JP2021090228A - Terminal - Google Patents

Abstract

To help inhibit the increase in processing load on an UE even when the communication is controlled based on SS blocks.SOLUTION: A terminal according to one aspect of the invention comprises: a receiving section that receives a synchronization signal block including a synchronization signal and a broadcast channel; and a control section that derives, according to the timing of a serving cell, a synchronization signal block index for the synchronization signal block transmitted by a neighboring cell when information regarding whether or not the neighboring cell synchronizes with the serving cell is communicated from a base station. For the synchronization signal block index, different indices are used for each of synchronization signal blocks in a synchronization signal burst.SELECTED DRAWING: Figure 2

Description

The present invention relates to a terminal in a next-generation mobile communication system.

In the UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) has been specified for the purpose of further high-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) detects a synchronization signal (PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal)) by cell search, and then detects the synchronization signal (PSS (Primary Synchronization Signal), SSS (Secondary Synchronization Signal)). Synchronize with the network (for example, base station (eNB (eNode B))) and identify the cell to be connected (for example, identify by cell ID (Identifier)).

In addition, after the cell search, the UE has system information transmitted on a master information block (MIB: Master Information Block) and a shared data channel (PDSCH: Physical Downlink Shared Channel) transmitted on a broadcast channel (PBCH: Physical Broadcast Channel). It receives a block (SIB: System Information Block) and acquires setting information (which may be called broadcast information, system information, etc.) for communication with the 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 (for example, NR), it is considered to define a resource unit including a synchronization signal and a broadcast channel as an SS block (Synchronization Signal block) and perform initial connection based on the SS block.

It is also being considered to perform measurements based on SS blocks for cells other than serving cells. In this case, it is preferable to identify and report which SS block of another cell was measured. However, in order to identify the SS block of another cell, there is a problem that the load on the UE increases.

Therefore, one of the objects of the present invention is to provide a terminal capable of suppressing an increase in the processing load of the UE even when performing communication control based on the SS block.

The terminal according to one aspect of the present invention is said to be described when the base station notifies a receiving unit that receives a synchronization signal block including a synchronization signal and a broadcast channel and information on whether or not an adjacent cell is synchronized with a serving cell. Based on the timing of the serving cell, the synchronization signal block index of the synchronization signal block transmitted by the adjacent cell is derived. Here, the synchronization signal block index has a different index for each synchronization signal block in the synchronization signal burst. It has a control unit and is used.

According to the present invention, it is possible to suppress an increase in the processing load of the UE even when communication control is performed based on the SS block.

FIG. 1 is a conceptual explanatory diagram of the SS block. FIG. 2 is a diagram showing a specific example of the SS block in the case of synchronous NW. FIG. 3 is a diagram showing a specific example of the SS block in the second embodiment. FIG. 4 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. FIG. 5 is a diagram showing an example of the overall configuration of the radio base station according to the embodiment of the present invention. FIG. 6 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment of the present invention. FIG. 7 is a diagram showing an example of the overall configuration of the user terminal according to the embodiment of the present invention. FIG. 8 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment of the present invention. FIG. 9 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the embodiment of the present invention.

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 a synchronization signal and a broadcast channel is defined as an SS block (Synchronization Signal block). , It is being considered to make an initial connection based on the SS block.

The SS block will be described with reference to FIG. FIG. 1 is a conceptual explanatory diagram of the SS block. The SS block shown in FIG. 1 can be used for the same purposes as the PSS, SSS and PBCH of the existing LTE system, for NR PSS (NR-PSS), for NR SSS (NR-SSS) and for NR. It contains at least PBCH (NR-PBCH). A synchronization signal (TSS: Tertiary SS) different from PSS and SSS may be included in the SS block.

The set of one or more SS blocks may be referred to as an SS burst. In this example, the SS burst is composed of a plurality of SS blocks that are continuous in time, but is not limited to this. For example, 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 is preferably transmitted at predetermined cycles (which may be referred to as SS burst cycles). Alternatively, the SS burst may not be transmitted every cycle (it may be transmitted aperiodically). The SS burst length and / or SS burst period may be transmitted over a period of one or more subframes, one or more slots, and the like.

Further, one or more SS bursts may be referred to as an SS burst set (SS burst series). For example, a base station (BS (Base Station), transmission / reception point (TRP), eNB (eNode B), gNB, etc.) and / or UE are included in one SS burst set. Multiple SS blocks may be beam sweeped and transmitted using one or more SS bursts.

The SS burst set is preferably transmitted periodically. The UE may control the reception process assuming that the SS burst set is transmitted periodically (in the SS burst set period).

NR-PSS and NR-SSS, or NR-PSS (NR-SSS) and NR-PBCH may be time division multiplexing (TDM) or frequency division multiplexing (FDM). You may.

In NR, the following initial access procedure using SS block is being considered. First, the UE detects NR-PSS (step S101). The UE roughly synchronizes the time and frequency based on step S101 and identifies the scrambled ID (which may be referred to as the local ID) of the NR-SSS transmitted in the NR cell (cell supporting NR).

Next, the UE detects NR-SSS (step S102). The relative resource locations of NR-PSS and NR-SSS are specified in the specification. After the completion of step S102, the UE can identify the cell ID.

The UE detects and decodes the NR-PBCH (step S103). The relative resource position of the NR-PBCH with respect to the NR-SSS (or NR-PSS) is specified in the specification. In addition, the UE can perform channel estimation for decoding the NR-PBCH based on a predetermined reference signal (for example, a demodulation reference signal (DMRS)).

The NR-SSS and NR-PBCH detected in steps S102 and S103 correspond to the same SS block index as NR-PSS, respectively.

The UE is a downlink control channel (for example, a control channel for NR (NR-PDCCH (Physical)) required to receive the minimum system information (for example, may be called RMSI (Remaining Minimum System Information)). Downlink Control Channel))) is detected and decoded (step S104). The UE determines the configuration information of the NR-PDSCH that transmits the RMSI based on the NR-PDCCH.

The UE can monitor a predetermined control resource set to detect the NR-PDCCH. The control resource set is a resource set that is a transmission candidate for the downlink control channel (NR-PDCCH), and is a control resource set (CORSET: COntrol Resource SET), a control subband, and a control channel search space. , Search space set, search space resource set, control area, control subband, NR-PDCCH area, and the like. In the case of the present specification, the control resource set mainly assumes the control resource set required for receiving the RMSI, but is not limited thereto.

The UE decodes the NR-PDSCH and acquires the RMSI based on the configuration information of the NR-PDSCH determined in step S104 (step S105). The UE determines at least a random access channel configuration (RACH (Random Access Channel) configuration) based on the RMSI.

The UE performs a random access procedure based on the RACH settings (step S106).

In NR, the operation of a system using a single beam or a multi-beam is being studied. For example, in the case of multi-beam operation, it is conceivable to beam sweep a plurality of SS blocks and periodically and repeatedly transmit the entire SS burst set. Further, NR-PSS, NR-SSS and NR-PBCH corresponding to the same SS block index may be transmitted by the same beam.

By the way, in NR, it is considered that the UE performs not only the measurement of the cell level but also the measurement of the SS block level. As the measurement of the SS block level, for example, RSRP measurement of the SS block and RSRP measurement of CSI-RS in the connection mode are assumed. RSRP (SS block RSRP) of SS block is considered to be measured based on NR-SSS (and DMRS for PBCH demodulation). In the case of CSI-RS measurement, it is necessary to confirm the presence or absence of a cell and secure the timing, and it is considered to acquire the cell timing information from the SS block.

The timing information of the SS block may be called, for example, the time index of the SS block. The SS block time index is represented by, for example, the SS burst set index, the SS burst index (in the SS burst set), the SS block index, the symbol index, the slot index, the system frame number, or any combination thereof. May be good.

For example, as the SS block index, the same index may be used between SS bursts in the SS burst set, or a different index may be used for each SS block in the SS burst set.

Further, in NR, measurement of not only the serving cell but also other cells (for example, adjacent cells) of the serving cell is being studied. As described above, RSRP measurement at the SS block level is required even in other cells.

By the way, when reporting the RSRP measurement result of the SS block from the UE to the network, it is conceivable to include information that can identify the SS block (for example, the SS block index) in the report. By identifying the SS block corresponding to the report, the network can determine, for example, which beam quality is good from the viewpoint of the UE, and can control the beam switching smoothly.

Further, by associating the SS block index with the information that identifies CSI-RS (for example, CSI-RS ID), effective utilization is possible. For example, the network assigns CSI-RS to all cells. The network specifies (limits) the CSI-RS to be measured for each UE based on the SS block RSRP and SS block index reported by the UE. According to this configuration, the UE only needs to perform the designated CSI-RS measurement, so that the burden can be reduced.

Thus, it turns out that the SS block index transmitted using the NR-PBCH is useful information for the network and the UE.

However, when acquiring the SS block index from the NR-PBCH included in the SS block of another cell in the UE, it is necessary to decode the NR-PBCH from each SS block for all the other cells, so that the processing in the UE There is a problem of increased delay and burden.

Therefore, the present inventors have studied a method capable of suppressing a decrease in communication throughput even when performing communication control based on the SS block, and have reached the present invention.

The user terminal of one aspect of the present invention receives one or more synchronization signal blocks (referred to as SS blocks) including a synchronization signal and a broadcast channel (referred to as PBCH) from at least a serving cell, and based on predetermined information, another. It is determined whether or not to decode the PBCH contained in the SS block of the cell.

According to one aspect of the present invention, since it is determined whether or not to decode the PBCH contained in the SS block of another cell based on predetermined information, there may be a case where it is not necessary to decode the PBCH of the SS block. .. In this way, decoding of the PBCH can be eliminated according to predetermined information, and even when communication control based on the SS block is performed, an increase in the processing load of the UE can be suppressed.

In the above aspect, the predetermined information may be an instruction as to whether or not to decode the PBCH contained in the SS block of another cell. For example, the network notifies the UE whether or not it is necessary to read the SS block of another cell. Alternatively, the specifications may predefine the conditions under which the UE does not have to read the SS block of another cell. A notification indicating whether or not the SS block of another cell does not have to be read, and a condition that the SS block of another cell specified in the specification does not have to be read can be used as an instruction as to whether or not to decode the PBCH.

In the above aspect, the UE can use information as predetermined information regarding whether or not the other cell to be measured is synchronized with the serving cell. The information may be information that explicitly indicates whether or not the peripheral cells of the frequency to be measured are synchronized with the serving cell, or is another setting information that binds to whether or not the cells are synchronized. May be good. If it is known that the other cell is synchronized with the serving cell in the UE, if the synchronization signal of the SS block of the other cell can be detected, the PBCH is demodulated and the timing information (for example, time index) of the SS block is not read. Can also know the boundaries of frames and slots of other cells.

In the above aspect, the UE can use the information regarding whether or not the other cell to be measured applies the single beam operation as predetermined information. The information may be information that explicitly indicates whether or not the single beam operation is applied, or may be other setting information that is tied to whether or not the single beam operation is applied. If it is known in the UE that another cell is applying single beam operation, if the UE can detect the synchronization signal of the SS block from the other cell, the SS block is the only SS block in the cell, so PBCH. The index of the SS block in the other cell can be specified from known information (for example, RRC signaling) without reading the SS block index from.

In the above embodiment, when the PBCH contained in the SS block of the other cell is not decoded, the detection timing of the SS block in the other cell may be specified based on the predetermined timing of the serving cell. For example, if the UE detects an SS block based on a synchronization signal included in the SS block of another cell (however, PBCH is not decoded), the detection timing of the SS block of the other cell is offset by a time offset with respect to a predetermined timing of the serving cell. Identify as. The UE may notify the network of the time offset as information in place of the SS block timing information (for example, SS block time index) detected in another cell. The network can recognize which SS block the UE has detected from the time offset with respect to the SS block notified by the UE.

In the above embodiment, when the UE does not decode the PBCH contained in the SS block of the other cell, at least one of the indexes for identifying the SS block of the other cell is reported in the measurement report using the SS block of the other cell. Control is performed without including the part. The UE can also include an index for identifying the SS block of the serving cell in the measurement report using the SS block only for the serving cell.

In the above aspect, when the UE determines whether or not to decode the PBCH contained in the SS block of the other cell based on the predetermined information, the UE decodes the PBCH contained in the SS block of the other cell. An RRM requirement (Radio Resource Measurement requirement) different from the case where the PBCH contained in the SS block is not decoded may be applied to the measurement of another cell (including the measurement of the SS block level).

For example, when decoding the PBCH contained in the SS block of another cell, a relaxed RRM request can be applied with respect to the measurement of the other cell as compared with the case where the PBCH is not decoded. The RRM request can include at least one request for measurement delay, a side condition of SINR (Signal to Interference plus Noise Ratio), and at least one of the number of cells to be reported. According to this configuration, the load on the UE that decodes the PBCH included in the SS block of another cell can be reduced.

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

In the following embodiments, the prefix of "NR-" relating to signals and channels may be omitted.

(Wireless communication method)
<First Embodiment>
In the first embodiment, the UE determines whether or not to decode the PBCH contained in the SS block of another cell based on the predetermined information. Here, the "predetermined information" used by the UE to determine whether or not to decode the PBCH included in the SS block of another cell is higher layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium). UE using Access Control) signaling (eg, MAC CE (Control Element), broadcast information, etc.), physical layer signaling (eg, Downlink Control Information (DCI)) or a combination thereof. It may be notified (set) to, or it may be specified in the specifications.

For example, the UE may be explicitly instructed not to decode the PBCH contained in the SS block of another cell using RRC signaling or SIB notified from the network (when not instructed to decode the PBCH). including). When the UE is instructed not to decode the PBCH contained in the SS block of another cell using RRC signaling or SIB, the SS block is based on the synchronization signal (PSS, SSS) contained in the SS block of the other cell. Is detected, but the PBCH contained in the SS block is not decoded.

Even when the PBCH included in the SS block of another cell is not decoded, the UE can acquire the information for identifying the SS block of the other cell if the other cell to be measured is synchronized with the serving cell.

FIG. 2 is a diagram showing a specific example of the SS block in the case of synchronous NW. This example shows the time resource of the SS block in which other cells are synchronized with the serving cell. The serving cell and another cell (for example, adjacent cells of the serving cell) # 0, # 1, and # 2 are synchronized, and the beginning of a predetermined SS burst set cycle coincides between the cells.

In the serving cell, a plurality of SS bursts are transmitted within the SS burst set cycle, and one SS burst contains five SS blocks. The other cell # 0 has the same SS burst set period as the serving cell, and one SS burst contains four SS blocks. The other cell # 1 has a longer (eg, double) SS burst set period than the serving cell, and the other cell # 2 has a shorter (eg, half) SS burst set period than the serving cell. ..

A case where the UE detects an SS block in another cell # 0 under the cell synchronization situation shown in FIG. 2 will be described as an example. It is assumed that the UE detects the synchronization signal of the first SS block (SS # 1) among the four SS blocks included in the SS burst in the other cell # 0 and detects the first SS block. Decoding the PBCH included in the first SS block (SS # 1) reveals the time index of the SS block (SS # 1), but in this example, the PBCH is not decoded and the SS block (SS # 1) Identify timing information (corresponding to the SS block time index).

For example, the UE determines which frame, slot, and / or symbol timing in the serving cell the detection timing of the first SS block (SS # 1) coincides with. If it is found which frame, slot and / or symbol timing in the serving cell the first SS block (SS # 1) in the other cell # 0 matches, the first SS block (SS # 1) is the other cell #. It is possible to grasp which frame, slot and / or symbol timing at 0 corresponds to.

In this way, the frame, slot, and / or symbol timing in the other cell # 0 is determined with respect to the first SS block (SS # 1) in the other cell # 0. Therefore, the UE can know the timing of the detected SS block in the other cell # 0 without reading the time index from the PBCH of the first SS block (SS # 1) in the other cell # 0, and can know the timing of the detected SS block in the other cell # 0. You can know the boundaries of frames and slots.

As shown in FIG. 2, the other cells # 1 and # 2 are cells having different SS burst set periods from the serving cell. Similar to the other cell # 0, the frame, slot and / or symbol timing in the other cells # 1 and # 2 can be specified for the detected SS block. For example, in another cell # 1, the UE detects the synchronization signal of the second SS block (SS # 2) among the plurality of SS blocks included in the SS burst, and detects the second SS block (SS # 2). And.

The UE identifies which frame, slot, and / or symbol timing in the serving cell the detection timing of the second SS block (SS # 2) of interest corresponds to. The SS burst set period of the other cell # 1 is longer than that of the serving cell, but since the UE knows the frame, slot, and / or symbol timing of the serving cell, the timing of the SS block detected in the other cell # 1 is the same as described above. Can be identified.

Then, the UE specifies which frame, slot, and / or symbol timing corresponding to the detection SS block in the serving cell corresponds to which frame, slot, and / or symbol timing in the original other cell # 1. In this way, it is determined which frame, slot, and / or symbol timing in the other cell # 1 corresponds to the second SS block (SS # 2) to be measured in the other cell # 1.

When the UE performs RRM measurement (for example, RSRP measurement) using the SS block in another cell, in addition to the RRM measurement result, the timing information of the SS block in the other cell (timing information based on the serving cell) and / Alternatively, a measurement report including the SS block index (information derived based on the timing of the serving cell) may be transmitted to the network.

The network can identify the SS block from the timing information and / or index information of the SS block included in the report, can determine which beam quality is good in the UE, and appropriately perform beam control (for example, handover). )it can.

If the other cell to be measured applies the single beam operation (single beam operation), the UE can identify the SS block in the other cell without decoding the PBCH included in the SS block of the other cell. When a single beam operation is applied to another cell, SS blocks having the same SS block index are repeatedly transmitted in the other cell in the SS burst set cycle. Therefore, if the synchronization signal of the SS block is detected in the other cell, it can be assumed that the detected SS block is an SS block having the same SS block index that is repeatedly transmitted in the other cell.

If the SS block is detected in the other cell in the situation where the single beam operation is applied to the other cell, the UE is the only SS block in the other cell, so that the UE does not decode the PBCH. The SS block can be identified. For example, it is treated as if an SS block having a predetermined SS block index (for example, index # 0) is detected. Alternatively, it is not necessary to specify the SS block index for the detected SS block.

Information about the SS block used in the cell to which the single beam operation is applied (for example, SS block index) may be specified in the specification, or may be specified by the upper layer signaling (for example, RRC signaling) to the UE. You may be notified.

When the UE performs RRM measurement using the SS block in another cell, the UE may send a measurement report including a predetermined SS block index (for example, index # 0) to the network in addition to the RRM measurement result. Good.

If the UE does not specify the SS block index of the SS block of another cell, the UE may not include the SS block index in the report. For example, the UE may send a report containing the cell ID and RRM measurement results to the network.

The network receives the RRM measurement result of the SS block of the other cell from the UE in the situation where the other cell to be measured applies the single beam operation. In this case, since the network knows the SS block index used in each cell, even a report that does not include the SS block index can recognize the SS block and move to the subsequent processing.

<Second embodiment>
In the second embodiment, different RRM requirements are applied depending on whether the NR-PBCH contained in the SS block of another cell is decoded or the NR-PBCH is not decoded. As the RRM requirement (Radio Resource Measurement requirement), for example, at least one of SINR's side condition, measurement time, accuracy, and number of measurement signals may be specified.

As an incidental condition of SINR, a lower limit of SINR at the cell level to be detected may be specified. As the measurement time, the maximum delay time with respect to the measurement delay may be specified. As the number of measurement signals, the number of cells of the measurement result to be reported to the network, the maximum number of cells, and the like may be specified.

For example, when the UE decodes the NR-PBCH of the SS block as a result of determining whether or not to decode the NR-PBCH contained in the SS block of another cell based on the predetermined information, the UE determines the NR-PBCH of the SS block. A relaxed RRM requirement is applied as compared to the case where the PBCH is not decoded.

As an example, it is assumed that the UE performs measurement (for example, RRM measurement) on the inactive SCC and reports the measurement result to the network. The network may control the SCC setting state (active state or inactive state) or the like based on the measurement result or the like reported by the UE.

When the UE decodes the NR-PBCH contained in the SS block of another cell, at least one of the requirement for measurement delay, the side condition of SINR, and the number of cells to be reported may be relaxed. For example, the UE may report the measurement result of a smaller number of cells when decoding the NR-PBCH of the SS block of another cell than when not decoding the NR-PBCH.

According to the second embodiment, when decoding the NR-PBCH of the SS block, the UE can apply a relaxed RRM request as compared with the case of not decoding the NR-PBCH of the SS block. It is possible to suppress an increase in the load on the UE when performing communication control based on the above.

In the above aspect, the UE decodes the PBCH contained in the SS block of another cell, reads the time index, and reports the time index to the network. In another aspect, the UE may report the index corresponding to the SS block time index to the network without reading the time index from the PBCH of the SS block.

Specifically, when the UE detects the SS block of the other cell based on the synchronization signal of the SS block of the other cell, the detection timing of the SS block is determined by the serving cell without decoding the PBCH of the SS block. Detects the time offset from the timing of. In addition, the UE reports the detected time offset (which may be called a time index) to the network as an index corresponding to the SS block time index.

FIG. 3 is a diagram showing a specific example of the SS block in the second embodiment. In this example, as the detection timing of the SS block of another cell, the index indicated by the time offset from the predetermined timing of the serving cell is reported. In FIG. 3, the serving cell and the other cell # 0 are in an asynchronous state. The serving cell and the other cell # 0 may be synchronized.

In the serving cell, a plurality of SS burst sets are arranged in the SS burst set cycle, and five SS blocks are transmitted in one SS burst set. On the other hand, the other cell # 0 is asynchronous with respect to the serving cell, and the number of SS blocks constituting one SS burst set is different from that of the serving cell. Then, a time index (# 0, ..., # N, ...) Is defined with reference to a predetermined timing of the serving cell.

In the example shown in FIG. 3, the time index is determined based on the start timing of the SS burst set cycle in the serving cell. Specifically, in another cell # 0, the first SS block of a certain SS burst set cycle corresponds to the time index # n. The SS block in the latter half of the SS burst set cycle in the other cell # 0 corresponds to the first half of the SS burst set cycle in the serving cell. Therefore, the time index also switches to the younger number when it reaches the beginning of the SS burst set cycle in the serving cell.

The UE receives the SS block in the SS burst set cycle in the other cell # 0, and detects the SS block based on the synchronization signal included in the SS block. For example, the UE measures RSRP in SS block units and reports the RSRP measurement result in SS block units to the network.

When reporting the RSRP measurement result of the detected SS block to the network, the time index based on the predetermined timing of the serving cell is used instead of reading the time index from the PBCH of the SS block. For example, when the SS block at the beginning of the SS burst set cycle is detected in another cell # 0, the time index # n based on the serving cell is reported.

In this way, when each SS block is detected in other cell # 0, the time index based on the serving cell is reported, so that the network can use the SS block time index detected from the PBCH without increasing the load on the UE. You can receive equivalent information.

When a plurality of SS blocks are detected in other cells, the time indexes related to these plurality of SS blocks may be reported to the network respectively. In this case, it is preferable that the measured results of each detected SS block are notified of individual measured values without averaging.

<Third embodiment>
The third embodiment is an example in which the time index is not always read from the PBCH for the SS block of another cell regardless of the predetermined information. The third embodiment does not require an SS block index to identify individual SS blocks for reporting cell measurement results in other cells.

When the UE does not decode the PBCH contained in the SS block of another cell, the measurement report using the SS block of the other cell does not include at least a part of the index for identifying the SS block of the other cell. Do. For the serving cell, the UE may also include the SS block index for identifying the SS block of the serving cell in the measurement report using the SS block.

For example, the UE assumes that the serving cell is required to have the RSRP measurement result and SS block index in SS block units, while the other cells are not required to have the RSRP measurement result and SS block index in SS block units. May be good.

When a plurality of SS blocks of other cells are detected in the UE, if those SS blocks have the same cell ID, the cell level RSRP related to the cell ID may be reported. Alternatively, when a plurality of SS blocks of other cells are detected in the UE, if those SS blocks have the same cell ID, the upper N SS block level RSRPs among the RSRPs in SS block units may be reported.

The UE combines these two aspects and reports one cell level RSRP for one cell ID together with the cell ID, and reports the top N SS block level RSRPs of the SS block unit RSRPs without the SS block index. You may report.

In the third embodiment, the SS block index that can be read from the PBCH of the SS block is not required, but the information obtained in the process before decoding the PBCH of the SS block may be reported. For example, when the SS block index is implicitly expressed, it is assumed that some information for identifying the SS block can be obtained in the process before decoding the PBCH of the SS block.

Further, in order to identify the SS block by the sequence, time and / or frequency resource, scramble ID, etc. of the signal (PSS / SSS / PBCH) and / or the predetermined signal (for example, the predetermined reference signal) included in the SS block. Some information may be obtained.

For example, if the SS burst index is implicitly used to indicate the time index of an SS block, then if the SS burst index can be obtained without decoding the PBCH, then the SS burst index is networked with the SS block level RSRP. You may report to.

According to the third embodiment described above, for example, the UE attaches an SS block index to the SS block level measurement result for the serving cell and reports it, but does not report the SS block level measurement result for the other cells. Or, since the upper N SS block level RSRPs can be reported for one cell ID, the burden of decoding the PBCH of another cell in the UE can be reduced.

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

FIG. 4 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment of the present invention. 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. (5th generation mobile communication system), NR (New Radio), FRA (Future Radio Access), New-RAT (Radio Access Technology), etc., or a system that realizes these may be called.

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 arrangement, number, and the like of each cell and the user terminal 20 are not limited to the mode shown in the figure.

The user terminal 20 can be connected to both the radio base station 11 and the radio base station 12. It is assumed that the user terminal 20 uses the macro cell C1 and the small cell C2 at the same time by using 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).

Communication can be performed between the user terminal 20 and the radio base station 11 using a carrier (also referred to as an existing carrier or a legacy carrier) 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.

Further, the user terminal 20 can perform communication in each cell using Time Division Duplex (TDD) and / or Frequency Division Duplex (FDD). Further, in each cell (carrier), a single numerology may be applied, or a plurality of different numerologies may be applied.

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

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) and / or OFDMA applies.

OFDMA is a multi-carrier transmission system in which a frequency band is divided into a plurality of narrow frequency bands (subcarriers), data is mapped to each subcarrier, and communication is performed. SC-FDMA is a single carrier transmission that reduces interference between terminals by dividing the system bandwidth into a band composed of one or a continuous resource block for each terminal and using different bands for a plurality of terminals. It is a method. 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), downlink L1 / L2 control channels, etc. shared by each user terminal 20 are used. Used. User data, upper layer control information, SIB (System Information Block), etc. are transmitted by PDSCH. In addition, MIB (Master Information Block) is transmitted by PBCH.

The downlink L1 / L2 control channel includes PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid-ARQ Indicator Channel) and the like. Downlink control information (DCI) including scheduling information of PDSCH and / or PUSCH is transmitted by PDCCH.

Scheduling information may be notified by DCI. For example, a DCI that schedules DL data reception may be referred to as a DL assignment, and a DCI that schedules UL data transmission may be referred to as a UL grant.

The number of OFDM symbols used for PDCCH is transmitted by PCFICH. The PHICH transmits HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information (for example, retransmission control information, HARQ-ACK, ACK / NACK, etc.) to 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, upper layer control information, and the like are transmitted by PUSCH. In addition, the PUCCH transmits downlink radio quality information (CQI: Channel Quality Indicator), delivery confirmation information, scheduling request (SR: Scheduling Request), and the like. The PRACH transmits a random access preamble to establish 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. 5 is a diagram showing an example of the overall configuration of the radio base station according to the embodiment of the present invention. The radio base station 10 includes a plurality of transmission / reception antennas 101, an amplifier unit 102, a transmission / reception unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission line interface 106. The 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 by 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 a 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 inverse fast Fourier transform, and is transferred to the transmission / reception unit 103.

The transmission / reception unit 103 converts the baseband signal output by precoding for each antenna from the baseband signal processing unit 104 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 call processing (setting, release, etc.) of the communication channel, status management of the radio base station 10, management of radio resources, and the like.

The transmission line interface 106 transmits and receives signals to and from the 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 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. You may. Further, the transmission / reception antenna 101 may be configured by, for example, an array antenna.

The transmission / reception unit 103 may transmit a signal using a transmission beam, or may receive a signal using a reception beam. The transmission / reception unit 103 may transmit and / or receive a signal using a predetermined beam determined by the control unit 301.

The transmission / reception unit 103 transmits one or more synchronization signal blocks (SS blocks) including a synchronization signal (for example, NR-PSS, NR-SSS, etc.) and a broadcast channel (for example, NR-PBCH). The transmission / reception unit 103 may transmit NR-PBCH having the same content and / or configuration using a plurality of different SS blocks.

The transmission / reception unit 103 indicates whether or not to decode the PBCH included in the SS block of the other cell, information on whether or not the other cell to be measured is synchronized with the serving cell, and the other cell to be measured performs a single beam operation. Information regarding whether or not the above is applied may be transmitted to the user terminal 20.

The transmission / reception unit 103 may receive a cell-level and / or SS block-level measurement report from the user terminal 20.

FIG. 6 is a diagram showing an example of a functional configuration of a radio base station according to an embodiment of the present invention. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the wireless base station 10 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 104 includes at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. 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 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 controls, for example, the generation of signals in the transmission signal generation unit 302, the allocation of signals in the mapping unit 303, and the like. Further, the control unit 301 controls the signal reception processing in the reception signal processing unit 304, the measurement of the signal in the measurement unit 305, and the like.

The control unit 301 schedules system information, downlink data signals (for example, signals transmitted by PDSCH), downlink control signals (for example, signals transmitted by PDCCH and / or EPDCCH, delivery confirmation information, etc.) (for example, resources). Allocation) is controlled. Further, the control unit 301 controls the generation of the downlink control signal, the downlink data signal, and the like based on the result of determining the necessity of the retransmission control for the uplink data signal. Further, the control unit 301 controls scheduling of synchronization signals (for example, PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and downlink reference signals (for example, CRS, CSI-RS, DMRS).

Further, the control unit 301 uses an uplink data signal (for example, a signal transmitted by PUSCH), an uplink control signal (for example, a signal transmitted by PUCCH and / or PUSCH; delivery confirmation information, etc.), and a random access preamble (for example, a signal transmitted by PUSCH). It controls the scheduling of (signals transmitted by PRACH), uplink reference signals, and the like.

The control unit 301 uses the digital BF (for example, precoding) in the baseband signal processing unit 104 and / or the analog BF (for example, phase rotation) in the transmission / reception unit 103 to form a transmission beam and / or a reception beam. May be done. The control unit 301 may perform control to form a beam based on the downlink propagation path information, the uplink propagation path information, and the like. These propagation path information may be acquired from the received signal processing unit 304 and / or the measuring unit 305.

The control unit 301 may explicitly instruct the user terminal 20 not to decode the PBCH contained in the SS block of another cell by using RRC signaling or SIB.

Further, the control unit 301 sets the SS block so that a predetermined SS burst set (see FIG. 1) is realized for each of the serving cell and the other cells. A synchronization signal and PBCH are scheduled for each SS block. For example, as shown in FIG. 2, the transmission / reception timing of each cell may be controlled so that the serving cell and the other cells # 0, # 1, and # 2 are synchronized.

Further, the control unit 301 may receive a report of measurement results (for example, cell level measurement result, SS block level measurement result) in the serving cell and other cells from the user terminal 20.

For example, the control unit 301 can measure the RSRP measurement result in the other cell to be measured and the timing information of the SS block in the other cell (timing based on the serving cell) in a situation where the other cell to be measured is synchronized with the serving cell. Information) may be received. In this case, the SS block of the RSRP measurement result reported from the timing information of the SS block is specified. The control unit 301 may determine which beam quality is good in the user terminal 20 based on the received measurement result, and perform control to change the beam or the like.

Further, the control unit 301 may receive the RSRP measurement result of the SS block in the other cell from the user terminal 20 in the situation where the other cell to be measured applies the single beam operation. In this case, the control unit 301 can identify the SS block because it knows that the other cell is a single beam even in the report to which the SS block index is not assigned.

Further, the control unit 301 may assume different RRM requests for measurement in the other cell depending on whether the user terminal 20 decodes the PBCH included in the SS block of the other cell and the case where the PBCH is not decoded. For example, when the PBCH included in the SS block of another cell is decoded in the user terminal 20, at least one of the SINR side condition, the measurement time, the accuracy, and the number of measurement signals is relaxed in the control unit 301. You may assume that it was.

Further, when the user terminal 20 detects each SS block in another cell and reports the time index based on the serving cell, the control unit 301 detects the SS block in the other cell based on the time index. The SS block may be specified.

Further, when the user terminal 20 reports the information obtained in the process before decoding the PBCH of the SS block, the control unit 301 identifies the SS block detected by the user terminal 20 in another cell from the information. May be good.

The transmission signal generation unit 302 generates a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) based on an instruction from the control unit 301, and outputs the downlink signal to the mapping unit 303. 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 data allocation information and / or a UL grant for notifying the uplink data allocation information based on an instruction from the control unit 301. Both DL Assignments and UL Grants are DCIs and follow the corresponding DCI formats. 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 / or the signal after the reception processing to the measurement unit 305.

The measuring unit 305 performs measurement on 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.

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

(User terminal)
FIG. 7 is a diagram showing an example of the overall configuration of the user terminal according to the embodiment of the present invention. The user terminal 20 includes a plurality of transmission / reception antennas 201, an amplifier unit 202, a transmission / reception unit 203, a baseband signal processing unit 204, and an application unit 205. The 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 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. Further, among the downlink data, the broadcast information may also be 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. You may. Further, the transmission / reception antenna 201 may be configured by, for example, an array antenna.

The transmission / reception unit 203 may transmit a signal using a transmission beam or may receive a signal using a reception beam. The transmission / reception unit 203 may transmit and / or receive a signal using a predetermined beam determined by the control unit 401.

The transmission / reception unit 203 receives one or more synchronization signal blocks (SS blocks) including a synchronization signal (for example, NR-PSS, NR-SSS, etc.) and a broadcast channel (for example, NR-PBCH).

The transmission / reception unit 203 instructs whether to decode the PBCH included in the SS block of the other cell, information on whether the other cell to be measured is synchronized with the serving cell, and the other cell to be measured performs a single beam operation. Information regarding whether or not the above is applied may be received from the radio base station 10.

The transmission / reception unit 203 may transmit a cell level and / or SS block level measurement report to the radio base station 10.

FIG. 8 is a diagram showing an example of a functional configuration of a user terminal according to an embodiment of the present invention. In this example, the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication.

The baseband signal processing unit 204 included in the user terminal 20 includes at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. 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, signal generation in the transmission signal generation unit 402, signal allocation in the mapping unit 403, and the like. Further, the control unit 401 controls the signal reception processing in the reception signal processing unit 404, the signal measurement in the measurement unit 405, and the like.

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

The control unit 401 controls to form a transmission beam and / or a reception beam by using the digital BF (for example, precoding) in the baseband signal processing unit 204 and / or the analog BF (for example, phase rotation) in the transmission / reception unit 203. May be done. The control unit 401 may perform control to form a beam based on the downlink propagation path information, the uplink propagation path information, and the like. These propagation path information may be acquired from the received signal processing unit 404 and / or the measuring unit 405.

Whether the control unit 401 receives one or more SS blocks including the synchronization signal and the broadcast channel (PBCH) from the serving cell and the other cell, and decodes the PBCH contained in the SS block of the other cell based on the predetermined information. Judge whether or not.

The predetermined information may be an instruction as to whether or not to decode the PBCH included in the SS block of another cell. The control unit 401 can use information regarding whether or not another cell to be measured is synchronized with the serving cell as predetermined information. Further, the control unit 401 can use information as predetermined information regarding whether or not the other cell to be measured applies the single beam operation.

Further, the control unit 401 may specify the detection timing of the SS block in the other cell based on the predetermined timing of the serving cell when the PBCH included in the SS block of the other cell is not decoded.

Further, when the control unit 401 does not decode the PBCH included in the SS block of the other cell, at least a part of the index for identifying the SS block of the other cell in the measurement report using the SS block of the other cell. Control may be performed without including. The control unit 401 includes an index for identifying the SS block of the serving cell in the measurement report using the SS block related to the serving cell, and identifies the SS block of the other cell in the measurement report using the SS block related to the other cell. Control may be performed without including the index of.

Further, when the control unit 401 determines whether or not to decode the PBCH contained in the SS block of the other cell based on the predetermined information, the control unit 401 determines whether to decode the PBCH contained in the SS block of the other cell. For cell measurements (including SS block level measurements), different RRM requirements may be applied than if the PBCH contained in the SS block was not decoded. For example, when decoding the PBCH contained in the SS block of another cell, a relaxed RRM request is applied with respect to the measurement of the other cell as compared with the case where the PBCH is not decoded.

Further, when various information notified from the radio base station 10 is acquired from the received signal processing unit 404, the control unit 401 may update the parameters used for control based on the information.

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, channel state information (CSI), and the like, for example, based on 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 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 / or the signal after the reception processing to the measurement unit 405.

The measuring unit 405 performs measurement on the received signal. 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.

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

(Hardware configuration)
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 method of realizing each functional block is not particularly limited. That is, each functional block may be implemented using one physically and / or logically coupled device, or two or more physically and / or logically separated devices directly and / /. Alternatively, it may be indirectly connected (eg, by wire and / or wirelessly) and realized by using these plurality of devices.

For example, the wireless base station, user terminal, and the like in one embodiment of the present invention may function as a computer that processes the wireless communication method of the present invention. FIG. 9 is a diagram showing an example of the hardware configuration of the radio base station and the user terminal according to the embodiment of the present invention. 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 using other methods by one or more processors. The processor 1001 may be mounted by 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 is used. It is realized by controlling communication and controlling reading and / or 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 configured by 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 operating in the processor 1001, and may be realized in the same manner 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 disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (CD-ROM (Compact Disc ROM), etc.)), a digital versatile disc, 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 such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using a different bus for each device.

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 a part or all of each functional block may be realized by using the hardware. For example, processor 1001 may be implemented using at least one of these hardware.

(Modification example)
The terms described in the present specification 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.

Further, 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. Further, the mini slot may be referred to as a sub slot.

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. The unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.

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 that can be used in each user terminal, transmission power, 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), a code block, and / or a code word, or may be a processing unit such as scheduling and link adaptation. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, the code block, and / or the code word is actually mapped may be shorter than the TTI.

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. A TTI shorter than a normal TTI may be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a minislot, or a subslot.

The long TTI (for example, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and the short TTI (for example, shortened TTI, etc.) is less than the TTI length of the long TTI and 1 ms. It may be read as a TTI having the above TTI length.

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. One TTI and one subframe may each be composed of one or more resource blocks. One or more RBs include a physical resource block (PRB: Physical RB), a sub-carrier group (SCG: Sub-Carrier Group), a resource element group (REG: Resource Element Group), a PRB pair, an RB pair, and the like. May be called.

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 mini slot, 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 and RBs contained in a slot or minislot, included in the RB. The number of subcarriers, the number of symbols in the TTI, the symbol length, the cyclic prefix (CP) length, and the like can be changed in various ways.

In addition, the information, parameters, etc. described in the present specification may be expressed using absolute values, may be expressed using relative values from predetermined values, or may be expressed using other corresponding information. May be represented as. For example, radio resources may be indicated by a given index.

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 thus various assigned to these various channels and information elements. The name is not limited in any respect.

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 using 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.

The notification of information is not limited to the embodiments / embodiments described herein, and may be made using 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 using, 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 notification, but implicitly (for example, by not notifying the predetermined information or another information). May be done (by notification of).

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, software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and / or wireless technology (infrared, microwave, etc.) to websites, servers. , 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)", "Radio 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 used by those skilled in the art as 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. It may also be referred to by 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. In addition, words such as "up" and "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 operation performed by the base station may be performed by its upper node in some cases. In a network including one or more network nodes having a base station, various operations performed for communication with a terminal 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 may be switched and used according to the 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 is 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. For example, "connection" may be read as "access."

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

As used herein, the term "A and B are different" may mean "A and B are different from each other." Terms such as "separate" and "combined" may be interpreted similarly.

As used herein or in the claims, "including," "comprising," and variations thereof, these terms are as comprehensive as the term "comprising." Intended to be targeted. 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 present invention, which is determined based on the description of the claims. Therefore, the description herein is for purposes of illustration and does not give any limiting meaning to the present invention.

Claims (1)

A receiver that receives a sync signal block that includes a sync signal and a broadcast channel,
When the base station notifies the information about whether or not the adjacent cell is synchronized with the serving cell, the synchronization signal block index of the synchronization signal block transmitted by the adjacent cell is derived based on the timing of the serving cell. A terminal having a control unit, wherein a different index is used for each synchronization signal block in the synchronization signal burst as the synchronization signal block index.

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