CN113491144A - User terminal and wireless communication method - Google Patents

Abstract

It is possible to appropriately perform interlace-type transmission of a random access channel. A user terminal according to an aspect of the present disclosure includes: a control unit configured to control generation of a random access preamble sequence having a specific sequence length based on a specific preamble format; and a transmitting unit configured to transmit a part of the random access preamble sequence using a single interlace including a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth, in a carrier to be monitored before transmission.

Description

User terminal and wireless communication method

Technical Field

The present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.

Background

In a UMTS (Universal Mobile telecommunications System) network, Long Term Evolution (LTE) is standardized for the purpose of higher data rate, lower latency, and the like (non-patent document 1). Further, for the purpose of further increasing the bandwidth and speed of LTE, research into systems following LTE (e.g., LTE-a (LTE-Advanced), FRA (Future Radio Access), 4G, 5G + (plus), nr (new rat), and 3GPP (3 rd generation partnership project) (3GPP) is also being conducted^rdGeneration Partnership Project)) Rel.14, 15, 16-etc.).

In a conventional LTE system (e.g., rel.8-12), it is assumed that exclusive operations are performed in frequency bands (also referred to as licensed band (licensed band), licensed carrier (licensed carrier), licensed Component Carrier (CC), and the like) permitted by a communication carrier (operator). As the grant CC, for example, 800MHz, 1.7GHz, 2GHz, or the like is used.

In addition, in the conventional LTE system (e.g., rel.13), in order to expand a frequency band, use of a frequency band (also referred to as an unlicensed band (unlicensed band), an unlicensed carrier (unlicensed carrier), an unlicensed Component Carrier (CC), or the like) different from the above-described licensed band is supported. As the unauthorized band domain, for example, a 2.4GHz band or a 5GHz band that can use Wi-Fi (registered trademark) or Bluetooth (registered trademark) is conceivable.

Specifically, rel.13 supports Carrier Aggregation (CA) in which carriers (CC) in the licensed band and carriers (CC) in the unlicensed band are integrated. In this way, communication using both the authorized band domain and the unauthorized band domain is referred to as LAA (License-Assisted Access).

For the utilization of LAA, the utilization of LAA is also being studied in future wireless communication systems (e.g., 5G +, NR, rel.15 and later). In the future, Dual Connectivity (DC) between authorized and unauthorized bands or Stand-Alone (SA) between unauthorized bands may be the subject of LAA research.

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 36.300 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2 "

Disclosure of Invention

Problems to be solved by the invention

Since the unauthorized carrier is a band shared by a plurality of operators and the like, monitoring is performed to confirm the presence or absence of transmission by another device (for example, a base station, a user terminal, a Wi-Fi (registered trademark) device, or the like) before transmission of a signal. Monitoring is also referred to as Listen Before Talk (LBT), spatial Channel Assessment (CCA), carrier sense or Channel access operation (Channel access procedure), etc.

For the use of carriers that need to be monitored before transmission (unauthorized carriers), there are countries, regions, and the like in which specific rules (regulations) are defined. In order to satisfy this limitation, studies are being made on the use of "interleaved transmission" in which a signal is transmitted using a plurality of frequency resources arranged at specific frequency intervals within a specific bandwidth.

In a future wireless communication system (hereinafter, also referred to as NR or the like), a carrier (also referred to as a wideband carrier or the like) having a bandwidth wider than a specific bandwidth (for example, 20MHz) is assumed to be used as an unlicensed carrier. Therefore, in NR, monitoring is also studied for each specific band (also referred to as LBT subband domain or the like) within the carrier.

However, in the LBT subband domain, it is concerned that the interleaving transmission of the Random Access Channel (PRACH) (also referred to as a Random Access preamble, a Random Access preamble sequence, a PRACH sequence, an RACH, or the like) cannot be performed properly.

The present invention has been made in view of the above, and an object thereof is to provide a user terminal and a radio communication method capable of appropriately performing interlace-type transmission of a random access channel.

Means for solving the problems

A user terminal according to an aspect of the present disclosure includes: a control unit configured to control generation of a random access preamble sequence having a specific sequence length based on a specific preamble format; and a transmitting unit configured to transmit a part of the random access preamble sequence using a single interlace including a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth, in a carrier to be monitored before transmission.

A user terminal according to an aspect of the present disclosure includes: a control unit configured to control generation of a random access preamble sequence having a specific sequence length based on a specific preamble format; and a transmitting unit configured to transmit the entire random access preamble sequence using a plurality of interlaces each including a plurality of resource blocks arranged at a specific frequency interval within a specific bandwidth, in a carrier to be monitored before transmission.

Effects of the invention

According to the present invention, it is possible to appropriately perform interlace-type transmission of a random access channel.

Drawings

Fig. 1 is a diagram illustrating an example of a long-sequence PRACH format.

Fig. 2 is a diagram illustrating an example of a PRACH format for a short sequence.

Fig. 3 shows an example of basic PRACH design.

Fig. 4A and 4B are diagrams showing an example of the interlace transmission.

Fig. 5 is a diagram showing an example of transmission control of the random access preamble sequence according to the first aspect.

Fig. 6A to 6C are diagrams showing an example of the random access preamble sequence according to the first embodiment.

Fig. 7 is a diagram illustrating an example of transmission control of a random access preamble sequence according to the second embodiment.

Fig. 8A and 8B are diagrams illustrating an example of a random access preamble sequence according to the second embodiment.

Fig. 9 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 10 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 11 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

Fig. 12 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(NR-U)

In NR, not only licensed carriers (carriers in the licensed band), but also unlicensed carriers (carriers in the unlicensed band) are being studied for communication. A licensed carrier is a carrier that is exclusively assigned to the frequency of one operator. The unlicensed carrier is a carrier of a frequency shared by a plurality of carriers, inter-RAT, and the like.

The licensed Carrier is also called a Component Carrier (CC), a Cell, a Primary Cell (PCell), a Secondary Cell (SCell), a Primary and Secondary Cell (PSCell), etc. Further, the Unlicensed carrier is also referred to as NR-U (NR-unlicenced), CC, Unlicensed CC, cell, LAA SCell (licensed-Assisted Access SCell), or the like.

In a system in which NR or the like is used for an unlicensed carrier (for example, an LAA (Licensed Assisted Access) system), an interference control function is considered to be required for coexistence of NR or LTE of another operator, a wireless LAN (Local Area Network), or another system. The operation method of the LAA system may be referred to as dual connectivity with a licensed carrier (DC), Carrier Aggregation (CA), or Standalone (SA), and may also be referred to as LAA, NR-U, or the like.

Generally, a transmission point (e.g., a base station (gbnodeb (gnb), enodeb (enb)), User terminal (User Equipment (UE)), etc.) that performs communication using an unlicensed carrier prohibits communication via the carrier when another entity (e.g., another UE) that performs communication via the unlicensed carrier is detected.

Therefore, the transmission point performs monitoring (LBT) at a timing before the specific period of the transmission timing. Specifically, a transmission point performing LBT searches for a target band (e.g., 1 Component Carrier (CC)) at a timing (e.g., immediately preceding subframe) before a specific period of transmission timing, and confirms whether or not other devices (e.g., a base station, a UE, a Wi-Fi (registered trademark) device, etc.) communicate in the band.

In the present specification, monitoring refers to an operation of detecting and measuring whether or not a signal exceeding a specific level (e.g., a specific power) is transmitted from another transmission point or the like before a certain transmission point (e.g., a base station, a user terminal, or the like) transmits a signal. In addition, the monitoring by the transmission point is also referred to as LBT (Listen Before Talk), CCA (Clear Channel Assessment), carrier sense or Channel access operation (Channel access procedure), and the like. In addition, in the unlicensed carrier, an access scheme with contention control (also referred to as Receiver assisted access (Receiver assisted lbt), Receiver assisted lbt (Receiver assisted lbt)), or the like may be applied.

The transmission point transmits using the carrier when it can confirm that the other device is not communicating. For example, when the measured received power is monitored to be equal to or less than a specific threshold, the transmission point determines that the channel is in an idle (free) state and transmits the channel. In other words, the "channel idle state" means that there is no specific system but the channel is occupied, and means that the channel is idle (idle), the channel is idle (clear), the channel is idle (free), the monitoring is successful, and the like.

On the other hand, when detecting that another device is using a band in a part of the target carrier band, the transmission point stops its own transmission processing. For example, when detecting that the reception power of a signal from another device related to the band exceeds a specific threshold, the transmission point determines that the channel is busy (busy) and does not perform transmission. In the busy state, the channel becomes available again after re-monitoring and confirming that it is idle. In addition, the method of determining the idle state/busy state of the channel of LBT is not limited thereto.

As described above, in the NR-U, interference between LAA and Wi-Fi (registered trademark), interference between LAA systems, and the like can be avoided by introducing interference control in the same frequency by the LBT mechanism to the transmission point. In addition, when the control of the transmission point is performed independently for each operator that operates the LAA system, interference can be reduced by LBT without grasping the control content of each.

(random Access in NR-U)

In NR-U, a Random Access (RA) procedure is sometimes required for uplink transmission timing adjustment in a cell of an unlicensed carrier. For example, a case where the distance between the base station and the UE of a Cell (also referred to as an LAA SCell) forming an unlicensed carrier is different from the distance between the base station and the UE of a Primary Cell (PCell) forming a licensed carrier, or a case where the transmission timing for the SCell is assumed to be different from the transmission timing for the PCell, is considered.

Random Access can be performed in the case of initial connection or synchronization establishment, communication resumption, and the like, and can be classified into two types, Contention-Based Random Access (CBRA) and Non-Contention-Based Random Access (Non-CBRA). In addition, the non-Contention type Random Access may also be referred to as a Contention-Free RA (CFRA).

In the contention-based Random Access, the user terminal transmits a preamble randomly selected from a plurality of Random Access preambles (contention preambles) prepared in a cell through a Physical Random Access Channel (PRACH). In this case, by using the same random access preamble among the user terminals, there is a possibility that Contention (Contention) occurs.

In the non-contention type random access, the user terminal transmits a UE-specific random access preamble (dedicated preamble) allocated in advance from the network through the PRACH. In this case, since different random access preambles are allocated between user terminals, contention does not occur.

The contention-based random access may be performed, for example, when initial connection is performed, when uplink communication is started or restarted, or the like. The non-contention type random access may be performed, for example, in the case of handover, start or restart of downlink communication, or the like. In the LAA SCell, non-contention type random access is assumed, but contention type random access may be performed.

In the future wireless communication systems described above, a plurality of PRACH formats (also referred to as PRACH preamble formats, and the like) are being studied.

The RA (Random Access) preamble using each PRACH format includes RACH OFDM symbols. Further, the RA preamble may also include at least one of a Cyclic Prefix (CP) and a Guard Period (GP). For example, PRACH formats 0 to 3 shown in fig. 1 use a long sequence (long sequence) preamble sequence in the RACH OFDM symbol. The PRACH formats a1 to A3, B1 to B4, C0, and C2 shown in fig. 2 use a short sequence (short sequence) preamble sequence in an RACH OFDM symbol.

The Frequency of the unlicensed carrier may be in a Frequency Range of any of FR (Frequency Range) 1 and FR 2. FR1 may be a frequency range lower than a specific frequency, and FR2 may be a frequency range higher than a specific frequency. In NR-U, the specific frequency may also be 7 GHz. For example, FR1 may be a 5GHz band or a 6GHz band. FR2 may be, for example, a 60GHz band.

As shown in fig. 3, the preamble sequence may also be a Zadoff-chu (zc) sequence. The preamble sequence length may be 839 (long sequence) or 139 (short sequence). The preamble sequence may also be mapped to frequency resources (e.g., subcarriers) allocated to the PRACH.

The RA preamble may also use one of a plurality of parameter sets (numerology). The SubCarrier Spacing (SCS) of the long sequence of FR1 for NR can also be either 1.25kHz or 5 kHz. The SCS of the short sequence of FR1 for NR can also be either 15kHz, 30 kHz. The short sequence SCS of FR2 for NR can also be either 60kHz, 120 kHz. The SCS for long sequences of LTE may also be 1.25 kHz. The SCS for short sequences of LTE may also be 7.5 kHz.

Furthermore, in order to utilize unlicensed carriers, certain restrictions need to be satisfied. For example, according to the rules (regulations) of the European Telecommunications Standardization Institute (ETSI), regarding the utilization of 5GHz, which is one of unlicensed carriers, an Occupied Channel Bandwidth (OCB) containing 99% of the power of a signal must be a Bandwidth of 80% or more of the available Bandwidth (e.g., system Bandwidth). Furthermore, a limit is stipulated with respect to the maximum transmit Power Density (PSD: Power Spectral Density) for each specific bandwidth (1 MHz).

However, since the frequency bandwidth occupied by the parameter set of the PRACH is narrow, the PRACH may not satisfy the OCB rule. In addition to the PRACH, there is a possibility that other Uplink signals (for example, an Uplink Control Channel (PUCCH) and an Uplink Shared Channel (PUSCH)) do not satisfy the OCB rule.

Therefore, it is being studied to extend the band of an uplink signal for an unlicensed carrier by supporting an interlace type transmission.

Here, the interlace-type transmission may be referred to as multi-cluster transmission in units of a specific Frequency resource (e.g., one or more Resource Blocks (RBs) or one or more subcarriers), Block IFDMA (Block Interleaved Frequency Division Multiple Access), or the like. One interlace is defined as a set of a plurality of frequency resources allocated by a specific frequency interval (e.g., 10RB interval or 5RB interval). Further, one interlace may also be defined as a set of resources that is mapped to each specific range (e.g., 10RB) in the frequency direction using the same resource (RB or cluster) parameter.

The frequency resources dispersed in the frequency direction included in the 1 interlace may also be referred to as clusters, respectively. The 1 cluster may be composed of more than one contiguous RB, subcarrier, resource block group, etc. Further, it is envisaged that the frequency modulation within the cluster is not applicable, but may be applicable as well.

Fig. 4A and 4B are diagrams showing an example of the interlace-type transmission. For example, fig. 4A and 4B show an example of the interleaved PUSCH transmission. As shown in fig. 4A and 4B, the interlace type transmission may also be designed so as not to exceed a bandwidth of an LBT subband domain (e.g., 20 MHz).

Here, the LBT subband domain may be a bandwidth that is a unit for performing LBT and is at least a part of NR-U carriers (also referred to as a wideband carrier, a wideband, an LAAS cell, an LAA cell, an NR-U carrier, an NR-U cell, a cell, or the like). For example, one or more LBT subband domains may also be located within the NR-U carrier. A guard band domain (also referred to as a guard domain, etc.) may also be provided at least one end of each LBT sub-band domain.

Fig. 4A and 4B show an interleave transmission in the case where a Subcarrier Spacing (SCS) is 15kHz and 30kHz, respectively. In any SCS, 1 Physical Resource Block (PRB) (also called Resource Block (RB)) may be composed of 12 subcarriers. Therefore, when the SCS is 30kHz, the number of PRBs included in the same LBT subband domain is 1/2 times as large as when the SCS is 15 kHz.

As shown in fig. 4A, when SCS is 15kHz, 10 interlaces #0 to #9 may be provided in the LBT subband domain. Each interlace may also be composed of 10 or 11 PRBs. For example, in fig. 4A, the interlace # i (i is 0 to 9) is composed of 11RB or 10RB as an index value i +10 · n (n is 0 to 10 or 0 to 9). In fig. 4A, the frequency interval between RBs constituting the same interlace # i is 9 RB. That is, the RBs constituting the same interlace # i are set every 10 RBs.

On the other hand, as shown in fig. 4B, when the SCS is 30kHz, 5 interlaces #0 to #4 may be provided in the LBT subband domain. Each interlace may also be composed of 10 or 11 PRBs. For example, in fig. 4B, the interlace # i (i is 0 to 4) is composed of 11RB or 10RB as an index value i +5 · n (n is 0 to 10 or 0 to 9). In fig. 4A, the frequency interval between RBs constituting the same interlace # i is 4 RB. That is, RBs constituting the same interlace # i are set every 5 RBs.

In fig. 4A and 4B, one or more interlaces may be allocated to the PUSCH.

As described above, in NR-U, it is assumed that an interlace consisting of 10PRB or 11PRB dispersed in the LBT subband domain is allocated to an uplink signal (e.g., PUSCH). When such an uplink signal (e.g., PUSCH) is multiplexed with the PRACH, there is a concern that the PRACH cannot be appropriately transmitted.

For example, in NR-U, it is assumed that a preamble with a sequence length of 139 (short sequence) is used for PRACH. However, as shown in fig. 4A, in the case where the SCS is 15kHz, in order to transmit a preamble sequence of a sequence length 139 through an RB of every 10 RBs, a minimum of 12 PRBs (144 subcarriers) is required for each 1 interlace, and a maximum bandwidth of 21.6MHz is required. In this case, the preamble sequence of sequence length 139 is feared not to be within the LBT subband domain (e.g., 20 MHz).

Similarly, as shown in fig. 4A, in order to transmit a preamble sequence of a sequence length 139 through RBs of 5 RBs when the SCS is 30kHz, a minimum of 12PRB (144 subcarriers) is required for each 1 interlace, and a maximum bandwidth of 21.6MHz is required. In this case, the preamble sequence of sequence length 139 is feared not to be within the LBT subband domain (e.g., 20 MHz).

In NR-U, considering diversity when coexisting with Wi-Fi (registered trademark) having a channel width of 20MHz, it is assumed that a transmission band is divided for each LBT sub-band domain (for example, 20 MHz). Therefore, it is not preferable that the bandwidth for transmission of the PRACH exceeds the LBT subband domain.

To transmit PRACH of a preamble sequence of sequence length 139 in an LBT subband domain (e.g., 20MHz), it is considered that an interval of RBs constituting interleaving becomes narrower than that of a PUSCH (e.g., fig. 4A and 4B). For example, if an interlace is formed with RBs every 5 RBs when the SCS is 15kHz, the LBT subband domain includes 20 RBs, and thus the PRACH can be transmitted within the LBT subband.

However, in this case, since the interleaving arrangement is different from that of other uplink signals (e.g., PUSCH), frequency division multiplexing of PRACH with the other uplink signals cannot be performed, and there is a concern that frequency utilization efficiency may be low.

Therefore, the present invention contemplates that a PRACH can be transmitted using the same interleaving arrangement as that of another uplink signal (e.g., PUSCH) in the LBT subband domain by transmitting a part of a preamble sequence for the PRACH (first scheme) or by using a plurality of interleaves (second scheme).

Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. The respective modes of the present embodiment may be applied individually or in combination.

In the present embodiment, the "transmission point (transmission apparatus)" is, for example, at least one of a base station and a UE. When the transmission point is a base station, the "channel" may be at least one of a DL channel (e.g., PDSCH) and a DL signal. In addition, when the transmission point is a UE, the "channel" may be at least one of an UL channel (e.g., PUSCH) and an UL signal.

In the present embodiment, "random access preamble sequence", "PRACH", "random access preamble", "PRACH sequence", "preamble sequence", "preamble", and "RACH sequence" may be replaced with each other.

In the following, although the interleaved transmission in the case where the SCS is 15kHz (for example, fig. 4A) is exemplified, it is needless to say that the present embodiment can be applied to the interleaved transmission in another SCS (for example, 30kHz or the like as illustrated in fig. 4B).

(first mode)

In the first scheme, the UE may transmit a part of a random access preamble sequence of a specific sequence length (e.g., sequence length 139) using a single interlace composed of a plurality of resource blocks arranged at specific frequency intervals within a specific bandwidth (e.g., LBT subband domain).

In the first aspect, the UE may suspend transmission of the remaining part of the random access preamble sequence.

The remaining part may correspond to a specific number of subcarriers (for example, 7 subcarriers) selected at random among all subcarriers corresponding to the random access preamble sequence (for example, 139 subcarriers in the case of the sequence length 139).

Alternatively, the remaining portion may correspond to a specific number of subcarriers (for example, 7 subcarriers) at a specific frequency interval among all subcarriers corresponding to the random access preamble sequence (for example, 139 subcarriers in the case of the sequence length 139).

Alternatively, the remaining part may correspond to a specific number of subcarriers (for example, 7 subcarriers) from the maximum number (old number) (or the minimum number (new number)) among all subcarriers corresponding to the random access preamble sequence (for example, 139 subcarriers in the case of the sequence length 139).

Fig. 5 is a diagram showing an example of transmission control of the random access preamble sequence according to the first aspect. In fig. 5, although SCS is 15kHz, the present invention can be applied to other SCS. For example, in fig. 5, interlace #0 including 11RB is allocated to transmission of the random access preamble sequence. In fig. 5, the sequence length of the random access preamble sequence is 139, but the present invention is not limited thereto.

As shown in fig. 5, interlace #0 including 11RB is composed of 132 subcarriers (═ 11 · 12). When generating a random access preamble sequence having a sequence length 139 based on a specific preamble format, the UE may map a part of the random access preamble (for example, a part corresponding to 132 subcarriers) to 132 subcarriers #0 to #131 constituting interlace #0 using interlace #0 and transmit the mapped part.

On the other hand, the UE may suspend transmission of the remaining part (for example, part corresponding to 7 subcarriers) of the random access preamble sequence of the sequence length 139. Fig. 6A to 6C are diagrams showing an example of the random access preamble sequence according to the first embodiment. In fig. 6A to 6C, the random access preamble sequence having the sequence length 139 is associated with 139 subcarriers in ascending order.

For example, as shown in fig. 6A, the UE may randomly select a specific number of subcarriers (here, 7 subcarriers) for which transmission is suspended, among all subcarriers (here, 139 subcarriers) corresponding to the random access preamble sequence. In this case, in addition to the portion corresponding to the selected subcarrier, portions corresponding to other 132 subcarriers may be mapped to subcarriers #0 to #131 constituting interlace #0 (for example, fig. 5).

As shown in fig. 6A, by suspending transmission of a specific number of randomly selected subcarriers (here, 7 carriers), it is possible to randomize (average) the influence on the detection performance of the random access preamble.

Alternatively, as shown in fig. 6B, the UE may select a specific number of subcarriers (here, 7 subcarriers) for which transmission is suspended at a specific frequency interval among all subcarriers (here, 139 subcarriers) corresponding to the random access preamble sequence.

For example, when the random access preamble sequence having the sequence length 139 is associated with subcarriers #1 to #139 (or #0 to #138) in an ascending order, the UE may map the parts corresponding to the other 132 subcarriers to subcarriers #0 to #131 constituting interlace #0, in addition to the parts corresponding to 7 subcarriers #20, #39, #59, #79, #99, #119, #139 (or 7 subcarriers #19, #18, #58, #78, #98, #118, #138) (for example, fig. 5).

The entire frequency intervals between the specific number of subcarriers for which transmission is suspended may be unequal, and may be approximately equal. That is, the entire frequency intervals between subcarriers may not be equal, and the frequency intervals between some subcarriers may be narrower or wider than the frequency intervals between other subcarriers.

As shown in fig. 6B, by stopping transmission of a specific number of subcarriers (here, 7 subcarriers) selected at substantially equal intervals, selection of subcarriers for which transmission is stopped can be easily performed, and the influence on detection performance can be averaged to some extent.

Alternatively, as shown in fig. 6C, the UE may suspend transmission of a portion corresponding to a specific number of subcarriers (for example, 7 subcarriers) from the maximum number (old number) (or minimum number (new number)) among all subcarriers (139 subcarriers here) corresponding to the random access preamble sequence.

For example, when a random access preamble sequence having a sequence length 139 is associated with 139 subcarriers #0 to #138 in ascending order, the UE may map parts corresponding to the other 132 subcarriers to subcarriers #0 to #131 constituting interlace #0 (for example, fig. 5) in addition to parts corresponding to 7 subcarriers #132 to # 138.

As shown in fig. 6C, by suspending transmission from the maximum number (or the minimum number) to a specific number of subcarriers (here, 7 subcarriers), selection of subcarriers in which transmission is suspended can be easily performed.

As described above, in the first aspect, by transmitting a part of the random access preamble sequence using a single interlace, it is possible to transmit PRACH using the same interlace configuration as that of another uplink signal such as PUSCH in the LBT subband domain.

(second mode)

In the second aspect, the UE may transmit (the entire) random access preamble sequence of a specific sequence length (e.g., sequence length 139) using a plurality of interlaces each composed of a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth (e.g., LBT subband domain). The second embodiment will be described mainly focusing on differences from the first embodiment.

In the second aspect, the UE may control mapping of the random access preamble sequence to the subcarriers constituting the plurality of interlaces based on at least one of a specific rule and the random access preamble sequence.

Fig. 7 is a diagram illustrating an example of transmission control of a random access preamble sequence according to the second embodiment. Fig. 7 is mainly explained about the difference from fig. 5. For example, in fig. 7, it is assumed that interlaces #0 and #1 are allocated to transmission of the random access preamble sequence. In fig. 7, interlace #0 includes 11RB and interlace #1 includes 10RB, but the number of RBs constituting each interlace allocated to transmission of the random access preamble sequence is not limited to this.

As shown in fig. 7, when interlace #0 and interlace #1 are allocated, the UE can use subcarriers (here, 252 subcarriers (12 · 11+12 · 10)) constituting interlace #0 and interlace #1 for transmission of a random access preamble sequence having a specific sequence length (here, sequence length 139).

The UE may control mapping of the random access preamble sequence of the sequence length 139 of the subcarriers constituting interlaces #0 and #1 according to a specific rule.

The specific rule may also be: the random access preamble sequence is mapped in ascending order starting from the subcarriers within a particular interlace assigned to the random access preamble sequence, and the remaining sequences are mapped to the subcarriers within the next interlace. The specific interlace may also be an interlace assigned to the smallest or largest index of the random access preamble sequence.

Fig. 8A and 8B are diagrams illustrating an example of a random access preamble sequence according to the second embodiment. In fig. 8A and 8B, as described in fig. 7, interlaces #0 and #1 are allocated to transmission of the random access preamble sequence from the UE.

For example, as shown in fig. 8A, the random access preamble sequence having the sequence length 139 may be mapped to subcarriers #0 to #131 of interlace #0 and subcarriers #0 to #6 of interlace #1 in order (ascending order) from the front. In fig. 8A, mapping starts from a specific interlace (e.g., an interlace of the smallest or largest index) among a plurality of interlaces allocated, regardless of which random access preamble sequence.

As shown in fig. 8A, when mapping of a plurality of interlaces is controlled according to a specific rule regardless of (the index of) the random access preamble sequence, it is possible to easily determine the resource (subcarrier) to map the random access preamble sequence.

Alternatively, as shown in fig. 8B, mapping may be performed from different interlaces for each random access preamble sequence. For example, in fig. 8B, random access preamble sequence #0 is mapped to subcarriers #0 to #131 of interlace #0 and subcarriers #0 to #6 of interlace #1 in order (ascending order) from the front. On the other hand, random access preamble sequence #1 is mapped to carriers #0 to #131 of interlace #1 and subcarriers #0 to #6 of interlace #0 in order (ascending order) from the front.

In this way, the UE may determine the interlace to be mapped first among the plurality of assigned interlaces based on the index of the random access preamble sequence.

As shown in fig. 8B, when mapping of a plurality of interlaces is controlled based on (the index of) the random access preamble sequence, it is possible to suppress the influence of characteristics when PRACH competes with each other.

The rule for mapping the random access preamble sequence having a sequence length exceeding the number of subcarriers in a single interlace into a plurality of interlaces is not limited to the case shown in fig. 8A, 8B, and the like. For example, the random access preamble sequences may be equally mapped to the plurality of interlaces, respectively.

As described above, in the second aspect, by transmitting the entire random access preamble sequence using a plurality of interlaces, the detection characteristics of the PRACH can be improved compared to the first aspect. Also, the PRACH can be transmitted using the same interleaving arrangement as that of another uplink signal such as a PUSCH in the LBT subband domain.

(Wireless communication System)

Hereinafter, a configuration of a radio communication system according to an embodiment of the present disclosure will be described. In this radio communication system, communication is performed using any one of the radio communication methods according to the above embodiments of the present disclosure, or a combination thereof.

Fig. 9 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), New wireless (5th Generation mobile communication system New Radio (5G NR)) of the fifth Generation mobile communication system, or the like.

In addition, the wireless communication system 1 may also support Dual Connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). The MR-DC may include Dual connection of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC))), Dual connection of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC))), and the like.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station of NR (gNB) is MN and the base station of LTE (E-UTRA) (eNB) is SN.

The wireless communication system 1 may also support Dual connection between a plurality of base stations within the same RAT (for example, Dual connection of a base station (gNB) in which both MN and SN are NR (NR-NR Dual Connectivity (NN-DC)))).

The wireless communication system 1 may include: a base station 11 forming a macro cell C1 having a relatively wide coverage area, and base stations 12(12a to 12C) arranged in the macro cell C1 and forming a small cell C2 narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the embodiments shown in the figures. Hereinafter, base stations 11 and 12 will be collectively referred to as base station 10 without distinction.

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

Each CC may be included in at least one of the first Frequency band (Frequency Range 1(FR1))) and the second Frequency band (Frequency Range 2(FR 2))). Macro cell C1 may also be contained in FR1 and small cell C2 may also be contained in FR 2. For example, FR1 may be a frequency band of 6GHz or less (lower than 6GHz (sub-6GHz)), and FR2 may be a frequency band higher than 24GHz (above-24 GHz). The frequency bands, definitions, and the like of FR1 and FR2 are not limited to these, and FR1 may correspond to a higher frequency band than FR2, for example.

The user terminal 20 may perform communication in each CC by using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber based Common Public Radio Interface (CPRI)), X2 Interface, or the like) or wirelessly (e.g., NR communication). For example, when NR communication is used as a Backhaul between base stations 11 and 12, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) host (donor) and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The Core Network 30 may include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN)), a Next Generation Core (NGC), and the like.

The user terminal 20 may be a terminal supporting at least one of communication schemes such as LTE, LTE-a, and 5G.

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). For example, in at least one of the downlink (dl)) and the uplink (ul)), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used.

The radio access method may also be referred to as a waveform (waveform). In the radio communication system 1, other radio access schemes (for example, other single-carrier transmission schemes and other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

In the radio communication system 1, as the Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH))), a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))) and the like that are Shared by the user terminals 20 may be used.

In the radio communication system 1, as the Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))), a Random Access Channel (Physical Random Access Channel (PRACH)), and the like, which are Shared by the user terminals 20, may be used.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted over the PUSCH. In addition, a Master Information Block (MIB)) may also be transmitted through the PBCH.

The lower layer control information may also be transmitted through the PDCCH. The lower layer Control Information may include, for example, Downlink Control Information (DCI)) including scheduling Information of at least one of the PDSCH and the PUSCH.

The DCI scheduling PDSCH may be referred to as DL assignment, DL DCI, or the like, and the DCI scheduling PUSCH may be referred to as UL grant, UL DCI, or the like. The PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be used. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). 1 CORESET may also be associated with 1 or more search spaces. The UE may also monitor the CORESET associated with a certain search space based on the search space settings.

The 1 search space may also correspond to PDCCH candidates that conform to 1 or more aggregation levels (aggregation levels). The 1 or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be replaced with each other.

Uplink Control Information (UCI) including at least one of Channel State Information (CSI), acknowledgement Information (for example, Hybrid Automatic Repeat reQuest (HARQ-ACK)), ACK/NACK, and Scheduling ReQuest (SR)) may be transmitted through the PUCCH. A random access preamble for establishing a connection with a cell may also be transmitted through the PRACH.

In addition, in the present disclosure, a downlink, an uplink, and the like may also be expressed without "link". Further, it can be said that "Physical (Physical)" is not attached to the head of each channel.

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, the DL-RS may be a Cell-specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a DeModulation Reference Signal (DMRS), a Positioning Reference Signal (PRS), a Phase Tracking Reference Signal (PTRS), or the like.

The Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. The signal blocks containing SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH blocks, SS blocks (SSB), and the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In addition, in the wireless communication system 1, as an Uplink Reference Signal (UL-RS), a measurement Reference Signal (Sounding Reference Signal (SRS)), a demodulation Reference Signal (DMRS), or the like may be transmitted. The DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal).

(base station)

Fig. 10 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmitting/receiving unit 120, a transmitting/receiving antenna 130, and a transmission line interface (transmission line interface) 140. The control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission line interface 140 may be provided with one or more than one.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, and the base station 10 can be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation of signals, scheduling (e.g., resource allocation, mapping), and the like. The control unit 110 may control transmission and reception, measurement, and the like using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmission/reception section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

The transceiver 120 may also include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission/reception section 120 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission/reception unit 120 may receive the uplink channel, the uplink reference signal, and the like.

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, with respect to Data, Control information, and the like acquired from Control section 110, transmission/reception section 120 (transmission processing section 1211) may perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like, and generate a bit string to be transmitted.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

The transmission/reception unit 120(RF unit 122) may perform modulation, filter processing, amplification, and the like for a baseband signal in a radio frequency band, and transmit a signal in the radio frequency band via the transmission/reception antenna 130.

On the other hand, the transmission/reception unit 120(RF unit 122) may perform amplification, filter processing, demodulation to a baseband signal, and the like on a signal of a radio frequency band received by the transmission/reception antenna 130.

Transmission/reception section 120 (reception processing section 1212) may acquire user data and the like by applying, to the acquired baseband signal, reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing.

The transmission/reception unit 120 (measurement unit 123) may also perform measurement related to the received signal. For example, measurement section 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, and the like based on the received signal. Measurement section 123 may perform measurement of Received Power (e.g., Reference Signal Received Power (RSRP)), Received Quality (e.g., Reference Signal Received Quality (RSRQ)), Signal to Interference plus Noise Ratio (SINR)), Signal to Noise Ratio (SNR)), Signal Strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), and the like. The measurement results may also be output to the control unit 110.

The transmission path interface 140 may transmit and receive signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, or may acquire and transmit user data (user plane data) and control plane data and the like for the user terminal 20.

The transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140.

Further, transmission/reception section 120 may transmit a channel (also referred to as a DL channel, a DL signal, data, or the like, for example, PDSCH).

The control unit 110 may also control reception of a channel (for example, PRACH, PUSCH, or the like) provided in at least one of a plurality of contiguous band regions within the channel based on a monitoring result for each band region (LBT subband region) provided within the channel.

The transmission/reception unit 120 may receive a part of the random access preamble sequence using a single interlace including a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth in a channel to be monitored before transmission (first aspect). The control unit 110 may also control reception of a portion of the random access preamble sequence.

The transmission/reception unit 120 may receive the entire random access preamble sequence using a plurality of interlaces each composed of a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth in a channel to be monitored before transmission (second aspect). The control unit 210 may control reception of the entire random access preamble sequence.

The control unit 110 may control demapping of the random access preamble sequence of the subcarriers constituting the plurality of interlaces according to a specific rule or based on the random access preamble sequence (second mode).

(user terminal)

Fig. 11 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission/reception unit 220, and a transmission/reception antenna 230. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided in one or more numbers.

In this example, the functional blocks of the characteristic parts in the present embodiment are mainly shown, but the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 210 may also control the generation, mapping, etc. of the signals. Control section 210 may control transmission/reception, measurement, and the like using transmission/reception section 220 and transmission/reception antenna 230. Control section 210 may generate data, control information, a sequence, and the like to be transmitted as a signal, and forward the generated data, control information, sequence, and the like to transmission/reception section 220.

The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmitting/receiving section 220 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting/receiving circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission section may be constituted by the transmission processing section 2211 and the RF section 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmitting/receiving antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 220 may receive the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmission/reception unit 220 may transmit the uplink channel, the uplink reference signal, and the like described above.

Transmit/receive section 220 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, transmission/reception section 220 (transmission processing section 2211) may perform processing in the PDCP layer, processing in the RLC layer (for example, RLC retransmission control), processing in the MAC layer (for example, HARQ retransmission control), and the like on data, control information, and the like acquired from control section 210, and generate a bit sequence to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (including error correction coding as well), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

Whether or not DFT processing is applied may be set based on transform precoding. When transform precoding is active (enabled) for a certain channel (e.g., PUSCH), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, or otherwise, transmission/reception section 220 (transmission processing section 2211) may not perform DFT processing as the transmission processing.

The transmission/reception section 220(RF section 222) may perform modulation, filtering, amplification, and the like for a baseband signal in a radio frequency band, and transmit a signal in the radio frequency band via the transmission/reception antenna 230.

On the other hand, the transmission/reception section 220(RF section 222) may perform amplification, filter processing, demodulation to a baseband signal, and the like on a signal in a radio frequency band received by the transmission/reception antenna 230.

Transmission/reception section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 210.

The transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220, the transmitting/receiving antenna 230, and the transmission path interface 240.

Further, transmission/reception section 220 may transmit a channel (also referred to as an UL channel, UL signal, data, or the like, for example, PUSCH, PRACH, or the like).

The control unit 210 may also control transmission of a channel (for example, PRACH, PUSCH, or the like) in at least one of a plurality of contiguous band regions provided in a carrier based on a result of monitoring for each band region (LBT subband region) provided in the carrier.

The control unit 210 may also control generation of a random access preamble sequence of a specific sequence length based on a specific preamble format.

The transmission/reception unit 220 transmits a part of the random access preamble sequence using a single interlace including a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth, on a carrier on which monitoring is performed before transmission (first aspect). The control unit 210 may also control transmission of a portion of the random access preamble sequence.

The control unit 210 may suspend transmission of the remaining part of the random access preamble sequence (or may not transmit the remaining part) (the first scheme). The remaining part may correspond to a specific number of randomly selected subcarriers, a specific number of subcarriers of a predetermined frequency interval, or a specific number of subcarriers from the maximum number among all subcarriers corresponding to the random access preamble sequence.

The transmission/reception unit 220 transmits the entire random access preamble sequence using a plurality of interlaces each composed of a plurality of resource blocks arranged at specific frequency intervals within a specific bandwidth, on a carrier to be monitored before transmission (second aspect). The control unit 210 may control transmission of the entire random access preamble sequence.

The control unit 210 may control mapping of the random access preamble sequence for the subcarriers constituting the plurality of interlaces according to a specific rule or based on the random access preamble sequence (second mode).

(hardware construction)

The block diagram used in the description of the above embodiment shows blocks in functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one apparatus that is physically or logically combined, or may be implemented by a plurality of apparatuses that are directly or indirectly (for example, by wire or wireless) connected to two or more apparatuses that are physically or logically separated. The functional blocks may also be implemented by combining the above-described apparatus or apparatuses with software.

Here, the functions include judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), assignment (assigning), and the like, but are not limited to these. For example, a function block (a configuration unit) that realizes a transmission function may also be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. Any of these methods is not particularly limited, as described above.

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the present disclosure, terms such as device, circuit, apparatus, section (section), unit, and the like can be substituted for each other. The hardware configurations of the base station 10 and the user terminal 20 may include one or more of the respective devices shown in the drawings, or may not include some of the devices.

For example, only one processor 1001 is illustrated, but there may be multiple processors. The processing may be executed by one processor, or may be executed by two or more processors simultaneously, sequentially, or by another method. The processor 1001 may be mounted on one or more chips.

Each function of the base station 10 and the user terminal 20 is realized by, for example, reading specific software (program) into hardware such as the processor 1001 and the memory 1002, performing an operation by the processor 1001 to control communication via the communication device 1004, or controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110(210), the transmitting and receiving unit 120(220), and the like may be implemented by the processor 1001.

Further, the processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to them. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments can be used. For example, the control unit 110(210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be similarly realized for other functional blocks.

The Memory 1002 may be a computer-readable recording medium, and may be formed of at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), or another suitable storage medium. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), or the like. The memory 1002 can store a program (program code), a software module, and the like that are executable to implement the wireless communication method according to one embodiment of the present disclosure.

The storage 1003 may be a computer-readable recording medium, and may be configured by at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, a magneto-optical disk (e.g., a Compact Disc read only memory (CD-ROM)), a digital versatile Disc (dvd), a Blu-ray (registered trademark) disk (Blu-ray Disc), a removable disk (removable Disc), a hard disk drive, a smart card (smart card), a flash memory device (e.g., a card (card), a stick (stick), a key drive)), a magnetic stripe (stripe), a database, a server, and other suitable storage media, for example.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplexing (FDD) and Time Division Duplexing (TDD), for example. For example, the transmitting/receiving unit 120(220), the transmitting/receiving antenna 130(230), and the like described above may be implemented by the communication device 1004. The transmitting/receiving unit 120(220) may be physically or logically separately installed from the transmitting unit 120a (220a) and the receiving unit 120b (220 b).

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

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be formed by a single bus, or may be formed by different buses between the respective devices.

The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), or the like, and a part or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may also be installed with at least one of these hardware.

(modification example)

In addition, terms described in the present disclosure and terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS for short, and may also be referred to as Pilot (Pilot), Pilot Signal, etc. depending on the applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

A radio frame may also be made up of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, a subframe may also be composed of one or more slots in the time domain. The sub-frame may also be a fixed length of time (e.g. 1ms) independent of the parameter set.

Here, the parameter set may also refer to a communication parameter applied in at least one of transmission and reception of a certain signal or channel. For example, the parameter set may indicate at least one of SubCarrier Spacing (SCS), bandwidth, symbol length, cyclic prefix length, Transmission Time Interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the Time domain, and the like.

The time slot may be formed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, or the like) in the time domain. Further, the time slot may also be a time unit based on a parameter set.

A timeslot may also contain multiple mini-slots. Each mini slot (mini slot) may also be formed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be made up of a fewer number of symbols than a slot. PDSCH (or PUSCH) transmitted in a time unit larger than a mini slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may also use other names corresponding to each. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be replaced with one another.

For example, one subframe may also be referred to as TTI, a plurality of consecutive subframes may also be referred to as TTI, and one slot or one mini-slot may also be referred to as TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1 to 13 symbols), or may be a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (such as a frequency bandwidth and transmission power usable by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (e.g., the number of symbols) to which a transport block, a code block, a codeword, or the like is actually mapped may be shorter than the TTI.

When one slot or one mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. The number of slots (the number of mini-slots) constituting the minimum time unit of the schedule may be controlled.

The TTI having a time length of 1ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided based on the parameter set.

In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, and the like may be formed of one or more resource blocks.

In addition, one or more RBs may also be referred to as a Physical Resource Block (PRB), a subcarrier Group (SCG), a Resource Element Group (REG), a PRB pair, an RB pair, and the like.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, one RE may also be a radio resource region of one subcarrier and one symbol.

The Bandwidth Part (BWP) (which may be referred to as a partial Bandwidth) may also indicate a subset of consecutive common RBs (common resource blocks) for a certain parameter set in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. PRBs may also be defined in a certain BWP and are numbered additionally within the BWP.

The BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). One or more BWPs may also be set within 1 carrier for the UE.

At least one of the set BWPs may be active, and the UE may not expect to transmit and receive a specific signal/channel other than the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be interpreted as "BWP".

The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the structure of the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and the like can be variously changed.

The information, parameters, and the like described in the present disclosure may be expressed as absolute values, relative values to specific values, or other corresponding information. For example, the radio resource may also be indicated by a specific index.

In the present disclosure, the names used for the parameters and the like are not limitative names in all aspects. Further, the mathematical expressions and the like using these parameters may also be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus, the various names assigned to these various channels and information elements are not limitative names in all aspects.

Information, signals, and the like 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, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Information, signals, and the like can be output to at least one of a higher layer (upper layer) to a lower layer (lower layer) and a lower layer to a higher layer. Information, signals, and the like may be input and output via a plurality of network nodes.

The input/output information, signals, and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. The input/output information, signals, and the like may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

The information notification is not limited to the embodiment and embodiment described in the present disclosure, and may be performed by other methods. For example, the Information notification in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast Information (Master Information Block (MIB)), System Information Block (SIB)), or the like), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

The physical Layer signaling may also be referred to as Layer 1/Layer 2(L1/L2)) control information (L1/L2 control signal), L1 control information (L1 control signal), and the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup (RRC Connection Setup) message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message, or the like. The MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to an explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of other information).

The decision may be made by a value (0 or 1) represented by one bit, by a true-false value (boolean) represented by true (true) or false (false), or by a comparison of values (e.g., with a specific value).

Software shall be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects (objects), executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names.

Software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, where the software is transmitted from a website, server, or other remote source (remote source) using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of transmission medium.

The terms "system" and "network" as used in this disclosure can be used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-location (qcl))", "Transmission setting Indication state (TCI state))", "spatial relationship (spatial relationship)", "spatial filter (spatial domain filter)", "Transmission power", "phase rotation", "antenna port group", "layer", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "Base Station", "fixed Station", "NodeB", "enb (enodeb)", "gnb (gnnodeb)", "access point (access point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission Reception Point (TRP)", "panel", "cell", "sector", "cell group", "carrier", "component carrier" can be used interchangeably. There are also cases where a base station is referred to by terms such as macrocell, smallcell, femtocell, picocell, and the like.

The base station can accommodate one or more (e.g., three) cells. When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also provide communication services through a base station subsystem (e.g., a small-sized indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of at least one of a base station and a base station subsystem that is in communication service within the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE))", "terminal" and the like are used interchangeably.

In some instances, a mobile station is also referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or some other suitable terminology.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, and the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, a mobile body main body, or the like. The mobile body may be a vehicle (e.g., a vehicle, an airplane, etc.), may be a mobile body that moves in an unmanned manner (e.g., a drone (a drone), an autonomous vehicle, etc.), or may be a robot (manned or unmanned). At least one of the base station and the mobile station further includes a device that does not necessarily move when performing a communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

In addition, the base station in the present disclosure may also be interpreted as a user terminal. For example, the various aspects/embodiments of the present disclosure may also be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (e.g., may also be referred to as Device-to-Device (D2D)), Vehicle networking (V2X), etc.). In this case, the user terminal 20 may have the functions of the base station 10 described above. The expressions such as "uplink" and "downlink" can also be interpreted as expressions (for example, "side") corresponding to communication between terminals. For example, an uplink channel, a downlink channel, and the like may also be interpreted as a side channel.

Likewise, a user terminal in the present disclosure may also be interpreted as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, the operation performed by the base station is sometimes performed by an upper node (upper node) of the base station, depending on the case. Obviously, in a network including one or more network nodes (network nodes) having a base station, various actions performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, considering a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like, but not limited thereto), or a combination thereof.

The embodiments and modes described in the present disclosure may be used alone, may be used in combination, or may be switched to use with execution. Note that, in the embodiments and the embodiments described in the present disclosure, the order of the processes, sequences, flowcharts, and the like may be changed as long as they are not contradictory. For example, elements of various steps are presented in an exemplary order for a method described in the present disclosure, but the present invention is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, fourth generation Mobile communication System (4 generation communication System (4G)), fifth generation Mobile communication System (5G)), Future Radio Access (FRA), New Radio Access Technology (RAT)), New Radio (New Radio trademark (NR)), New Radio Access (NX)), New Radio Access (Future Radio Access), FX), Global Broadband communication System (Global System for Mobile communication (GSM)), and Mobile Broadband communication System (CDMA) (2000 Mobile communication System)), (CDMA, etc.) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra-wideband (uwb), Bluetooth (registered trademark), a system using another appropriate wireless communication method, a next generation system expanded based on these, and the like. Furthermore, multiple systems may also be applied in combination (e.g., LTE or LTE-a, combination with 5G, etc.).

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

Any reference to the use of the terms "first," "second," etc. in this disclosure does not fully define the amount or order of such elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not imply that only two elements may be used or that the first element must somehow override the second element.

The term "determining" as used in this disclosure encompasses a wide variety of actions in some cases. For example, "determination (decision)" may be regarded as a case where "determination (decision)" is performed on determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search, inquiry (query)) (for example, search in a table, a database, or another data structure), confirmation (authenticating), and the like.

The "determination (decision)" may be regarded as a case of "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like.

The "determination (decision)" may be also regarded as a case of performing "determination (decision)" on solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like. That is, "judgment (decision)" may also be regarded as a case where "judgment (decision)" is performed on some actions.

The term "determination (decision)" may be interpreted as "assumption", "expectation", "consideration", and the like.

The "maximum transmission power" described in the present disclosure may mean a maximum value of transmission power, may mean a nominal maximum transmission power (the nominal UE maximum transmission power), and may mean a nominal maximum transmission power (the rated UE maximum transmission power).

The terms "connected" and "coupled" or any variation thereof used in the present disclosure mean all connections or couplings between two or more elements directly or indirectly, and can include a case where one or more intermediate elements exist between two elements "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination of these. For example, "connection" may also be interpreted as "access".

In the present disclosure, where two elements are connected, it can be considered to be "connected" or "joined" to each other using more than one wire, cable, printed electrical connection, etc., and using electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, the optical (both visible and invisible) region, etc., as several non-limiting and non-inclusive examples.

In the present disclosure, the term "a is different from B" may mean "a and B are different from each other". In addition, the term may also mean "a and B are different from C, respectively". The terms "separate", "associated", and the like may likewise be construed as "different".

In the present disclosure, when the terms "including", and "variations thereof are used, these terms are intended to have inclusive meanings as in the term" comprising ". Further, the term "or" used in the present disclosure does not mean exclusive or.

In the present disclosure, for example, in the case where articles are added by translation as in a, an, and the in english, the present disclosure may also include the case where nouns following these articles are plural.

Although the invention according to the present disclosure has been described in detail above, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes and does not have any limiting meaning to the invention to which the present disclosure relates.

The application is based on Japanese patent application 2019-047732 applied on 26.2.2019. These are all included herein.

Claims (6)

1. A user terminal is provided with:

a control unit configured to control generation of a random access preamble sequence having a specific sequence length based on a specific preamble format; and

and a transmitter configured to transmit a part of the random access preamble sequence using a single interlace including a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth, in a carrier to be monitored before transmission.

2. The user terminal of claim 1,

the control unit aborting transmission of a remaining portion of the random access preamble sequence;

the remaining part corresponds to a specific number of subcarriers randomly selected, a specific number of subcarriers of a specific frequency interval, or a specific number of subcarriers from the maximum number among all subcarriers corresponding to the random access preamble sequence.

3. A user terminal is provided with:

a control unit configured to control generation of a random access preamble sequence having a specific sequence length based on a specific preamble format; and

and a transmitting unit configured to transmit the entire random access preamble sequence using a plurality of interlaces each including a plurality of resource blocks arranged at a specific frequency interval within a specific bandwidth, in a carrier to be monitored before transmission.

4. The user terminal of claim 3,

the control unit controls mapping of the random access preamble sequence for the subcarriers constituting the plurality of interlaces according to a specific rule or based on the random access preamble sequence.

5. A wireless communication method for a user terminal, comprising:

a step of controlling generation of a random access preamble sequence of a specific sequence length based on a specific preamble format; and

and transmitting a part of the random access preamble sequence using a single interlace including a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth, in a carrier to be monitored before transmission.

6. A wireless communication method for a user terminal, comprising:

a step of controlling generation of a random access preamble sequence of a specific sequence length based on a specific preamble format; and

and transmitting the entire random access preamble sequence using a plurality of interlaces each including a plurality of resource blocks arranged at a specific frequency interval in a specific bandwidth, in a carrier to be monitored before transmission.

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