WO2019155637A1 - Transmission device, reception device, and radio communication method - Google Patents

Abstract

In order to properly perform repetitive transmission, an embodiment of the transmission device of the present disclosure is characterized by having: a transmission unit for repeatedly transmitting a physical shared channel in a predetermined symbol length during one slot period and/or a period extending over multiple slots; and a control unit for controlling transmission such that transmission of each physical shared channel to be repeatedly transmitted will not be performed across a slot boundary.

Description

Transmitting apparatus, receiving apparatus, and wireless communication method

The present invention relates to a transmission device, a reception device, and a wireless communication method in a next-generation mobile communication system.

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of further high data rate, low delay, etc. (Non-patent Document 1). In addition, LTE-A (LTE Advanced, LTE Rel. 10, 11, 12, 13) was specified for the purpose of further increasing the capacity and sophistication of LTE (LTE Rel. 8, 9).

LTE successor systems (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE Also referred to as Rel.

In an existing LTE system (for example, LTE Rel. 8-13), a 1 ms subframe (also referred to as a transmission time interval (TTI), etc.) is used for downlink (DL) and / or uplink. Communication of a link (UL: Uplink) is performed. The subframe is a transmission time unit of one channel-encoded data packet, and is a processing unit such as scheduling, link adaptation, retransmission control (HARQ: Hybrid Automatic Repeat reQuest).

In addition, a radio base station (for example, eNB (eNode B)) controls data allocation (scheduling) to user terminals (UE: User Equipment), and uses downlink control information (DCI) to control data transmission. A scheduling instruction is notified to the UE. For example, a UE compliant with existing LTE (for example, LTE Rel. 8-13) receives a sub-station after a predetermined period (for example, 4 ms) when receiving DCI (also called UL grant) instructing UL transmission. UL data is transmitted in a frame.

In future wireless communication systems (for example, NR), it is considered to control data scheduling in units of a predetermined period (for example, slot). Alternatively, it has been studied to control data scheduling in units of one or more symbols included in a slot (for example, also referred to as a mini-slot).

Also, in NR, it is considered to perform repetition transmission in slot unit scheduling (slot base scheduling) and / or mini slot unit scheduling (mini slot base scheduling).

For example, it is conceivable that data is repeatedly transmitted (mini-slot repetition) in a predetermined period by applying mini-slot base scheduling. On the other hand, sufficient studies have not yet been made on how to control repeated transmission of each data (for example, allocation of time resources used for transmission). If repeated transmission is not appropriately performed, there is a possibility that communication throughput and / or communication quality may deteriorate.

Therefore, an object of the present disclosure is to provide a transmission device, a reception device, and a wireless communication method that can appropriately perform repeated transmission.

A transmission apparatus according to an aspect of the present invention includes a transmission unit that repeatedly transmits a physical shared channel with a predetermined symbol length in at least one of a one-slot period and a plurality of slots, and each physical to which repeated transmission is applied. And a control unit that controls the transmission so that the transmission of the shared channel does not cross the slot boundary.

According to the present invention, repeated transmission can be appropriately performed.

1A and 1B are diagrams illustrating an example of repeated transmission control in the first mode. 2A and 2B are diagrams illustrating another example of repeated transmission control in the first mode. FIG. 3 is a diagram illustrating an example of repeated transmission control in the second mode. 4A to 4C are diagrams illustrating an example of repeated transmission control in the third mode. FIG. 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. FIG. 6 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention. FIG. 7 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention. FIG. 8 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention. FIG. 9 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention. FIG. 10 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention.

In future wireless communication systems (for example, LTE Rel. 14, 15 and later, 5G, NR, etc., hereinafter also referred to as NR), data and the like are transmitted using slot-based scheduling and minislot-based scheduling. It is being considered.

A slot is one of basic transmission units, and one slot is composed of a predetermined number of symbols. For example, in normal CP, the slot period is composed of a first number of symbols (for example, 14 symbols), and in extended CP (extended CP), the slot period is composed of a second number of symbols (for example, 12 symbols). Is done.

A minislot corresponds to a period composed of a number of symbols equal to or less than a predetermined value (for example, 14 symbols (or 12 symbols). As an example, in DL transmission (for example, PDSCH transmission), a minislot has a predetermined number ( For example, the number of symbols may be 2, 4 or 7.

The slot-based scheduling (type A) and the mini-slot base scheduling (type B) may be configured such that different resource allocation methods are applied.

Assume a case where slot-based scheduling (also referred to as PDSCH mapping type A) is applied in DL (for example, PDSCH transmission). In this case, the PDSCH start position in the slot is selected from preset candidate symbols, and the number of PDSCH allocation symbols (PDSCH length) is selected from a range from a predetermined value (X) to 14. Candidate symbols that are candidates for the start position correspond to, for example, predetermined symbol indexes (for example, # 0, # 1, # 2, and # 3) in the slot.

Assume a case where minislot-based scheduling (also referred to as PDSCH mapping type B) is applied in DL (for example, PDSCH transmission). In this case, the number of PDSCH allocation symbols (PDSCH length) is selected from a preset number of candidate symbols, and the PDSCH start position in the slot is set to any location (symbol) in the slot. The number of PDSCH-length candidate symbols corresponds to, for example, a predetermined number (2, 4, or 7 symbols). That is, the PDSCH start position is set flexibly.

Suppose a case in which slot-based scheduling (also referred to as PUSCH mapping type A) is applied in UL (for example, PUSCH transmission). In this case, the PDSCH start position in the slot is selected from preset candidate symbols (for example, predetermined symbol index # 0), and the number of PDSCH allocation symbols (PDSCH length) is within a range from a predetermined value (Y) to 14. Selected.

It is assumed that mini-slot based scheduling (also referred to as PUSCH mapping type B) is applied in UL (for example, PUSCH transmission). In this case, the number of PDSCH allocated symbols (PDSCH length) is selected from a preset number of candidate symbols (1 to 14 symbols), and the start position of PDSCH in the slot is set to any location (symbol) in the slot. . That is, the PDSCH start position is set flexibly.

Thus, the minislot-based scheduling may be PDSCH and / or PUSCH transmission that is configured with 2, 4, or 7 symbols and can flexibly set the start symbol position. On the other hand, a PDSCH that is not mini-slot-based scheduling may be a PDSCH having a start symbol position of the 0th to 3rd symbols in the slot and having a predetermined symbol length or more. A PUSCH that is not mini-slot-based scheduling may be a PUSCH having a start symbol position of the 0th symbol in the slot and having a predetermined symbol length or more.

PDSCH and PUSCH that are not minislot-based scheduling may be referred to as PDSCH / PUSCH mapping type A, and PDSCH and PUSCH that are minislot-based scheduling may be referred to as PDSCH / PUSCH mapping type B. Also, DMRSs may be inserted at different positions according to the PDSCH / PUSCH mapping type. Furthermore, which mapping type PDSCH / PUSCH is used may be set by higher layer signaling such as RRC, may be notified by DCI, or may be recognized by a combination of both. Also good.

Also, in NR, it is considered to apply repeated transmission in data transmission. For example, the base station repeatedly transmits DL data (for example, downlink shared channel (PDSCH)) a predetermined number of times. Alternatively, the UE repeatedly performs UL data (for example, uplink shared channel (PUSCH)) a predetermined number of times.

When slot-based scheduling is applied, it is conceivable that data is allocated to each slot over a plurality of slots and is repeatedly transmitted (inter-slot repetition). In slot-based scheduling, data allocation is controlled on a slot basis (within each slot), so that data is not allocated across slot boundaries.

On the other hand, when minislot-based scheduling is applied, data is repeatedly transmitted in units of a predetermined number of symbols. Therefore, depending on the number of repeated transmissions (for example, K), a data allocation unit (data length of each repeated transmission), a period during which repeated transmission is applied, etc., one transmission among a plurality of repeated transmissions (data allocation) A case occurs where (data allocation) crosses a slot-boundary.

Since the slot is used as a basic unit of transmission, when allocation of data or the like crosses the boundary of the slot, collision with other signals and / or channels occurs, transmission power control becomes complicated, and communication throughput is increased. And / or there is a risk of degradation of communication quality.

Accordingly, the present inventors have conceived that when repeated transmission is applied to data scheduled on a mini-slot basis, control is performed so that each piece of repeatedly transmitted data is not (or does not cross) a slot boundary. .

Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The wireless communication method according to each embodiment may be applied independently or in combination.

In the following embodiments, an arbitrary signal and channel may be read with a prefix of “NR−” indicating that it is for NR. Further, in the following description, repeated transmission of DL data (PDSCH) in DL is taken as an example, but the present invention can be similarly applied to repeated transmission of UL data (PUSCH) in UL. Further, the following embodiments may be applied to repetitive transmission of signals and / or channels other than data.

In the following description, a base station that transmits DL data in DL and / or a UE that transmits UL data in UL may be read as a transmitting device. Also, a base station that receives UL data in DL and / or a UE that transmits DL data in DL may be read as a receiving device.

(First aspect)
In the first aspect, when there is data transmission arranged across slot boundaries in repeated transmission of data (or physical shared channel), transmission is controlled so that the data transmission does not cross slot boundaries.

To prevent the data transmission from crossing the slot boundary, drop the data transmission or apply puncture and / or rate matching processing to a part of the data and place it only in one of the slots. Control.

<Drop processing>
FIG. 1 shows an example in which data (or physical shared channel) to which minislot-based scheduling is applied is repeatedly transmitted. Here, a case is shown in which data transmission with a data length of 4 symbols is repeated 4 times over 2 slots. The data length is not limited to 4 symbols, but may be other values (for example, 2 symbols or 7 symbols). The number of data repetitions (K) is not limited to four, and may be another value.

At least one of information indicating a start symbol of data (K = 1) (for example, S = 3 indicating offset), information regarding a data length (for example, L = 4), information regarding the number of repetitions, and the like from the base station to the UE May be notified. The data length may be read as PDSCH length or PUSCH length.

Also, the repeated transmission may be controlled by using the first available resource (resource earlier in the time direction) in order from among consecutive available symbols (consecutive available symbols). Thereby, it is possible to reduce the delay of repeated transmission.

FIG. 1 shows an example in which all symbols after symbol # 3 in slot #n can be used for data transmission (when repeated transmission is continuously arranged), but is not limited thereto. Symbols used for other signals (or channels) may be inserted between one data transmission or a plurality of data transmissions.

For example, in transmission of DL data, a symbol (U) notified as UL from a base station, a symbol (X) notified as flexible, and a control channel (for example, between consecutive symbols constituting one data transmission) , At least one of symbols used in the control resource set) may be inserted. When one symbol for other signals is inserted during DL data transmission with a data length of 4 symbols, a data transmission period is set over 5 symbols (using 4 of 5 symbols) It is good.

Further, in the transmission of UL data, a symbol (D) notified as DL from the base station, a symbol (X) notified as flexible, and control information (for example, between consecutive symbols constituting one data transmission) At least one of a symbol used for the short PUCCH and a symbol used for the reference signal (SRS) may be inserted.

In FIG. 1A, the first repetition (K = 1) data is assigned to symbols # 3- # 6 of slot #n. Note that the base station may notify the UE of information regarding the allocation start position and data length of data with K = 1. The second iteration number (K = 2) data is assigned to symbols # 7- # 10 in slot #n, and the third iteration number (K = 3) data is assigned to symbols # 11-slot # n + 1 in slot #n. The data assigned to symbol # 0 and the fourth repetition (K = 4) is assigned to symbols # 1- # 4 in slot # n + 1.

In this case, the data of the third repetition (K = 3) is arranged across the boundary between slot #n and slot # n + 1. If FIG. 1A is a DL transmission, the base station drops the DL data (or PDSCH) transmission corresponding to K = 3. If FIG. 1A is UL transmission, the UE drops the UL data (or PUSCH) transmission corresponding to K = 3. In addition, it may be controlled not to drop the data transmission of K = 3 but to actually schedule the data.

In this way, by performing control so as not to perform data transmission arranged across the slot boundary, transmission in slot units can be appropriately performed. Since the user terminal can perform transmission / reception control of each transmission in a slot, the processing load can be reduced.

Note that the order of RVs to be repeatedly assigned may be the same as when not dropping. That is, it is assumed that the RV (Redundancy Version) order set by higher layer signaling is {0, 2, 3, 1}. In this case, RV = 0 in K = 1 in FIG. 1A, RV = 2 in K = 2, and RV = 1 in K = 4. Thereby, since the order of RV can be fixed irrespective of the position of the repeated data to be dropped, the terminal processing burden can be reduced.

Alternatively, the order of RVs to be assigned repeatedly may be assigned by skipping the transmission to be dropped. That is, it is assumed that the RV order set by higher layer signaling is {0, 2, 3, 1}. In this case, RV = 0 in K = 1 in FIG. 1A, RV = 2 in K = 2, and RV = 3 in K = 4. As a result, RVs are assigned in order to each repetition regardless of the position of the repeated data to be dropped, and the performance improvement effect by repetition can be maximized.

FIG. 1A shows a configuration in which data transmission (here, K = 3) arranged across slot boundaries is not transmitted, that is, the UE is configured to reduce repeated transmission once, but this is not the only case. Absent. For example, data transmission (here, K = 3) arranged across slot boundaries may be performed after the last repeated transmission (here, K = 4). That is, data transmission arranged across slot boundaries is shifted after the last repeated transmission.

FIG. 1B shows a case where the data transmission (K = 3 in FIG. 1A) arranged across the slot boundary is shifted after the last repeated transmission (K = 4 in FIG. 1A). In this case, data of the third iteration (K = 3) is assigned to symbols # 1- # 4 in slot # n + 1, and the fourth iteration (K = 4) of symbols # 5- # 8 in slot # n + 1. Data is allocated (shifted).

In this way, by shifting the data transmission (for example, moving after the last repetitive transmission), even if there is a data transmission arranged across the slot boundary, it is repeated without reducing the number of repetitive transmissions. Transmission can be controlled.

When data transmission (here, K = 3) arranged across slot boundaries is performed after the last repeated transmission (here, K = 4), the order of RVs assigned to each repetition is shifted. You may make it common with the case where it does not. That is, it is assumed that the RV order set by higher layer signaling is {0, 2, 3, 1}. In this case, RV = 0 in K = 1 in FIG. 1B, RV = 2 in K = 2, RV = 3 in K = 3, and RV = 1 in K = 4. Thereby, since the order of RV can be fixed regardless of the number and position of the shift repetition data, the terminal processing burden can be reduced.

Alternatively, when data transmission (here, K = 3) arranged across slot boundaries is performed after the last repeated transmission (here, K = 4), the order of RVs assigned to each repetition is shifted. The transmission may be shifted with transmission. That is, it is assumed that the RV order set by higher layer signaling is {0, 2, 3, 1}. In this case, RV = 0 for K = 1 in FIG. 1A, RV = 2 for K = 2, RV = 1 for K = 3, and RV = 3 for K = 4. Thereby, it is possible to shift the transmission timing after assigning RV to each repetition, and the terminal processing can be reduced.

<Puncture / Rate matching process>
Although FIG. 1 shows an example of puncturing data transmission (K = 3 in FIG. 1A) arranged across slot boundaries, the data transmission is arranged and transmitted only in one of the slots. You may control.

In FIG. 2A, the data of the third iteration number (K = 3) scheduled to be assigned to symbol # 11 of slot # n-symbol # 0 of slot # n + 1 is transferred to only one slot (here, slot #n). The case of assignment is shown. For example, data is allocated to a slot having a larger allocation area (resource) for data among the two slots. In FIG. 2A, the data resource for the third iteration (K = 3) is 3 symbols in slot #n and 1 symbol in slot # n + 1, so slot #n is selected.

Puncture processing and / or rate matching processing may be applied to a region where data is not allocated (symbol # 0 in slot # n + 1 in FIG. 2A). When the number of data allocation resources is the same in the two slots, one of the slots (for example, a slot with a small index) may be selected.

In FIG. 2A, data of the third repetition (K = 3) is assigned to symbols # 11- # 13 of slot #n. In this case, when the resource allocation region in the frequency direction for the data is maintained (does not change), data transmission may be performed by increasing the coding rate in consideration of puncturing and / or rate matching processing. Further, when the coding rate becomes higher than a predetermined value (for example, 0.93), the transmission may be dropped.

Alternatively, when the data of the third repetition (K = 3) is allocated to symbols # 11 to # 13 of slot #n, the resource allocation area in the frequency direction for the data may be increased. Thereby, even when puncturing and / or rate matching processing is performed, data transmission can be performed while suppressing an increase in coding rate (or without increasing the coding rate).

Further, when data transmission (K = 3) arranged across the slot boundary is arranged only in the previous slot in the time direction, the allocation position of the subsequent repeated transmission (for example, after K = 4) is advanced in the time direction. (See FIG. 2B). FIG. 2B shows a case where data of K = 4 is assigned to symbols # 0 to # 3 in slot # n + 1.

Thus, the data transmission of K = 4 can be allocated following the data transmission (K = 3) allocated to the symbols # 11 to # 13 of the slot #n. As a result, it is possible to reduce delay in repeated transmission and improve resource utilization efficiency.

The receiver (user terminal in the case of downlink, base station in the case of uplink) is subjected to special processing such as an increase in coding rate and a change in resource allocation for data transmission arranged across slot boundaries, Since reception quality is different from transmission of other repetition numbers, it may be controlled not to perform reception processing. For example, in the case of FIGS. 2A and 2B, the receiver may receive / decode the repetitive transmissions other than K = 3 among the repetitively transmitted K = 1 to 4.

(Second aspect)
In the second aspect, by controlling the configuration of repeated transmission of data (or physical shared channel), it is avoided that repeated transmission is arranged across slot boundaries.

For example, when repeatedly transmitting data to which minislot-based scheduling is applied, the range for repeated transmission is limited to a predetermined slot (for example, 1 slot). When the range in which repeated transmission is performed is limited to one slot, repeated data transmission is not performed over a plurality of slots, so that data transmission across slot boundaries can be avoided.

FIG. 3 shows a case in which data transmission with a data length of 4 symbols (L = 4) is repeated twice in one slot range. The data length is not limited to 4 symbols, but may be other values (for example, 2 symbols or 7 symbols). Also, the number of data repetitions (K) is not limited to two, and may be another value.

At least one of information indicating a start symbol of data (K = 1) (for example, S = 3 indicating offset), information regarding a data length (for example, L = 4), information regarding the number of repetitions, and the like from the base station to the UE May be notified.

Also, the repeated transmission may be controlled by using the first available resource (resource earlier in the time direction) in order from among consecutive available symbols (consecutive available symbols). FIG. 3 shows a case where consecutive symbols after symbol # 3 in slot #n can be used for data transmission.

In this case, in slot #n, the number of symbols that can be used for repeated transmission is 11 (# 3- # 13). In addition, since repeated transmission is limited to the range of one slot, the number of repetitions of data transmission with a data length of 4 is 2. The base station sets the number of repetitions so that repeated transmission of data (DL data and / or UL data) within one slot range based on the data length (L), the start symbol position (S), etc. May be notified.

Further, the UE may control at least one of reception of DL data repeatedly transmitted and repeated transmission of UL transmission on the assumption that repeated transmission is not set over a plurality of slots.

As described above, by limiting the repeated transmission to the range of one slot, it is possible to avoid the repeated transmission from being arranged across the slot boundary, and to reduce the processing load of terminal control.

(Third aspect)
In the third aspect, by controlling the scheduling of data (or physical shared channel), it is avoided that repeated transmissions are arranged across slot boundaries.

For example, when data to which mini-slot base scheduling is applied is repeatedly transmitted, intra-slot repetition (intra-slot repetition) transmission and inter-slot repetition (inter-slot repetition) transmission are set. The base station may set intra-slot repetitive transmission and inter-slot repetitive transmission so that each repetitive transmission is not arranged across at least a slot boundary.

Also, when setting intra-slot repetitive transmission and inter-slot repetitive transmission, intra-slot repetitive transmission may be preferentially applied compared to inter-slot repetitive transmission. For example, when repeat transmission is set a predetermined number of times (for example, K times) for DL data (or UL data), inter-slot repetition is applied only when the number of repetitions in a slot is smaller than K.

遅 延 By repeatedly applying intra-slot repetitive transmission, it is possible to reduce repetitive transmission delay.

In addition, repeated transmission within a slot may be controlled by sequentially using resources for initial transmission (resources earlier in the time direction) that can be used for transmission among consecutive available symbols (consecutive available symbols). Good.

FIG. 4 shows an example in which repeated transmission is controlled by setting repeated transmission within a slot and repeated transmission between slots. FIG. 4 shows a case where data transmission with a data length of 4 symbols (L = 4) is repeated 4 times. Further, a case is shown where data transmission of K = 1 starts from symbol # 2 (S = 2) of slot #n. The data length is not limited to 4 symbols, but may be another value (for example, 2 symbols or 7 symbols), and the data start position is not limited to this. The number of data repetitions (K) is not limited to four, and may be another value.

<Option 1>
In option 1, the same symbol allocation is applied to repeated transmission between different slots (here, slot #n and slot # n + 1). For example, for repeated transmission within a slot, a number of times (for example, {1, 2, 4, 8}) selected from a predetermined number of candidates (for example, {1, 2, 4, 8}) The maximum number that can be placed is applied. In FIG. 4A, since the repeat transmission start position is symbol # 2 and the data length is 4 symbols, repeat transmission in one slot is set to 2.

In this case, repeated transmission is set at the same symbol position in slot #n and slot # n + 1. In FIG. 4, data of the first iteration (K = 1) is assigned to symbols # 2- # 5 in slot #n, and the second iteration (K = 2) is assigned to symbols # 6- # 9 in slot #n. Data is allocated. Similarly, data of the third iteration (K = 3) is assigned to symbols # 2- # 5 in slot # n + 1, and the fourth iteration (K = 4) of symbols # 6- # 9 in slot # n + 1. Data is allocated.

By doing this, it is possible to secure the set number of repetitions and minimize the number of slots necessary for transmission, while making the repetition arrangement in the slots common (same) among the plurality of slots. . Accordingly, the receiver can easily perform reception signal processing using repetition over a plurality of slots.

<Option 2>
In option 2, control is performed so that the start position (start symbol of each repeated transmission transmitted first in the slot) is the same in each slot (here, slot #n and slot # n + 1). To do.

In this case, repeated transmission in the slot is applied as much as possible so as not to be arranged across the slot boundary, and repeated transmission is performed over the next and subsequent slots (the same start position) when repeated transmission is not completed within one slot.

In FIG. 4B, since the repeat transmission start position is symbol # 2 and the data length is 4 symbols, repeat transmission in one slot (slot #n) is set to 3. In addition, since the number of repetitions is less than 4 in one slot, repeated transmission is performed in the next slot # n + 1. The start position of repeated transmission in the next slot # n + 1 may be the same as the start position of repeated transmission (K = 1) in slot #n.

Thus, by controlling the scheduling (number of times) of repeated transmission within a slot based on the start position and data length of repeated transmission, it is possible to flexibly control the scheduling of repeated transmission. As a result, it is possible to ensure the set number of repetitions and minimize the number of slots required for transmission, while making the start position of repeated transmission in each slot common. Processing can be simplified.

<Option 3>
In option 3, in each slot (here, slot #n and slot # n + 1), the start position where the repeated transmission is arranged (the start symbol of each repeated transmission transmitted first in the slot) is controlled separately. That is, when the first symbol is available for data transmission in a certain slot (for example, slot # n + 1), transmission is repeatedly performed from the first symbol in that slot.

Also, repeat transmission within a slot is applied as much as possible so as not to be placed across slot boundaries, and when repeated transmission is not completed within one slot, repeated transmission is performed over the next and subsequent slots.

In FIG. 4C, since the repeat transmission start position is symbol # 2 and the data length is 4 symbols, repeat transmission in one slot (slot #n) is set to 3. In addition, since the number of repetitions is less than 4 in one slot, repeated transmission is performed in the next slot # n + 1. The start position of repeated transmission in the next slot # n + 1 may be a symbol having the smallest available index.

Thus, by controlling the scheduling (number of times) of repeated transmission within a slot based on the start position and data length of repeated transmission, it is possible to flexibly control the scheduling of repeated transmission. Also, by allowing the start position to be set separately in each slot (for example, iterative transmission is started from the first available symbol), it is possible to reduce the repetition delay.

(Wireless communication system)
Hereinafter, the configuration of a wireless communication system according to an embodiment of the present invention will be described. In this wireless communication system, communication is performed using any one or a combination of the wireless communication methods according to the above embodiments of the present invention.

FIG. 5 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. In the radio communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) in which a plurality of basic frequency blocks (component carriers) each having a system bandwidth (for example, 20 MHz) of the LTE system as one unit are applied. can do.

The wireless communication system 1 includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced 4G (4th generation mobile communication system), 5G. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these.

The radio communication system 1 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. It is equipped with. Moreover, the user terminal 20 is arrange | positioned at the macrocell C1 and each small cell C2. The arrangement, the number, and the like of each cell and user terminal 20 are not limited to the mode shown in the figure.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time using CA or DC. Moreover, the user terminal 20 may apply CA or DC using a plurality of cells (CC) (for example, 5 or less CCs, 6 or more CCs).

Communication between the user terminal 20 and the radio base station 11 can be performed using a carrier having a relatively low frequency band (for example, 2 GHz) and a narrow bandwidth (also referred to as an existing carrier or a legacy carrier). On the other hand, a carrier having a relatively high frequency band (for example, 3.5 GHz, 5 GHz, etc.) and a wide bandwidth may be used between the user terminal 20 and the radio base station 12, or The same carrier may be used. The configuration of the frequency band used by each radio base station is not limited to this.

Further, the user terminal 20 can perform communication using time division duplex (TDD) and / or frequency division duplex (FDD) in each cell. In each cell (carrier), a single neurology may be applied, or a plurality of different neurology may be applied.

The wireless base station 11 and the wireless base station 12 (or between the two wireless base stations 12) are connected by wire (for example, optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface, etc.) or wirelessly. May be.

The radio base station 11 and each radio base station 12 are connected to the higher station apparatus 30 and connected to the core network 40 via the higher station apparatus 30. The upper station device 30 includes, for example, an access gateway device, a radio network controller (RNC), a mobility management entity (MME), and the like, but is not limited thereto. Each radio base station 12 may be connected to the higher station apparatus 30 via the radio base station 11.

The radio base station 11 is a radio base station having a relatively wide coverage, and may be called a macro base station, an aggregation node, an eNB (eNodeB), a transmission / reception point, or the like. The radio base station 12 is a radio base station having local coverage, and includes a small base station, a micro base station, a pico base station, a femto base station, a HeNB (Home eNodeB), an RRH (Remote Radio Head), and transmission / reception. It may be called a point. Hereinafter, when the radio base stations 11 and 12 are not distinguished, they are collectively referred to as a radio base station 10.

Each user terminal 20 is a terminal that supports various communication schemes such as LTE and LTE-A, and may include not only a mobile communication terminal (mobile station) but also a fixed communication terminal (fixed station).

In the radio communication system 1, as a radio access method, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single carrier-frequency division multiple access (SC-FDMA) is used for the uplink. Frequency Division Multiple Access) and / or OFDMA is applied.

OFDMA is a multi-carrier transmission scheme that performs communication by dividing a frequency band into a plurality of narrow frequency bands (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single carrier transmission in which the system bandwidth is divided into bands each composed of one or continuous resource blocks for each terminal, and a plurality of terminals use different bands to reduce interference between terminals. It is a method. The uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.

In the wireless communication system 1, downlink channels include a downlink shared channel (PDSCH) shared by each user terminal 20, a broadcast channel (PBCH: Physical Broadcast Channel), a downlink L1 / L2 control channel, and the like. Used. User data, higher layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. Moreover, MIB (Master Information Block) is transmitted by PBCH.

Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel), and the like. Downlink control information (DCI: Downlink Control Information) including PDSCH and / or PUSCH scheduling information is transmitted by the PDCCH.

Note that scheduling information may be notified by DCI. For example, DCI for scheduling DL data reception may be referred to as DL assignment, and DCI for scheduling UL data transmission may be referred to as UL grant.

The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to the PUSCH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel), and is used for transmission of DCI and the like in the same manner as PDCCH.

In the wireless communication system 1, as an uplink channel, an uplink shared channel (PUSCH) shared by each user terminal 20, an uplink control channel (PUCCH: Physical Uplink Control Channel), a random access channel (PRACH: Physical Random Access Channel) is used. User data, higher layer control information, etc. are transmitted by PUSCH. Also, downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR), etc. are transmitted by PUCCH. A random access preamble for establishing connection with the cell is transmitted by the PRACH.

In the wireless communication system 1, as downlink reference signals, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), and a demodulation reference signal (DMRS: DeModulation Reference Signal), Positioning Reference Signal (PRS), etc. are transmitted. In the wireless communication system 1, a measurement reference signal (SRS: Sounding Reference Signal), a demodulation reference signal (DMRS), and the like are transmitted as uplink reference signals. The DMRS may be referred to as a user terminal specific reference signal (UE-specific Reference Signal). Further, the transmitted reference signal is not limited to these.

(Radio base station)
FIG. 6 is a diagram illustrating an example of the overall configuration of a radio base station according to an embodiment of the present invention. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may each be configured to include one or more.

User data transmitted from the radio base station 10 to the user terminal 20 via the downlink is input from the higher station apparatus 30 to the baseband signal processing unit 104 via the transmission path interface 106.

In the baseband signal processing unit 104, with respect to user data, PDCP (Packet Data Convergence Protocol) layer processing, user data division / combination, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access) Control) Retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, precoding processing, and other transmission processing are performed and the transmission / reception unit 103. The downlink control signal is also subjected to transmission processing such as channel coding and inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 to a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission / reception unit 103 is amplified by the amplifier unit 102 and transmitted from the transmission / reception antenna 101. The transmission / reception unit 103 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device which is described based on common recognition in the technical field according to the present invention. In addition, the transmission / reception part 103 may be comprised as an integral transmission / reception part, and may be comprised from a transmission part and a receiving part.

On the other hand, for the upstream signal, the radio frequency signal received by the transmission / reception antenna 101 is amplified by the amplifier unit 102. The transmission / reception unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmission / reception unit 103 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 104.

The baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT: Inverse Discrete Fourier Transform) processing, and error correction on user data included in the input upstream signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed and transferred to the upper station apparatus 30 via the transmission path interface 106. The call processor 105 performs communication channel call processing (setting, release, etc.), status management of the radio base station 10, radio resource management, and the like.

The transmission path interface 106 transmits and receives signals to and from the higher station apparatus 30 via a predetermined interface. The transmission path interface 106 transmits / receives signals (backhaul signaling) to / from other radio base stations 10 via an interface between base stations (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), X2 interface). May be.

Also, the transmission / reception unit 103 repeatedly transmits a downlink physical shared channel (for example, PDSCH) with a predetermined symbol length in at least one of a period of one slot and a period of a plurality of slots. Further, the transmission / reception unit 103 receives an uplink physical shared channel (for example, PUSCH) that is repeatedly transmitted with a predetermined symbol length in at least one of a period of one slot and a period of a plurality of slots. Further, the transmission / reception unit 103 may transmit at least one piece of information on the start position of the physical shared channel (for example, K = 1), the allocated length (symbol length), and the number of repetitions.

FIG. 7 is a diagram illustrating an example of a functional configuration of a radio base station according to an embodiment of the present invention. In addition, in this example, the functional block of the characteristic part in this embodiment is mainly shown, and it may be assumed that the wireless base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. These configurations may be included in the radio base station 10, and a part or all of the configurations may not be included in the baseband signal processing unit 104.

The control unit (scheduler) 301 controls the entire radio base station 10. The control part 301 can be comprised from the controller, the control circuit, or control apparatus demonstrated based on the common recognition in the technical field which concerns on this invention.

The control unit 301 controls, for example, signal generation in the transmission signal generation unit 302, signal allocation in the mapping unit 303, and the like. The control unit 301 also controls signal reception processing in the reception signal processing unit 304, signal measurement in the measurement unit 305, and the like.

The control unit 301 schedules system information, downlink data signals (for example, signals transmitted by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resource Control). In addition, the control unit 301 controls generation of a downlink control signal, a downlink data signal, and the like based on a result of determining whether or not retransmission control is necessary for the uplink data signal. Further, the control unit 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)), downlink reference signals (for example, CRS, CSI-RS, DMRS) and the like.

In addition, the control unit 301 includes an uplink data signal (for example, a signal transmitted on PUSCH), an uplink control signal (for example, a signal transmitted on PUCCH and / or PUSCH, delivery confirmation information, etc.), a random access preamble (for example, Scheduling of the uplink reference signal and the like.

Also, the control unit 301 controls transmission so that transmission of each downlink physical shared channel to which repeated transmission is applied does not cross the slot boundary. For example, the control unit 301 may drop a transmission of a predetermined downlink physical shared channel that crosses the slot boundary.

Alternatively, when the transmission of the predetermined downlink physical shared channel crosses the boundary of the slot, the control unit 301 uses only the slot in which a large number of allocation resources for the predetermined downlink physical shared channel are arranged and uses the predetermined downlink physical shared channel. It may be controlled to perform transmission of.

Alternatively, the control unit 301 may perform control (scheduling) so that the downlink and / or uplink physical shared channel is repeatedly transmitted within the range of one slot.

Alternatively, the control unit 301 uses successive symbols that can be used for transmission of the downlink and / or uplink physical shared channel to perform control (scheduling) so as to repeatedly perform transmission in the time direction so as not to cross the slot boundary. May be. In this case, a configuration may be adopted in which intra-slot repetitive transmission and inter-slot repetitive transmission are scheduled.

The transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs it to the mapping unit 303. The transmission signal generation unit 302 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying downlink data allocation information and / or a UL grant for notifying uplink data allocation information based on an instruction from the control unit 301. The DL assignment and UL grant are both DCI and follow the DCI format. In addition, the downlink data signal is subjected to coding processing and modulation processing according to a coding rate, a modulation scheme, and the like determined based on channel state information (CSI: Channel State Information) from each user terminal 20.

The mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined radio resource based on an instruction from the control unit 301, and outputs it to the transmission / reception unit 103. The mapping unit 303 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.

The reception signal processing unit 304 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The reception signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention.

The reception signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when receiving PUCCH including HARQ-ACK, HARQ-ACK is output to control section 301. The reception signal processing unit 304 outputs the reception signal and / or the signal after reception processing to the measurement unit 305.

The measurement unit 305 performs measurement on the received signal. The measurement part 305 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.

For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurement, CSI (Channel State Information) measurement, and the like based on the received signal. The measurement unit 305 includes received power (for example, RSRP (Reference Signal Received Power)), received quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio), SNR (Signal to Noise Ratio)). Signal strength (for example, RSSI (Received Signal Strength Indicator)), propagation path information (for example, CSI), and the like may be measured. The measurement result may be output to the control unit 301.

(User terminal)
FIG. 8 is a diagram illustrating an example of the overall configuration of a user terminal according to an embodiment of the present invention. The user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may each be configured to include one or more.

The radio frequency signal received by the transmission / reception antenna 201 is amplified by the amplifier unit 202. The transmission / reception unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmission / reception unit 203 converts the frequency of the received signal into a baseband signal and outputs it to the baseband signal processing unit 204. The transmission / reception unit 203 can be configured by a transmitter / receiver, a transmission / reception circuit, or a transmission / reception device described based on common recognition in the technical field according to the present invention. The transmission / reception unit 203 may be configured as an integral transmission / reception unit, or may be configured from a transmission unit and a reception unit.

The baseband signal processing unit 204 performs FFT processing, error correction decoding, retransmission control reception processing, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. Also, broadcast information of downlink data may be transferred to the application unit 205.

On the other hand, uplink user data is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs transmission / reception units for retransmission control (for example, HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, and the like. 203. The transmission / reception unit 203 converts the baseband signal output from the baseband signal processing unit 204 into a radio frequency band and transmits it. The radio frequency signal frequency-converted by the transmission / reception unit 203 is amplified by the amplifier unit 202 and transmitted from the transmission / reception antenna 201.

Further, the transmission / reception unit 203 repeatedly transmits an uplink physical shared channel (for example, PUSCH) with a predetermined symbol length in at least one of a period of one slot and a period of a plurality of slots. Further, the transmission / reception unit 203 receives a downlink physical shared channel (for example, PDSCH) that is repeatedly transmitted with a predetermined symbol length in at least one of a period of one slot and a period of a plurality of slots. Further, the transmission / reception unit 203 may receive at least one piece of information on the start position of the physical shared channel (for example, K = 1), the allocated length (symbol length), and the number of repetitions.

FIG. 9 is a diagram illustrating an example of a functional configuration of a user terminal according to an embodiment of the present invention. In addition, in this example, the functional block of the characteristic part in this embodiment is mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. Note that these configurations may be included in the user terminal 20, and some or all of the configurations may not be included in the baseband signal processing unit 204.

The control unit 401 controls the entire user terminal 20. The control unit 401 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

The control unit 401 controls, for example, signal generation in the transmission signal generation unit 402, signal allocation in the mapping unit 403, and the like. The control unit 401 also controls signal reception processing in the reception signal processing unit 404, signal measurement in the measurement unit 405, and the like.

The control unit 401 acquires the downlink control signal and the downlink data signal transmitted from the radio base station 10 from the reception signal processing unit 404. The control unit 401 controls the generation of the uplink control signal and / or the uplink data signal based on the result of determining the necessity of retransmission control for the downlink control signal and / or the downlink data signal.

Also, the control unit 401 controls transmission so that transmission of each uplink physical shared channel to which repeated transmission is applied does not cross the slot boundary. For example, the control unit 401 may drop a transmission of a predetermined uplink physical shared channel that crosses the slot boundary.

Alternatively, when the transmission of the predetermined uplink physical shared channel crosses the boundary of the slot, the control unit 401 uses only the slot in which a large number of allocated resources for the predetermined uplink physical shared channel are arranged and uses the predetermined uplink physical shared channel. It may be controlled to perform transmission of.

Alternatively, the control unit 401 may perform control so that repeated transmission of the uplink physical shared channel is performed within the range of one slot.

Alternatively, the control unit 401 may use a continuous symbol that can be used for transmission of the uplink physical shared channel to perform control so as to repeatedly perform transmission in the time direction so as not to cross the slot boundary. In this case, a configuration may be adopted in which intra-slot repetitive transmission and inter-slot repetitive transmission are scheduled.

The transmission signal generation unit 402 generates an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) based on an instruction from the control unit 401 and outputs the uplink signal to the mapping unit 403. The transmission signal generation unit 402 can be configured by a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

The transmission signal generation unit 402 generates an uplink control signal related to delivery confirmation information, channel state information (CSI), and the like based on an instruction from the control unit 401, for example. In addition, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the UL grant is included in the downlink control signal notified from the radio base station 10.

The mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a radio resource based on an instruction from the control unit 401, and outputs the radio signal to the transmission / reception unit 203. The mapping unit 403 can be configured by a mapper, a mapping circuit, or a mapping device described based on common recognition in the technical field according to the present invention.

The reception signal processing unit 404 performs reception processing (for example, demapping, demodulation, decoding, etc.) on the reception signal input from the transmission / reception unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the radio base station 10. The reception signal processing unit 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common recognition in the technical field according to the present invention. Further, the reception signal processing unit 404 can constitute a reception unit according to the present invention.

The reception signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The reception signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to the control unit 401. In addition, the reception signal processing unit 404 outputs the reception signal and / or the signal after reception processing to the measurement unit 405.

The measurement unit 405 performs measurement on the received signal. The measurement part 405 can be comprised from the measuring device, measurement circuit, or measurement apparatus demonstrated based on common recognition in the technical field which concerns on this invention.

For example, the measurement unit 405 may perform RRM measurement, CSI measurement, and the like based on the received signal. The measurement unit 405 may measure reception power (for example, RSRP), reception quality (for example, RSRQ, SINR, SNR), signal strength (for example, RSSI), propagation path information (for example, CSI), and the like. The measurement result may be output to the control unit 401.

(Hardware configuration)
In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one device physically and / or logically coupled, or directly and / or two or more devices physically and / or logically separated. Alternatively, it may be realized indirectly by connecting (for example, using wired and / or wireless) and using these plural devices.

For example, a radio base station, a user terminal, etc. in an embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention. FIG. 10 is a diagram illustrating an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention. The wireless base station 10 and the user terminal 20 described above 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. Good.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the radio base station 10 and the user terminal 20 may be configured to include one or a plurality of each device illustrated in the figure, or may be configured not to include some devices.

For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed by one or more processors simultaneously, sequentially, or using other methods. Note that the processor 1001 may be implemented by one or more chips.

Each function in the radio base station 10 and the user terminal 20 is calculated by causing the processor 1001 to perform calculations by reading predetermined software (programs) on hardware such as the processor 1001 and the memory 1002, for example, via the communication device 1004. This is realized by controlling communication and controlling reading and / or 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, the baseband signal processing unit 104 (204) and the call processing unit 105 described above may be realized by the processor 1001.

Further, the processor 1001 reads programs (program codes), software modules, data, and the like from the storage 1003 and / or the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiments is used. For example, the control unit 401 of the user terminal 20 may be realized by a control program stored in the memory 1002 and operating in the processor 1001, and may be realized similarly for other functional blocks.

The memory 1002 is a computer-readable recording medium such as a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory), or any other suitable storage medium. It may be configured by one. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store programs (program codes), software modules, and the like that can be executed to implement the wireless communication method according to an embodiment of the present invention.

The storage 1003 is a computer-readable recording medium such as a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disk (CD-ROM (Compact Disc ROM)), a digital versatile disk, Blu-ray® disk), removable disk, hard disk drive, smart card, flash memory device (eg, card, stick, key drive), magnetic stripe, database, server, or other suitable storage medium It may be constituted by. The storage 1003 may be referred to as an auxiliary storage device.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. The communication device 1004 includes, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize frequency division duplex (FDD) and / or time division duplex (TDD). It may be configured. For example, the transmission / reception antenna 101 (201), the amplifier unit 102 (202), the transmission / reception unit 103 (203), the transmission path interface 106, and the like described above may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED (Light Emitting Diode) lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Also, the devices such as the processor 1001 and the memory 1002 are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using a different bus for each device.

The radio base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), an FPGA (Field Programmable Gate Array), and the like. It may be configured including hardware, and a part or all of each functional block may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these hardware.

(Modification)
Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal (signaling). The signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot, a pilot signal, or the like depending on an applied standard. Moreover, a component carrier (CC: Component Carrier) may be called a cell, a frequency carrier, a carrier frequency, etc.

Further, the radio frame may be configured by one or a plurality of periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may be referred to as a subframe. Further, a subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that does not depend on the neurology.

Furthermore, the slot may be configured by one or a plurality of symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.) in the time domain. Further, the slot may be a time unit based on the numerology. The slot may include a plurality of mini slots. Each minislot may be configured with one or more symbols in the time domain. The minislot may also be called a subslot.

Radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting signals. Different names may be used for the radio frame, subframe, slot, minislot, and symbol. For example, one subframe may be called a transmission time interval (TTI), a plurality of consecutive subframes may be called a TTI, and one slot or one minislot is called a TTI. May be. That is, the subframe and / or TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. There may be. Note that a unit representing TTI may be called a slot, a minislot, or the like instead of a subframe.

Here, TTI means, for example, a minimum time unit for scheduling in wireless communication. For example, in the LTE system, a radio base station performs scheduling for assigning radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. The definition of TTI is not limited to this.

The TTI may be a transmission time unit of a channel-encoded data packet (transport block), a code block, and / or a code word, or may be a processing unit such as scheduling or link adaptation. When a TTI is given, a time interval (for example, the number of symbols) in which a transport block, a code block, and / or a code word is actually mapped may be shorter than the TTI.

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

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

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

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. Further, the RB may include one or a plurality of symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource blocks. One or more RBs include physical resource blocks (PRB), sub-carrier groups (SCG), resource element groups (REG), PRB pairs, RB pairs, etc. May be called.

Further, the resource block may be configured by one or a plurality of resource elements (RE: Resource Element). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

Note that the structure of the above-described radio frame, subframe, slot, minislot, symbol, etc. is merely an example. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in the slot, the number of symbols and RBs included in the slot or minislot, and the RB The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be variously changed.

In addition, the information, parameters, and the like described in this specification may be expressed using absolute values, may be expressed using relative values from a predetermined value, or other corresponding information may be used. May be represented. For example, the radio resource may be indicated by a predetermined index.

In this specification, names used for parameters and the like are not limited names in any way. For example, various channels (PUCCH (Physical Uplink Control Channel), PDCCH (Physical Downlink Control Channel), etc.) and information elements can be identified by any suitable name, so the various channels and information elements assigned to them. The name is not limited in any way.

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

Also, information, signals, etc. can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer. Information, signals, and the like may be input / output via a plurality of network nodes.

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

The notification of information is not limited to the aspect / embodiment described in this specification, and may be performed using other methods. For example, information notification includes physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (eg, RRC (Radio Resource Control) signaling), It may be implemented by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.

The physical layer signaling may be referred to as L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signal), L1 control information (L1 control signal), or the like. Further, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup (RRCConnectionSetup) message, an RRC connection reconfiguration (RRCConnectionReconfiguration) message, or the like. The MAC signaling may be notified using, for example, a MAC control element (MAC CE (Control Element)).

In addition, notification of predetermined information (for example, notification of “being X”) is not limited to explicit notification, but implicitly (for example, by not performing notification of the predetermined information or other information) May be performed).

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

Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

Also, software, instructions, information, etc. may be transmitted / received via a transmission medium. For example, software can use websites, servers using wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) , Or other remote sources, these wired and / or wireless technologies are included within the definition of transmission media.

The terms “system” and “network” used in this specification are used interchangeably.

In this specification, “base station (BS)”, “radio base station”, “eNB”, “gNB”, “cell”, “sector”, “cell group”, “carrier” and “component” The term “carrier” may be used interchangeably. A base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.

The base station can accommodate one or a plurality of (for example, three) cells (also called sectors). If the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, an indoor small base station (RRH: The term “cell” or “sector” refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication service in this coverage. Point to.

In this specification, the terms “mobile station (MS)”, “user terminal”, “user equipment (UE)”, and “terminal” may be used interchangeably. . A base station may also be called in terms such as a fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.

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

Also, the radio base station in this specification may be read by the user terminal. For example, each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device). In this case, the user terminal 20 may have a function that the wireless base station 10 has. In addition, words such as “up” and “down” may be read as “side”. For example, the uplink channel may be read as a side channel.

Similarly, a user terminal in this specification may be read by a radio base station. In this case, the wireless base station 10 may have a function that the user terminal 20 has.

In this specification, the operation performed by the base station may be performed by the upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal may include a base station and one or more network nodes other than the base station (for example, It is obvious that this can be done by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited thereto) or a combination thereof.

Each aspect / embodiment described in this specification may be used alone, may be used in combination, or may be switched according to execution. In addition, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed as long as there is no contradiction. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

Each aspect / embodiment described in this specification includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile) communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (registered trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802 .20, UWB (Ultra-WideBand), Bluetooth (registered trademark) ), A system using another appropriate wireless communication method, and / or a next generation system extended based on these methods.

As used herein, the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

Any reference to elements using designations such as “first”, “second”, etc. as used herein does not generally limit the amount or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, reference to the first and second elements does not mean that only two elements can be employed or that the first element must precede the second element in some way.

As used herein, the term “determining” may encompass a wide variety of actions. For example, “determination” means calculating, computing, processing, deriving, investigating, looking up (eg, table, database or other data). It may be considered to “judge” (search in structure), ascertaining, etc. In addition, “determination (decision)” includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access ( accessing) (e.g., accessing data in memory), etc. may be considered to be "determining". Also, “determination” is considered to be “determination (resolving)”, “selecting”, “choosing”, “establishing”, “comparing”, etc. Also good. That is, “determination (determination)” may be regarded as “determination (determination)” of some operation.

As used herein, the terms “connected”, “coupled”, or any variation thereof, is any direct or indirect connection between two or more elements or By coupling, it can include the presence of one or more intermediate elements between two elements that are “connected” or “coupled” to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access”.

As used herein, when two elements are connected, using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples, the radio frequency domain Can be considered “connected” or “coupled” to each other, such as with electromagnetic energy having wavelengths in the microwave and / or light (both visible and invisible) regions.

In the present specification, the term “A and B are different” may mean “A and B are different from each other”. Terms such as “leave” and “coupled” may be interpreted in a similar manner.

Where the term “including”, “comprising”, and variations thereof are used in this specification or the claims, these terms are inclusive, as are the terms “comprising”. Intended to be Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modifications and changes without departing from the spirit and scope of the present invention determined based on the description of the scope of claims. Accordingly, the description herein is for illustrative purposes and does not give any limiting meaning to the present invention.

Claims (6)

1. A transmitter that repeatedly transmits a physical shared channel with a predetermined symbol length in at least one of a period of one slot and a period of a plurality of slots;
   And a control unit that controls transmission so that transmission of each physical shared channel to which repeated transmission is applied does not cross a slot boundary.
2. The transmission device according to claim 1, wherein the control unit drops transmission of a predetermined physical shared channel across a slot boundary.
3. When the transmission of the predetermined physical shared channel crosses the boundary of the slot, the control unit transmits the predetermined physical shared channel by using only the slot in which a large number of allocation resources for the predetermined physical shared channel are arranged. The transmission device according to claim 1, wherein the transmission device is controlled to perform.
4. The transmission apparatus according to claim 1, wherein the control unit performs control such that the physical shared channel is repeatedly transmitted within a range of one slot.
5. A receiving unit that receives a physical shared channel that is repeatedly transmitted with a predetermined symbol length in at least one of a period of one slot and a period of a plurality of slots;
   And a control unit that controls reception on the assumption that transmission of each physical shared channel to which repeated transmission is applied is scheduled so as not to cross a slot boundary.
6. Repeatedly transmitting a physical shared channel with a predetermined symbol length in at least one of a period of one slot and a period of a plurality of slots;
   And a step of controlling transmission so that transmission of each physical shared channel to which repeated transmission is applied does not cross a slot boundary.

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