WO2023012910A1 - Terminal and communication method - Google Patents

Abstract

A terminal equipped with a receiving unit for receiving, in a first band, information pertaining to a second band, and a control unit which uses both a signal in the first band and a signal in the second band, wherein the receiving unit receives a signal in the first band which pertains to random access.

Description

Terminal and communication method

The present invention relates to a terminal and communication method in a wireless communication system.

In the 3GPP (3rd Generation Partnership Project), 5G or NR (New Radio) and NR (New Radio) are being used in order to further increase the system capacity, further increase the data transmission speed, and further reduce the delay in the wireless section. A radio communication system called "NR" (the radio communication system is hereinafter referred to as "NR") is under study. In 5G, various radio technologies and network architectures are being studied in order to meet the requirements of realizing a throughput of 10 Gbps or more and keeping the delay in the radio section to 1 ms or less (for example, Non-Patent Document 1). .

3GPP TS 38.213 V16.3.0 (2020-09)

In future wireless communication systems (for example, after Rel. 17), it is expected that terminals that support various use cases such as IoT will be introduced.

However, it is not clear how UEs with different capabilities/categories use resources. If resources are not properly used, system performance may be degraded, such as a decrease in resource utilization efficiency.

The present invention has been made in view of the above points, and aims to provide technology that enables appropriate use of resources according to ability.

According to the disclosed technique, a receiving unit that receives information about a second band within a first band, and a control unit that uses both the signal within the first band and the signal within the second band and wherein the receiving unit receives the signal of the first band for random access.

According to the disclosed technique, a technique is provided that enables appropriate use of resources according to ability.

1 is a diagram for explaining a radio communication system according to an embodiment of the present invention; FIG. FIG. 4 is a diagram for explaining a situation in which multiple types of terminals coexist; FIG. 4 is a diagram for explaining a baseline channel and an additional channel; FIG. FIG. 10 is a sequence diagram showing an example of the flow of a 4-step random access procedure; FIG. 4 is a sequence diagram showing an example of the flow of a two-step random access procedure; FIG. 4 is a diagram for explaining CBRA by a four-step random access procedure according to the first embodiment; FIG. 4 is a diagram for explaining CBRA by a two-step random access procedure according to the first embodiment; FIG. 2 is a diagram for explaining CFRA according to the first embodiment; FIG. FIG. 4 is a diagram for explaining handover by CFRA according to the first embodiment; FIG. 11 is a first diagram for explaining CBRA by a 4-step random access procedure according to the second embodiment; FIG. 11 is a second diagram for explaining CBRA by a four-step random access procedure according to the second embodiment; FIG. 13 is a third diagram for explaining CBRA by the 4-step random access procedure according to the second embodiment; FIG. 14 is a fourth diagram for explaining CBRA by the 4-step random access procedure according to the second embodiment; FIG. 10 is a first diagram for explaining CBRA by a two-step random access procedure according to the second embodiment; FIG. 12 is a second diagram for explaining CBRA by a two-step random access procedure according to the second embodiment; FIG. 14 is a third diagram for explaining CBRA by a two-step random access procedure according to the second embodiment; FIG. 11 is a first diagram for explaining CFRA according to the second embodiment; FIG. 11 is a second diagram for explaining CFRA according to the second embodiment; FIG. 11 is a third diagram for explaining CFRA according to the second embodiment; It is a figure showing an example of functional composition of base station 10 in an embodiment of the invention. 2 is a diagram showing an example of the functional configuration of terminal 20 according to the embodiment of the present invention; FIG. 2 is a diagram showing an example of hardware configuration of base station 10 or terminal 20 according to an embodiment of the present invention; FIG.

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

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

Existing technologies are appropriately used for the operation of the wireless communication system according to the embodiment of the present invention. The existing technology is, for example, existing NR, but is not limited to existing NR.

In addition, in this specification, terms used in existing NR or LTE specifications such as PDCCH, RRC, MAC, and DCI are used, but channel names, protocol names, signal names used in this specification , function names, etc. may be called by different names.

(System configuration)
FIG. 1 is a diagram for explaining a radio communication system according to an embodiment of the present invention.
A radio communication system according to an embodiment of the present invention includes a base station 10 and a terminal 20, as shown in FIG. Although one base station 10 and one terminal 20 are shown in FIG. 1, this is an example and there may be more than one.

The base station 10 is a communication device that provides one or more cells and performs wireless communication with the terminal 20. A physical resource of a radio signal is defined in the time domain and the frequency domain. The time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. Also, a TTI (Transmission Time Interval) in the time domain may be a slot, or a TTI may be a subframe.

The base station 10 can perform carrier aggregation in which multiple cells (multiple CCs (component carriers)) are bundled and communicated with the terminal 20 . In carrier aggregation, one primary cell (PCell, Primary Cell) and one or more secondary cells (SCell, Secondary Cell) are used.

The base station 10 transmits a synchronization signal, system information, etc. to the terminal 20. Synchronization signals are, for example, NR-PSS and NR-SSS. Also, the synchronization signal may be SSB. The system information is transmitted by, for example, NR-PBCH (Physical Broadcast Channel) or PDSCH (Physical Downlink Shared Channel), and is also called broadcast information. As shown in FIG. 1, the base station 10 transmits control signals or data to the terminal 20 on DL (Downlink) and receives control signals or data from the terminal 20 on UL (Uplink). In addition, here, what is transmitted on control channels such as PUCCH (Physical Uplink Control Channel) and PDCCH (Physical Downlink Control Channel) is called a control signal, and what is transmitted on shared channels such as PUSCH and PDSCH is called data. It is called, but such a way of calling is an example.

The terminal 20 is a communication device with a wireless communication function, such as a smartphone, mobile phone, tablet, wearable terminal, or M2M (Machine-to-Machine) communication module. As shown in FIG. 1 , the terminal 20 receives control signals or data from the base station 10 on the DL and transmits control signals or data to the base station 10 on the UL, thereby performing various functions provided by the wireless communication system. Use communication services. Note that the terminal 20 may be called UE, and the base station 10 may be called gNB.

(Regarding problems of conventional technology)
Next, the problems of the prior art will be explained. In future wireless communication systems/networks (e.g., 6G), for further improvements in communication speed/capacity/reliability/delay performance/multiple connections, etc., and for expansion into new areas such as sensing , 5G, NR, etc. are expected to support a wider variety of use cases/terminals.

In LTE and NR, functions that are reduced from the mandatory functions supported by existing terminals are defined as UE categories/capabilities for IoT (Internet of Things). This UE category/capability is, for example, eMTC (enhanced machine type communication) in LTE, NB (narrow band)-IoT, RedCap (Reduced Capability) in NR. Therefore, it is considered that an additional function is required for compensating for the characteristic deterioration due to the reduction of functions.

FIG. 2 is a diagram for explaining a situation in which multiple types of terminals coexist. As shown in FIG. 2, an existing UE that communicates in a wide band and a short time, an IoT UE that uses a narrower band, a longer time, and repetition, a narrower band, and a smaller Information and sensing UEs using may coexist.

In this way, in future wireless communication systems, if functions are added for each use case/terminal, efficient coexistence with existing UEs may become difficult.

(Overview of this embodiment)
Therefore, in order to deal with such problems in the prior art, in the present embodiment, a baseline channel (first band) that can be received by any UE and an additional channel optimized for a specific UE / service (Second band) and a communication method will be described. By using both the baseline channel and the additional channel, for example, while maintaining the connection using the baseline channel, it is possible to communicate the additionally required resource using the additional channel.

FIG. 3 is a diagram for explaining the baseline channel and the additional channel. Terminal 20 uses both the signal in the baseline channel and the signal in the additional channel. For example, as shown in FIG. 3, terminal 20 receives SSB (a block containing a synchronization signal), transmits RACH (Random Access Channel), receives Msg2, transmits Msg3, and receives Msg4 on the baseline channel. , subsequent PDCCH reception, and/or PUSCH transmission/PDSCH reception scheduled by that PDCCH. Then, the terminal 20 may perform at least one of SSB reception, RACH transmission, subsequent PDCCH reception, and PUSCH transmission/PDSCH reception scheduled by the PDCCH on the additional channel.

By the way, when using both the baseline channel and the additional channel, it is necessary to consider a specific transmission/reception method for the random access procedure. In NR, in addition to the conventionally adopted 4-step random access procedure (hereinafter also referred to as 4-step RA), a 2-step random access procedure with a reduced number of steps for low latency, power consumption, etc. An access procedure (hereinafter also referred to as 2-step RA) is adopted.

(Overview of conventional random access procedure)
An outline of a conventional random access procedure will be described below.

FIG. 4 is a sequence diagram showing an example of the flow of a four-step random access procedure. FIG. 4 shows a random access procedure of CBRA (Contention-based Random Access, Collision-based Random Access). In the case of CFRA (Contention Free Random Access, non-collision type random access), the procedure for transmitting and receiving Msg3 and Msg4 may be omitted.

Note that, as will be described later, the terminal 20 can also execute a random access procedure by selecting an SS/PBCH block (also referred to as an SSB, which may be referred to as a synchronization signal block or a synchronization signal). A random access procedure can also be performed by selecting RS (Channel State Information-Reference Signal).

The base station 10, for example, transmits SSB (or CSI-RS) for each beam, and terminal 20 monitors the SSB (or CSI-RS) of each beam. The terminal 20 selects an SSB (or CSI-RS) whose received power is larger than a predetermined threshold from among a plurality of SSBs (or CSI-RS), and uses a PRACH resource ( PRACH occurrence) is used to transmit Message1 (Msg1 (=RA preamble)) (step S11). Hereinafter, the RA preamble will be called a preamble.

Upon detecting the preamble, the base station 10 transmits Message2 (Msg2 (=RAR; Random Access Response)) as a response to the preamble to the terminal 20 (step S12). The terminal 20 which received Msg2 transmits Message3 (Msg3) including predetermined information to the base station 10 (step S3).

Upon receiving Msg3, the base station 10 transmits Message4 (Msg4) to the terminal 20 (step S4). When the terminal 20 confirms that the predetermined information is included in Msg4, the terminal 20 recognizes that the Msg4 is the Msg4 addressed to itself corresponding to the above Msg3 (Contention resolution: OK).

FIG. 5 is a sequence diagram showing an example of the flow of a two-step random access procedure.

The terminal 20 transmits MessageA (MsgA) including data such as preamble and PUSCH payload to the base station 10 (step S21). As an example, the terminal 20 selects a PRACH resource in the same manner as the selection of the PRACH resource (PRACH occurrence) in 4-step RA, transmits a preamble using the PRACH resource, and uses the PUSCH resource linked to the PRACH resource. Send data. Note that the preamble and data here correspond to, for example, Msg1 and Msg3 in 4-step RA. In 2-step RA, resources for transmitting data are not limited to PUSCH resources, and any channel resources for transmitting data (or control information) may be used.

The base station 10 transmits MessageB (MsgB) to the terminal 20 (step S22). The content of MsgB corresponds to, for example, Msg2 and Msg4 in 4-step RA. Note that MsgB may include a notification indicating fallback. Upon receiving the notification indicating the fallback, the terminal 20 may fall back to the 4-step random access procedure, eg, send Msg3.

Examples 1 and 2 showing specific transmission/reception methods of the random access procedure when the baseline channel and the additional channel according to the present embodiment are used together will be described below.

(Example 1)
This embodiment shows an example in which the terminal 20 transmits and receives a baseline channel signal for random access.

The terminal 20 may transmit HARQ-ACK (Hybrid Automatic Repeat Request - Acknowledgment) for Msg1, Msg3, or Msg4 related to 4-step RA as a baseline channel signal related to random access.

Msg1 is, for example, the baseline channel PRACH (hereinafter referred to as B-PRACH). Msg3 is, for example, the PUSCH of the baseline channel (hereinafter referred to as B-PUSCH). The HARQ-ACK for Msg4 is, for example, the PUCCH of the baseline channel (hereinafter referred to as B-PUCCH).

The terminal 20 may receive Msg2 or Msg4 related to 4-step RA as a baseline channel signal related to random access.

Msg2 is, for example, RAR. The RAR is included in, for example, a baseline channel PDCCH (hereinafter referred to as B-PDCCH) or a baseline channel PDSCH (hereinafter referred to as B-PDSCH). Also, Msg4 is, for example, B-PDCCH or B-PDSCH.

Also, the terminal 20 may transmit HARQ-ACK for MsgA or MsgB for 2-step RA as a baseline channel signal for random access. MsgA is, for example, B-PRACH or B-PUSCH. HARQ-ACK for MsgB is eg B-PUCCH.

The terminal 20 may receive MsgB for 2-step RA as a baseline channel signal for random access.

The terminal 20 may perform a random access procedure by a method (CBRA; Contention based random access) in which B-PRACH transmission is triggered from higher layers.

FIG. 6 is a diagram for explaining CBRA according to the four-step random access procedure according to the first embodiment. The terminal 20 is notified of information related to the B-PDSCH including SIB1 and the B-PDCCH that schedules it by a baseline channel broadcast signal (hereinafter referred to as B-PBCH). Furthermore, the terminal 20 is notified of information related to the B-PRACH in SIB1. After that, it may be triggered by the upper layer of terminal 20 to transmit Msg1 on the B-PRACH.

FIG. 7 is a diagram for explaining CBRA by a two-step random access procedure according to the first embodiment. The terminal 20 is notified of information related to the B-PDSCH including SIB1 and the B-PDCCH that schedules it on the B-PBCH. Furthermore, the terminal 20 is notified of information related to the B-PRACH and B-PUSCH in SIB1. After that, triggered by the upper layer of terminal 20, MsgA may be transmitted in B-PRACH or B-PUSCH.

Also, the terminal 20 may perform a random access procedure by a method (CFRA: Contention free random access) in which B-PRACH transmission is triggered on B-PDCCH.

FIG. 8 is a diagram for explaining CFRA according to the first embodiment. Terminal 20 is triggered to transmit B-PRACH by receiving B-PDCCH.

Also, the terminal 20 may perform a random access procedure for handover.

FIG. 9 is a diagram for explaining handover by CFRA according to the first embodiment. As shown in FIG. 9, in CFRA, the terminal 20 may receive the B-PDCCH that triggers the B-PRACH of the handover destination (post) cell on the baseline channel of the handover source (previous) cell.

The configuration of the baseline channel signal for random access may be specified in the specification, may be configured by higher layer signaling transmitted in the baseline channel or the additional channel, or may be configured in the baseline channel or the additional channel. It may be notified as system information (for example, SIB1) transmitted in.

Here, if the terminal 20 does not make specific settings related to B-PDCCH or B-PDSCH as Msg2, Msg4 or MsgB, it may apply settings related to another B-PDCCH or B-PDSCH. . For example, settings related to B-PDSCH containing system information (eg, SIB1) and B-PDCCH scheduling this may be applied.

The parameters related to the baseline channel signal related to random access may be set in common for the terminals 20 that transmit and receive on the baseline channel.

The baseline channel signal for random access may be receivable by terminals 20 of any type or terminal capability, and may not be receivable by some terminals 20 specified by the specification.

(Example 2)
In this embodiment, an example is shown in which the terminal 20 transmits and receives additional channel signals for random access.

The terminal 20 may receive the signal of the additional channel related to random access when receiving the notification indicating the setting related to the signal of the additional channel related to random access.

Note that the terminal 20 may receive the signal of the additional channel related to random access when receiving a notification indicating the presence of the signal of the additional channel related to random access. In this case, the settings related to the signal of the additional channel related to random access may be defined in the specification.

Further, when terminal 20 receives a notification indicating the absence of the signal of the additional channel for random access, the terminal 20 does not receive the signal of the additional channel for random access, and the signal of the additional channel for random access does not exist. If no notification indicating is received, the signal of the additional channel related to random access may be received. The behavior of the terminal 20 in this case may be defined in specifications.

In addition, when the terminal 20 does not receive a notification indicating the presence or absence of the signal of the additional channel for random access, the terminal 20 may receive the signal for the additional channel for random access, or may receive the signal for the additional channel for random access. signal may not be received. The behavior of the terminal 20 in this case may be defined in specifications.

The terminal 20 may transmit HARQ-ACK for Msg1, Msg3, or Msg4 for 4-step RA as an additional channel signal for random access.

Msg1 is, for example, an additional channel PRACH (hereinafter referred to as A-PRACH). Msg3 is, for example, an additional channel PUSCH (hereinafter referred to as A-PUSCH). HARQ-ACK for Msg4 is, for example, the PUCCH of the additional channel (hereinafter referred to as A-PUCCH).

The terminal 20 may receive Msg2 or Msg4 related to 4-step RA as an additional channel signal related to random access.

Msg2 is, for example, RAR. The RAR is included in, for example, an additional channel PDCCH (hereinafter referred to as A-PDCCH) or an additional channel PDSCH (hereinafter referred to as A-PDSCH). Also, Msg4 is, for example, A-PDCCH or A-PDSCH.

Also, terminal 20 may transmit HARQ-ACK for MsgA or MsgB for 2-step RA as an additional channel signal for random access. MsgA is, for example, A-PRACH or A-PUSCH. HARQ-ACK for MsgB is eg A-PUCCH.

The terminal 20 may receive MsgB related to 2-step RA as an additional channel signal related to random access.

The terminal 20 may perform a random access procedure by a method (CBRA) in which A-PRACH transmission is triggered from higher layers.

FIG. 10 is a first diagram for explaining CBRA according to the 4-step random access procedure according to the second embodiment. The terminal 20 is notified of information related to the A-PDSCH including the SIB1 and the A-PDCCH that schedules it by the broadcast signal of the additional channel (hereinafter referred to as A-PBCH). Further, the terminal 20 is notified of information related to A-PRACH in SIB1. After that, it may be triggered by the upper layer of terminal 20 to transmit Msg1 on the A-PRACH.

The terminal 20 may notify the base station 10 of which RAR to receive, the baseline channel or the additional channel, in the PRACH resource (PRACH occurrence) of Msg1 or preamble. That is, the terminal 20 may transmit to the base station 10 a notification indicating the reception capability of the additional channel.

FIG. 11 is a second diagram for explaining CBRA according to the 4-step random access procedure according to the second embodiment. The terminal 20 may transmit and receive the signal of the random access procedure after receiving Msg2 on the additional channel. For example, the terminal 20 is notified of information related to the B-PDSCH including SIB1 and the B-PDCCH that schedules it on the B-PBCH. Furthermore, the terminal 20 is notified of information related to the B-PRACH in SIB1. After that, it may be triggered by the upper layer of terminal 20 to transmit Msg1 on B-PRACH and attempt to receive RAR during the RAR window period of the additional channel.

In this case, similarly to the case shown in FIG. 10, the terminal 20 uses the PRACH resource (PRACH occurrence) or preamble of Msg1 to inform the base station 10 of which RAR to receive, the baseline channel or the additional channel. may notify you. That is, the terminal 20 may transmit to the base station 10 a notification indicating the reception capability of the additional channel.

Although FIG. 11 shows an example in which the terminal 20 transmits Msg3 on the additional channel (A-PUSCH), the terminal 20 may transmit Msg3 on the baseline channel (B-PUSCH). This allows the terminal 20 to transmit Msg1 and Msg3 on the same channel.

FIG. 12 is a third diagram for explaining CBRA according to the 4-step random access procedure according to the second embodiment. The terminal 20 may transmit and receive the signal of the random access procedure after transmission of Msg3 on the additional channel.

Also, the terminal 20 may be scheduled to transmit Msg3 in either the baseline channel or the additional channel in Msg2. At this time, the terminal 20 may transmit a notification indicating the reception capability of the additional channel to the base station 10 using the PRACH resource (PRACH occurrence) of Msg1 or preamble. It should be noted that the terminal 20 may predefine in which of the baseline channel and the additional channel the Msg3 transmission is scheduled.

FIG. 13 is a fourth diagram for explaining CBRA according to the 4-step random access procedure according to the second embodiment. The terminal 20 may transmit and receive the signal of the random access procedure after receiving Msg4 on the additional channel.

The terminal 20 may notify the base station 10 of which RAR to receive, the baseline channel or the additional channel, in Msg3. That is, the terminal 20 may transmit to the base station 10 a notification indicating the reception capability of the additional channel. It should be noted that whether terminal 20 receives RAR from the baseline channel or the additional channel may be defined in advance.

HARQ-ACK for Msg4 may be transmitted (scheduled) only on the baseline channel. In addition, on the A-PDCCH that schedules Msg4 (A-PDSCH), it may be scheduled on which PUCCH of the baseline channel and the additional channel the HARQ-ACK for Msg4 is transmitted.

Also, terminal 20 may attempt to receive Msg4 (PDCCH or PDSCH) on both the baseline channel and the additional channel. Also, the PDCCH that schedules Msg4 (PDSCH) may be scheduled to receive Msg4 on any PDSCH of the baseline channel and the additional channel.

Also, terminal 20 may attempt to receive Msg2 (PDCCH or PDSCH) on both the baseline channel and the additional channel. Also, the PDCCH that schedules Msg2 (PDSCH) may be scheduled to receive Msg2 on any PDSCH of the baseline channel and the additional channel.

The terminal 20 may perform a fallback operation to transmit and receive signals on the baseline channel when transmission and reception of signals on the additional channel fails. For example, in the case shown in FIG. 10 or FIG. 11, terminal 20 may transmit B-PRACH if reception of Msg2 (A-PDCCH or A-PDSCH) fails within the period of RARwindow. In that case, terminal 20 may transmit B-PRACH after power ramping and transmitting A-PRACH multiple times.

10 to 13, the terminal 20 fails to receive Msg4 (A-PDCCH or A-PDSCH) by the expiration of the period defined as "Contention resolution timer", B - MAY send PRACH. In that case, terminal 20 may transmit B-PRACH after power ramping and transmitting A-PRACH multiple times.

FIG. 14 is a first diagram for explaining CBRA by a two-step random access procedure according to the second embodiment. Terminal 20 may transmit and receive MsgA and MsgB on an additional channel. For example, the terminal 20 is notified of information related to the A-PDSCH including SIB1 and the A-PDCCH that schedules it on the A-PBCH. Furthermore, the terminal 20 is notified of information related to A-PRACH and A-PUSCH in SIB1. After that, triggered by higher layers of terminal 20, MsgA may be transmitted on A-PRACH and A-PUSCH.

FIG. 15 is a second diagram for explaining CBRA by a two-step random access procedure according to the second embodiment. The terminal 20 may perform transmission/reception after PUSCH transmission of MsgA using an additional channel. For example, the terminal 20 is notified of information on the A-PBCH on the B-PBCH, information on the B-PDSCH including the SIB1, and information on the B-PDCCH that schedules it. Information related to the A-PDSCH including SIB1 and the A-PDCCH that schedules it is notified. Further, the terminal 20 is notified of information related to B-PRACH using SIB1 of the baseline channel and information related to A-PUSCH using SIB1 of the additional channel. After that, it may be triggered from the upper layer of terminal 20 to transmit MsgA on B-PRACH and then transmit MsgA on A-PUSCH.

FIG. 16 is a third diagram for explaining CBRA by the two-step random access procedure according to the second embodiment. The terminal 20 may perform transmission and reception after receiving MsgB using an additional channel.

The terminal 20 may use MsgA to notify the base station 10 of which MsgB, the baseline channel or the additional channel, is to be received. That is, the terminal 20 may transmit to the base station 10 a notification indicating the reception capability of the additional channel.

HARQ-ACK for MsgB may be transmitted (scheduled) only on the baseline channel. Also, on the A-PDCCH that schedules MsgB (A-PDSCH), it may be scheduled on which PUCCH of the baseline channel and the additional channel to transmit the HARQ-ACK for Msg4.

Also, terminal 20 may attempt to receive MsgB (PDCCH or PDSCH) on both the baseline channel and the additional channel. Also, the PDCCH that schedules the MsgB (PDSCH) may be scheduled to receive the MsgB on any of the PDSCHs of the baseline channel and the additional channel.

The terminal 20 may perform a fallback operation to transmit and receive signals on the baseline channel when transmission and reception of signals on the additional channel fails. For example, in the cases shown in FIGS. 14 to 16, the terminal 20 may be specified in specifications for behavior when reception of MsgB (A-PDCCH or A-PDSCH) fails within the period of RARwindow. and may be set.

Specifically, if terminal 20 fails to receive MsgB (A-PDCCH or A-PDSCH) within the period of RARwindow, it may transmit A-PRACH (option 1: 4 steps of additional channel RA), 4-step RA B-PRACH may be sent (Option 2: Baseline channel fallback to 4-step RA), or 2-step RA B-PRACH may be sent Good (Option 3: Fallback to 2-step RA for baseline channel).

In addition, for the terminal 20, the behavior of combining any one of the options 1 to 3 described above may be defined in specifications or may be set. For example, terminal 20 may transmit B-PRACH after power ramping and transmitting A-PRACH multiple times.

In addition, the terminal 20 may transmit A-PUSCH when PUSCH of Msg3 is scheduled as a notification indicating fallback in MsgB (PDCCH or PDSCH) (option 1: to 4 steps RA of the additional channel 4-step RA B-PUSCH may be sent (Option 2: baseline channel fallback to 4-step RA).

In addition, the behavior of the terminal 20 that combines option 1 and option 2 described above may be defined in specifications or may be set. For example, terminal 20 may transmit B-PUSCH after power ramping and transmitting A-PUSCH multiple times.

Also, the terminal 20 may perform a random access procedure by a method (CFRA) in which A-PRACH transmission is triggered on B-PDCCH or A-PDCCH.

FIG. 17 is a first diagram for explaining CFRA according to the second embodiment. The terminal 20 may complete the random access procedure on the additional channel, as shown in FIG.

FIG. 18 is a second diagram for explaining CFRA according to the second embodiment. Terminal 20 may transmit A-PRACH (Msg1) on an additional channel after receiving B-PDCCH on the baseline channel, as shown in FIG.

FIG. 19 is a third diagram for explaining CFRA according to the second embodiment. Terminal 20 may transmit B-PRACH (Msg1) on the baseline channel after receiving A-PDCCH on the additional channel, as shown in FIG.

Also, the terminal 20 may perform a random access procedure for handover. In CFRA, the terminal 20 may receive the B-PDCCH or A-PDCCH that triggers the A-PRACH of the handover destination (post) cell on the baseline channel or the additional channel of the handover source (previous) cell. That is, in each case of CFRA shown in FIGS. may switch.

Additional channel signal configuration for random access may be configured in higher layer signaling transmitted in the baseline channel or additional channel, or system information transmitted in the baseline channel or additional channel (for example, SIB1) may be notified as

Here, if the terminal 20 does not make specific settings related to A-PDCCH or A-PDSCH as Msg2, Msg4 or MsgB, settings related to another A-PDCCH or A-PDSCH may be applied. . For example, settings related to A-PDSCH containing system information (eg, SIB1) and A-PDCCH scheduling this may be applied.

The parameters related to the signal of the additional channel related to random access may be set in common for the terminals 20 that transmit and receive on the additional channel.

The signal of the additional channel for random access may be received by the terminal 20 having a specific type or terminal capability.

In addition, the baseline channel signal and the additional channel signal for random access may be multiplexed in at least one of time, frequency, or code in the same BWP in the same cell or in another BWP, or may be multiplexed in another cell. may be sent in That is, a common BWP may be defined or set for the baseline channel and the additional channel, or individual BWPs may be defined or set.

(Relationship between Example 1 and Example 2)
The wireless communication system may implement the first and second embodiments independently, or may implement both the first and second embodiments. By implementing both the first embodiment and the second embodiment, the transmission and reception of signals related to the random access procedure can be performed in a more distributed manner, so that resources can be effectively used.

(Effect of wireless communication system according to this embodiment)
In the radio communication system according to the present embodiment, the terminal 20 transmits and receives a baseline channel signal for random access. As a result, when the baseline channel and the additional channel are used together, it is possible to appropriately transmit and receive signals related to random access, and to appropriately use resources according to their capabilities.

In addition, the terminal 20 transmits and receives additional channel signals related to random access. Thereby, for example, when the bandwidth of the baseline channel is small, it is possible to effectively use the additional channel and appropriately transmit and receive signals related to random access.

The technology according to the present embodiment described above provides a technology that enables appropriate use of resources according to capabilities.

(Device configuration)
Next, functional configuration examples of the base station 10 and the terminal 20 that execute the processes and operations described above will be described.

<Base station 10>
FIG. 20 is a diagram showing an example of the functional configuration of the base station 10. As shown in FIG. As shown in FIG. 20, the base station 10 has a transmitting section 110, a receiving section 120, a setting section 130, and a control section 140. The functional configuration shown in FIG. 20 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary. Also, the transmitting unit 110 and the receiving unit 120 may be collectively referred to as a communication unit.

The transmission unit 110 includes a function of generating a signal to be transmitted to the terminal 20 side and wirelessly transmitting the signal. The receiving unit 120 includes a function of receiving various signals transmitted from the terminal 20 and acquiring, for example, higher layer information from the received signals. Further, the transmission section 110 has a function of transmitting NR-PSS, NR-SSS, NR-PBCH, DL/UL control signals, DCI by PDCCH, data by PDSCH, and the like to the terminal 20 .

The setting unit 130 stores preset setting information and various types of setting information to be transmitted to the terminal 20 in a storage device included in the setting unit 130, and reads them from the storage device as necessary.

The control unit 140 schedules DL reception or UL transmission of the terminal 20 via the transmission unit 110 . Also, the control unit 140 includes a function of performing LBT. A functional unit related to signal transmission in control unit 140 may be included in transmitting unit 110 , and a functional unit related to signal reception in control unit 140 may be included in receiving unit 120 . Also, the transmitter 110 may be called a transmitter, and the receiver 120 may be called a receiver.

<Terminal 20>
FIG. 21 is a diagram showing an example of the functional configuration of the terminal 20. As shown in FIG. As shown in FIG. 21, the terminal 20 has a transmitting section 210, a receiving section 220, a setting section 230, and a control section 240. The functional configuration shown in FIG. 21 is merely an example. As long as the operation according to the embodiment of the present invention can be executed, the functional division and the names of the functional units may be arbitrary. The transmitting unit 210 and the receiving unit 220 may be collectively referred to as a communication unit.

The transmission unit 210 creates a transmission signal from the transmission data and wirelessly transmits the transmission signal. The receiving unit 220 wirelessly receives various signals and acquires a higher layer signal from the received physical layer signal. The receiving unit 220 also has a function of receiving NR-PSS, NR-SSS, NR-PBCH, DL/UL/SL control signals, DCI by PDCCH, data by PDSCH, and the like transmitted from the base station 10 . In addition, for example, the transmission unit 210, as D2D communication, to the other terminal 20, PSCCH (Physical Sidelink Control Channel), PSSCH (Physical Sidelink Shared Channel), PSDCH (Physical Sidelink Discovery Channel), PSBCH (Physical Sidelink Channel) etc., and the receiving unit 120 may receive PSCCH, PSSCH, PSDCH, PSBCH, or the like from another terminal 20 .

The setting unit 230 stores various types of setting information received from the base station 10 or other terminals by the receiving unit 220 in the storage device provided in the setting unit 230, and reads them from the storage device as necessary. The setting unit 230 also stores preset setting information. The control unit 240 controls the terminal 20 . Also, the control unit 240 includes a function of performing LBT.

The terminal of this embodiment may be configured as a terminal shown in each section below. Also, the following communication methods may be implemented.

<Configuration regarding this embodiment>
(Section 1)
a receiver that receives information about a second band within the first band;
a control unit that uses both the signal in the first band and the signal in the second band,
The receiving unit receives the signal of the first band for random access,
terminal.
(Section 2)
The receiving unit further receives a signal of the second band related to random access,
A terminal according to Clause 1.
(Section 3)
the first band signal for random access or the second band signal for random access includes at least one of a signal for 2-step RA and a signal for 4-step RA;
A terminal according to paragraph 2.
(Section 4)
Further comprising a transmission unit that transmits the signal of the first band related to random access,
The terminal according to any one of items 1 to 3.
(Section 5)
The transmitting unit transmits the signal in the first band for random access when the receiving unit fails to receive the signal in the second band for random access.
A terminal according to Clause 4.
(Section 6)
receiving information about a second band within the first band;
using together a signal in the first band and a signal in the second band;
receiving a signal in the first band for random access;
The method of communication performed by the terminal.

Any of the above configurations provides a technology that enables appropriate use of resources according to capabilities. According to the second term, it is possible to receive the signal of the second band for random access. According to the third item, a random access procedure of 2-step RA and 4-step RA can be realized. According to the fourth term, it is possible to transmit the signal of the first band for random access. According to item 5, a fallback operation for random access can be realized.

(Hardware configuration)
The block diagrams (FIGS. 20 and 21) used to describe the above embodiments show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Also, the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented using one device that is physically or logically coupled, or directly or indirectly using two or more devices that are physically or logically separated (e.g. , wired, wireless, etc.) and may be implemented using these multiple devices. A functional block may be implemented by combining software in the one device or the plurality of devices.

Functions include judging, determining, determining, calculating, calculating, processing, deriving, investigating, searching, checking, receiving, transmitting, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, assuming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc. can't For example, a functional block (component) that performs transmission is called a transmitting unit or transmitter. In either case, as described above, the implementation method is not particularly limited.

For example, the base station 10, the terminal 20, etc. according to the embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 22 is a diagram illustrating an example of a hardware configuration of base station 10 and terminal 20 according to an embodiment of the present disclosure. The base station 10 and terminal 20 described above are physically configured as a computer device including a processor 1001, a storage device 1002, an auxiliary storage device 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. good too.

In the following explanation, the term "apparatus" can be read as a circuit, device, unit, or the like. The hardware configuration of the base station 10 and terminal 20 may be configured to include one or more of each device shown in the figure, or may be configured without some devices.

Each function of the base station 10 and the terminal 20 is performed by the processor 1001 performing calculations and controlling communication by the communication device 1004 by loading predetermined software (programs) onto hardware such as the processor 1001 and the storage device 1002. or by controlling at least one of data reading and writing in the storage device 1002 and the auxiliary storage device 1003 .

The processor 1001, for example, operates an operating system and controls the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, and the like. For example, the control unit 140 , the control unit 240 and the like described above may be implemented by the processor 1001 .

In addition, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the auxiliary storage device 1003 and the communication device 1004 to the storage device 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. For example, control unit 140 of base station 10 shown in FIG. 20 may be implemented by a control program stored in storage device 1002 and operated by processor 1001 . Also, for example, the control unit 240 of the terminal 20 shown in FIG. 21 may be implemented by a control program stored in the storage device 1002 and operated by the processor 1001 . Although it has been explained that the above-described various processes are executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. FIG. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via an electric communication line.

The storage device 1002 is a computer-readable recording medium, for example, ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. may be configured. The storage device 1002 may also be called a register, cache, main memory (main storage device), or the like. The storage device 1002 can store executable programs (program code), software modules, etc. for implementing a communication method according to an embodiment of the present disclosure.

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

The communication device 1004 is hardware (transmitting/receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to realize at least one of, for example, frequency division duplex (FDD) and time division duplex (TDD). may consist of For example, a transmitting/receiving antenna, an amplifier section, a transmitting/receiving section, a transmission path interface, etc. may be implemented by the communication device 1004 . The transceiver may be physically or logically separate implementations for the transmitter and receiver.

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

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

In addition, the base station 10 and the terminal 20 include microprocessors, digital signal processors (DSPs), ASICs (Application Specific Integrated Circuits), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gates and other hardware arrays). , and part or all of each functional block may be implemented by the hardware. For example, processor 1001 may be implemented using at least one of these pieces of hardware.

(Supplement to the embodiment)
Although the embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art can understand various modifications, modifications, alternatives, replacements, and the like. be. Although specific numerical examples have been used to facilitate understanding of the invention, these numerical values are merely examples and any appropriate values may be used unless otherwise specified. The division of items in the above description is not essential to the present invention, and the items described in two or more items may be used in combination as necessary, and the items described in one item may be used in another item. may apply (unless inconsistent) to the matters set forth in Boundaries of functional or processing units in functional block diagrams do not necessarily correspond to boundaries of physical components. The operations of a plurality of functional units may be physically performed by one component, or the operations of one functional unit may be physically performed by a plurality of components. As for the processing procedures described in the embodiments, the processing order may be changed as long as there is no contradiction. Although the base station 10 and the terminal 20 have been described using functional block diagrams for convenience of explanation of processing, such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of the base station 10 according to the embodiment of the present invention and the software operated by the processor of the terminal 20 according to the embodiment of the present invention are stored in random access memory (RAM), flash memory, read-only memory, respectively. (ROM), EPROM, EEPROM, register, hard disk (HDD), removable disk, CD-ROM, database, server, or any other appropriate storage medium.

Also, notification of information is not limited to the aspects/embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information includes physical layer signaling (e.g., DCI, UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB ( Master Information Block (SIB), System Information Block (SIB), other signals, or a combination thereof.RRC signaling may also be referred to as RRC messages, for example, RRC Connection Setup (RRC Connection Setup) message, RRC connection reconfiguration message, or the like.

Each aspect/embodiment described in the present disclosure includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark) )), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), and other suitable systems and extended It may be applied to at least one of the next generation systems. Also, a plurality of systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A and 5G, etc.).

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described in this disclosure present elements of the various steps using a sample order, and are not limited to the specific order presented.

A specific operation performed by the base station 10 in this specification may be performed by its upper node in some cases. In a network consisting of one or more network nodes with a base station 10, various operations performed for communication with the terminal 20 may be performed by the base station 10 and other network nodes other than the base station 10 ( (eg, but not limited to MME or S-GW). Although the case where there is one network node other than the base station 10 is illustrated above, the other network node may be a combination of a plurality of other network nodes (for example, MME and S-GW). .

Information, signals, etc. described in the present disclosure may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer). It may be input and output via multiple network nodes.

Input/output information may be stored in a specific location (for example, memory) or managed using a management table. Input/output information and the like can be overwritten, updated, or appended. The output information and the like may be deleted. The entered information and the like may be transmitted to another device.

The determination in the present disclosure may be performed by a value represented by 1 bit (0 or 1), may be performed by a boolean (Boolean: true or false), or may be a numerical comparison (for example , comparison with a predetermined value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language or otherwise, includes instructions, instruction sets, code, code segments, program code, programs, subprograms, and software modules. , applications, software applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

In addition, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.), the website, Wired and/or wireless technologies are included within the definition of transmission medium when sent from a server or other remote source.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. may be represented by a combination of

The terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, the channel and/or symbols may be signaling. A signal may also be a message. A component carrier (CC) may also be called a carrier frequency, cell, frequency carrier, or the like.

The terms "system" and "network" used in this disclosure are used interchangeably.

In addition, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values from a predetermined value, or may be expressed using other corresponding information. may be represented. For example, radio resources may be indexed.

The names used for the parameters described above are not restrictive names in any respect. Further, the formulas, etc., using these parameters may differ from those expressly disclosed in this disclosure. Since the various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are in no way restrictive names. isn't it.

In the present disclosure, "base station (BS)", "radio base station", "base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB ( gNB)", "access point", "transmission point", "reception point", "transmission/reception point", "cell", "sector", " Terms such as "cell group", "carrier", "component carrier" may be used interchangeably. A base station may also be referred to by terms such as macrocell, small cell, femtocell, picocell, and the like.

A base station can accommodate one or more (eg, three) cells. When a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being associated with a base station subsystem (e.g., an indoor small base station (RRH: The term "cell" or "sector" refers to part or all of the coverage area of at least one of the base stations and base station subsystems serving communication services in this coverage. point to

In the present disclosure, terms such as "mobile station (MS)", "user terminal", "user equipment (UE)", and "terminal" may be used interchangeably.

A mobile station is defined by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless It may also be called a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term.

At least one of the base station and mobile station may be called a transmitting device, a receiving device, a communication device, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile object, the mobile object itself, or the like. The mobile object may be a vehicle (e.g., car, airplane, etc.), an unmanned mobile object (e.g., drone, self-driving car, etc.), or a robot (manned or unmanned ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

Also, the base station in the present disclosure may be read as a terminal. For example, a configuration in which communication between a base station and a terminal is replaced with communication between a plurality of terminals 20 (for example, D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.) Each aspect/embodiment of the present disclosure may be applied to. In this case, the terminal 20 may have the functions of the base station 10 described above. Also, words such as "up" and "down" may be replaced with words corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. may be read as side channels.

Similarly, a terminal in the present disclosure may be read as a base station. In this case, the base station may have the functions that the terminal has.

The terms "determining" and "determining" used in this disclosure may encompass a wide variety of actions. "Judgement" and "determination" are, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (eg, lookup in a table, database, or other data structure); Also, "judgment" and "determination" are used to refer to receiving (e.g., receiving information), transmitting (e.g., transmitting information), input, output, access (Accessing) (for example, accessing data in memory) may include deeming that a "judgment" or "decision" has been made. In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". can contain. In other words, "judgment" and "decision" may include considering that some action is "judgment" and "decision". Also, "judgment (decision)" may be read as "assuming", "expecting", "considering", or the like.

The terms "connected," "coupled," or any variation thereof, mean any direct or indirect connection or coupling between two or more elements, It can include the presence of one or more intermediate elements between two elements being "connected" or "coupled." Couplings or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be read as "access". As used in this disclosure, two elements are defined using at least one of one or more wires, cables, and printed electrical connections and, as some non-limiting and non-exhaustive examples, in the radio frequency domain. , electromagnetic energy having wavelengths in the microwave and optical (both visible and invisible) regions, and the like.

The reference signal can also be abbreviated as RS (Reference Signal), and may also be called Pilot depending on the applicable standard.

The term "based on" as used in this disclosure does not mean "based only on" unless otherwise specified. In other words, the phrase "based on" means both "based only on" and "based at least on."

Any reference to elements using the "first," "second," etc. designations used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to a first and second element does not imply that only two elements can be employed or that the first element must precede the second element in any way.

"Means" in the configuration of each device described above may be replaced with "unit", "circuit", "device", or the like.

Where "include," "including," and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. is intended. Furthermore, the term "or" as used in this disclosure is not intended to be an exclusive OR.

A radio frame may consist of one or more frames in the time domain. Each frame or frames in the time domain may be referred to as a subframe. A subframe may also consist of one or more slots in the time domain. A subframe may be of a fixed length of time (eg, 1 ms) independent of numerology.

A numerology may be a communication parameter that applies to the transmission and/or reception of a signal or channel. Numerology, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI: Transmission Time Interval), number of symbols per TTI, radio frame configuration, transceiver It may indicate at least one of certain filtering operations performed in the frequency domain, certain windowing operations performed by the transceiver in the time domain, and/or the like.

A slot may consist of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain. A slot may be a unit of time based on numerology.

A slot may contain multiple mini-slots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be referred to as a subslot. A minislot may consist of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots and symbols all represent time units when transmitting signals. Radio frames, subframes, slots, minislots and symbols may be referred to by other corresponding designations.

For example, one subframe may be called a Transmission Time Interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. may That is, at least one of the subframe and TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms may be Note that the unit representing the TTI may be called a slot, mini-slot, or the like instead of a subframe. Also, one slot may be called a unit time. The unit time may differ from cell to cell depending on the neurology.

Here, TTI refers to, for example, the minimum scheduling time unit in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each terminal 20) to each terminal 20 on a TTI basis. Note that the definition of TTI is not limited to this.

A TTI may be a transmission time unit such as a channel-encoded data packet (transport block), code block, or codeword, or may be a processing unit such as scheduling and link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) in which transport blocks, code blocks, codewords, etc. are actually mapped may be shorter than the TTI.

When one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum scheduling time unit. Also, the number of slots (the number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, or the like. A TTI that is shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, and the like.

Note that the long TTI (e.g., normal TTI, subframe, etc.) may be replaced with a TTI having a time length exceeding 1 ms, and the short TTI (e.g., shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms A TTI having the above TTI length may be read instead.

A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers included in an RB may be determined based on numerology.

Also, the time domain of an RB may include one or more symbols and may be 1 slot, 1 minislot, 1 subframe, or 1 TTI long. One TTI, one subframe, etc. may each consist of one or more resource blocks.

One or more RBs are physical resource blocks (PRB: Physical RB), sub-carrier groups (SCG: Sub-Carrier Group), resource element groups (REG: Resource Element Group), PRB pairs, RB pairs, etc. may be called.

Also, a resource block may be composed of one or more resource elements (RE: Resource Element). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of contiguous common resource blocks (RBs) for a certain numerology in a certain carrier. Here, the common RB may be identified by an RB index based on the common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or multiple BWPs may be configured for a UE within one carrier.

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

The structures such as radio frames, subframes, slots, minislots and symbols described above are only examples. For example, the number of subframes contained in a radio frame, the number of slots per subframe or radio frame, the number of minislots contained within a slot, the number of symbols and RBs contained in a slot or minislot, the number of Configurations such as the number of subcarriers, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, etc. can be varied.

In this disclosure, when articles are added by translation, such as a, an, and the in English, the disclosure may include that nouns following these articles are plural.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean that "A and B are different from C". Terms such as "separate," "coupled," etc. may also be interpreted in the same manner as "different."

Each aspect/embodiment described in the present disclosure may be used alone, may be used in combination, or may be used by switching along with execution. In addition, the notification of predetermined information (for example, notification of “being X”) is not limited to being performed explicitly, but may be performed implicitly (for example, not notifying the predetermined information). good too.

Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be practiced with modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the description of the present disclosure is for illustrative purposes and is not meant to be limiting in any way.

10 base station 110 transmitting unit 120 receiving unit 130 setting unit 140 control unit 20 terminal 210 transmitting unit 220 receiving unit 230 setting unit 240 control unit 1001 processor 1002 storage device 1003 auxiliary storage device 1004 communication device 1005 input device 1006 output device

Claims (6)

a receiver that receives information about a second band within the first band;
a control unit that uses both the signal in the first band and the signal in the second band,
The receiving unit receives the signal of the first band for random access,
terminal. The receiving unit further receives a signal of the second band related to random access,
A terminal according to claim 1 . the first band signal for random access or the second band signal for random access includes at least one of a signal for 2-step RA and a signal for 4-step RA;
A terminal according to claim 2. Further comprising a transmission unit that transmits the signal of the first band related to random access,
A terminal according to any one of claims 1 to 3. The transmitting unit transmits the signal in the first band for random access when the receiving unit fails to receive the signal in the second band for random access.
A terminal according to claim 4. receiving information about a second band within the first band;
using together a signal in the first band and a signal in the second band;
receiving a signal in the first band for random access;
The method of communication performed by the terminal.

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