WO2020183625A1 - ユーザ端末及び無線通信方法 - Google Patents
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- H04L5/00—Arrangements affording multiple use of the transmission path
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- H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
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Definitions
- the present disclosure relates to a user terminal and a wireless communication method in a next-generation mobile communication system.
- LTE Long Term Evolution
- 3GPP Rel.10-14 LTE-Advanced (3GPP Rel.10-14) has been specified for the purpose of further increasing the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).
- a successor system to LTE for example, 5th generation mobile communication system (5G), 5G + (plus), New Radio (NR), 3GPP Rel.15 or later, etc.) is also being considered.
- 5G 5th generation mobile communication system
- 5G + plus
- NR New Radio
- 3GPP Rel.15 or later, etc. is also being considered.
- the frequency band for example, Rel.8-12
- license carrier for example, license carrier
- license component carrier licensed by the telecommunications carrier (operator), etc.
- the specifications have been made on the assumption that exclusive operation will be performed in (also called).
- license CC for example, 800 MHz, 1.7 GHz, 2 GHz and the like are used.
- unlicensed band for example, a 2.4 GHz band or a 5 GHz band in which Wi-Fi (registered trademark) or Bluetooth (registered trademark) can be used is assumed.
- CA carrier aggregation
- LAA License-Assisted Access
- LBT Listen Before Talk
- the Synchronization Signal (SS) / Physical Broadcast CHannel (PBCH) block (SS block (SSB)) is used.
- SS block SS block
- PBCH Physical Broadcast CHannel
- the UE may not be able to properly derive the frame timing, and the communication throughput may decrease.
- one of the purposes of the present disclosure is to provide a user terminal and a wireless communication method capable of appropriately deriving the frame timing in the NR-U carrier.
- the user terminal is included in the Physical Broadcast CHannel (PBCH) payload other than the Master Information Block (MIB) defined by Release 15 New Radio (NR) in the predetermined carrier. It has a receiving unit that receives a synchronization signal block (SSB) including a PBCH that does not contain predetermined information, and a control unit that assumes that the value of the predetermined information is a predetermined value. It is characterized by.
- PBCH Physical Broadcast CHannel
- MIB Master Information Block
- NR Release 15 New Radio
- the frame timing can be appropriately derived in the NR-U carrier.
- FIG. 1 is a diagram showing an example of SSB transmission candidate positions.
- FIG. 2 is a diagram showing an example of the PBCH payload in the PBCH TTI.
- FIG. 3 is a diagram showing an example of expansion of the SSB transmission candidate position.
- 4A and 4B are diagrams showing an example of specifying the SSB candidate position.
- FIG. 5 is a diagram showing an example of a task of determining the SSB candidate position of NR-U.
- FIG. 6 is a diagram showing an example of mapping between the candidate position index and the effective SSB index.
- 7A and 7B are diagrams showing an example of a group index.
- FIG. 8 is a diagram showing an example when the unit of wraparound is small.
- FIG. 8 is a diagram showing an example when the unit of wraparound is small.
- FIG. 9 is a diagram showing an example of assuming a DRS unit size when the unit of wraparound is small.
- FIG. 10 is a diagram showing an example in which the number of DMRS series of PBCH is larger than the unit of wraparound.
- FIG. 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 12 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 13 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- FIG. 14 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- Unlicensed band In the unlicensed band (for example, 2.4 GHz band, 5 GHz band, 6 GHz band), it is assumed that a plurality of systems such as a Wi-Fi system and a system supporting LAA (LAA system) coexist. It is considered that collision avoidance and / or interference control of transmission between the plurality of systems is required.
- LAA system LAA system
- the data transmitter is a device of another device (eg, base station, user terminal, Wi-Fi device, etc.) before transmitting the data in the unlicensed band.
- Listening to confirm the presence or absence of transmission also called Listen Before Talk (LBT), Clear Channel Assessment (CCA), carrier sense, channel sensing, channel access operation, etc.
- LBT Listen Before Talk
- CCA Clear Channel Assessment
- carrier sense channel sensing
- channel access operation etc.
- the transmitting device may be, for example, a base station (for example, gNodeB (gNB)) for the downlink (DL) and a user terminal (for example, User Equipment (UE)) for the uplink (UL).
- a base station for example, gNodeB (gNB)
- UE User Equipment
- the receiving device that receives the data from the transmitting device may be, for example, a UE in DL and a base station in UL.
- the transmitting device starts data transmission after a predetermined period (for example, immediately after or during the backoff period) after the LBT detects that there is no transmission of another device (idle state). ..
- An NR system that uses an unlicensed band may be called an NR-Unlicensed (U) system, an NR LAA system, or the like. Dual Connectivity (DC) between the licensed band and the unlicensed band, Stand-Alone (SA) of the unlicensed band, etc. may also be included in the NR-U.
- DC Dual Connectivity
- SA Stand-Alone
- the node for example, base station, UE
- the node starts transmission after confirming that the channel is free (idle) by LBT for coexistence with another system or another operator.
- the base station or the UE acquires a transmission opportunity (Transmission Opportunity (TxOP)) when the LBT result is idle (LBT-idle) and performs transmission.
- TxOP Transmission Opportunity
- the base station or UE does not transmit when the LBT result is busy (LBT-busy).
- the time of transmission opportunity is also called Channel Occupancy Time (COT).
- LBT-idle may be read as success of LBT (LBT success).
- LBT-busy may be read as LBT failure.
- a synchronization signal / physical broadcast channel (SS / PBCH) block is used.
- the SS / PBCH block includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), a physical broadcast channel (PBCH), and a demodulation reference signal for the PBCH. It may be a signal block containing DeModulation Reference Signal (DMRS))).
- the SS / PBCH block may be referred to as a synchronization signal block (SSB).
- the SSB transmission unit may be referred to as SSB transmission period, SSB set, SS burst, SS burst set, SSB burst, or simply burst.
- the SSB index may indicate the position of the SSB per predetermined period (eg, half frame).
- the SSB index may be represented by a maximum number of 3 bits in Frequency Range 1 (FR1), or may be acquired by the UE by the DMRS sequence of PBCH.
- FR1 Frequency Range 1
- FR2 Frequency Range 2
- the SSB index may be represented by a total of 6 bits, the lower 3 bits according to the DMRS sequence of the PBCH and the upper 3 bits according to the payload of the PBCH, and is acquired by the UE based on these. May be done.
- FIG. 1 is a diagram showing an example of SSB transmission candidate positions.
- This example is an example of FR1, and it is assumed that the sub carrier spacing (Sub Carrier Spacing (SCS)) of the serving cell (or SSB) is 30 kHz and the slot length is 0.5 ms. Similar SCS (and slot length) are assumed in the following drawings. The application of the present disclosure is not limited to these frequency ranges, SCS (and slot length), and the like.
- SCS Sub Carrier Spacing
- Each SSB transmission candidate position corresponds to the SSB index # 0- # 7, and may be implicitly notified to the UE using a different DMRS sequence.
- the UE can specify the SSB index based on which DMRS series is detected among the eight patterns of DMRS series.
- the SSB corresponding to the SSB index is also simply referred to as the SSB index.
- the beam corresponding to the beam index is also simply called a beam index.
- each PBCH payload in the same half frame is an exact match. That is, the PBCH payload contained in the SSB of the first SSB index in a half frame is the same as the PBCH payload contained in the SSB of the second SSB index in the same half frame. According to this configuration, the UE that can detect a plurality of SSBs can easily perform soft combining of PBCHs, and can improve the reception quality of PBCHs.
- MIB Master Information Block
- PBCH TTI Transmission Time Interval
- the PBCH payload other than MIB is 8 bits in Rel-15 NR and contains the following information for FR1: -Lower 4 bits (4 bits) of the system frame number (SFN), ⁇ Half frame bit (1 bit), -The upper 1 bit (1 bit) of ssb-SubcarrierOffset (k SSB ), -Reserved (2 bits).
- the ssb-SubcarrierOffset corresponds to the value k SSB in which the frequency domain offset between the SSB and the entire resource block grid is indicated by the number of subcarriers. Since the ssb-SubcarrierOffset is notified of 4 bits in the MIB, the k SSB can be represented by 5 bits in consideration of the upper 1 bit of the k SSB included in the PBCH payload. In the present disclosure, ssb-SubcarrierOffset and k SSB may be read interchangeably.
- the upper 1 bit of k SSB and the total of 3 bits of Reserved may indicate the upper 3 bits of the SSB index.
- FIG. 2 is a diagram showing an example of the PBCH payload in the PBCH TTI.
- SSB is transmitted from SFN # 0 in a cycle of 20 ms within 8 radio frames (SFN # 0- # 7) corresponding to PBCH TTI (80 ms).
- the lower 4 bits of SFN are "0000" for SFN # 0, "0010” for SFN # 2, "0100” for SFN # 4, and "0110” for SFN # 6. Therefore, in the SSB having a cycle of 20 ms, only the second and third bits of the lower four bits of the SFN change, and the first and fourth bits have fixed values.
- the half frame bit varies depending on the position (first or second) of the half frame in the radio frame when the SSB period is 5 ms or less, but when the SSB period is larger than 5 ms, the SSB is different in the PBCH TTI. Match between bursts.
- the UE may be set with upper layer parameters related to SSB burst (for example, it may be called Radio Resource Control (RRC) parameter "ssb-PositionsInBurst").
- RRC Radio Resource Control
- the upper layer parameter may be referred to as information (parameter) regarding the position of the time domain of the transmitted SSB in the burst.
- the upper layer parameter is described as ssb-PositionsInBurst, but the name is not limited to this.
- the UE may assume that SSBs corresponding to the same SSB index in the same cell are QCLs. Further, the UE does not have to assume QCL between SSBs corresponding to different SSB indexes in the same cell.
- the QCL may be an index showing the statistical properties of at least one of the signal and the channel (expressed as a signal / channel). For example, when one signal / channel and another signal / channel have a QCL relationship, a Doppler shift, a Doppler spread, and an average delay are performed between these different signals / channels. ), Delay spread, Spatial parameter (for example, Spatial Rx Parameter) can be assumed to be the same (QCL for at least one of these). You may.
- a given control resource set (COntrol REsource SET), channel or reference signal has a particular QCL (eg, QCL type D) relationship with another CORESET, channel or reference signal. It may be called a QCL assumption.
- DRS Discovery Reference Signal
- NR-U DRS NR-U DRS
- a DRS is a temporally continuous signal, even a signal comprising one or more sets of SSBs and a CORESET and Physical Downlink Shared Channel (PDSCH) associated with the one or more SSBs. Good.
- the DRS may include Channel State Information (CSI) -Reference Signal (RS).
- CSI Channel State Information
- RS Reference Signal
- the DRS may be referred to as a discovery reference signal, a discovery signal (DS), or the like.
- the CORESET (Physical Downlink Control Channel (PDCCH)) associated with the SSB may be referred to as Remaining Minimum System Information (RMSI) -CORESET, CORESET # 0, or the like.
- RMSI may be referred to as SIB1.
- the PDSCH associated with the SSB may be a PDSCH (RMSI PDSCH) that carries the RMSI, or a Cyclic Redundancy Check scrambled by the PDCCH (System Information (SI) -Radio Network Temporary Identifier (RNTI)) in the RMSI-CORESET. It may be a PDSCH scheduled using DCI) with (CRC).
- SI System Information
- RNTI Radio Network Temporary Identifier
- SSBs with different SSB indexes may be transmitted using different beams (base station transmission beams).
- the SSB and the corresponding RMSI PDCCH and RMSI PDSCH may be transmitted using the same beam.
- One DRS may be called a DRS unit.
- the DRS unit size (time length) may be, for example, a half slot, one slot, or the like.
- NR-U it is being considered to expand the transmission candidate position of SSB in consideration of the case where DRS including SSB cannot transmit due to failure of LBT. For example, during the period when DRS may be transmitted (DRS transmission window), the SSB transmission candidate position is expanded, and the SSB (beam) that could not be transmitted due to the failure of LBT is set to another transmission candidate position in the window. It is being considered to be used for transmission.
- the length of the DRS transmission window may be set in the UE by upper layer signaling or may be specified by the specifications.
- the DRS transmission window may be referred to as a DRS transmission period, a DRS transmission window period, a DRS window, or the like.
- the upper layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.
- RRC Radio Resource Control
- MAC Medium Access Control
- MAC CE MAC Control Element
- PDU MAC Protocol Data Unit
- the broadcast information includes, for example, a master information block (Master Information Block (MIB)), a system information block (System Information Block (SIB)), a minimum system information (Remaining Minimum System Information (RMSI)), and other system information ( Other System Information (OSI)) may be used.
- MIB Master Information Block
- SIB System Information Block
- RMSI Minimum System Information
- OSI Other System Information
- the SSB transmission candidate position may represent the position of the first symbol of the SSB candidate.
- the SSB transmission candidate position may be read as a DRS transmission candidate position, a DRS unit, or the like.
- FIG. 3 is a diagram showing an example of expansion of the SSB transmission candidate position.
- the length of the DRS transmission window is assumed to be 5 ms. Similar DRS transmission window lengths are assumed in the subsequent drawings. The application of the present disclosure is not limited to this DRS transmission window length.
- the beam index may correspond to a set of SSB indexes that can be assumed to be QCL in the DRS transmission window. Therefore, the beam index may be read as an effective SSB index (effective SSB index). For example, when the base station uses four SSB beams, the UE has SSBs with candidate position indexes # 4i to # 4i + 3 (i is an integer greater than or equal to 0), SSBs and QCLs with effective SSB indexes # 0- # 3, respectively. You may assume that.
- an index that simply indicates the SSB candidate position in the DRS transmission window may be called an SSB position index, a location index, a candidate position index, or the like.
- the UE determines at which candidate position in the DRS transmit window the SSB was detected based on one of the following: (1) Combination of DMRS series and PBCH payload, (2) DMRS series only, (3) PBCH payload only, (4) A combination of the DMRS sequence and the phase difference between the DMRS and the Secondary Synchronization Signal (SSS).
- SSS Secondary Synchronization Signal
- FIGS. 4A and 4B are diagrams showing an example of specifying the SSB candidate position.
- the UE identifies the detected SSB position in the DRS transmission window based on the above (1).
- slots # 0- # 2 are not transmitted due to LBT failure.
- the effective SSB index # 0- # 3 corresponding to the position index # 0- # 3 that should have been transmitted in slots # 0 and # 1 is the slot # 3 and # 4 (position index # 6) in the same DRS transmission window. -It may be transmitted in # 9).
- the same shaded SSB may indicate that the same beam is applied (or the same QCL is assumed). Different shaded SSBs may represent that different beams are applied to them (or different QCLs are assumed).
- the PBCH payload of each SSB may include information on the unit of wrap around (or wrapping around) and information on the group index.
- the wraparound unit information may correspond to information on how many SSB candidate positions (position indexes) the same effective SSB index repeats.
- the information in (1) above may be referred to as, for example, information on the maximum number of effective SSB indexes, information on the period of effective SSB indexes, information on repetitive transmission units of SSB, information on the number of transmitted SSBs, and the like.
- wraparound may mean that an index such as an effective SSB index returns to 0 after reaching the maximum value.
- the unit of wraparound is preferably the same within one DRS transmit window.
- the information of the group index may correspond to the information for deriving the half frame timing of the cell, or may indicate the candidate position corresponding to the number of wraparounds.
- the group index information includes, for example, information on the position index of the detected SSB in the DRS transmission window, information for identifying the number of times the detected SSB is the same effective SSB index in the DRS transmission window, and the effective SSB. It may be called information for identifying the position index from the index, timing-related information, timing information, or the like.
- FIG. 4A an example is shown in which the unit of wraparound is four and the group index is # 0 to # 4.
- the wraparound unit may be represented by the number of slots (or DRS unit size), and in the case of FIG. 4A, the wraparound unit may be represented by 2 slots.
- the UE Based on the wraparound unit obtained by decoding the PBCH, the UE calculates the position index corresponding to the effective SSB index in the DRS transmission window for the detected cell and the peripheral cells of the same frequency (at least the cells of the same operator). It may be specified (judgment).
- the UE may specify (determine) the half frame timing of the detected cell and the peripheral cells of the same frequency based on the group index obtained by decoding the PBCH.
- the half frame timing may be read as at least one such as a frame timing and a slot timing.
- the detected SSB position index is # 7. You may decide that.
- the PBCH payload of each SSB may include the above-mentioned wraparound unit information and burst start position index information.
- the controls related to the unit of wraparound may be the same as in FIG. 4A, so the description will not be repeated.
- the burst start position index information may be called, for example, the information of the SSB candidate position index that started the transmission of the SSB burst, the information of the burst start SSB candidate position index, and the like.
- the UE may specify (determine) the half frame timing of the detected cell and the peripheral cells of the same frequency based on the burst start position index obtained by decoding the PBCH.
- the detected SSB position index is It may be determined to be # 7.
- ⁇ Issues to determine the SSB candidate position of NR-U> As described above, by including the information required for frame timing derivation (for example, at least one of wraparound unit information, group index information, and burst start position index information) in the PBCH payload. , It is being considered to identify the candidate position of the detected SSB. However, the MIB of the PBCH must be constant within the PBCH TTI. In consideration of this, the specific configuration of including information such as the unit of wraparound in the PBCH payload has not yet been examined.
- the information required for frame timing derivation for example, at least one of wraparound unit information, group index information, and burst start position index information
- FIG. 5 is a diagram showing an example of a task of determining the SSB candidate position of NR-U.
- the unit of wraparound is 1. That is, the same effective SSB index corresponds to each position index.
- both the group index and the burst start position index need to take a value of 0-19, and 5 bits are required for each to express.
- the UE may not be able to properly derive the frame timing, and the communication throughput may decrease.
- the present inventors have configured the PBCH payloads of different SSBs in the PBCH TTI so that the MIBs are always common and the remaining bits are as common as possible even if they are NR-U carriers.
- the NR-U of the present disclosure is not limited to LAA, and may include a case where an unlicensed band is used stand-alone.
- the NR-U carrier may be read as a carrier in which LBT is used, an unlicensed carrier, an unlicensed band, a predetermined carrier, or the like.
- a value shorter than a predetermined value (for example, 20 ms) (for example, 5 ms, 10 ms, etc.) is used (or set) as the SSB (DRS) transmission cycle.
- the UE does not have to assume that.
- the NR-U carrier does not have to include the information contained in the existing PBCH payload other than the MIB.
- the UE may assume a predetermined value (for example, 0, 1) for the information contained in the existing PBCH payload other than the MIB.
- the "existing PBCH payload other than the MIB" referred to here may mean a PBCH payload other than the MIB of Rel-15NR at the time of the present application.
- the UE may assume that in the NR-U carrier, the PBCH payload does not include half frame bits and the half frame bits are always 0 (or 1). This is because it is difficult to fix the Time Division Duplex (TDD) pattern etc. in the unlicensed band, so SSB (DRS) is always based on the specific (for example, the first) half frame of SFN # 0 and the half frame. This is because it may be determined that the half frame has a predetermined period.
- TDD Time Division Duplex
- DRS Time Division Duplex
- PRB physical resource block
- the UE does not include a predetermined number of bits (for example, lower X bits) of the lower 4 bits of SFN in the PBCH payload, and the predetermined number of bits always have a fixed value (for example, for example). It may be assumed that all 0 (or all 1)). This is because if the SSB (DRS) transmission cycle is, for example, 10 * 2 X ms or more, the lower X bit is always fixed (for example, fixed to 0).
- DRS SSB
- the PBCH payload other than the MIB can be reduced by, for example, 4 to 6 bits as compared with the PBCH payload other than the MIB in Rel-15 NR, and can be used for notification of other information. ..
- the second embodiment relates to how the PBCH payload in the NR-U carrier contains the information required for frame timing derivation.
- wraparound unit information is included in the MIB, and other information that can change within the PBCH TTI (for example, group index) is sent in bits outside the MIB. May be good.
- the wraparound unit is a parameter that determines the mapping between the candidate position index and the effective SSB index, and corresponds to a value that does not change in the DRS transmission window. Therefore, it is preferable to include the wraparound unit in the MIB.
- FIG. 6 is a diagram showing an example of mapping between the candidate position index and the effective SSB index.
- M in the figure indicates the value of the unit of wraparound.
- M i (i is an integer)
- the existing MIB in Rel-15 NR does not have a parameter corresponding to the unit of wraparound. Therefore, the wraparound unit information can be expressed explicitly or using at least one of the existing (Release 15 New Radio (NR)) MIB parameters (eg, pdcch-ConfigSIB1, ssb-SubcarrierOffset).
- NR New Radio
- the UE has a common CORESET, a common search space, and information for determining the required PDCCH parameters (RRC parameter "pdcch-ConfigSIB1”), and the UE has CORESET # 0 (CORESET zero, ID). Determines # 0 CORESET) and search space # 0 (search space zero, common search space with ID # 0). More specifically, the UE determines the setting of CORESET # 0 (number of CORESET symbols, etc.) based on the value of the upper 4 bits (RRC parameter "controlResourceSetZero") of pdcch-ConfigSIB1 and lower 4 of pdcch-ConfigSIB1. The setting of search space # 0 (PDCCH monitoring cycle, etc.) is determined based on the value of the bit (RRC parameter "searchSpaceZero").
- the UE may determine the value of the wraparound unit based on the value of a specific bit (for example, upper 4 bits and lower 4 bits) of pdcch-ConfigSIB1.
- the correspondence between the specific bit and the value of the wraparound unit may be defined by the specification, for example, by a table different from Rel-15 NR.
- a wraparound unit may be included as part of at least one of the CORESET # 0 and search space # 0 settings associated with pdcch-ConfigSIB1 in the NR-U.
- the group index is a parameter indicating the number of candidate positions corresponding to the wraparound, and changes in the DRS transmission window. For this reason, the group index is preferably included in the non-MIB portion of the PBCH payload.
- FIG. 7A and 7B are diagrams showing an example of a group index.
- the unit of wraparound is 8 in FIG. 7A and 4 in FIG. 7B.
- the smaller the value of the wraparound unit the more bits required to represent the group index. Further, the smaller the value of the unit of wraparound, the smaller the number of SSBs in the group (same wraparound) (that is, the number of SSBs having the same PBCH payload), and the soft synthesis becomes difficult.
- FIG. 8 is a diagram showing an example when the unit of wraparound is small.
- the unit of wraparound is 2 in this example.
- the value of the group index is # 0- # 9, and 4 bits are required to express it.
- a constraint may be set so that the number of bits required outside the MIB does not increase too much due to the small value of the wraparound unit.
- the UE may assume that it does not support values smaller than a given value (eg, 4) as the unit of wraparound.
- bit size of the group index is fixed (for example, 3 bits), and it is assumed that SSB (DRS) transmission at a candidate position corresponding to a group index with a large value that cannot be expressed by this bit size is not supported. It may be (in other words, the UE does not have to expect such SSB (DRS) reception).
- DRS SSB
- the SSB (DRS) is transmitted at the position index # 0- # 15 corresponding to the group index # 0- # 7, and the group index is used. It may be assumed that the position index # 16- # 19 corresponding to # 8- # 9 is not transmitted.
- a predetermined value for example, 4
- FIG. 9 is a diagram showing an example of assuming the DRS unit size when the unit of wraparound is small.
- the unit of wraparound is 2 as in FIG. 8, except that the DRS unit size is 1 slot instead of half slot.
- the transmittable candidate positions of DRS are only even-numbered position indexes.
- the possible values of the group index are reduced from a maximum of 9 to a maximum of 4, and the number of bits representing the group index is also reduced to 3 bits as compared with FIG.
- the burst start position index is a parameter indicating the candidate position index at which the transmission of the burst of SSB (DRS) is started, and changes in the DRS transmission window. For this reason, the burst start position index is preferably included in the non-MIB portion of the PBCH payload.
- the burst start position index needs to represent a candidate position where transmission may start.
- the maximum value of the burst start position index may be, for example, the value of the maximum candidate position index in the DRS transmission window, or the value of the wraparound unit from the value of the maximum candidate position index in the DRS transmission window. It may be the subtracted value.
- SSB transmittable candidate positions of the DRS
- the UE may assume that the maximum value of the burst start position index is a specific value (for example, 15). Even when there are 20 SSB candidate positions in FIG. 5, if the maximum value of the burst start position index is 15, the number of bits for the index is 4 bits. The UE may not expect the reception of the SSB (DRS) at the position index exceeding the specific value, or may assume that the transmission of the SSB is not started.
- DRS SSB
- the UE may assume that the burst start position index is included in the PBCH payload when the value of the wraparound unit is equal to or less than a predetermined threshold value.
- the UE may assume that the PBCH payload contains the group index described above if the value of the wraparound unit obtained by the MIB is greater than a predetermined threshold. This is because when the wraparound unit is relatively large, the number of bits required for the group index is smaller than the burst start position index.
- the information required for deriving the frame timing can be preferably notified to the UE by using the MIB and the PBCH payload other than the MIB.
- the unit of wraparound is the same as the number of beams applied to the SSB (the number of possible values of the effective SSB index) and matches the number of DMRS series of the PBCH used. ..
- the unit of wraparound of the present disclosure may be different from the number of DMRS series of PBCH.
- different DMRS sequences may be used for SSB (DRS) with the same effective SSB index.
- the size of the group can be increased and the group index can be reduced.
- the UE may assume that the number of DMRS series of PBCH is larger than the value of the unit of wraparound under predetermined conditions. For example, the UE assumes that when the unit of wraparound is a specific value (for example, 1, 2, 3, etc.), there are a predetermined number of patterns (for example, 4 patterns) of the DMRS series of PBCH. May be good.
- a specific value for example, 1, 2, 3, etc.
- patterns for example, 4 patterns
- the number of patterns of the DMRS series is X, it may be assumed that the patterns # 0 to # X-1 of the DMRS series are included in the same group (corresponding to the same group index).
- FIG. 10 is a diagram showing an example in which the number of DMRS series of PBCH is larger than the unit of wraparound.
- the allocation of the position index and the effective SSB index is the same as in FIG.
- the effective SSB indexes # 0 and # 1 corresponded to the patterns # 0 and # 1 of the DMRS series, respectively.
- This example differs from FIG. 8 in that the effective SSB indexes # 0, # 1, # 0 and # 1 correspond to the patterns # 0, # 1, # 2 and # 3 of the DMRS series, respectively.
- the set of DMRS series patterns # 0, # 1, # 2 and # 3 corresponds to the group indicated by the group index.
- the group index may mean a parameter indicating the number of candidate positions where the same DMRS series is transmitted in the DRS transmission window.
- the possible values of the group index are reduced from a maximum of 9 to a maximum of 4, and the number of bits representing the group index is also reduced to 3 bits as compared with FIG.
- wraparound unit values in this disclosure may be limited.
- the UE does not have to support small values (eg, 1), specific prime numbers (eg, 3, 5, 7, etc.) as units of wraparound.
- the number of PBCH DMRS series may be called the unit of wraparound.
- the UE may be notified by higher layer signaling (for example, MIB, SIB or RRC) regarding the correspondence between the DMRS sequence and the effective SSB index.
- higher layer signaling for example, MIB, SIB or RRC
- the UE indicates that the patterns # 0, # 1, # 2 and # 3 of the DMRS series correspond to the effective SSB indexes # 0, # 1, # 0 and # 1, respectively. It may be set using signaling.
- the PBCH TTI in the present disclosure is not limited to 80 ms. Those skilled in the art can understand that each embodiment of the present disclosure can be appropriately modified and applied even when the PBCH TTI is not 80 ms.
- wireless communication system Wireless communication system
- communication is performed using any one of the wireless communication methods according to each of the above-described embodiments of the present disclosure or a combination thereof.
- FIG. 11 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- the wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc. specified by Third Generation Partnership Project (3GPP). ..
- the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technology (RAT) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC is dual connectivity (E-UTRA-NR Dual Connectivity (EN-DC)) between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR, and dual connectivity between NR and LTE (NR-E).
- -UTRA Dual Connectivity (NE-DC) may be included.
- the LTE (E-UTRA) base station (eNB) is the master node (Master Node (MN)), and the NR base station (gNB) is the secondary node (Secondary Node (SN)).
- the NR base station (gNB) is MN
- the LTE (E-UTRA) base station (eNB) is SN.
- the wireless communication system 1 has dual connectivity between a plurality of base stations in the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )) May be supported.
- a plurality of base stations in the same RAT for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) in which both MN and SN are NR base stations (gNB). )
- NR-NR Dual Connectivity NR-DC
- gNB NR base stations
- the wireless communication system 1 includes a base station 11 that forms a macro cell C1 having a relatively wide coverage, and a 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. You may prepare.
- the user terminal 20 may be located in at least one cell. 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 base stations 11 and 12 are not distinguished, they are collectively referred to as the base station 10.
- the user terminal 20 may be connected to at least one of the plurality of base stations 10.
- the user terminal 20 may use at least one of carrier aggregation (Carrier Aggregation (CA)) and dual connectivity (DC) using a plurality of component carriers (Component Carrier (CC)).
- CA Carrier Aggregation
- DC dual connectivity
- CC Component Carrier
- Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)).
- the macro cell C1 may be included in FR1 and the small cell C2 may be included in FR2.
- FR1 may be in a frequency band of 6 GHz or less (sub 6 GHz (sub-6 GHz)), and FR2 may be in a frequency band higher than 24 GHz (above-24 GHz).
- the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.
- the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.
- TDD Time Division Duplex
- FDD Frequency Division Duplex
- the plurality of base stations 10 may be connected by wire (for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (for example, NR communication).
- wire for example, optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.
- NR communication for example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 corresponding to the higher-level station is the Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) is the IAB. It may be called a node.
- IAB Integrated Access Backhaul
- relay station relay station
- the base station 10 may be connected to the core network 30 via another base station 10 or directly.
- the core network 30 may include at least one such as Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).
- EPC Evolved Packet Core
- 5GCN 5G Core Network
- NGC Next Generation Core
- the user terminal 20 may be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.
- a wireless access method based on Orthogonal Frequency Division Multiplexing may be used.
- OFDM Orthogonal Frequency Division Multiplexing
- DL Downlink
- UL Uplink
- CP-OFDM Cyclic Prefix OFDM
- DFT-s-OFDM Discrete Fourier Transform Spread OFDM
- OFDMA Orthogonal Frequency Division Multiple. Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the wireless access method may be called a waveform.
- another wireless access system for example, another single carrier transmission system, another multi-carrier transmission system
- the UL and DL wireless access systems may be used as the UL and DL wireless access systems.
- downlink shared channels Physical Downlink Shared Channel (PDSCH)
- broadcast channels Physical Broadcast Channel (PBCH)
- downlink control channels Physical Downlink Control
- Channel PDCCH
- the uplink shared channel Physical Uplink Shared Channel (PUSCH)
- the uplink control channel Physical Uplink Control Channel (PUCCH)
- the random access channel shared by each user terminal 20 are used.
- Physical Random Access Channel (PRACH) Physical Random Access Channel or the like may be used.
- PDSCH User data, upper layer control information, System Information Block (SIB), etc. are transmitted by PDSCH.
- User data, upper layer control information, and the like may be transmitted by the PUSCH.
- MIB Master Information Block
- PBCH Master Information Block
- Lower layer control information may be transmitted by PDCCH.
- the lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of PDSCH and PUSCH.
- DCI Downlink Control Information
- the DCI that schedules PDSCH may be called DL assignment, DL DCI, etc.
- the DCI that schedules PUSCH may be called UL grant, UL DCI, etc.
- the PDSCH may be read as DL data
- the PUSCH may be read as UL data.
- a control resource set (COntrol REsource SET (CORESET)) and a search space (search space) may be used to detect the PDCCH.
- CORESET corresponds to a resource that searches for DCI.
- the search space corresponds to the search area and search method of PDCCH candidates (PDCCH candidates).
- One CORESET may be associated with one or more search spaces. The UE may monitor the CORESET associated with a search space based on the search space settings.
- One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels.
- One or more search spaces may be referred to as a search space set.
- the "search space”, “search space set”, “search space setting”, “search space set setting”, “CORESET”, “CORESET setting”, etc. of the present disclosure may be read as each other.
- channel state information (Channel State Information (CSI)
- delivery confirmation information for example, hybrid automatic repeat reQuest ACK knowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request for example
- the PRACH may transmit a random access preamble to establish a connection with the cell.
- downlinks, uplinks, etc. may be expressed without “links”. Further, it may be expressed without adding "Physical" at the beginning of various channels.
- a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), and the like may be transmitted.
- the DL-RS includes a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), and a demodulation reference signal (DeModulation).
- CRS Cell-specific Reference Signal
- CSI-RS Channel State Information Reference Signal
- DeModulation Demodulation reference signal
- Reference Signal (DMRS)), positioning reference signal (Positioning Reference Signal (PRS)), phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), and the like may be transmitted.
- PRS Positioning Reference Signal
- PTRS Phase Tracking Reference Signal
- the synchronization signal may be, for example, at least one of a primary synchronization signal (Primary Synchronization Signal (PSS)) and a secondary synchronization signal (Secondary Synchronization Signal (SSS)).
- PSS Primary Synchronization Signal
- SSS Secondary Synchronization Signal
- the signal block including SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be referred to as SS / PBCH block, SS Block (SSB) and the like.
- SS, SSB and the like may also be called a reference signal.
- a measurement reference signal Sounding Reference Signal (SRS)
- a demodulation reference signal DMRS
- UL-RS Uplink Reference Signal
- UE-specific Reference Signal UE-specific Reference Signal
- FIG. 12 is a diagram showing an example of the configuration of the base station according to the embodiment.
- the base station 10 includes a control unit 110, a transmission / reception unit 120, a transmission / reception antenna 130, and a transmission line interface 140.
- the control unit 110, the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140 may each be provided with one or more.
- the functional blocks of the feature portion in the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. A part of the processing of each part described below may be omitted.
- the control unit 110 controls the entire base station 10.
- the control unit 110 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 110 may control signal generation, scheduling (for example, resource allocation, mapping) and the like.
- the control unit 110 may control transmission / reception, measurement, and the like using the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the control unit 110 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 120.
- the control unit 110 may perform call processing (setting, release, etc.) of the communication channel, state management of the base station 10, management of radio resources, and the like.
- the transmission / reception unit 120 may include a baseband unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123.
- the baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212.
- the transmission / reception unit 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which are described based on common recognition in the technical fields according to the present disclosure. be able to.
- the transmission / reception unit 120 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 1211 and an RF unit 122.
- the receiving unit may be composed of a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.
- the transmitting / receiving antenna 130 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 120 may receive the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 120 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 120 processes, for example, Packet Data Convergence Protocol (PDCP) layer processing and Radio Link Control (RLC) layer processing (for example, RLC) for data, control information, etc. acquired from control unit 110.
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- MAC Medium Access Control
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 120 performs channel coding (may include error correction coding), modulation, mapping, filtering, and discrete Fourier transform (Discrete Fourier Transform (DFT)) for the bit string to be transmitted.
- the base band signal may be output by performing processing (if necessary), inverse fast Fourier transform (IFFT) processing, precoding, digital-analog conversion, and other transmission processing.
- IFFT inverse fast Fourier transform
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. to the radio frequency band on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 130. ..
- the transmission / reception unit 120 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 130.
- the transmission / reception unit 120 (reception processing unit 1212) performs analog-digital conversion, fast Fourier transform (FFT) processing, and inverse discrete Fourier transform (IDFT) on the acquired baseband signal. )) Processing (if necessary), filtering, decoding, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing are applied. User data and the like may be acquired.
- FFT fast Fourier transform
- IDFT inverse discrete Fourier transform
- the transmission / reception unit 120 may perform measurement on the received signal.
- the measuring unit 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, or the like based on the received signal.
- the measuring unit 123 has received power (for example, Reference Signal Received Power (RSRP)) and reception quality (for example, Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)).
- RSRP Reference Signal Received Power
- RSSQ Reference Signal Received Quality
- SINR Signal to Noise Ratio
- Signal strength for example, Received Signal Strength Indicator (RSSI)
- propagation path information for example, CSI
- the measurement result may be output to the control unit 110.
- the transmission line interface 140 transmits and receives signals (backhaul signaling) to and from devices included in the core network 30, other base stations 10, and the like, and provides user data (user plane data) and control plane for the user terminal 20. Data or the like may be acquired or transmitted.
- the transmitting unit and the receiving unit of the base station 10 in the present disclosure may be composed of at least one of the transmission / reception unit 120, the transmission / reception antenna 130, and the transmission line interface 140.
- the transmission / reception unit 120 refers to the user terminal 20 with information regarding the position of the synchronization signal block (Synchronization Signal Block (SSB)) in the synchronization signal (Synchronization Signal (SS)) burst (for example, the upper layer parameter “ssb-”. PositionsInBurst ”) may be sent.
- SSB Synchronization Signal Block
- SS Synchronization Signal
- the transmission / reception unit 120 may transmit SSB, DRS, or the like.
- the transmitter / receiver 120 includes, in the PBCH payload of the SSB, information necessary for deriving the frame timing (for example, at least one of wraparound unit information, group index information, and burst start position index information). You may send it.
- FIG. 13 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- the user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230.
- the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may each be provided with one or more.
- 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. A part of the processing of each part described below may be omitted.
- the control unit 210 controls the entire user terminal 20.
- the control unit 210 can be composed of a controller, a control circuit, and the like described based on the common recognition in the technical field according to the present disclosure.
- the control unit 210 may control signal generation, mapping, and the like.
- the control unit 210 may control transmission / reception, measurement, and the like using the transmission / reception unit 220 and the transmission / reception antenna 230.
- the control unit 210 may generate data to be transmitted as a signal, control information, a sequence, and the like, and transfer the data to the transmission / reception unit 220.
- the transmission / reception unit 220 may include a baseband unit 221 and an RF unit 222, and a measurement unit 223.
- the baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212.
- the transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, and the like, which are described based on the common recognition in the technical field according to the present disclosure.
- the transmission / reception unit 220 may be configured as an integrated transmission / reception unit, or may be composed of a transmission unit and a reception unit.
- the transmission unit may be composed of a transmission processing unit 2211 and an RF unit 222.
- the receiving unit may be composed of a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.
- the transmitting / receiving antenna 230 can be composed of an antenna described based on common recognition in the technical field according to the present disclosure, for example, an array antenna.
- the transmission / reception unit 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, and the like.
- the transmission / reception unit 220 may transmit the above-mentioned uplink channel, uplink reference signal, and the like.
- the transmission / reception unit 220 may form at least one of a transmission beam and a reception beam by using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), and the like.
- digital beamforming for example, precoding
- analog beamforming for example, phase rotation
- the transmission / reception unit 220 (transmission processing unit 2211) performs PDCP layer processing, RLC layer processing (for example, RLC retransmission control), and MAC layer processing (for example, for data, control information, etc. acquired from the control unit 210). , HARQ retransmission control), etc., to generate a bit string to be transmitted.
- RLC layer processing for example, RLC retransmission control
- MAC layer processing for example, for data, control information, etc. acquired from the control unit 210.
- HARQ retransmission control HARQ retransmission control
- the transmission / reception unit 220 (transmission processing unit 2211) performs channel coding (may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), and IFFT processing for the bit string to be transmitted. , Precoding, digital-to-analog conversion, and other transmission processing may be performed to output the baseband signal.
- Whether or not to apply the DFT process may be based on the transform precoding setting.
- the transmission / reception unit 220 transmission processing unit 2211 described above for transmitting a channel (for example, PUSCH) using the DFT-s-OFDM waveform when the transform precoding is enabled.
- the DFT process may be performed as the transmission process, and if not, the DFT process may not be performed as the transmission process.
- the transmission / reception unit 220 may perform modulation, filtering, amplification, etc. to the radio frequency band on the baseband signal, and transmit the signal in the radio frequency band via the transmission / reception antenna 230. ..
- the transmission / reception unit 220 may perform amplification, filtering, demodulation to a baseband signal, or the like on the signal in the radio frequency band received by the transmission / reception antenna 230.
- the transmission / reception unit 220 (reception processing unit 2212) performs analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering processing, demapping, demodulation, and decoding (error correction) for the acquired baseband signal. Decoding may be included), MAC layer processing, RLC layer processing, PDCP layer processing, and other reception processing may be applied to acquire user data and the like.
- the transmission / reception unit 220 may perform measurement on the received signal.
- the measuring unit 223 may perform RRM measurement, CSI measurement, or the like based on the received signal.
- the measuring unit 223 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 210.
- the transmitter and receiver of the user terminal 20 in the present disclosure may be composed of at least one of the transmitter / receiver 220 and the transmitter / receiver antenna 230.
- the transmission / reception unit 220 receives information regarding the position of the synchronization signal block (Synchronization Signal Block (SSB)) in the synchronization signal (Synchronization Signal (SS)) burst (for example, the upper layer parameter “ssb-PositionsInBurst”). May be good.
- the information may be notified using, for example, at least one of System Information Block 1 (SIB1) and RRC signaling.
- SIB1 System Information Block 1
- the control unit 210 uses a Quasi- between SSB indexes in the transmission window of the discovery reference signal (DRS) in the carrier to which listening is applied (for example, an unlicensed carrier). Co-Location (QCL) assumptions may be determined.
- DRS discovery reference signal
- the carrier to which listening is applied may be called a LAA cell, a LAA secondary cell (LAA SCell), or the like.
- the user terminal 20 may perform listening before transmission.
- the "listening" of the present disclosure may be read by at least one of Listen Before Talk (LBT), Clear Channel Assessment (CCA), carrier sense, sensing, channel sensing, channel access operation, and the like.
- the transmission / reception unit 220 may receive (or detect) the SSB.
- the control unit 210 may acquire an effective SSB index based on the DMRS of the PBCH included in the SSB.
- the SSB of the present disclosure may be read as SSB included in DRS, or may be read as DRS.
- the control unit 210 may acquire at least one of the information on the number of the effective SSB indexes to be transmitted and the start position index of the SSB burst including the SSB in the DRS transmission window from the payload of the PBCH.
- the control unit 210 may apply soft combining to the decoding of the plurality of PBCHs in the SSB burst.
- the transmission / reception unit 220 may synthesize and receive a plurality of the PBCHs in the SSB burst.
- the transmission / reception unit 220 is defined by Release 15 New Radio (NR) (for example, TS 38.331 V15.4.0 (2018-12)) in a predetermined carrier (for example, a carrier to which the above listening is applied).
- NR New Radio
- a predetermined carrier for example, a carrier to which the above listening is applied.
- a synchronization signal block (Synchronization Signal Block (SSB)) may be received, which includes a PBCH that does not include predetermined information contained in a Physical Broadcast CHannel (PBCH) payload other than the master information block (MIB). ..
- PBCH Physical Broadcast CHannel
- MIB master information block
- the "MIB specified by Release 15 NR" in this disclosure is a MIB specified by 3GPP Release 16 or later (for example, a MIB containing the same information as the MIB specified by Release 15 NR), a MIB for licensed carriers. , MIB for non-standalone, MIB for stand-alone, etc. may be read as.
- the control unit 210 may assume that the value of the predetermined information is a predetermined value.
- the predetermined information may be a half frame bit, may be the upper 1 bit of the ssb-SubcarrierOffset, or may be a predetermined number of bits among the lower 4 bits of the system frame number. May be good.
- control unit 210 sets the value of the predetermined information included in the portion of the PBCH payload defined by Release 15 NR that does not correspond to the MIB, and the predetermined value for the predetermined carrier regardless of the PBCH. You may assume that.
- the control unit 210 is based on the information (pdcch-ConfigSIB1) for determining the common control resource set, the common search space, and the necessary Physical Downlink Control Channel (PDCCH) parameters included in the master information block of the PBCH. You may get the value of the unit of the wraparound of SSB.
- each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by using two or more physically or logically separated devices). , Wired, wireless, etc.) and may be realized using these plurality of devices.
- the functional block may be realized by combining the software with the one device or the plurality of devices.
- the functions include judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection, establishment, comparison, assumption, expectation, and deemed. , Broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc.
- a functional block (constituent unit) for functioning transmission may be referred to as a transmitting unit (transmitting unit), a transmitter (transmitter), or the like.
- the method of realizing each of them is not particularly limited.
- the base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure.
- FIG. 14 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like. ..
- the hardware configuration of the 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.
- processor 1001 may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed simultaneously, sequentially, or by using other methods by two or more processors.
- the processor 1001 may be mounted by one or more chips.
- the processor 1001 For each function of the 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 operation and communicates via the communication device 1004. It is realized by controlling at least one of reading and writing of data in the memory 1002 and the storage 1003.
- predetermined software program
- 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 peripheral devices, a control device, an arithmetic unit, registers, and the like.
- CPU central processing unit
- control unit 110 210
- transmission / reception unit 120 220
- the like may be realized by the processor 1001.
- the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these.
- a program program code
- the control unit 110 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, for example, at least a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), or any 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 implement the wireless communication method according to the embodiment of the present disclosure.
- the storage 1003 is a computer-readable recording medium, for example, a flexible disk, a floppy (registered trademark) disk, a magneto-optical disk (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disk, etc.). At least one of Blu-ray® disks, removable disks, hard disk 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 communicating between computers via at least one of a wired network and a 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 at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)). It may be configured to include.
- the transmission / reception unit 120 (220), the transmission / reception antenna 130 (230), and the like described above may be realized by the communication device 1004.
- the transmission / reception unit 120 (220) may be physically or logically separated from the transmission unit 120a (220a) and the reception unit 120b (220b).
- 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, a Light Emitting Diode (LED) 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).
- each device such as the processor 1001 and the memory 1002 is connected by the 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.
- the base station 10 and the user terminal 20 include a microprocessor, a digital signal processor (Digital Signal Processor (DSP)), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), 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.
- DSP Digital Signal Processor
- ASIC Application Specific Integrated Circuit
- PLD Programmable Logic Device
- FPGA Field Programmable Gate Array
- the terms described in the present disclosure and the terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings.
- channels, symbols and signals may be read interchangeably.
- the signal may be a message.
- the reference signal may also be abbreviated as RS, and may be referred to as a pilot, a pilot signal, or the like depending on the applied standard.
- the component carrier Component Carrier (CC)
- CC Component Carrier
- the wireless frame may be composed of one or more 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.
- the subframe may be composed of one or more slots in the time domain.
- the subframe may have a fixed time length (eg, 1 ms) that is independent of numerology.
- the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel.
- Numerology includes, for example, subcarrier spacing (SubCarrier Spacing (SCS)), bandwidth, symbol length, cyclic prefix length, transmission time interval (Transmission Time Interval (TTI)), number of symbols per TTI, and wireless frame configuration.
- SCS subcarrier Spacing
- TTI Transmission Time Interval
- a specific filtering process performed by the transmitter / receiver in the frequency domain, a specific windowing process performed by the transmitter / receiver in the time domain, and the like may be indicated.
- the slot may be composed of one or more symbols (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain.
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may be a time unit based on numerology.
- a slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Further, the mini slot may be called a sub slot. A minislot may consist of a smaller number of symbols than the slot.
- a PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as a PDSCH (PUSCH) mapping type A.
- the PDSCH (or PUSCH) transmitted using the minislot may be referred to as PDSCH (PUSCH) mapping type B.
- the wireless frame, subframe, slot, minislot and symbol all represent the time unit when transmitting a signal.
- the radio frame, subframe, slot, minislot and symbol may have different names corresponding to each.
- the time units such as frames, subframes, slots, mini slots, and symbols in the present disclosure may be read as each other.
- one subframe may be called TTI
- a plurality of consecutive subframes may be called TTI
- one slot or one minislot may be called TTI. That is, at least one of the subframe and 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. It may be.
- the unit representing TTI may be called a slot, a mini slot, or the like instead of a subframe.
- TTI refers to, for example, the minimum time unit of scheduling in wireless communication.
- the 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), code block, codeword, or the like, or may be a processing unit of scheduling, link adaptation, or the like.
- the time interval for example, the number of symbols
- the transport block, code block, code word, etc. may be shorter than the TTI.
- one or more TTIs 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 3GPP Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, or the like.
- TTIs shorter than normal TTIs may be referred to as shortened TTIs, short TTIs, partial TTIs (partial or fractional TTIs), shortened subframes, short subframes, minislots, subslots, slots, and the like.
- a long TTI (eg, normal TTI, subframe, etc.) may be read as a TTI having a time length of more than 1 ms, and a short TTI (eg, 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 is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain.
- the number of subcarriers contained in the RB may be the same regardless of the numerology, and may be, for example, 12.
- the number of subcarriers contained in the RB may be determined based on numerology.
- the RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini slot, 1 subframe or 1 TTI.
- Each 1TTI, 1 subframe, etc. may be composed of one or a plurality of resource blocks.
- one or more RBs are a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, and an RB. It may be called a pair or the like.
- PRB Physical RB
- SCG sub-carrier Group
- REG resource element group
- PRB pair an RB. It may be called a pair or the like.
- the resource block may be composed of one or a plurality of resource elements (Resource Element (RE)).
- RE Resource Element
- 1RE may be a radio resource area of 1 subcarrier and 1 symbol.
- Bandwidth Part (which may also be called partial bandwidth) represents a subset of consecutive common resource blocks (RBs) for a neurology in a carrier. May be good.
- the common RB may be specified by the index of the RB based on the common reference point of the carrier.
- PRBs may be defined in a BWP and numbered within that BWP.
- the BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL).
- BWP UL BWP
- BWP for DL DL BWP
- One or more BWPs may be set in one carrier for the UE.
- At least one of the configured BWPs may be active, and the UE may not expect to send or receive a given signal / channel outside the active BWP.
- “cell”, “carrier” and the like in this disclosure may be read as “BWP”.
- the above-mentioned structures such as wireless frames, subframes, slots, mini slots, and symbols are merely examples.
- 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 other configurations can be changed in various ways.
- radio resources may be indicated by a given index.
- the information, signals, etc. described in this disclosure may be represented using any of a variety of different techniques.
- 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.
- information, signals, etc. can be output from the upper layer to the lower layer and from the lower layer to at least one of the upper layers.
- Information, signals, etc. may be input / output via a plurality of network nodes.
- the input / output information, signals, etc. may be stored in a specific location (for example, 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 mode / embodiment described in the present disclosure, and may be performed by using another method.
- the notification of information in the present disclosure includes physical layer signaling (for example, downlink control information (DCI)), uplink control information (Uplink Control Information (UCI))), and higher layer signaling (for example, Radio Resource Control). (RRC) signaling, broadcast information (master information block (MIB), system information block (SIB), etc.), medium access control (MAC) signaling), other signals or combinations thereof May be carried out by.
- DCI downlink control information
- UCI Uplink Control Information
- RRC Radio Resource Control
- MIB master information block
- SIB system information block
- MAC medium access control
- the physical layer signaling may be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), and the like.
- the RRC signaling may be called an RRC message, and may be, for example, an RRC connection setup (RRC Connection Setup) message, an RRC connection reconfiguration (RRC Connection Reconfiguration) message, or the like.
- MAC signaling may be notified using, for example, a MAC control element (MAC Control Element (CE)).
- CE MAC Control Element
- the notification of predetermined information 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 is an instruction, instruction set, code, code segment, program code, program, subprogram, software module, whether called software, firmware, middleware, microcode, hardware description language, or another name.
- Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, features, etc. should be broadly interpreted to mean.
- software, instructions, information, etc. may be transmitted and received via a transmission medium.
- a transmission medium For example, a website where software uses at least one of wired technology (coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twist pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- Network may mean a device (eg, a base station) included in the network.
- precoding "precoding weight”
- QCL Quality of Co-Co-Location
- TCI state Transmission Configuration Indication state
- space "Spatial relation”, “spatial domain filter”, “transmission power”, “phase rotation”, "antenna port”, “antenna port group”, “layer”, “number of layers”
- Terms such as “rank”, “resource”, “resource set”, “resource group”, “beam”, “beam width”, “beam angle”, "antenna”, “antenna element", “panel” are compatible.
- Base station BS
- radio base station fixed station
- NodeB NodeB
- eNB eNodeB
- gNB gNodeB
- Access point "Transmission point (Transmission Point (TP))
- RP Reception point
- TRP Transmission / Reception Point
- Panel , "Cell”, “sector”, “cell group”, “carrier”, “component carrier” and the like
- Base stations are sometimes referred to by terms such as macrocells, small cells, femtocells, and picocells.
- the base station can accommodate one or more (for example, three) cells.
- 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 (Remote Radio)).
- Communication services can also be provided by Head (RRH))).
- RRH Head
- the term "cell” or “sector” refers to part or all of the coverage area of at least one of the base stations and base station subsystems that provide communication services in this coverage.
- MS mobile station
- UE user equipment
- terminal terminal
- Mobile stations include 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 terminals, remote terminals. , Handset, user agent, mobile client, client or some other suitable term.
- At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, or the like.
- At least one of the base station and the mobile station may be a device mounted on the mobile body, the mobile body itself, or the like.
- the moving body may be a vehicle (eg, car, airplane, etc.), an unmanned moving body (eg, drone, self-driving car, etc.), or a robot (manned or unmanned). ) May be.
- At least one of the base station and the mobile station also includes a device that does not necessarily move during communication operation.
- at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.
- IoT Internet of Things
- the base station in the present disclosure may be read by the user terminal.
- communication between a base station and a user terminal has been replaced with communication between a plurality of user terminals (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.).
- D2D Device-to-Device
- V2X Vehicle-to-Everything
- Each aspect / embodiment of the present disclosure may be applied to the configuration.
- the user terminal 20 may have the function of the base station 10 described above.
- words such as "up” and “down” may be read as words corresponding to inter-terminal communication (for example, "side").
- the uplink channel and the downlink channel may be replaced with the side channel.
- the user terminal in the present disclosure may be read as a base station.
- the base station 10 may have the functions of the user terminal 20 described above.
- the operation performed by the base station may be performed by its upper node (upper node) in some cases.
- various operations performed for communication with a terminal are performed by the base station and one or more network nodes other than the base station (for example,).
- Mobility Management Entity (MME), Serving-Gateway (S-GW), etc. can be considered, but it is not limited to these), or it is clear that it can be performed by a combination thereof.
- each aspect / embodiment described in the present disclosure may be used alone, in combination, or switched with execution. Further, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be changed as long as there is no contradiction. For example, the methods described in the present disclosure present elements of various steps using exemplary order, and are not limited to the particular order presented.
- 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
- Future Radio Access FAA
- New-Radio Access Technology RAT
- NR New Radio
- NX New radio access
- Future generation radio access FX
- GSM Global System for Mobile communications
- CDMA2000 Code Division Multiple Access
- UMB Ultra Mobile Broadband
- IEEE 802.11 Wi-Fi (registered trademark)
- IEEE 802.16 WiMAX (registered trademark)
- a plurality of systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).
- references to elements using designations such as “first”, “second”, etc. as used in this disclosure does not generally limit the quantity or order of those elements. These designations can be used in the present disclosure 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 employed or that the first element must somehow precede the second element.
- determining used in this disclosure may include a wide variety of actions.
- judgment (decision) means judgment (judging), calculation (calculating), calculation (computing), processing (processing), derivation (deriving), investigation (investigating), search (looking up, search, inquiry) ( For example, searching in a table, database or another data structure), ascertaining, etc. may be considered to be "judgment”.
- judgment (decision) means receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), access (for example). It may be regarded as “judgment (decision)" of "accessing” (for example, accessing data in memory).
- judgment (decision) is regarded as “judgment (decision)” such as resolution, selection, selection, establishment, and comparison. May be good. That is, “judgment (decision)” may be regarded as “judgment (decision)” of some action.
- connection are any direct or indirect connection or connection between two or more elements. Means, and can include the presence of one or more intermediate elements between two elements that are “connected” or “joined” 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”.
- the radio frequency domain microwaves. It can be considered to be “connected” or “coupled” to each other using frequency, electromagnetic energy having wavelengths in the light (both visible and invisible) regions, and the like.
- the term “A and B are different” may mean “A and B are different from each other”.
- the term may mean that “A and B are different from C”.
- Terms such as “separate” and “combined” may be interpreted in the same way as “different”.
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Abstract
Description
アンライセンスバンド(例えば、2.4GHz帯、5GHz帯、6GHz帯)では、例えば、Wi-Fiシステム、LAAをサポートするシステム(LAAシステム)等の複数のシステムが共存することが想定されるため、当該複数のシステム間での送信の衝突回避及び/又は干渉制御が必要となると考えられる。
NRでは、同期信号/ブロードキャストチャネル(Synchronization Signal/Physical Broadcast Channel(SS/PBCH))ブロックが利用される。SS/PBCHブロックは、プライマリ同期信号(Primary Synchronization Signal(PSS))、セカンダリ同期信号(Secondary Synchronization Signal(SSS))及びブロードキャストチャネル(Physical Broadcast Channel(PBCH))(及びPBCH用の復調用参照信号(DeModulation Reference Signal(DMRS)))を含む信号ブロックであってもよい。SS/PBCHブロックは、同期信号ブロック(Synchronization Signal Block(SSB))と呼ばれてもよい。
・システムフレーム番号(System Frame Number(SFN))の下位4ビット(4ビット)、
・ハーフフレームビット(1ビット)、
・ssb-SubcarrierOffset(kSSB)の上位1ビット(1bit)、
・Reserved(2ビット)。
NR-Uでは、発見参照信号(Discovery Reference Signal(DRS)、NR-U DRSなど)の利用が検討されている。DRSは、時間的に連続する信号であって、1つ以上のSSBのセットと、当該1つ以上のSSBに関連付けられたCORESET及びPhysical Downlink Shared Channel(PDSCH)と、を含む信号であってもよい。DRSは、Channel State Information(CSI)-Reference Signal(RS)を含んでもよい。また、DRS号は、発見用参照信号、発見信号(Discovery Signal(DS))などと呼ばれてもよい。
(1)DMRS系列とPBCHペイロードの組み合わせ、
(2)DMRS系列のみ、
(3)PBCHペイロードのみ、
(4)DMRS系列と、DMRS-セカンダリ同期信号(Secondary Synchronization Signal(SSS))間の位相差と、の組み合わせ。
ここまで述べたように、フレームタイミング導出のために必要となる情報(例えば、ラップアラウンドの単位の情報、グループインデックスの情報及びバースト開始位置インデックスの情報の少なくとも1つ)をPBCHペイロードに含めることによって、検出したSSBの候補位置を特定することが検討されている。しかしながら、PBCHのうちMIBはPBCH TTI内で一定でなければならない。これを考慮して、ラップアラウンドの単位などの情報をPBCHペイロードに具体的にどのような構成で含めるかについては、まだ検討されていない。
<第1の実施形態>
第1の実施形態では、NR-Uキャリアにおいては、SSB(DRS)送信周期として所定の値(例えば、20ms)より短い値(例えば、5ms、10msなど)が利用される(又は設定される)ことを、UEは想定しなくてもよい。
第2の実施形態は、NR-UキャリアにおけるPBCHペイロードに、フレームタイミング導出のために必要となる情報をどのように含めるかに関する。
ラップアラウンドの単位は、既に述べたように、候補位置インデックスと実効SSBインデックスとのマッピングを決めるパラメータであり、DRS送信ウィンドウ内では変わらない値に該当する。このため、ラップアラウンドの単位はMIBに含めることが好ましい。
グループインデックスは、既に述べたように、何回目のラップアラウンドに相当する候補位置かを示すパラメータであり、DRS送信ウィンドウ内で変化する。このため、グループインデックスは、PBCHペイロードのうちMIBではない部分に含めることが好ましい。
バースト開始位置インデックスは、既に述べたように、SSB(DRS)のバーストの送信を開始した候補位置インデックスを示すパラメータであり、DRS送信ウィンドウ内で変化する。このため、バースト開始位置インデックスは、PBCHペイロードのうちMIBではない部分に含めることが好ましい。
なお、ここまで、ラップアラウンドの単位は、SSBに適用されるビームの数(実効SSBインデックスの取り得る値の数)と同じであり、使用するPBCHのDMRSの系列数と一致すると想定していた。しかしながら、本開示のラップアラウンドの単位は、PBCHのDMRSの系列数と異なってもよい。例えば、同じ実効SSBインデックスのSSB(DRS)に対して、異なるDMRS系列が用いられてもよい。
以下、本開示の一実施形態に係る無線通信システムの構成について説明する。この無線通信システムでは、本開示の上記各実施形態に係る無線通信方法のいずれか又はこれらの組み合わせを用いて通信が行われる。
図12は、一実施形態に係る基地局の構成の一例を示す図である。基地局10は、制御部110、送受信部120、送受信アンテナ130及び伝送路インターフェース(transmission line interface)140を備えている。なお、制御部110、送受信部120及び送受信アンテナ130及び伝送路インターフェース140は、それぞれ1つ以上が備えられてもよい。
図13は、一実施形態に係るユーザ端末の構成の一例を示す図である。ユーザ端末20は、制御部210、送受信部220及び送受信アンテナ230を備えている。なお、制御部210、送受信部220及び送受信アンテナ230は、それぞれ1つ以上が備えられてもよい。
なお、上記実施形態の説明に用いたブロック図は、機能単位のブロックを示している。これらの機能ブロック(構成部)は、ハードウェア及びソフトウェアの少なくとも一方の任意の組み合わせによって実現される。また、各機能ブロックの実現方法は特に限定されない。すなわち、各機能ブロックは、物理的又は論理的に結合した1つの装置を用いて実現されてもよいし、物理的又は論理的に分離した2つ以上の装置を直接的又は間接的に(例えば、有線、無線などを用いて)接続し、これら複数の装置を用いて実現されてもよい。機能ブロックは、上記1つの装置又は上記複数の装置にソフトウェアを組み合わせて実現されてもよい。
なお、本開示において説明した用語及び本開示の理解に必要な用語については、同一の又は類似する意味を有する用語と置き換えてもよい。例えば、チャネル、シンボル及び信号(シグナル又はシグナリング)は、互いに読み替えられてもよい。また、信号はメッセージであってもよい。参照信号(reference signal)は、RSと略称することもでき、適用される標準によってパイロット(Pilot)、パイロット信号などと呼ばれてもよい。また、コンポーネントキャリア(Component Carrier(CC))は、セル、周波数キャリア、キャリア周波数などと呼ばれてもよい。
Claims (6)
- 所定のキャリアにおいて、Release 15 New Radio(NR)で規定されるマスタ情報ブロック(Master Information Block(MIB))以外のPhysical Broadcast CHannel(PBCH)ペイロードに含まれる所定の情報を含まないPBCHを含む、同期信号ブロック(Synchronization Signal Block(SSB))を受信する受信部と、
前記所定の情報の値は所定の値であると想定する制御部と、を有することを特徴とするユーザ端末。 - 前記所定の情報は、ハーフフレームビットであることを特徴とする請求項1に記載のユーザ端末。
- 前記所定の情報は、ssb-SubcarrierOffsetの上位1ビットであることを特徴とする請求項1に記載のユーザ端末。
- 前記所定の情報は、システムフレーム番号の下位4ビットのうち、所定数のビットであることを特徴とする請求項1に記載のユーザ端末。
- 前記制御部は、前記PBCHのマスタ情報ブロックに含まれる共通の制御リソースセット、共通のサーチスペース及び必要なPhysical Downlink Control Channel(PDCCH)パラメータを決定するための情報に基づいて、前記SSBのラップアラウンドの単位の値を取得することを特徴とする請求項1から請求項4のいずれかに記載のユーザ端末。
- 所定のキャリアにおいて、Release 15 New Radio(NR)で規定されるマスタ情報ブロック(Master Information Block(MIB))以外のPhysical Broadcast CHannel(PBCH)ペイロードに含まれる情報を含まないPBCHを含む、同期信号ブロック(Synchronization Signal Block(SSB))を受信するステップと、
前記所定の情報の値は所定の値であると想定するステップと、を有することを特徴とするユーザ端末の無線通信方法。
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