Base station device, terminal device, communication method, and program for reducing delay in wireless communication

Abstract

To reduce delay of radio communications in a cellular communication system.SOLUTION: A base station device notifies a terminal device to establish a connection with the own device or being connected of information indicating a format of a physical uplink control channel (PUCCH) available for transmitting a scheduling request and capable of containing information indicating the kind of communication, selects the kind of transmission permission to be transmitted to the terminal device from among a plurality of kinds of transmission permissions based on the kind of communication indicated in the scheduling request received from the terminal device by the format of the PUCCH, and transmits the kind of transmission permission selected as a response to the scheduling request to the terminal device.SELECTED DRAWING: Figure 5

Description

[Technical field]

[0001] The present invention relates to a technique for reducing delay in wireless communication in a cellular communication system. [Background technology]

[0002] There is a demand for low-latency communications in cellular communication systems, and the Third Generation Partnership Project (3GPP) is currently studying technologies to realize Ultra-Reliable and Low Latency Communications (URLLC). Summary of the Invention [Problem to be solved by the invention]

[0003] The present invention provides a technique for reducing delays in wireless communication in a cellular communication system. [Means for solving the problem]

[0004] A base station device according to one aspect of the present invention is capable of transmitting a scheduling request to a terminal device that has established a connection with the base station device or is currently connected to the base station device, and is configured to: show The Physical Uplink Control Channel (PUCCH) 1. a notification means for notifying information indicating a format, Before Scheduling request a determining means for determining a type of communication by the scheduling request based on whether the scheduling request is received in the first format of the PUCCH or in a second format different from the first format of the PUCCH; The communication device includes a selection means for selecting a type of transmission permission to be transmitted to the terminal device from among a plurality of types of transmission permission based on a type of communication, and a transmission means for transmitting the selected type of transmission permission to the terminal device in response to the scheduling request.

[0005] According to one aspect of the present invention, a terminal device is capable of transmitting a scheduling request from a base station device with which a connection is established or in which a connection is in progress, and the type of communication is showThe Physical Uplink Control Channel (PUCCH) 1. an acquisition means for acquiring information indicating a format; Regarding certain types of communication When sending a signal ,before PUCCH's The first said scheduling request using a format of to the base station device, transmitting the scheduling request using a second format different from the first format of the PUCCH when transmitting a signal related to a type of communication different from the predetermined type of communication to the base station device; The base station device includes a communication means for receiving a transmission permission selected from a plurality of types of transmission permission by the base station device in response to the scheduling request, and for transmitting a signal to the base station device based on the transmission permission. Effect of the Invention

[0006] According to the present invention, it is possible to reduce delays in wireless communication in a cellular communication system. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a diagram illustrating an example of the configuration of a wireless communication system. [Diagram 2] FIG. 2 is a diagram illustrating an example of the hardware configuration of a base station device and a terminal device. [Diagram 3] FIG. 2 is a diagram illustrating an example of a functional configuration of a base station device. [Figure 4] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal device. [Diagram 5] FIG. 1 is a diagram illustrating an example of a flow of processing executed in a wireless communication system. [Figure 6] FIG. 1 is a diagram illustrating an example of a flow of processing executed in a wireless communication system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings. Note that the following embodiments do not limit the invention according to the claims, and not all combinations of features described in the embodiments are essential to the invention. Two or more features among the multiple features described in the embodiments may be arbitrarily combined. In addition, the same reference numbers are used for the same or similar configurations, and duplicated descriptions are omitted.

[0009] (Communication System Configuration) FIG. 1 shows a configuration example of a wireless communication system according to this embodiment. The wireless communication system is, for example, a wireless communication system conforming to a fifth generation (5G) cellular wireless communication standard defined by the Third Generation Partnership Project (3GPP). Note that this is only an example, and other wireless communication systems may be used. The wireless communication system includes, for example, a base station device 101 and a terminal device 102. Note that, for simplicity of explanation, FIG. 1 shows only a small number of base station devices and terminal devices, but naturally, there may be many more base station devices and terminal devices.

[0010] In this wireless communication system, time division duplex (TDD) is used for communication between the base station device 101 and the terminal device 102. In TDD, a common frequency resource is divided into time slots / subframes, and a plurality of time slots / subframes are assigned to either an uplink (a link in a direction from the terminal device 102 to the base station device 101) or a downlink (a link in a direction from the base station device 101 to the terminal device 102). This assignment corresponds to the TDD configuration of Long Term Evolution (LTE) and 5G.

[0011] In a cellular communication system, a mechanism exists in which downlink communication and uplink communication are used in combination to control the communication, and the combination of these may be performed multiple times. When TDD is used, for example, after downlink communication is performed in a downlink time slot, uplink communication cannot be performed until an uplink time slot arrives, so the time until such control communication is completed may be long. For example, when user data to be transmitted occurs, the terminal device 102 transmits a scheduling request (SR) to the base station device 101. Here, if a time slot is assigned to the downlink at the time when it becomes necessary to transmit the SR, the terminal device 102 needs to wait for the time slot assigned to the uplink to arrive. Then, after transmitting the SR in the time slot assigned to the uplink, the terminal device 102 transmits the user data after receiving a transmission permission for uplink user data from the base station device 101 in the downlink. On the other hand, in order to determine how much frequency and time resources to allocate to the terminal device 102 that is the source of the SR, the base station device 101 does not immediately transmit a user data transmission grant (Grant) when the time slot allocated to the downlink arrives, but transmits a transmission grant for a buffer status report (BSR) to the terminal device 102. That is, after receiving the SR, the base station device 101 transmits a transmission grant including information specifying the frequency and time resources for transmitting the BSR. Then, when the terminal device 102 receives the transmission grant including the allocation of the frequency and time resources, it waits for the uplink time slot to arrive and transmits the BSR to the base station device 101 using the allocated frequency and time resources. When the base station device 101 receives this BSR, it waits for the downlink time slot to arrive, allocates the amount of frequency and time resources based on the information reported in the BSR to the terminal device 102, and transmits a transmission grant to the terminal device 102 to transmit user data. By receiving this transmission grant, the terminal device 102 becomes able to transmit user data.

[0012] Here, in TDD, for example, when switching from a downlink time slot to an uplink time slot, a certain guard time must be provided, and as a result, frequent switching between the uplink time slot and the downlink time slot may result in a deterioration in frequency utilization efficiency. Therefore, after communication is performed in an uplink time slot, a certain amount of time is required until the next uplink time slot arrives. Therefore, when a signal is transmitted in an uplink, a downlink signal is transmitted in response to that signal, and further an uplink signal is transmitted in response to that downlink signal, it is necessary to wait for two uplink transmission opportunities in order to transmit the two uplink signals, which requires a certain amount of time.

[0013] As described above, in the conventional communication procedure, in order to prepare for transmission of uplink user data, two round trips of uplink communication and downlink communication occur, that is, transmission of an SR and reception of a transmission permission for a BSR, and transmission of a BSR and reception of a transmission permission for user data. Therefore, the time required for communication preparation from when an SR is transmitted until when user data is actually transmitted becomes long, which may make it difficult to transmit data in real time from the terminal device 102. In view of such circumstances, the present embodiment provides a method for shortening the time required for completion of communication preparation.

[0014] In this embodiment, the above-mentioned BSR transmission permission and user data transmission permission are transmitted and received together in a series of downlink communication opportunities, and similarly, the BSR and user data are permitted to be transmitted and received together in a series of uplink communication opportunities. For example, the base station device 101 may transmit a user data transmission permission to the terminal device 102 before receiving the BSR while transmitting a BSR transmission permission. Note that the base station device 101 may be configured to transmit one transmission permission that combines the BSR transmission permission and the user data transmission permission. Furthermore, the base station device 101 may omit the BSR transmission permission and the reception of the BSR, for example, when it is known in advance that the size of the user data is constant. This allows user data to be transmitted and received in the next uplink communication opportunity in which a series of downlink communications have been performed after the transmission and reception of the SR. This makes it possible to shorten the time from the generation of user data to its transmission. This process may be executed only when the type of communication (type of service) is a specific type that requires real-time performance, and for other types of communication, the BSR transmission permission and the user data transmission permission may be issued after the BSR transmission and reception, as in the conventional method. This allows the user data to be transmitted and received quickly for communication for which real-time performance is important, while for communication for which real-time performance is not important, a preparatory process for identifying the size of the data to be transmitted is executed, and an appropriate amount of frequency and time resources can be identified and allocated.

[0015] In this embodiment, in order to execute the above-mentioned communication procedure, a new format (PUCCH format) of a physical uplink control channel (PUCCH) that can be used for transmitting an SR and can include information that can identify the type of communication is defined. That is, in a fifth generation (5G) cellular communication system, a plurality of PUCCH formats have already been defined, some of which can be used for transmitting an SR, and in addition to these, a new PUCCH format for an SR that includes information indicating the type of communication is defined. Here, this PUCCH format is called "PUCCH format X". The terminal device 102 of this embodiment is configured by the base station device 101 so that it can transmit an SR that includes information that can identify the type of communication (for example, a service identifier) ​​by using PUCCH format X.

[0016] In this embodiment, a base station device 101 supporting the above-mentioned communication procedure notifies a terminal device 102 currently connected to the base station device 101 or attempting to establish a connection to the base station device 101 of a setting for enabling the use of PUCCH format X. The setting of PUCCH format X is notified from the base station device 101 to the terminal device 102 by, for example, a radio resource control (RRC) message. For example, the setting of PUCCH format X can be notified from the base station device 101 to the terminal device 102 by an RRC Reconfiguration message. Note that the base station device 101 does not need to notify the setting of PUCCH format X to the terminal device 102 that does not support PUCCH format X. Also, the base station device 101 may notify surrounding terminal devices that PUCCH format X is available by a system information block (SIB) or the like. Note that the base station device 101 may notify the terminal device 102 of the setting of PUCCH format X together with other available PUCCH formats.

[0017] Based on the setting of PUCCH format X, the terminal device 102 becomes able to transmit an SR using the PUCCH format X. When user data to be transmitted occurs, the terminal device 102 transmits an SR using PUCCH format X to the base station device 101, including information capable of identifying a type of communication, such as which communication service the communication of the user data corresponds to. For example, information capable of identifying whether the type of communication is highly real-time is included in the SR using PUCCH format X and transmitted. Note that, for user data for which the use of a conventional communication procedure is permitted, in which permission to transmit user data is transmitted and received after transmitting and receiving a BSR, the terminal device 102 may transmit an SR including information on a type of communication for which the use of a conventional communication procedure is permitted, to the base station device 101, using PUCCH format X. For user data for which the use of a conventional communication procedure is permitted, the terminal device 102 may transmit an SR using, for example, a conventional PUCCH format.

[0018] The base station device 101 may determine whether to transmit a user data transmission permission without waiting for the BSR to be received or to use a conventional communication procedure, as described above, depending on the type of communication included in this SR. When transmitting a user data transmission permission without waiting for the BSR to be received, the base station device 101 may transmit, for example, the BSR and the user data transmission permission separately, or may transmit the BSR and the user data transmission permission together (as one message). In one example, the base station device 101 may store in advance a type of communication (or a service identifier) ​​that requires real-timeness, and when receiving an SR of PUCCH format X indicating a type of communication that requires real-timeness, may determine to transmit a user data transmission permission without waiting for the BSR to be received. On the other hand, when receiving an SR of PUCCH format X indicating a type of communication that does not require real-timeness, the base station device 101 may transmit a BSR transmission permission first, as in the conventional case, and transmit a user data transmission permission after receiving the BSR. That is, the base station device 101 selects the type of transmission permission based on the type of communication transmitted in PUCCH format X. Then, the base station device 101 transmits the selected type of transmission permission to the terminal device 102 in response to the SR. Note that the information capable of identifying the type of communication may be a service identifier in one example, but may also be information indicating communication quality such as an allowable delay. Also, multiple categories may be defined according to communication quality, and information indicating the category may be used as information capable of identifying the type of communication.

[0019] As described above, the base station device 101 may transmit a user data transmission permission before receiving a BSR in addition to a BSR transmission permission, on the premise that a BSR is transmitted, but this is not limited thereto. For example, instead of or in addition to this, the base station device 101 may transmit a user data transmission permission without transmitting a BSR (without transmitting a BSR transmission permission). For example, information that can specify whether or not a communication type is one in which a predetermined size of user data is determined to be transmitted may be included in an SR using PUCCH format X and transmitted. In this way, a BSR may not be transmitted for communication in which the user data is of a predetermined size. Furthermore, the base station device 101 may allocate a certain amount of frequency and time resources to the terminal device 102 without using a BSR, regardless of the size of the user data, and cause the terminal device 102 to transmit the first user data in the frequency and time resources. In this case, the amount of data remaining in the buffer may be notified to the base station device 101 together with the first user data, and the base station device 101 may allocate frequency and time resources for the second and subsequent user data transmissions based on the information on the amount of data.

[0020] Furthermore, as described above, the base station device 101 may select the type of transmission permission based on the type of communication, but may also select the type of communication depending on whether an SR using PUCCH format X is transmitted or a conventional PUCCH format is used. That is, when PUCCH format X is used, a transmission permission for user data without transmitting a BSR as described above may be transmitted from the base station device 101 to the terminal device 102. In this case, the type of communication may not be indicated in the PUCCH format X. That is, the base station device 101 may select whether to issue a transmission permission for user data without waiting for reception of a BSR or omitting a BSR, or to use a conventional communication procedure, depending on which PUCCH format is used.

[0021] By preparing a new PUCCH format as described above, the base station device 101 can identify whether or not the communication requested by SR is a predetermined type of communication, such as a communication that requires real-time performance. Then, the base station device 101 can reduce the time required to complete preparation for a predetermined type of communication.

[0022] In the following, a description will be given of an example of the configuration of the base station device 101 and the terminal device 102 that execute the above-mentioned processing, and an example of the flow of the processing that is executed.

[0023] (Device configuration) A hardware configuration example of the base station device 101 and the terminal device 102 will be described with reference to FIG. 2. In one example, the base station device 101 and the terminal device 102 are configured to include a processor 201, a ROM 202, a RAM 203, a storage device 204, and a communication circuit 205. The processor 201 is a computer configured to include one or more processing circuits such as a general-purpose CPU (Central Processing Unit) or an ASIC (Application Specific Integrated Circuit), and executes the overall processing of the device and each of the above-mentioned processes by reading and executing a program stored in the ROM 202 or the storage device 204. The ROM 202 is a read-only memory that stores information such as programs and various parameters related to the processing executed by the base station device 101 and the terminal device 102. The RAM 203 functions as a workspace when the processor 201 executes a program, and is a random access memory that stores temporary information. The storage device 204 is configured, for example, by a removable external storage device. The communication circuit 205 is configured, for example, by a circuit for wireless communication of LTE or 5G. Although one communication circuit 205 is illustrated in FIG. 2, the base station device 101 and the terminal device 102 may have multiple communication circuits. For example, the base station device 101 and the terminal device 102 may have a common antenna with wireless communication circuits for LTE and 5G. The base station device 101 and the terminal device 102 may have an antenna for LTE and an antenna for 5G separately. The base station device 101 may further have a wired communication circuit used when communicating with other base station devices or nodes of the core network. The terminal device 102 may have a communication circuit for other wireless communication systems such as a wireless LAN. The base station device 101 and the terminal device 102 may have separate communication circuits 205 for each of a plurality of available frequency bands, or may have a common communication circuit 205 for at least some of those frequency bands.

[0024] 3 is a diagram showing an example of a functional configuration of the base station device 101. The base station device 101 has, for example, a PUCCH format notification unit 301, an SR receiving unit 302, a transmission permission type selection unit 303, and a communication processing unit 304. These functional units can be realized, for example, by executing a program stored in the ROM 202 or the storage device 204 in the processor 201. In addition, some or all of these functions may be realized by dedicated hardware. Note that the base station device 101 naturally has functions as a general base station device other than the functions shown in FIG. 3.

[0025] The PUCCH format notification unit 301 notifies the terminal device 102 of a message for setting to enable transmission of an SR using PUCCH format X. This message is, for example, an RRC message. Furthermore, the PUCCH format notification unit 301 may notify surrounding terminal devices 102 that the base station device 101 can use (supports) PUCCH format X by using a broadcast signal such as an SIB. The SR reception unit 302 receives a scheduling request (SR) from the terminal device 102. The SR reception unit 302 identifies, for example, the PUCCH format used to transmit the SR. Furthermore, when PUCCH format X is used, the SR reception unit 302 may identify the type of communication of user data associated with that SR.

[0026] For example, when an SR is received in a conventional PUCCH format, the transmission permission type selection unit 303 determines to use a conventional communication procedure, first transmits a transmission permission for a BSR, and then, in response to receiving the BSR, determines to transmit a transmission permission for user data to which an amount of frequency-time resources corresponding to the amount of data indicated by the BSR is allocated. In addition, for example, when an SR is received in PUCCH format X, the transmission permission type selection unit 303 can select either transmitting a transmission permission for a BSR and transmitting a transmission permission for user data without waiting for reception of the BSR, or transmitting a transmission permission for user data without the BSR. In addition, for example, even when an SR is received in PUCCH format X, the transmission permission type selection unit 303 may determine to use a conventional communication procedure depending on the type of communication notified by the PUCCH format X. The communication processing unit 304 executes a communication procedure for causing the terminal device 102 to transmit user data based on the type of transmission permission selected by the transmission permission type selection unit 303.

[0027] 4 is a diagram showing an example of a functional configuration of the terminal device 102. The terminal device 102 has, for example, a PUCCH format receiving unit 401, an SR transmitting unit 402, and a communication processing unit 403. These functional units can be realized, for example, by executing a program stored in the ROM 202 or the storage device 204 in the processor 201. In addition, some or all of these functions may be realized by dedicated hardware. Note that the terminal device 102 naturally has functions as a general terminal device other than the functions shown in FIG. 4.

[0028] The PUCCH format receiving unit 401 receives a predetermined message from the base station device 101 and acquires a setting for enabling an SR to be transmitted using PUCCH format X. This predetermined message is, for example, an RRC message. Furthermore, the PUCCH format receiving unit 401 may receive a broadcast signal such as an SIB including information indicating that the base station device 101 can use (supports) PUCCH format X. The SR transmitting unit 402 transmits a scheduling request (SR) to the base station device 101. For example, when performing communication that requires real-time performance and requires a short time from the transmission of an SR to the transmission of user data, the SR transmitting unit 402 transmits an SR using PUCCH format X. Furthermore, when using PUCCH format X, the SR transmitting unit 402 may transmit an SR including information capable of identifying the type of communication.

[0029] The communication processing unit 403 performs communication according to a transmission permission transmitted from the base station device 101 in response to the SR transmitted by the SR transmission unit 402. For example, when the base station device 101 decides to use the conventional communication method, a BSR transmission permission is first received in a downlink communication opportunity, and the communication processing unit 403 transmits a BSR in response to the transmission permission in a subsequent uplink communication opportunity using the frequency and time resources indicated in the transmission permission. Then, when the communication processing unit 403 subsequently receives a transmission permission for user data in a downlink communication opportunity, it transmits the user data in a subsequent uplink communication opportunity using the frequency and time resources indicated in the transmission permission. On the other hand, when the communication processing unit 403 receives a BSR and a transmission permission for user data in one downlink communication opportunity, for example, it transmits a BSR and user data in a subsequent uplink communication opportunity. Furthermore, when the communication processing unit 403 receives a user data transmission permission in response to an SR without receiving a BSR transmission permission, the communication processing unit 403 can transmit the user data in a subsequent uplink communication opportunity without transmitting a BSR.

[0030] (Processing flow) Next, an example of the flow of processing executed in the wireless communication system will be described. Note that the processing described below can be modified in various ways as described above, but the description of the modifications will be omitted here.

[0031] In a wireless communication system, first, a base station device 101 transmits an RRC message including a setting of PUCCH format X to a terminal device 102 that is currently connected or is attempting to establish a connection, so that the terminal device 102 can use PUCCH format X (S501).

[0032] Then, the terminal device 102 transmits an SR in response to the occurrence of user data to be transmitted (S502). Here, the terminal device 102 transmits an SR including information capable of identifying a type of communication that requires real-time communication, using PUCCH format X. When the base station device 101 receives an SR related to a type of communication that requires real-time communication, the base station device 101 transmits a transmission grant for BSR (Grant for BSR) in order to shorten the communication preparation time, and further transmits a transmission grant for user data (Grant for PUSCH) before the BSR is received (S503). Note that the PUSCH is a physical uplink shared channel, and the user data is transmitted using the PUSCH. Also, the base station device 101 may transmit the transmission grant for BSR and the transmission grant for user data by one message, or may transmit these transmission grants by separate messages. When the terminal device 102 receives the transmission grant for BSR and the transmission grant for user data, the terminal device 102 transmits the BSR and the user data in the frequency and time resources designated respectively at the uplink transmission opportunity (S504). In this example, an example in which a BSR is transmitted is shown, but permission to transmit a BSR and transmission of a BSR may be omitted.

[0033] On the other hand, when the terminal device 102 transmits an SR including information capable of identifying a type of communication that does not require real-time communication (S505), the base station device 101 may determine that it is not necessary to shorten the communication preparation time. In this case, the base station device 101 decides to use a conventional communication procedure, and first transmits a transmission permission for a BSR (S506), and after receiving the BSR from the terminal device 102 (S507), transmits a transmission permission for user data (S508). Then, the terminal device 102 transmits the user data based on the transmission permission (S509).

[0034] In this way, the base station device 101 can use the transmission permission for shortening the communication preparation and the transmission permission for the conventional communication preparation according to the type of communication indicated in the SR. Note that, in the above example, the information on the type of communication is classified according to whether or not real-time communication is required, but this is not limited thereto. In other words, whether or not to shorten the communication preparation may be selected according to any criterion.

[0035] Also, when the terminal device 102 transmits an SR using PUCCH format X, a transmission permission for shortening communication preparation may be used. An example of processing in this case is shown in FIG. 6. In this example of processing, first, the terminal device 102 becomes able to use PUCCH format X in the same manner as in S501 (S601). After that, the terminal device 102 may transmit an SR using PUCCH format X when communication preparation should be shortened, such as when transmitting user data that requires real-time communication (S602). In response to receiving an SR using PUCCH format X, the base station device 101 transmits a transmission permission for a BSR and a transmission permission for user data together during one downlink period in order to shorten the communication preparation time (S603). Then, based on these transmission permissions, the terminal device 102 transmits the BSR and the user data in the frequency / time resources specified in the transmission permission (S604).

[0036] On the other hand, when it is not necessary to shorten the communication preparation, for example, when transmitting user data that does not require real-time communication, the terminal device 102 may transmit an SR using a PUCCH format different from PUCCH format X (S605). In this case, the base station device 101 may determine that it is not necessary to shorten the communication preparation time. In this case, the base station device 101 decides to use a conventional communication procedure, and first transmits a transmission permission for a BSR (S606), and after receiving the BSR from the terminal device 102 (S607), transmits a transmission permission for user data (S608). Then, the terminal device 102 transmits the user data based on the transmission permission (S609).

[0037] In this way, depending on whether PUCCH format X is used for transmitting SR, the base station device 101 can use a transmission permission for shortening communication preparation and a transmission permission for conventional communication preparation. With this, the terminal device 102 can determine whether it is necessary to shorten communication preparation and determine whether to use PUCCH format X based on the determination result. Note that, in the above example, an example has been described in which the necessity of real-time communication is used as a criterion for determining whether it is necessary to shorten communication preparation, but this is not limiting. In other words, whether it is necessary to shorten communication preparation may be determined based on any criterion.

[0038] The invention is not limited to the above-described embodiment, and various modifications and variations are possible within the scope of the gist of the invention.

Claims

1. A base station device, A notification means for notifying a terminal device that has established or is currently connected to the base station device of information indicating a first format of a physical uplink control channel (PUCCH) that can be used for transmitting a scheduling request and can indicate a type of communication; a determination means for determining a type of communication based on whether the scheduling request is received from the terminal device in the first format of the PUCCH or in a second format different from the first format of the PUCCH; a selection means for selecting a type of transmission permission to be transmitted to the terminal device from among a plurality of types of transmission permission based on the identified type of communication; a transmission means for transmitting a transmission permission of the selected type to the terminal device in response to the scheduling request; A base station device comprising:

2. 2. The base station apparatus according to claim 1, wherein the plurality of types of transmission authorizations include a transmission authorization that permits transmission of user data without transmitting a buffer status report.

3. 3. The base station apparatus according to claim 1, wherein the plurality of types of transmission authorizations include a transmission authorization for transmitting a buffer status report and for transmitting user data without waiting for reception of the buffer status report.

4. 4. The base station apparatus according to claim 3, wherein said transmitting means transmits a transmission authorization for a buffer status report and a transmission authorization for user data separately to said terminal apparatus.

5. 4. The base station apparatus according to claim 3, wherein said transmitting means transmits to said terminal apparatus a transmission permission for collectively permitting transmission of a buffer status report and transmission of user data.

6. A terminal device, An acquisition means for acquiring information indicating a first format of a physical uplink control channel (PUCCH) that can be used for transmitting a scheduling request and can indicate a type of communication from a base station device that has established a connection or is currently connected; a communication means for transmitting the scheduling request using the first format of the PUCCH to the base station device when transmitting a signal related to a predetermined type of communication to the base station device, transmitting the scheduling request using a second format different from the first format of the PUCCH when transmitting a signal related to a type of communication different from the predetermined type of communication to the base station device, receiving a transmission permission selected from a plurality of types of transmission permission by the base station device in response to the scheduling request, and transmitting a signal to the base station device based on the transmission permission; A terminal device comprising:

7. 7. The terminal device according to claim 6, wherein the plurality of types of transmission authorizations include a transmission authorization that permits transmission of user data without transmitting a buffer status report.

8. 8. The terminal device according to claim 6, wherein the plurality of types of transmission authorizations include a transmission authorization for transmitting a buffer status report and for transmitting user data without waiting for reception of the buffer status report.

9. A communication method performed by a base station device, comprising: notifying a terminal device that has established or is currently connected to the base station device of information indicating a first format of a physical uplink control channel (PUCCH) that can be used for transmitting a scheduling request and that can indicate a type of communication; Identifying a type of communication by the scheduling request based on whether the scheduling request is received from the terminal device in the first format of the PUCCH or in a second format different from the first format of the PUCCH; selecting a type of transmission authorization to be transmitted to the terminal device from among a plurality of types of transmission authorization based on the identified type of communication; transmitting a transmission grant of the selected type to the terminal device in response to the scheduling request; A communication method comprising:

10. A communication method performed by a terminal device, comprising: obtaining information indicating a first format of a physical uplink control channel (PUCCH) that is usable for transmitting a scheduling request and that can indicate a type of communication from a base station device that is to establish or is currently connected; transmitting, to the base station device, the scheduling request using the first format of the PUCCH when transmitting a signal related to a predetermined type of communication to the base station device; transmitting the scheduling request using a second format different from the first format of the PUCCH when transmitting a signal related to a type of communication different from the predetermined type of communication to the base station device; receiving a transmission grant selected from a plurality of types of transmission grants by the base station device in response to the scheduling request; Transmitting a signal to the base station device based on the transmission permission; A communication method comprising:

11. A computer installed in the base station device notifying a terminal device that has established or is currently connected to the base station device of information indicating a first format of a physical uplink control channel (PUCCH) that can be used for transmitting a scheduling request and that can indicate a type of communication; identifying a type of communication by the scheduling request based on whether the scheduling request is received from the terminal device in the first format of the PUCCH or in a second format different from the first format of the PUCCH; selecting a type of transmission permission to be transmitted to the terminal device from among a plurality of types of transmission permission based on the identified type of communication; Program for.

12. A computer installed in the terminal device obtain, from a base station device that is to establish or is currently connected, information indicating a first format of a physical uplink control channel (PUCCH) that can be used for transmitting a scheduling request and that can indicate a type of communication; When transmitting a signal related to a predetermined type of communication to the base station device, the scheduling request using the first format of the PUCCH is transmitted to the base station device; causing the base station device to transmit the scheduling request using a second format different from the first format of the PUCCH when transmitting a signal related to a type of communication different from the predetermined type of communication to the base station device; receiving a transmission grant selected from a plurality of types of transmission grants by the base station device in response to the scheduling request; causing the base station device to transmit a signal based on the transmission permission; Program for.

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