CN111602441A - User terminal and wireless communication method - Google Patents
User terminal and wireless communication method Download PDFInfo
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- CN111602441A CN111602441A CN201880085790.4A CN201880085790A CN111602441A CN 111602441 A CN111602441 A CN 111602441A CN 201880085790 A CN201880085790 A CN 201880085790A CN 111602441 A CN111602441 A CN 111602441A
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Abstract
In order to suppress a decrease in communication throughput, communication quality, and the like even when transmission/reception of a control channel or the like is performed with a configuration different from that of a conventional LTE system, one embodiment of a user terminal according to the present disclosure includes: a receiving unit configured to receive a predetermined downlink control channel for scheduling system information; and a control unit configured to control a reception process of the predetermined downlink control channel based on the number of downlink control channel candidates defined for the predetermined downlink control channel for each subcarrier interval.
Description
Technical Field
The present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.
Background
In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) is standardized for the purpose of higher data rate, lower latency, and the like (non-patent document 1). Furthermore, for the purpose of further increasing the bandwidth and speed of LTE (also referred to as LTE rel.8 or 9), LTE-a (also referred to as LTE Advanced, LTE rel.10, 11 or 12) is standardized, and systems following LTE (also referred to as, for example, FRA (Future Radio Access)), 5G (fifth generation mobile communication system), 5G + (plus), NR (New Radio), NX (New Radio Access)), FX (New Radio Access), LTE rel.13, 14 or 15 and the like) are being studied.
In a conventional LTE system (e.g., LTE rel.8-13), communication of a Downlink (DL) and/or an Uplink (UL) is performed using a subframe of 1ms (also referred to as a Transmission Time Interval (TTI) or the like). This subframe is a transmission time unit of 1 data packet subjected to channel coding, and is a processing unit of scheduling, link adaptation, retransmission control (Hybrid automatic repeat reQuest (HARQ)), and the like.
The radio base station controls allocation (scheduling) of data to the user terminal, and notifies the user terminal of the scheduling of data by using Downlink Control Information (DCI). The user terminal monitors a downlink control channel (PDCCH) for transmitting downlink control information, performs reception processing (demodulation, decoding, and the like), and controls reception of DL data and/or transmission of uplink data based on the received downlink control information.
The transmission of the downlink Control Channel (PDCCH/EPDCCH) is controlled by aggregation (aggregation) of 1 or more Control Channel elements (CCEs (Control Channel elements))/ECCEs (Enhanced Control Channel elements)). Each control channel Element is composed of a plurality of resource Element groups (regs) (resource Element groups)/EREGs (Enhanced resource Element groups). The resource element group is also used in the case of mapping the control channel to the Resource Elements (REs).
Documents of the prior art
Non-patent document
Non-patent document 13 GPP 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
In a future wireless communication system (hereinafter, also referred to as NR), it is required to support a plurality of parameter sets (Numerology), and it is necessary to utilize a structure different from that of an existing LTE system (for example, LTE rel.13 ago). The parameter set refers to, for example, communication parameters (e.g., subcarrier spacing, bandwidth, etc.) applied to transmission and reception of a certain signal.
Therefore, in NR, it is necessary to control transmission and reception of a signal/channel (for example, a downlink control channel) different from that of the conventional LTE system, but it has not been sufficiently studied how to control transmission and reception of the downlink control channel or the like. If the UE cannot properly receive the downlink control channel or the like, there is a risk that communication throughput, communication quality, or the like deteriorates.
An object of the present disclosure is to provide a user terminal and a wireless communication method that can suppress degradation of communication throughput, communication quality, and the like even when transmission and reception of a control channel and the like are performed with a configuration different from that of a conventional LTE system.
Means for solving the problems
One aspect of the user terminal of the present disclosure is characterized by including: a receiving unit configured to receive a predetermined downlink control channel for scheduling system information; and a control unit configured to control a reception process of the predetermined downlink control channel based on the number of downlink control channel candidates defined for the predetermined downlink control channel for each subcarrier interval.
Effects of the invention
According to the present invention, even when transmission and reception of a control channel or the like are performed with a configuration different from that of the conventional LTE system, it is possible to suppress degradation of communication throughput, communication quality, and the like.
Drawings
Fig. 1 is a diagram showing an example of the maximum number of blind decodings.
Fig. 2 is a diagram showing an example of the number of candidates of the downlink control channel corresponding to each SCS according to the first aspect.
Fig. 3 is a diagram showing an example of the number of candidates of the downlink control channel corresponding to each SCS according to the second embodiment.
Fig. 4 is a diagram showing another example of the number of candidates of the downlink control channel corresponding to each SCS according to the second embodiment.
Fig. 5 is a diagram showing another example of the number of candidates of the downlink control channel corresponding to each SCS according to the second embodiment.
Fig. 6 is a diagram showing another example of the number of candidates of the downlink control channel corresponding to each SCS according to the second embodiment.
Fig. 7 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment of the present invention.
Fig. 8 is a diagram showing an example of the overall configuration of a radio base station according to an embodiment of the present invention.
Fig. 9 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment of the present invention.
Fig. 10 is a diagram showing an example of the overall configuration of a user terminal according to an embodiment of the present invention.
Fig. 11 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment of the present invention.
Fig. 12 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment of the present invention.
Detailed Description
In the conventional LTE system, the radio base station transmits Downlink Control Information (DCI) to the UE using a Downlink Control Channel (e.g., a PDCCH (Physical Downlink Control Channel), an Enhanced PDCCH (EPDCCH), or the like). Transmitting downlink control information may be interpreted as transmitting a downlink control channel.
The DCI may include at least 1 piece of scheduling information such as information specifying time/frequency resources of the scheduling data or information specifying a transport block size, information specifying a data modulation scheme, information specifying a HARQ process identifier, and information on the demodulation RS. The DCI that schedules DL data reception and/or DL reference signal measurement may be referred to as DL assignment (DL assignment) or DL grant (DL grant), and the DCI that schedules UL data transmission and/or UL Sounding (Sounding) signal transmission may be referred to as UL grant (UL grant).
The DL assignment and/or UL grant may include Information on the transmission format and the resource or sequence of a Channel for transmitting an UL Control signal (Uplink Control Information) such as HARQ-ACK feedback for DL data or Channel measurement Information (CSI). The DCI for scheduling the UL Control signal (UCI) may be defined separately from DL allocation and UL grant.
The DCI may be determined based on which value of a specific bit field (bit field) included in the DCI is used for DL assignment, UL grant, or UCI scheduling, may be determined based on which of a plurality of predetermined values the payload size (payload size) of the DCI is used for, or may be determined based on which resource region the DCI is detected in by mapping each DCI to a different resource region in advance.
The UE is configured to monitor a set of a predetermined number of downlink control channel candidates in a predetermined time unit (e.g., a subframe). Here, the monitoring means, for example, attempting to decode each downlink control channel for a DCI format to be targeted in the set. Such Decoding is also called Blind Decoding (BD), Blind detection. The downlink control channel candidates are also referred to as BD candidates, (E) PDCCH candidates, and the like.
The set of downlink control channel candidates (a plurality of downlink control channel candidates) to be monitored is also referred to as a Search Space (Search Space). The base station arranges the DCI on a predetermined downlink control channel candidate included in the search space. The UE blindly decodes 1 or more candidate resources in the search space and detects DCI for the UE. The search space may be set by a common high layer signaling between users or may be set by a user-specific high layer signaling. The search space may be set to 2 or more in the same carrier for the user terminal.
In the conventional LTE, for the purpose of link adaptation, a plurality of types of Aggregation Levels (AL) are defined in a search space. The AL corresponds to the number of Control Channel Elements (CCEs)/Enhanced Control Channel Elements (ECCEs) constituting the DCI. The search space is configured to have a plurality of downlink control channel candidates for a certain AL. Each downlink control channel candidate is composed of one or more resource elements (CCEs and/or ECCEs).
Further, as the search space, there are a common (common) search space set commonly for the UE and a UE-specific (UE-specific) search space set for each UE. In the UE-specific search space of the PDCCH of the conventional LTE, AL (CCE number) is 1, 2, 4, and 8. The BD candidate numbers are specified as 6, 2, and 2 for AL 1, 2, 4, and 8, respectively.
However, in future wireless communication systems (NR), it is required to apply a plurality of parameter sets to control communication. For example, NR is assumed to transmit and receive using a plurality of subcarrier spacings (SCS) based on frequency bands or the like. As the subcarrier spacing applied, there are 15kHz, 30kHz, 60kHz, 120kHz, 240kHz, and the like. Of course, the applicable subcarrier spacing is not limited thereto.
In NR, in order to receive predetermined system information, the UE receives Downlink Control Information (DCI) transmitted through a downlink control channel (PDCCH), and receives a downlink shared channel (PDSCH) scheduled by the DCI. The prescribed System Information is also referred to as RMSI (Remaining Minimum System Information).
Therefore, the UE monitors the downlink control channel and performs a reception process (e.g., a blind decoding process) in order to receive predetermined system information. In this reception process, it is considered that the number of candidates as PDCCH candidates monitored by the UE is fixedly set a predetermined number of times for a predetermined aggregation level. For example, the number of PDCCH candidates corresponding to aggregation level 4(AL ═ 4) is set to 4, and the number of PDCCH candidates corresponding to aggregation level 8(AL ═ 8) is set to 2.
In this way, it is considered that the number of blind decodings for the PDCCH scheduling the predetermined system information (the number of PDCCH candidates monitored by the UE) is set to a fixed value in order for the UE to receive the predetermined system information.
On the other hand, it is considered that the maximum number of blind decodings performed by the UE is set in advance in order to suppress an increase in the processing load of the UE. For example, as shown in fig. 1, it is considered that the maximum number of times of Blind Decodings (BDs) is set for each subcarrier interval applied to transmission of the PDCCH. The maximum number of times of BD shown in fig. 1 is an example, and is not limited thereto.
Cases 1-1 and 1-2 shown in fig. 1 correspond to a case where the monitoring cycle of the PDCCH is 14 symbols or more, and case 2 corresponds to a case where the monitoring cycle of the PDCCH is less than 14 symbols. Case 1-1 corresponds to a case where PDCCH is monitored from the head of the slot up to the 3 rd symbol, and case 1-2 corresponds to a case where PDCCH is monitored in any interval of 3 consecutive symbols in the slot.
In case 1-1 of fig. 1, a case where the maximum number of times of BDs of the PDCCH per slot is 44 times when the subcarrier spacing (SCS) is 15kHz is shown. In addition, the maximum frequency of the BD is 36 times when the SCS is 30kHz, the maximum frequency of the BD is 22 times when the SCS is 60kHz, and the maximum frequency of the BD is 20 times when the SCS is 120 kHz. In FIG. 1, it is considered that X is 16 or less (X.ltoreq.16) and Y is 8 or less (Y.ltoreq.8). Of course, the value of X, Y is not limited thereto.
In general, as the SCS increases, the slot length decreases, and therefore, if different SCS's are performed with the same BD number of times per 1 slot, the UE needs to perform BD processing in a shorter time when the SCS is large, and the processing load increases. Therefore, by reducing the maximum number of times of BD as the subcarrier spacing becomes larger, it is possible to suppress an increase in load of reception processing (e.g., blind decoding, etc.) of the UE.
As described above, in order for the UE to receive predetermined system information, it is considered that the number of blind decodings of the PDCCH for system information performed for each SCS is commonly set. That is, the number of blind decodings for the PDCCH used for system information is set to a common fixed value regardless of the value of the SCS.
However, in the case where the number of BDs for the PDCCH for system information is set regardless of the value of the SCS, the number of BDs for other purposes (e.g., PDCCH for other signals) is limited. For example, if the number of BDs of the PDCCH for scheduling data (PUSCH and/or PDSCH) is reduced, there is a risk that communication quality and/or throughput may be degraded.
The present invention focuses on setting the maximum number of times of different BDs for different SCS, and it is conceivable to set the number of times of BDs corresponding to a PDCCH used for system information for each SCS.
In addition, in a BD for a PDCCH used for system information, not only a predetermined AL (for example, AL of 4 or 8) but also the possibility that another AL (for example, AL of 16) is set is considered. Here, the inventors of the present invention have conceived to set the number of times of BD corresponding to the PDCCH for system information based on the number of AL set for BD corresponding to the PDCCH for system information.
Hereinafter, embodiments according to the present invention will be described in detail with reference to the drawings. The following modes may be applied individually or in combination.
In the following description, a PDCCH (PDCCH for predetermined system information) that schedules predetermined system information (RMSI) is described as an example, but the present embodiment is not limited thereto and may be applied to other PDCCHs. In addition, 15kHz, 30kHz, 60kHz, and 120kHz are given as examples of SCS, but SCS that can be applied is not limited to this.
(first mode)
In the first aspect, the number of BDs (also referred to as the number of PDCCH candidates) for a PDCCH used for predetermined system information is set independently for each SCS. Each SCS may also be used as an SCS applied to the transmission of PDCCHs.
The number of PDCCH candidates for each SCS may be set to different values or may be set to the same value. For example, the number of PDCCH candidates for different SCS may be set to different values for all the ALs for which the number of PDCCH candidates is set, may be set to different values for some of the ALs, or may be set to the same value for all the ALs.
In addition, the number of PDCCH candidates for a PDCCH to which a first SCS is applied may be set to be the same as or greater than the number of PDCCH candidates for a PDCCH to which a second SCS higher in SCS than the first SCS is applied. That is, the number of PDCCH candidates for a predetermined PDCCH is set to decrease as the SCS increases.
Thus, even when the maximum number of times of BD (the maximum number of PDCCH candidates) decreases as the SCS increases, the number of PDCCH candidates for a predetermined PDCCH can be set to be small for SCS having a small maximum number of times of BD. As a result, the number of PDCCH candidates for a predetermined PDCCH can be appropriately set according to the maximum number of times of BD corresponding to each SCS, and therefore, the number of PDCCH candidates for other PDCCHs can be secured to some extent.
Fig. 2 shows an example of a table in which the number of PDCCH candidates for a PDCCH for predetermined system information is defined for each SCS. The number of PDCCH candidates shown in fig. 2 is an example, and may be appropriately changed and applied.
Fig. 2 shows a case where the PDCCH candidate number is set for the first AL set (for example, AL is 4, 8), and a case where the PDCCH candidate number is set for the second AL set (for example, AL is 4, 8, 16). Here, the first AL set and the second AL set are distinguished as to whether or not AL is included in 16. Whether to use the first AL set or the second AL set may be determined by at least one of a value of a specific bit field included in the PBCH, a total number of resource elements included in a PDCCH resource set based on the PBCH (also referred to as CORESET, RMSI CORESET, or the like), a bandwidth (number of PRBs) of the PDCCH resource set, and a time length (number of symbols). In addition, the AL set may contain at least one AL, and is not limited to a combination of these.
Fig. 2 also shows the number of PDCCH candidates that can be used for the remaining PDCCH candidates of other PDCCHs when the number of PDCCH candidates for the predetermined PDCCH is set. The number of remaining PDCCH candidates is calculated based on the maximum number of BDs in case 1-1 of fig. 2, but is not limited thereto.
As shown in fig. 2, the PDCCH candidate number of each SCS may be individually defined for each AL set in 1 table, or different tables may be defined for each AL set.
For example, in the first AL set (no AL 16) in which the number of PDCCH candidates with AL 4 and 8 is set, the number of PDCCH candidates with AL 4 is different between the SCS 15kHz and 30kHz, while the number of PDCCH candidates with AL 8 is the same. In addition, between the SCS of 60kHz and 120kHz, the numbers of PDCCH candidates with AL of 4 and 8 are the same.
As described above, the number of PDCCH candidates for different SCS may be set to different values for all the ALs for which the number of PDCCH candidates is set, may be set to different values for some of the ALs, or may be set to the same value for all the ALs.
In addition, the number of PDCCH candidates for PDCCH to which the first SCS (for example, 15kHz) is applied may also be set to be the same as or larger than the number of PDCCH candidates for PDCCH to which the second SCS (for example, 30kHz, 60kHz, and 120kHz) having higher SCS than the first SCS is applied. The number of PDCCH candidates may be the number of PDCCH candidates in each AL, or may be the total number of PDCCH candidates in each AL included in the AL set.
As described above, by setting the number of PDCCH candidates for the predetermined PDCCH to decrease as the SCS increases, even when the maximum number of BDs is set to be small as the SCS increases, the number of PDCCH candidates for the predetermined PDCCH can be appropriately set in accordance with the maximum number of BDs for each SCS. As a result, deterioration in communication quality and/or throughput can be effectively suppressed.
In addition, when the number of PDCCH candidates is defined individually for each AL set, the number of PDCCH candidates for a predetermined PDCCH of the same SCS may be set to be different. In fig. 2, when the SCS is 15kHz, the number of PDCCH candidates corresponding to the first AL set (no AL 16) and the number of PDCCH candidates corresponding to the second AL set (AL 16) may be defined to be different from each other. In this case, all the ALs to which the PDCCH candidate number is set may be set to different values.
Further, the total value of the number of PDCCH candidates for AL included in each AL set may be set to be different. In fig. 2, when the SCS is 15kHz, the total value of the number of PDCCH candidates in the first AL set is 6(═ 4(AL ═ 4) +2(AL ═ 8)), and the total value of the number of PDCCH candidates in the second AL set is 4(═ 2(AL ═ 4) +1(AL ═ 8) +1(AL ═ 16)).
In this way, the total value of the PDCCH candidate number in the AL set including a higher AL (here, the second AL set including AL 16) may be set to be small. Generally, as AL increases, Control Channel Elements (CCEs) constituting a PDCCH (or DCI) increase, and thus a load in channel estimation or the like increases. Therefore, by reducing the total number of PDCCH candidates in the AL set including higher AL, it is possible to suppress an increase in the load of the UE.
As described above, by defining the number of PDCCH candidates (BD count) for predetermined system information independently for each SCS, PDCCH candidates can be flexibly set based on the maximum BD count corresponding to the SCS. This can suppress deterioration of communication quality and/or throughput in the predetermined SCS.
(second mode)
In the second aspect, a plurality of pieces of downlink control information (for example, DCI formats of different sizes) for scheduling predetermined system information are set, and the number of PDCCH candidates corresponding to the plurality of DCI formats is set independently for each SCS.
In the following description, a first DCI format and a second DCI format having a smaller payload size than the first DCI format are described as an example of the plurality of DCI formats, but the number of DCI formats is not limited to this. The second DCI format having a small size may also be referred to as a compact DCI format (compact DCI format).
A plurality of DCI formats (for example, a first DCI format and a second DCI format) for scheduling predetermined system information may be set to the same search space (a plurality of PDCCH candidates). In this case, the UE monitors a plurality of DCI formats in the same search space in order to receive a PDCCH for specifying system information.
The first PDCCH candidate number for the first DCI format and/or the second PDCCH candidate number for the second DCI format may be set to different values for each SCS, or may be set to the same value. For example, the first PDCCH candidate number and/or the second PDCCH candidate number for different SCS may be set to different values for all ALs for which the PDCCH candidate number is set, may be set to different values for some of the ALs, or may be set to the same value for all the ALs.
Further, the setting may be such that at least one of the first number of PDCCH candidates, the second number of PDCCH candidates, and the total of the first number of PDCCH candidates and the second number of PDCCH candidates decreases as the SCS increases. Thus, even when the maximum number of times of BD (the maximum number of PDCCH candidates) becomes smaller as the SCS becomes higher, the number of PDCCH candidates for the predetermined PDCCH can be set smaller for SCS having a smaller maximum number of times of BD.
Fig. 3 shows an example of a table in which the first PDCCH candidate number for the first DCI format and the second PDCCH candidate number for the second DCI format are defined for each SCS. The number of PDCCH candidates shown in fig. 3 is an example, and may be appropriately changed and applied.
Fig. 3 shows a case where the first PDCCH candidate number and the second PDCCH candidate number are set for the first AL set (for example, AL 4, 8), and a case where the first PDCCH candidate number and the second PDCCH candidate number are set for the second AL set (for example, AL 4, 8, 16). Here, the first AL set and the second AL set are distinguished as to whether or not AL is included in 16. In addition, the AL set may include at least one AL, and is not limited to these combinations.
For example, in the first AL set with 15kHz SCS, the number of PDCCH candidates with AL equal to 4 becomes 8(═ 4 (first PDCCH candidate number) +4 (second PDCCH candidate number)). The number of PDCCH candidates with AL equal to 8 becomes 4(═ 2 (first PDCCH candidate number) +2 (second PDCCH candidate number)).
Fig. 3 also shows the number of PDCCH candidates remaining that can be used for other PDCCHs when the first number of PDCCH candidates and the second number of PDCCH candidates are set. The number of remaining PDCCH candidates is calculated based on the maximum number of BDs in case 1-1 of fig. 1, but is not limited thereto.
As shown in fig. 3, the first PDCCH candidate number and the second PDCCH candidate number for each SCS may be defined separately for each AL set in 1 table, or different tables may be defined for each AL set.
For example, in the first AL set in which the PDCCH candidate number is set for AL 4 and 8, the first PDCCH candidate number and the second PDCCH candidate number having AL 4 have different values between the SCS of 15kHz and 30 kHz. On the other hand, the first PDCCH candidate number and the second PDCCH candidate number (2+2) having AL of 8 have the same value. In addition, between the cases where the SCS is 60kHz and 120kHz, the first PDCCH candidate number and the second PDCCH candidate number, AL being 4, 8, are the same value.
In this way, the first PDCCH candidate number and/or the second PDCCH candidate number for different SCS may be set to different values for all ALs for which the PDCCH candidate number is set, may be set to different values for some of the ALs, or may be set to the same value for all the ALs.
In addition, the number of PDCCH candidates for PDCCH to which the first SCS (for example, 15kHz) is applied may also be set to be the same as or larger than the number of PDCCH candidates for PDCCH to which the second SCS (for example, 30kHz, 60kHz, and 120kHz) having higher SCS than the first SCS is applied. The number of PDCCH candidates may be the first number of PDCCH candidates and/or the second number of PDCCH candidates in each AL, or may be the total of the first number of PDCCH candidates and/or the second number of PDCCH candidates in each AL included in the AL set.
As described above, by setting the first PDCCH candidate number and/or the second PDCCH candidate number so as to decrease as the SCS increases, even when the maximum number of BDs is set to be small as the SCS increases, the PDCCH candidate number for the predetermined PDCCH can be appropriately set in accordance with the maximum number of BDs for each SCS. As a result, deterioration in communication quality and/or throughput can be effectively suppressed.
In addition, when the number of PDCCH candidates (the first number of PDCCH candidates and the second number of PDCCH candidates) is defined individually for each AL set, the number of PDCCH candidates may be set to be different for each AL set of the same SCS. In fig. 3, when the SCS is 15kHz, the number of PDCCH candidates corresponding to the first AL set (no AL 16) and the number of PDCCH candidates corresponding to the second AL set (AL 16) may be defined to be different from each other.
Further, the total value of the first PDCCH candidate number and the second PDCCH candidate number for the AL included in each AL set may be set to be different. In fig. 3, when the SCS is 15kHz, the total value of the first PDCCH candidate number and the second PDCCH candidate number in the first AL set is 12(± 4 (first PDCCH candidate number of AL ═ 4) +4 (second PDCCH candidate number of AL ═ 4) +2 (first PDCCH candidate number of AL ═ 8) +2 (second PDCCH candidate number of AL ═ 8)). The total number of PDCCH candidates in the second AL set is 8 (the first PDCCH candidate number of 2(AL ═ 4) +2 (the second PDCCH candidate number of AL ═ 4) +1 (the first PDCCH candidate number of AL ═ 8) +1 (the second PDCCH candidate number of AL ═ 8) +1 (the first PDCCH candidate number of AL ═ 16) +1 (the second PDCCH candidate number of AL ═ 16)).
In this way, the total value of the first PDCCH candidate number and the second PDCCH candidate number in the AL set including a higher AL (here, the second AL set including AL 16) may be set to be small. Generally, as AL increases, Control Channel Elements (CCEs) constituting a PDCCH (or DCI) increase, and thus a load in channel estimation or the like increases. Therefore, by reducing the total value of the first PDCCH candidate number and the second PDCCH candidate number in the AL set including a higher AL, it is possible to suppress an increase in the load of the UE.
As described above, by defining the number of PDCCH candidates for a plurality of DCI formats used for predetermined system information independently for each SCS, it is possible to flexibly set PDCCH candidates based on the maximum number of times of BDs corresponding to SCS. This can suppress deterioration of communication quality and/or throughput in the predetermined SCS.
< modification 1 >
Fig. 3 shows a case where the number of first PDCCH candidates corresponding to the first DCI format and the number of second PDCCH candidates corresponding to the second DCI format (compact DCI format) are the same value in each AL, but the AL is not limited to this.
The number of PDCCH candidates corresponding to each of the plurality of DCI formats may be set to different values (see fig. 4). In this case, the first PDCCH candidate number may be set to be greater than the second PDCCH candidate number, or the second PDCCH candidate number may be set to be greater than the first PDCCH candidate number. Alternatively, the first PDCCH candidate number and the second PDCCH candidate number may be set to different values in a predetermined AL set and/or a predetermined AL, and the first PDCCH candidate number and the second PDCCH candidate number may be set to the same value in another AL set and/or another AL.
In this way, by allowing the number of PDCCH candidates for each DCI format to have different values, the number of PDCCH candidates can be flexibly set.
< modification 2 >
Fig. 3 shows a case where the first PDCCH candidate number corresponding to the first DCI format and the second PDCCH candidate number corresponding to the second DCI format (compact DCI format) are set for all SCS, but the present invention is not limited to this.
Only one of the first PDCCH candidate and the second PDCCH candidate may be set for a predetermined SCS (see fig. 5). Fig. 5 shows the following case: when the SCS is equal to or less than a predetermined value (for example, SCS is 15kHz and 30kHz), the first PDCCH candidate number and the second PDCCH candidate number are set, and when the SCS is greater than the predetermined value (for example, SCS is 60kHz or more), only the first PDCCH candidate number is set (the second PDCCH candidate number is not set).
In the case where the SCS is larger than the prescribed value, since the cell radius becomes relatively smaller (large cell is not required), compact DCI designed for a large cell may not be utilized. Therefore, when the SCS is larger than the predetermined value, the number of PDCCH candidates for the predetermined system information can be reduced and the number of PDCCH candidates for other PDCCHs can be secured by not setting the second number of PDCCH candidates.
In fig. 5, the first number of PDCCH candidates and the second number of PDCCH candidates set when the SCS is 30kHz or less are the same value, but may be different values.
< modification 3 >
Fig. 3 shows a case where the first PDCCH candidate number corresponding to the first DCI format and the second PDCCH candidate number corresponding to the second DCI format (compact DCI format) are set for all the ALs for which the PDCCH candidate number is set, but the present invention is not limited to this.
Only one of the first PDCCH candidate and the second PDCCH candidate may be set for a predetermined AL (see fig. 6). Fig. 6 shows the following case: when AL is equal to or less than a predetermined value (for example, AL is 4), the first PDCCH candidate number and the second PDCCH candidate number are set, and when AL is greater than the predetermined value (for example, AL is 8 or 16), only the first PDCCH candidate number is set (the second PDCCH candidate number is not set). Note that, although the predetermined value AL is 4 in this example, the predetermined value AL may be 8.
Alternatively, the following structure may be adopted: when AL is equal to or greater than a predetermined value (for example, AL is 8 or 16), the first PDCCH candidate count and the second PDCCH candidate count are set, and when AL is smaller than the predetermined value (for example, AL is 4), only the first PDCCH candidate count is set (the second PDCCH candidate count is not set). The predetermined value may be 16.
In this way, when a plurality of DCI formats are monitored in the same search space, the number of PDCCH candidates can be flexibly set by allowing the AL for which the number of PDCCH candidates for each DCI format is set to be limited. In addition, the number of candidates for the PDCCH used for the system information is suppressed from increasing, and the number of candidates for the other PDCCHs can be used.
(Wireless communication System)
Hereinafter, a configuration of a radio communication system according to an embodiment of the present invention will be described. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above-described embodiments of the present invention or a combination thereof.
Fig. 7 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment of the present invention. In the wireless communication system 1, Carrier Aggregation (CA) and/or Dual Connectivity (DC) can be applied in which a plurality of basic frequency blocks (component carriers) are integrated into one unit, the system bandwidth of the LTE system (for example, 20 MHz).
The wireless communication system 1 may be referred to as 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), and the like, and may also be referred to as a system that implements these.
The wireless communication system 1 includes: a radio base station 11 forming a macrocell C1 whose coverage area is relatively wide, and radio base stations 12(12a to 12C) arranged within the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 is arranged in the macro cell C1 and each small cell C2. The arrangement, number, and the like of each cell and user terminal 20 are not limited to the illustrated embodiments.
The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. The user terminal 20 contemplates using both macro cell C1 and small cell C2 with CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CCs) (e.g., less than 5 CCs, or more than 6 CCs).
The user terminal 20 and the radio base station 11 can communicate with each other in a relatively low frequency band (for example, 2GHz) by using a Carrier having a narrow bandwidth (also referred to as an existing Carrier, Legacy Carrier, or the like). On the other hand, a carrier having a wide bandwidth may be used between the user terminal 20 and the radio base station 12 in a relatively high frequency band (for example, 3.5GHz, 5GHz, or the like), and the same carrier as that used between the radio base station 11 may be used. The configuration of the frequency band used by each radio base station is not limited to this.
The user terminal 20 can perform communication in each cell by using Time Division Duplex (TDD) and/or Frequency Division Duplex (FDD). In addition, in each cell (carrier), a single parameter set may be applied, or a plurality of different parameter sets may be applied.
The connection between the Radio base station 11 and the Radio base station 12 (or between 2 Radio base stations 12) may be wired (for example, an optical fiber based on a CPRI (Common Public Radio Interface), an X2 Interface, or the like) or wireless.
The radio base station 11 and each radio base station 12 are connected to the upper station apparatus 30, and are connected to the core network 40 via the upper station apparatus 30. The upper station apparatus 30 includes, for example, an access gateway apparatus, 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 upper station apparatus 30 via the radio base station 11.
The radio base station 11 is a radio base station having a relatively wide coverage area, and may be referred to as a macro base station, a sink node, an enb (enodeb), a transmission/reception point, or the like. The Radio base station 12 is a Radio base station having a local coverage area, and may be referred to as a small base station, a micro base station, a pico base station, a femto base station, a HeNB (home evolved node b) (homeenodeb), an RRH (Remote Radio Head), a transmission/reception point, or the like. Hereinafter, the radio base stations 11 and 12 will be collectively referred to as a radio base station 10 without distinction.
Each user terminal 20 is a terminal supporting 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 wireless communication system 1, as a radio Access scheme, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to a downlink, and Single Carrier Frequency Division Multiple Access (SC-FDMA) and/or OFDMA is applied to an uplink.
OFDMA is a Multicarrier (Multicarrier) transmission scheme in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers) and data is mapped to each subcarrier to perform communication. SC-FDMA is a single-carrier transmission scheme that reduces interference between terminals by dividing a system bandwidth into 1 or consecutive resource blocks for each terminal and using different bands for a plurality of terminals. The uplink and downlink radio access schemes are not limited to these combinations, and other radio access schemes may be used.
In the radio communication system 1, as Downlink channels, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)), a Broadcast Channel (Physical Broadcast Channel), a Downlink L1/L2 control Channel, and the like, which are Shared by the user terminals 20, are used. User data, higher layer control Information, SIB (System Information Block), and the like are transmitted through the PDSCH. Also, MIB (Master Information Block) is transmitted through PBCH.
The 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-automatic retransmission request indicator Channel), and the like. Downlink Control Information (DCI) including scheduling Information of the PDSCH and/or the PUSCH and the like are transmitted through the PDCCH.
In addition, the scheduling information may be notified through the DCI. For example, DCI scheduling DL data reception may be referred to as DL allocation (DL assignment), and DCI scheduling UL data transmission may be referred to as UL grant (UL grant).
The number of OFDM symbols for PDCCH is transmitted through PCFICH. Transmission acknowledgement information (also referred to as retransmission control information, HARQ-ACK, ACK (acknowledgement)/NACK (negative acknowledgement), and the like) of HARQ (Hybrid Automatic Repeat reQuest) for PUSCH is transmitted by PHICH. EPDCCH and PDSCH (downlink shared data channel) are frequency division multiplexed, and are used for transmission of DCI and the like in the same manner as PDCCH.
In the radio communication system 1, as Uplink channels, an Uplink Shared Channel (PUSCH), an Uplink Control Channel (PUCCH), a Random Access Channel (PRACH), and the like, which are Shared by the user terminals 20, are used. User data, higher layer control information, etc. are transmitted through the PUSCH. In addition, downlink radio Quality information (Channel Quality Indicator (CQI)), acknowledgement information, Scheduling Request (SR), and the like are transmitted through the PUCCH. A Random Access Preamble (Random Access Preamble) for establishing a connection with a cell is transmitted through the PRACH.
In the wireless communication system 1, as downlink Reference signals, Cell-specific Reference signals (CRS), Channel state information Reference signals (CSI-RS), DeModulation Reference signals (DMRS), Positioning Reference Signals (PRS), and the like are transmitted. In addition, in the wireless communication system 1, as the uplink reference signal, a measurement reference signal (SRS: Sounding reference signal), a demodulation reference signal (DMRS), and the like are transmitted. In addition, the DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal). In addition, the transmitted reference signal is not limited thereto.
(radio base station)
Fig. 8 is a diagram showing 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 line interface 106. The number of the transmission/reception antennas 101, the amplifier unit 102, and the transmission/reception unit 103 may be 1 or more.
User data transmitted from the radio base station 10 to the user terminal 20 in downlink is input from the upper station apparatus 30 to the baseband signal processing unit 104 via the transmission line interface 106.
In baseband signal processing section 104, for user data, transmission processing such as PDCP (packet data Convergence Protocol) layer processing, division/combination of user data, RLC (Radio Link Control) layer transmission processing such as RLC retransmission Control, MAC (Medium access Control) retransmission Control (for example, HARQ transmission processing), scheduling, transport format selection, channel coding, Inverse Fast Fourier Transform (IFFT) processing, Precoding (Precoding) processing, and the like is performed, and the transmission processing is transferred to transmitting/receiving section 103. Also, the downlink control signal is subjected to transmission processing such as channel coding and inverse fast fourier transform, and transferred to transmission/reception section 103.
Transmission/reception section 103 converts the baseband signal, which is precoded and output for each antenna from baseband signal processing section 104, to a radio frequency band and transmits the signal. The radio frequency signal frequency-converted by the transmission/reception section 103 is amplified by the amplifier section 102 and transmitted by the transmission/reception antenna 101. The transmitting/receiving unit 103 can be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present invention. The transmission/reception unit 103 may be an integrated transmission/reception unit, or may be composed of a transmission unit and a reception unit.
On the other hand, for the uplink signal, the radio frequency signal received by the transmission/reception antenna 101 is amplified by the amplifier unit 102. Transmission/reception section 103 receives the uplink signal amplified by amplifier section 102. The transmitting/receiving unit 103 frequency-converts the received signal into a baseband signal and outputs the baseband signal to the baseband signal processing unit 104.
The baseband signal processing section 104 performs Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing, error correction decoding, reception processing for MAC retransmission control, and reception processing for the RLC layer and the PDCP layer on the user data included in the input uplink signal, and transfers the user data to the upper station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs call processing (setting, release, and the like) of a communication channel, state management of the radio base station 10, management of radio resources, and the like.
The transmission line interface 106 transmits and receives signals to and from the upper station apparatus 30 via a predetermined interface. The transmission line Interface 106 may transmit/receive signals (backhaul signaling) to/from other radio base stations 10 via an inter-base station Interface (e.g., an optical fiber based on a Common Public Radio Interface (CPRI), an X2 Interface).
Transmission/reception section 103 transmits a DL signal (e.g., downlink control information including a UL transmission instruction (e.g., UL grant) and/or a HARQ-ACK transmission instruction, downlink data, and the like). Transmission/reception section 103 receives a scheduled (or, allocated) UL channel after a first period from the reception of a DL signal and predetermined information (for example, PHR and/or CSI) transmitted on the UL channel.
Transmission/reception section 103 transmits a predetermined downlink control channel for scheduling system information. Further, transmission/reception section 103 transmits a predetermined downlink control channel based on the number of downlink control channel candidates defined for each subcarrier interval for the predetermined downlink control channel.
Fig. 9 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment of the present invention. Note that, in this example, functional blocks mainly representing characteristic parts in the present embodiment are shown, and it is conceivable that the radio base station 10 also has other functional blocks necessary for radio communication.
The baseband signal processing section 104 includes at least a control section (Scheduler) 301, a transmission signal generation section 302, a mapping section 303, a reception signal processing section 304, and a measurement section 305. These components may be included in the radio base station 10, or some or all of the components may not be included in the baseband signal processing section 104.
The control unit (Scheduler) 301 performs control of the entire radio base station 10. The control unit 301 may be configured by a controller, a control circuit, or a control device described based on common knowledge in the technical field of the present invention.
The control unit 301 controls, for example, generation of a signal in the transmission signal generation unit 302, allocation of a signal in the mapping unit 303, and the like. Further, the control unit 301 controls reception processing of signals in the received signal processing unit 304, measurement of signals in the measurement unit 305, and the like.
Transmission signal generating section 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, and the like) based on an instruction from control section 301 and outputs the downlink signal to mapping section 303. The transmission signal generating unit 302 can be configured by a signal generator, a signal generating circuit, or a signal generating device described based on common knowledge in the technical field of the present invention.
Transmission signal generating section 302 generates, for example, a DL assignment notifying assignment information of downlink data and/or an UL grant notifying assignment information of uplink data based on an instruction from control section 301. Both DL allocation and UL grant are DCI, according to DCI format. 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) and the like from each user terminal 20.
Received signal processing section 304 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 103. Here, the reception signal is, for example, an uplink signal (an uplink control signal, an uplink data signal, an uplink reference signal, or the like) transmitted from the user terminal 20. The received signal processing unit 304 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present invention.
The received signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, when a PUCCH including HARQ-ACK is received, the HARQ-ACK is output to control section 301. Further, the received signal processing unit 304 outputs the received signal and/or the reception-processed signal to the measurement unit 305.
The measurement unit 305 performs measurements related to the received signal. The measurement unit 305 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present 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 may measure reception Power (e.g., RSRP (Reference Signal Received Power)), reception Quality (e.g., RSRQ (Reference Signal Received Quality)), SINR (Signal to Interference plus Noise Ratio)), SNR (Signal to Noise Ratio)), Signal Strength (e.g., RSSI (Received Signal Strength Indicator)), propagation path information (e.g., CSI), and the like. The measurement result may be output to the control unit 301.
(user terminal)
Fig. 10 is a diagram showing 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. The number of the transmission/reception antenna 201, the amplifier unit 202, and the transmission/reception unit 203 may be 1 or more.
The radio frequency signal received by the transmission/reception antenna 201 is amplified by the amplifier unit 202. Transmission/reception section 203 receives the downlink signal amplified by amplifier section 202. The transmitting/receiving unit 203 frequency-converts the received signal into a baseband signal, and outputs the baseband signal to the baseband signal processing unit 204. The transmitting/receiving unit 203 can be configured by a transmitter/receiver, a transmitting/receiving circuit, or a transmitting/receiving device described based on common knowledge in the technical field of the present invention. The transmission/reception unit 203 may be an integrated transmission/reception unit, or may be composed of a transmission unit and a reception unit.
Baseband signal processing section 204 performs FFT processing, error correction decoding, reception processing of retransmission control, and the like on the input baseband signal. The downlink user data is forwarded to the application unit 205. The application section 205 performs processing and the like relating to layers higher than the physical layer and the MAC layer. Furthermore, the broadcast information may also be forwarded to the application unit 205 among the downlink data.
On the other hand, uplink user data is input from the application section 205 to the baseband signal processing section 204. Baseband signal processing section 204 performs transmission processing for retransmission control (e.g., transmission processing for HARQ), channel coding, precoding, Discrete Fourier Transform (DFT) processing, IFFT processing, and the like, and forwards the result to transmitting/receiving section 203. Transmission/reception section 203 converts the baseband signal output from baseband signal processing section 204 into a radio frequency band and transmits the converted signal. The radio frequency signal frequency-converted by the transmission/reception section 203 is amplified by the amplifier section 202 and transmitted by the transmission/reception antenna 201.
Transmission/reception section 203 receives a DL signal (e.g., downlink control information including an UL transmission instruction (e.g., UL grant) and/or an HARQ-ACK transmission instruction, downlink data, and the like). Transmission/reception section 203 transmits a UL channel scheduled (or allocated) after a first period from the reception of the DL signal, and transmits predetermined information (for example, PHR and/or CSI) using the UL channel.
Transmission/reception section 203 receives a predetermined downlink control channel for scheduling system information. Further, transmitting/receiving section 203 receives a predetermined downlink control channel based on the number of downlink control channel candidates defined for each subcarrier interval for the predetermined downlink control channel.
Fig. 11 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment of the present invention. Note that, in this example, the functional blocks mainly representing the characteristic portions in the present embodiment are shown, and it is conceivable that the user terminal 20 also has other functional blocks necessary for wireless communication.
The baseband signal processing section 204 included in the user terminal 20 includes at least a control section 401, a transmission signal generation section 402, a mapping section 403, a reception signal processing section 404, and a measurement section 405. These components may be included in the user terminal 20, or some or all of the components may not be included in the baseband signal processing section 204.
The control unit 401 controls, for example, generation of a signal in the transmission signal generation unit 402, allocation of a signal in the mapping unit 403, and the like. Further, the control unit 401 controls reception processing of signals in the reception signal processing unit 404, measurement of signals in the measurement unit 405, and the like.
The number of downlink control channel candidates set for a predetermined downlink control channel to which a first subcarrier spacing is applied is defined to be equal to or greater than the number of downlink control channel candidates set for a predetermined downlink control channel to which a second subcarrier spacing larger than the first subcarrier spacing is applied. Further, the total of the number of downlink control channel candidates set for a plurality of aggregation levels including a specific aggregation level may be defined to be smaller than the total of the number of downlink control channel candidates set for a plurality of aggregation levels not including the specific aggregation level.
Transmission signal generating section 402 generates an uplink signal (an uplink control signal, an uplink data signal, an uplink reference signal, and the like) based on an instruction from control section 401 and outputs the uplink signal to mapping section 403. Transmission signal generating section 402 can be configured by a signal generator, a signal generating circuit, or a signal generating device described based on common knowledge in the technical field of the present invention.
Transmission signal generating section 402 generates an uplink control signal related to transmission acknowledgement information, Channel State Information (CSI), and the like, for example, based on an instruction from control section 401. Transmission signal generation section 402 also generates an uplink data signal based on an instruction from control section 401. For example, when the UL grant is included in the downlink control signal notified from the radio base station 10, the transmission signal generating unit 402 instructs the control unit 401 to generate the uplink data signal.
Received signal processing section 404 performs reception processing (for example, demapping, demodulation, decoding, and the like) on the received signal input from transmission/reception section 203. Here, the reception signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, or the like) transmitted from the radio base station 10. The received signal processing section 404 can be configured by a signal processor, a signal processing circuit, or a signal processing device described based on common knowledge in the technical field of the present invention. The received signal processing section 404 can constitute a receiving section according to the present invention.
The received signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. Received signal processing section 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, and the like to control section 401. Further, the received signal processing unit 404 outputs the received signal and/or the signal after the reception processing to the measurement unit 405.
The measurement unit 405 performs measurements related to the received signal. The measurement unit 405 can be configured by a measurement instrument, a measurement circuit, or a measurement device described based on common knowledge in the technical field of the present invention.
For example, the measurement unit 405 may perform RRM measurement, CSI measurement, or the like based on the received signal. Measurement unit 405 may measure 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 be output to the control unit 401.
(hardware construction)
The block diagram used in the description of the above embodiment shows blocks in functional units. These functional blocks (constituent units) are realized by any combination of hardware and/or software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by 1 apparatus physically and/or logically combined, or may be implemented by a plurality of apparatuses by directly and/or indirectly (for example, by wire and/or wirelessly) connecting 2 or more apparatuses physically and/or logically separated.
For example, the radio base station, the user terminal, and the like according to one embodiment of the present invention may function as a computer that performs the processing of the radio communication method of the present invention. Fig. 12 is a diagram showing an example of hardware configurations of a radio base station and a user terminal according to an embodiment of the present invention. The radio 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 the following description, the expression "device" may be interpreted as a circuit, an apparatus, a unit, or the like. The hardware configurations of the radio base station 10 and the user terminal 20 may include 1 or more of each illustrated device, or may not include some of the devices.
For example, the processor 1001 is only illustrated as 1, but a plurality of processors may be provided. The processing may be executed by 1 processor, or may be executed by 1 or more processors simultaneously, sequentially, or in another manner. Further, the processor 1001 may be implemented by 1 or more chips.
Each function of the radio base station 10 and the user terminal 20 is realized by, for example, reading predetermined software (program) into hardware such as the processor 1001 and the memory 1002, and the processor 1001 performs an operation to control communication via the communication device 1004 or to control 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), the call processing unit 105, and the like can be implemented by the processor 1001.
Further, the processor 1001 reads a program (program code), a software module, data, and the like from the storage 1003 and/or 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 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 operated by the processor 1001, and may be similarly realized for other functional blocks.
The Memory 1002 may be a computer-readable recording medium including at least one of ROM (read only Memory), EPROM (erasable programmable ROM), EEPROM (electrically erasable programmable ROM), RAM (random access Memory), and other suitable storage media. 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 the embodiment of the present invention.
The storage 1003 may be a computer-readable recording medium, and may be configured by at least one of a flexible disk (flexible disc), a Floppy (registered trademark) disk, 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 (Blu-ray disc)), a removable disk (removable), a hard disk drive, a smart card (smart card), a flash memory device (e.g., a card (card), a stick (stick), a key drive (key drive)), a magnetic stripe (stripe), a database, a server, or other suitable storage medium. The storage 1003 may also be referred to as a secondary 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, for example. The communication device 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like in order to realize Frequency Division Duplexing (FDD) and/or Time Division Duplexing (TDD), for example. For example, the transmission/ reception antennas 101 and 201, the amplifier units 102 and 202, the transmission/ reception units 103 and 203, the transmission line 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, and the like) that receives 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, 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 radio base station 10 and the user terminal 20 may be configured to include hardware such as 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, and some or all of the functional blocks may be implemented by the hardware. For example, the processor 1001 may also be implemented with at least 1 of these hardware.
(modification example)
In addition, terms described in the specification and/or terms necessary for understanding the specification may be replaced with terms having the same or similar meanings. For example, the channels and/or symbols may also be signals (signaling). Further, the signal may also be a message. The reference signal may also be referred to as rs (reference signal) for short, and may also be referred to as Pilot (Pilot), Pilot signal, or the like, depending on the applied standard. Further, a Component Carrier (CC) may also be referred to as a cell, a frequency Carrier, a Carrier frequency, and the like.
The radio frame may be constituted by 1 or more periods (frames) in the time domain. Each of the 1 or more periods (frames) constituting a radio frame may also be referred to as a subframe. Further, the subframe may be formed of 1 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).
Further, the slot (slot) may be formed of 1 or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, or the like). Further, the time slot may also be a time unit based on a parameter set. In addition, a timeslot may also contain multiple mini-timeslots. Each mini-slot (minislot) may be formed of 1 or more symbols in the time domain. Further, a mini-slot may also be referred to as a subslot.
Any of a radio frame, a subframe, a slot, a mini slot (mini slot), and a symbol represents a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot and symbol may be referred to by other names corresponding to each. For example, 1 subframe may also be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may also be referred to as TTIs, and 1 slot or 1 mini-slot may also be referred to as TTIs. That is, the subframe and/or 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 smallest time unit of scheduling in wireless communication. For example, in the LTE system, the radio base station performs scheduling for allocating radio resources (frequency bandwidth, transmission power, and the like available to 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, and/or code word, or may be a processing unit such as scheduling or link adaptation. In addition, when a TTI is given, the time interval (e.g., number of symbols) to which transport blocks, code blocks, and/or codewords are actually mapped may also be shorter than the TTI.
When 1 slot or 1 mini-slot is referred to as TTI, 1 or more TTI (i.e., 1 or more slot or 1 or more mini-slot) may be the minimum time unit for scheduling. The number of slots (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 LTE Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, or the like. 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, or the like.
In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.
A Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and may include 1 or more consecutive subcarriers (subcarriers) in the frequency domain. In addition, the RB may include 1 or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of the 1 TTI and 1 subframe may be formed of 1 or more resource blocks. In addition, 1 or more RBs may also be referred to as Physical Resource Blocks (PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, and the like.
In addition, a Resource block may be composed of 1 or more Resource Elements (REs). For example, 1 RE may also be a radio resource region of 1 subcarrier and 1 symbol.
The above-described configurations of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the 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 other configurations can be variously changed.
The information, parameters, and the like described in the present specification may be expressed as absolute values, relative values to predetermined values, or other corresponding information. For example, the radio resource may be indicated by a predetermined index.
In the present specification, the names used for parameters and the like are not limitative names in all aspects. For example, various channels (PUCCH (Physical Uplink Control Channel)), PDCCH (Physical Downlink Control Channel), and the like) and information elements can be identified by any appropriate names, and thus 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 specification can be represented by 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 may be output from a higher layer (upper layer) to a lower layer (lower layer) and/or from a lower layer (lower layer) to a higher layer (upper 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 rewritten, updated, or added. 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 embodiments and modes described in the present specification, and may be performed by other methods. For example, the Information may be notified by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI), higher layer signaling (e.g., RRC (Radio resource Control) signaling), broadcast Information (Master Information Block, SIB (System Information Block, etc.), MAC (Medium Access Control) signaling), other signals, or a combination thereof.
In addition, physical Layer signaling may also be referred to as L1/L2 (Layer 1/Layer 2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may also 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. Further, the MAC signaling may be notified using, for example, a MAC Control Element (MAC CE (Control Element)).
Note that the notification of the predetermined information (for example, the notification of "yes X") is not limited to an explicit notification, and may be performed implicitly (for example, by not notifying the predetermined information or by notifying another information).
The determination may be performed based on a value (0 or 1) represented by 1 bit, may be performed based on a true or false value (boolean value) represented by true (true) or false (false), or may be performed by comparison of values (for example, comparison with a predetermined value).
Software, whether referred to as software (software), firmware (firmware), middleware (middle-ware), microcode (micro-code), hardware description language (hardware descriptive term), or by other names, should be broadly construed as meaning instructions, instruction sets, code (code), code segments (code segments), program code (program code), programs (program), subroutines (sub-program), software modules (software modules), applications (application), software applications (software application), software packages (software packages), routines (routine), subroutines (sub-routine), objects (object), executables, threads of execution, procedures, functions, and 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 wired and/or wireless technologies (e.g., coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technologies (infrared, microwave, etc.), such wired and/or wireless technologies are included within the definition of transmission medium.
The terms "system" and "network" as used in this specification are used interchangeably.
In the present specification, terms such as "Base Station (BS)", "radio Base Station", "eNB", "gNB", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station is also referred to by terms such as a fixed station (fixed station), NodeB, eNodeB (eNB), access point (access point), transmission point, reception point, femto cell, small cell, and the like.
A base station can accommodate 1 or more (e.g., 3) cells (also referred to as sectors). In the case where 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 of the smaller areas can also provide communication services through a base station subsystem (e.g., a small-sized indoor base station (RRH: Remote Radio Head)). The term "cell" or "sector" refers to a portion or the entirety of the coverage area of a base station and/or base station subsystem that is in communication service within the coverage area.
In this specification, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", and "terminal" are used interchangeably. In some cases, a base station is also referred to by terms such as a fixed station (fixed station), NodeB, eNodeB (eNB), access point (access point), transmission point, reception point, femto cell, small cell, and the like.
In some cases, those skilled in the art will also refer to a mobile station as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communications device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or several other appropriate terms.
The radio base station in this specification may be interpreted as a user terminal. For example, the aspects/embodiments of the present invention may be applied to a configuration in which communication between a wireless base station and a user terminal is replaced with communication between a plurality of user terminals (Device-to-Device (D2D)). In this case, the user terminal 20 may have the functions of the radio base station 10 described above. The expressions such as "upstream" and "downstream" can also be interpreted as "side". For example, the uplink channel can also be interpreted as a side channel (side channel).
Similarly, the user terminal in this specification can be interpreted as a radio base station. In this case, the radio base station 10 may be configured to have the functions of the user terminal 20 described above.
In this specification, the operation performed by the base station may be performed by an upper node (uplink) depending on the case. It is apparent that in a network including 1 or more network nodes (network nodes) having a base station, various operations performed for communication with a terminal may be performed by the base station, 1 or more network nodes other than the base station (considering, for example, an MME (Mobility Management Entity), an S-GW (Serving-Gateway), and the like, but not limited thereto), or a combination of these.
The embodiments and modes described in the present specification may be used alone, may be used in combination, or may be used by switching with execution. Note that, the order of the processing procedures, the sequence, the flowcharts, and the like of the embodiments and the embodiments described in the present specification may be changed as long as they are not contradictory. For example, elements of various steps are presented in the order of illustration for the method described in the present specification, but the present invention is not limited to the specific order presented.
The aspects/embodiments described in the present specification may also be applied to LTE (Long Term Evolution), LTE-a (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (fourth generation Mobile communication system), 5G (fifth generation Mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New Radio Access), FX (New Radio Access), GSM (GSM registration) (global system for Mobile communication), CDMA (Radio broadband Access 2000 (CDMA)), and so on, IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other appropriate wireless communication methods, and/or the next generation system expanded based on these.
The term "based on" used in the present specification does not mean "based only on" unless otherwise specified. In other words, the expression "based on" means both "based only on" and "based at least on".
Any reference to an element using the designations "first", "second", etc. used in this specification does not fully define the amount or order of such elements. These designations may be used herein as a convenient way to distinguish between 2 or more elements. Thus, reference to first and second elements does not imply that only 2 elements may be used or that the first element must somehow override the second element.
The term "determining" used in the present specification includes various actions in some cases. For example, "determination (determination)" may be regarded as a case where "determination (determination)" is performed for calculation (computing), processing (processing), derivation (deriving), investigation (analyzing), search (logging) (for example, search in a table, a database, or another data structure), confirmation (intercepting), 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 regarded as a case where the "determination (decision)" is performed for 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 terms "connected" and "coupled" or all variations thereof used in the present specification mean all connections or couplings between 2 or more elements directly or indirectly, and can include a case where 1 or more intermediate elements exist between 2 elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination of these. For example, "connection" may also be interpreted as "access".
In the present specification, when 2 elements are connected, it can be considered that the elements are "connected" or "coupled" to each other using 1 or more electric wires, cables, and/or printed electric connections, and using electromagnetic energy having a wavelength in a radio frequency region, a microwave region, and/or a light (both visible and invisible) region, or the like as a few non-limiting and non-inclusive examples.
In the present specification, the term "a is different from B" may mean "a is different from B". The terms "separate", "combine", and the like are also to be construed similarly.
Where the terms "comprising", "including", and variations thereof are used in the specification or claims, these terms are intended to be inclusive in a manner similar to the term "comprising". Further, the term "or" as used in the specification or claims does not mean exclusive or.
Although the present invention has been described in detail above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention defined by the claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.
Claims (6)
1. A user terminal, comprising:
a receiving unit configured to receive a predetermined downlink control channel for scheduling system information; and
and a control unit configured to control a reception process of the predetermined downlink control channel based on the number of downlink control channel candidates defined for the predetermined downlink control channel for each subcarrier interval.
2. The user terminal of claim 1,
the number of downlink control channel candidates set for a predetermined downlink control channel to which a first subcarrier spacing is applied is defined to be equal to or greater than the number of downlink control channel candidates set for a predetermined downlink control channel to which a second subcarrier spacing larger than the first subcarrier spacing is applied.
3. The user terminal of claim 1 or claim 2,
the total number of downlink control channel candidates set for a plurality of aggregation levels including a specific aggregation level is smaller than the total number of downlink control channel candidates set for a plurality of aggregation levels not including the specific aggregation level.
4. The user terminal according to any of claims 1 to 3,
the control unit controls to monitor a plurality of DCI formats for a search space set for the predetermined downlink control channel in each subcarrier interval.
5. The user terminal according to any of claims 1 to 3,
the control unit controls to monitor a plurality of DCI formats for a search space set for the predetermined downlink control channel at a subcarrier spacing that is equal to or less than a predetermined value.
6. A wireless communication method of a user terminal, comprising:
a step of receiving a predetermined downlink control channel for scheduling system information; and
and controlling a reception process of the predetermined downlink control channel based on the number of downlink control channel candidates defined for each of the predetermined downlink control channels and for each of the subcarrier intervals.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2018/000520 WO2019138510A1 (en) | 2018-01-11 | 2018-01-11 | User terminal and wireless communication method |
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| CN111602441A true CN111602441A (en) | 2020-08-28 |
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| CN201880085790.4A Pending CN111602441A (en) | 2018-01-11 | 2018-01-11 | User terminal and wireless communication method |
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| WO (1) | WO2019138510A1 (en) |
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| WO2019138510A1 (en) | 2019-07-18 |
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