WO2020194894A1

WO2020194894A1 - Terminal device for setting parameter in random access procedure, base station device, communication method, and program

Info

Publication number: WO2020194894A1
Application number: PCT/JP2019/048130
Authority: WO
Inventors: 一生菅野; 大関　武雄; 雅人梅原; 恭宏末柄
Original assignee: Kddi株式会社
Priority date: 2019-03-28
Filing date: 2019-12-09
Publication date: 2020-10-01
Also published as: JP2020162102A

Abstract

Provided is a terminal device that: receives, from a base station, information for setting a parameter of a message to be transmitted when establishing connection with the base station device is tried through a two-step random access procedure, the information being used for setting separately a first parameter for a first portion included in the message and a second parameter for a second portion included in the message; sets the first parameter and the second parameter on the basis of the information; and transmits a message including the first portion based on the first parameter and the second portion based on the second parameter.

Description

Terminal equipment, base station equipment, communication methods, and programs for setting parameters in random access procedures

The present invention relates to a terminal device, a base station device, a communication method, and a program, and specifically, relates to a parameter setting technique in a random access procedure.

In the 5th generation (5G) NR (New Radio) standard by the 3rd generation partnership project, a random access procedure is defined as a procedure for establishing a connection between a base station device and a terminal device. The random access procedure is used, for example, when the base station device and the terminal device are initially connected, or when the terminal device connects to the handover destination base station device at the time of handover. The random access procedure includes a 4-step RACH (Random Access Channel). In the 4-step RACH, the terminal device first transmits a random access preamble (message 1) to the base station device, and the base station device sends a random access response (message 2) to the terminal device in response to the random access preamble. Send. After that, the terminal device transmits an RRC (RadioResourceControl) ConnectionRequest message (message 3) to the base station device, and the base station device transmits an RRCConnectionSetup message (message 4) to the terminal device. In the 4-step RACH, the connection between the base station device and the terminal device is established after the transmission and reception of these four messages are performed.

Non-Patent Document 1 defines a transmission power control method in 4-step RACH. In this transmission power control method, the terminal device first determines the initial transmission power of the message 1 based on the target reception power included in the notification signal transmitted from the base station device and the path loss in the transmission line measured by the own device. decide. Then, if the terminal device does not receive the message 2 which is the response to the message 1 within the predetermined period after transmitting the message 1 with the initial transmission power, the transmission power is equal to the predetermined power width included in the above-mentioned notification signal. Is increased to retransmit the message 1. By repeating this procedure, the base station apparatus can receive the message 1. Further, the transmission power of the message 3 is determined based on the transmission power of the message 1 at the timing when the message 2 is received and the information separately notified. Further, in the message 3, the transmission power is controlled with high accuracy by using the high-precision transmission power control related to the retransmission control. Further, the terminal device adjusts the transmission timing of the message 3 by using the information of the timing advance (TA) included in the message 2. As a result, the reception timing difference with the signal from the other terminal device received in the base station device can be suppressed within a certain range, and as a result, the orthogonality with the signal from the other terminal device is ensured. be able to.

Further, in order to shorten the initial connection time, a 2-step RACH in which the random access procedure is made into 2 steps is being studied (see Non-Patent Document 2). In the two-step RACH, the terminal device transmits a message A including a random access preamble portion corresponding to the message 1 of the four-step RACH and a physical uplink shared channel (PUSCH) portion corresponding to the message 3. Then, the base station apparatus transmits the message B corresponding to the above-mentioned message 2 and message 4. In the two-step RACH, the connection between the base station device and the terminal device is established by such a two-step process.

In 2-step RACH, if parameters such as transmission power and timing of the terminal device are not set appropriately, retransmission due to failure in signal reception, interference with signals from other terminal devices, etc. will occur.

The present invention provides an appropriate parameter setting technique in a terminal device using 2-step RACH.

The terminal device according to one aspect of the present invention is information for setting parameters of a message to be transmitted when trying to connect to the base station device by a two-step random access procedure, and is the first information included in the message. Information used to separately set the first parameter for the portion and the second parameter for the second portion contained in the message is received from the base station apparatus and from the base station apparatus. Based on the received information, the first parameter and the second parameter are set, and the first part and the second parameter generated by using the first parameter are used. The message including the second part is transmitted.

The base station device according to one aspect of the present invention is information for setting parameters of a message transmitted by a terminal device that attempts to connect to the base station device by a two-step random access procedure, and is included in the message. It is configured to notify the terminal device of information used to separately set the first parameter for the first portion and the second parameter for the second portion included in the message. To.

According to the present invention, parameters can be appropriately set in a terminal device using 2-step RACH.

Other features and advantages of the present invention will be clarified by the following description with reference to the accompanying drawings. In the attached drawings, the same or similar configurations are given the same reference numbers.

The accompanying drawings are included in the specification and are used to form a part thereof, show embodiments of the present invention, and explain the principles of the present invention together with the description thereof.
FIG. 1 is a diagram showing a configuration example of a wireless communication network. FIG. 2 is a diagram showing a hardware configuration example of a base station device and a terminal device. FIG. 3 is a diagram showing a functional configuration example of the base station device. FIG. 4 is a diagram showing a functional configuration example of the terminal device. FIG. 5 is a diagram showing an example of the relationship between the path loss and the timing adjustment amount. FIG. 6 is a diagram showing an example of a processing flow executed in the wireless communication network.

Hereinafter, embodiments will be described in detail with reference to the attached drawings. 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 of the plurality of features described in the embodiments may be arbitrarily combined. In addition, the same or similar configuration will be given the same reference number, and duplicate description will be omitted.

(Network configuration)
FIG. 1 shows a configuration example of a wireless communication network according to this embodiment. In one example, the wireless communication network according to the present embodiment stays within the range of the base station device 101 and the cell 103 formed by the base station device 101, and connects to the base station device 101 for communication. It is configured to include a terminal device 102 capable of performing. Although one base station device 101 and one terminal device 102 are shown in FIG. 1, a large number of base station devices and a large number of terminal devices can exist without losing generality.

The terminal device 102 executes a random access procedure in order to establish a connection with the base station device 101. As mentioned above, the random access procedure can be performed by either 4-step RACH or 2-step RACH.

In the 4-step RACH, first, the terminal device 102 transmits a random access preamble (message 1), and the base station device 101 transmits a random access response (message 2) as a response message. At this time, the terminal device 102 receives the notification signal transmitted from the base station device 101, and acquires the target received power information of the message 1 in advance. The target received power is the desired received power of the message 1 in the base station apparatus 101. Then, the terminal device 102 determines the transmission power so that the message 1 reaches the base station device 101 with this target received power based on the path loss of the transmission line between the base station device 101 and the terminal device 102. For example, the terminal device 102 determines P _{Pre_Target} + PL as the initial transmission power when the target reception power is P _{Pre_Target} and the magnitude of the path loss is represented by PL. After that, when the terminal device 102 does not receive the message 2 from the base station device 101 within a predetermined period after the message 1 is transmitted, the transmission power of the message 1 is notified in advance from the base station device 101. The message 1 is retransmitted by increasing the value by Δ. That is, if the transmission power at the time of the first transmission of the message 1 is P, the terminal device 102 sets the transmission power at P + Δ at the first retransmission and the transmission power P + 2Δ at the second retransmission until the message 2 is received. Retransmission of message 1 is repeated. When the transmission power reaches the maximum allowable transmission power of the terminal device 102, the terminal device 102 does not increase the transmission power thereafter. Note that the terminal device 102 may transmit the message 1 by using repeated transmission in which a gain is obtained by transmitting the same data a plurality of times.

In response to receiving the message 2, the terminal device 102 transmits the message 3 (RRC (Radio Resource Control) Connection Request) of the random access procedure. The message 3 is transmitted via the radio resource allocated using the message 2 and can be used to notify the base station apparatus 101 of additional information for establishing a connection. The initial transmission power of the message 3 is the target reception power notified separately from the target reception power of the message 1, the transmission power of the message 1 when the message 2 is received, the modulation method of the message 3, and the sub. Determined based on carrier width, etc. Further, the transmission power of the message 3 is controlled by HARQ (composite automatic repeat request) and transmission power control in a closed loop in retransmission. For example, when the transmission power of the message 3 is small, the base station device 101 notifies the terminal device 102 of an instruction to increase the transmission power, so that the transmission power of the message 3 is appropriately controlled. Further, the terminal device 102 can control the transmission timing of the message 3 according to the timing advance (TA) notified by the message 2. By this transmission timing control, the reception timing difference of the signals received from the plurality of terminal devices received in the base station device is suppressed within a certain size range, and the orthogonality is ensured among the plurality of signals, so that demodulation Etc. can be easily performed. When the base station device 101 receives the message 3 from the terminal device 102, the base station device 101 transmits a message 4 (RRCConnectionSetup) to the terminal device 102 as a response message to the message 3. In the 4-step RACH, the connection between the base station device 101 and the terminal device 102 is established by transmitting and receiving these four messages. After that, the terminal device 102 transmits a message indicating that the connection has been established to the base station device 101, and starts data communication.

On the other hand, in the 2-step RACH, the terminal device 102 transmits a message A including the first part corresponding to the above-mentioned message 1 and the second part corresponding to the message 3. Then, the base station apparatus 101 transmits a message B including a portion corresponding to the above-mentioned message 2 and a portion corresponding to the message 4 as a response message to the message A. In the two-step RACH, the connection between the base station device 101 and the terminal device 102 is established by transmitting and receiving the two messages in this way.

In the present embodiment, the terminal device 102 attempts to establish a connection with the base station device 101 by using the 2-step RACH. In the two-step RACH, since the connection is established only by sending and receiving two messages as described above, the period until the connection is established can be shortened. However, in the 4-step RACH, the timing advance information is notified before the message 3 is transmitted, so that the adjustment of the transmission timing of the message 3 can be appropriately executed. However, in the 2-step RACH, the timing advance information is provided. Therefore, such adjustment cannot be made. Further, as described above, in the 4-step RACH, the transmission power control method of the message 1 and the message 3 is different, and the transmission power control of the message A is performed based on the transmission power control method of either the message 1 or the message 3. , The power of the part corresponding to any message can be too high or too low.

Therefore, the terminal device 102 of the present embodiment has different transmission parameters for each of the first portion corresponding to the message 1 and the second portion corresponding to the message 3 included in one message A. Set. For example, for the first part, the transmission timing is set so as to use the radio resources of the random access channel, and for the second part, for example, the transmission timing shifted by the timing adjustment amount according to the path loss is set. Further, the transmission power for the first part and the transmission power for the second part are set separately.

In order to execute such control, the base station device 101 notifies the terminal device 102 of information for setting the parameter of the message A. Then, the terminal device 102 sets the above-mentioned first parameter and the second parameter based on the above-mentioned information received from the base station device 101, and the first portion generated by using the first parameter. Message A containing the second part and the second part generated using the second parameter is transmitted.

The information notified here sets the first parameter for the first part (corresponding to message 1) and the second parameter for the second part (corresponding to message 3) separately. It can be information used to do so. For example, the first parameter and the second parameter can be transmission power parameters corresponding to the first portion and the second portion, respectively. For example, if the terminal device 102 does not receive the message B from the base station device 101 during a predetermined period after the message A is transmitted, the terminal device 102 retransmits the message A, but the base station device 101 retransmits the message A. At that time, the terminal device 102 can be notified of information about the power width of how much the transmission power is increased. At this time, the base station apparatus 101 has a first amount indicating the power width when increasing the transmission power of the first portion and a second amount indicating the power width when increasing the transmission power of the second portion. Information about the quantity is notified to the terminal device 102. At this time, the base station apparatus 101 may notify the terminal apparatus 102 of information including information indicating the first quantity and information indicating the second quantity. Further, the base station apparatus 101 provides information including information indicating either the first quantity and the second quantity and information indicating the difference between the first quantity and the second quantity in the terminal apparatus 102. You may notify to. Further, for example, the first amount may be the same as the increase width of the power related to the message 1 in the case of the 4-step RACH, and in that case, the base station apparatus 101 has the second amount and the first amount. Only the difference may be notified here. That is, the base station device 101 can notify the terminal device 102 of various information that can identify the first amount and the second amount.

In this case, when the message A is to be retransmitted, the terminal device 102 adds the first amount to the transmission power before the retransmission of the first portion of the message A and retransmits the second portion. A second amount is added to the previous transmission power to generate a message A for retransmission. The initial transmission power of the first portion can be determined in the same manner as the initial transmission power of the message 1 of the 4-step RACH. That is, the initial transmission power _PA1 of the first part is
P _A1 = min {P _max , P _{A1_target} + PL}
Can be determined as Here, P _max is the maximum transmission power of the terminal device 102, _{PA1_target} is the target reception power of the first portion, and PL is a value corresponding to the path loss. In addition, the initial transmission power _PA2 of the second part is
P _A2 = min {P _max , P _{A2_target} + PL + α}
Can be determined as Here, _{PA2_target} is the target received power of the second part, and α is a value determined according to the number of resource blocks used for the transmission of the second part and the modulation method. When the above-mentioned first quantity is Δ ₁ and the second quantity is Δ ₂ , the transmission power of the first portion at the time of retransmission is set as _PA1 + Δ ₁ and at the time of retransmission. The transmission power of the second part is set as _PA2 + Δ ₂ . In this way, since the transmission powers of the first part and the second part are set independently, it is possible to transmit the message A with the power suitable for each part.

In addition, a predetermined value may be used for the target received power of the first part and the second part, and in this case, these target received powers are notified from the base station apparatus 101 to the terminal apparatus 102. It doesn't have to be. On the other hand, the target received powers of the first portion and the second portion may be flexibly set, in which case the base station apparatus 101 notifies the terminal apparatus 102 of these target received powers. For example, the first target received power for the first portion and the second target received power for the second portion are notified from the base station apparatus 101 to the terminal apparatus 102. Further, the information indicating either the first target received power or the second target received power and the information indicating the difference between the first target received power and the second target received power are included in the base station apparatus 101. May notify the terminal device 102. Further, for example, the first target received power may be the same as the target received power related to the message 1 in the case of the 4-step RACH, in which case the base station apparatus 101 has the second target received power and the first target received power. Only the difference from the target received power may be notified here. That is, the base station device 101 can notify the terminal device 102 of various information that can identify the first target received power and the second target received power. According to this, it is possible to set the target reception power for each base station device, for example, based on the signal reception capability of the base station device.

Further, the information notified from the base station device 101 to the terminal device 102 may include information regarding the adjustment amount of the transmission timing for at least the second part. The information regarding the adjustment amount of the transmission timing may be information relating the path loss and the magnitude of the adjustment amount of the transmission timing. That is, since it is expected that the terminal device 102 having a smaller path loss exists closer to the base station device 101, for example, the terminal device 102 having a larger path loss without adjusting the transmission timing is closer to the base station device 101. Is expected to be separated, so the transmission timing is advanced. As a result, the second part is transmitted at an early transmission timing from the terminal device at a position relatively far from the base station device, and the second part is relative as a result of the delay in the transmission line. It can be expected that the base station device will arrive at the same timing as the second part transmitted from the terminal device located at a position close to the base station device. The amount of this timing adjustment may be applied to the first portion. Further, in the information notified from the base station apparatus 101, the timing adjustment amount is a value expressed by an absolute value in units of microseconds or the like (for example, "1 microsecond") or cyclic. It can be expressed by a value expressed with reference to a predetermined length such as a prefix (CP) length, an OFDM symbol length, or a frame length (for example, "1/2 of CP length"). The relationship between the position and the timing adjustment amount may be used. That is, different timing adjustment amounts may be used depending on the position of the terminal device. In this case, the transmission timing is adjusted so that the terminal device farther from the base station device has a faster transmission timing. In addition, the relationship between the path loss / position and the timing adjustment amount can be updated so that it becomes an appropriate value by collecting the value of the timing advance used in the data communication after connection in the past communication. Good. Further, at this time, such an update may be performed for each base station apparatus 101. According to this, the relationship between the path loss / position and the timing adjustment amount can be appropriately determined according to the environment in which the base station apparatus 101 is arranged. Further, for example, the terminal device 102 collects the relationship between the path loss / position estimated in the own device and the timing advance value at the time of past communication, and based on the information, the adjustment amount of the path loss / position and the timing. You may build a database showing the relationship with. Further, the terminal device 102 may acquire information on the path loss and the adjustment amount of the timing from the base station device of the connection destination at the time of the previous communication. Further, the information indicating the relationship between the path loss and the timing adjustment amount may be notified to the terminal device 102 as information for each base station device. The terminal device 102 acquires information indicating the relationship between the path loss and the timing adjustment amount for the base station device in an area where the user stays and communicates frequently, such as home or work. Therefore, it is possible to use an appropriate transmission timing for a base station apparatus having a high connection frequency.

The above information is broadcast by the base station device 101, for example, by SIB (System Information Block) or the like, and is individually notified when, for example, the terminal device 102 connects to the base station device 101 last time and communicates. May be done. In addition, the information notification may be performed in another format.

Subsequently, an example of the configuration and processing flow of the base station device and the terminal device that execute the above-mentioned processing will be described.

(Device configuration)
FIG. 2 shows a hardware configuration example of the base station device and the terminal device according to the present embodiment. The base station device and the terminal device include, in one example, a processor 201, a ROM 202, a RAM 203, a storage device 204, and a communication circuit 205. The processor 201 is a computer including one or more processing circuits such as a general-purpose CPU (central processing unit) and an ASIC (application specific integrated circuit), and is stored in a ROM 202 or a storage device 204. By reading and executing the existing program, the entire processing of the device and each of the above-mentioned processing are executed. The ROM 202 is a read-only memory that stores information such as programs and various parameters related to processing executed by the apparatus. The RAM 203 is a random access memory that functions as a workspace when the processor 201 executes a program and stores temporary information. The storage device 204 is composed of, for example, a detachable external storage device or the like. The communication circuit 205 is composed of, for example, a circuit for wired communication or wireless communication. The base station device may include, for example, a wired communication circuit for communicating with another base station device and a wireless communication circuit for communicating with the terminal device. Further, the terminal device has a wireless communication circuit for communicating with the base station device. Although one communication circuit 205 is shown in FIG. 2, the base station device and the terminal device may have a plurality of communication circuits. For example, the terminal device may further have a communication circuit for communication by wireless LAN, Bluetooth (registered trademark), or the like.

FIG. 3 is a diagram showing a functional configuration example of the base station device. In one example, the base station apparatus includes a communication control unit 301 and an information notification unit 302. The communication control unit 301 controls, for example, wireless communication with the terminal device. In one example, the communication control unit 301 operates according to the NR standard, and is configured to be able to execute the random access procedure as described above. The information notification unit 302 is information for setting the parameter of the message A in the two-step random access procedure, and is the first parameter for the first part corresponding to the message 1 of the four-step RACH and four. The terminal device is notified of the information used to set the second parameter for the second part corresponding to the message 3 of the step RACH separately. As described above, this information can be, for example, at least one of an increase in power at the time of retransmission, a target received power, and a transmission timing value corresponding to a path loss / position. The information notification unit 302 may notify the information by broadcasting, for example, or may individually notify the connected terminal device of the information. When the information is notified to the connected terminal device, the terminal device can use the notified information when executing the connection process again thereafter.

FIG. 4 is a diagram showing a functional configuration example of the terminal device. In one example, the terminal device includes a communication control unit 401, an information acquisition unit 402, a parameter setting unit 403, and a message generation unit 404. The communication control unit 401 controls, for example, wireless communication with the base station apparatus. In one example, the communication control unit 401 operates according to the NR standard, and is configured to be able to execute the random access procedure as described above. The information acquisition unit 402 acquires the above-mentioned information notified from the base station apparatus. That is, the information acquisition unit 402 has a first parameter for the first part corresponding to the message 1 of the 4-step RACH and a second parameter for the second part corresponding to the message 3 of the 4-step RACH. Get the information that can be used to set and. The parameter setting unit 403 sets the parameters (first parameter and second parameter) for the message A based on the information acquired by the information acquisition unit 402. For example, the parameter setting unit 403 sets the initial transmission power corresponding to these parts based on the first target received power corresponding to the first part and the second target received power corresponding to the second part. To do. Further, when the parameter setting unit 403 retransmits the message A, the first portion and the first portion are based on the first power increase amount related to the first part and the second power increase amount related to the second part. Set the transmission power at the time of retransmission for the part 2. Further, the parameter setting unit 403 sets the transmission timing of the second part of the message A based on the information indicating the relationship between the path loss / position and the timing adjustment amount. Further, the parameter setting unit 403 may apply the adjustment of the transmission timing to the first part as well. Here, FIG. 5 shows an example of the relationship between the path loss and the adjustment amount of the transmission timing. As shown in FIG. 5, the larger the path loss, the larger the adjustment amount of the transmission timing is set. That is, it is shown that the terminal device having a large path loss should transmit the second part (and in some cases, the first part) of the message A at a relatively early timing. This is an example, and the adjustment amount of the transmission timing may be defined based on, for example, the CP length, the OFDM symbol length, the frame length, and the like. The message generation unit 404 generates a message A including the first portion and the second portion based on the parameters set by the parameter setting unit 403. Then, the generated message A is transmitted via the communication control unit 401 at a timing based on the timing adjustment amount set by the parameter setting unit 403.

(Processing flow)
Subsequently, an example of the processing flow executed in the wireless communication network will be outlined with reference to FIG. The details described above will not be repeated here, but an outline of the process will be described. In the present embodiment, it is assumed that the base station apparatus 101 periodically transmits the above-mentioned information (referred to as “parameter setting information”) by broadcasting (S601). As described above, the parameter setting information includes the target received power for determining the transmission power for each of the first part and the second part of the message A, the amount of power increase at the time of retransmission, and the path loss / position and timing. Includes information on the relationship with the adjustment amount. In addition, only a part of these may be notified. For example, in a very small cell, when a plurality of terminal devices transmit signals at the same time, it can be assumed that the orthogonality is not broken even if the timing adjustment is not performed. In such a case, the information regarding the timing adjustment amount may be omitted. The terminal device 102 acquires this parameter setting information (S602) and retains the content of the information. Further, the terminal device 102 estimates the path loss in the transmission line between the base station device 101 and the terminal device 102 by using the notification signal such as the parameter setting information and the synchronization signal transmitted from the base station device 101. After that, it is assumed that the terminal device 102 needs to be connected to the base station device 101 due to, for example, paging from the base station device 101 or generation of data to be transmitted in the terminal device 102. Terminal device 102 initiates a random access procedure to establish a connection. Here, it is assumed that the terminal device 102 uses a two-step random access procedure, and a parameter for transmitting the message A is set (S603). Here, the timing adjustment amount as a [Delta] T, the initial transmission power for the first portion and a second portion, and that the P _A1 and P _A2, respectively. It is assumed that both _PA1 and _PA2 do not exceed the maximum transmission power of the terminal device 102. The terminal device 102 generates a message A based on the set parameters (S604). For example, a message A is generated in which the power of the first part is set to _PA1 , the power of the second part is set to _PA2, and the transmission timing of the second part is advanced by ΔT. Then, the terminal device 102 transmits this message A to the base station device 101 (S605).

After transmitting the message A, the terminal device 102 waits for the arrival of the message B, which is a response message from the base station device 101, for a predetermined period of time. Then, the terminal device 102 determines to retransmit the message A if the message B is not received within a predetermined period after the transmission of the message A. At this time, the terminal device 102 resets the parameters so as to increase the transmission power (S606). The amount of increase in transmission power is specified by the parameter setting information. Here, it is assumed that the amount of increase in transmission power for the first part is Δ _A1 and the amount of increase in transmission power for the second part is Δ _A2 . Therefore, the transmission power of the first portion at the time of retransmission is set to _PA1 + Δ _A1, and the transmission power of the second portion is set to _PA2 + Δ _A2 . The terminal device 102 also increases the transmission power by Δ _A1 for the first portion and by Δ A ₂ for the second portion even when retransmission occurs thereafter. The terminal device 102 sets the transmission power of the first portion or the second portion to the maximum transmission power when the value exceeds the maximum transmission power when the transmission power is increased. At this point, the timing adjustment amount may be changed by re-estimating the path loss. After that, the message A is generated again using the changed parameters (S607) and transmitted to the base station apparatus 101 (S608). The processes of S606 to S608 are repeated until the connection between the base station device 101 and the terminal device 102 is established. If the number of times the message A is retransmitted reaches a predetermined number without establishing the connection between the base station device 101 and the terminal device 102, the terminal device 102 determines that the connection has failed, and more than that. Do not retransmit. When the message B is transmitted from the base station device 101 to the message A transmitted by such repetitive processing or the like (S609), the connection between the base station device 101 and the terminal device 102 is established.

As described above, according to the present embodiment, it is possible to handle the parameters of the two parts included in one message (message A) in the two-step random access procedure separately. This makes it possible to set appropriate parameters according to the characteristics of each part in the message.

The present invention is not limited to the above-described embodiment, and various modifications and modifications can be made without departing from the spirit and scope of the present invention. Therefore, in order to make the scope of the present invention public, the following claims are attached.

This application claims priority based on Japanese Patent Application No. 2019-063023 submitted on March 28, 2019, and all the contents thereof are incorporated herein by reference.

Claims

It ’s a terminal device,
Information for setting parameters of a message to be transmitted when trying to connect to a base station device by a two-step random access procedure, the first parameter for the first part included in the message and the above. Information used to set the second parameter for the second part contained in the message separately is received from the base station apparatus.
Based on the information received from the base station apparatus, the first parameter and the second parameter are set.
A terminal device configured to transmit the message including the first portion based on the first parameter and the second portion based on the second parameter.
The information received from the base station device is used when retransmitting the message when the response message is not received from the base station device within a predetermined period after the terminal device transmits the message. The terminal device according to claim 1, further comprising information on a first amount that increases the transmit power of the first portion and a second amount that increases the transmit power of the second portion.
The information received from the base station apparatus includes information indicating the first quantity and information indicating the second quantity, or information indicating the first quantity, the second quantity, and the second quantity. A claim that either includes information indicating a difference of one quantity, or includes information indicating the second quantity and information indicating a difference between the first quantity and the second quantity. 2. The terminal device according to 2.
The first quantity is an quantity specified regardless of the information received from the base station apparatus.
The terminal device according to claim 2, wherein the information received from the base station device includes information indicating a difference between the second amount and the first amount.
The information received from the base station apparatus includes the received power of the first target of the first portion when received by the base station apparatus and the second portion when received by the base station apparatus. The terminal device according to any one of claims 1 to 4, which includes information regarding the received power of the second target.
The information received from the base station apparatus includes information indicating the received power of the first target and information indicating the received power of the second target, or includes information indicating the received power of the first target. , Information indicating the difference between the received power of the second target and the received power of the first target, or the information indicating the received power of the second target, the received power of the first target, and the above. The terminal device according to claim 5, which either includes information indicating a difference in received power of a second target.
The received power of the first target is an amount specified regardless of the information received from the base station apparatus.
The terminal device according to claim 5, wherein the information received from the base station device includes information indicating a difference between the received power of the second target and the received power of the first target.
The information received from the base station apparatus is information regarding an adjustment amount of transmission timing for at least the second portion, and is a path loss in a transmission line between the base station apparatus and the terminal apparatus and the adjustment. The terminal device according to any one of claims 1 to 7, which includes information associated with a quantity.
The terminal device according to claim 8, wherein the adjustment amount is also applied to the first portion.
The first portion comprises a random access preamble, and the second portion comprises a physical uplink shared channel that transmits additional information for establishing a connection, according to any one of claims 1-9. Terminal device.
It ’s a base station device,
Information for setting parameters of a message transmitted by a terminal device that attempts to connect to the base station device by a two-step random access procedure, and is a first parameter for a first part included in the message. A base station device configured to notify the terminal device of information used to separately set the and the second parameter for the second portion included in the message.
A communication method executed by a terminal device
Information for setting parameters of a message to be transmitted when trying to connect to a base station device by a two-step random access procedure, the first parameter for the first part included in the message and the above. Receiving information from the base station apparatus used to set the second parameter for the second part contained in the message separately.
Setting the first parameter and the second parameter based on the information received from the base station apparatus, and setting the second parameter.
To transmit the message including the first part based on the first parameter and the second part based on the second parameter.
Communication methods including.
A communication method performed by a base station device,
Information for setting parameters of a message transmitted by a terminal device that attempts to connect to the base station device by a two-step random access procedure, and is a first parameter for a first part included in the message. A communication method comprising notifying the terminal device of information used to separately set the second parameter for the second portion included in the message and the second parameter.
To the computer installed in the terminal device
Information for setting parameters of a message to be transmitted when trying to connect to a base station device by a two-step random access procedure, the first parameter for the first part included in the message and the above. Information used to set the second parameter for the second part contained in the message separately is received from the base station apparatus.
Based on the information received from the base station apparatus, the first parameter and the second parameter are set.
The message including the first part based on the first parameter and the second part based on the second parameter is transmitted.
Program for.
Information for setting parameters of a message transmitted by a terminal device that attempts to connect to the base station device by a two-step random access procedure to a computer provided in the base station device, and is included in the message. A program for notifying the terminal device of information used for separately setting a first parameter for a part 1 and a second parameter for a second part included in the message.