WO2019159294A1 - User device and base station device - Google Patents

Abstract

This user device has: a first transmission unit that carries out communication with a base station device and transmits a random access preamble to the base station device; a reception unit that receives a response to the random access preamble from the base station device; a second transmission unit that transmits data to the base station device on the basis of information which is for instructing transmission of data and which is included in the response to the random access preamble; and a control unit that selects, on the basis of a prescribed condition, the random access preamble transmitted from the first transmission unit.

Description

User apparatus and base station apparatus

The present invention relates to a user apparatus and a base station apparatus in a wireless communication system.

In 3GPP (3rd Generation Partnership Project), NB-IoT (Narrow Band-Internet of Things) that suppresses throughput, reduces terminal cost due to modem complexity reduction, and achieves extremely low power consumption (for example, non-patent) Reference 1). In NB-IoT, for example, a technique of repeatedly transmitting a signal while limiting the bandwidth to 200 kHz or less is employed, and an increase in coverage is realized (for example, Non-Patent Document 2).

In operation of BL / CE UE (Bandwidth-reduced Low-complexity Coverage Enhanced User Equipment) that is an NB-IoT terminal or a category M terminal, the user equipment receives information necessary for initial access from the base station equipment, and randomly Access. Information necessary for the initial access includes information for specifying a RACH (Random Access Channel) resource and a preamble signal format. Further, uplink communication is mainly used from user apparatuses that are NB-IoT terminals or category M terminals. Therefore, EDT (Early Data Transmission), which is a technique for starting uplink data transmission from a user apparatus at an early stage, has been studied. With the EDT, the user apparatus can transmit uplink data to the base station apparatus using the RACH message 3 in the initial access procedure.

3GPP TS 36.211 V14.5.0 (2017-12) 3GPP TS 36.213 V14.5.0 (2017-12)

When performing initial access from the user apparatus to the base station apparatus in the initial access for performing EDT, there is a concern that resources used for the initial access may not be efficiently allocated.

The present invention has been made in view of the above points, and an object of the present invention is to efficiently use resources related to initial access when performing initial access to which EDT is applied from a user apparatus to a base station apparatus.

According to the disclosed technology, a user apparatus that communicates with a base station apparatus, a first transmission unit that transmits a random access preamble to the base station apparatus, and a response of the random access preamble from the base station apparatus A receiving unit for receiving, a second transmitting unit for transmitting data to the base station apparatus based on information instructing data transmission included in the response of the random access preamble, and the first based on a predetermined condition And a control unit that selects the random access preamble transmitted by the transmitting unit.

According to the disclosed technology, when performing an initial access in which EDT is applied from a user apparatus to a base station apparatus, it is possible to efficiently use resources related to the initial access.

It is a figure for demonstrating the communication system in embodiment of this invention. It is a sequence diagram for demonstrating the example of an initial access procedure. It is a figure which shows the structural example of a RACH preamble. It is a sequence diagram for demonstrating the example of the initial access procedure in embodiment of this invention. It is a figure which shows the structural example of the RACH preamble in embodiment of this invention. It is a figure which shows an example of a function structure of the base station apparatus 100 in embodiment of this invention. It is a figure which shows an example of a function structure of the user apparatus 200 in embodiment of this invention. It is a figure which shows an example of the hardware constitutions of the base station apparatus 100 or the user apparatus 200 in embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The embodiment described below is an example, and the embodiment to which the present invention is applied is not limited to the following embodiment.

In the operation of the wireless communication system according to the embodiment of the present invention, existing technologies are used as appropriate. However, the existing technology is, for example, existing LTE, but is not limited to existing LTE. Further, unless otherwise specified, the term “LTE” used in the present specification has a broad meaning including LTE-Advanced and LTE-Advanced and subsequent schemes (eg, NR).

In the embodiments described below, SS (SynchronizationchronSignal), PSS (Primary SS), SSS (Secondary SS), PBCH (Physical broadcast channel), PRACH (Physical RACH), etc. used in the existing LTE are used. The terminology is used. This is for convenience of description, and signals, functions, and the like similar to these may be referred to by other names.

In the embodiment of the present invention, the Duplex method may be a TDD (Time Division Division Duplex) method, an FDD (Frequency Division Duplex) method, or other (for example, Flexible Duplex). This method may be used. In the following description, transmitting a signal using a transmission beam may be transmitting a signal multiplied by a precoding vector (precoded with a precoding vector). Similarly, receiving a signal using a receive beam may be multiplying the received signal by a predetermined weight vector. Further, transmitting a signal using a transmission beam may be expressed as transmitting a signal through a specific antenna port. Similarly, receiving a signal using a receive beam may be expressed as receiving a signal at a specific antenna port. An antenna port refers to a logical antenna port or a physical antenna port defined in the 3GPP standard. Note that the method of forming the transmission beam and the reception beam is not limited to the above method. For example, in base station apparatus 100 or user apparatus 200 having a plurality of antennas, a method of changing the angle of each antenna may be used, or a method of combining a method of using a precoding vector and a method of changing the angle of an antenna is used. Alternatively, different antenna panels may be switched and used, or a method of combining a plurality of antenna panels may be used, or other methods may be used. Further, for example, a plurality of different transmission beams may be used in the high frequency band. The use of multiple transmission beams is called multi-beam operation, and the use of one transmission beam is called single beam operation.

FIG. 1 is a diagram for explaining a communication system according to an embodiment of the present invention. The radio | wireless communications system in embodiment of this invention contains the base station apparatus 100 and the user apparatus 200 as FIG. 1 shows. Although one base station apparatus 100 and one user apparatus 200 are shown in FIG. 1, this is an example, and there may be a plurality of each.

The base station apparatus 100 is a communication apparatus that provides one or more cells and performs wireless communication with the user apparatus 200. As illustrated in FIG. 1, the base station apparatus 100 transmits a synchronization signal and system information to the user apparatus 200. The synchronization signal is, for example, PSS and SSS. System information is transmitted, for example, by PBCH. The system information is also called notification information. Both the base station apparatus 100 and the user apparatus 200 can transmit and receive signals to which beamforming is applied. The user apparatus 200 is a communication module compatible with NB-IoT or category M, and has wireless communication functions such as a smartphone, a mobile phone, a tablet, a wearable terminal, and a communication module for M2M (Machine-to-Machine). It may be a communication device. The user apparatus 200 is wirelessly connected to the base station apparatus 100 and uses various communication services provided by the wireless communication system. In the initial access stage, as shown in FIG. 1, the user apparatus 200 transmits a random access preamble signal to the base station apparatus 100. The random access is performed based on the system information by PDSCH (Physical downlink shared channel) in addition to the system information by PBCH received from the base station apparatus 100. Also, the user apparatus 200 performs UL transmission based on UL (Uplink) scheduling received from the base station apparatus.

(Example)
Examples will be described below. The user apparatus 200 in the embodiment is an NB-IoT terminal or a category M terminal. “IoT terminal” in the embodiment indicates an NB-IoT terminal or a category M terminal.

FIG. 2 is a diagram for explaining an example of the initial access procedure. FIG. 2 is a diagram illustrating an example of an initial access sequence. The eNB, that is, the base station apparatus 100 transmits PSS, SSS, and PBCH to the UE, that is, the user apparatus 200. The PBCH includes a part of system information.

The user apparatus 200 receives the PSS transmitted from the base station apparatus 100 and uses it at least for specifying the initial time and frequency synchronization and part of the cell ID (identity). Further, the user apparatus 200 receives the SSS transmitted from the base station apparatus 100 and uses it for specifying at least a part of the cell ID. Also, the user apparatus 200 receives the PBCH transmitted from the base station apparatus 100, and receives part of system information necessary for initial access, for example, a system frame number (SFN) and other system information. Acquire information for acquisition. The other system information may be received via the PDSCH, and includes information for specifying a resource for executing the random access procedure, that is, a RACH resource specified in the frequency domain and a time domain, a preamble format, and the like. It is.

In step S11 “RACH Preamble”, the user apparatus 200 transmits a preamble using the specified RACH resource and starts a random access procedure. The random access preamble transmitted from the user apparatus 200 in step S11 may be referred to as “message 1 (Msg1)”.

Subsequently, in step S12 “RACH Response”, the base station apparatus 100 transmits a random access response to the user apparatus 200. The random access response is a response to the random access preamble, and is transmitted to the RA-RNTI (Random Access-Radio Network Temporary Identifier) on the PDCCH, and at least the identifier of the random access preamble, timing alignment, initial uplink grant, and temporary C -Includes RNTI (Temporary Cell-Radio Network Temporary Identifier). The random access response transmitted from the base station apparatus 100 in step S12 may be referred to as “message 2 (Msg2)”.

Subsequently, in step S13 “RACH connection request”, the user apparatus 200 performs uplink transmission based on the uplink grant included in the random access response. In uplink transmission, at least a RRC (Radio Resource Control) connection request and a NAS (Non-Access Stratum) UE (User Equipment) identifier are transmitted. In NB-IoT, SRB (Signalling Resource Radio Bearer) or DRB of subsequent transmission is transmitted. A notification indicating the amount of data in (Data Radio Bearer) may be transmitted. The uplink transmission transmitted from the user apparatus 200 in step S13 may be referred to as “message 3 (Msg3)”.

Subsequently, in step S14 “RACH setup”, the base station apparatus 100 transmits the control information for establishing the RRC connection to the temporary C-RNTI on the PDCCH and the user apparatus 200 transmits it in step S13. A predetermined MAC (Medium Access Control) control element is transmitted. The MAC control element is used for contention resolution. The collision resolution is performed when the collision type random access procedure is executed, and may not be performed when the non-collision type random access procedure is executed. If the MAC control element matches part or all of the data transmitted in step S13, the user apparatus 200 considers that the random access has been successful and sets the temporary C-RNTI as C-RNTI.

Subsequently, in step S15 “RACH setup complete”, the user apparatus 200 transmits an RRC connection establishment completion message to the base station apparatus 100. Subsequently, the base station apparatus 100 transmits “UL Grant” indicating uplink transmission scheduling to the user apparatus 100 (S16). Subsequently, the user apparatus 100 transmits uplink data to the base station apparatus 200 using the PUSCH resource allocated by “UL Grant”.

FIG. 3 is a diagram illustrating a configuration example of the RACH preamble. As shown in FIG. 3, random access preambles transmitted on RACH are classified into collision-type RACH and non-collision-type RACH. The said classification | category may be classified in the range of the index which a random access preamble has.

In the collision type random access procedure in which the collision type RACH preamble is used as described with reference to FIG. 2, the same collision type random access preamble may be transmitted from a plurality of user apparatuses 200. Done. On the other hand, in the non-collision type random access procedure in which the non-collision type RACH preamble is used, since the non-collision type RACH preamble used for the initial access is designated by the user apparatus 200 from the network, the collision resolution is unnecessary. is there.

FIG. 4 is a diagram for explaining an example of an initial access procedure in the embodiment of the present invention. In FIG. 4, a random access procedure when EDT is performed will be described. EDT implements a low-delay technique, and aims to transmit uplink data transmission at an early stage, and allows uplink data transmission from the user apparatus 200 with the message 3 in the random access procedure.

In step S21 “broadcast information”, broadcast information included in the PBCH transmitted from the base station apparatus 100 is received, and a part of system information necessary for initial access, for example, a system frame number and other system information is acquired. To acquire information and so on. The other system information may be received via the PDSCH, and includes information specifying a resource for executing a random access procedure including a random access preamble. Here, resources used for random access for EDT are included in the broadcast information. When the user apparatus 200 is an EDT-compatible terminal, the user apparatus 200 acquires information related to the RACH resource including the EDT random access preamble. Note that the means for notifying the user apparatus 200 of the information related to the initial access from the base station apparatus 100 in step S21 is not limited to the broadcast information. For example, the means for notifying the user apparatus 200 of information related to the initial access from the base station apparatus 100 may be individual signaling or broadcast other than broadcast information.

In step S22 “RACH Preamble”, the user apparatus 200 transmits a preamble for EDT using the specified RACH resource and starts a random access procedure. The random access preamble transmitted from the user apparatus 200 in step S22 may be referred to as “message 1 (Msg1)”.

Subsequently, in step S23 “RACH Response + data transmission instruction”, the base station apparatus 100 transmits a random access response to the user apparatus 200. Here, in step S22, since the base station apparatus 100 has received the random access preamble for EDT, in addition to the random access response, the base station apparatus 100 also performs uplink data allocation. The random access response transmitted from the base station apparatus 100 in step S23 may be referred to as “message 2 (Msg2)”.

Subsequently, the user apparatus 100 transmits uplink data to the base station apparatus 200 using the PUSCH resource allocated by the “data transmission instruction” received in step S23.

As described above, in the random access procedure when EDT is performed, the user apparatus 200 can transmit uplink data to the base station apparatus 100 at the stage of message 3 in the random access procedure. That is, uplink data transmission can be started at an earlier stage than the random access procedure described in FIG.

FIG. 5 is a diagram showing a configuration example of the RACH preamble in the embodiment of the present invention. As shown in FIG. 5, random access preambles transmitted by RACH in a radio system corresponding to EDT are classified into collision-type RACH, EDT-type, and non-collision-type RACH. The said classification | category may be classified in the range of the index which a random access preamble has.

The collision-type RACH preamble and the non-collision-type RACH preamble are the same as the random access preamble described with reference to FIG. On the other hand, as described in FIG. 4, when the EDT preamble is transmitted from the user apparatus 200 to the base station apparatus 100, the base station apparatus 100 performs uplink in addition to the random access response in the message 2 stage. Also instruct data transmission.

Here, whether or not the user device 200 uses the EDT preamble depends on whether or not the user device 200 supports the EDT function. That is, if all user apparatuses 200 are compatible with the EDT function, the EDT preamble is used intensively, so there is a concern about delay in call connection due to preamble collision.

In addition, the IoT terminal transmits data to the network about once a day. Therefore, when a RACH resource including an EDT preamble is reserved for the user apparatus 200 that is an IoT terminal, the RACH resource cannot be used by another user apparatus 200. Therefore, the use efficiency of the RACH resource reserved in the IoT terminal is improved. descend.

Further, when the user apparatus 200 executing EDT transmits large data in step S24 shown in FIG. 4, there is a possibility that the user apparatus 200 does not communicate with the base station apparatus 100 depending on the communication environment.

Therefore, the user apparatus 200 may use the EDT RACH resource only when the amount of uplink data is large. That is, the user apparatus 200 determines whether or not to use the EDT RACH resource by measuring the uplink data retention amount of the own apparatus. When the uplink data retention amount is large, the user apparatus 200 performs a random access procedure using the EDT RACH resource.

The uplink data retention amount threshold used for determining whether or not to use the EDT RACH resource may be a predetermined value, for example, an uplink data retention amount threshold (number of bits) for EDT transmission using broadcast information. (For example, 500 bits) may be notified to the user apparatus 200. Here, for example, the threshold may be changed based on the number of IoT terminals connected to the cell or the base station apparatus 100. That is, when the number of IoT terminals is large, the uplink data retention amount threshold may be increased, and when the number of IoT terminals is small, the uplink data retention amount threshold may be decreased. That is, when the number of IoT terminals is small, EDT RACH resources may be concentrated and used.

Further, the user device 200 may use the EDT RACH resource when the communication quality is equal to or higher than a predetermined communication quality. That is, the user apparatus 200 measures the communication quality of the own apparatus and determines whether to use the EDT RACH resource. When the communication quality of the own device is equal to or higher than the predetermined communication quality, the user device 200 performs a random access procedure using the EDT RACH resource. For example, the communication quality may be determined based on the CE (Coverage Enhanced) level, and the user apparatus 200 having a high CE level may not use the EDT RACH resource. The CE level is a level indicating the degree to which the radio parameter is changed so that the user apparatus 200 can expand the corresponding coverage. For example, the CE level corresponds to the number of repeated transmissions. The communication quality may be determined by RSRP (Reference （Signals Received Power) or path loss.

The threshold value related to the predetermined communication quality used for determining whether to use the EDT RACH resource may be a predetermined value, for example, a CE level threshold value or an RSRP threshold value for EDT transmission using broadcast information May be notified to the user apparatus 200. Here, for example, the threshold may be changed based on the number of IoT terminals connected to the cell or the base station apparatus 100. That is, when the number of IoT terminals is large, the CE level threshold may be decreased or the RSRP threshold may be increased. When the number of IoT terminals is small, the CE level threshold may be increased or the RSRP threshold may be decreased. . That is, when the number of IoT terminals is small, EDT RACH resources may be concentrated and used.

Further, the user apparatus 200 may make the data size smaller when retransmitting the uplink data transmitted with the message 3 than when transmitting the initial data. For example, if the data size is 1000 bits at the time of EDT transmission and is not communicated at the time of initial transmission, the user apparatus 200 may reduce the data size at the time of retransmission to about several hundred bits. The base station apparatus 100 may specify the data size to the user apparatus 200 in the uplink data transmission instruction that is transmitted together with the random access response. Further, when the message 3 by EDT is not communicated, the user device 200 may transmit a normal message 3 that does not include data by EDT.

In addition, when the message 1 by EDT is not communicated, the user apparatus 200 may transmit the message 1 using a normal preamble that is not an EDT preamble. For example, when the transmission of the message 1 has failed a predetermined number of times, the next retransmission may be performed using a random access procedure using the non-EDT preamble and the non-EDT RACH resource. The predetermined number of times may be changed. That is, when the number of IoT terminals is large, the predetermined number of times may be decreased, and when the number of IoT terminals is small, the predetermined number of times may be increased. That is, when the number of IoT terminals is small, EDT RACH resources may be concentrated and used.

Further, when the message 3 by EDT is not communicated, the user apparatus 200 may perform a random access procedure from the message 1 using the non-EDT preamble and the non-EDT RACH resource for the next retransmission.

Information indicating whether or not to perform fallback to random access using the non-EDT preamble and non-EDT RACH resource when message 1 or message 3 by EDT is not communicated is broadcast information. 200 may be notified. Also, the base station apparatus 100 notifies the user apparatus 200 of information indicating whether or not to perform fallback to random access using the non-EDT preamble and the non-EDT RACH resource, included in the random access response. Also good.

The above-described embodiment is a technique that can be applied to a random access response that transmits the message 3 in the random access procedure. Therefore, the present invention is not limited to outgoing / incoming calls, and can be applied to any random access procedure such as a random access response by a handover or a scheduling trigger.

According to the above-described embodiment, the user apparatus 200 determines whether to use the EDT RACH resource according to the data amount, communication quality, or the like, and thus smoothes the uneven usage frequency of the normal RACH resource or the EDT RACH resource. Can be Therefore, the RACH collision caused by the concentrated use of EDT RACH resources can be mitigated. In addition, since only the user device 200 that requires the EDT function having a large amount of uplink data or good communication quality can use the EDT RACH resource, the RACH resource that the network reserves for EDT is reduced as much as possible. Can do. Further, when the message 3 is retransmitted in the random access procedure by EDT, it is possible to eliminate the communication of the message 3 by reducing the data size or by falling back to normal random access.

That is, when performing an initial access in which EDT is applied from the user apparatus to the base station apparatus, resources related to the initial access can be efficiently used.

(Device configuration)
Next, functional configuration examples of the base station apparatus 100 and the user apparatus 200 that execute the processes and operations described so far will be described. The base station apparatus 100 and the user apparatus 200 include functions for implementing the above-described embodiments. However, each of the base station apparatus 100 and the user apparatus 200 may have only some functions in the embodiments.

<Base station apparatus 100>
FIG. 6 is a diagram illustrating an example of a functional configuration of the base station apparatus 100. As illustrated in FIG. 6, the base station apparatus 100 includes a transmission unit 110, a reception unit 120, a setting information management unit 130, and an initial access processing unit 140. The functional configuration shown in FIG. 6 is merely an example. As long as the operation | movement which concerns on embodiment of this invention can be performed, the name of a function division and a function part may be what.

The transmission unit 110 includes a function of generating a signal to be transmitted to the user apparatus 200 and transmitting the signal wirelessly. The reception unit 120 includes a function of receiving various signals transmitted from the user apparatus 200 and acquiring, for example, higher layer information from the received signals. Further, the transmission unit 110 has a function of transmitting PSS, SSS, PBCH, DL / UL control signals, and the like to the user apparatus 200. For example, the transmission unit 110 transmits broadcast information or UL scheduling including information used for initial access to the user apparatus 200, and the reception unit 120 has a function of receiving a RACH preamble from the user apparatus 200.

The setting information management unit 130 stores setting information set in advance and various setting information to be transmitted to the user apparatus 200. The contents of the setting information are, for example, information related to transmission / reception parameters for initial access.

As described in the embodiment, the initial access processing unit 140 notifies the user device 200 of information used for the initial access, and processes when receiving the message 1 and the message 3 related to the initial access transmitted from the user device 200. , Send message 2 and so on.

<User device 200>
FIG. 7 is a diagram illustrating an example of a functional configuration of the user device 200. As illustrated in FIG. 7, the user device 200 includes a transmission unit 210, a reception unit 220, a setting information management unit 230, and an initial access control unit 240. The functional configuration shown in FIG. 7 is merely an example. As long as the operation | movement which concerns on embodiment of this invention can be performed, the name of a function division and a function part may be what.

The transmission unit 210 creates a transmission signal from the transmission data and transmits the transmission signal wirelessly. The receiving unit 220 wirelessly receives various signals and acquires higher layer signals from the received physical layer signals. In addition, the reception unit 220 has a function of receiving PSS, SSS, PBCH, DL / UL control signals and the like transmitted from the base station apparatus 100. For example, the transmission unit 210 has a function of transmitting PRACH, PUSCH, and the like to the base station apparatus 100.

The setting information management unit 230 stores various setting information received from the base station apparatus 100 or the user apparatus 200 by the receiving unit 220. The setting information management unit 230 also stores setting information set in advance. The contents of the setting information are, for example, information related to transmission / reception parameters for initial access.

As described in the embodiment, the initial access control unit 240 generates a preamble and a message related to initial access transmitted from the user apparatus 200 to the base station apparatus 100. Further, the initial access control unit 240 receives information related to the initial access from the base station apparatus 100 and controls transmission / reception of the user apparatus 200 based on the information. A function unit related to signal transmission in the initial access control unit 240 may be included in the transmission unit 210, and a function unit related to signal reception in the initial access control unit 240 may be included in the reception unit 220.

(Hardware configuration)
The functional configuration diagrams (FIGS. 6 and 7) used to describe the above-described embodiment of the present invention show functional unit blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device in which a plurality of elements are physically and / or logically combined, or two or more devices physically and / or logically separated may be directly and directly. It may be realized by a plurality of these devices connected indirectly (for example, wired and / or wirelessly).

Also, for example, both the base station apparatus 100 and the user apparatus 200 according to the embodiment of the present invention may function as a computer that performs processing according to the embodiment of the present invention. FIG. 8 is a diagram illustrating an example of a hardware configuration of a radio communication apparatus that is the base station apparatus 100 or the user apparatus 200 according to the embodiment of the present invention. Each of the base station apparatus 100 and the user apparatus 200 described above is physically a computer apparatus including a processor 1001, a storage apparatus 1002, an auxiliary storage apparatus 1003, a communication apparatus 1004, an input apparatus 1005, an output apparatus 1006, a bus 1007, and the like. It may be configured.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configuration of the base station apparatus 100 and the user apparatus 200 may be configured to include one or a plurality of apparatuses indicated by 1001 to 1006 shown in the figure, or may be configured not to include some apparatuses. May be.

Each function in the base station apparatus 100 and the user apparatus 200 is performed by causing the processor 1001 to perform computation by reading predetermined software (program) on hardware such as the processor 1001 and the storage device 1002, and the communication by the communication apparatus 1004. This is realized by controlling reading and / or writing of data in the storage device 1002 and the auxiliary storage device 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like.

Further, the processor 1001 reads a program (program code), software module, or data from the auxiliary storage device 1003 and / or the communication device 1004 to the storage device 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the transmission unit 110, the reception unit 120, the setting information management unit 130, and the initial access processing unit 140 of the base station device 100 illustrated in FIG. 6 are realized by a control program that is stored in the storage device 1002 and operates on the processor 1001. May be. In addition, for example, the transmission unit 210, the reception unit 220, the setting information management unit 230, and the initial access control unit 240 of the user device 200 illustrated in FIG. 7 are stored in the storage device 1002 and run on the processor 1001. It may be realized by. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

The storage device 1002 is a computer-readable recording medium. For example, the storage device 1002 is at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. It may be configured. The storage device 1002 may be called a register, a cache, a main memory (main storage device), or the like. The storage device 1002 can store a program (program code), a software module, and the like that can be executed to perform the processing according to the embodiment of the present invention.

The auxiliary storage device 1003 is a computer-readable recording medium, such as an optical disc such as a CD-ROM (Compact Disc) ROM, a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). -Ray (registered trademark) disk), smart card, flash memory (eg, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, etc. The auxiliary storage device 1003 may be referred to as an auxiliary storage device. The above-described storage medium may be, for example, a database including the storage device 1002 and / or the auxiliary storage device 1003, a server, or other suitable medium.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the transmission unit 110 and the reception unit 120 of the base station device 100 may be realized by the communication device 1004. Further, the transmission unit 210 and the reception unit 220 of the user device 200 may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device such as the processor 1001 and the storage device 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured with a single bus or may be configured with different buses between apparatuses.

The base station apparatus 100 and the user apparatus 200 each include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), and the like. The hardware may be configured, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

(Summary of embodiment)
As described above, according to the embodiment of the present invention, a user apparatus that communicates with a base station apparatus, the first transmission unit that transmits a random access preamble to the base station apparatus, and the random A receiving unit that receives an access preamble response from the base station device; a second transmitting unit that transmits data to the base station device based on information instructing data transmission included in the random access preamble response; A user apparatus is provided that includes a control unit that selects the random access preamble transmitted by the first transmission unit based on a predetermined condition.

With the above configuration, the user apparatus 200 can select a random access preamble for EDT according to conditions during initial access. That is, when performing initial access to which EDT is applied from the user apparatus to the base station apparatus, resources related to the initial access can be efficiently used.

The predetermined condition may be a condition in which a retention amount of data transmitted to the base station apparatus is determined with a predetermined threshold. With this configuration, since the user apparatus 200 determines whether to use the EDT RACH resource according to the amount of data, the user apparatus 200 can smooth the deviation in the usage frequency of the normal RACH resource or the EDT RACH resource. Therefore, the RACH collision caused by the concentrated use of EDT RACH resources can be mitigated.

The predetermined condition may be a condition in which the coverage extension level or the communication quality is determined with a predetermined threshold. With this configuration, since the user apparatus 200 determines whether to use the EDT RACH resource according to the communication quality or the like, the user apparatus 200 can smooth the bias in the usage frequency of the normal RACH resource or the EDT RACH resource. . Therefore, the RACH collision caused by the concentrated use of EDT RACH resources can be mitigated.

The predetermined condition may be a condition for selecting a random access preamble different from the random access preamble when the first transmission unit fails to transmit the random access preamble a predetermined number of times. With this configuration, the user apparatus 200 can fall back to a normal random access procedure when transmission of a random access preamble for EDT fails.

In addition, according to the embodiment of the present invention, a user apparatus that communicates with a base station apparatus, a first transmission unit that transmits a random access preamble to the base station apparatus, and a response to the random access preamble A receiving unit that receives from the base station device; a second transmitting unit that transmits data to the base station device based on information instructing data transmission included in the response of the random access preamble; and the second transmission When the transmission unit fails to transmit the data, a user apparatus is provided that includes a control unit that reduces the data size at the time of retransmission to be smaller than the data size at the time of transmission failure.

With the above configuration, when the user apparatus 200 fails to transmit the message 3 during the initial access to perform EDT, the data size is reduced, the communication of the message 3 is facilitated, and random access fails many times. It is possible to prevent consumption of RACH resources. That is, when performing initial access to which EDT is applied from the user apparatus to the base station apparatus, resources related to the initial access can be efficiently used.

In addition, according to the embodiment of the present invention, a base station apparatus that communicates with a user apparatus, the first receiving unit that receives a random access preamble from the user apparatus, and the response of the random access preamble A transmission unit for transmitting to the user apparatus; a second reception unit for receiving data from the user apparatus based on information instructing data transmission included in the response of the random access preamble; and a data size at the time of retransmission of the data There is provided a base station apparatus including a processing unit that includes, in a response to the random access preamble, information indicating that the maximum number of retransmissions of the data or use of a random access preamble different from the random access preamble is used.

With the above configuration, the base station apparatus 100 notifies the user apparatus 200 of the data size of the message 3, the maximum number of retransmissions of data, or a fallback instruction to normal random access by a random access response at the time of initial access for performing EDT. By doing so, it is possible to prevent consumption of RACH resources due to failure of random access many times. That is, when performing initial access to which EDT is applied from the user apparatus to the base station apparatus, resources related to the initial access can be efficiently used.

(Supplement of embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various variations, modifications, alternatives, substitutions, and the like. I will. Although specific numerical examples have been described in order to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The classification of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, or the items described in one item may be used in different items. It may be applied to the matters described in (if not inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to physical component boundaries. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. About the processing procedure described in the embodiment, the processing order may be changed as long as there is no contradiction. For convenience of description of the processing, the base station apparatus 100 and the user apparatus 200 have been described using functional block diagrams. However, such apparatuses may be realized by hardware, software, or a combination thereof. The software operated by the processor of the base station apparatus 100 according to the embodiment of the present invention and the software operated by the processor of the user apparatus 200 according to the embodiment of the present invention are random access memory (RAM), flash memory, and reading, respectively. It may be stored in a dedicated memory (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server or any other suitable storage medium.

Further, the notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, notification of information includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block)), other signals, or a combination thereof, and RRC signaling may be referred to as an RRC message. It may be a connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.

Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

The processing procedures, sequences, flowcharts and the like of each aspect / embodiment described in this specification may be switched in order as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

In this specification, the specific operation performed by the base station apparatus 100 may be performed by the upper node in some cases. In a network composed of one or a plurality of network nodes (network nodes) having the base station apparatus 100, various operations performed for communication with the user apparatus 200 are other than the base station apparatus 100 and / or the base station apparatus 100. Obviously, it can be done by other network nodes (for example, but not limited to MME or S-GW). Although the case where there is one network node other than the base station apparatus 100 in the above is illustrated, a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

Each aspect / embodiment described in this specification may be used alone, in combination, or may be switched according to execution.

The user equipment 200 can be obtained by those skilled in the art from a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, It may also be referred to as a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terminology.

Base station apparatus 100 may also be referred to by those skilled in the art as NB (NodeB), eNB (evolved NodeB), gNB, Base Station, or some other appropriate terminology.

As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment” and “determination” are, for example, judgment (judging), calculation (calculating), calculation (processing), processing (deriving), investigating (investigating), searching (looking up) (for example, table , Searching in a database or another data structure), considering ascertaining as “determining”, “deciding”, and the like. In addition, “determination” and “determination” are reception (for example, receiving information), transmission (for example, transmitting information), input (input), output (output), and access. (Accessing) (eg, accessing data in a memory) may be considered as “determined” or “determined”. In addition, “determination” and “determination” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “determining”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

As used herein, the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

As long as “include”, “including”, and variations thereof are used in the specification or claims, these terms are similar to the term “comprising”. It is intended to be comprehensive. Further, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

Throughout this disclosure, if articles are added by translation, for example, a, an, and the, in English, these articles may be plural unless the context clearly indicates otherwise. Can be included.

In the embodiment of the present invention, the initial access control unit 240 is an example of a control unit. The transmission unit 210 is an example of a first transmission unit or a second transmission unit. The receiving unit 120 is an example of a first receiving unit or a second receiving unit. The initial access processing unit 140 is an example of a processing unit. The information indicating whether or not to perform the fallback to the random access using the non-EDT preamble and the non-EDT RACH resource is an example of information indicating that a random access preamble different from the random access preamble is used. The CE level is an example of a coverage extension level.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

DESCRIPTION OF SYMBOLS 100 Base station apparatus 110 Transmission part 120 Reception part 130 Setting information management part 140 Initial access processing part 200 User apparatus 210 Transmission part 220 Reception part 230 Setting information management part 240 Initial access control part 1001 Processor 1002 Storage apparatus 1003 Auxiliary storage apparatus 1004 Communication Device 1005 Input device 1006 Output device

Claims (6)

A user device that communicates with a base station device,
A first transmitter that transmits a random access preamble to the base station device;
A receiving unit that receives a response of the random access preamble from the base station device;
A second transmitter that transmits data to the base station apparatus based on information instructing data transmission included in the response of the random access preamble;
A user apparatus comprising: a control unit that selects the random access preamble transmitted by the first transmission unit based on a predetermined condition. The user apparatus according to claim 1, wherein the predetermined condition is a condition in which a retention amount of data transmitted to the base station apparatus is determined by a predetermined threshold. The user apparatus according to claim 1, wherein the predetermined condition is a condition for determining a coverage extension level or a communication quality with a predetermined threshold. The user apparatus according to claim 1, wherein the predetermined condition is a condition for selecting a random access preamble different from the random access preamble when the first transmission unit fails to transmit the random access preamble a predetermined number of times. A user device that communicates with a base station device,
A first transmitter that transmits a random access preamble to the base station device;
A receiving unit that receives a response of the random access preamble from the base station device;
A second transmitter that transmits data to the base station apparatus based on information instructing data transmission included in the response of the random access preamble;
A user apparatus comprising: a control unit configured to make a data size at the time of retransmission smaller than a data size at the time of transmission failure when the second transmission unit fails to transmit the data. A base station device that communicates with a user device,
A first receiving unit for receiving a random access preamble from the user apparatus;
A transmission unit for transmitting a response of the random access preamble to the user apparatus;
A second receiving unit that receives data from the user apparatus based on information instructing data transmission included in the response of the random access preamble;
A base station apparatus comprising: a processing unit that includes, in a response to the random access preamble, a data size at the time of retransmission of the data, a maximum number of retransmissions of the data, or information indicating that a random access preamble different from the random access preamble is used.

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