit 34 performs processing of the radio resource control layer. The radio resource control layer processing unit 36 generates downlink data (transport block), system information, RRC message, MAC CE (Control Element), etc. arranged in the physical downlink shared channel, or acquires them from the upper node. , Output to the wireless transceiver 30. The radio resource control layer processing unit 36 manages various setting information / parameters of each terminal device 1. The radio resource control layer processing unit 36 may set various setting information / parameters for each terminal device 1 via an upper layer signal. That is, the radio resource control layer processing unit 36 transmits / notifies information indicating various setting information / parameters. That is, the radio resource control layer processing unit 36 transmits / broadcasts the random access setting information to each terminal device 1.

  Since the function of the wireless transmission / reception unit 30 is the same as that of the wireless transmission / reception unit 10, the description thereof is omitted. However, the wireless transmission / reception unit 30 may have a function of transmitting random access setting information. However, the radio transmission / reception unit 30 may have a function of transmitting information for specifying a plurality of uplink precoding available for transmission of the random access preamble. However, the wireless transmission / reception unit 30 may have a function of receiving a random access preamble.

  Each of the portions denoted by reference numerals 10 to 16 included in the terminal device 1 may be configured as a circuit. Each of the parts denoted by reference numerals 30 to 36 included in the base station device 3 may be configured as a circuit.

  Hereinafter, aspects of the terminal device 1 and the base station device 3 in the present invention will be described.

  (1) A first aspect of the present invention is a terminal apparatus 1 that specifies one or a plurality of precodings (also referred to as uplink precoding or beam) that can be used for transmission of a random access preamble. A receiving unit 10 that receives information, a selecting unit 14 that selects one precoding from the one or more precodings, and a transmitting unit 10 that transmits the random access preamble using the selected one precoding. And comprising.

  (2) In the first aspect of the present invention, the reception unit 10 receives information related to PRACH resources corresponding to each of the one or more precodings, and the selection unit 14 receives the one Alternatively, one PRACH resource corresponding to the selected one precoding is selected from among PRACH resources corresponding to each of a plurality of precoding, and the transmission unit 10 uses the selected one PRACH resource. The random access preamble is transmitted.

  (3) In the first aspect of the present invention, the receiving unit 10 receives information related to one PRACH resource, and the time resource used for transmitting the random access preamble is the selected one preamble. It is determined based on coding and the one PRACH resource.

  (4) In the first aspect of the present invention, the selection unit 14 randomly selects the one precoding from the one or more precodings.

  (5) In the first aspect of the present invention, the selection unit 14 selects the one precoding based on a predetermined rule from the one or more precodings.

  (6) In the first aspect of the present invention, the selection unit 14 performs the one precoding based on the received power of the signal received from the base station apparatus 3 based on the one or more precodings. select.

(7) The second aspect of the present invention is the terminal device 1, the receiving unit 10 receiving information specifying one or more random access preambles that can be used for transmission of the random access preamble, and the use A selection unit 14 that selects one random access preamble from one or more possible random access preambles, and each of the one or more random access preambles includes one preamble sequence and one precoding (uplink preamble). A transmitter 10 for transmitting the selected random access preamble using the one preamble sequence and the one precoding associated with the selected random access preamble. The Obtain.

  (8) In the second aspect of the present invention, the one preamble sequence is specified by one root sequence and one cyclic shift.

  (9) A third aspect of the present invention is the terminal device 1, which receives information related to a plurality of groups, and can be used in each of the plurality of groups (also referred to as preamble groups). Alternatively, the receiving unit 10 that receives information specifying a plurality of random access preambles, and each of the plurality of groups is one of one or more available precodings (also referred to as uplink precoding or beam). Selecting one group from the plurality of groups, and selecting one random access preamble from one or more available random access preambles included in the selected group. The selection unit 14 to be selected and the selection unit 14 associated with the selected group Was provided with a transmission unit 10 for transmitting one random access preamble said selected using the one preceding.

  (10) A fourth aspect of the present invention is a base station apparatus 3 that includes one or a plurality of precoding (also referred to as uplink precoding or beam) that can be used by the terminal apparatus 1 to transmit a random access preamble. And a receiving unit 30 for receiving the random access preamble transmitted using one of the available one or more precodings. And comprising.

  (11) In the fourth aspect of the present invention, the transmitter 30 transmits information related to PRACH resources corresponding to each of the one or more precodings, and the receiver 30 receives the one Alternatively, the PRACH resource corresponding to the one precoding among the PRACH resources corresponding to each of a plurality of precodings receives the random access preamble transmitted using the one precoding.

  (12) In the fourth aspect of the present invention, the transmitting unit 30 transmits information related to one PRACH resource, and the receiving unit 30 is based on the one precoding and the one PRACH resource. The random access preamble is received using a determined time resource.

  (13) The fifth aspect of the present invention is the base station device 3, and the terminal device 1 transmits information for specifying one or more random access preambles that can be used for transmission of the random access preamble. Each of the transmission unit 30 and the one or more random access preambles is associated with one preamble sequence and one precoding (also called uplink precoding or beam), and the one or more random access preambles A receiving unit 30 for receiving the one random access preamble transmitted using the one preamble sequence and the one precoding associated with one random access preamble of the asp preamble.

  (14) In the fifth aspect of the present invention, the one preamble sequence is specified by one root sequence and one cyclic shift.

(15) A sixth aspect of the present invention is the base station device 3, which transmits information on a plurality of groups, and the terminal device 1 includes one or more usable ones included in each of the plurality of groups. The transmitting unit 30 that transmits information for specifying a random access preamble, and each of the plurality of groups is one of one or more available precodings (also referred to as uplink precoding or beam). One or more available randoms included in the one group associated with one precoding and transmitted using the one precoding associated with one of the plurality of groups A receiving unit 30 for receiving a random access preamble of one of the access preambles; That.

  (16) The seventh aspect of the present invention is the terminal apparatus 1 that can select and use the first precoding from a plurality of available precodings (also referred to as uplink precoding or beam). A selection unit 14 that selects a first random access preamble from a plurality of random access preambles, and a transmission unit 10 that transmits the first random access preamble to the base station apparatus using the first precoding, A receiving unit 10 that monitors a random access response corresponding to the first random access preamble, and a counter unit 14 that increments a counter value when the random access response is not successfully received. The selector 14 selects the counter when the counter value is incremented. The second precoding is selected from the plurality of available precodings, and the second random access preamble is selected from the plurality of available random access preambles. The transmission unit 10 transmits the second random access preamble to the base station apparatus 3 using the second precoding.

  (17) In the seventh aspect of the present invention, the first power that is the target received power when transmitting the first random access preamble and the target received power that is used when transmitting the second random access preamble A power control unit 12 that sets certain second power is provided, and the first power and the second power are set based on the value of the counter.

  (18) In the seventh aspect of the present invention, when the incremented counter value is a predetermined value, the second power is set to a value larger than the first power.

  (19) The eighth aspect of the present invention is the terminal apparatus 1, wherein a plurality of random access preambles to which a plurality of different precodings (also referred to as uplink precoding or beam) are applied are assigned to the base station apparatus 3. Transmitter 10 for transmitting to, receiver 10 for monitoring the random access response corresponding to the plurality of transmitted random access preambles, and incrementing the counter value when the random access response is not successfully received And the counter unit 14 applies the plurality of precoding again if the counter value does not reach a predetermined value when the counter value is incremented by one. The plurality of random access preambles are transmitted to the base station apparatus 3.

  (20) In the eighth aspect of the present invention, the power control unit 12 sets target reception power when transmitting the plurality of random access preambles, and the target reception power is incremented by a value of the counter. Increased every time.

  (21) The ninth aspect of the present invention is the base station apparatus 3 for specifying one or a plurality of precoding (also referred to as uplink precoding or beam) that can be used by the terminal apparatus 1. A transmitting unit 30 that transmits the information of the above, and a receiving unit 30 that receives a random access preamble transmitted from the terminal device 1 using one of the one or a plurality of precodings, The transmitter 30 transmits the received random access preamble and a random access response corresponding to the one precoding.

(22) A tenth aspect of the present invention is a terminal device 1 that is used in a random access procedure from a receiving unit 10 that receives a plurality of random access setting information and the plurality of random access setting information. A selection unit 14 that selects one random access setting information, and a transmission unit 10 that transmits a random access preamble based on the selected one random access setting information.

  (23) In the tenth aspect of the present invention, the transmitting unit 10 transmits one or more precodings (uplinks) usable for transmitting the random access preamble to the selected one random access setting information. The random access preamble is transmitted using one of the available one or more precodings (also referred to as link precoding or beam).

  (24) In the tenth aspect of the present invention, the one random access setting information is selected based on a propagation path characteristic between the base station device 3 and the terminal device 1.

  (25) In the tenth aspect of the present invention, the one random access setting information is selected at random.

  (26) In the tenth aspect of the present invention, the plurality of random access setting information are received on a downlink carrier different from a downlink carrier corresponding to an uplink carrier used for transmission of the random access preamble.

  (27) An eleventh aspect of the present invention is the base station device 3, which is a transmission unit 30 that transmits a plurality of random access setting information to the terminal device 1, and the plurality of random access setting information from the terminal device. And a receiving unit 30 that receives a random access preamble transmitted based on one of the random access setting information.

  (28) In the eleventh aspect of the present invention, the receiving unit 30 includes one or a plurality of precoding (uplink preambles) usable for transmitting the random access preamble in the one random access setting information. The random access preamble transmitted from the terminal device 1 using one of the available ones or a plurality of precodings. Receive.

  (29) In the eleventh aspect of the present invention, the one random access setting information is selected based on propagation path characteristics between the base station apparatus 3 and the terminal apparatus 1.

  (30) In the eleventh aspect of the present invention, the one random access setting information is randomly selected by the terminal device 1.

  (31) In the eleventh aspect of the present invention, the plurality of random access setting information are transmitted on a downlink carrier different from a downlink carrier corresponding to an uplink carrier used for transmission of the random access preamble.

  The program that operates in the apparatus related to the present invention may be a program that controls a central processing unit (CPU) or the like to function a computer so as to realize the functions of the embodiments related to the present invention. The program or information handled by the program is temporarily stored in a volatile memory such as a Random Access Memory (RAM), a nonvolatile memory such as a flash memory, a Hard Disk Drive (HDD), or other storage device system.

  A program for realizing the functions of the embodiments according to the present invention may be recorded on a computer-readable recording medium. You may implement | achieve by making a computer system read the program recorded on this recording medium, and executing it. The “computer system” here is a computer system built in the apparatus, and includes hardware such as an operating system and peripheral devices. The “computer-readable recording medium” refers to a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a medium that dynamically holds a program for a short time, or other recording medium that can be read by a computer. Also good.

  In addition, each functional block or various features of the apparatus used in the above-described embodiments can be implemented or executed by an electric circuit, for example, an integrated circuit or a plurality of integrated circuits. Electrical circuits designed to perform the functions described herein can be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or others Programmable logic devices, discrete gate or transistor logic, discrete hardware components, or a combination thereof. A general purpose processor may be a microprocessor or a conventional processor, controller, microcontroller, or state machine. The electric circuit described above may be configured by a digital circuit or an analog circuit. In addition, in the case where an integrated circuit technology that replaces the current integrated circuit appears due to progress in semiconductor technology, one or more aspects of the present invention can use a new integrated circuit based on the technology.

  In addition, this invention is not limited to the above-mentioned embodiment. In the embodiment, an example of an apparatus has been described. However, the present invention is not limited to this, and a stationary or non-movable electronic device installed indoors or outdoors, such as an AV device, a kitchen device, It can be applied to terminal devices or communication devices such as cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other daily life equipment.

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

1 (1A, 1B) Terminal equipment 3 Base station equipment 4 Transmission / reception point (TRP)
DESCRIPTION OF SYMBOLS 10 Radio transmission / reception part 11 Antenna part 12 RF part 13 Baseband part 14 Upper layer processing part 15 Medium access control layer processing part 16 Radio resource control layer processing part 30 Wireless transmission / reception part 31 Antenna part 32 RF part 33 Baseband part 34 Upper layer Processing unit 35 Medium access control layer processing unit 36 Radio resource control layer processing unit

Claims (30)

A terminal device,
A receiver that receives information identifying one or more precodings available for transmission of a random access preamble;
A selection unit for selecting one precoding from the one or more precodings;
A transmitter for transmitting the random access preamble using the selected one precoding;
A terminal device comprising: The receiving unit receives information related to a PRACH resource corresponding to each of the one or more precodings;
The selection unit selects one PRACH resource corresponding to the selected one precoding from PRACH resources corresponding to each of the one or more precodings,
The terminal apparatus according to claim 1, wherein the transmission section transmits the random access preamble using the selected one PRACH resource. The receiving unit receives information related to one PRACH resource,
The terminal apparatus according to claim 1, wherein a time resource used for transmission of the random access preamble is determined based on the selected one precoding and the one PRACH resource. The selection unit includes:
The terminal apparatus according to claim 1, wherein the one precoding is randomly selected from the one or more precodings. The selection unit includes:
The terminal apparatus according to claim 1, wherein the one precoding is selected based on a predetermined rule from the one or more precodings. The selection unit includes:
The terminal apparatus according to claim 1, wherein the one precoding is selected from the one or more precodings based on reception power of a signal received from a base station apparatus. A terminal device,
A receiver that receives information identifying one or more random access preambles available for transmission of the random access preamble;
A selector for selecting one random access preamble from the one or more available random access preambles;
Each of the one or more random access preambles is associated with one preamble sequence and one precoding;
A transmitter that transmits the selected random access preamble using the one preamble sequence and the one precoding associated with the selected random access preamble;
A terminal device comprising: The terminal device according to claim 7, wherein the one preamble sequence is specified by one root sequence and one cyclic shift. A terminal device,
Receive information about multiple groups,
A receiver for receiving information identifying one or more available random access preambles included in each of the plurality of groups;
Each of the plurality of groups is associated with one of one or more available precodings;
Selecting one group from the plurality of groups;
A selection unit that selects one random access preamble from among one or more available random access preambles included in the selected group;
A transmitter that transmits the selected one random access preamble using the one precoding associated with the selected group;
A terminal device comprising: A base station device,
A transmission unit that transmits information for identifying one or more precodings that can be used by the terminal device to transmit a random access preamble;
A receiver for receiving the random access preamble transmitted using one of the available one or more precodings;
A base station apparatus comprising: The transmitter transmits information related to the PRACH resource corresponding to each of the one or more precodings;
The reception unit transmits the random access preamble transmitted using the one precoding in the PRACH resource corresponding to the one precoding among the PRACH resources corresponding to each of the one or a plurality of precodings. The base station apparatus according to claim 10. The transmitter transmits information related to one PRACH resource,
The base station apparatus according to claim 10, wherein the reception unit receives the random access preamble using a time resource determined based on the one precoding and the one PRACH resource. A base station device,
A transmission unit that transmits information for specifying one or more random access preambles that can be used by the terminal device to transmit the random access preamble;
Each of the one or more random access preambles is associated with one preamble sequence and one precoding;
A receiving unit configured to receive the one random access preamble transmitted using the one preamble sequence and the one precoding associated with one random access preamble of the one or more random access preambles; and ,
A base station apparatus comprising: The base station apparatus according to claim 13, wherein the one preamble sequence is specified by one root sequence and one cyclic shift. (Associate precoding with preamble group)
A base station device,
Send information about multiple groups,
A transmitting unit that transmits information for identifying one or more available random access preambles included in each of the plurality of groups by the terminal device;
Each of the plurality of groups is associated with one of one or more available precodings;
One random of one or more available random access preambles included in the one group transmitted using the one precoding associated with one group of the plurality of groups A receiving unit for receiving an access preamble;
A base station apparatus comprising: A communication method used for a terminal device,
Receiving information identifying one or more precodings available for transmission of a random access preamble;
Selecting one precoding from the one or more precodings;
A communication method for transmitting the random access preamble using the selected one precoding. Receiving information related to PRACH resources corresponding to each of the one or more precodings;
Selecting one PRACH resource corresponding to the selected one precoding from PRACH resources corresponding to each of the one or more precodings;
The communication method according to claim 16, wherein the random access preamble is transmitted using the selected one PRACH resource. Receiving information related to one PRACH resource;
The communication method according to claim 16, wherein a time resource used for transmitting the random access preamble is determined based on the selected one precoding and the one PRACH resource. The one precoding is:
The communication method according to claim 16, wherein the communication method is randomly selected from the one or more precodings. The one precoding is:
The communication method according to claim 16, wherein the communication method is selected based on a predetermined rule from the one or more precodings. The one precoding is:
The communication method according to claim 16, wherein the communication method is selected from the one or more precodings based on reception power of a signal received from a base station apparatus. A communication method used for a terminal device,
Receiving information identifying one or more random access preambles available for transmission of the random access preamble;
Selecting a random access preamble from the one or more available random access preambles;
Each of the one or more random access preambles is associated with one preamble sequence and one precoding;
A communication method for transmitting the selected random access preamble using the one preamble sequence and the one precoding associated with the selected random access preamble. The communication method according to claim 22, wherein the one preamble sequence is specified by one root sequence and one cyclic shift. A communication method used for a terminal device,
Receive information about multiple groups,
Receiving information identifying one or more available random access preambles included in each of the plurality of groups;
Each of the plurality of groups is associated with one of one or more available precodings;
Selecting one group from the plurality of groups;
Selecting one random access preamble from one or more available random access preambles included in the selected group;
A communication method for transmitting the selected one random access preamble using the one precoding associated with the selected group. A communication method used in a base station device,
Transmitting information for identifying one or a plurality of precoding available for transmission of a random access preamble by a terminal device;
A communication method for receiving the random access preamble transmitted using one of the available one or more precodings. Transmitting information related to PRACH resources corresponding to each of the one or more precodings;
The random access preamble transmitted using the one precoding is received in the PRACH resource corresponding to the one precoding among the PRACH resources corresponding to each of the one or more precodings. 25. The communication method according to 25. Send information related to one PRACH resource;
The communication method according to claim 25, wherein the random access preamble is received by a time resource determined based on the one precoding and the one PRACH resource. A communication method used in a base station device,
Transmitting information for identifying one or more random access preambles that can be used by the terminal device to transmit the random access preamble;
Each of the one or more random access preambles is associated with one preamble sequence and one precoding;
A communication method for receiving the one random access preamble transmitted using the one preamble sequence and the one precoding associated with one random access preamble of the one or a plurality of random access preambles. The communication method according to claim 28, wherein the one preamble sequence is specified by one root sequence and one cyclic shift. A communication method used in a base station device,
Send information about multiple groups,
A terminal device transmits information for identifying one or more available random access preambles included in each of the plurality of groups;
Each of the plurality of groups is associated with one of one or more available precodings;
One random of one or more available random access preambles included in the one group transmitted using the one precoding associated with one group of the plurality of groups A communication method for receiving an access preamble.

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