Patent Description:
In the UMTS (Universal Mobile Telecommunications System) network, the specifications of long term evolution (LTE) have been drafted for the purpose of further increasing high speed data rates, providing lower latency and so on (see non-patent literature <NUM>). In addition, LTE-A (LTE advanced and LTE Rels. <NUM>, <NUM>, <NUM> and <NUM>) has been standardized for the purpose of achieving increased capacity and enhancement beyond LTE (LTE Rels. <NUM> and <NUM>).

Successor systems of LTE are also under study (for example, referred to as "FRA (Future Radio Access)," "<NUM> (5th generation mobile communication system)," "<NUM>+ (plus)," "NR (New Radio)," "NX (New radio access)," "FX (Future generation radio access)," "LTE Rel. <NUM> or <NUM> and later versions," and so forth).

In existing LTE systems (for example, LTE Rels. <NUM> to <NUM>), a user terminal (UE (User Equipment)) establishes synchronization with a network (for example, a base station (eNB: eNode B)) by detecting synchronization signals (PSS (Primary Synchronization Signal) and/or SSS (Secondary Synchronization Signal)), following initial access procedures (also referred to as "cell search," for example), and, furthermore, identifies the cells to connect to (which are identified based on, for example, cell IDs (IDentifiers)).

Also, after the cell search, the UE receives the master information block (MIB), which is transmitted in a broadcast channel (PBCH (Physical Broadcast CHannel)), system information blocks (SIBs), which are transmitted in a downlink (DL) shared channel (PDSCH (Physical Downlink Shared CHannel)), and/or others, and acquires configuration information (which may be referred to as "broadcast information," "system information," and so forth) for communicating with the network.

"<NPL>) describes agreements from RAN1#<NUM> regarding CORESET configuration for RMSI, mechanism for SI delivery including CORESET configuration information, and the authors' proposals, which are: <NUM>) NR-PBCH carries <NUM> bits indication for CORESET configuration information, limited combinations of bandwidth, duration, start timing and frequency position of CORESET that enable both TDM and FDM between SS/PBCH block and CORESET/RMSI are supported, and different combinations are supported between SS/PBCH block SCS of <NUM>/<NUM>/<NUM> and SS/PBCH block SCS of <NUM>; <NUM>) above <NUM>, NR-PBCH carries [<NUM> - <NUM>] bits indication for additional information on CORESET time/frequency location, and this additional information indicates reference SS/PBCH block time/frequency location for CORESET configuration information.

"<NPL>) describes agreements from RAN1#<NUM> and RAN2#<NUM> on NR-PBCH contents, NR-PBCH design, PBCH-DMRS design and CORESET configuration for RMSI, and the describes indication of SFN and half radio frame timing, NR-PBCH contents, NR-PBCH design and PBCH-DMRS design with the authors' proposals and observation.

See also "<NPL>), "<NPL>), "<NPL>), "<NPL>), "<NPL>), "<NPL>), "<NPL>) and "<NPL>).

Envisaging future radio communication systems (for example, NR or <NUM>), a study is underway to define a resource unit that contains synchronization signals and a broadcast channel, as a synchronization signal block, and to gain initial access based on this SS block. The synchronization signals are also referred to as "PSS and/or SSS," "NR-PSS and/or NR-SSS," and so forth. The broadcast channel is also referred to as "PBCH," "NR-PBCH," and so forth. The synchronization signal block is also referred to as an "SS block," "SS/PBCH block," and so forth.

In initial access using an SS block, for example, information about the field where a downlink control channel is provided is reported to UE by using the NR-PBCH constituting the SS block. The field where the downlink control channel (NR-PDCCH) is provided is referred to as a "control resource set (CORESET)," a "control subband," a "search space set," a "search space resource set," a "control field," a "control subband," an "NR-PDCCH field," and so on.

However, there are no fixed rules as to how the information (also referred to as "CORESET configuration," for example) related to the field to provide a downlink control channel should be placed in the NR-PBCH and reported to UE, and so an appropriate reporting method is in demand.

The present invention has been made in view of the above, and it is therefore an object of the present invention to provide a user terminal and a radio communication method, whereby information about the field where a control channel is provided can be reported adequately in a radio communication system where synchronization signal blocks are used.

According to a first aspect of the present invention, there is provided a terminal as set out in Claim <NUM>.

According to a second aspect of the present invention, there is provided a radio communication method performed by a terminal as set out in claim <NUM>.

According to a third aspect of the present invention, there is provided a system a case stationas set out in Claim9. Various embodiments are defined by the dependent claims.

According to the present invention, information about the field where a control channel is provided can be reported adequately in a radio communication system where synchronization signal blocks are used.

There is described herein a user terminal having a receiving section that receives a synchronization signal block (SS/PBCH block), which contains predetermined information representing a configuration of a control resource set, and a control section that determines a relative position of the control resource set with respect to the SS/PBCH block based on the predetermined information.

Envisaging future radio communication systems (for example, LTE Rel. <NUM> or later versions, <NUM> or NR, and so forth), a study is underway to define a signal block (also referred to as "SS/PBCH block," and so forth) that contains synchronization signals (also referred to as "SS," "PSS and/or SSS," "NR-PSS and/or NR-SSS," and so forth) and a broadcast channel (also referred to as "broadcast signal," "PBCH," "NR-PBCH," and so forth). A set of one or more signal blocks is also referred to as a "signal burst ("SS/PBCH burst" or "SS burst"). " Multiple signal blocks within a signal burst are transmitted in different beams at different times (also referred to as "beam sweep," and/or the like).

An SS/PBCH block is formed with one or more symbols (for example, OFDM symbols). To be more specific, an SS/PBCH block may be comprised of a plurality of consecutive symbols. In this SS/PBCH block, PSS, SSS and NR-PBCH may be each arranged in one or more different symbols. For example, regarding SS/PBCH blocks, a study is in progress to form an SS/PBCH block with four symbols or five symbols, including a PSS of one symbol, an SSS of one symbol, and a PBCH of two or three symbols.

A set of one or more SS/PBCH blocks may be referred to as an "SS/PBCH burst. " For example, an SS/PBCH burst may be formed with SS/PBCH blocks of consecutive frequency and/or time resources, or may be formed with SS/PBCH blocks of non-consecutive frequency and/or time resources. SS/PBCH bursts may be provided in a predetermined cycle (this cycle may be referred to as "SS/PBCH burst periodicity"), or may be provided aperiodically.

Also, one or more SS/PBCH bursts may be referred to as an "SS/PBCH burst set (SS/PBCH burst series). " SS/PBCH burst sets are provided periodically. A user terminal may control the receiving process (reception process) on assumption that SS/PBCH burst sets are transmitted periodically (in an SS/PBCH burst set periodicity (SS burst set periodicity)).

<FIG> nad 1B provide diagrams to show examples of SS burst sets. <FIG> shows an example of beam sweeping. As shown in <FIG>, a radio base station (gNB) may change the directivity of beams over time (beam sweeping), and transmit different SS blocks by using different beams. Note that, although <FIG> show examples of using multiple beams, it is also possible to transmit SS blocks by using a single beam.

As shown in <FIG>, an SS burst is formed with one or more SS blocks, and an SS burst set is formed with one or more SS bursts. For example, in <FIG>, an SS burst is formed with eight SS blocks #<NUM> to #<NUM>, but this is by no means limiting. SS blocks #<NUM> to #<NUM> may be transmitted in different beams #<NUM> to #<NUM> (<FIG>), respectively.

As shown in <FIG>, an SS burst set to include SS blocks #<NUM> to #<NUM> may be transmitted so as not to exceed a predetermined period (which is, for example, <NUM> or shorter, and also referred to as "SS burst set period," and/or the like). Also, an SS burst set may be repeated in a predetermined cycle (which is, for example, <NUM>, <NUM>, <NUM>, <NUM>, <NUM> or <NUM>, and also referred to as "SS burst set periodicity," and/or the like).

Note that, in <FIG>, predetermined time intervals are provided between SS blocks #<NUM> and #<NUM>, between SS blocks #<NUM> and #<NUM>, and between SS blocks #<NUM> and #<NUM>, but these time intervals may not be necessary, or may be provided between other SS blocks (for example, between SS blocks #<NUM> and #<NUM>, between SS blocks #<NUM> and #<NUM>, and so on). In these time intervals, for example, a DL control channel (also referred to as "PDCCH (Physical Downlink Control CHannel)," "NR-PDCCH," "downlink control information (DCI)," and so on) may be transmitted, and/or a UL control channel (PUCCH (Physical Uplink Control CHannel)) may be transmitted from a user terminal. For example, when each SS block is formed with four symbols, a slot of fourteen symbols may contain an NR-PDCCH of two symbols, two SS blocks, an NR-PUCCH of two symbols, and a guard time.

Also, the index of each SS block is indicated using the NR-PBCH (or DMRS for NR-PBCH) contained in the SS block. The UE can identify the index of each SS block that is received, based on the NR-PBCH (or the DMRS for the NR-PBCH).

Also, a study is in progress to allow a base station to indicate, to UE, information about the field where a downlink control channel (NR-PDCCH) is provided, by using the NR-PBCH. The information about the field where the NR-PDCCH is provided may be referred to as "control resource set configurations (CORESET configurations)," "NR-PDCCH configurations," and so forth.

In addition, research is underway to allow a base station to schedule system information (for example, RMSI (Remaining Minimum System Information)) by using the NR-PDCCH. In this case, based on the control resource set configurations indicated in the NR-PBCH, the UE receives the NR-PDCCH, and, by receiving the NR-PDSCH that is scheduled by this NR-PDCCH, acquires system information.

Meanwhile, what content is included and indicated in the NR-PBCH is not specifically fixed, and the problem has to do with how to configure and indicate the specifics of the method of indicating control resource set configurations (such as the number of bits, content, and so on) to the UE.

Resources that can be applied to NR-PBCH are limited, so that, with the NR-PBCH, it is desirable to reduce the payload to the minimum necessary, improve the rate of detection by increasing the redundancy, and, furthermore, reduce the range and/or the granularity in which NR-PDCCH configurations are provided. In particular, when the frequency band is low (for example, lower than <NUM>), the number of beams to use is smaller than when the frequency band is high, so that it is desirable to fulfill the above conditions.

Also, considering that multiple beams are used in a high frequency band (for example, <NUM> or above), it is desirable to provide NR-PDCCH configurations in a wide range and/or with fine granularity. For example, it is possible to configure a common set of control resources using NR-PBCHs of different frequency bands and/or different transmission timings.

In this way, when indicating control resource set configurations using NR-PBCHs contained in SS/PBCH blocks, it is desirable to exert control so that at least one of the following conditions is fulfilled:.

The contents (parameters) of control resource set configurations to be indicated using the NR-PBCH include the bandwidth (BW), the duration (for example, the number of symbols), the start timing and the frequency position of the control resource set. At least one item of these contents is indicated using the bit information that is included in the NR-PBCH.

When indicating some or all of the bandwidth, the duration, the start timing and the frequency position of a control resource set, it may be possible to define a table, in which the bit information to be included in the NR-PBCH and the contents of control resource set configurations are associated with one another. Based on the bit information included in the NR-PBCH and the table provided in advance, the UE can identify the control resource set configurations and receive the downlink control channel that is transmitted in the control resource set.

In contrast to the present invention, it may have been possible to define one table, in which control resource set configurations, corresponding to pieces of bit information to be included in the NR-PBCH, are laid out. In this case, regardless of what frequency band (and optionally subcarrier spacing SCS) is used to transmit SS blocks, control resource set configurations can be indicated, in predetermined bits, by using one common table.

However, in future radio communication systems, SS burst sets may be arranged differently depending on what subcarrier spacing (SCS) is used to transmit SS/PBCH blocks.

Referring to <FIG> and <FIG>, the SS burst set composition to be applied to each subcarrier spacing (here, SCS=<NUM>, <NUM>, <NUM>, <NUM>, etc.) will be described.

<FIG> shows an example of the SS burst set composition for use when the subcarrier spacing is <NUM>. In this case, two SS blocks (here, SSB #<NUM> and SSB #<NUM>) are allocated in one slot (for example, <NUM>). In the composition shown in <FIG>, for example, the frequency band used is <NUM> to <NUM>, and the number of candidate SS block positions in an SS burst set is configured to four. Alternatively, the frequency band used is <NUM> to <NUM>, and the number of candidate SS block positions in an SS burst set is configured to eight. The frequency band that can be used and the number of candidate SS block positions are not limited to these.

<FIG> show examples of SS burst set compositions for use when the subcarrier spacing is <NUM>. In this case, two SS blocks (here, SSB #<NUM> and SSB #<NUM> or SSB #<NUM> and SSB #<NUM>) are allocated in one slot (for example, <NUM>). Note that, in one slot, SS blocks may be arranged consecutively (see <FIG>) or non-consecutively (see <FIG>). In the compositions shown in <FIG>, for example, the frequency band used is <NUM> to <NUM>, and the number of candidate SS block positions in an SS burst set is configured to four. Alternatively, the frequency band used is <NUM> to <NUM>, and the number of candidate SS block positions in an SS burst set is configured to eight. The frequency band that can be used and the number of candidate SS block positions are not limited to these.

<FIG> show an example of the SS burst set composition for use when the subcarrier spacing is <NUM>. In this case, two SS blocks (here, SSB #<NUM> and SSB #<NUM>, or SSB #<NUM> and SSB #<NUM>) are allocated in one slot (for example, <NUM>). In the composition shown in <FIG>, for example, the frequency band used is <NUM> to <NUM>, and the number of candidate SS block positions in an SS burst set is configured to <NUM>. The frequency band that can be used and the number of candidate SS block positions are not limited to these.

<FIG> shows an example of the SS burst set composition for use when the subcarrier spacing is <NUM>. In this case, four consecutive SS blocks (here, SSB #<NUM> to #<NUM>, or SSB #<NUM> #<NUM>) are allocated in one slot (for example, <NUM> (<NUM> OFDM symbols)). In the composition shown in <FIG>, for example, the frequency band used is <NUM> to <NUM>, and the number of candidate SS block positions in an SS burst set is configured to <NUM>. The frequency band that can be used and the number of candidate SS block positions are not limited to these.

Thus, even when SS blocks are transmitted by using multiple subcarrier spacings, the SS burst set composition changes only when the subcarrier spacing is <NUM>. To be more specific, in the event the subcarrier spacing is <NUM>, <NUM>, <NUM> and so on, one slot contains two SS blocks, and no composition is used in which at least three or more consecutive SS blocks are arranged. By contrast with this, when the subcarrier spacing is <NUM>, a composition is used in which four consecutive SS blocks are arranged.

Therefore, if the above-mentioned table is defined based on burst sets that are for use when the SCS is <NUM>, <NUM>, <NUM> and so on, it is difficult to apply this table to the SCS of <NUM> on an as-is basis. For example, when a composition in which control resource sets are arranged in fields that are adjacent to SS blocks (for example, in the same frequency position) is defined in the table, there is a possibility that control resource sets or SS blocks and control resource sets collide with each other when the SCS is <NUM> and four SS blocks continue. Meanwhile, if a common table is designed by taking into the account burst sets for all SCSs, control resource set configurations may not be configured flexibly.

Also, when indicating positions pertaining to a control resource set (for example, the start position), it may be possible to indicate specific symbols (for example, the symbol that is one symbol before an SS block). For example, it may be possible to define specific symbols, in advance, in a table corresponding to a predetermined number of bits, and indicate these symbols to the UE. However, when indicating the positions of control resource sets in this way by using a limited number of bits, it is difficult to indicate control resource set positions in a flexible way.

So, the present inventors have come up with the idea of configuring a number of variations (options) for positioning OFDM symbols for indicating control resource sets, depending on the positions of SS blocks. For example, based on multiple options (information to point forward in the time direction with respect to an SS block, information to point backward in the time direction, or other information), the positions of OFDM symbols in a control resource set are indicated by using the amounts of time shift based on relative positions with respect to the SS block. By this means, even when the NR-PBCH payload is limited, arrangement of control resource sets can be controlled in a flexible way.

When explicitly indicated, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Note that the configurations according to each embodiment may be applied individually or may be applied in combination. Furthermore, although cases will be illustrated with the following description where an SS block is formed with four symbols (an NR-PSS, an NR-SSS and two NR-PBCHs), the configuration of SS blocks is by no means limited to this.

Herein is further described that different control resource set configurations are indicated, per SS block (NR-PBCH), depending on what subcarrier spacing (SCS) is used to transmit SS blocks. A case will be described below where a common control resource set configuration is used when the SCS is <NUM>, <NUM>, <NUM> and <NUM>, and a different control resource set configuration is used for <NUM>. However, the grouping of SCSs to use a common control resource set configuration is not limited to this combination.

For example, a common table (first table) may be defined, in which the bit information to be indicated in SS blocks where the SCS used is <NUM>, <NUM>, <NUM> and <NUM> (first SCS), and the control resource set configurations corresponding to the bit information are set forth. Meanwhile, a table (second table), in which the bit information to be indicated in SS blocks where the SCS used is <NUM> (second SCS), and the control resource set configurations corresponding to the bit information are set forth, is configured apart from the first table.

To be more specific, the number of bits and/or the content that are used to indicate a control resource set configuration is configured differently when the first SCS is used and when the second SCS is used. Now, a case of using different numbers of bits to indicate control resource set configurations for the first SCS and the second SCS (configuration <NUM>), and a case of indicating different contents by using a common number of bits (configuration <NUM>) will be described below.

For example, in an SS block where the first SCS is used, the control resource set configuration is indicated using four bits of bit information, whereas, in an SS block where the second SCS is used, the control resource set configuration is indicated using five bits of bit information. Note that it is only necessary to apply a large number of bits to the second SCS, at least compared to the first SCS, and the number of bits is not limited to these examples. By this means, when the second SCS is used, it is possible to indicate more control resource set configurations than when the first SCS is used, so that enough options can be reserved for a given SCS.

<FIG> shows an example of the first table in the event control resource set configurations are indicated using four bits of bit information. Here, a case is illustrated in which the bandwidth (BW), the duration (for example, the number of symbols), the start timing and the frequency position are set forth in the table as control resource set configurations.

In <FIG>, the bandwidth of control resource sets is defined to be <NUM> PRBs, <NUM> PRBs or <NUM> PRBs. In addition, the duration of control resource sets is defined to be one to three symbols. The start position of control resource sets is defined to be one of S1 to S3. The frequency position of control resource sets is defined to be one of F1 to F3.

Control resource set start positions S1 to S3 may be configured as follows (see <FIG>):.

Control resource set start positions F1 to F3 may be configured as follows (see <FIG>):.

Note that the contents to be set forth in the table (parameters, numerical values, etc.) are not limited to these.

<FIG> shows an example of the second table in the event control resource set configurations are indicated using five bits of bit information. Here, a case is illustrated in which the bandwidth (BW), the duration (for example, the number of symbols), the start timing and the frequency position are set forth in the table as control resource set configurations.

In <FIG>, the bandwidth of control resource sets is defined to be <NUM> PRBs, <NUM> PRBs or <NUM> PRBs. In addition, the duration of control resource sets is defined to be one to three symbols. The start position of control resource sets is defined to be one of S1 to S3, and, in addition, S8, S9, S10, S11, S12 and S14. The frequency position of control resource sets is defined to be one of F1 to F3.

S8 to S14 each represent the number of OFDM symbols before the SS block. That is, "S8" indicates that the OFDM symbol that is located eight OFDM symbols before the SS block is the start position. Similarly, "S9" indicates that the OFDM symbol that is located nine OFDM symbols before the SS block is the start position.

In table <NUM>, control resource set configurations are set forth in association with more bit information than in table <NUM>. Referring to <FIG>, control resource set start positions are defined in a larger number of patterns in table <NUM> than in table <NUM>. Start positions are thus provided in greater detail, so that, even when four SS blocks continue, it is possible to configure the positions (for example, the start positions) of control resource sets, indicated in respective SS blocks, in a flexible way.

In this way, compared to the control resource set configurations for the first SCS, at least a large number of variations (patterns) of start positions are configured in control resource set configurations for the second SCS. Note that, as for other parameters (bandwidth, duration, frequency position, etc.), too, different contents (such as numerical values) may be set forth for the control resource set configurations for the first SCS and the control resource set configurations for the second SCS.

For example, in SS blocks in which the first SCS is used and SS blocks in which the second SCS is used, different control resource set configurations may be indicated using four bits of bit information in each.

<FIG> shows an example of the second table (used in second SCS transmission) in the event control resource set configurations are indicated using four bits of bit information. Here, a case is illustrated in which the bandwidth (BW), the duration (for example, the number of symbols), the start timing and the frequency position are set forth in the table as control resource set configurations. Note that the first table used in first SCS transmission holds the same contents as in <FIG>.

In <FIG>, the bandwidth of control resource sets is defined to be <NUM> PRBs, <NUM> PRBs or <NUM> PRBs. In addition, the duration of control resource sets is defined to be one to three symbols. The start position of control resource sets is defined to be one of S1 to S3, S8, S9, and S10. The frequency position of control resource sets is defined to be one of F1 to F3.

Control resource set start positions S1 to S3 or S8 to S10 may be configured as follows:.

In this manner, when the first table and the second table are defined in association with the same bit information (for example, four bits), the start positons of SS blocks are defined in the second table in many variations (patterns). By this means, even when different SS burst sets (for example, different numbers of consecutive SS blocks) are configured between the first SCS and the second SCS, it is still possible to apply control resource set configurations, in a flexible manner, so as to suit each SS burst set.

Note that, although <FIG> shows a case where the number of symbols of SS blocks is specifically defined as the start position of control resource sets, this is by no means limiting. For example, the start position of a control resource set that is indicated in an SS block may be determined based on the SS block's index (see <FIG>). Note that, in the event the table shown in <FIG> is used as the second table, the first table may have the same contents as in <FIG>.

In <FIG>, the start position of control resource sets is defined to be one of S1, S3 and SZ. Here, SZ represents the OFDM symbol that is located Z OFDM symbols before the SS block, and Z is a value related to the SS block index. For example, Z may be a value that is determined from following equation <NUM>, for example. Note that the modulo operation used in equation <NUM> below depends on the number of SS blocks that are continuous in a slot (here, four SS blocks), and can be changed as appropriate based on the SS burst set composition (for example, consecutive SS block configuration).

In this way, by using a configuration to calculate the start position of control resources from the SS block index, it is possible to reduce the number of patterns of start positions to define in the second table (the number of variations of start positions defined). This makes it possible to reduce the bit values of bit information that is indicated in SS blocks transmitted by applying the second SCS (for example, the same bit values as when the first SCS is used), and, furthermore, control the start positions in a flexible way. Note that the first table may be defined for the first SCS too, so that the start positions can be calculated based on SS block indices.

In an embodiment described henceforth a plurality of variations (options) of OFDM symbol positions for indicating control resource sets are configured depending on the positions of SS blocks, and indicated from a base station to UE. It is possible to add the options as presented between paragraphs <NUM> and <NUM> to this embodiment.

To indicate the start position of a control resource set based on the amount of time shift with respect to the SS block, not only a field that is located ahead of the SS block in the time direction, but also a field that is located behind the SS block, and/or a field that is located elsewhere (for example, a field in the SS block), may be indicated.

That is, multiple options for indicating positions (that is, for at least a part of a plurality of start position candidates of the control resource set indicated by the information, symbol positions) pertaining to control resource sets are configured depending on where the SS block is positioned, and the positions of control resource sets, which schedule RMSI, are configured and indicated flexibly.

Now, a case will be described below where the position of an OFDM symbol in a control resource set is indicated by using the amount of time shift based on the relative position with respect to the SS block, by configuring multiple options.

In the following description, a specific symbol in the SS block, a symbol located ahead of the SS block, and a symbol located behind the SS block will be configured as multiple options for use when indicating the position of an OFDM symbol in a control resource set. Note that a symbol located ahead of an SS block and a symbols located behind an SS block indicate positions in the time direction with respect to an SS block. Obviously, the multiple options that can be used when indicating the position of an OFDM symbol in a control resource set are not limited to these.

For example, one of following SX, SY and S3 is indicated, from a base station to UE, as the start position of a control resource set. Obviously, the contents and variations to be indicated to the UE are not limited to these:.

X and Y each correspond to the amount of shift with respect to the SS block, and may have values determined based on predetermined parameters. For example, X and/or Y may be values determined by at least one of the subcarrier spacing, the configuration of the control resource set, the configuration of the SS block, and the frequency band.

For example, X and/or Y may be determined per subcarrier spacing that is used to transmit an SS block (or per configuration in which SS blocks continue). In this case, an equation to include the configuration of the control resource set (for example, the duration of the control resource set) and the configuration of the SS block (for example, the SS block index) may be defined for each subcarrier spacing.

For example, in subcarrier spacings (for example, the SCS of <NUM> (for example, <FIG>), <NUM> (for example, <FIG>)) and so on, at which configurations with non-consecutive SS blocks are used, X and Y may be calculated from equation <NUM> and equation <NUM> below (see <FIG>). Note that <FIG> show the case where the duration of the control resource set is <NUM>. <MAT> <MAT>.

<FIG> shows a case where X=<NUM> and Y=<NUM>. For example, if the UE receives SS block #<NUM> and X or Y is indicated in the NR-PBCH contained in this SS block #<NUM>, the UE identifies the relative position from SS block #<NUM> based on equation <NUM> or <NUM> above. Then, the receipt of RMSI is controlled on assumption that the control resource set is transmitted in that relative position with respect to SS block #<NUM>. When the UE receives another SS block #<NUM>, the same process might take place.

In this way, information that can point forward or backward with respect to an SS block is included in the SS block and indicated to UE as the amount of shift from the SS block, so that it is possible to control the positions of control resource sets in a flexible way.

Furthermore, in subcarrier spacing (for example, the SCS of <NUM> (<FIG>), <NUM> (<FIG>)), at which configurations with two consecutive SS blocks are used, X and Y may be calculated from following equations <NUM> and <NUM> (see <FIG>): <MAT> <MAT>.

<FIG> shows a case where two consecutive SS blocks are provided, and where X=<NUM> and Y=<NUM> hold in the first SS block, and X=<NUM> and Y=<NUM> hold in the second SS block. For example, if the UE receives SS block #<NUM> and X or Y is indicated in the NR-PBCH contained in SS block #<NUM>, the UE identifies the relative position from SS block #<NUM> based on equation <NUM> or <NUM> above. Then, the receiption of RMSI is controlled on assumption that the control resource set is transmitted in that relative position with respect to this SS block #<NUM>. When the UE receives other SS blocks #<NUM> to #<NUM>, the same process might take place.

In this way, information that can point forward or backward with respect to an SS block is included in the SS block and indicated to UE as the amount of shift from the SS block, so that it is possible to control the positions of control resource sets in a flexible way. Also, even when SS blocks continue, it is possible to arrange control resource sets adequately by determining the positions of control resource sets by taking into account the SS block indices and the duration of control resource sets.

Also, in subcarrier spacing (for example, the SCS of <NUM> (<FIG>)) to use four consecutive SS blocks, X and Y may be calculated from equation <NUM> and equation <NUM> below (see <FIG>): <MAT> <MAT>.

In <FIG>, the first SS block of the four consecutive SS blocks represents the case of X=<NUM> and Y=<NUM>, the second SS block represents the case of X=<NUM> and Y=<NUM>, the third SS block represents the case of X=<NUM> and Y=<NUM>, and the fourth SS block represents the case of X=<NUM> and Y=<NUM>. For example, if the UE receives SS block #<NUM> and X or Y is indicated in the NR-PBCH contained in SS block #<NUM>, the UE identifies the relative position from SS block #<NUM> based on equation <NUM> or <NUM> above. Then, the receiption of RMSI is controlled on assumption that the control resource set is transmitted in that relative position with respect to SS block #<NUM>. When the UE receives other SS blocks #<NUM> to #<NUM>, the same process might take place.

In this way, even when SS blocks continue, the position of the control resource set is determined by looking at the SS block index and the duration of the control resource set, so that control resource sets can be arranged adequately.

Note that equations <NUM> to <NUM> for determining X and Y are not limited to the above settings. X and Y may be determined based on other numerical values or parameters.

Also, SX, SY and S3 may be all configured as start positions in the above-described tables (for example, <FIG>), or information of SX, SY or S3 may be indicated to UE without using a table. Also, only SX and SY may be configured in a table, or only SY and S3 may be configured in a table. Note that, instead of S3 (or in addition to S3), information to represent other positions (S2, for example) may be configured in a table.

In this way, positions pertaining to control resource sets are indicated by using multiple options (information to point forward in the time direction with respect to an SS block, information to point backward in the time direction, or other information), so that, even when the NR-PBCH payload is limited, the arrangement of control resource sets can be controlled in a flexible way.

A third aspect of the present invention is configured so that different control resource set configurations are indicated in each SS block (NR-PBCH) depending on what frequency band is used to transmit that SS block. A case will be illustrated with the following description where different control resource set configurations (for example, different tables) are used for bands lower than <NUM> (first band) and for bands equal to or higher than <NUM> (second band).

For example, the number of bits and/or contents used to indicate control resource set configurations may be configured to vary between the first band and the second band. Now, a case will be described below where different numbers of bits are used to indicate the control resource set configurations for the first band and for the second band.

For example, in an SS block where the first band is used, control resource set configuration is indicated using four bits of bit information, and, in an SS block where the second band is used, the control resource set configuration is indicated using twelve bits of bit information. Note that it is only necessary to apply a large number of bits to the second band, at least compared to the first band, and the number of bits is not limited to these.

<FIG> nad 9B and <FIG> show examples of tables (third table) for use for indicating control resource configurations in the second band. Note that the third table represents the case in which control resource set configurations are indicated using twelve bits of bit information. Note that the table described earlier with respect to the first aspect (for example, <FIG>) can be used as the table for indicating control resource configurations in the first band.

<FIG> shows a table in which the bandwidths and durations of control resource sets are defined using three bits. In addition, <FIG> shows a table in which the start positions of control resource sets are defined using four bits. In addition, <FIG> shows a table in which the start positions of control resource sets are defined using five bits.

In <FIG>, the bandwidth of control resource sets is defined to be <NUM> PRBs, <NUM> PRBs, <NUM> PRBs or <NUM> PRBs. In addition, the duration of control resource sets is defined to be one to three symbols. In <FIG>, the start position of control resource sets is defined to be one of SB <NUM>, SB <NUM>, SB <NUM>, SB <NUM>, SB <NUM>, SB <NUM>, SB <NUM>, ST <NUM>, ST <NUM>, SN <NUM>, SA <NUM>, SA <NUM>, SA <NUM>, SA <NUM>, SA <NUM> and SA <NUM>.

To represent the start position of a control resource set, SBX is the OFDM symbol that is located X OFDM symbols before the SS block. For example, SB <NUM> points to the OFDM symbol that is located two OFDM symbols before the SS block. STX points to the X-th OFDM symbol in the SS block. For example, ST <NUM> points to the first OFDM symbol in the SS block. SN <NUM> points to the next OFDM symbol after the SS block. SAX is the X-th OFDM symbol after the SS block. For example, SA <NUM> points to the second OFDM symbol after the SS block.

As for the start positions of control resource sets, the configuration described in the second aspect may be applied.

In <FIG>, either the same center frequency (F) as that of the SS block or the offset value (the number of PRBs) from this center frequency (F) of the SS block is defined as the frequency position of the control resource set. Predetermined numbers of PRBs (for example, +<NUM>, +<NUM>, +<NUM>. , +<NUM>, -<NUM>, -<NUM>, - <NUM>,. , -<NUM>) may be configured as offset values.

In this way, the offset from the frequency position (the center frequency) of each SS block is indicated to the UE as the frequency position of the control resource set indicated in that SS block, so that it is possible to control the frequency positions of control resource sets in a flexible way. By this means, it is possible to indicate common control resource sets from different SS blocks.

In this way, the number of patterns of control resource set configurations to indicate in each SS block is changed based on the frequency band, so that it is possible to control the configurations of control resource sets in a flexible way, depending on the communicating environment. For example, when applying the second band (such as high frequency band), a configuration may be used that can indicate more control resource set configurations than when the first band is used. This enables flexible operation, such as indicating common control resource set configurations from different NR-PBCHs, in a high frequency band where multi-beam operation is applied.

In case the options presented in paragraphs <NUM> to <NUM> are used, in the event a given bandwidth (for example, <NUM> or above) is in use, the frequency position (for example, the frequency offset) of control resource sets is indicated to the UE.

For example, when the first SCS is used, the first table (see, for example, <FIG>) and bit information to correspond to the first table may be used, and, when the second SCS is used, the second table (see, for example, <FIG>, <FIG> or <FIG>) and bit information to correspond to the second table may be used. Also, when, in each SCS, an SS block is transmitted using a predetermined bandwidth (for example, <NUM> or above), bit information (see, for example, <FIG>) to indicate the frequency position (for example, the frequency offset) of the control resource set may be additionally indicated to UE.

By this means, the configurations of control resource sets can be controlled flexibly, taking into account the SCS and the frequency band that are used to transmit SS blocks.

Note that the tables described with the present embodiment, in which control resource set configurations are set forth, may be defined in advance in the specification, or may be configured from a base station to UE by using downlink control information and/or higher layer signaling (for example, RRC signaling and/or broadcast information).

Now, the structure of the radio communication system according to one embodiment of the present invention will be described below. In this radio communication system, communication is performed using one or a combination of the herein-contained embodiments of the present invention.

<FIG> is a diagram to show an example of a schematic structure of a radio communication system according to one embodiment of the present invention. A radio communication system <NUM> can adopt carrier aggregation (CA) and/or dual connectivity (DC) to group a plurality of fundamental frequency blocks (component carriers) into one, where the LTE system bandwidth (for example, <NUM>) constitutes one unit.

Note that the radio communication system <NUM> may be referred to as "LTE (Long Term Evolution)," "LTE-A (LTE-Advanced)," "LTE-B (LTE-Beyond)," "SUPER <NUM>, "IMT-Advanced," "<NUM> (4th generation mobile communication system)," "<NUM> (5th generation mobile communication system)," "FRA (Future Radio Access)," "New-RAT (Radio Access Technology)" and so on, or may be seen as a system to implement these.

The radio communication system <NUM> includes a radio base station <NUM> that forms a macro cell C1 of a relatively wide coverage, and radio base stations <NUM> (12a to 12c) that are placed within the macro cell C1 and form small cells C2, which are narrower than the macro cell C1. Also, user terminals <NUM> are placed in the macro cell C1 and in each small cell C2.

The user terminals <NUM> can connect with both the radio base station <NUM> and the radio base stations <NUM>. The user terminals <NUM> may use the macro cell C1 and the small cells C2 at the same time by means of CA or DC. Furthermore, the user terminals <NUM> may apply CA or DC across a plurality of cells (CCs) (for example, five or fewer CCs or six or more CCs). For example, in DC, MeNB (MCG) communicates using LTE cells, and SeNB (SCG) communicates using NR/<NUM> cells.

Note that the configurations of the frequency band for use in each radio base station are by no means limited to these.

A structure may be employed here in which wire connection (for example, optical fiber, which is in compliance with the CPRI (Common Public Radio Interface), the X2 interface and so on) or wireless connection is established between the radio base station <NUM> and the radio base station <NUM> (or between two radio base stations <NUM>).

In the radio communication system <NUM>, as radio access schemes, orthogonal frequency division multiple access (OFDMA) is applied to the downlink, and single-carrier frequency division multiple access (SC-FDMA) is applied to the uplink.

OFDMA is a multi-carrier communication scheme to perform communication by dividing a frequency bandwidth into a plurality of narrow frequency bandwidths (subcarriers) and mapping data to each subcarrier. SC-FDMA is a single-carrier communication scheme to mitigate interference between terminals by dividing the system bandwidth into bands formed with one or continuous resource blocks per terminal, and allowing a plurality of terminals to use mutually different bands. Note that uplink and downlink radio access schemes are not limited to the combination of these, and other radio access schemes may be used.

In the radio communication system <NUM>, a downlink shared channel (PDSCH (Physical Downlink Shared CHannel)), which is shared by each user terminal <NUM>, a broadcast channel (PBCH (Physical Broadcast CHannel)), downlink L1/L2 control channels and so on are used as downlink channels. User data, higher layer control information, SIBs (System Information Blocks) and so on are communicated in the PDSCH. Also, the MIB (Master Information Block) is communicated in the PBCH. A shared control channel that reports the presence or absence of a paging channel is mapped to a downlink L1/L2 control channel (for example, PDCCH), and the data of the paging channel (PCH) is mapped to the PDSCH. Downlink reference signals, uplink reference signals and physical downlink synchronization signals are arranged separately.

The downlink L1/L2 control channels include a PDCCH (Physical Downlink Control CHannel), an EPDCCH (Enhanced Physical Downlink Control CHannel), a PCFICH (Physical Control Format Indicator CHannel), a PHICH (Physical Hybrid-ARQ Indicator CHannel) and so on. Downlink control information (DCI), including PDSCH and PUSCH scheduling information, is communicated by the PDCCH. The number of OFDM symbols to use for the PDCCH is communicated by the PCFICH. HARQ (Hybrid Automatic Repeat reQuest) delivery acknowledgment information (also referred to as, for example, "retransmission control information," "HARQ-ACK," "ACK/NACK," and so forth) in response to the PUSCH is communicated by the PHICH. The EPDCCH is frequency-division-multiplexed with the PDSCH (downlink shared data channel) and used to communicate DCI and so on, like the PDCCH.

In the radio communication system <NUM>, an uplink shared channel (PUSCH (Physical Uplink Shared CHannel)), which is shared by each user terminal <NUM>, an uplink control channel (PUCCH (Physical Uplink Control CHannel)), a random access channel (PRACH (Physical Random Access CHannel)) and so on are used as uplink channels. User data and higher layer control information are communicated by the PUSCH. Also, downlink radio quality information (CQI (Channel Quality Indicator)), delivery acknowledgement information and so on are communicated by the PUCCH. By means of the PRACH, random access preambles for establishing connections with cells are communicated.

In the radio communication system <NUM>, cell-specific reference signals (CRSs), channel state information reference signals (CSI-RSs), demodulation reference signals (DMRSs), positioning reference signals (PRSs) and so on are communicated as downlink reference signals. Also, in the radio communication system <NUM>, measurement reference signals (SRS (Sounding Reference Signals)), demodulation reference signals (DMRSs) and so on are communicated as uplink reference signals. Note that DMRSs may be referred to as "user terminal-specific reference signals (UE-specific Reference Signals). " Also, the reference signals to be communicated are by no means limited to these.

<FIG> is a diagram to show an example of an overall structure of a radio base station according to one embodiment of the present invention. A radio base station <NUM> has a plurality of transmitting/receiving antennas <NUM>, amplifying sections <NUM>, transmitting/receiving sections <NUM>, a baseband signal processing section <NUM>, a call processing section <NUM> and a communication path interface <NUM>. Note that one or more transmitting/receiving antennas <NUM>, amplifying sections <NUM> and transmitting/receiving sections <NUM> may be provided.

In the baseband signal processing section <NUM>, the user data is subjected to transmission processes, including a PDCP (Packet Data Convergence Protocol) layer process, user data division and coupling, RLC (Radio Link Control) layer transmission processes such as RLC retransmission control, MAC (Medium Access Control) retransmission control (for example, an HARQ (Hybrid Automatic Repeat reQuest) transmission process), scheduling, transport format selection, channel coding, an inverse fast Fourier transform (IFFT) process and a precoding process, and the result is forwarded to each transmitting/receiving section <NUM>. Furthermore, downlink control signals are also subjected to transmission processes such as channel coding and an inverse fast Fourier transform, and forwarded to the transmitting/receiving sections <NUM>.

Baseband signals that are precoded and output from the baseband signal processing section <NUM> on a per antenna basis are converted into a radio frequency band in the transmitting/receiving sections <NUM>, and then transmitted. The radio frequency signals having been subjected to frequency conversion in the transmitting/receiving sections <NUM> are amplified in the amplifying sections <NUM>, and transmitted from the transmitting/receiving antennas <NUM>. The transmitting/receiving sections <NUM> can be constituted by transmitters/receivers, transmitting/receiving circuits or transmitting/receiving apparatus that can be described based on general understanding of the technical field to which the present invention pertains. Note that a transmitting/receiving section <NUM> may be structured as a transmitting/receiving section in one entity, or may be constituted by a transmitting section and a receiving section.

In the baseband signal processing section <NUM>, user data that is included in the uplink signals that are input is subjected to a fast Fourier transform (FFT) process, an inverse discrete Fourier transform (IDFT) process, error correction decoding, a MAC retransmission control receiving process, and RLC layer and PDCP layer receiving processes, and forwarded to the higher station apparatus <NUM> via the communication path interface <NUM>. The call processing section <NUM> performs call processing such as setting up and releasing communication channels, manages the state of the radio base station <NUM> and manages the radio resources.

The communication path interface section <NUM> transmits and receives signals to and from the higher station apparatus <NUM> via a predetermined interface. Also, the communication path interface <NUM> may transmit and receive signals (backhaul signaling) with other radio base stations <NUM> via an inter-base station interface (which is, for example, optical fiber that is in compliance with the CPRI (Common Public Radio Interface), the X2 interface, etc.).

Note that the transmitting/receiving sections <NUM> include predetermined bit information to represents the configurations of a control resource set in an SS block (for example, the NR-PBCH) and transmit this SS block. Also, the transmitting/receiving sections <NUM> transmit a downlink control channel (NR-PDCCH) in the control resource set indicated in this SS block. Also, the transmitting/receiving section <NUM> may report a table, in which configurations of control resource sets are defined, to the UE, via higher layer signaling and/or others. In addition, the transmitting/receiving sections <NUM> select predetermined information, from a plurality of pieces of information (options) that indicate relative positions of the control resource set with respect to the SS block, and control transmission.

<FIG> is a diagram to show an example of a functional structure of a radio base station according to one embodiment of the present invention. Note that, although this example primarily shows functional blocks that pertain to characteristic parts of the present embodiment, the radio base station <NUM> has other functional blocks that are necessary for radio communication as well.

The baseband signal processing section <NUM> has a control section (scheduler) <NUM>, a transmission signal generation section <NUM>, a mapping section <NUM>, a received signal processing section <NUM> and a measurement section <NUM>. Note that these configurations have only to be included in the radio base station <NUM>, and some or all of these configurations may not be included in the baseband signal processing section <NUM>. The baseband signal processing section <NUM> has digital beamforming functions for providing digital beamforming.

The control section <NUM> controls, for example, generation of signals in the transmission signal generation section <NUM> (including signals that correspond to synchronization signals, the MIB, the paging channel and the broadcast channel), allocation of signals in the mapping section <NUM>, and so on.

The control section <NUM> exerts control so that predetermined bit information to represents the configurations of a control resource set is included in an SS block (for example, the NR-PBCH) and transmitted. In addition, the control section <NUM> exerts control so that a downlink control channel (NR-PDCCH) is transmitted in the control resource set indicated in this SS block. Furthermore, the control section <NUM> may select predetermined information, from a plurality of pieces of information (options) that indicate relative positions of the control resource set with respect to the SS block, and control transmission directed to user terminals.

The transmission signal generation section <NUM> generates downlink signals (downlink control signals, downlink data signals, downlink reference signals and so on) as commanded by the control section <NUM>, and outputs these signals to the mapping section <NUM>. The transmission signal generation section <NUM> can be constituted by a signal generator, a signal generating circuit or signal generating apparatus that can be described based on general understanding of the technical field to which the present invention pertains.

For example, the transmission signal generation section <NUM> generates DL assignments, which indicate downlink signal allocation information, and UL grants, which indicate uplink signal allocation information, as commanded by the control section <NUM>. Also, downlink data signals are subjected to the coding process, the modulation process and so on, by using coding rates and modulation schemes that are determined based on, for example, channel state information (CSI) from each user terminal <NUM>.

The mapping section <NUM> maps the downlink signals generated in the transmission signal generation section <NUM> to predetermined radio resources as commanded by the control section <NUM>, and outputs these to the transmitting/receiving sections <NUM>. The mapping section <NUM> can be constituted by a mapper, a mapping circuit or mapping apparatus that can be described based on general understanding of the technical field to which the present invention pertains.

The received signal processing section <NUM> performs receiving processes (for example, demapping, demodulation, decoding and so on) of received signals that are input from the transmitting/receiving sections <NUM>. Here, the received signals include, for example, uplink signals transmitted from the user terminals <NUM> (uplink control signals, uplink data signals, uplink reference signals, etc.). The received signal processing section <NUM> can be constituted by a signal processor, a signal processing circuit or signal processing apparatus that can be described based on general understanding of the technical field to which the present invention pertains.

The received signal processing section <NUM> outputs the decoded information, acquired through the receiving processes, to the control section <NUM>. For example, when a PUCCH to contain an HARQ-ACK is received, the received signal processing section <NUM> outputs this HARQ-ACK to the control section <NUM>. Also, the received signal processing section <NUM> outputs the received signals, the signals after the receiving processes and so on, to the measurement section <NUM>.

When signals are received, the measurement section <NUM> may measure, for example, the received power (for example, RSRP (Reference Signal Received Power)), the received quality (for example, RSRQ (Reference Signal Received Quality)), the SINR (Signal to Interference plus Noise Ratio), channel states and so on of the received signals. The measurement results may be output to the control section <NUM>.

<FIG> is a diagram to show an example of an overall structure of a user terminal according to one embodiment of the present invention. A user terminal <NUM> has a plurality of transmitting/receiving antennas <NUM>, amplifying sections <NUM>, transmitting/receiving sections <NUM>, a baseband signal processing section <NUM> and an application section <NUM>. Note that one or more transmitting/receiving antennas <NUM>, amplifying sections <NUM> and transmitting/receiving sections <NUM> may be provided.

Radio frequency signals that are received in the transmitting/receiving antennas <NUM> are amplified in the amplifying sections <NUM>. The transmitting/receiving sections <NUM> receive the downlink signals amplified in the amplifying sections <NUM>. The received signals are subjected to frequency conversion and converted into the baseband signal in the transmitting/receiving sections <NUM>, and output to the baseband signal processing section <NUM>. The transmitting/receiving sections <NUM> can be constituted by transmitters/receivers, transmitting/receiving circuits or transmitting/receiving apparatus that can be described based on general understanding of the technical field to which the present invention pertains. Note that a transmitting/receiving section <NUM> may be structured as a transmitting/receiving section in one entity, or may be constituted by a transmitting section and a receiving section.

In the baseband signal processing section <NUM>, the baseband signal that is input is subjected to an FFT process, error correction decoding, a retransmission control receiving process, and so on. Downlink user data is forwarded to the application section <NUM>. The application section <NUM> performs processes related to higher layers above the physical layer and the MAC layer, and so on. Furthermore, in the downlink data, broadcast information is also forwarded to the application section <NUM>.

Meanwhile, uplink user data is input from the application section <NUM> to the baseband signal processing section <NUM>. The baseband signal processing section <NUM> performs a retransmission control transmission process (for example, an HARQ transmission process), channel coding, precoding, a discrete Fourier transform (DFT) process, an IFFT process and so on, and the result is forwarded to the transmitting/receiving sections <NUM>. Baseband signals that are output from the baseband signal processing section <NUM> are converted into a radio frequency band in the transmitting/receiving sections <NUM> and transmitted. The radio frequency signals that are subjected to frequency conversion in the transmitting/receiving sections <NUM> are amplified in the amplifying sections <NUM>, and transmitted from the transmitting/receiving antennas <NUM>.

Note that the transmitting/receiving sections <NUM> may furthermore have an analog beamforming section that forms analog beams. The analog beamforming section may be constituted by an analog beamforming circuit (for example, a phase shifter, a phase shifting circuit, etc.) or analog beamforming apparatus (for example, a phase shifting device) that can be described based on general understanding of the technical field to which the present invention pertains. Furthermore, the transmitting/receiving antennas <NUM> may be constituted by, for example, array antennas.

The transmitting/receiving sections <NUM> receive an SS block (for example, NR-PBCH), which contains predetermined bit information to represents the configurations of a control resource set. Also, the transmitting/receiving sections <NUM> receive a downlink control channel (NR-PDCCH) in the control resource set indicated in this SS block. In addition, the transmitting/receiving sections <NUM> may receive a table, in which control resource set configurations are set forth, via higher layer signaling and so on. Also, the transmitting/receiving sections <NUM> receive predetermined information, which is selected by the base station from a plurality of pieces of information (options) that represents the relative position of the control resource set with respect to this SS block.

<FIG> is a diagram to show an example of a functional structure of a user terminal according to one embodiment of the present invention. Note that, although this example primarily shows functional blocks that pertain to characteristic parts of the present embodiment, the user terminal <NUM> has other functional blocks that are necessary for radio communication as well.

The control section <NUM> controls, for example, generation of signals in the transmission signal generation section <NUM>, allocation of signals in the mapping section <NUM>, and so on. Furthermore, the control section <NUM> controls the signal receiving processes in the received signal processing section <NUM>, and the measurements of signals in the measurement section <NUM>.

The control section <NUM> determines the relative position of the control resource set with respect to the SS block based on predetermined bit information, and controls the receipt of the downlink control channel. For example, the control section <NUM> calculates candidate amounts of shift (X and/or Y) in the forward and backward directions of the SS block in the time direction, based on predetermined bit information (for example, a bit to specify X or Y). In this case, the control section <NUM> may determine a plurality of candidate amounts of shift by using a predetermined equation. Also, the equation to use to calculate the amount of shift may be defined differently depending on subcarrier spacing or SS block configuration (for example, the number of SS blocks in a row, etc.).

The candidate positions of the control resource set, indicated by means of predetermined bit information, may be defined in the table, and, as candidate positions for the control resource set, at least the amount of shift in the forward direction of the SS block in the time direction, the amount of shift in the backward direction of the SS block in the time direction, and information that represents a specific symbol may be defined in the table. For at least a part of a plurality of start position candidates of the control resource set indicated by the information, a symbol is indicated as start position.

The control section <NUM> judges the content of the predetermined bit information (for example, the table used) included in the SS block (for example, the NR-PBCH) based on the frequency band, and, optionally, on the subcarrier spacing, that is used to transmit the SS block, and control the receipt of the downlink control channel. For example, the control section <NUM> looks up different tables depending on the frequency band, and, optionally, on the subcarrier spacing, that is used to transmit the SS block to determine the content of the predetermined bit information.

Different tables are applied between the first frequency band (for example, lower than <NUM>) and a second frequency band (for example, <NUM> or above). Optionally, different tables are also used for a first subcarrier spacing (<NUM>/<NUM>/<NUM>/<NUM>) and a second subcarrier spacing (<NUM>).

For example, in these different tables, at least different numbers of patterns of control resource set start positions are set forth. Also, the number of bits to constitute the bit information may vary depending on the subcarrier spacing and/or the frequency band used to transmit the SS block. In at least one of these different tables, the start positions of control resource sets may be defined using SS block indices.

The transmission signal generation section <NUM> generates uplink signals (uplink control signals, uplink data signals, uplink reference signals, etc.) as commanded by the control section <NUM>, and outputs these signals to the mapping section <NUM>. The transmission signal generation section <NUM> can be constituted by a signal generator, a signal generating circuit or signal generating apparatus that can be described based on general understanding of the technical field to which the present invention pertains.

For example, the transmission signal generation section <NUM> generates uplink control signals related to delivery acknowledgement information, channel state information (CSI) and so on, as commanded by the control section <NUM>. Also, the transmission signal generation section <NUM> generates uplink data signals as commanded by the control section <NUM>. For example, when a UL grant is included in a downlink control signal that is indicated from the radio base station <NUM>, the control section <NUM> commands the transmission signal generation section <NUM> to generate an uplink data signal.

The mapping section <NUM> maps the uplink signals generated in the transmission signal generation section <NUM> to radio resources as commanded by the control section <NUM>, and outputs the result to the transmitting/receiving sections <NUM>. The mapping section <NUM> can be constituted by a mapper, a mapping circuit or mapping apparatus that can be described based on general understanding of the technical field to which the present invention pertains.

The received signal processing section <NUM> performs receiving processes (for example, demapping, demodulation, decoding and so on) of received signals that are input from the transmitting/receiving sections <NUM>. Here, the received signals include, for example, downlink signals (downlink control signals, downlink data signals, downlink reference signals and so on) that are transmitted from the radio base station <NUM>. The received signal processing section <NUM> can be constituted by a signal processor, a signal processing circuit or signal processing apparatus that can be described based on general understanding of the technical field to which the present invention pertains. Also, the received signal processing section <NUM> can constitute the receiving section according to the present invention.

As commanded by the control section <NUM>, the received signal processing section <NUM> receives synchronization signals and a broadcast channel, which the radio base station transmits by applying beamforming. In particular, the received signal processing section <NUM> receives the synchronization signals and the broadcast channel that are allocated to at least one of a plurality of time fields (for example, symbols) constituting a predetermined transmission time interval (for example, a subframe or a slot).

The received signal processing section <NUM> outputs the decoded information, acquired through the receiving processes, to the control section <NUM>. The received signal processing section <NUM> outputs, for example, broadcast information, system information, RRC signaling, DCI and so on, to the control section <NUM>. Also, the received signal processing section <NUM> outputs the received signals, the signals after the receiving processes and so on, to the measurement section <NUM>.

For example, the measurement section <NUM> performs measurements using the beamforming RS transmitted from the radio base station <NUM>.

The measurement section <NUM> may measure, for example, the received power (for example, RSRP), the received quality (for example, RSRQ, received SINR), the channel states and so on of the received signals. The measurement results may be output to the control section <NUM>. For example, the measurement section <NUM> performs RRM measurements using synchronization signals.

Note that the block diagrams that have been used to describe the above embodiments show blocks in functional units. These functional blocks (components) may be implemented in arbitrary combinations of hardware and/or software. Also, the means for implementing each functional block is not particularly limited. That is, each functional block may be realized by one piece of apparatus that is physically and/or logically aggregated, or may be realized by directly and/or indirectly connecting two or more physically and/or logically separate pieces of apparatus (via wire or wireless, for example) and using these multiple pieces of apparatus.

For example, the radio base station, user terminals and so on according to embodiments of the present invention may function as a computer that executes the processes of the radio communication method of the present invention. <FIG> is a diagram to show an example hardware structure of a radio base station and a user terminal according to an embodiment of the present invention. Physically, the above-described radio base stations <NUM> and user terminals <NUM> may be formed as computer apparatus that includes a processor <NUM>, a memory <NUM>, a storage <NUM>, communication apparatus <NUM>, input apparatus <NUM>, output apparatus <NUM> and a bus <NUM>.

Note that the hardware structure of a radio base station <NUM> and a user terminal <NUM> may be designed to include one or more of each apparatus shown in the drawing, or may be designed not to include part of the apparatus.

Furthermore, processes may be implemented with one processor, or processes may be implemented in sequence, or in different manners, on one or more processors.

Each function of the radio base station <NUM> and the user terminal <NUM> is implemented by reading predetermined software (program) on hardware such as the processor <NUM> and the memory <NUM>, and by controlling the calculations in the processor <NUM>, the communication in the communication apparatus <NUM>, and the reading and/or writing of data in the memory <NUM> and the storage <NUM>.

The processor <NUM> may control the whole computer by, for example, running an operating system. The processor <NUM> may be configured with a central processing unit (CPU), which includes interfaces with peripheral apparatus, control apparatus, computing apparatus, a register and so on. For example, the above-described baseband signal processing section <NUM> (<NUM>), call processing section <NUM> and others may be implemented by the processor <NUM>.

The memory <NUM> is a computer-readable recording medium, and may be constituted by, for example, at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically EPROM), a RAM (Random Access Memory) and/or other appropriate storage media. The memory <NUM> may be referred to as a "register," a "cache," a "main memory (primary storage apparatus)" and so on. The memory <NUM> can store executable programs (program codes), software modules and so on for implementing the radio communication methods according to embodiments of the present invention.

The communication apparatus <NUM> is hardware (transmitting/receiving device) for allowing inter-computer communication by using wired and/or wireless networks, and may be referred to as, for example, a "network device," a "network controller," a "network card," a "communication module" and so on. The communication apparatus <NUM> may be configured to include a high frequency switch, a duplexer, a filter, a frequency synthesizer and so on in order to realize, for example, frequency division duplex (FDD) and/or time division duplex (TDD). For example, the above-described transmitting/receiving antennas <NUM> (<NUM>), amplifying sections <NUM> (<NUM>), transmitting/receiving sections <NUM> (<NUM>), communication path interface <NUM> and so on may be implemented by the communication apparatus <NUM>.

Furthermore, each apparatus, including the processor <NUM> and/or the memory <NUM>, is connected via a bus <NUM> for communicating information.

Note that the terminology used in this specification and the terminology that is needed to understand this specification may be replaced by other terms that convey the same or similar meanings. For example, "channels" and/or "symbols" may be replaced by "signals (or "signaling"). " Also, "signals" may be "messages. " A reference signal may be abbreviated as an "RS," and may be referred to as a "pilot," a "pilot signal" and so on, depending on which standard applies. Furthermore, a "component carrier (CC)" may be referred to as a "cell," a "frequency carrier," a "carrier frequency" and so on.

Furthermore, a radio frame may be comprised of one or more periods (frames) in the time domain. Each of one or more periods (frames) constituting a radio frame may be referred to as a "subframe. " Furthermore, a subframe may be comprised of one or more slots in the time domain. Furthermore, a slot may be comprised of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, and so on).

A radio frame, a subframe, a slot and a symbol all represent the time unit in signal communication. A radio frame, a subframe, a slot and a symbol may be each called by other applicable names. For example, one subframe may be referred to as a "transmission time interval (TTI)," a plurality of consecutive subframes may be referred to as a "TTI," or one slot may be referred to as a "TTI. " That is, a subframe and/or a TTI may be a subframe (<NUM>) in existing LTE, may be a shorter period than <NUM> (for example, one to thirteen symbols), or may be a longer period of time than <NUM>.

For example, in LTE systems, a radio base station schedules the allocation of radio resources (such as the frequency bandwidth and/or the transmission power that can be used by each user terminal) for each user terminal in TTI units. TTIs may be transmission time units for channel-encoded data packets (transport blocks), or may be the unit of processing in scheduling, link adaptation and so on.

A TTI having a time duration of <NUM> may be referred to as a "normal TTI (TTI in LTE Rel. <NUM> to <NUM>)," a "long TTI," a "normal subframe," a "long subframe," and so on. A TTI that is shorter than a normal TTI may be referred to as a "shortened TTI," a "short TTI," a "shortened subframe," a "short subframe," and so on.

A resource block (RB) is the unit of resource allocation in the time domain and the frequency domain, and may include one or a plurality of consecutive subcarriers in the frequency domain. Also, an RB may include one or more symbols in the time domain, and may be one slot, one subframe or one TTI in length. One TTI and one subframe each may be comprised of one or more resource blocks. Note that an RB may be referred to as a "physical resource block (PRB (Physical RB))," a "PRB pair," an "RB pair," and so on.

Note that the above-described structures of radio frames, subframes, slots, symbols and so on are merely examples. For example, configurations such as the number of subframes included in a radio frame, the number of slots included in a subframe, the number of symbols and RBs included in a slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol duration and the cyclic prefix (CP) duration can be variously changed.

Also, the information and parameters described in this specification may be represented in absolute values or in relative values with respect to predetermined values, or may be represented in other information formats. For example, radio resources may be specified by predetermined indices. In addition, equations to use these parameters and so on may be used, apart from those explicitly disclosed in this specification.

The information, signals and so on that are input and/or output may be stored in a specific location (for example, a memory), or may be managed using a management table. The information, signals and so on to be input and/or output can be overwritten, updated or appended. The information, signals and so on that are output may be deleted. The information, signals and so on that are input may be transmitted to other pieces of apparatus.

Reporting of information is by no means limited to the aspects/embodiments described in this specification, and other methods may be used as well. For example, reporting of information may be implemented by using physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI), higher layer signaling (for example, RRC (Radio Resource Control) signaling, broadcast information (the master information block (MIB), system information blocks (SIBs) and so on), MAC (Medium Access Control) signaling and so on), and other signals and/or combinations of these.

Also, reporting of predetermined information (for example, reporting of information to the effect that "X holds") does not necessarily have to be sent explicitly, and can be sent implicitly (by, for example, not reporting this piece of information).

Decisions may be made in values represented by one bit (<NUM> or <NUM>), may be made in Boolean values that represent true or false, or may be made by comparing numerical values (for example, comparison against a predetermined value).

Software, whether referred to as "software," "firmware," "middleware," "microcode" or "hardware description language," or called by other names, should program codes, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions and so on.

As examples for "base station (BS)," "radio base station," "eNB," "cell," "sector," "cell group," "carrier," and "component carrier , "fixed station," "NodeB," "eNodeB (eNB)," "access point," "transmission point," "receiving point," "femto cell," "small cell" maybe used.

A base station can accommodate one or more (for example, three) cells (also referred to as "sectors"). When a base station accommodates a plurality of cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area can provide communication services through base station subsystems (for example, indoor small base stations (RRHs (Remote Radio Heads))). The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or a base station subsystem that provides communication services within this coverage.

As examples of terminals, "mobile stations", "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 terminal," "remote terminal," "handset," "user agent," "mobile client," "client" may be used.

Furthermore, the radio base stations in this specification may be interpreted as user terminals. 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 among a plurality of user terminals (D2D (Device-to-Device)). In this case, user terminals <NUM> may have the functions of the radio base stations <NUM> described above. In addition, words such as "uplink" and/or "downlink" may be interpreted as "side. " For example, an uplink channel may be interpreted as a side channel.

Certain actions which have been described in this specification to be performed by base stations may, in some cases, be performed by higher nodes (upper nodes). In a network comprised of one or more network nodes with base stations, it is clear that various operations that are performed to communicate with terminals can be performed by base stations, one or more network nodes (for example, MMEs (Mobility Management Entities), S-GW (Serving-Gateways), and so on may be possible, but these are not limiting) other than base stations, or combinations of these.

The aspects/embodiments illustrated in this specification may be applied to systems that use LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER <NUM>, IMT-Advanced, <NUM> (4th generation mobile communication system), <NUM> (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), CDMA <NUM>, UMB (Ultra Mobile Broadband), IEEE <NUM> (Wi-Fi (registered trademark)), IEEE <NUM> (WiMAX (registered trademark)), IEEE <NUM>, UWB (Ultra-WideBand), Bluetooth (registered trademark) and other adequate radio communication methods, and/or next-generation systems that are enhanced based on these.

Reference to elements with designations such as "first," "second" and so on as used herein does not generally limit the number/quantity or order of these elements. These designations are used herein only for convenience, as a method of distinguishing between two or more elements. In this way, reference to the first and second elements does not imply that only two elements may be employed, or that the first element must precede the second element in some way.

As used herein, the terms "connected" and "coupled," or any variation of these terms, mean all direct or indirect connections or coupling between two or more elements, and may 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 of these. As used herein, two elements may be considered "connected" or "coupled" to each other by using one or more electrical wires, cables and/or printed electrical connections, and, as a number of non-limiting and non-inclusive examples, by using electromagnetic energy, such as electromagnetic energy having wavelengths in the radio frequency, microwave and optical regions (both visible and invisible).

Claim 1:
A terminal (<NUM>) comprising:
a receiving section (<NUM>) configured to receive a synchronization signal/physical broadcast channel block, SS/PBCH block, including information that indicates a configuration of a control resource set; and
a control section (<NUM>) configured to determine a position of the control resource set relative to the SS/PBCH block based on the information,
wherein the control section is configured to apply different association information in a first frequency band and a second frequency band, the association information defining a start symbol position in a time domain of the control resource set using an SS/PBCH block index for at least a part of a plurality of start position candidates of the control resource set indicated by the information, and
wherein the control section (<NUM>) is configured to control a reception of a downlink control channel based on information about different start position candidates for the control resource set.