CN113692774A

CN113692774A - Terminal and wireless communication method

Info

Publication number: CN113692774A
Application number: CN201980095481.XA
Authority: CN
Inventors: 松村祐辉; 吉冈翔平; 村山大辅; 永田聪
Original assignee: NTT Docomo Inc
Current assignee: NTT Docomo Inc
Priority date: 2019-04-18
Filing date: 2019-04-18
Publication date: 2021-11-23
Also published as: WO2020213128A1

Abstract

One embodiment of the terminal of the present disclosure includes: a control unit that determines a terminal group to which the terminal belongs, based on at least one of information notified from a network and information notified from another terminal; and a transmitting unit configured to determine a UL transmission condition based on information on other terminals included in the terminal group.

Description

Terminal and wireless communication method

Technical Field

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

Background

In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3GPP rel.10-14) is standardized for the purpose of further large capacity, Advanced, and the like of LTE (Third Generation Partnership Project (3GPP)) versions (Release (Rel.))8, 9).

Successor systems of LTE, such as also referred to as a fifth generation mobile communication system (5G), 5G + (plus), New Radio (NR), New Radio access (NX), Future generation Radio access (FX), 3GPP rel.15 and so on, are also being studied.

In LTE (e.g., LTE rel.13 to 15), Internet of Things (Internet of Things) (IoT) which is an object (e.g., a sensor, an object having a Communication function) connected to the Internet and exchanges various data (e.g., measurement data, sensor data, control data, etc.), Machine Type Communication (MTC)), and narrowband field IoT (narrowband Band Internet of Things (NB-IoT)) are being standardized. MTC and NB-IoT, which are introduced in LTE, are also referred to as LTE-IoT and the like.

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TS 36.300V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); (ii) an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

It is assumed that in a future wireless communication system (e.g., NR), all objects (e.g., sensors, objects having a communication function) are connected to the internet, and the number of terminals having a communication function on the network is increasing.

In this case, when scheduling of data is centrally managed on the Network (NW) side, the processing load of the NW increases, and there is a possibility that throughput decreases or communication quality deteriorates.

Accordingly, an object of the present disclosure is to provide a terminal and a wireless communication method capable of suppressing an increase in the processing load of a network.

Means for solving the problems

A terminal according to an aspect of the present disclosure includes: a control unit that determines a terminal group to which the terminal belongs, based on at least one of information notified from a network and information notified from another terminal; and a transmitting unit configured to determine a UL transmission condition based on information on other terminals included in the terminal group.

Effects of the invention

According to one embodiment of the present disclosure, an increase in the processing load of the network can be suppressed.

Drawings

Fig. 1A and 1B are diagrams showing an example of the arrangement of the reservation signal period and the specific signal period.

Fig. 2A and 2B are diagrams showing another example of the arrangement of the reservation signal period and the specific signal period.

Fig. 3 is a diagram showing an example of setting of CW based on the number of terminals included in the terminal group.

Fig. 4 is a diagram showing an example of a bidding-type multiple access method based on the number of terminals included in a terminal group.

Fig. 5A and 5B are diagrams showing an example of a representative terminal determination method.

Fig. 6 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 7 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 8 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

Fig. 9 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

As described above, it is assumed that in a future wireless communication system (for example, NR), all objects (for example, sensors, objects having a communication function) are connected to the internet, and the number of terminals having a communication function on the network increases.

In this case, if scheduling of data of terminals is assumed to be managed centrally on the Network (NW) side as in the conventional system, the processing load of the NW increases. This may cause a reduction in the communication throughput or a reduction in the communication quality.

As a method of suppressing an increase in the processing load on the NW side, at least a part of scheduling (for example, resource allocation and the like) of data by a terminal (or a relay node) is considered. The structure of the control scheduling at the terminal side may also be referred to as local scheduling, local allocation, terminal scheduling, or terminal allocation.

However, in the case of performing local scheduling, how to control terminal operations and the like has not been sufficiently studied.

The present inventors focused on the point that an increase in processing load on the NW side can be suppressed by scheduling at least a part of data by a terminal, and conceived that, as one aspect of the present disclosure, a pair (or group) is set between specific UEs, and UL transmission (or DL reception) is controlled.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The structures described in the embodiments may be used alone or in combination. The communication system to which the present embodiment can be applied is not limited. It can be applied to all communication systems consisting of networks and terminals.

In the present disclosure, a terminal, a User Equipment (UE), a node (node), a relay node, a wireless communication device, an apparatus, and a vehicle (vehicle) may be substituted for each other.

Further, in the present disclosure, reservation, securing, allocation, bidding (japanese: sheaf), acquisition, control, preceding transmission, prior transmission, reference signal transmission, reservation signal transmission may be replaced with each other. In the present disclosure, the advanced signal, advance signal, reservation signal, allocation signal, bid signal, control signal, access signal, random access signal, reference signal, PUSCH, SRS, DMRS, and side-link signal (e.g., psch, PSCCH) may be replaced with each other. In the present disclosure, signals, information, preambles, channels may also be substituted for one another.

(first mode)

In the first embodiment, a case where a terminal pair (pair) is set by a network (e.g., a base station) will be described. The terminal controls at least one of UL transmission and DL reception based on the pair of terminals set from the base station. Pairs may also be replaced with groups in the present disclosure.

The terminals may determine the pair of terminals based on higher layer signaling (for example, RRC signaling) notified from the base station. The decision pair (pair) may also be replaced by a pairing (pairing). Alternatively, the terminal may determine a specific pair candidate from among a plurality of pair candidates set by higher layer signaling based on information notified by the downlink control information.

The base station may determine a terminal group to which a specific terminal belongs based on proximity information (also referred to as UE-UE distance information) between the specific terminal and another terminal, and notify the specific terminal of information related to the terminal group. The information related to the terminal group may also include at least one of information related to a group index to which the specific terminal belongs and information related to other terminals included in the group to which the specific terminal belongs.

Each terminal may transmit or report information between the terminal and another terminal (for example, information related to a distance between the terminal and another terminal) to the base station. For example, each terminal may report information in which an index of another terminal close to the terminal is associated with at least one of the received power and the estimated distance. Alternatively, each terminal may report an index list of other terminals close to the terminal itself, or may report information on the number of other terminals close to the terminal. Each terminal may include a terminal index corresponding to the terminal in the reported information.

The terminal index (or UE index) may be an index different from the C-RNTI set in the cell. For example, the terminal index may be an index (also referred to as a local index, a local ID, or a local UE ID) selected or numbered by the reporting terminal itself. Each local ID may also be associated with a particular sequence index (or resource index), respectively.

Information related to the distance to other terminals may also be decided based on signals transmitted from other terminals (e.g., distance estimation signals). For example, the specific terminal may also estimate the distance between the specific terminal and the other terminals based on the received power of the distance estimation signal (or the resource corresponding to the distance estimation signal) transmitted from the other terminals. That is, each terminal acquires the reception power of a resource corresponding to a signal received from another terminal and reports the acquired information to the network.

The condition of the distance estimation signal transmitted by the terminal may also be set from the network. The transmission of the distance estimation signal may also be set to be periodic, semi-persistent, or aperiodic. The distance estimation signal may be transmitted using an uplink shared channel, an uplink control channel, or a beacon signal. Further, the presence or absence of transmission of the distance estimation signal, the transmission condition, and the like may be instructed from a specific terminal (e.g., representative terminal) to another terminal. The terminal to which the transmission of the distance estimation signal is set may transmit the distance estimation signal with a transmission power smaller than that of the uplink shared channel or the uplink control channel used for transmission of another signal (e.g., data).

The resource may be replaced with a sequence index and the received power may be replaced with an estimated distance. It is also considered that a specific terminal cannot specify a terminal corresponding to a resource for receiving a signal without being notified of which terminal a resource for receiving a signal from another terminal corresponds to. In this case, the specific terminal may report using the local ID numbered by the terminal as the terminal index. As described above, each local ID may be associated with a specific sequence index (or resource index).

The base station may set or notify a terminal group to a specific terminal, and transmit at least one of an UL grant and a DL assignment to the terminal group. In this case, the base station may set or reserve a specific resource for the terminal group. That is, a common resource may be set in units of terminal groups.

A representative terminal that controls scheduling for terminals included in the terminal group may be set in the terminal group. The representative terminal may also be referred to as a Head terminal, a Head UE, or a Head UE. Alternatively, the transmission/reception of each terminal may be controlled without setting a representative terminal in the terminal group. In the following, an example of a terminal operation in a case where the representative terminal is not set in the terminal group and a terminal operation in a case where the representative terminal is set is shown.

< do not set representative terminal >

In the case where the representative terminal is not set in the terminal group, the terminal may control the UL transmission operation based on at least one of the presence or absence of another terminal included in the terminal group and the number of terminals included in the terminal group. The UL transmission operation may also be at least one of a transmission condition of the UL, a transmission method, and a parameter applied in the UL transmission.

(situation where other terminals cannot be identified)

The terminal may apply the autonomous extension type multiple access method when it cannot determine whether or not another terminal exists in the terminal group to which the terminal belongs (for example, when it is not notified from the network). As the autonomous expansion type multiple access system, for example, a wireless Local Area Network (LAN) system may be applied.

In the wireless LAN system, Carrier Sense Multiple Access (CSMA)/Collision Avoidance (CA)) is employed for the purpose of Collision Avoidance and/or interference control. In CSMA/CA, a specific time (Distributed access Inter Frame Space (DIFS)) is set before transmission), and a transmitting apparatus performs data transmission after confirming that (carrier sense, Listen Before Talk (LBT)) there is no other transmission signal in the DIFS.

After data transmission, the receiving apparatus waits for an acknowledgement (ack) from the receiving apparatus. When the transmitting apparatus cannot receive the ACK within a specific time, it determines that a collision has occurred and retransmits the collision. If the transmitting apparatus detects another transmission signal before transmission, and then starts data transmission over a DIFS and a backoff period (e.g., random backoff) without detecting another transmission signal.

In addition, carrier sensing, LBT, sensing (listening), Clear Channel Assessment (CCA), sensing of a Channel (sensing), or Channel access operation (Channel access procedure) may be replaced with each other.

Alternatively, the terminal may apply other autonomous expansion type multiple access schemes. Other autonomous spread multiple access methods may be as follows: the first signal transmission is performed in the first period, and whether or not to perform the second signal transmission in the second period is determined based on the priority of the first signal transmission. This other autonomous expansion type multiple access method may also be referred to as a bid-style multiple access method.

In the case of applying the bid-type multiple access scheme, the terminal may transmit the reservation signal in the first period (e.g., the reservation signal period or the reservation signal time interval) and transmit the specific signal in the second period (e.g., the specific signal period or the specific signal time interval). The reservation signal may be a signal for reserving a resource of the subsequent specific signal, or may be a signal that precedes (is transmitted in advance) transmission of the specific signal.

The time resource for transmitting the reservation signal may be configured (set, inserted, mapped (map)) earlier than the time resource for transmitting the specific signal. The time resource for transmitting the reservation signal may also be a reservation signal time interval, symbol, mini-slot, subframe, etc. The time resource for transmitting the specific signal may also be a specific signal time interval, symbol, mini-slot, subframe, transmission opportunity, etc.

The reservation signal period including more than one reservation signal time interval may be configured within the periodic time interval. A specific signal period including one or more specific signal time intervals may be arranged in the periodic time interval. The reserved signal period may be configured earlier than the specific signal period. The time interval may be any one of a frame, a subframe, a slot, and a mini-slot.

For example, as shown in fig. 1A, the reservation signal period and the specific signal period may be configured in one slot. The reservation signal period may also comprise four reservation signal time intervals. Each reservation signal time interval may also be one symbol. The specific signal period may include four specific signal time intervals. The time length of each specific signal time interval may also be one symbol. The subcarrier spacing (SCS) in the reserved signal period may also be equal to the SCS in the specific signal period.

It is also possible to configure the reservation signal period in a certain time interval and set the specific signal period in the same time interval. It is also possible to configure the reservation signal period in a certain time interval and configure the specific signal period in other time intervals.

The reservation signal may also be transmitted in one symbol and a specific bandwidth. The specific bandwidth may be specified by a specification or may be set by higher layer signaling. The specific bandwidth may be one Resource Block (RB), a bandwidth part (BWP), or other bandwidths.

The terminal may also transmit the reservation signal using the same sub-carrier spacing (SCS) as that of the specific signal. The terminal may also transmit the reservation signal using a different SCS from the SCS of the specific signal. The SCS of the reserved signal may also be higher than the SCS of the specific signal.

The information related to at least one of the SCS during the reservation signal, the SCS during the specific signal, and the ratio of the SCS during the reservation signal to the SCS during the specific signal (for example, the ratio of the SCS during the reservation signal to the SCS during the specific signal) may be predetermined by a specification, or may be set by a notification (for example, higher layer signaling) from the network (NW, for example, a base station).

The minimum time required for switching from the SCS of the reserved signal to the SCS of the specific signal may also be specified by specifications. The terminal may not perform signaling in the SCS switching.

For example, as shown in fig. 1B, the SCS in the reserved signal period may also be higher than the SCS in the specific signal period. That is, the symbol length in the reserved signal period may be shorter than the symbol length in the specific signal period. A gap (gap) (non-transmittable period) may be provided between the reserved signal period and the specific signal period. The time length of the gap may be longer than the time required for switching of the SCS.

The SCS of the reserved signal is higher than that of the specific signal, so that the overhead of the reserved signal can be suppressed, the time interval of the reserved signal and the period of the reserved signal are shortened, and the utilization efficiency of resources can be improved.

As shown in fig. 2A, a gap may also be provided between the reservation signal period and the specific signal period. The time length of the gap may be equal to or longer than a time required for processing from the reception of the reservation signal from another terminal to the transmission of the specific signal.

As shown in fig. 2B, a gap may also be provided between the reserved signal time intervals. The time length of the gap may be equal to or longer than the time required for the processing from the reception of the reservation signal from another terminal to the transmission of the specific signal of the terminal itself.

In this way, the specific signal can be reserved by transmitting the reservation signal from each terminal without scheduling the specific signal by the NW.

"situation in which other terminals can be identified

In a case where a specific terminal can determine whether or not another terminal exists in the terminal group (for example, in a case where information of another terminal is notified from the network), the condition or parameter of the autonomous extended multiple access method may be set to a specific value and applied.

For example, the specific terminal may determine the conditions or parameters of the autonomous spread multiple access scheme based on the number of terminals included in the terminal group. The base station may notify each terminal of information on the number of terminals included in the terminal group.

For example, when the number of terminals included in the terminal group is equal to or greater than a specific value (or, when the number is greater than the specific value), at least one of the number of slots to be backed off and the number of symbols may be set to be greater than the specific value. When CSMA/CA is applied as the multiple access method, the value of the Contention Window (CW) (for example, the value of the CW that is transmitted for the first time) may be set to a value larger than a specific value. This makes it possible to suppress collisions between a plurality of terminals included in the terminal group.

As the multiple access method, in the case of applying the bid-style multiple access method, the bid section (reservation signal section) may be set to a value larger than a specific value.

On the other hand, in the case where the number of terminals included in the terminal group is smaller than a specific value (or equal to or smaller than the specific value), or in the case where the terminals included in the terminal group are only the own terminal, at least one of the number of slots and the number of symbols to be backed off may be set to be equal to or smaller than the specific value.

In the case where CSMA/CA is applied as a multiple access method, the value of CW may also be set to a value smaller than a specific value (or, CW is not present) from the initial transmission (see fig. 3). In fig. 3, a case where a terminal controls transmission of a data channel or a control channel in the absence of CW (or CW ═ 0) in the case where the number of terminals included in a terminal group is less than a certain value is shown. This can suppress a delay in transmission of the specific terminal.

As the multiple access method, in the case of applying the bid-style multiple access method, the bid section (reservation signal section) may also be set to a value smaller than a specific value (or, there is no bid section) (see fig. 4). In fig. 4, a case is shown where a terminal #1 controls transmission of a data channel or a control channel in the absence of a reservation signal transmission symbol (or, a reservation signal transmission symbol of 0) in the case where the number of terminals included in a terminal group is less than a certain value. Thus, the terminal can transmit at least one of the data and the control channel during the time period for bidding.

< having representative terminal >

When the representative terminal is set in the terminal group, the base station may specify the representative terminal. The base station may be configured to control a transmission instruction (for example, a permission) to the terminals included in the terminal group, for the representative terminal. The delegate terminal may also schedule (or allocate resources to) the peripheral terminals.

The representative terminal may also be decided based on a specific condition. For example, a terminal that can identify (or detect, discover, monitor) the other terminals at the most among the terminals included in the terminal group may be set as the representative terminal. The representative terminal set in the same terminal group may be one or a plurality of terminals.

The representative terminals in a particular terminal group may also be changed or updated based on particular conditions. For example, when information such as the number of other terminals that can be recognized by each terminal included in a specific terminal group for each specific period is reported to the base station, the base station may change the representative terminal based on the information reported from each terminal. The base station may notify the representative terminal of the change without changing the representative terminal.

Further, the representative terminal may request the base station to change the representative terminal when a specific condition is met (for example, the number of other terminals that can be identified is equal to or less than a specific value). The base station may change the representative terminal based on a request from the representative terminal.

In this manner, the load on the base station side can be reduced by controlling the scheduling (or resource allocation) of other terminals by the representative terminal. In addition, by setting a terminal satisfying a specific condition as a representative terminal in the terminal group, scheduling of a large number of terminals can be appropriately performed. Further, by controlling the determination or change of the representative terminal based on a specific condition or a specific cycle, it is possible to select an appropriate terminal as the representative terminal according to the communication environment.

(second mode)

In the second embodiment, a case where a pair (pair) with another terminal is set is described. That is, the pair of terminals may not be set from the network (e.g., base station).

In this case, the terminal may also select a pair (or group) by itself. For the group selection, for example, when the distance between terminals is equal to or smaller than a specific value (or the power of a signal from another terminal is equal to or larger than a specific value), the terminals may form a group with each other. Alternatively, each terminal may determine a terminal to form a group based on the position information of another terminal notified from another terminal or the base station.

When each terminal selects a terminal group, it may decide to join a specific terminal group according to the judgment of each terminal itself. In this case, each terminal may notify at least one of the base station and the other terminals of information for announcing joining of the specific terminal group. Alternatively, each terminal may determine a terminal group to be added based on an instruction from another terminal (e.g., a representative terminal).

In the terminal group, a representative terminal that controls scheduling for terminals included in the terminal group may be set. Hereinafter, an example of a terminal operation in a case where the representative terminal is not set in the terminal group and a terminal operation in a case where the representative terminal is set is described.

< No representative terminal >

(situation where other terminals cannot be identified)

The specific terminal may apply the autonomous expansion type multiple access method when it cannot determine whether or not another terminal exists in the terminal group (for example, when it is not notified from the network). As the autonomous expansion type multiple access method, at least one of CSMA/CA and bid-style multiple access methods may be applied.

CSMA/CA and the bid-style multiple access method can also be applied to the contents shown in the first method.

"situation in which other terminals can be identified

The specific terminal may set the condition or parameter of the autonomous spread multiple access method to a specific value and apply the condition or parameter to the specific value when it is possible to determine whether or not another terminal exists in the terminal group (for example, when information of another terminal is notified from the network).

For example, the specific terminal may determine the conditions or parameters of the autonomous spread multiple access scheme based on the number of terminals included in the terminal group.

For example, when the number of terminals included in the terminal group is equal to or greater than a specific value (or, when the number is greater than the specific value), at least one of the number of slots to be backed off and the number of symbols may be set to be greater than the specific value. When CSMA/CA is applied as the multiple access method, the value of CW (for example, the value of CW that is transmitted for the first time) may be set to a value larger than a specific value. This makes it possible to suppress collisions between a plurality of terminals included in the terminal group.

In the case where the bid-style multiple access method is applied as the multiple access method, the bid section (reservation signal section) may be set to a value larger than a specific value.

On the other hand, in the case where the number of terminals included in the terminal group is smaller than a specific value (or equal to or smaller than the specific value), or in the case where the terminal included in the terminal group is only the own terminal, at least one of the number of slots and the number of symbols to be backed off may be set to be equal to or smaller than the specific value.

In the case where CSMA/CA is applied as a multiple access method, the value of CW may also be set to a value smaller than a specific value (or, CW is not present) from the initial transmission (see fig. 3). This can suppress a delay in transmission of the specific terminal.

In the case where the bid-style multiple access method is applied as the multiple access method, the bid section (reservation signal section) may also be set to a value smaller than a specific value (or, there is no bid section) (see fig. 4). Thereby, the terminal can transmit at least one of the data and the control channel during the time period for bidding.

Information on the number of terminals included in the terminal group may be notified from the base station to each terminal.

< having representative terminal >

When the representative terminal is set in the terminal group, the representative terminal may be determined based on a specific condition. For example, a part of terminals among the terminal group may also designate representative terminals. Alternatively, the terminal itself may notify a message (for example, participation (japanese: standing assist) or bid (japanese: entered). When a plurality of terminals participate in the selection or the bidding, a terminal to be a representative terminal may be determined based on a specific priority.

A terminal that becomes a representative terminal may also have a scheduling (or resource allocation) authority for terminals included in the terminal group. In this case, the representative terminal may control scheduling for each terminal included in the terminal group.

[ determination of representative terminal ]

The specific information reported from each terminal may be shared among a plurality of terminals included in the terminal group, and the representative terminal may be determined based on the specific information shared among the terminals.

The specific information reported from each terminal may also be associated information (e.g., a list of terminal indexes and received powers) of the terminal index and the received power (or estimated distance). The terminal index may also be replaced with at least one of a sequence index, a cyclic shift index (CS index), a resource index (e.g., RB index), an RNTI, and a local index.

Alternatively, the specific information reported from each terminal may be information related to the number of other terminals in the vicinity of the terminal. The other terminal that is close to may be determined based on the received power of the signal transmitted from the other terminal (for example, count when the received power is equal to or greater than a predetermined value).

Alternatively, the specific information reported from each terminal may be information related to whether a specific number of terminals (e.g., all terminals) within the terminal group can be identified (or detected, discovered, monitored).

For example, each terminal included in the terminal group may report the specific information in a specific period, and a terminal that can recognize the other terminals at the maximum (or a terminal that recognizes the largest number of terminals) may be determined as the representative terminal. When there are a plurality of terminals that become candidates for the representative terminal, the representative terminal may be determined based on other conditions.

Other conditions may also be, for example, the chronological order in which particular information is reported. For example, when there are a plurality of terminals that can recognize the other terminals at the maximum, the terminal that has reported first (or earlier) may be set as the representative terminal (see fig. 5A).

Fig. 5A shows an example of a case where terminals #0 to #3 sequentially report specific information in a specific transmission interval (for example, a transmission interval of a participation signal). Here, the case where the number of other terminals that can be recognized by terminal #0 is 1, the number of other terminals that can be recognized by terminal #1 is 3, the number of other terminals that can be recognized by terminal #2 is 3, and the number of other terminals that can be recognized by terminal #3 is 2 is shown.

In this case, the terminal with the largest number of other terminals (candidate for the representative terminal) that can be recognized is the terminal #1 and the terminal #2, but the terminal #1 that reports the specific information earlier than the terminal #2 may be the representative terminal. Thus, even when there are a plurality of representative terminal candidates, a specific terminal can be selected as a representative terminal.

In addition, fig. 5A shows a case where a terminal that has reported first (or earlier) is set as a representative terminal, but a terminal that has reported last (or later) (terminal #2 in fig. 5A) may be set as a representative terminal.

Each terminal may be controlled not to report specific information when a value larger than the number of identified terminals reported by the terminal is reported from another terminal. For example, in fig. 5B, terminal #3 may control not to report specific information. This reduces unnecessary reports from each terminal.

Further, a particular terminal may also report (or share among UEs) information related to which terminal was identified.

For example, the specific terminal may include information related to the identified other terminal in a data modulation signal multiplexed with a demodulation reference signal (DMRS) and transmit the data modulation signal. Alternatively, the specific terminal may transmit the information related to the identified other terminal using at least one of the resource and the sequence corresponding to the identified other terminal. In this case, the association between the terminal and at least one of the plurality of sequences and resources may be set in advance, and the association information may be notified to each terminal.

Further, as for the index corresponding to another terminal that can be identified, at least one of a sequence index, a cyclic shift index (CS index), a resource index (for example, RB index), RNTI, and a local index may be used.

The representative terminal may be appropriately changed. For example, in a specific terminal group, the representative terminal may be determined or changed periodically. Alternatively, when the representative terminal meets a specific condition (for example, the number of other terminals that can be identified is equal to or less than a specific value), the change of the representative terminal may be requested from other terminals included in the terminal group. The other terminal may change the representative terminal based on a specific condition when there is a request from the representative terminal.

In this manner, by controlling the determination or change of the representative terminal based on the specific period or the specific condition, it is possible to select an appropriate terminal as the representative terminal according to the communication environment.

(variation 1)

As described above, when the representative terminal is set in the terminal group, the representative terminal may control scheduling (e.g., resource allocation) of another terminal. In this case, when another terminal desires UL transmission, a scheduling request may be transmitted from the other terminal to the representative terminal.

In this case, the representative terminal may also control the transmission power of the other terminals. For example, the representative terminals (reception points) may be controlled so that the values of the reception powers of the scheduling requests transmitted from the respective terminals to the representative terminals are equal (for example, fall within a specific range).

This improves the orthogonality of the quasi-orthogonal sequences of the scheduling requests transmitted from the terminals, thereby improving the reception characteristics in the representative terminals. In addition, even when the structure of the receiver in the representative terminal is simplified, the necessary reception characteristics can be maintained.

For example, the representative terminal calculates or decides the transmission power of the signal transmitted from each terminal to the representative terminal or a correction value of the transmission power based on at least one of the signal for distance estimation and the signal for report of specific information transmitted from each terminal. The signal used for distance estimation may also be referred to as a distance estimation signal. The signals used for the reporting of specific information may also be referred to as participation signals.

The representative terminal may calculate a correction value of the transmission power by using, for example, the following equation (1).

Formula (1)

Δp_m＝α×(min(p_i|i＝0，1，2，…，n)-p_m

Δp_m: correction value of transmission power of terminal # m

p_m: received power of signals transmitted from other terminals

n: number of terminals scheduled by representing terminals

α: and (4) the coefficient.

In expression (1), α may be a fixed value determined by the NW or a fixed value held by the representative terminal.

The method of determining the correction value of the transmission power is not limited to the method using equation (1). It may also be determined based on the best reception quality (e.g., the minimum BER, BLER, or PER) through machine learning or deep learning (e.g., AI).

The representative terminal may notify information related to the calculated transmission power or the correction value of the transmission power to another terminal using a control channel, a shared channel, or the like. For example, the representative terminal may notify information (correction value or the like) related to the transmission power by using a TPC command for an uplink shared channel (PUSCH) or an uplink control channel (PUCCH).

In the case where information related to transmission power is notified to other terminals using TPC commands, the other terminals may also interpret the values of existing TPC commands for PUSCH or PUCCH based on a specific rule. For example, the other terminal may perform processing (multiplying by a specific multiple) of a specific number of times on the value of the TPC command notified from the representative terminal and apply the result. For example, when the notified TPC command value is +1dB, it can be interpreted as +5 dB.

Alternatively, the representative terminal may notify the other terminals of the information related to the transmission power using a field different from the TPC command field. For example, the representative terminal may notify information related to transmission power using a new field composed of a specific number of bits different from a field of existing Downlink Control Information (DCI) or a specific field of a new DCI format.

(variation 2)

The terminal (representative terminal or other terminal) may transmit UL data by determining it by the terminal itself, instead of transmitting UL data based on an instruction (e.g., UL grant) from the network. In this case, the network may also give a permission in advance for the terminal to use at least a part of the PUSCH (or PUSCH resource). The terminal may also assume UL transmission for which a usage grant of at least a portion of the PUSCH (or PUSCH resources) is given.

Before the terminal itself transmits UL data, the network may be notified of the transmission of UL data (for example, UL data transmission announcement). For example, the terminal may notify the network of the fact that UL data is transmitted using physical layer control information such as DCI, and the network may make a reception determination using specific CRC bits.

When the terminal notifies that UL data is to be transmitted or when UL data is to be transmitted without notifying that UL data is to be transmitted, the network may determine whether or not the terminal transmits a signal by determining the reception power of a resource to be transmitted from the terminal. The resource for the network to determine the reception power may be all UL data transmission resources that can transmit UL data, or may be a part of the resources (for example, resources for DMRS).

In the above configuration, the inter-terminal communication may be performed by replacing DL or UL with a Side Link (SL) used for the inter-terminal communication. In this case, the communication between the representative terminal and the other terminals may also apply signals or channels defined for sidelink.

(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 one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.

Fig. 6 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 (less 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) donor (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. In addition, the PDSCH may be replaced with DL data and the PUSCH may be replaced with UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (searchspace) 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.

One search space may also correspond to PDCCH candidates corresponding 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. 7 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 in one or more numbers.

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, the transmission/reception unit 120 may transmit information on a terminal group to which each terminal belongs. Furthermore, transmission/reception section 120 may receive, from each terminal, information related to the distance to another terminal or the transmission power of a signal transmitted from another terminal. Furthermore, transmission/reception section 120 may transmit information on the representative terminal to each terminal.

Control section 110 may determine a terminal group to which each terminal belongs based on information reported from each terminal. In addition, the control unit 110 may also determine a representative terminal in the terminal group.

(user terminal)

Fig. 8 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 with one or more antennas.

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 transmission/reception 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. For a certain channel (e.g., PUSCH), when transform precoding is active (enabled), 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, and 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.

In addition, 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 and the transmitting/receiving antenna 230.

Further, the transmission/reception section 220 may determine the UL transmission conditions based on information on other terminals included in the terminal group. Further, the transmission/reception unit 220 may receive information on a terminal group to which each terminal belongs. Furthermore, transmission/reception section 220 may transmit information on the distance to another terminal or the transmission power of a signal transmitted from another terminal to each terminal. Further, transmission/reception section 220 may receive information on the representative terminal from each terminal. Further, the transmission/reception section 220 may perform UL transmission under a specific condition based on information on other terminals included in the terminal group.

The control unit 210 may determine the terminal group to which the terminal belongs, based on at least one of information notified from the network and information notified from another terminal. Further, control section 210 may determine the UL transmission condition based on at least one of the number of terminals included in the terminal group and the terminal type.

When the representative terminal is set in the terminal group, control section 210 may control UL transmission according to scheduling based on the representative terminal. Further, control section 210 may determine a terminal that recognizes at most other terminals as a representative terminal. Further, control section 210 may determine the transmission power of the UL signal to be transmitted to the representative terminal based on the information on the transmission power from the representative terminal.

(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. 9 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. Further, the processor 1001 may be implemented by 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, for example, at least one of a flexible disk (flexible Disc), a Floppy (registered trademark) disk, an optical disk (e.g., a Compact Disc read only memory (CD-ROM)) or the like), a digital versatile Disc (dvd), a Blu-ray (registered trademark) disk, 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, or another suitable storage medium.

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 subframe may also be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

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 may also be made up 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 replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than that of 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 (BWP for UL) and DL BWP (BWP for DL). 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 replaced with "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. The 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, whether referred to as software (software), firmware (firmware), middleware-ware (middle-ware), microcode (micro-code), hardware description language, or by other names, should be broadly construed to mean instructions, instruction sets, code (code), code segments (code segments), program code (program code), programs (program), subroutines (sub-program), software modules (software module), applications (application), software applications (software application), software packages (software packages), routines (routine), subroutines (sub-routine), objects (object), executables, threads of execution, processes, functions, or the like.

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", "Quasi-Co-location (qcl)", "Transmission Configuration 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)", "wireless Base Station", "fixed Station (fixed Station)", "NodeB", "enb (enodeb)", "gnb (gtnodeb)", "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 indoor base station (Remote Radio Head (RRH))). 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 can be 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 replaced with 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" may be replaced with expressions (for example, "side") corresponding to inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

Likewise, the user terminal in the present disclosure may also be replaced with 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), Global Broadband communication system (FX), Global Mobile communication system (Global system for Mobile (GSM), Mobile SUPER Mobile station (GSM) registration (2000), CDMA (CDMA))), and wireless communication systems (LTE-a), LTE-Advanced (LTE-B), and wireless communication systems (5G), and wireless communication systems (New Radio Access (ra, Mobile station (FX)) 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 "determination (decision)" may be replaced with "assumption", "expectation", "consideration", and the like.

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, "connect" may also be replaced with "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.

Claims

1. A terminal, characterized by having:

a control unit that determines a terminal group to which the terminal belongs, based on at least one of information notified from a network and information notified from another terminal; and

and a transmitting unit configured to determine a UL transmission condition based on information on another terminal included in the terminal group.

2. The terminal of claim 1,

the control unit determines the UL transmission condition based on at least one of the number of terminals and the terminal type included in the terminal group.

3. The user terminal of claim 1,

the control unit controls the UL transmission according to scheduling based on the representative terminal when the representative terminal is set in the terminal group.

4. The user terminal of claim 3,

the control unit determines the representative terminal based on the identified number of other terminals.

5. The user terminal of claim 3 or claim 4,

the control unit determines the transmission power of the UL signal to be transmitted to the representative terminal based on the information on the transmission power from the representative terminal.

6. A wireless communication method, comprising:

a step of determining a terminal group to which the terminal belongs, based on at least one of information notified from the network and information notified from another terminal; and

and determining a condition for UL transmission based on information on other terminals included in the terminal group.