WO2021059524A1 - 端末及び無線通信方法 - Google Patents
端末及び無線通信方法 Download PDFInfo
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- WO2021059524A1 WO2021059524A1 PCT/JP2019/038334 JP2019038334W WO2021059524A1 WO 2021059524 A1 WO2021059524 A1 WO 2021059524A1 JP 2019038334 W JP2019038334 W JP 2019038334W WO 2021059524 A1 WO2021059524 A1 WO 2021059524A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/08—Testing, supervising or monitoring using real traffic
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/26025—Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/04—Wireless resource allocation
- H04W72/044—Wireless resource allocation based on the type of the allocated resource
- H04W72/0453—Resources in frequency domain, e.g. a carrier in FDMA
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
Definitions
- the present disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems.
- 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.
- PDCCH Physical Downlink Control Channel
- CCE Control Channel Elements
- one of the purposes of the present disclosure is to provide a terminal and a wireless communication method capable of performing appropriate monitoring even when the PDCCH monitoring span is used together with carrier aggregation.
- the terminal includes a control unit that determines a span pattern including a span for monitoring a downlink control channel (Physical Downlink Control Channel (PDCCH)) based on a monitoring opportunity, and the span pattern. It has a receiving unit that monitors PDCCH candidates based on the above, and the control unit determines the span pattern of each component carrier based on a certain assumption regarding the span pattern of a plurality of component carriers.
- a control unit that determines a span pattern including a span for monitoring a downlink control channel (Physical Downlink Control Channel (PDCCH)) based on a monitoring opportunity, and the span pattern.
- PDCCH Physical Downlink Control Channel
- appropriate monitoring can be performed even when the PDCCH monitoring span is used together with carrier aggregation.
- FIG. 1 is a diagram showing an example of a span and a span pattern.
- FIG. 2 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.
- FIG. 3 is a diagram showing an example of the configuration of the base station according to the embodiment.
- FIG. 4 is a diagram showing an example of the configuration of the user terminal according to the embodiment.
- FIG. 5 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- SCS SubCarrier Spacing
- the numerology may be associated with a predetermined index ⁇ .
- the maximum number of decodings for example, Blind Decoding (BD)
- BD Blind Decoding
- the maximum number of BDs may be read as the maximum number of PDCCH candidates monitored by the UE, the upper limit of the number of BDs, and the like.
- Control Channel Element (CCE) Control Channel Element per slot of one serving cell.
- the maximum number of CCEs may be read as the upper limit of the number of CCEs, and the like.
- the upper limit of the number of BDs and the upper limit of the number of CCEs for the Downlink Bandwidth Part (DL BWP) having the SCS setting ⁇ are the above M max, respectively.
- the UE may report capability information (upper layer parameter “pdcch-BlindDetectionCA”) indicating that it has the ability to monitor PDCCH candidates for N cap cells downlink cells to the base station.
- N cap cells may be an integer of 4 or more.
- N DL and ⁇ cells may correspond to the number of set downlink cells (which may be referred to as Component Carrier (CC)) including DL BWP having SCS setting ⁇ .
- CC Component Carrier
- N DL, ⁇ cells N DL, ⁇ cells
- the upper limit of the number of BDs per certain SCS setting ⁇ and per slot may be min (M max, slot, ⁇ PDCCH , M total, slot, ⁇ PDCCH ). Further, the upper limit of the number of CCEs per certain SCS setting ⁇ and per slot may be min (C max, slot, ⁇ PDCCH , C total, slot, ⁇ PDCCH ).
- the upper limit of the conventional BD number / CCE number shown above was a value for each slot. However, considering use cases such as Ultra Reliable and Low Latency Communications (URLLC), it is preferable that the upper limit of the number of BDs / CCEs is defined in shorter units rather than in slot units. ..
- Orthogonal Frequency Division Multiplexing (OFDM) symbol-based or span-based monitoring capability (upper limit of BD number / CCE number) is being examined.
- a PDCCH monitoring span (which may also be referred to simply as span, MS, etc.) has two consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols up to Y (ie, less than or equal to Y) and the start of two spans.
- the minimum time interval between may be defined as the X symbol.
- the term "span" in the present disclosure is read as a symbol set for PDCCH monitoring, a symbol set, a period based on the PDCCH monitoring opportunity (Monitoring Offset (MO)) (or a period derived based on MO), and the like. May be good.
- Each span may be included in one slot. Also, the spans do not have to overlap each other.
- the configuration of spans in one slot or in a plurality of slots may be referred to as a span pattern.
- the span pattern may be read as at least one such as a span combination, a span set, and a span group.
- the same span pattern may be repeated in each slot, or the same span pattern may be repeated in units of a plurality of slots.
- the time difference between the start position (symbol) of the span and the start position of the adjacent (for example, subsequent or previous) span may be expressed as x.
- the length of one span (in other words, duration) may be expressed as y.
- the length y of one span (in other words, the duration of the span) y is the maximum of the maximum of all CORESET lengths and the minimum of the Y candidate values reported by the UE. It may be a value.
- the last span in the slot is smaller than this length (the maximum value of all the CORESET lengths and the minimum value of the Y candidate values reported by the UE). May be good.
- the spacing between consecutive spans does not have to be equal, but all spans contained in a span pattern must meet the same (X, Y) limit. That is, the UE may determine the span pattern so that x ⁇ X and y ⁇ Y are satisfied for any span of a certain span pattern.
- the PDCCH monitoring opportunity (Monitoring Offset (MO)) may be completely included in one span.
- a particular PDCCH monitoring if the sequence of spans (in other words, the span pattern) meets at least one gap interval in each slot (including cross-slot boundaries) in the set of candidate values (X, Y) reported by the UE.
- the setting may be said to meet the limits of UE capability.
- the UE may transmit a set of candidate values of (X, Y) as UE capability information using a higher layer parameter (for example, the RRC parameter "pdcch-MonitoringAnyOccasionsWithSpanGap").
- a higher layer parameter for example, the RRC parameter "pdcch-MonitoringAnyOccasionsWithSpanGap”
- set 2 ⁇ (4, 3), (7, 3) ⁇
- set 3 ⁇ (2, 2).
- the number of different start symbol indexes (indices) for all MOs per slot does not have to be greater than floor (14 / ⁇ minimum of X candidate values reported by the UE ⁇ ).
- floor (A) means the floor function of A.
- FIG. 1 is a diagram showing an example of a span and a span pattern.
- the UE reports the above set 3 as a set of candidate values of (X, Y).
- the UE is set with MO settings corresponding to MO1 and MO2, and FIG. 1 shows the timing of MO for each of these settings.
- MO1 corresponds to the symbols # 1, # 5, # 10 of slot # 0 and the symbols # 1, # 3, # 8, # 13 of slot # 1.
- MO2 corresponds to the symbols # 1, # 2, and # 6 of slot # 0. In this example, it is assumed that the MOs in slots other than slot # 0 and slot # 1 have positions in the slots that overlap with any of these symbols.
- the UE may determine that if the symbol of any slot is part of at least one MO, that symbol is part of a span.
- the UE has a set of MOs (here, MO1 and MO2) set to have the same span pattern in all slots, a set of reported (X, Y) candidate values (here, set 3), and The starting position and length of one or more spans of each slot is determined based on.
- the UE creates a span pattern so that x ⁇ X and y ⁇ Y are satisfied by using (X, Y) selected in a specific order from the set of candidate values of (X, Y). You may try to do it. If the span pattern can be created, the UE may use the span pattern, and if the span pattern cannot be created, the UE may try to create the span pattern by using the following (X, Y).
- the specific order may be, for example, ascending order of X (trial in order from the smallest X) or descending order (trial in order from the largest X).
- the symbols constituting the span include at least the symbols corresponding to any MO (that is, symbols # 1, # 2, # 3, # 5, # 6, # 8, # 10, # 13). Including.
- a span pattern including 6 spans (spans # 0- # 5) in one slot could be created.
- span # 0 corresponds to symbols # 1 and # 2
- span # 1 corresponds to symbols # 3 and # 4
- span # 2 corresponds to symbols # 5 and # 6
- span # 3 corresponds to symbols.
- span # 8 and # 9 corresponds to symbols # 10 and # 11
- span # 5 corresponds to symbol # 13. Note that this span pattern is an example, and different span patterns may be created under the same conditions.
- this combination (may be expressed as C (X, Y)) may be called valid. Also, of the valid combinations, the largest C may be applied.
- the UE is a Rel.
- URLLC Physical Downlink Control Channel
- PDCCH monitoring based on 16 capabilities may be configured. The UE reported Rel. PDCCH for eMBB was monitored and reported according to 15 capabilities.
- PDCCH for URLLC may be monitored according to 16 capabilities.
- the UE is Rel. 15 abilities and Rel.
- PDCCH monitoring for both eMBB and URLLC may be configured based on any one of the 16 capabilities.
- the base station may set which capabilities are used for the UE.
- the upper limit C of the maximum number of non-overlapping CCEs for channel estimation per monitoring span may be the same across different spans within a slot.
- Each span for 16 may cover at least one of a UE-specific search space set and a common search space set for URLLC.
- the value of the upper limit C is Rel. The value is not limited to the value specified in 15, and may be smaller, the same, or larger than the value.
- the present inventors have conceived a method for carrying out appropriate monitoring even when the PDCCH monitoring span is used together with carrier aggregation.
- the index ⁇ related to numerology can take a value of 0 or more and 3 or less, but the value of ⁇ is not limited to this.
- ⁇ can take a value of 0 or more and N or less (N is an integer)
- N is an integer
- an embodiment in which the constant “3” relating to ⁇ of the present disclosure is replaced with “N” may be applied.
- the first embodiment relates to a span pattern when a plurality of CCs are set in the UE.
- CC may be read as a cell, a carrier, and the like.
- the span pattern may be the same over all CCs.
- the span pattern may be different for a plurality of CCs.
- the span pattern may be different whenever the CCs are different, or may be different if the CCs are different and certain conditions are met.
- the particular condition may meet at least one of the following: (1) The frequency range (Frequency Range (FR)) of each of the plurality of CCs is different. (2) The frequency bands of each of the multiple CCs are different. (3) The cell group to which each of the multiple CCs belongs is different. (4) The numerology (for example, subcarrier interval) of each of the plurality of CCs is different.
- FR Frequency Range
- a span pattern (7, 3) may be used for carrier # 0 in FR1 and another span pattern (4, 3) may be used for carrier # 1 in FR2. ..
- a span pattern (7, 3) is used for carrier # 0 in band n1
- another span pattern (4, 3) is used for carrier # 1 in band n2.
- n1 and n2 may indicate a band index for identifying a band.
- the span pattern (7, 3) is used for carrier # 0 in the master cell group (or cell group # 0), and carrier # 1 in the secondary cell group (or cell group # 1).
- another span pattern (4, 3) may be used.
- another span pattern (4, 3) may be used.
- the UE may determine the span pattern of each CC based on certain assumptions about the span patterns of a plurality of CCs.
- the UE may determine the span pattern of each CC based on the assumption that the span pattern corresponds to at least one of the span patterns described above in the first embodiment.
- the UE determines the span pattern for one CC among the plurality of CCs, and uses the determined span pattern as the span pattern of the other CCs. You may use it.
- the UE assumes that the span patterns of a plurality of CCs are different when a specific condition is satisfied, for one or more CCs having the specific condition (for example, CCs having different FRs) among the plurality of CCs. May determine the span pattern individually for the one or more CCs. For one or more CCs that do not meet the specific conditions among the plurality of CCs (for example, CCs having the same FR), a span pattern is determined for one CC among the one or more CCs, and the remaining CCs. The determined span pattern may be used as the CC span pattern.
- the UE can appropriately determine the span pattern of each CC.
- the second embodiment relates to the upper limit C of the maximum number of non-overlapping CCEs.
- the second embodiment is a slot-based CA limitation based on the upper limit of the number of CCEs per slot, C total, slot, ⁇ PDCCH (may be simply referred to as a slot-based CA limitation) (Embodiment 2-1). And the upper limit of the number of CCEs per span C total, slot, ⁇ PDCCH, span unit-based CA limitation based on span (may be simply called span-based CA limitation) (Embodiment 2-2). It is roughly divided.
- non-CA restrictions restrictions for each serving cell
- C max, slot, ⁇ PDCCH (slot-based non-CA limit) as in 15 may be applied, or C which is the maximum number of non-overlapping CCEs per certain SCS setting ⁇ and per span (upper limit of the number of CCEs).
- max, slot, ⁇ PDCCH, span (span-based non-CA limit) may be applied, or C max, which is the maximum number of non-overlapping CCEs per SCS setting ⁇ and per CC of CC index i and per span.
- Slots, ⁇ , i PDCCH, span (span-based non-CA restrictions) may be applied.
- C total, slot, ⁇ PDCCH, span may be expressed as C total, span, ⁇ PDCCH , or may be expressed in other notations.
- C max, slot, ⁇ (, i) PDCCH, span may be expressed as C max, span, ⁇ (, i) PDCCH , or may be expressed in other notations.
- C max, slot, ⁇ (, i) PDCCH, span may have the same value applied or different values applied to multiple spans within a span pattern or slot (eg, spans). Different values may be applied depending on the corresponding (x, y)). The same applies to C total, slot, ⁇ PDCCH, and span.
- Whether to use the slot-based non-CA limit or the span-based non-CA limit as the non-CA limit may be determined in advance by the specifications, or may be set by higher layer signaling or the like for the UE.
- 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
- Whether to use the slot-based non-CA limit or the span-based non-CA limit as the non-CA limit may differ for each numerology (SCS).
- SCS numerology
- the UE applies, for example, a span-based non-CA limit for relatively small ⁇ (eg, ⁇ ⁇ 1) and a slot-based non-CA limit for other ⁇ (eg, ⁇ ⁇ 2). It may be set to apply, or it may be determined as such.
- At least one of the SCS-based restrictions (Embodiment 2-1-1) and the CC-based restrictions (Embodiment 2-1-2) may be applied.
- this SCS-based limitation may mean that the same C max, slot, ⁇ PDCCH , C total, slot, ⁇ PDCCH, etc. are applied to different CCs.
- This CC-based limitation may also mean that different C max, slot, ⁇ PDCCH , C total, slot, ⁇ PDCCH, etc. are applied to different CCs.
- This CC-based limitation may mean an SCS and CC-based limitation.
- C max, slot, ⁇ PDCCH, the average value of the span is, C max of a plurality of CC, slot, ⁇ PDCCH, may mean an average value of the span, at a single CC, 1 slot C max, slot, mu PDCCH inner, may mean an average value of the span, in a plurality of CC, C max within 1 slot, slot, mu PDCCH, may mean an average value of span.
- C total, slot, ⁇ PDCCH may be obtained by applying the above-mentioned C max, slot, ⁇ PDCCH to Equation 2.
- the non-CA limitation is described in Rel. It may be a non-CA limit of 15 (slot-based non-CA limit) or a span-based non-CA limit.
- the span pattern may be determined based on (4) of the first embodiment.
- the upper limit of the number of CCEs per certain SCS setting ⁇ , per CC, and per slot may be min (C max, slot, ⁇ , i PDCCH , C total, slot, ⁇ , i PDCCH ).
- i is the index of CC.
- the C total, slot, ⁇ , i PDCCH may be obtained by the following formula 3.
- N DL, ⁇ , i cells may mean the number of cells (for example, 1) whose CC index corresponds to i among the downlink cells including the DL BWP having the SCS setting ⁇ .
- a specific CC for example, CC with the smallest CC index and CC with the largest CC index among the settings
- the average value of C max, slot, ⁇ , i PDCCH, and span of all serving cells may be calculated by the following equation 4.
- the non-CA limitation is described in Rel. It may be a non-CA limit of 15 (slot-based non-CA limit) or a span-based non-CA limit.
- the span pattern may be determined based on at least one rule of the first embodiment.
- Span-based CA restrictions may apply to SCSs with span-based non-CA restrictions.
- the span-based CA limitation at least one of the SCS-based limitation (Embodiment 2-2-1) and the CC-based limitation (Embodiment 2-2-2) may be applied.
- this SCS-based limitation may mean that the same C max, slot, ⁇ PDCCH, span , C total, slot, ⁇ PDCCH, span, etc. are applied to different CCs.
- This CC-based limitation may also mean that different C max, slot, ⁇ PDCCH, span , C total, slot, ⁇ PDCCH, span, etc. are applied to different CCs.
- This CC-based limitation may mean an SCS and CC-based limitation.
- the upper limit of the number of CCEs per certain SCS setting ⁇ and per span may be min (C max, slot, ⁇ PDCCH, span , C total, slot, ⁇ PDCCH, span ).
- the C total, slot, ⁇ PDCCH, and span may be obtained by the following formula 5.
- the upper limit of the number of CCEs per span for the cell of the cell index i C total, slot, ⁇ , i PDCCH, span may be derived by the following formula 6.
- the C total, slot, ⁇ , i PDCCH, and span may be derived using the formula 7 that summarizes the formulas 5 and 6.
- the UE has an upper limit on the number of CCEs per span considering all CCs.
- the number of CCEs to be monitored in each CC may be determined based on C total, slot, ⁇ , i PDCCH, and span.
- the non-CA limitation is described in Rel. It may be a non-CA limit of 15 (slot-based non-CA limit) or a span-based non-CA limit.
- the span pattern may be determined based on (4) of the first embodiment.
- N DL, ⁇ , i cells may mean the number of cells (for example, 1) whose CC index corresponds to i among the downlink cells including the DL BWP having the SCS setting ⁇ .
- C total, slot, ⁇ , i PDCCH, and span may be obtained by the following equation 9.
- the UE may select N cap cells of CC indexes that correspond to any of the following: -N cap cells CC index from the smallest (or largest) of C max, slot, ⁇ , i PDCCH, span of all serving cells, -Of the set CC indexes, N cap cells CC indexes from the smallest (or largest) one.
- the non-CA limitation is described in Rel. It may be a non-CA limit of 15 (slot-based non-CA limit) or a span-based non-CA limit.
- the span pattern may be determined based on at least one rule of the first embodiment.
- the UE can appropriately determine the CA limit regarding the number of CCEs.
- the upper limit of the number of CCEs is read as the upper limit of the number of BDs, and any parameter C * (for example, C total, slot, ⁇ PDCCH , C max, slot, ⁇ , i PDCCH, span, etc.) regarding the upper limit of the number of CCEs is set.
- the present disclosure also covers the CA limitation on M by reading the corresponding parameters M * on the upper limit of the number of BDs (eg, M total, slot, ⁇ PDCCH , M max, slot, ⁇ , i PDCCH, span, etc.).
- the UE in which PDCCH monitoring based on the capability (Rel.15) for eMBB and PDCCH monitoring based on the capability (Rel.16) for URLLC are set is related to monitoring related to the URLLC service. May determine the upper limit of the number of CCEs and the upper limit of the number of BDs according to the second embodiment (and its replacement), and for monitoring the eMBB service, Rel. The upper limit of the number of CCEs and the upper limit of the number of BDs may be determined according to the 15 rules.
- the UE is Rel. 15 abilities and Rel. UEs configured for both eMBB and URLLC PDCCH monitoring based on one of the 16 capabilities will CCE according to a second embodiment (and its replacement) for monitoring for both URLLC and eMBB services.
- the upper limit of the number and the upper limit of the number of BDs may be determined.
- 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. 2 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 Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)).
- MR-DC is dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), 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 base station (gNB) of NR is MN
- the base station (eNB) of LTE (E-UTRA) 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 an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to a relay station (relay) is 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.
- 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.
- the Master Information Block (MIB) may be transmitted by the PBCH.
- 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 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, it may be called Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.
- scheduling request (Scheduling Request () Uplink Control Information (UCI) including at least one of SR)
- 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. 3 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.
- this example mainly shows the functional blocks of the feature portion in the present embodiment, 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 transmitter / receiver 120 includes a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver 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 for example, 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 transform, and other transmission processing.
- IFFT inverse fast Fourier transform
- the transmission / reception unit 120 may perform modulation, filtering, amplification, etc. on the baseband signal to the radio frequency band, 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 / receives signals (backhaul signaling) to / from a device included in the core network 30, another base station 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 transmission unit and the reception 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 may transmit the PDCCH at least a part of the span determined based on the monitoring opportunity (PDCCH monitoring occasion).
- FIG. 4 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.
- this example mainly shows the functional blocks of the feature portion in the present embodiment, 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 transmitter / receiver 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitter / receiver 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 processing, 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 transmits the channel using the DFT-s-OFDM waveform.
- 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. on the baseband signal to the radio frequency band, 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 transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be composed of at least one of the transmitting / receiving unit 220 and the transmitting / receiving antenna 230.
- the control unit 210 determines (derives, specifies, etc.) a span pattern including a span for monitoring the downlink control channel (Physical Downlink Control Channel (PDCCH)) based on the monitoring opportunity (PDCCH monitoring occasion). You may.
- PDCH Physical Downlink Control Channel
- the transmission / reception unit 220 may monitor PDCCH candidates based on the span pattern.
- the control unit 210 may determine the span pattern of each component carrier based on a certain assumption regarding the span pattern of the plurality of component carriers.
- the control unit 210 may determine the span pattern of each component carrier based on the assumption that the span patterns of the plurality of component carriers are the same.
- the control unit 210 may determine the span pattern of each component carrier based on the assumption that the span patterns of the plurality of component carriers differ depending on the frequency range.
- each functional block may be realized by using one device that is physically or logically connected, or directly or indirectly (for example, by two or more devices that are physically or logically separated). , 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. 5 is a diagram showing an example of the hardware configuration of the base station and the user terminal according to the embodiment.
- the 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. ..
- 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, a register, 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, and is, for example, a flexible disc, a floppy (registered trademark) disc, an optical magnetic disc (for example, a compact disc (Compact Disc ROM (CD-ROM)), a digital versatile disc, etc.). 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 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)). May be configured to include.
- FDD Frequency Division Duplex
- TDD Time Division Duplex
- 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 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 in the time domain (Orthogonal Frequency Division Multiple Access (OFDMA) symbol, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.).
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Division Multiple Access
- the slot may be a time unit based on numerology.
- the slot may include a plurality of mini slots. Each minislot may consist of one or more symbols in the time domain.
- the mini-slot may also be referred to as a sub-slot.
- a minislot may consist of a smaller number of symbols than the slot.
- PDSCH (or PUSCH) transmitted in time units larger than the minislot may be referred to as 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 such as a channel-encoded data packet (transport block), a code block, or a code word, or may be a processing unit such as scheduling or link adaptation.
- 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.
- 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, a subslot, a slot, or the like.
- 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 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.
- Physical RB Physical RB (PRB)
- SCG sub-carrier Group
- REG resource element group
- 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, etc.) 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 with respect to 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.
- the information, parameters, etc. described in the present disclosure may be expressed using absolute values, relative values from predetermined values, or using other corresponding information. It may be represented. For example, 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.
- 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 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.
- 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, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.).
- wired technology coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.
- wireless technology infrared, microwave, etc.
- the terms “system” and “network” used in this disclosure may be used interchangeably.
- the “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 (for example, a car, an airplane, etc.), an unmanned moving body (for example, a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned type). ) May be.
- at least one of the base station and the mobile station 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.
- the communication between the base station and the user terminal is replaced with the 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”).
- an uplink channel, a downlink channel, and the like may be read as a 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
- 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)
- LTE 802.16 WiMAX (registered trademark)
- Ultra-WideBand (UWB), Bluetooth®, other systems utilizing appropriate wireless communication methods, next-generation systems extended based on these, and the like may be applied.
- 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 adopted 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) 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).
- 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 "maximum transmission power" described in the present disclosure may mean the maximum value of the transmission power, may mean the nominal UE maximum transmit power, or may mean the rated maximum transmission power (the). It may mean rated UE maximum transmit power).
- 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
NRでは、複数のニューメロロジーを適用して通信を制御することが求められている。例えば、NRでは、周波数帯域等に基づいて複数のサブキャリア間隔(SubCarrier Spacing(SCS))を適用して送受信することが想定されている。NRで利用されるSCSとしては、15kHz、30kHz、60kHz、120kHz、240kHzなどがある。もちろん、適用可能なSCSはこれらに限られない。
以上で示した従来のBD数/CCE数の上限は、スロットごとの値であった。しかしながら、超高信頼及び低遅延通信(Ultra Reliable and Low Latency Communications(URLLC))などのユースケースを考慮すると、スロット単位ではなくより短い単位でBD数/CCE数の上限が定義されることが好ましい。
<第1の実施形態>
第1の実施形態は、複数のCCがUEに設定されている場合のスパンパターンに関する。なお、本開示において、CCは、セル、キャリアなどと互いに読み替えられてもよい。
(1)複数のCCそれぞれの周波数レンジ(Frequency Range(FR))が異なる、
(2)複数のCCそれぞれの周波数バンドが異なる、
(3)複数のCCそれぞれの属するセルグループが異なる、
(4)複数のCCそれぞれのニューメロロジー(例えば、サブキャリア間隔)が異なる。
第2の実施形態は、重複しないCCEの最大数の上限Cに関する。
スパンベース非CA制限を有しないSCSについては、上述したRel.15のCA制限が適用されてもよい。
実施形態2-1-1では、Ncap cells<Σ3 μ=0(NDL,μ cells)である場合には、CA制限が適用されてもよい。この場合、あるSCS設定μあたりかつスロットあたりのCCE数の上限はmin(Cmax,slot,μ PDCCH,Ctotal,slot,μ PDCCH)であってもよい。
・Cmax,slot,μ PDCCH=Cmax,slot,μ PDCCH,spanの平均値×1スロット内のスパンの数、
・Cmax,slot,μ PDCCH=複数のCCにおけるCmax,slot,μ PDCCH,spanのうち特定の値(例えば、最小値、最大値)×1スロット内のスパンの数。
実施形態2-1-2では、Ncap cells<Σ3 μ=0(NDL,μ cells)である場合には、CA制限が適用されてもよい。この場合、あるSCS設定μあたりかつCCあたりかつスロットあたりのCCE数の上限はmin(Cmax,slot,μ,i PDCCH,Ctotal,slot,μ,i PDCCH)であってもよい。ここで、iはCCのインデックスである。当該Ctotal,slot,μ,i PDCCHは以下の式3で求められてもよい。
・Cmax,slot,μ PDCCH=全サービングセルのCmax,slot,μ,i PDCCH,spanの平均値×1スロット内のスパンの数、
・Cmax,slot,μ PDCCH=複数のCCにおけるCmax,slot,μ,i PDCCH,spanのうち特定の値(例えば、最小値、最大値)×1スロット内のスパンの数、
・Cmax,slot,μ PDCCH=特定のCC(例えば、設定されたなかで最小のCCインデックスのCC、最大のCCインデックスのCC)におけるCmax,slot,μ,i PDCCH,spanの値×1スロット内のスパンの数。
スパンベースCA制限は、スパンベース非CA制限を有するSCSに適用されてもよい。スパンベースCA制限は、SCSベースの制限(実施形態2-2-1)及びCCベースの制限(実施形態2-2-2)の少なくとも一方が適用されてもよい。なお、このSCSベースの制限は、異なるCCに同じCmax,slot,μ PDCCH,span、Ctotal,slot,μ PDCCH,spanなどが適用されることを意味してもよい。また、このCCベースの制限は、異なるCCに異なるCmax,slot,μ PDCCH,span、Ctotal,slot,μ PDCCH,spanなどが適用されることを意味してもよい。このCCベースの制限は、SCS及びCCベースの制限を意味してもよい。
実施形態2-2-1では、Ncap cells<Σ3 μ=0(NDL,μ cells)である場合には、CA制限が適用されてもよい。この場合、あるSCS設定μあたりかつスパンあたりのCCE数の上限はmin(Cmax,slot,μ PDCCH,span,Ctotal,slot,μ PDCCH,span)であってもよい。当該Ctotal,slot,μ PDCCH,spanは以下の式5で求められてもよい。
実施形態2-2-2では、Ncap cells<Σ3 μ=0(NDL,μ cells)である場合には、CA制限が適用されてもよい。この場合、あるSCS設定μあたりかつCCあたりかつスロットあたりのCCE数の上限はmin(Cmax,slot,μ,i PDCCH,span,Ctotal,slot,μ,i PDCCH,span)であってもよい。ここで、iはCCのインデックスである。当該Ctotal,slot,μ,i PDCCH,spanは以下の式8で求められてもよい。
・Cmax,slot,μ PDCCH,span=全サービングセルのCmax,slot,μ,i PDCCH,spanの平均値(上述の式4で求められてもよい)、
・Cmax,slot,μ PDCCH,span=複数のCCにおけるCmax,slot,μ,i PDCCH,spanのうち特定の値(例えば、最小値、最大値)、
・Cmax,slot,μ PDCCH,span=特定のCC(例えば、設定されたなかで最小のCCインデックスのCC、最大のCCインデックスのCC)におけるCmax,slot,μ,i PDCCH,spanの値。
・全サービングセルのCmax,slot,μ,i PDCCH,spanのうち、最も小さい(又は最も大きい)方からNcap cells個のCCインデックス、
・設定されたCCインデックスのうち、最も小さい(又は最も大きい)方からNcap cells個のCCインデックス。
上述の各実施形態は、CCE数の上限について説明したが、これに限られない。例えば、CCE数の上限をBD数の上限を読み替え、CCE数の上限に関する任意のパラメータC*(例えば、Ctotal,slot,μ PDCCH、Cmax,slot,μ,i PDCCH,spanなど)を、BD数の上限に関する対応するパラメータM*(例えば、Mtotal,slot,μ PDCCH、Mmax,slot,μ,i PDCCH,spanなど)で読み替えることで、本開示はMに関するCA制限もカバーする。
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3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4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 (4)
- モニタリング機会に基づいて、下りリンク制御チャネル(Physical Downlink Control Channel(PDCCH))をモニタするためのスパンを含むスパンパターンを決定する制御部と、
前記スパンパターンに基づいてPDCCH候補をモニタする受信部と、を有し、
前記制御部は、複数のコンポーネントキャリアのスパンパターンに関するある想定に基づいて、各コンポーネントキャリアのスパンパターンを決定することを特徴とする端末。 - 前記制御部は、前記複数のコンポーネントキャリアのスパンパターンが同じであるという想定に基づいて、各コンポーネントキャリアのスパンパターンを決定することを特徴とする請求項1に記載の端末。
- 前記制御部は、前記複数のコンポーネントキャリアのスパンパターンが周波数レンジに応じて異なるという想定に基づいて、各コンポーネントキャリアのスパンパターンを決定することを特徴とする請求項1に記載の端末。
- モニタリング機会に基づいて、下りリンク制御チャネル(Physical Downlink Control Channel(PDCCH))をモニタするためのスパンを含むスパンパターンを決定するステップと、
前記スパンパターンに基づいてPDCCH候補をモニタするステップと、を有し、
前記決定するステップは、複数のコンポーネントキャリアのスパンパターンに関するある想定に基づいて、各コンポーネントキャリアのスパンパターンを決定することを特徴とする端末の無線通信方法。
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