JP2018182360A - Terminal device, control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To establish a communication method having low delay and high reliability.SOLUTION: A terminal device capable of transmitting or receiving a wireless signal between a base station device and itself, transmits a first wireless signal related to data without transmitting a scheduling request to the base station device when data to be transmitted occurs, transmits one or more second wireless signals for retransmitting the data continuously until predetermined time passes after transmitting the first wireless signal or until receiving uplink grant from the base station device, stops continuous transmission of the second wireless signal when receiving the uplink grant from the base station device before the predetermined time passes, and transmits a third wireless signal for retransmitting the data according to the uplink grant.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a transmission control technique of a signal by a terminal device.

  In the fifth generation wireless communication technology, technology is being studied to realize ultra reliable low latency communication (URLLC) that requires very high reliability and very low delay. For example, in order to realize low delay, grant-free transmission in which a terminal apparatus transmits a data signal without receiving an uplink grant from a base station apparatus has been studied (see Non-Patent Document 1).

Kelvin Au et al., "Uplink Contention Based SCMA for 5G Radio Access", Globecom 2014 Workshop-Emerging Technologies for 5G Wireless Cellular Networks, pp. 900-905, 2014

  When an uplink data signal is transmitted regardless of the uplink grant, retransmission is performed if the signal is not properly received by the base station apparatus. However, if the base station apparatus takes a long time to request retransmission, it may not be possible to meet the low delay requirement. On the other hand, it is not easy to ensure reliability unless retransmission is performed.

  The present invention has been made in view of the above problems, and aims to establish a low delay and highly reliable communication method.

  A terminal device according to an aspect of the present invention is a terminal device capable of communicating with a base station device, and communication means capable of transmitting or receiving a radio signal with the base station device, and the communication means Control means for controlling the first radio signal relating to the data without transmitting a scheduling request to the base station apparatus when the data to be transmitted is generated. The communication means is controlled to transmit, and the control means continuously continues the transmission until the predetermined time elapses after the transmission of the first radio signal or until the uplink grant is received from the base station apparatus. The communication means is controlled to transmit one or more second radio signals for retransmitting data, and the control means transmits the uplink from the base station apparatus before the predetermined time has elapsed. When the runt is received, the continuous transmission of the second radio signal is stopped, and the communication means is controlled to transmit a third radio signal for retransmitting the data according to the uplink grant. To be characterized.

  According to the present invention, low delay and highly reliable communication is possible.

The figure which shows the structural example of a radio | wireless communications system. The figure which shows the hardware structural example of a terminal device. FIG. 2 is a block diagram showing an example of the functional configuration of a terminal device. The figure which shows the example of the flow of the process which a terminal device performs.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(System configuration)
FIG. 1 shows the configuration of a wireless communication system according to the present embodiment. The present wireless communication system is configured to include, for example, a terminal device and a base station device that can communicate with the fifth generation wireless communication technology. The terminal apparatus and the base station apparatus may be capable of using wireless communication technology prior to the fourth generation, such as Long Term Evolution (LTE), or may use wireless communication technology other than cellular communication technology. It may be. Although FIG. 1 shows an example in which one terminal apparatus and one base station apparatus are provided for the sake of simplicity, in general, a large number of terminal apparatuses and base station apparatuses exist, which will be described below. Such processing can be performed.

  In the present embodiment, communication control when the terminal device transmits a wireless signal (wireless packet) to the base station device will be described. The terminal apparatus transmits a radio signal relating to the data to the base station apparatus in response to the occurrence of data (user data) to be transmitted.

  Generally, when user data is generated, the terminal apparatus transmits a scheduling request to the base station apparatus, receives an uplink grant from the base station apparatus, and receives the uplink grant according to the uplink grant. Transmit radio signals related to user data. Here, the wireless signal related to user data includes, for example, a wireless signal in which user data transformed by coding or the like is included in a mode suitable for the format of the wireless signal. That is, the wireless signal related to the user data may be a wireless signal in which the user data itself is stored, or may be any form of wireless signal capable of recovering the user data from the wireless signal.

  However, in communication based on such an uplink grant, it takes a certain amount of time or more from when data to be transmitted is generated at the terminal to when a radio signal related to the data is actually transmitted. For this reason, grant-free communication not based on uplink grant is being considered in order to reduce communication delay. In grant free communication, the terminal device transmits a wireless signal on a wireless resource (frequency and time slot) preset for grant free communication. The base station apparatus monitors the reception power of the preset radio resource, and when the reception power of the radio resource is equal to or more than a predetermined value, determines that the radio signal is received, and demodulates the radio signal. Do. By this means, it is possible to omit the scheduling request and uplink grant when transmitting from the terminal apparatus to the base station apparatus, and it is possible to reduce the communication delay. In this method, when the transmitted signal fails to be decoded in the base station apparatus, the base station apparatus transmits a negative acknowledgment (NACK) to the terminal apparatus to cause the terminal apparatus to retransmit the radio signal, thereby achieving communication reliability. Can be enhanced. Note that, instead of transmitting NACK or in parallel with NACK transmission, the base station device issues an uplink grant and causes retransmission to be performed on the radio resource designated by the uplink grant. Can. However, in this case, since it takes a certain time for NACK or uplink grant from the base station apparatus to reach the terminal apparatus, it may not be possible to meet the low delay requirement.

  On the other hand, the terminal apparatus of the present embodiment does not transmit the scheduling request in response to the generation of the transmission target data, and transmits the first wireless signal related to the data until the predetermined time elapses. Alternatively, the second radio signal related to the data is continuously retransmitted until the uplink grant is received from the base station apparatus. That is, whether the terminal apparatus receives the uplink grant from the base station apparatus or whether or not the base station apparatus has successfully received the radio signal until the predetermined time elapses, Retransmit. The second radio signal is also transmitted using a radio resource for grant free communication. As a result, data is retransmitted without transmitting a scheduling request to the base station apparatus and without receiving an uplink grant, and it is possible to perform communication with low delay and high reliability. Note that the terminal device stops continuous transmission of the second radio signal in response to receiving the uplink grant before the predetermined time has elapsed, and retransmits the same data according to the uplink grant. Transmit a third wireless signal. According to this, for example, when (the base station device) fails to receive data (continuously), the data can be received more reliably by specifying a radio resource that can be used only by the radio signal related to the data. Can be made to Also, since the transmission of the second radio signal is stopped by the uplink grant, the unnecessary use of radio resources for grant free communication is prevented, and interference with radio signals of other grant free communication is suppressed. Can. The base station apparatus may or may not transmit an acknowledgment (ACK) when the first radio signal or the second radio signal is successfully received. The terminal device may end transmission of the second wireless signal when receiving an acknowledgment from the base station device. In addition, even if the terminal device does not receive an acknowledgment from the base station device, the terminal device ends the transmission of the second wireless signal after the elapse of a predetermined time. That is, only when the base station apparatus fails to receive the radio signal, the base station apparatus notifies the terminal apparatus of the failure in reception by the uplink grant, and implicitly transmits the reception success to the terminal apparatus by transmitting nothing. It can.

  The length of the predetermined time may be specified, for example, in the terminal device based on an estimated value of (for example, downlink) channel loss between the base station device and the terminal device. For example, when the transmission path loss is large, the probability that the base station apparatus successfully receives a radio signal can be increased by lengthening the predetermined time, and the reliability of communication can be improved. In addition, an upper limit value may be provided for the length of the predetermined time, for example, in accordance with a request for delay. In addition, the terminal device determines the transmission powers of the first radio signal and the second radio signal based on the estimated value of the transmission path loss, and the first radio signal and the second radio signal are determined by the determined transmission power. A wireless signal may be transmitted. For example, when the transmission path loss is large, the transmission power can be increased to increase the probability that the base station apparatus successfully receives a radio signal, thereby improving communication reliability. Also, the terminal device may gradually increase the transmission power of the second radio signal for retransmission. As a result, the reliability of communication can be improved, and since radio signals are transmitted with relatively small transmission power at the start of communication, interference with other radio signals can be reduced.

  Note that the first wireless signal, the second wireless signal, and the third wireless signal may be different signals or the same signal. For example, in at least one of these radio signals, in order to increase the redundancy by the error correction code, a redundancy version (for example, specifying a position of a bit in a bit string after channel coding) RV) may be different.

  Here, the terminal device may start transmission of a radio signal for another data after transmission of the radio signal for one data is completed. The terminal device continuously transmits the second wireless signal after transmitting the first wireless signal, for example, for the first data, and then, the second wireless signal (or in some cases, the third wireless signal) The transmission of the first radio signal for the second data may begin after the end of the transmission of the. Also, the terminal device may transmit wireless signals for a plurality of data in parallel. For example, the terminal device transmits the first wireless signal for the first data, and then transmits the first wireless signal for the second data, and then the second wireless signal for the first data, The wireless signal may be transmitted in the order of the wireless signal for the second data. In these cases, the terminal device is configured to transmit the first radio signal and the second radio signal of another data to at least one of the first radio signal and the second radio signal for at least one of the plurality of data. The information may be transmitted (multiplexed) including distinguishable information from the wireless signal of This distinguishable information is, for example, the process ID of the hybrid automatic repeat request (HARQ) and / or an indicator (New Data Indicator, NDI) indicating that data different from the data transmitted so far is to be transmitted. It can be

  For example, a first wireless signal including a predetermined HARQ process ID is generated and transmitted for first data generated in the terminal apparatus in a state where communication is not performed. In this case, the HARQ process ID may be omitted by using the HARQ process ID that allows both the terminal apparatus and the base station apparatus to identify. For example, when a predetermined HARQ process ID is used for the first data transmission, or when the terminal apparatus and the base station apparatus can acquire the same HARQ process ID by a predetermined operation, the HARQ process ID is included in the radio signal. It does not have to be. The terminal apparatus and the base station apparatus can be configured to calculate a common HARQ process ID using the same calculation formula based on commonly identifiable information such as, for example, the ID of the terminal apparatus and time. In addition, even when the terminal apparatus and the base station apparatus use a common preset HARQ process ID, or even when the common HARQ process ID can be identified by calculation or the like, the HARQ process ID becomes a radio signal. It may be included. After that, when the second radio signal for retransmission is transmitted immediately after the transmission of the first radio signal regarding the first data, the HARQ process ID may not be included for the second radio signal. When the HARQ process ID is not included in the received signal, the base station apparatus can specify that the HARQ process ID of the received signal is the same as the radio signal received immediately before. In such a case, the HARQ process ID may be included in the second wireless signal. Then, for a radio signal for the second data, transmitted after or in parallel with the radio signal for the first data, that it is not a radio signal for the first data, ie the first data Information that can be distinguished from the wireless signal related to Thus, for example, the first radio signal for the second data includes an HARQ process ID different from the HARQ process ID for the first data. That is, since the first radio signal, which is the radio signal of the first transmission regarding the second data, relates to data different from the radio signal transmitted immediately before, the HARQ process ID is included. On the other hand, when the second radio signal for retransmission related to the second data is continuously transmitted immediately after the first radio signal related to the second data, the same HARQ process ID is used, so that the HARQ The process ID may not be included. On the other hand, if the second radio signal related to the second data is transmitted immediately after the first radio signal or the second radio signal related to the first data, a different HARQ process ID from the immediately preceding radio signal is used. The HARQ process ID is included in a second radio signal related to this second data. Note that the second HARQ process ID included in the wireless signal related to the second data is a sequential number with the first HARQ process ID included in the wireless signal related to the first data, etc. It may be related information.

  Also, for example, NDI may be used to distinguish two different data when transmitting the two different data using the same HARQ process ID. For example, when the same data is transmitted by a plurality of radio signals of the same HARQ process ID, the plurality of radio signals include the same NDI, and another data is transmitted by a radio signal of the same HARQ process ID Different NDIs will be included if they are to be For example, when the same HARQ process ID is used in two consecutive radio signals (including when the HARQ process ID is not used), the terminal apparatus may set the radio signal to an NDI value different from the NDI of the immediately preceding radio signal. By being included, it is possible to notify the base station apparatus that the radio signal and the immediately preceding radio signal relate to different data. Also, for example, when the same data is transmitted by a plurality of radio signals of the same HARQ process ID, the radio signal for the first transmission among the plurality of radio signals includes the NDI, and the radio signal for the retransmission The NDI may not be included. That is, it is configured to mean that the wireless signal in which the NDI is included is a wireless signal related to the transmission of data different from the data previously associated with the HARQ process ID included in the wireless signal. May be For example, when the same HARQ process ID is used in two consecutive radio signals, the terminal device includes the NDI in the radio signal to ensure that the radio signal and the immediately preceding radio signal relate to different data. The station apparatus can be notified. In this way, the terminal device can transmit a signal so that radio signals for a plurality of different data can be distinguished in the base station device, whereby a plurality of data can be transmitted in series or in parallel. It becomes possible to transmit by grant free communication.

  Note that, as described above, the terminal device can use different RVs when transmitting a plurality of wireless signals related to one data. In this case, the terminal device can include information indicating which RV is used in each wireless signal. This makes it possible to introduce advanced decoding processing in grant free communication. Note that, for example, RV = 1 in the case of the first transmission, RV = 2 in the case of the first retransmission, and RV = 3 in the case of the second retransmission according to the number of times of transmission of the radio signal for one data. If the base station apparatus can uniquely identify an RV beforehand, such as, etc., the information on the RV may not be notified. Also, information on the RV may be included in the wireless signal only when the immediately preceding wireless signal is different from the RV.

  The following describes the configuration of a terminal device that executes such processing and the flow of the processing that is performed.

(Device configuration)
FIG. 2 shows an example of the hardware configuration of the terminal device. In one example, the terminal device has a hardware configuration as illustrated in FIG. 2 and includes, for example, a CPU 201, a ROM 202, a RAM 203, an external storage device 204, and a communication device 205. In the terminal device, for example, a program for realizing each function of the terminal device, which is recorded in any of the ROM 202, the RAM 203, and the external storage device 204, is executed by the CPU 201. The CPU 201 may be replaced by one or more processors such as an ASIC (application specific integrated circuit), an FPGA (field programmable gate array), and a DSP (digital signal processor).

  Then, the terminal device controls the communication device 205, for example, by the CPU 201 to perform communication with the base station device. In addition, in FIG. 2, although the terminal device shows the schematic as it has one communication apparatus 205, it is not restricted to this. For example, the terminal device may have two or more communication devices 205 to communicate with two or more base station devices, and further, another communication device 205 for communication in another system. You may have.

  The terminal device may be provided with dedicated hardware for executing each function, or may execute a part of the hardware and a computer for operating the program to execute the other part. Also, all functions may be performed by a computer and a program.

  FIG. 3 is a diagram showing an example of a functional configuration of the terminal device. The terminal device includes, for example, a communication unit 301 and a communication control unit 302, and in some cases, further includes a transmission path estimation unit 303.

  The communication unit 301 can communicate with one or more base station apparatuses, receives an uplink grant from the base station apparatus (for example, transmits a scheduling request), and uses a radio resource designated by the uplink grant. Uplink radio signals can be transmitted. Further, the communication unit 301 transmits an uplink radio signal using a predetermined radio resource without transmitting a scheduling request and receiving an uplink grant to the base station apparatus, that is, grant free. Can. Here, the predetermined radio resource is a radio resource for grant free communication, and may be used also when another terminal apparatus performs grant free communication. The communication unit 301 can also receive a downlink radio signal from the base station apparatus.

  The communication control unit 302 controls wireless communication by the communication unit 301. When performing communication based on the uplink grant, the communication control unit 302 transmits, for example, a scheduling request to the base station apparatus, receives an uplink grant from the base station apparatus, and is designated by the received uplink grant. The communication unit 301 is controlled to transmit the uplink signal using the radio resource. Further, when performing grant free communication, the communication control unit 302 controls the communication unit 301 to transmit an uplink signal using a predetermined radio resource for grant free communication. Note that, when grant-free communication is performed for certain data, the communication control unit 302 performs, after grant-free transmission of the first wireless signal for initial transmission of the data, a second for retransmission of the same data. The communication unit 301 is controlled to continuously transmit a wireless signal grant free. Communication control section 302 controls communication section 301 to continue transmission of the second radio signal until an uplink grant is received from the base station apparatus or until a predetermined time has elapsed. Then, when the uplink grant is received before the predetermined time has elapsed, the communication control unit 302 transmits the third radio signal for retransmission of the data according to the uplink grant. Control 301; On the other hand, when the predetermined time has elapsed, the communication control unit 302 stops the transmission of the wireless signal related to the data, for example, starts the transmission of the wireless signal related to the data to be transmitted next.

  Further, in the case where the communication control unit 302 transmits a plurality of data in parallel simultaneously or continuously transmits the next data after transmitting one data, the information for enabling the plurality of data to be distinguishable is wireless The communication unit 301 can be controlled to be included (multiplexed) in the signal. For example, the communication control unit 302 can control the communication unit 301 so as to use the HARQ process ID and the NDI as information for making the plurality of data distinguishable.

  The communication control unit 302 controls the communication unit 301 by determining the transmission power of the first radio signal or the second radio signal for a predetermined time or according to the channel loss estimated by the channel estimation unit 303. sell. The channel estimation unit 303 estimates channel loss based on, for example, the radio signal from the base station apparatus received via the communication unit 301.

(Flow of processing)
Subsequently, a flow of processing performed by the terminal device according to the present embodiment will be described using FIG. 4.

  In this process, when data to be transmitted is generated in the base station apparatus, the terminal apparatus determines whether to transmit a radio signal relating to the data by grant free communication (S401). For example, the terminal apparatus may determine to perform grant-free communication when the allowable amount of delay is lower than a predetermined value with respect to transmission of a wireless signal related to the data. Note that the terminal device may determine whether to perform grant free communication according to other criteria, and may be preset if all wireless signals are transmitted by grant free communication. If all radio signals are transmitted by grant free communication, the process of S401 may be omitted.

  When the terminal device determines to transmit the radio signal based on the uplink grant (NO in S401), it transmits a scheduling request to the base station device (S406), and bases the uplink grant according to the scheduling request. It receives from the station apparatus (S407). Then, the terminal apparatus transmits a radio signal related to data to be transmitted, using the radio resource designated by the uplink grant (S408), and ends the processing.

  On the other hand, when it is determined that the terminal apparatus transmits the wireless signal by grant free communication (YES in S401), the terminal apparatus transmits a wireless signal substantially including data to be transmitted using a predetermined wireless resource for grant free communication. (S402). The transmission power of the radio signal at this time is, for example, based on the downlink transmission path loss from the base station apparatus to the terminal apparatus, or, if possible, to the uplink transmission path loss from the terminal apparatus to the base station apparatus. It can be determined based on.

  Thereafter, the terminal apparatus monitors whether or not the uplink grant has been received from the base station apparatus, and whether or not an elapsed time after transmission of the signal in S402 has reached a predetermined time (S403, S404). Here, the predetermined time here is, for example, based on the downlink transmission path loss from the base station apparatus to the terminal apparatus, or based on the uplink transmission path loss from the terminal apparatus to the base station apparatus if possible. Can be determined. When the terminal apparatus has not received the uplink grant from the base station apparatus and the predetermined time has not elapsed (NO in S403 and NO in S404), the radio for retransmission of the same transmission target data A signal is transmitted on a radio resource for grant free communication (S405). Then, the terminal apparatus continues monitoring whether the uplink grant has been received from the base station apparatus and whether the elapsed time after the transmission of the signal in S402 has reached a predetermined time (S403, S404). Note that the radio signal transmitted in S405 and the radio signal transmitted in S402 may be the same radio signal, or may be radio signals different in RV, for example. If the RVs are different, the terminal device may transmit (multiplex) the information of the RV in the radio signal to be transmitted. If the base station apparatus can uniquely identify the RV used in these radio signals, the RV information may not be transmitted. Also, the terminal device may gradually increase the transmission power at the time of retransmission. In this case, for example, transmission power increase control such as increasing transmission power may be performed each time two radio signals are transmitted.

  When the terminal apparatus receives an uplink grant from the base station apparatus after transmitting the signal in S402 or S405 (YES in S403), the terminal apparatus relates to the same transmission target data using a radio resource designated by the uplink grant. The wireless signal is retransmitted (S408), and the transmission process for the data is ended. Note that the terminal device ends the process in response to receiving the acknowledgment from the base station device, and retransmits the radio signal again when a negative response is received from the base station device. Good. In addition, when the elapsed time after the transmission of the signal in S402 reaches the predetermined time (YES in S404), the terminal device ends the transmission processing of the transmission target data here as it is.

  By the above processing, the terminal apparatus performs the retransmission processing of the wireless signal by grant free communication without waiting for a response from the base station apparatus, and thereby the probability that the base station apparatus succeeds in receiving the wireless signal. It is possible to execute low delay communication while enhancing it. In addition, although the process of FIG. 4 has shown the flow of the process regarding one data, transmission of several data may be performed similarly. For example, in the case where radio signals relating to a plurality of data are transmitted by performing transmission of radio signals relating to the next data after completion of transmission of radio signals relating to one data, the process of FIG. By starting the process of FIG. 4 for the second data after being started and finished, the signal transmission process can be serially performed. Also, when transmission of a radio signal for another data is started while transmission of a radio signal for one data is not completed, the processing of FIG. 4 is separately performed for each data. However, in this case, the processing of FIG. 4 is performed in parallel for each of a plurality of data. In addition, when a plurality of data are transmitted, data related to a radio signal transmitted immediately before the data transmitted by the radio signal such as HARQ process ID or NDI is associated with the radio signal transmitted in S402 or S405. If different from the above, information for making the base station apparatus recognize this may be included (multiplexed) in the radio signal. In addition, for example, in the first data communication (for example, data communication performed after communication is not performed for a predetermined period after completion of the previous communication), the base station apparatus and the terminal apparatus are uniquely in common. The identifiable HARQ process ID or the like may be used. In this case, in the first data communication, information such as the HARQ process ID may be omitted. By using information such as HARQ process ID and NDI, it is possible to transmit a plurality of data in parallel or continuously.

  201: CPU, 202: ROM, 203: RAM, 204: external storage device, 205: communication device, 301: communication unit, 302: communication control unit, 303: transmission path estimation unit

Claims (15)

A terminal device capable of communicating with a base station device, wherein
Communication means capable of transmitting and receiving radio signals to and from the base station apparatus;
Control means for controlling the communication means;
Have
The control means controls the communication means to transmit a first wireless signal related to the data without transmitting a scheduling request to the base station apparatus when data to be transmitted is generated.
The control means may continuously retransmit the data until a predetermined time elapses after the transmission of the first radio signal or until an uplink grant is received from the base station apparatus. Control the communication means to transmit two radio signals;
The control means, when receiving the uplink grant from the base station apparatus before the predetermined time has elapsed, stops continuous transmission of the second radio signal, and according to the uplink grant. Controlling the communication means to transmit a third radio signal for retransmitting data;
A terminal device characterized by The control means controls the communication means to transmit the first radio signal and the second radio signal using a predetermined radio resource.
The terminal device according to claim 1, characterized in that: When the control means receives an uplink grant from the base station apparatus before the predetermined time has elapsed, the control means transmits the third radio signal using a radio resource designated by the uplink grant. Control the communication means,
The terminal device according to claim 1 or 2, characterized in that: The control means is configured to transmit the first data and the second data without transmitting a scheduling request to the base station apparatus when the first data and the second data to be transmitted are generated. The first radio signal related to each of the data is transmitted, and the first radio signal is continuously transmitted until a predetermined time passes or until an uplink grant is received from the base station apparatus. Controlling the communication means to transmit one or more of the second radio signals for retransmitting each of the one data and the second data,
The control means further comprises, in at least one of the first wireless signal and the second wireless signal related to the second data, the first wireless signal related to the first data and the second wireless signal. Controlling the communication means to transmit information including information distinguishable from at least one of radio signals;
The terminal device according to any one of claims 1 to 3, characterized in that. The control means is configured to control at least one of the first wireless signal and the second wireless signal related to the first data, the first wireless signal related to the second data and the second wireless signal. Controlling the communication means to transmit information including information distinguishable from at least one of
The terminal device according to claim 4, characterized in that: The distinguishable information includes at least one of a hybrid automatic repeat request (HARQ) process ID and an indicator indicating that data different from data transmitted so far is to be transmitted.
The terminal device according to claim 4 or 5, characterized in that: The control means is configured to prevent the process ID from being included in the second wireless signal when the first wireless signal and the second wireless signal relating to one data are transmitted consecutively. Control,
The terminal device according to claim 6, characterized in that: The control means is configured to prevent the indicator from being included in the second radio signal when the first radio signal and the second radio signal relating to one piece of data are continuously transmitted. Control,
The terminal device according to claim 6 or 7, characterized in that: The control means controls the communication means to transmit redundancy version (RV) information in the second radio signal.
The terminal device according to any one of claims 1 to 8, characterized in that: The control means does not include information on the RV in the second radio signal when the first radio signal transmitted immediately before with respect to the same data or the second radio signal and the RV are the same. Control the communication means to transmit,
The terminal device according to claim 9, characterized in that: The information processing apparatus further comprises identification means for identifying the length of the predetermined time according to the transmission path loss from the base station device to the terminal device.
The terminal device according to any one of claims 1 to 10, characterized in that: The control means controls the communication means to transmit the first radio signal and the second radio signal with a transmission power according to a transmission path loss from the base station device to the terminal device.
The terminal device according to any one of claims 1 to 11, characterized in that: The control means controls the communication means to gradually increase the transmission power of the second radio signal.
The terminal device according to any one of claims 1 to 12, characterized in that: A control method of a terminal apparatus having communication means capable of transmitting or receiving a radio signal to / from a base station apparatus, comprising:
Controlling means for controlling the communication means to transmit a first radio signal relating to the data without transmitting a scheduling request to the base station apparatus when data to be transmitted is generated. ,
One or more first for continuously retransmitting the data until the predetermined time elapses after the transmission of the first radio signal or until the uplink grant is received from the base station apparatus. Controlling the communication means to transmit two radio signals;
When the control means receives the uplink grant from the base station apparatus before the predetermined time has elapsed, the control means stops continuous transmission of the second radio signal, and the control means causes the control unit to stop continuous transmission of the second radio signal, and Controlling the communication means to transmit a third radio signal for retransmitting data;
A control method characterized by including. A computer provided in a terminal apparatus having communication means capable of transmitting and receiving radio signals to and from a base station apparatus;
When the data to be transmitted is generated, the control unit controls the communication unit to transmit a first wireless signal regarding the data to the base station device without transmitting a scheduling request.
One or more second radio signals for retransmitting the data continuously until a predetermined time elapses after transmission of the first radio signal or until an uplink grant is received from the base station apparatus Control the communication means to transmit;
When the uplink grant is received from the base station apparatus before the predetermined time has elapsed, the continuous transmission of the second radio signal is stopped, and the data is retransmitted according to the uplink grant. Controlling the communication means to transmit a third radio signal of
Program for

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