Technical field
[0001]
　The present invention relates to terminal equipment, base station equipment, wireless communication systems and scheduling request methods.
Background technology
[0002]
　In today's networks, the traffic of mobile terminals (smartphones and feature phones) occupies most of the network resources. In addition, the traffic used by mobile terminals tends to increase in the future.
[0003]
　On the other hand, in line with the development of IoT (Internet of a things) services (for example, monitoring systems for transportation systems, smart meters, devices, etc.), it is required to support services with various requirements. Therefore, in the communication standard of the 5th generation mobile communication (5G or NR (New Radio)), in addition to the standard technology of 4G (4th generation mobile communication) (for example, Non-Patent Documents 1 to 11), the communication standard is further higher. There is a demand for technology that realizes higher data rates, larger capacities, and lower delays. Regarding the 5th generation communication standard, technical studies are underway in the 3GPP working group (for example, TSG-RAN WG1, TSG-RAN WG2, etc.). (Non-Patent Documents 12 to 39). Currently, the first edition of the 5G standard specifications specified by 3GPP has been released.
[0004]
　As mentioned above, in order to support a wide variety of services, 5G has many uses classified into eMBB (Enhanced Mobile BroadBand), Massive MTC (Machine Type Communications) and URLLC (Ultra-Reliable and Low Latency Communication). Case support is expected.
[0005]
　In wireless networks, wireless resources need to be allocated for terminals to transmit data. Therefore, the terminal device executes the scheduling request procedure for the connected base station device. When the PUCCH (Physical Uplink Control CHannel) resource is allocated to transmit the scheduling request (SR), the terminal device transmits the SR using the PUCCH resource. That is, PUCCH is used as the transmission channel of SR.
[0006]
　The base station device that has received the SR gives a UL grant (UL grant) for transmission of the uplink by the terminal device. When the terminal device receives the UL grant, the terminal device reports the amount of data stored in the data buffer to the base station device. This report is sometimes called BSR (Buffer Status Report). The base station device that receives the BSR grasps the amount of data accumulated in the data buffer of the terminal device, allocates an appropriate amount of uplink radio resources to the terminal device, and sends a UL grant that notifies this radio resource to the terminal device. Send. As a result, the terminal device transmits the uplink data to the base station device using the notified radio resource. The above procedure is sometimes referred to as SR PUCCH.
[0007]
　On the other hand, when the PUCCH resource is insufficient, the base station device may not allocate the PUCCH resource for SR to the terminal device. In this case, the terminal device needs to perform a random access (RA) procedure in order to transmit uplink data. In the RA procedure, four signals are transmitted and received between the terminal device and the base station device. Specifically, the following messages are sent and received.
[0008]
　Msg1 (from terminal equipment to base station equipment): Includes random access preamble. RACH (Random Access CHannel) is used as the channel.
[0009]
　Msg2 (from base station device to terminal device): Includes random access response. PDSCH (Physical Downlink Shared CHannel) is used as the channel. The information transmitted includes the identification information of the random access preamble in Msg1 received by the base station apparatus and the UL grant for the next message transmitted on the uplink.
[0010]
　Msg3 (from terminal equipment to base station equipment): PUSCH (Phisical Uplink Shared CHannel) is used as the channel. The radio resource for transmitting Msg3 is notified by the UL grant of Msg2. In addition, the identifier of the terminal device is transmitted by Msg3. As a result, the base station device that receives Msg3 can identify the terminal device that is performing the RA procedure.
[0011]
　Msg4 (from base station equipment to terminal equipment): Includes UL grants. The terminal device that receives this UL grant determines that the RA procedure has been successful.
[0012]
　If the RA procedure is successful, the terminal device uses the UL grant of Msg4 to transmit the BSR and allocates the appropriate amount of uplink radio resources to the base station device, as in the case of SR PUCCH. Receive from and send uplink data. The above procedure is sometimes referred to as SR RACH.
[0013]
　Regarding the SR RACH cancellation procedure, the UL grant is assigned to the C-RNTI (Cell-Radio Network Temporary Identifier), and the MAC (Media Access Control) PDU (Protocol Data Unit) transmitted by the PUSCH is the terminal device. It is considered to cancel the above procedure when the BSR reflecting the latest buffer state (data retention state) of the above is included (Non-Patent Documents 21 and 39).
Prior art literature
Non-patent literature
[0014]
Non-Patent Document 1: 3GPP TS 36.211 V15.1.0 (2018-03)
Non-Patent Document 2: 3GPP TS 36.212 V15.1.0 (2018-03)
Non-Patent Document 3: 3GPP TS 36.213 V15.1.0 (2018-03)
Non-Patent Document 4: 3GPP TS 36.300 V15.1.0 (2018-03)
Non-Patent Document 5: 3GPP TS 36.321 V15.1.0 (2018-03)
Non-Patent Document 6: 3GPP TS 36.322 V15.0.1 (2018-04)
Non-Patent Document 7 : 3GPP TS 36.323 V14.5.0 (2017-12)
Non-Patent Document 8: 3GPP TS 36.331 V15.1.0 (2018-03)
Non-Patent Document 9: 3GPP TS 36.413 V15.1.0 (2018-03)
Non-Patent Document 10: 3GPP TS 36.423 V15.1.0 (2018-03)
Non-Patent Document 11: 3GPP TS 36.425 V14.1.0 (2018-03)
Non-Patent Document 12: 3GPP TS 37.340 V15.1.0 (2018-03)
Non-Patent Document 13: 3GPP TS 38.201 V15.0.0 (2017-12)
Non-Patent Document 14: 3GPP TS 38.202 V15.1.0 (2018-03)
Non-Patent Document 15: 3GPP TS 38.211 V15.1.0 (2018-03)
Non-Patent Document 16: 3GPP TS 38.212 V15.1.1 (2018-04)
Non -Patent Document Document 17: 3GPP TS 38.213 V15.1.0 (2018-03)
Non-Patent Document 18: 3GPP TS 38.214 V15.1.0 (2018-03)
Non-Patent Document 19: 3GPP TS 38.215 V15.1.0 (2018-03)
Non-Patent Document 20 : 3GPP TS 38.300 V15.1.0 (2018-03)
Non-Patent Document 21: 3GPP TS 38.321 V15.1.0 (2018-03)
Non-Patent Document 22: 3GPP TS 38.322 V15.1.0 (2018-03)
Non-Patent Document 23: 3GPP TS 38.323 V15.1.0 (2018-03)
Non-Patent Document 24: 3GPP TS 38.331 V15.1.0 (2018-03)
Non-Patent Document 25: 3GPP TS 38.401 V15.1.0 (2018-03)
Non-Patent Document 26: 3GPP TS 38.410 V0.9.0 (2018-04)
Non-Patent Document 27: 3GPP TS 38.413 V0.8.0 (2018-04)
Non-Patent Document 28: 3GPP TS 38.420 V0.8.0 (2018-04)
Non-Patent Document 29: 3GPP TS 38.423 V0.8.0 (2018-04)
Non -Patent Document Document 30: 3GPP TS 38.470 V15.1.0 (2018-03)
Non-Patent Document 31: 3GPP TS 38.473 V15.1.1 (2018-04)
Non-Patent Document 32: 3GPP TR 38.801 V14.0.0 (2017-04)
Non-Patent Document 33 : 3GPP TR 38.802 V14.2.0 (2017-09)
Non-Patent Document 34: 3GPP TR 38.803 V14.2.0 (2017-09)
Non-Patent Document 35: 3GPP TR 38.804 V14.0.0 (2017-03)
Non-Patent Document 36: 3GPP TR 38.900 V14.3.1 (2017-07)
Non-Patent Document 37: 3GPP TR 38.912 V14.1.0 (2017-06)
Non-Patent Document 38: 3GPP TR 38.913 V14.3.0 (2017-06)
Non-Patent Document 39: R2-1804572, "Miscellaneous corrections", 3GPP TSG RAN WG2 Meeting # 101bis, Sanya, China, 16-20 April 2018
Outline of the invention
Problems to be solved by the invention
[0015]
　However, the SR RACH cancellation procedure currently under consideration has a problem that it is unclear whether or not to cancel. Specifically, in scheduling in which periodic radio resources are allocated, such as SPS (Semi-Persistent Scheduling) in LTE-A (Long Term Evolution-Advanced), the terminal device is a UL grant from the base station device. It may be possible to transmit BSR without receiving. That is, the terminal device may transmit the BSR by using the wireless resource of the uplink allocated in advance. In such a case, the SR RACH is not canceled because the BSR is not transmitted using the UL grant. Therefore, even though the BSR has already been transmitted, the SR RACH procedure for transmitting the BSR is continued, and wasteful processing occurs.
[0016]
　The technique disclosed is made in view of such a point, and an object thereof is to provide a terminal device, a base station device, a wireless communication system, and a scheduling request method capable of appropriately canceling a random access procedure. ..
Means to solve problems
[0017]
　In one embodiment, the terminal device disclosed in the present application transmits a buffer state report that generates a buffer state report indicating the amount of data retained in the transmission buffer of the own device and the buffer state report when requesting data transmission. Random access procedure being executed by the transmission control unit when the buffer status report is transmitted using the transmission control unit that executes the random access procedure for the purpose and the first radio resource allocated in advance to the own device. The cancel control unit has a cancel control unit capable of canceling the above-mentioned random access when the buffer state report is transmitted using the second radio resource provided by the random access procedure. Do not cancel the procedure.
Effect of the invention
[0018]
　According to one aspect of the terminal device, the base station device, the wireless communication system, and the scheduling request method disclosed in the present application, there is an effect that the random access procedure can be appropriately canceled.
A brief description of the drawing
[0019]
FIG. 1 is a block diagram showing a configuration of a terminal device according to an embodiment.
FIG. 2 is a block diagram showing a configuration of a base station apparatus according to an embodiment.
FIG. 3 is a sequence diagram showing a specific example of a scheduling request.
FIG. 4 is a sequence diagram showing another specific example of a scheduling request.
FIG. 5 is a diagram showing an example of description of the contents according to one embodiment in a standard specification.
Mode for carrying out the invention
[0020]
　Hereinafter, an embodiment of the terminal device, the base station device, the wireless communication system, and the scheduling request method disclosed in the present application will be described in detail with reference to the drawings. The present invention is not limited to this embodiment.
[0021]
　FIG. 1 is a block diagram showing a configuration of a terminal device 100 according to an embodiment. The terminal device 100 shown in FIG. 1 includes a processor 110, a memory 120, and a wireless communication unit 130.
[0022]
　The processor 110 includes, for example, a CPU (Central Processing Unit), an FPGA (Field Programmable Gate Array), a DSP (Digital Signal Processor), or the like, and controls the entire terminal device 100 in an integrated manner. Specifically, the processor 110 includes a BSR (Buffer Status Report) generation unit 111, a UL (UpLink) transmission control unit 112, and a cancellation control unit 113.
[0023]
　When executing the scheduling request requesting the transmission of the uplink, the BSR generation unit 111 refers to the transmission buffer of the terminal device 100 and grasps the amount of data to be transmitted by the uplink. That is, the BSR generation unit 111 grasps the data retention amount of the transmission buffer of the terminal device 100. Then, the BSR generation unit 111 generates a buffer state report (BSR) for reporting the amount of data retention.
[0024]
　The UL transmission control unit 112 controls transmission of an uplink (UpLink) from the terminal device 100 to the base station device. Specifically, the UL transmission control unit 112 determines whether or not the PUCCH radio resource for the scheduling request is allocated to the terminal device 100 in advance when executing the scheduling request requesting the transmission of the uplink. To do. Then, when the radio resource of the PUCCH is allocated, the UL transmission control unit 112 causes the wireless communication unit 130 to transmit a scheduling request using the radio resource of the allocated PUCCH. Further, for example, when a periodic radio resource is allocated to the terminal device 100 in advance, the UL transmission control unit 112 uses this radio resource to wirelessly transmit the scheduling request and the BSR generated by the BSR generation unit 111. It may be transmitted from the communication unit 130.
[0025]
　On the other hand, when the PUCCH radio resource is not allocated, the UL transmission control unit 112 executes a scheduling request according to a random access procedure to send and receive various messages. Specifically, the UL transmission control unit 112 uses a RACH (Random Access CHannel) to transmit a random access preamble from the wireless communication unit 130. Then, when the UL transmission control unit 112 receives the random access response including the identification information of the random access preamble transmitted from the terminal device 100 and the UL grant, the UL transmission control unit 112 receives the PUSCH (Physical Uplink Shared CHannel) assigned by the UL grant. Is used to transmit the identification information of the terminal device 100 from the wireless communication unit 130. After that, when the UL grant indicating that the random access procedure is successful is received, the UL transmission control unit 112 causes the wireless communication unit 130 to transmit the BSR generated by the BSR generation unit 111.
[0026]
　The UL transmission control unit 112 notifies the cancellation control unit 113 of the message transmitted / received in the random access procedure. Then, when the cancellation control unit 113 instructs to cancel the random access procedure, the running random access procedure is canceled.
[0027]
　The cancellation control unit 113 determines whether or not to cancel the random access procedure executed at the time of the scheduling request, based on the content of the message sent and received in the random access procedure and the allocation status of the radio resource to the terminal device 100. Specifically, the cancellation control unit 113 cancels the running random access procedure when the BSR is transmitted using the radio resource allocated in advance to the terminal device 100 during the execution of the random access procedure. .. That is, in the cancellation control unit 113, for example, when a periodic radio resource is assigned to the terminal device 100 and a BSR is transmitted using this radio resource, the random access procedure is performed even if the UL grant is not received. To cancel.
[0028]
　Further, the cancellation control unit 113 determines that the random access procedure is continued without being canceled when the BSR is transmitted in response to the UL grant included in the random access response, for example, during the execution of the random access procedure. That is, when the BSR is transmitted together with the identification information of the terminal device 100 according to the UL grant received in the middle of the random access procedure, the cancellation control unit 113 continues the random access procedure and the last UL grant. Complete the reception of.
[0029]
　The memory 120 includes, for example, a RAM (Random Access Memory) or a ROM (Read Only Memory), and stores information used by the processor 110 to execute processing.
[0030]
　The wireless communication unit 130 performs wireless transmission processing such as D / A (Digital / Analog) conversion and up-conversion on the transmission data generated by the processor 110, and wirelessly transmits the transmission data via the antenna. Further, the wireless communication unit 130 performs wireless reception processing such as down-conversion and A / D (Analog / Digital) conversion on the received data wirelessly received via the antenna, and outputs the received data to the processor 110.
[0031]
　FIG. 2 is a block diagram showing a configuration of the base station apparatus 200 according to the embodiment. The base station apparatus 200 shown in FIG. 2 includes a wireless communication unit 210, a processor 220, a memory 230, and a network IF (Interface) unit 240.
[0032]
　The wireless communication unit 210 performs wireless reception processing such as down-conversion and A / D conversion on the received data wirelessly received via the antenna, and outputs the received data to the processor 220. Further, the wireless communication unit 210 performs wireless transmission processing such as D / A conversion and up-conversion on the transmission data generated by the processor 220, and wirelessly transmits the transmission data via the antenna.
[0033]
　The processor 220 includes, for example, a CPU, FPGA, DSP, or the like, and controls the entire base station apparatus 200 in an integrated manner. Specifically, the processor 220 has a scheduling unit 221 and an RA (Random Access) processing unit 222 and a cancellation control unit 223.
[0034]
　The scheduling unit 221 executes scheduling for allocating uplink radio resources to the terminal device 100 when a scheduling request is transmitted from the terminal device 100. Specifically, the scheduling unit 221 acquires the BSR transmitted from the terminal device 100, and determines the radio resource for transmitting the data retained in the transmission buffer of the terminal device 100.
[0035]
　The RA processing unit 222 executes random access processing for transmitting and receiving various messages when the scheduling request by the terminal device 100 is executed by the random access procedure. Specifically, when the random access preamble is received, the RA processing unit 222 adds identification information to the random access preamble, and UL grant indicating the identification information and the radio resource for transmitting the message of the next uplink. A random access response including and is transmitted from the wireless communication unit 210. Then, when the identification information of the terminal device 100 is received, the RA processing unit 222 causes the wireless communication unit 210 to transmit a UL grant indicating the radio resources allocated to the terminal device 100 by the scheduling unit 221.
[0036]
　The cancellation control unit 223 determines whether or not to cancel the random access procedure executed at the time of the scheduling request, based on the content of the message sent and received in the random access procedure and the allocation status of the radio resource to the terminal device 100. Specifically, the cancel control unit 223 performs the random access process being executed by the RA processing unit 222 when the BSR is received by the radio resource allocated in advance to the terminal device 100 during the execution of the random access procedure. To cancel. That is, the cancellation control unit 223 cancels the random access process regardless of whether the UL grant is transmitted or not, for example, when a periodic radio resource is assigned to the terminal device 100 and the BSR is received by this radio resource. Let me.
[0037]
　Further, the cancellation control unit 223 determines that the random access procedure is continued without being canceled when the BSR is received in response to the UL grant included in the random access response, for example, during the execution of the random access procedure. That is, the cancel control unit 223 continues the random access procedure when the BSR is received together with the identification information of the terminal device 100 according to the UL grant received in the middle of the random access procedure, and the last UL grant. Complete the transmission of.
[0038]
　The memory 230 includes, for example, a RAM or a ROM, and stores information used by the processor 220 to execute processing.
[0039]
　The network IF unit 240 is, for example, an interface that is wiredly connected to devices constituting the core network.
[0040]
　Next, a specific example of the scheduling request in the wireless communication system having the terminal device 100 and the base station device 200 configured as described above will be described with reference to FIGS. 3 and 4. FIG. 3 is a sequence diagram showing a specific example of the scheduling request executed by the random access procedure.
[0041]
　In the wireless communication system shown in FIG. 3, before the scheduling request is executed, the base station apparatus 200 allocates periodic wireless resources to the terminal apparatus 100 in advance, and the terminal apparatus 100 can be used for uplink transmission. The wireless resource is notified to the terminal device 100 (step S101). Therefore, the terminal device 100 can execute the transmission of the uplink by using the periodic radio resource allocated in advance even if the explicit UL grant is not received. However, since the periodic radio resources allocated in advance are limited, the terminal device 100 receives a scheduling request using PUCCH or RACH when data to be transmitted using the uplink is generated. Requests uplink scheduling from the base station apparatus 200. Here, the description will be continued assuming that the scheduling request is executed by the random access procedure using RACH.
[0042]
　In the random access procedure, the terminal device 100 transmits the random access preamble to the base station device 200 (step S102). Upon receiving the random access preamble, the base station apparatus 200 assigns identification information to the random access preamble, and includes a random access response including the identification information and a UL grant indicating a radio resource available for transmission of the next uplink. Is transmitted to the terminal device 100 (step S103).
[0043]
　By the way, while the random access procedure is being executed, when the transmission timing of the periodic radio resource allocated to the terminal device 100 arrives in advance, the terminal device 100 periodically starts the transmission of the uplink at an early stage. BSR may be transmitted using a typical radio resource (step S104). The transmission of this BSR does not correspond to the UL grant included in the random access response, and may occur even before the random access response is received by the terminal device 100. That is, the terminal device 100 may transmit the BSR at an early stage by using the radio resource allocated in advance regardless of whether the UL grant is received or not.
[0044]
　When the BSR is transmitted, the cancellation control unit 113 of the terminal device 100 determines whether or not to cancel the random access procedure (step S105). Similarly, the cancellation control unit 223 of the base station apparatus 200 also determines whether or not to cancel the random access processing by the RA processing unit 222 (step S105). In the cancellation determination here, the random access procedure is canceled when the BSR is transmitted according to the UL grant or when the BSR is transmitted using the periodic radio resource allocated to the terminal device 100 in advance. Then it is judged. That is, the random access procedure is canceled not only when the BSR is transmitted according to the UL grant but also when the BSR is transmitted by the radio resource allocated in advance regardless of the presence or absence of the UL grant.
[0045]
　After the random access procedure is canceled, the UL transmission control unit 112 stops transmitting and receiving the random access procedure message in the terminal device 100, and the base station device 200 stops the transmission and reception of the random access procedure message by the RA processing unit 222. Sending and receiving is stopped. As a result, it is possible to prevent the random access procedure from being unnecessarily continued after the BSR is transmitted from the terminal device 100 and the scheduling by the base station device 200 becomes executable. In other words, the random access procedure can be canceled appropriately.
[0046]
　FIG. 4 is a sequence diagram showing another specific example of the scheduling request executed by the random access procedure. In FIG. 4, the same parts as those in FIG. 3 are designated by the same reference numerals.
[0047]
　In the wireless communication system shown in FIG. 4, unlike FIG. 3, periodic wireless resources are not allocated to the terminal device 100 in advance. Therefore, when data to be transmitted using the uplink is generated, the terminal device 100 requests the base station apparatus 200 to schedule the uplink by a scheduling request using PUCCH or RACH. Here, the description will be continued assuming that the scheduling request is executed by the random access procedure using RACH.
[0048]
　In the random access procedure, the terminal device 100 transmits the random access preamble to the base station device 200 (step S102). Upon receiving the random access preamble, the base station apparatus 200 assigns identification information to the random access preamble, and includes a random access response including the identification information and a UL grant indicating a radio resource available for transmission of the next uplink. Is transmitted to the terminal device 100 (step S103).
[0049]
　The terminal device 100 that has received the random access response transmits the identification information of the terminal device 100 to the base station device 200 according to the UL grant included in the random access response (step S201). At this time, the terminal device 100 may transmit the BSR together with the identification information of the terminal device 100 in order to start the transmission of the uplink at an early stage.
[0050]
　When the BSR is transmitted, the cancellation control unit 113 of the terminal device 100 determines whether or not to cancel the random access procedure (step S105). Similarly, the cancellation control unit 223 of the base station apparatus 200 also determines whether or not to cancel the random access processing by the RA processing unit 222 (step S105). In the cancellation determination here, when the BSR is transmitted according to the UL grant, it is determined that the random access procedure is canceled, but when the BSR is transmitted according to the UL grant included in the random access response. Is determined to continue without canceling the random access procedure. That is, the random access procedure is canceled except when the BSR is transmitted according to the UL grant and the BSR is transmitted according to the UL grant included in the random access response.
[0051]
　When the BSR is transmitted according to the UL grant included in the random access response, the random access procedure is continued, so that the base station apparatus 200 transmits the UL grant that allows the terminal apparatus 100 to transmit the uplink. (Step S202), the random access procedure is completed. Since the UL grant transmitted here specifies the radio resources that the terminal device 100 can use for the transmission of the uplink, the terminal device 100 may start the transmission of the data accumulated in the transmission buffer at an early stage. it can. Further, after the random access procedure is completed, the base station apparatus 200 executes scheduling according to the BSR, and the UL grant is transmitted to the terminal apparatus 100.
[0052]
　As described above, according to the present embodiment, when the scheduling request is executed by the random access procedure, the buffer status report is transmitted according to the UL grant other than the random access response, and the UL grant. Cancels the random access procedure when a buffer status report is sent by a pre-allocated periodic radio resource, with or without it. Therefore, when the buffer status report used for uplink scheduling is transmitted regardless of the presence or absence of UL grant, it is possible to prevent the random access procedure for transmitting the buffer status report from being unnecessarily executed. can do. In other words, the random access procedure can be canceled appropriately.
[0053]
　Further, when the buffer status report is transmitted according to the UL grant included in the random access response, the random access procedure is continued without being canceled. Therefore, the UL grant transmitted according to the random access procedure is excluded from the condition for canceling the random access procedure, and it is possible to prevent the cancellation of the excessive random access procedure.
[0054]
　Note that canceling the random access procedure may be paraphrased as, for example, stopping the pending scheduling request. Also, the cancellation of the random access procedure is performed, for example, by the MAC entity. Specifically, the MAC PDU is transmitted using a UL grant (eg, a second UL grant) other than the UL grant (eg, the first UL grant) provided (or will be provided) by the random access process. If the MAC entity is a random access procedure initiated by the MAC entity prior to configuring the MAC PDU, with no valid PUCCH resources configured, ongoing random access for pending scheduling requests. The procedure can be stopped.
[0055]
　Further, as for the content according to the above-described embodiment, for example, the item of the scheduling request described in Non-Patent Document 21 (TS38.321) can be updated as shown in FIG. 5, for example.
[0056]
　Further, the cancellation (stop) of the random access procedure may be performed in any state of the random access procedure. For example, the cancellation of the random access procedure may be executed depending on whether or not the random access response is transmitted from the base station device 200 to the terminal device 100. Specifically, when the random access response is sent, the random access procedure is continued (not canceled), and when the random access response is not sent, the random access procedure is canceled. Further, when the terminal device 100 does not receive the random access response (when it does not receive the random access response for a predetermined time or when it receives another random access response), the terminal device 100 processes as if the random access procedure has been cancelled.
Description of the sign
[0057]
　110, 220 　Processor
　111 BSR generation unit
　112 UL transmission control unit
　112 Transmission control unit
113, 223 Cancel control unit
　120, 230 Memory
　130, 210 Wireless communication unit
　221 Scheduling unit
　222 RA processing unit
　240 Network IF unit
The scope of the claims
[Claim 1]
　When requesting data transmission, a generation unit that generates a buffer status report indicating the amount of data retained in the transmission buffer of the own device,
　a transmission control unit that executes a random access procedure for transmitting the buffer status report, and a transmission control unit.
　It has a cancel control unit that can cancel the random access procedure being executed by the transmission control unit when the buffer status report is transmitted using the first radio resource allocated in advance to the own device. and,
　the cancel control unit,
　when the buffer status report is transmitted using the second radio resources provided by the random access procedure, do not cancel the random access procedure
　terminal apparatus characterized by.
[Claim 2]
　The terminal device according to claim 1, wherein the radio resource is a radio resource different from the radio resource allocated in the random access procedure.
[Claim 3]
　The cancellation control unit is characterized
　in that when the buffer status report is transmitted in response to a UL (UpLink) grant that permits transmission of an uplink, the random access procedure being executed by the transmission control unit is canceled. The terminal device according to claim 1 or 2.
[Claim 4]
　A claim characterized by the cancellation control unit
　continuing the random access procedure being executed by the transmission control unit when the buffer status report is transmitted in response to the UL grant received in the random access procedure. Item 3. The terminal device according to item 3.
[Claim 5]
　A random access processing unit that executes a random access procedure for receiving a buffer status report indicating the amount of data retained in the transmission buffer of the terminal device in response to a request from the
　terminal device, and a first assigned to the terminal device in advance. if the buffer status report in one of the radio resource is received, and a said random access processing canceling controller capable of canceling the random access procedure during execution by the unit,
　the cancel control unit,
　the
　A base station apparatus that does not cancel the random access procedure when the buffer status report is received on the second radio resource provided by the random access procedure .
[Claim 6]
　The base station apparatus according to claim 5, wherein the radio resource is a radio resource different from the radio resource allocated in the random access procedure.
[Claim 7]
　The cancellation control unit cancels
　the random access procedure being executed by the random access processing unit when the buffer status report is received in response to a UL (UpLink) grant that permits transmission of an uplink. The base station apparatus according to claim 5 or 6.
[Claim 8]
　The cancellation control unit is characterized
　in that when the buffer status report is received in response to the UL grant transmitted in the random access procedure, the random access procedure being executed by the random access processing unit is continued. 7. The base station apparatus according to claim 7.
[Claim 9]
　A wireless communication system including a terminal device and a base station device,
　wherein the terminal device includes
　a generation unit that generates a buffer state report indicating the amount of data retained in the transmission buffer of the own device when requesting data transmission. , The
　transmission control when the
　buffer status report is transmitted using the transmission control unit that executes the random access procedure for transmitting the buffer status report and the first radio resource allocated in advance to the own device. The
　base station apparatus has a first cancel control unit that cancels the random access procedure being executed by the unit, and the base station apparatus
　receives the buffer status report in response to a request from the terminal apparatus. A random access processing unit that executes the
　above, and a second cancel control unit that cancels the random access procedure being executed by the random access processing unit when the buffer status report is received in the first radio resource. a,
　the first canceling controller and the second cancellation control unit,
　when said buffer status report are transmitted and received using the second wireless resource provided by the random access procedure, the random access procedure
　A wireless communication system characterized by not canceling .
[Claim 10]
　A scheduling request method executed by a
　terminal device for generating a buffer status report indicating the amount of data retained in the transmission buffer of the terminal device and transmitting the buffer status report when requesting data transmission
　. perform the random access procedure,
　the if the buffer status report using a first radio resource allocated in advance to the terminal device is transmitted, has a process of canceling the random access procedure during execution,
　the cancel The processing is 　a scheduling request method, characterized in that the
　random access procedure is not canceled when the buffer state report is transmitted using the second radio resource provided by the random access procedure