JP2021057911A - Terminal, radio base station, radio communication system, and radio communication method - Google Patents

Abstract

To perform efficient measurement while inhibiting increase in network side processing load and/or signaling overhead.SOLUTION: A terminal of the invention comprises: a reception section that receives information indicating a synchronization signal (SS) block for measurement in a measurement period; and a control section that measures at least one of Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), and a Signal to Interference plus Noise Ratio (SINR) using the SS block indicated by the information. When a plurality of measurement periods are configured, the information is associated with at least two of the plurality of measurement periods.SELECTED DRAWING: Figure 7

Description

The present invention relates to terminals, wireless base stations, wireless communication systems and wireless communication methods in next-generation mobile communication systems.

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

Successor system of LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G + (plus), NR (New Radio), NX (New radio access), FX (Future generation radio access), LTE (Also referred to as Rel.14 or 15 or later) is also being considered.

In an existing LTE system (for example, LTE Rel. 8-13), a user terminal (UE: User Equipment) uses a synchronization signal (PSS (Primary Synchronization Signal)) by an initial access procedure (also called a cell search or the like). And / or SSS (Secondary Synchronization Signal)) is detected, synchronized with the network (for example, base station (eNB (eNode B))), and the cell to be connected is identified (for example, by cell ID (Identifier)). Identify).

In addition, the user terminal uses a master information block (MIB: Master Information Block) and a downlink (DL) shared channel (PDSCH: Physical Downlink Shared Channel) transmitted on a broadcast channel (PBCH: Physical Broadcast Channel) after a cell search. It receives a transmitted system information block (SIB: System Information Block) and acquires setting information (may be called broadcast information, system information, etc.) for communication with a network.

3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010

In future wireless communication systems (eg, NR or 5G), synchronous signals (also referred to as PSS and / or SSS, or NR-PSS and / or NR-SSS, etc.) and broadcast channels (PBCH, NR-PBCH, etc.) It is being considered to define a resource unit including (referred to as) as a synchronization signal block. Further, it is being studied that a set of one or more SS blocks is defined as an SS burst, and an SS burst set, which is a set of one or more SS bursts, is repeated at a predetermined cycle.

Further, in future wireless communication systems, the SS block is used to receive power (for example, RSRP: Reference Signal Received Power) and reception quality (for example, RSRQ: Reference Signal Received Quality or SINR: Signal to Interference plus Noise Ratio). And measuring at least one of the reception strength (for example, RSSI: Reference Signal Strength Indicator) (also referred to as measurement or RRM measurement (Radio Resource Management Measurement)) is also being considered.

On the other hand, it is assumed that there are SS blocks that are not actually transmitted in the SS burst set, so in order to efficiently perform measurement using the SS block, they are actually transmitted in the SS burst set. It is desirable to notify the user terminal of the SS block. However, when notifying the user terminal of the SS block actually transmitted, the processing load and / or the signaling overhead on the network side may increase.

The present invention has been made in view of this point, and is a terminal, a wireless base station, and a wireless communication system capable of efficiently performing measurement while suppressing an increase in processing load and / or signaling overhead on the network side. And one of the purposes is to provide a wireless communication method.

A terminal according to one aspect of the present invention uses an RSRP (Reference Signal Received Power) using a receiving unit that receives information indicating a synchronization signal (SS) block for measurement during a measurement period and the SS block indicated by the information. ), RSRQ (Reference Signal Received Quality), and a control unit that measures at least one of SINR (Signal to Interference plus Noise Ratio). It is characterized in that it is associated with at least two of the plurality of measurement periods.

According to the present invention, measurement can be efficiently performed while suppressing an increase in processing load and / or signaling overhead on the network side.

FIG. 1A-1D is a diagram showing an example of the configuration of the SS block. 2A and 2B are diagrams showing an example of an SS burst set. 3A and 3B are diagrams showing an example of setting SS burst sets in a plurality of cells. It is a figure which shows an example of the control of the measurement which concerns on the 1st aspect. It is a figure which shows an example of the control of the measurement which concerns on the 2nd aspect. It is a figure which shows an example of the control of the measurement which concerns on the 3rd aspect. It is a figure which shows an example of the control of the measurement which concerns on the 4th aspect. It is a figure which shows an example of the schematic structure of the wireless communication system which concerns on this embodiment. It is a figure which shows an example of the whole structure of the radio base station which concerns on this embodiment. It is a figure which shows an example of the functional structure of the radio base station which concerns on this embodiment. It is a figure which shows an example of the whole structure of the user terminal which concerns on this embodiment. It is a figure which shows an example of the functional structure of the user terminal which concerns on this embodiment. It is a figure which shows an example of the hardware composition of the radio base station and the user terminal which concerns on this embodiment.

In future wireless communication systems (for example, LTE Rel.14, 15 or later, 5G, NR, etc., hereinafter also referred to as NR), a resource unit including at least a synchronization signal and a broadcast channel is defined as a synchronization signal (SS) block. , SS blocks are being considered for communication (eg, initial access and / or measurement).

The SS block may be, for example, a primary sync signal (also referred to as PSS, NR-PSS, first sync signal or first sync channel, etc.) and / or a secondary sync signal (SSS, NR-SSS, second sync signal or A second synchronization channel or the like) and a broadcast channel (PBCH: Physical Broadcast Channel, NR-PBCH, broadcast signal, master information block (MIB) or system information, etc.) may be included at least. .. A synchronization signal different from PSS and SSS (for example, TSS: Tertiary SS) may be included in the SS block. Hereinafter, NR-PSS and / or NR-SSS will also be referred to as NR-PSS / SSS.

Further, the SS block is composed of one or more symbols (for example, an OFDM symbol). Specifically, the SS block may be composed of a plurality of consecutive symbols. Within the SS block, NR-PSS, NR-SSS and NR-PBCH may be arranged in one or more different symbols. For example, it is also considered that the SS block is composed of 4 symbols including 1 symbol NR-PSS, 1 symbol NR-SSS, and 2 symbols NR-PBCH.

FIG. 1 is a diagram showing an example of the configuration of the SS block. Although FIGS. 1A to 1D exemplify an SS block composed of four symbols, the structure of the SS block is not limited to that shown in FIGS. 1A to 1D. For example, the NR-PBCH may be arranged in 3 or more symbols, and the SS block may be composed of 5 or more symbols.

NR-PBCH may be placed on two consecutive symbols after NR-PSS and NR-SSS (FIG. 1A), or on two consecutive symbols between NR-PSS and NR-SSS. It may be (Fig. 1D). Alternatively, the NR-PBCH may be discretely arranged in one symbol after NR-PSS and one symbol after NR-SSS (FIG. 1B), or with one symbol before NR-PSS. It may be arranged discretely with one symbol after NR-SSS (Fig. 1C).

As shown in FIGS. 1A to 1D, the NR-PSS / SSS and the NR-PBCH may be arranged (mapped) in a frequency domain (or frequency band) having a different bandwidth (number of resource blocks). For example, NR-PSS / SSS is mapped to the first frequency domain (eg, 127 series (or 127 subcarriers)) and NR-PBCH is mapped to the second frequency domain (eg, 288) wider than the first frequency domain. It may be mapped to a subcarrier).

Further, the reference signal used for demodulation of the NR-PBCH (also referred to as a demodulation reference signal or DMRS: Demodulation Reference Signal) may be mapped to at least a part of the second frequency region. The frequency domain (for example, the number of subcarriers) constituting NR-PSS / SSS and NR-PBCH is not limited to the above value.

Further, the first frequency region to which the NR-PSS / SSS is mapped and the second frequency region to which the NR-PBCH is mapped may be arranged so that at least a part thereof overlaps. For example, the center frequencies of NR-PSS, NR-SSS, and NR-PBCH may be arranged so as to match.

The set of one or more SS blocks configured as described above may be called an SS burst. The SS burst may be composed of SS blocks having continuous frequency and / or time resources, or may be composed of SS blocks having non-continuous frequency and / or time resources. The SS burst may be set at a predetermined period (which may be referred to as an SS burst period), or may be set at a non-period.

Further, one or more SS bursts may be referred to as an SS burst set (SS burst series). For example, a radio base station (BS (Base Station), transmission / reception point (TRP: Transmission / Reception Point), eNB (eNode B) or gNB (gNode B), etc.) and / or a user terminal is one SS burst set. NR-PSS, NR-SSS and NR-PBCH (also referred to as NR-PSS / SSS / PBCH, etc.) are beam sweeped and transmitted by using one or more SS bursts contained in the above. May be good. The SS burst set is set periodically. The UE may control the reception process on the assumption that the SS burst set is transmitted periodically (in the SS burst set periodicity).

FIG. 2 is a diagram showing an example of an SS burst set. FIG. 2A shows an example of beam sweeping. As shown in FIGS. 2A and 2B, the radio base station (gNB) may transmit different SS blocks using different beams with different beam directivities in time (beam sweeping). Although FIGS. 2A and 2B show an example using a multi-beam, it is also possible to transmit an SS block using a single beam.

As shown in FIG. 2B, an SS burst is composed of one or more SS blocks, and an SS burst set is composed of one or more SS bursts. For example, in FIG. 2B, it is assumed that the SS burst is composed of 8SS blocks # 0 to # 7, but the present invention is not limited to this. The SS blocks # 0 to # 7 may be transmitted by different beams # 0 to # 7 (FIG. 2A).

As shown in FIG. 2B, the SS burst set including SS blocks # 0 to # 7 may be transmitted so as not to exceed a predetermined period (for example, 5 ms or less, also referred to as SS burst set period, etc.). Since the SS burst set period changes according to the number of SS bursts (or SS blocks) in the SS burst set, it may be paraphrased as the number of SS bursts (or SS blocks).

Further, the SS burst set may be repeated in a predetermined cycle (for example, 5, 10, 20, 40, 80 or 160 ms, also referred to as an SS burst set cycle, etc.). The SS burst set timing (also referred to as SS burst set timing or the like) may be set based on at least one of the SS burst set period, the SS burst set period, and a predetermined offset value.

Each SS block in the SS burst set shown in FIG. 2B is identified by predetermined identification information (SS block identification information). Here, the SS block identification information may be an index (SS block index) that uniquely identifies the SS block in the SS burst set. Alternatively, the SS block identification information may be a combination of an SS block index that uniquely identifies the SS block in the SS burst and an index that uniquely identifies the SS burst in the SS burst set (SS burst index). .. The SS burst index is common among SS blocks in the same SS burst.

NR-PSS / SSS / PBCH are associated with each other in such SS block identification information. For example, the user terminal assumes that the NR-PSS / SSS / PBCH corresponding to the same SS block index is transmitted on the same antenna port (eg, with the same beam or the same precoding applied). You may. Further, at least one of the NR-PSS / SSS / PBCH sequence, mapping position (time and / or frequency resource), and the like may be associated with the SS block index.

It is assumed that there are SS blocks that are not actually transmitted in the SS burst set as described above. Therefore, in order to efficiently perform measurement using the SS block, it is considered to transmit information about the SS block actually transmitted in the SS burst set (SS block transmission information) to the user terminal. .. The SS block transmission information may be, for example, information indicating the time position of the SS block that is actually transmitted among the time positions of the SS block that are formally set (nominally).

By the way, in future wireless communication systems (for example, 5G or NR), at least the period, timing and period (the number of SS bursts or SS blocks in the SS burst set) of the SS burst set including the SS blocks actually transmitted. It is envisioned that multiple cells, one different from each other, will be provided.

FIG. 3 is a diagram showing an example of setting an SS burst set in a plurality of cells. In FIG. 3A, a plurality of cells provided at the same carrier frequency (also referred to as a component carrier (CC) or a frequency band) are shown. For example, in FIG. 3A, cells A and C have greater coverage than cells B and D. Note that at least a part of the coverage may overlap in at least two of cells A to B.

As shown in FIG. 3B, the period of the SS burst set including the SS block actually transmitted in each cell (SS burst set period) may be controlled based on the magnitude of the coverage of each cell. For example, cells A and C, which have a larger coverage than cells B and D, are expected to support a user terminal having a relatively high moving speed. Therefore, the SS burst set period 1 is the SS burst set of cells B and D. It may be set shorter than the period 2. On the other hand, since it is not assumed that the cells B and D support the user terminal having a high moving speed, the SS burst set cycle 2 may be set longer than the SS burst set cycle 1 of the cells A and C.

Further, as shown in FIG. 3B, the period of the SS burst set including the SS block actually transmitted in each cell (SS burst set period) is the number of beams sweeped in each cell and / or the coverage of each cell. It may be controlled based on the size of. For example, in cells A and C, it is assumed that beam sweeping is performed using a larger number of beams than cells B and D, so that the SS burst set period 1 is longer than the SS burst set period 2 of cells B and D. It may be set.

Further, as shown in FIG. 3B, the timing of the SS burst set including the SS block actually transmitted in each cell (SS burst set timing) may be controlled in consideration of the interference between the cells. For example, the SS burst set timing of the cell D may be given a predetermined offset value to the SS burst set timing of the cell B.

As described above, in the future wireless communication system, it is assumed that at least one of the period, timing, and period of the SS burst set in which one or more SS blocks are actually transmitted differs between a plurality of cells of the same frequency carrier. To. In this case, the network (for example, a radio base station) notifies the user terminal of at least one of one or more SS burst set periods, one or more SS burst set periods, and one or more SS burst set timings per frequency carrier. It is also assumed.

However, in future wireless communication systems as described above, in one or more cells (one or more serving cells and / or one or more neighbor cells) so that the user terminal can efficiently perform measurement. If the SS block that is actually transmitted tries to notify, the processing load and / or signaling overhead on the network side may increase.

For example, when notifying a user terminal of an SS block actually transmitted by one or more peripheral cells in addition to one or more serving cells in order to improve the efficiency of measurement, coordination between peripheral cells becomes complicated. As a result, the processing load on the network side may increase. Further, if an attempt is made to notify the SS block actually transmitted in each of the serving cell and the peripheral cells, the signaling overhead may increase.

Therefore, the present inventors have investigated a method for transmitting SS block transmission information that can realize efficient measurement in a user terminal while suppressing an increase in processing load and / or signaling overhead on the network side. It led to the invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the following, the case of notifying the SS block index as the SS block identification information will be described as an example, but when the SS block index and the SS burst index are notified as the SS block identification information, the following "SS block index" is referred to as "SS block". It can be applied in place of "index and / or SS burst index".

Further, in the following, "measurement" means at least one of reception power (for example, RSRP), reception quality (for example, RSRQ or SINR, etc.) and reception intensity (for example, RSSI) in a cell (serving cell and / or peripheral cell). It may be shown to measure (acquire) one. Further, the measurement may include, for example, at least one of RRM measurement, Intra-frequency Measurement, Inter-frequency Measurement, and Beam management measurement.

Further, in the following, "SS block (actually) transmitted in a serving cell and / or a peripheral cell" means that at least a part of SS blocks having the same SS block index in different SS burst sets is transmitted ( Or may be transmitted). Therefore, even if the SS block index is indicated by the SS block transmission information, it is assumed that the SS block having the SS block index is not transmitted in a part of the periodic SS burst set.

(First aspect)
In the first aspect, the user terminal receives SS block transmission information indicating the SS block transmitted in the serving cell. Further, the user terminal controls the measurement of the serving cell based on the SS block transmission information.

Here, the measurement period is a period used for measurement (for example, RRM measurement) in one or more cells (one or more serving cells and / or one or more peripheral cells). The measurement period may be the same period, timing and period as the SS burst set of a predetermined period formally (nominally) set in one or more cells. Alternatively, the measurement period may overlap with at least a part of the SS burst set of a predetermined cycle.

Further, the information (measurement period information) indicating the cycle (measurement cycle), timing (measurement timing) and period (measurement period) of the measurement period is system information (for example, RMSI: Remaining Minimum System Information) or higher layer signaling (for example, RMSI: Remaining Minimum System Information). For example, it may be transmitted from a network (for example, a radio base station) to a user terminal by RRC signaling). The measurement period information may be information indicating at least one of the period, timing, and period of the formal SS burst set.

Further, the SS block transmission information may be a list of SS block indexes of SS blocks transmitted by one or more serving cells during at least a part of the measurement period. Further, the SS block transmission information may be commonly used for one or more serving cells, and the SS block indicated by the SS block transmission information may be transmitted in at least one of the serving cells. The SS block transmission information may be transmitted from a network (for example, a radio base station) to a user terminal by system information (for example, RMSI) or higher layer signaling (for example, RRC signaling).

FIG. 4 is a diagram showing an example of control of the measurement according to the first aspect. In FIG. 4, it is assumed that the cell A is the serving cell of the user terminal and the cells B to D are peripheral cells of the user terminal. The serving cell may be one or more cells. Further, in FIG. 4, it is assumed that a measurement period of a predetermined cycle is set.

In FIG. 4, the user terminal receives a list showing the SS block index of the SS block actually transmitted in the serving cell A. For example, the list may include N SS block indexes {# 0, # 1, ..., # N-1}. The N SS block indexes do not have to be continuous, and may be SS block indexes of at least one SS block in the SS burst set.

Normally, when a user terminal performs measurement using an SS block, (1) the user terminal searches for NR-PSS / SSS included in the SS block during a measurement period set in a predetermined cycle, and NR-PSS / The measurement timing and cell ID are detected based on the SSS. (2) The user terminal measures at least one of the received power (for example, RSRP), reception quality (for example, RSRQ), and reception intensity (for example, RSSI) of the SS block. (3) The user terminal blindly detects the SS block index of the SS block based on the NR-PBCH or DMRS in the SS block.

In FIG. 4, since the user terminal receives a list showing the SS block index of the SS block actually transmitted in the serving cell A, it is necessary to blindly detect all the SS block indexes of the serving cell A over the entire measurement period of a predetermined cycle. Instead, measurement is performed using one or more SS blocks {# 0, # 1, ..., # N-1} actually transmitted in the serving cell A based on the above list. As described above, in FIG. 4, the target of blind detection in (3) serving cell A can be limited based on the above list, and the efficiency of measurement can be improved.

On the other hand, for the peripheral cells B to D, the user terminal blindly detects all SS block indexes during the entire measurement period, detects SS blocks transmitted during at least a part of the measurement period, and detects the detected SS. Measure using blocks.

For example, in the peripheral cells B and D of FIG. 4, the SS block is not actually transmitted in a part of the measurement period (for example, the second and third measurement periods from the left) repeated in a predetermined cycle, but the user terminal. Needs to perform blind detection assuming all SS block indexes including SS blocks that are not actually transmitted within the period including the measurement period. Further, in the peripheral cells B to D of FIG. 4, the SS block is transmitted in a part of one measurement period, but the user terminal cannot recognize the SS block in advance. Therefore, the user terminal needs to blindly detect all SS block indexes in the peripheral cells B to D over the entire one measurement period.

The user terminal is synchronized with the serving cell A, and at least one of the radio frame timing, the slot timing in the radio frame, the symbol timing, and the like is known. Since each SS block index is specified to be available only within the radio frame or at a specific timing within a predetermined period within the radio frame, the user terminal is specified to use the SS block index of the SS block actually transmitted in the serving cell A. Upon receiving the list indicating, it is possible to know at what timing within the wireless frame or within a predetermined period within the wireless frame each SS block is transmitted. Therefore, for the serving cell A, (1) the timing of the measurement in the measurement period can be limited, and the efficiency of the measurement can be improved.

In the first aspect, since the SS block transmission information indicates the SS block actually transmitted in the serving cell during at least a part of the measurement period of the predetermined cycle, the user terminal can limit the range of blind detection of the SS block index. , The efficiency of measurement in the serving cell can be improved.

Further, in the first aspect, since the SS block transmission information indicating the SS block actually transmitted by one or more peripheral cells is not transmitted, adjustment between the peripheral cells is not necessary, and the processing load on the network side and / Alternatively, an increase in signaling overhead can be suppressed.

(Second aspect)
In the second aspect, the user terminal receives SS block transmission information indicating the range of SS blocks transmitted in one or more peripheral cells. The user terminal controls the measurement of the peripheral cell based on the SS block transmission information. In the following, the differences from the first aspect will be mainly described.

In the second aspect, the SS block transmission information may include information (range information) indicating the range of the SS block index of the SS block transmitted in one or more peripheral cells in at least a part of the measurement period of a predetermined cycle. Good. For example, the range information may be the minimum value and the maximum value of the SS block index within the range. Alternatively, it may be index information that identifies a specific SS block index pattern defined in the specification. Further, the SS block transmission information may include a list of SS block indexes actually transmitted in one or more serving cells (first aspect) and the range information.

Further, the SS block transmission information may be shared among a plurality of peripheral cells. When the SS block transmission information is shared by a plurality of peripheral cells, the SS block within the range indicated by the SS block transmission information may be transmitted by at least one of the peripheral cells.

FIG. 5 is a diagram showing an example of control of the measurement according to the second aspect. In FIG. 5, the SS block transmission information includes the range of the SS block index of the SS block actually transmitted in one or more peripheral cells in addition to the list of the SS block index of the SS block actually transmitted in the serving cell A. It differs from FIG. 4 in that it includes the range information shown.

As described above, the above list may include N SS block indexes {# 0, # 1, ..., # N-1} actually transmitted in the serving cell A. Further, the range information indicates the range of M SS block indexes {# 0 to # M-1} including the SS block index of the SS block actually transmitted in at least one of the peripheral cells B to D. The minimum value “0” and the maximum value “M-1” in the range may be included. The range of the SS block index may include a predetermined number of SS block indexes, and the minimum value of the range is not limited to 0.

Further, in FIG. 5, in a part of the measurement period repeated in a predetermined cycle (for example, the second and third measurement periods from the left), in the peripheral cell C, the SS blocks # 0 to # M-1 indicated by the above range information are shown. At least one of the above is transmitted, but the SS blocks # 0 to # M-1 are not transmitted in the peripheral cells B and D. As described above, the range information may include the SS block transmitted in at least one of the peripheral cells B to D.

Based on the list, the user terminal performs measurement using one or more SS blocks {# 0, # 1, ..., # N-1} actually transmitted in the serving cell A within the measurement period. On the other hand, the user terminal blindly detects the SS blocks # 0 to # M-1 indicated by the range information for the peripheral cells B to D, and detects the SS block actually transmitted within the range.

For example, in the peripheral cells B and D of FIG. 5, the SS block is not actually transmitted in a part of the measurement period (for example, the second and third measurement periods from the left) repeated in a predetermined cycle, but the user terminal. Blindly detects SS blocks # 0 to # M-1 indicated by the above range information within the measurement period. Further, in the peripheral cells B to D of FIG. 5, the SS block is transmitted in a part of one measurement period, but the user terminal can limit the range of blind detection based on the above range information.

In the second aspect, the user terminal limits the range of blind detection of the SS block index because the SS block transmission information indicates the SS block actually transmitted in the peripheral cells during at least a part of the measurement period of the predetermined cycle. It is possible to improve the efficiency of measurement in peripheral cells.

Further, when the serving cell and the peripheral cell are synchronized and the user terminal recognizes that the network is synchronized, at least one of the wireless frame timing of the peripheral cell, the slot timing in the wireless frame, the symbol timing, and the like is known. It can be assumed that there is. At this time, the measurement timing in the measurement period can be limited by the SS block index information of the SS block actually transmitted by the peripheral cells included in the SS block transmission information, and the efficiency of the measurement can be improved.

Further, in the second aspect, since the SS block transmission information is shared among a plurality of peripheral cells, the processing load on the network side due to the adjustment between the plurality of peripheral cells and / or the SS block transmission information The increase in overhead associated with signaling can be suppressed.

(Third aspect)
In the third aspect, the user terminal receives SS block transmission information indicating the range of SS blocks transmitted in each group including one or more peripheral cells. The user terminal controls the measurement of peripheral cells for each group based on the SS block transmission information. Hereinafter, the differences from the first and / or second aspects will be mainly described.

In the third aspect, the SS block transmission information is information (range information) indicating the range of the SS block index of the SS block transmitted in each group including one or more peripheral cells in at least a part of the measurement period of a predetermined cycle. ) May be included. For example, the range information of each group may be the minimum value and the maximum value of the SS block index within the range. The minimum value and the maximum value may be different for each group.

Further, the range information of each group may be shared between one or more peripheral cells in the corresponding group. In this case, the SS block within the range indicated by the range information of each group may be transmitted in at least one peripheral cell in the corresponding group.

Further, the SS block transmission information may include a list of SS block indexes actually transmitted in one or more serving cells (first aspect) and range information of each group.

FIG. 6 is a diagram showing an example of control of the measurement according to the third aspect. FIG. 6 is different from FIG. 5 in that the user terminal receives the range information for each group. For example, in FIG. 6, a group 1 including peripheral cells B and C and a group 2 including peripheral cells D are formed.

As described above, the above list may include N SS block indexes {# 0, # 1, ..., # N-1} actually transmitted in the serving cell A. Further, the range information of the group 1 may indicate L SS block indexes {# 0 to # L-1} actually transmitted (possibly) in at least one of the peripheral cells B and C. .. On the other hand, the range information of the group 2 may indicate a predetermined number of SS block indexes {#X to #Y} actually transmitted (possibly) in the peripheral cell D.

Further, in FIG. 6, in a part of the measurement period repeated in a predetermined cycle (for example, the second and third measurement periods from the left), in the peripheral cell C, the SS blocks # 0 to # L indicated by the range information of the group 1 are shown. At least one of -1 is transmitted, but the SS block # 0 to # L-1 is not transmitted in the peripheral cell B. In this way, since the range information for each group is shared within the group, it is sufficient to include the SS block transmitted in at least one of the peripheral cells in the group.

Based on the above list, the user terminal performs measurement using one or more SS blocks {# 0, # 1, ..., # N-1} actually transmitted in the serving cell A within the measurement period. On the other hand, the user terminal blindly detects the SS blocks # 0 to # L-1 indicated by the range information of the group 1 for the peripheral cells B and C, and detects the SS block actually transmitted within the range. Further, the user terminal blindly detects the SS blocks # X to # Y indicated by the range information of the group 2 for the peripheral cell D, and detects the SS block actually transmitted within the range.

In the third aspect, since the SS block transmission information indicates the SS block actually transmitted in the peripheral cells in each group during at least a part of the measurement period of the predetermined cycle, the user terminal blinds the SS block index. The range of detection can be limited and the efficiency of measurement in surrounding cells within each group can be improved.

Further, in the third aspect, since the SS block transmission information is shared among a plurality of peripheral cells in the group, the processing load on the network side due to the adjustment between the plurality of peripheral cells and / or the SS block It is possible to suppress an increase in overhead associated with signaling of transmitted information.

(Fourth aspect)
A fourth aspect describes a case where a plurality of measurement periods having different cycles, timings, and periods are set. The SS block transmission information (eg, the list and / or the range information) described in the first to third aspects may be associated with at least one of the plurality of measurement periods. The user terminal controls the measurement in at least one of the plurality of measurement periods based on the SS block transmission information.

In a fourth aspect, the range information may be associated with all peripheral cells of the same frequency carrier, all peripheral cells listed, or all unlisted. It may be associated with a peripheral cell. Further, the user terminal may receive a plurality of measurement period information used for setting each of the plurality of measurement periods.

FIG. 7 is a diagram showing an example of control of the measurement according to the fourth aspect. FIG. 7 differs from FIGS. 4 to 6 in that a plurality of measurement periods are set in the user terminal. For example, in FIG. 7, the user terminal indicates measurement period information # 1 indicating at least one of the period, timing, and period of measurement period # 1, and measurement indicating at least one of the period, timing, and period of measurement period # 2. Receive period information # 2.

In FIG. 7, the user terminal sets the measurement periods # 1 and # 2, respectively, based on the measurement period information # 1 and # 2. The period, timing and period of measurement period # 1 may be the same as the period, timing and period of the formal SS burst set in serving cell A. Further, the period, timing and period of the measurement period # 2 may be the same as the period, timing and period of the formal SS burst set in the serving cells B to D.

For example, in FIG. 7, the cycle of measurement period # 2 is longer than the cycle of measurement period # 1. Further, the period (time length) of the measurement period # 2 may be shorter than the period of the measurement period # 1.

In FIG. 7, the measurement period # 1 (or measurement period information # 1) and the SS block index {# 0, # 1, ..., # N-1} (or the SS) of the SS block actually transmitted in the serving cell A. A list containing the block index) is associated. As shown in FIG. 7, the measurement period # 1 and the SS block transmitted in the serving cell A may overlap at least a part (the whole period in FIG. 7).

Further, the measurement period # 2 (or the measurement period information # 2) is associated with the range including the SS block actually transmitted in the peripheral cells B to D (or the range information indicating the range). As shown in FIG. 7, at least a part (the entire period in FIG. 7) of the measurement period # 2 and the predetermined period including the SS block transmitted in the peripheral cells B to D may overlap.

As described above, the SS block index associated with the measurement period # 1 includes N SS block indexes {# 0, # 1, ..., # N-1} actually transmitted in the serving cell A. May be good. Further, the user terminal blindly detects the SS blocks # 0 to # M-1 indicated by the range information in the peripheral cells B to D, and detects the SS block actually transmitted within the range. The user terminal may measure the peripheral cells B to D using the detected SS block.

In FIG. 7, since the measurement period # 1 is associated with the SS block index of the SS block actually transmitted in the serving cell A, the measurement load using the SS block transmitted in the serving cell A in the measurement period # 1 is reduced. it can. Further, since the measurement period # 2 is associated with the range including the SS block actually transmitted in at least one of the peripheral cells B to D, the SS block transmitted in the peripheral cells B to D in the measurement period # 2 is associated with the measurement period # 2. The measurement load using is can be reduced.

In the fourth aspect, since a plurality of measurement periods having different cycles, timings, and periods are set, the measurement efficiency by unnecessary blind detection can be achieved by using the measurement period according to the transmission frequency of the SS block. Can be prevented from decreasing.

(Other aspects)
In the second to fourth aspects, the case where the SS block transmission information indicates the range of SS blocks transmitted by one or more peripheral cells has been described, but the SS block transmission information is one or more peripheral cells. It may indicate the SS block transmitted in the cell. Further, the SS block transmission information may be a list of SS block indexes of SS blocks transmitted in one or more peripheral cells in at least a part of the measurement period of a predetermined cycle.

In other embodiments, the list may be associated with all peripheral cells of the same frequency carrier, all peripheral cells listed, or all peripheral cells not listed. May be associated with. When the above list is used, the load of blind detection on the user terminal within the measurement period can be suppressed as compared with the case where the range information is used.

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

FIG. 8 is a diagram showing an example of a schematic configuration of a wireless communication system according to the present embodiment. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) that integrates a plurality of fundamental frequency blocks (component carriers) with the system bandwidth (for example, 20 MHz) of the LTE system as one unit is applied. can do.

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

The radio communication system 1 includes a radio base station 11 that forms a macro cell C1 having a relatively wide coverage, and a radio base station 12 (12a-12c) that is arranged in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. , Is equipped. Further, a user terminal 20 is arranged in the macro cell C1 and each small cell C2.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time by CA or DC. Further, the user terminal 20 may apply CA or DC using a plurality of cells (CCs) (for example, 5 or less CCs and 6 or more CCs). For example, in DC, the MeNB (MCG) applies the LTE cell, and the SeNB (SCG) applies the NR / 5G-cell to perform communication.

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

A wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or a wireless connection is provided between the radio base station 11 and the radio base station 12 (or between the two radio base stations 12). It can be configured to be.

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

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

Each user terminal 20 is a terminal corresponding to various communication methods 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, orthogonal frequency division multiple access (OFDMA) is applied to the downlink as a wireless access method, and single carrier-frequency division multiple access (SC-FDMA) is applied to the uplink. Frequency Division Multiple Access) is applied.

OFDMA is a multi-carrier transmission system that divides a frequency band into a plurality of narrow frequency bands (subcarriers), maps data to each subcarrier, and performs communication. SC-FDMA is a single carrier transmission method that reduces interference between terminals by dividing the system bandwidth into a band consisting of one or a continuous resource block for each terminal and using different bands for multiple terminals. is there. The uplink and downlink wireless access methods are not limited to these combinations, and other wireless access methods may be used.

In the wireless communication system 1, as downlink channels, downlink shared channels (PDSCH: Physical Downlink Shared Channel), broadcast channels (PBCH: Physical Broadcast Channel, NR-PBCH), and downlink L1 / L2 shared by each user terminal 20. A control channel or the like is used. At least one of user data, upper layer control information, and SIB (System Information Block) is transmitted by PDSCH. In addition, MIB (Master Information Block) is transmitted by PBCH. The common control channel that notifies the presence or absence of the paging channel is mapped to the downlink L1 / L2 control channel (for example, PDCCH), and the data of the paging channel (PCH) is mapped to the PDSCH. A downlink reference signal, an uplink reference signal, and a physical downlink synchronization signal are separately arranged.

The downlink L1 / L2 control channel includes 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 the like. Downlink control information (DCI) including scheduling information of PDSCH and PUSCH is transmitted by PDCCH. The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to PUSCH. The EPDCCH is frequency-division-multiplexed with the PDSCH (downlink shared data channel), and is used for transmission of DCI and the like like the PDCCH.

In the wireless communication system 1, as uplink channels, an uplink shared channel (PUSCH: Physical Uplink Shared Channel), an uplink control channel (PUCCH: Physical Uplink Control Channel), and a random access channel (PRACH:) shared by each user terminal 20 are used. Physical Random Access Channel) etc. are used. User data and / or upper layer control information is transmitted by PUSCH. In addition, the PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, and the like. The PRACH transmits a random access preamble for establishing a connection with the cell.

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

<Wireless base station>
FIG. 9 is a diagram showing an example of the overall configuration of the radio base station according to the present embodiment. 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 transmission / reception antenna 101, the amplifier unit 102, and the transmission / reception unit 103 may be configured to include one or more of each.

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

The baseband signal processing unit 104 processes user data in the PDCP (Packet Data Convergence Protocol) layer, divides / combines user data, performs RLC layer transmission processing such as RLC (Radio Link Control) retransmission control, and MAC (Medium Access). Control) Transmission processing such as retransmission control (for example, HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, precoding processing, etc. is performed in the transmission / reception unit. Transferred to 103. Further, the downlink control signal is also subjected to transmission processing such as channel coding and / or inverse fast Fourier transform, and transferred to the transmission / reception unit 103.

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

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

The baseband signal processing unit 104 performs fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing, and error correction for the user data included in the input uplink signal. Decoding, MAC retransmission control reception processing, RLC layer and PDCP layer reception processing are performed, and the data is transferred to the host station apparatus 30 via the transmission path interface 106. The call processing unit 105 performs at least one of call processing such as setting and releasing of a communication channel, state management of the radio base station 10, and management of radio resources.

The transmission line interface 106 transmits and receives signals to and from the host station apparatus 30 via a predetermined interface. Further, the transmission line interface 106 transmits / receives a signal (backhaul signaling) to / from another radio base station 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface). You may.

The transmission / reception unit 103 transmits a synchronization signal (SS) block. Further, the transmission / reception unit 103 transmits SS block transmission information. Further, the transmission / reception unit 103 may transmit one or more measurement period information.

FIG. 10 is a diagram showing an example of the functional configuration of the radio base station according to the present embodiment. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it is assumed that the wireless base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. It should be noted that these configurations may be included in the radio base station 10, and some or all of the configurations may not be included in the baseband signal processing unit 104. The baseband signal processing unit 104 includes a digital beamforming function that provides digital beamforming.

The control unit (scheduler) 301 controls the entire radio base station 10. The control unit 301 can be composed of a controller, a control circuit, or a control device described based on common recognition in the technical field according to the present invention.

The control unit 301 generates, for example, a signal (including a signal corresponding to at least one of a synchronization signal, a MIB, a paging channel, system information, and a broadcast channel) by the transmission signal generation unit 302, assigns a signal by the mapping unit 303, and the like. Control at least one of.

The control unit 301 controls the generation and transmission of the SS block including the synchronization signal and the broadcast channel (NR-PBCH). Further, the control unit 301 controls the generation and / or mapping of the DMRS sequence (DMRS sequence) multiplexed on the symbol for NR-PBCH.

Further, the control unit 301 controls the generation and transmission of SS block transmission information regarding the SS block transmitted by one or more serving cells and / or one or more peripheral cells. The SS block transmission information may indicate an SS block transmitted in the serving cell at least a part of the measurement period of a predetermined cycle (first aspect).

Further, the SS block transmission information may indicate an SS block transmitted by one or more peripheral cells or a range of the SS block in at least a part of the measurement period of a predetermined cycle (second aspect, other aspects). Aspect).

Further, the SS block transmission information may indicate an SS block transmitted in each group including one or more peripheral cells or a range of the SS block in at least a part of the measurement period of a predetermined cycle (third). Aspects, other aspects).

Further, the control unit 301 controls the generation and transmission of the measurement period information indicating the measurement period in the user terminal 20. Further, the control unit 301 may control the generation and transmission of a plurality of measurement period information indicating a plurality of measurement periods having different cycles, timings, and periods (fourth aspect). Further, the SS block transmission information may be associated with at least one of the plurality of measurement periods.

The transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, at least one of SS blocks, etc.) based on an instruction from the control unit 301, and outputs the downlink signal to the mapping unit 303. To do. The transmission signal generation unit 302 can be composed of a signal generator, a signal generation circuit, or a signal generation device described based on common recognition in the technical field according to the present invention.

The transmission signal generation unit 302 generates, for example, a DL assignment for notifying the downlink signal allocation information and a UL grant for notifying the uplink signal allocation information based on an instruction from the control unit 301. Further, the downlink data signal is coded and modulated according to a coding rate, a modulation method, and the like determined based on channel state information (CSI) from each user terminal 20 and the like.

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

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

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

The measuring unit 305 makes a measurement regarding the received signal. The measuring unit 305 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present invention.

The measuring unit 305 uses, for example, the received power of the received signal (for example, RSRP (Reference Signal Received Power)), the reception quality (for example, RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)) and /. Alternatively, it may be measured for the channel state or the like. The measurement result may be output to the control unit 301.

<User terminal>
FIG. 11 is a diagram showing an example of the overall configuration of the user terminal according to the present embodiment. 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 transmission / reception antenna 201, the amplifier unit 202, and the transmission / reception unit 203 may be configured to include one or more of each.

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

The baseband signal processing unit 204 performs at least one of FFT processing, error correction / decoding, retransmission control reception processing, and the like on the input baseband signal. The downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers higher than the physical layer and the MAC layer. In addition, the broadcast information of the downlink data is also transferred to the application unit 205.

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

The transmission / reception unit 203 may further include an analog beamforming unit that performs analog beamforming. The analog beamforming unit includes an analog beamforming circuit (for example, a phase shifter and a phase shift circuit) or an analog beamforming device (for example, a phase shifter) described based on common recognition in the technical field according to the present invention. can do. Further, the transmission / reception antenna 201 can be configured by, for example, an array antenna.

The transmission / reception unit 203 receives the SS block. Further, the transmission / reception unit 203 receives the SS block transmission information. Further, the transmission / reception unit 203 may receive one or more measurement period information. For example, the transmitter / receiver 203 may receive SS block information and / or one or more measurement period information using system information (eg, RMSI) or higher layer signaling (eg, RRC signaling).

FIG. 12 is a diagram showing an example of the functional configuration of the user terminal according to the present embodiment. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it is assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

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

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

The control unit 401 controls, for example, the generation of a signal by the transmission signal generation unit 402 and the allocation of the signal by the mapping unit 403. Further, the control unit 401 controls the signal reception processing by the reception signal processing unit 404 and the signal measurement by the measurement unit 405.

The control unit 401 controls to receive the SS block in a predetermined frequency band or higher. Further, the control unit 401 may control the reception of the synchronization signal block on the assumption that the synchronization signal block is arranged in a predetermined area of the slot.

Further, the control unit 401 controls the measurement of one or more serving cells and / or one or more peripheral cells. Specifically, the control unit 401 may control the measurement of the serving cell in the measurement period of a predetermined cycle based on the SS block transmission information indicating the SS block transmitted by the serving cell (first aspect).

Further, the control unit 401 may control the measurement of the peripheral cells in the measurement period of a predetermined cycle based on the SS block transmitted by one or more peripheral cells or the SS block transmission information indicating the range of the SS blocks. (Second aspect).

Further, the control unit 401 is based on the SS block transmitted in each group including one or more peripheral cells or the SS block transmission information indicating the range of the SS block, and the peripheral cells in each group in the measurement period of a predetermined cycle. Measurement may be controlled (third aspect).

Further, when a plurality of measurement periods having different cycles, timings and periods are set, the control unit 401 may control the measurement in at least one of the plurality of measurement periods. In this case, the SS block transmission information may be associated with at least one of the plurality of measurement periods (fourth aspect).

Further, the control unit 401 may control the setting of one or more measurement periods based on the measurement period information from the radio base station 10. Specifically, the control unit 401 may control the setting of a plurality of measurement periods in which at least one of the period, the timing and the period is different (fourth aspect).

Further, the control unit 401 may control the setting of one or more measurement periods based on the measurement period information. Further, the control unit 401 may control blind detection (detection of the SS block actually transmitted) of one or more serving cells and / or one or more peripheral cells during the measurement period based on the SS block transmission information. Good.

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

The transmission signal generation unit 402 generates an uplink control signal regarding delivery confirmation information and / or channel state information (CSI) based on, for example, an instruction from the control unit 401. Further, the transmission signal generation unit 402 generates an uplink data signal based on an instruction from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate an uplink data signal when the downlink control signal notified from the radio base station 10 includes a UL grant.

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

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

The reception signal processing unit 404 receives the synchronization signal and the broadcast channel transmitted by the radio base station by applying beamforming based on the instruction from the control unit 401. In particular, it receives synchronization signals and broadcast channels that are assigned to at least one of a plurality of time domains (eg, symbols) that make up a given transmission time interval (eg, subframes or slots).

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

The measuring unit 405 performs measurement on the received signal. For example, the measuring unit 405 may measure one or more serving cells and / or one or more peripheral cells by using the SS block transmitted from the radio base station 10. The measuring unit 405 can be composed of a measuring instrument, a measuring circuit, or a measuring device described based on the common recognition in the technical field according to the present invention.

The measuring unit 405 may measure, for example, the received power (for example, RSRP), the reception quality (for example, RSRQ, the received SINR), and / or the channel state using the received SS block. The measurement result may be output to the control unit 401. For example, the measuring unit 405 performs RRM measurement using a synchronization signal.

<Hardware configuration>
The block diagram used in the description of the above embodiment shows a block of functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one physically and / or logically coupled device, or directly and / or indirectly by two or more physically and / or logically separated devices. (For example, wired and / or wireless) may be connected and realized by these a plurality of devices.

For example, the wireless base station, user terminal, and the like in the present embodiment may function as a computer that processes the wireless communication method of the present invention. FIG. 13 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the present embodiment. The radio base station 10 and the user terminal 20 described above may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. Good.

In the following description, the word "device" can be read as a circuit, a device, a unit, or the like. The hardware configuration of the radio base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured not to include some of the devices.

For example, although only one processor 1001 is shown, there may be multiple processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by other methods on one or more processors. The processor 1001 may be mounted on one or more chips.

For each function of the radio base station 10 and the user terminal 20, for example, by loading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an calculation and the communication device 1004 communicates. , It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.

Processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be composed of a central processing unit (CPU) including an interface with a peripheral device, a control device, an arithmetic unit, a register, and the like. For example, the above-mentioned baseband signal processing unit 104 (204), call processing unit 105, and the like may be realized 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 into the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiment 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 is a computer-readable recording medium, such as ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EPROM (Electrically EPROM), RAM (Random Access Memory), or at least other suitable storage medium. It may be composed of one. The memory 1002 may be referred to as a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, or the like that can be executed to carry out the wireless communication method according to the embodiment of the present invention.

The storage 1003 is a computer-readable recording medium, and is, for example, a flexible disk, a floppy (registered trademark) disk, an optical magnetic disk (for example, a compact disc (CD-ROM (Compact Disc ROM)), etc.), a digital versatile disk, At least one of Blu-ray® disks, removable disks, optical disc drives, smart cards, flash memory devices (eg cards, sticks, key drives), magnetic stripes, databases, servers, and other suitable storage media. It may be composed of. The storage 1003 may be referred to as an auxiliary storage device.

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

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that 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, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Further, each device shown in FIG. 13 is connected by a bus 1007 for communicating information. Bus 1007 may be composed of a single bus, or may be composed of different buses between devices.

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

(Modification example)
The terms described herein and / or the terms necessary for understanding the present specification may be replaced with terms having the same or similar meanings. For example, the channel and / or symbol may be a signal (signaling). Also, the signal may be a message. The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot (Pilot), a pilot signal, or the like depending on the applied standard. Further, the component carrier (CC: Component Carrier) may be referred to as a cell, a frequency carrier, a carrier frequency, or the like.

Further, the radio frame may be composed of one or a plurality of periods (frames) in the time domain. Each of the one or more periods (frames) constituting the wireless frame may be referred to as a subframe. Further, the subframe may be composed of one or more slots in the time domain. The subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.

The slot may be composed of one or more symbols in the time domain (OFDM (Orthogonal Frequency Division Multiplexing) symbol, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbol, etc.). In addition, the slot may be a time unit based on numerology. Further, the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain.

Radio frames, subframes, slots, mini-slots and symbols all represent time units when transmitting signals. The radio frame, subframe, slot, minislot and symbol may have different names corresponding to each. 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, and one slot or one minislot may be referred to as a TTI. You may. That is, the subframe and / or TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. There may be.

Here, TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the radio base station schedules each user terminal to allocate radio resources (frequency bandwidth and / or transmission power that can be used in each user terminal, etc.) in TTI units. The definition of TTI is not limited to this. The TTI may be a transmission time unit of a channel-encoded data packet (transport block), or may be a processing unit such as scheduling and / or link adaptation. When one slot or one minislot is called TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (number of mini-slots) constituting the minimum time unit of the scheduling may be controlled.

A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, or the like. TTIs shorter than normal TTIs may also be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, and the like.

A resource block (RB) is a resource allocation unit in a time domain and a frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The RB may also include one or more symbols in the time domain and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI. Each 1TTI and 1 subframe may be composed of one or a plurality of resource blocks. The RB may be referred to as a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, or the like.

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

The above-mentioned structures such as a wireless frame, a subframe, a slot, a minislot, and a symbol are merely examples. For example, the number of subframes contained in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots contained within a slot, the number of symbols contained in a slot or minislot, the number of subcarriers contained in an RB. The number of symbols, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.

Further, the information, parameters, etc. described in the present specification may be represented by an absolute value, a relative value from a predetermined value, or another corresponding information. .. For example, the radio resource may be indicated by a predetermined index. Further, mathematical formulas and the like using these parameters may differ from those expressly disclosed herein.

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

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

Further, information, signals and the like can be output from the upper layer to the lower layer and / or from the lower layer to the upper layer. Information, signals, etc. may be input / 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. Input / output information, signals, etc. can be overwritten, updated, or added. The output information, signals, etc. may be deleted. The input information, signals, etc. may be transmitted to other devices.

Notification of information is not limited to the embodiments / embodiments described herein, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, downlink control information (DCI), uplink control information (UCI)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, etc.). It may be carried out by broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), MAC (Medium Access Control) signaling, other signals, or a combination thereof.

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

In addition, the notification of predetermined information (for example, the notification of "being X") is not limited to the explicit one, but implicitly (for example, by not giving the notification of the predetermined information or another). It may be done (by notification of information).

The determination may be made by a value represented by 1 bit (0 or 1), or by a boolean value represented by true or false. , May be done by numerical comparison (eg, comparison with a given value).

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name, is an instruction, instruction set, code, code segment, program code, program, subprogram, software module. , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted.

Further, software, instructions, information and the like may be transmitted and received via a transmission medium. For example, the software uses wired technology (coaxial cable, fiber optic cable, twist pair, Digital Subscriber Line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) to create a website, server. , Or when transmitted from other remote sources, these wired and / or wireless technologies are included within the definition of transmission medium.

The terms "system" and "network" as used herein are used interchangeably.

In this specification, "Base Station (BS)", "Wireless Base Station", "eNB", "gNB", "Cell", "Sector", "Cell Group", "Carrier" and "Component" The term "carrier" can be used interchangeably. Base stations are sometimes referred to by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.

A base station can accommodate one or more (eg, three) cells (also referred to as sectors). When a base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, each smaller area being a base station subsystem (eg, a small indoor base station (RRH:)). Communication services can also be provided by (Remote Radio Head). The term "cell" or "sector" refers to part or all of the coverage area of a base station and / or base station subsystem that provides communication services in this coverage. Point to.

In the present specification, the terms "mobile station (MS)", "user terminal", "user equipment (UE)" and "terminal" may be used interchangeably. Base stations are sometimes referred to by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmission point, reception point, femtocell, and small cell.

Mobile stations can be subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless, depending on the trader. It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client or some other suitable term.

Further, the radio base station in the present specification may be read by the user terminal. For example, each aspect / embodiment of the present invention may be applied to a configuration in which communication between a radio base station and a user terminal is replaced with communication between a plurality of user terminals (D2D: Device-to-Device). In this case, the user terminal 20 may have the function of the radio base station 10 described above. Further, "up" and / or "down" may be read as "side". For example, the upstream channel may be read as a side channel.

Similarly, the user terminal in the present specification may be read as a radio base station. In this case, the wireless base station 10 may have the functions of the user terminal 20 described above.

In the present specification, the specific operation performed by the base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal are performed by one or more network nodes other than the base station and the base station (for example, the base station). It is clear that it can be performed by MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these) or a combination thereof.

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

Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile). communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM® (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), LTE 802.11 (Wi-Fi®), LTE 802.16 (WiMAX®), LTE 802 It may be applied to systems utilizing .20, UWB (Ultra-WideBand), Bluetooth®, and other suitable wireless communication methods and / or next-generation systems extended based on them.

The phrase "based on" as used herein does not mean "based on" unless otherwise stated. In other words, the statement "based on" means both "based only" and "at least based on".

Any reference to elements using designations such as "first", "second" as used herein does not generally limit the quantity or order of those elements. These designations can be used herein as a convenient way to distinguish between two or more elements. Thus, references to the first and second elements do not mean that only two elements can be adopted or that the first element must somehow precede the second element.

The term "determining" as used herein may include a wide variety of actions. For example, "decision" is calculating, computing, processing, deriving, investigating, looking up (eg, table, database or another data). It may be regarded as "judgment (decision)" of (search in structure), confirmation (ascertaining), and the like. In addition, "judgment (decision)" includes receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access (for example). It may be regarded as "judgment (decision)" such as "accessing" (for example, accessing data in memory). In addition, "judgment (decision)" is regarded as "judgment (decision)" of solving, selecting, selecting, establishing, comparing, and the like. May be good. That is, "judgment (decision)" may be regarded as "judgment (decision)" of some action.

The terms "connected", "coupled", or any variation thereof, as used herein, are any direct or indirect connection between two or more elements or. It means a bond and can include the presence of one or more intermediate elements between two elements that are "connected" or "bonded" to each other. The connection or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are by using one or more wires, cables and / or printed electrical connections, and, as some non-limiting and non-comprehensive examples, radio frequencies. By using electromagnetic energies such as electromagnetic energies with wavelengths in the region, microwave region and light (both visible and invisible) regions, they can be considered to be "connected" or "coupled" to each other.

As used herein or in the claims, "including," "comprising," and variations thereof, these terms are as comprehensive as the term "comprising." Is intended to be. Moreover, the term "or" as used herein or in the claims is intended not to be an exclusive OR.

Although the present invention has been described in detail above, it is clear to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modifications and modifications without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description of the present specification is for the purpose of exemplification and does not have any limiting meaning to the present invention.

Claims (7)

A receiver that receives information indicating a synchronization signal (SS) block for measurement during the measurement period, and a receiver.
A control unit that measures at least one of RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and SINR (Signal to Interference plus Noise Ratio) using the SS block indicated by the information.
Equipped with
When a plurality of measurement periods are set, the information is associated with at least two of the plurality of measurement periods. The terminal according to claim 1, wherein the plurality of measurement periods have at least one of a cycle, a timing, and a period different from each other. The terminal according to claim 1 or 2, wherein the receiving unit receives the information by using upper layer signaling. The terminal according to any one of claims 1 to 3, wherein the SS block is transmitted in a first frequency band or a second frequency band higher than the first frequency band. A transmitter that transmits information indicating a synchronization signal (SS) block for measurement during the measurement period, and a transmitter.
Controls at least one reception of RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and SINR (Signal to Interference plus Noise Ratio) measured using the SS block indicated by the information. Control unit and
Equipped with
When a plurality of measurement periods are set, the information is associated with at least two of the plurality of measurement periods. A wireless communication system having a wireless base station and a terminal.
The radio base station
A transmitter that transmits information indicating a synchronization signal (SS) block for measurement during the measurement period, and a transmitter.
Controls at least one reception of RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and SINR (Signal to Interference plus Noise Ratio) measured using the SS block indicated by the information. Control unit and
Equipped with
The terminal
A receiver that receives the information and
A control unit that measures at least one of RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and SINR (Signal to Interference plus Noise Ratio) using the SS block indicated by the information.
Equipped with
A wireless communication system characterized in that, when a plurality of measurement periods are set, the information is associated with at least two of the plurality of measurement periods. On the terminal
The process of receiving information indicating the synchronization signal (SS) block for measurement during the measurement period, and
A step of measuring at least one of RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), and SINR (Signal to Interference plus Noise Ratio) using the SS block indicated by the information.
Equipped with
A wireless communication method, wherein when a plurality of measurement periods are set, the information is associated with at least two of the plurality of measurement periods.

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