User terminal and wireless communication method

Abstract

One embodiment of the user terminal of the present invention comprises: a receiving unit configured to receive downlink control information including a specific field value indicating a second bandwidth part (BWP) within a carrier from at least one of a plurality of transmission / reception points (TRPs) transmitting a downlink shared channel within a first bandwidth part (BWP) within the carrier; and a control unit configured to control switching from the first BWP to the second BWP with respect to the plurality of TRPs. This allows for appropriate BWP switching when using multiple TRPs.

Description

Technical Field

[0001] The present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system. Background Art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been standardized to achieve even higher data rates and lower latency (Non-Patent Document 1). Furthermore, LTE-Advanced (3GPP Rel. 10-14) has been standardized to further enhance the capacity and sophistication of LTE (Third Generation Partnership Project (3GPP) Releases (Rel.) 8 and 9).

[0003] Successor systems to LTE (for example, also referred to as fifth-generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel. 15 and later, etc.) are also under study.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention

[0007] Problems to be solved by the invention

[0008] In future wireless communication systems (hereinafter also referred to as NR), research is underway to configure one or more partial bands within a carrier (also known as a component carrier (CC), cell, or serving cell) configured for a user terminal (user equipment (UE)). These partial bands are also referred to as bandwidth parts (BWPs).

[0009] In addition, the UE is also studying how to control the activation (activation) or deactivation (deactivation) of the BWP. The operation of switching the activated BWP (active BWP) is also called BWP switching.

[0010] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) are being studied for downlink (downlink (DL)) or uplink (uplink (UL)) communications with user terminals (User Equipment (UE)). However, when using multiple TRPs, the above-mentioned BWP switching may not be properly implemented.

[0011] Therefore, an object of the present disclosure is to provide a user terminal and a wireless communication method that can appropriately implement BWP switching when using multiple TRPs.

[0012] Means for solving problems

[0013] One embodiment of a user terminal of the present invention is characterized in that it comprises: a receiving unit for receiving downlink control information from at least one of a plurality of transmit / receive points (TRPs) for transmitting a downlink shared channel in a first bandwidth part (BWP) within a carrier, the downlink control information including a specific field value for indicating a second bandwidth part (BWP) within the carrier; and a control unit for controlling switching from the first BWP to the second BWP with respect to the plurality of TRPs.

[0014] Effects of the Invention

[0015] According to the present invention, BWP switching can be appropriately implemented when using multiple TRPs. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1A as well as Figure 1B This is a diagram showing an example of BWP switching.

[0017] Figures 2A to 2C This is a diagram showing an example of a multi-TRP scenario.

[0018] Figure 3 This is a diagram showing an example of BWP switching in the first mode of the first embodiment.

[0019] Figure 4A as well as Figure 4B This is a diagram showing another example of BWP switching in the first mode of the first embodiment.

[0020] Figure 5A as well as Figure 5B This is a diagram showing an example of DCI used in BWP switching in the first mode of the first embodiment.

[0021] Figure 6 This is a diagram showing another example of BWP switching in the first mode of the first embodiment.

[0022] Figure 7 This is a diagram showing an example of BWP switching in the first mode of the second embodiment.

[0023] Figure 8 This is a diagram showing an example of BWP switching in the second mode of the second embodiment.

[0024] Figure 9 This is a diagram showing an example of a schematic configuration of a wireless communication system according to one embodiment.

[0025] Figure 10 This is a diagram showing an example of the configuration of a base station according to one embodiment.

[0026] Figure 11 This is a diagram showing an example of the configuration of a user terminal according to one embodiment.

[0027] Figure 12 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to one embodiment. DETAILED DESCRIPTION

[0028] (BWP switch)

[0029] In NR, research is underway to configure one or more partial bands (Bandwidth Parts (BWPs)) within a carrier. A carrier can be referred to as a cell, serving cell, or component carrier (CC).

[0030] The BWP may include a BWP for downlink (DL) and a BWP for uplink (UL) (UL downlink control channel (Physical Downlink Control Channel (PDCCH))). At least one of one or more DL BWPs and one or more UL BWPs may be configured for one carrier.

[0031] When multiple BWPs (e.g., at least two of one or more DL BWPs and one or more UL BWPs) are configured within one carrier, activation or deactivation of a portion of the multiple BWPs (e.g., at least one of one DL BWP and one UL BWP) can also be controlled.

[0032] For example, within one carrier, one DL BWP or one UL BWP may be activated. The activated DL BWP (activate DL BWP) or the activated UL BWP (activate UL BWP) may also be switched.

[0033] The action of switching between activating the DL BWP and activating the UL BWP may also be referred to as BWP switching, BWP switching, BWP change, etc.

[0034] BWP switching can also be performed based on the value of a specific field (such as the Bandwidth Part indicator (BI) field) in the downlink control information (Downlink Control Information (DCI)) (also known as DCI-based BWP switching, the first mechanism, etc.), or BWP switching can also be performed based on a specific timer (BWP-Inactivity timer (BWP-Inactivity Timer)) (also known as timer-based BWP switching, the second mechanism, etc.).

[0035] The DCI may also be the DCI (e.g., DCI format 1_1) used in the DCI scheduling of a downlink shared channel (e.g., the physical downlink shared channel (PDSCH))), or the DCI (e.g., DCI format 0_1) used in the scheduling of an uplink shared channel (e.g., the physical uplink shared channel (PUSCH)).

[0036] Hereinafter, when no distinction is made between DL BWP and UL BWP, the term "BWP" will be used collectively, but BWP can also be interpreted as either DL BWP or UL BWP. Similarly, when no distinction is made between activated DL BWP and activated UL BWP, the term "activated BWP" will be used collectively, but activated BWP can also be interpreted as either activated DL BWP or activated UL BWP.

[0037] Figure 1A as well as Figure 1B This is a diagram showing an example of BWP switching. Figure 1A 1B shows an example of switching the active BWP in the carrier from BWP#1 to BWP#2.

[0038] In addition, Figure 1A as well as Figure 1B In the example, BWP#1 and #2 are configured in non-overlapping bands within the carrier, but at least a portion of BWP#1 and #2 may be configured in overlapping bands. Figure 1A as well as Figure 1B , the time unit is an example of a time slot, but the present invention is not limited thereto. In addition, two or more BWPs may be set for a UE.

[0039] exist Figure 1A An example of DCI-based BWP switching is shown in FIG. In DCI-based BWP switching, the UE monitors a specific search space set and detects DCI transmitted via a downlink control channel (e.g., the Physical Downlink Control Channel (PDCCH)). The DCI may also include information indicating the BWP to be activated (also known as a BWP identifier, a bandwidth part indicator (BI), a BI field value, a specific field value, etc.). The UE may also control the switching of the activated BWP based on the BI within the DCI.

[0040] For example, in Figure 1AIn time slot #0, the UE detects DCI (e.g., DCI format 1_1 or 0_1) containing the BI indicating BWP #1 (the currently active BWP) in time slot #0. The UE can also control the reception of the PDSCH or the transmission of the PUSCH in BWP #1 based on the DCI in time slot #0.

[0041] Meanwhile, the UE detects DCI (e.g., DCI format 1_1 or 0_1) containing a BI indicating BWP#2 (the currently deactivated BWP) in time slot #n. Based on this DCI, the UE changes the active BWP from BWP#1 to BWP#2. Furthermore, the UE can control PDSCH reception or PUSCH transmission in BWP#2 in time slot #n+Y based on this DCI.

[0042] Here, Y is the delay time required for BWP switching. This delay time can also be expressed as a specific number of time units (e.g., a specific number of time slots). The UE may not detect DCI requesting BWP switching at a time slot offset smaller than Y from time slot #n+Y during PDSCH reception or PUSCH transmission (i.e., it may not detect this DCI after time slot #n+1).

[0043] exist Figure 1B In the case where the size of a specific field is different between the DCI containing the BI representing BWP#1 and the DCI containing the BI representing BWP#2, zero may be prepended to the specific field, the least significant bit (LSB) may be used, or the most significant bit (MSB) may be used.

[0044] Figure 1B An example of timer-based BWP switching is shown in Figure 2. In a timer-based BWP, a specific timer (e.g., BWP-Inactivity Timer) is used to control the switching of the active BWP to a specific BWP (also known as the default BWP). The default BWP can be configured for the UE via higher-layer parameters (e.g., defaultDownlinkBWP-Id or initialDownlinkBWP) or determined by the UE based on specific rules.

[0045] The above timer may also represent the duration until the UE falls back (switches) the activated BWP to the default BWP. The timer (or duration) may also be set to the UE via a higher-layer parameter (e.g., "BWP-Inactivity Timer" in the control element (Information Element (IE)) of the Radio Resource Control (RRC)). The duration may also be expressed in milliseconds. In addition, the RRC IE may also be referred to as an RRC parameter.

[0046] like Figure 1B As shown, when the UE detects the DCI scrambled by the Cyclic Redundancy Check (CRC) through a specific Radio Network Temporary Identifier (RNTI), the timer may also be started or restarted.

[0047] The specific RNTI may be, for example, a cell-RNTI (Cell(C)-RNTI) or a configured scheduling-RNTI (Configured Scheduling(CS)-RNTI). Furthermore, CRC scrambling using the specific RNTI may mean including (or appending) CRC bits scrambled (masked) using the specific RNTI in the DCI.

[0048] When starting (or restarting) the timer, the UE may decrement or reverse the timer at the end of a specific time unit (e.g., a subframe in frequency range (FR) 1 and a half-subframe in FR2). The timer may also expire when the timer (or its value) reaches 0. If the UE detects DCI before the timer expires, it restarts the timer.

[0049] The UE may also switch the BWP to the default BWP when the timer expires. Specifically, the UE may also deactivate the activated BWP and activate the default BWP.

[0050] For example, Figure 1B In the example, the UE detects the DCI scrambled by CRC using a specific RNTI in time slot #0, and thus starts the above timer. The UE can also control the reception of PDSCH or the transmission of PUSCH in BWP #1 based on this DCI.

[0051] If the UE detects the DCI in slot #1 before the timer expires, the timer is restarted. If the UE does not detect the DCI between slot #1 and the timer expires, the BWP switching may be initiated in slot #n. Here, n may be the beginning of the subframe (FR1) or half-subframe (FR2) after the timer expires.

[0052] like Figure 1B As shown, the switch of the active BWP from BWP#1 to BWP#2 (default BWP) can also occur no later than slot#n+Y. The UE can receive the PDSCH or transmit the PUSCH in BWP#2 after slot#n+Y. The UE is not requested to transmit UL signals or receive DL signals during period Y.

[0053] (Multiple TRP)

[0054] In NR, one or more transmission / reception points (Transmission / Reception Point (TRP)) (multi-TRP) using one or more panels (multi-panel) to perform DL transmission (e.g., PDSCH transmission) to the UE is being studied.

[0055] Figures 2A to 2C This is an example of a multi-TRP scenario. Figures 2A to 2C In the example, it is assumed that each TRP can send 4 different beams, but it is not limited to this. Figures 2A to 2C In the example, it is assumed that each TRP has one panel, but a TRP may also have multiple panels, and the reception of PDSCH from each of the multiple panels is controlled by PDCCH from a single panel or multiple panels.

[0056] Figure 2A This is an example of a situation where only one TRP (TRP1 in this example) among multiple TRPs sends PDCCH to the UE, and the multiple TRPs send PDSCH. Figure 2A In the example, the UE receives PDSCH1 and PDSCH2 transmitted from TRP1 and TRP2, respectively, based on one PDCCH (DCI) from TRP1.

[0057] like Figure 2AAs shown, the scheduling of PDSCHs from multiple TRPs using the PDCCH (DCI) from a single TRP is also referred to as single DCI, single PDCCH, single host mode, PDCCH type A (first PDCCH type), or DMRS port group type A (first DMRS port group type), etc. Although not shown, the transmission of multiple PUSCHs from multiple TRPs scheduled using DCI from a single TRP can also be referred to similarly.

[0058] Figure 2B And 2C represents an example of a situation where multiple TRPs send different PDCCHs to the UE, and the multiple TRPs send PDSCHs respectively. Figure 2B In 2C, the UE receives PDSCHs 1 and 2 transmitted from TRPs 1 and 2, respectively, based on PDCCHs (DCI) 1 and 2 transmitted from TRPs 1 and 2, respectively.

[0059] like Figure 2B As shown in FIG2C , the scheduling of PDSCHs from multiple TRPs using PDCCHs (DCIs) from multiple TRPs is also referred to as multiple DCIs, multiple PDCCHs, or a multi-host mode. Although not shown, the transmission of multiple PUSCHs from multiple TRPs scheduled using DCIs from multiple TRPs may also be referred to similarly.

[0060] In multiple PDCCHs, such as Figure 2B As shown, the multiple TRPs (eg, TRP1 and 2) may be connected via an ideal backhaul or a non-ideal backhaul with low latency. Figure 2B The scenario shown is also referred to as PDCCH type B (second PDCCH type) or DMRS port group type B (second DMRS port group type), etc.

[0061] Or in multiple PDCCHs, such as Figure 2C As shown, the multiple TRPs (eg, TRP1 and 2) may also be connected via a non-ideal backhaul with large latency. Figure 2B The scenario shown is also referred to as PDCCH type C (third PDCCH type) or DMRS port group type C (second DMRS port group type), etc.

[0062] In a multi-TRP scenario such as the one described above, the transmission of non-coherent DL signals (e.g., PDSCH) from each of the multiple TRPs or the transmission of UL signals (e.g., PUSCH) to the multiple TRPs is studied. Coordinating the transmission of non-coherent DL signals or UL signals is also called NCJT (Non-Coherent Joint Transmission).

[0063] For example, in NCJT, between the multiple TRPs and the UE, the same codeword (CW) can be sent using different layers, or different CWs can be sent. In addition, CW can be called a transport block (Transport Block (TB) etc.).

[0064] Multiple PDSCHs or multiple PUSCHs that are NCJTed may also be considered not to be quasi-co-located. Furthermore, multiple PDSCHs or multiple PUSCHs that are NCJTed may be defined as partially or completely overlapping with respect to at least one of the time domain and the frequency domain.

[0065] In the above multi-TRP scenario, how to control BWP switching becomes a problem. Specifically, in the case of multiple PDCCHs (e.g. Figure 2B Or 2C), how to control the BWP switching based on the above-mentioned DCI or the BWP switching based on the timer becomes a problem.

[0066] Therefore, the inventors of the present invention studied a method for appropriately implementing at least one of DCI-based BWP switching (first method) and timer-based BWP switching (second method) in multiple PDCCHs, and thus completed the present invention.

[0067] Hereinafter, the embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. In addition, each mode of the present embodiment can be applied independently or in combination.

[0068] In addition, in this embodiment, TRP, panel, uplink (Uplink (UL)) transmitting entity, antenna port (DMRS port) of demodulation reference signal (DeModulation Reference Signal (DMRS)), group of DMRS ports (DMRS port group), group of DMRS ports (CDM group) of code division multiplexing (Code Division Multiplexing (CDM)), antenna port group, group related to reference signal (Reference Signal (RS)) (RS related group (RS related group)), control resource set (Control Resource Set (CORESET), search space set, PDSCH, codeword, base station, etc. can also be replaced with each other.

[0069] In addition, the ideal backhaul or the non-ideal backhaul may also be identified or interpreted by a specific type (eg, type A or type B) of a DMRS port group, an RS association group, or an antenna port group.

[0070] In addition, the terms panel identifier (ID) and panel are interchangeable. TRP ID and TRP are interchangeable. Cell ID and cell (serving cell) are interchangeable. ID, index, and number are interchangeable. Cell can also be interpreted as serving cell, carrier, CC, etc. Expect and assume are interchangeable.

[0071] In addition, the following description uses multiple PDCCHs (for example, see Figure 2B For example, based on the control of BWP switching of a specific TRP (e.g., one TRP) among multiple TRPs, when using a single PDCCH (e.g., referring to Figure 2A ) can also be appropriately applied.

[0072] In addition, in the following, multiple TRPs can also be connected through an ideal backhaul, or can also be connected through a non-ideal backhaul.

[0073] (First Method)

[0074] In the first embodiment, DCI-based BWP switching in multiple PDCCHs is described. DCI-based BWP switching can also be configured for the UE using higher-layer parameters (e.g., RRC parameters). DCI-based BWP switching can also support one or more operation modes (e.g., at least one of the first to third modes described below).

[0075] <First Mode>

[0076] In the first mode, multiple DCIs each containing a BI may be sent from multiple TRPs, where the BI represents a BWP different from the currently activated BWP. The UE may also be expected to receive multiple DCIs containing the BI from the multiple TRPs.

[0077] In the first mode, the UE may not expect to receive multiple DCIs each containing a BI representing a different BWP from multiple TRPs (simultaneously) in the same time unit (e.g., time slot or symbol). That is, the UE may also expect to receive multiple BWPs each containing a BI representing the same BWP from multiple TRPs in the same time unit.

[0078] Figure 3 This is a diagram showing an example of BWP switching in the first mode of the first embodiment. Figure 3 Multiple PDCCHs are shown in Figure 2B or Figure 2C ) is an example of DCI-based BWP switching. Figure 3 In the example, the active BWP is changed from BWP#1 to BWP#2.

[0079] For example, in Figure 3 In the example, the UE receives multiple DCIs from TRP#1 and TRP#2 in the same time slot #n, each of which includes BIs indicating the same BWP#2. In this way, the UE does not need to expect that the multiple DCIs received from TRP#1 and TRP#2 in the same time slot include BIs indicating different BWPs.

[0080] exist Figure 3 In time slot #n of TRP#1, the UE can also control the switching of the active BWP based on which of the BI in the DCI is sent from TRP#1 and TRP#2. Specifically, the UE can also switch the active BWP to BWP#2 before time slot #n+Y. In addition, during period Y, Figure 1A As described in .

[0081] exist Figure 3 In time slot #n+Y of BWP#2, the UE can also control the reception of PDSCH or transmission of PUSCH of TRP#1 in BWP#2 based on the DCI from TRP#1 detected in time slot #n. In addition, the UE can also control the reception of PDSCH or transmission of PUSCH of TRP#2 in BWP#2 based on the DCI from TRP#2 detected in time slot #n.

[0082] In addition, the UE may also expect the same time slot (e.g. Figure 3Receive DCI containing BI and DCI not containing BI from TRP#1 and #2 in time slot #0).

[0083] In addition, in the first mode, when the UE receives multiple DCIs containing BIs representing different BWPs from multiple TRPs in the same time unit (for example, time slot or code element), the UE may also switch to activate the BWP based on the BI in the DCI from one of the multiple TRPs.

[0084] The UE may also determine the one TRP from the multiple TRPs according to a specific rule. For example, the specific rule may be the TRP with the lowest or highest index among the multiple TRPs. Alternatively, the one TRP may also be specified to the UE by a higher-layer parameter (e.g., RRC IE or Medium Access Control (MAC) Control Element (CE)).

[0085] In addition, the UE may also ignore the BI in the DCI from other TRPs among the multiple TRPs, or may assume that the BI does not exist in the DCI.

[0086] Figure 4A as well as Figure 4B 1 is a diagram showing another example of BWP switching in the first mode of the first embodiment. Figure 4A as well as Figure 4B In, with Figure 3 The following explanation will focus on the differences between Figure 4A as well as Figure 4B In the same time slot #n, the UE receives multiple DCIs containing BI from TRP #1 and #2, respectively. The BIs represent different BWP #2 and #3 instead of the same BWP. Figure 3 different.

[0087] For example, in Figure 4A In time slot #n, the UE selects TRP#1 with the lowest index between TRP#1 and TRP#2. The UE may also switch the active BWP from BWP#1 to BWP#2 for both TRP#1 and TRP#2 before time slot #n+Y based on the BI (here, BWP#2) in the DCI from the selected TRP#1.

[0088] On the other hand, Figure 4BIn time slot #n, the UE selects TRP#2 with the highest index between TRP#1 and TRP#2. The UE may also switch the active BWP from BWP#1 to BWP#3 for both TRP#1 and TRP#2 before time slot #n+Y based on the BI (here, BWP#3) in the DCI from the selected TRP#2.

[0089] exist Figure 4A and time slot #n of 4B, the UE may also ignore the time slots from the unselected TRP (in Figure 5A TRP#2 in Figure 5B The BI in the DCI of TRP#1).

[0090] Figure 5A as well as Figure 5B : is a diagram showing an example of DCI used in BWP switching in the first mode of the first embodiment. Figure 5A And in 5B, for example Figure 4A As described in FIG. 4B , two DCIs are illustrated that are received from different TRPs #1 and #2 in time slot #n.

[0091] like Figure 5A As shown, the UE may also assume that there is a BI field in each of the two DCIs transmitted from TRP #1 and #2. In this case, the two DCIs may also have the same bit size (payload).

[0092] For example, Figure 5A In the example, the UE can also control the switching of the activated BWPs of both TRP#1 and #2 based on the BI in the DCI from TRP#1 selected according to a specific rule (here, with the lowest index). On the other hand, the UE can also ignore the BI in the DCI from TRP#2.

[0093] In addition, Figure 5A In the embodiment of the present invention, the BI in the DCI from TRP#2 can also be used for other purposes. Such other purposes can also be at least one of, for example, time domain resource allocation (Time domain Resource Assignment), frequency domain resource allocation (Frequency domain Resource Assignment), downlink assignment index (Downlink Assignment Index (DAI)), etc.

[0094] On the other hand, Figure 5BAs shown, the UE may also assume that the BI field exists in the DCI of TRP#1 selected according to a specific rule in TRP#1 and TRP#2, and the BI field does not exist in the DCI from other TRP#2. In this case, the two DCIs may have different bit sizes. For example, Figure 5B In the example, the DCI from TRP#1 is x bits, and the DCI from TRP#2 can be x-p bits. Here, p is the number of bits in the BI field.

[0095] exist Figure 5A As in 5B, the two DCIs from TRP #1 and #2, respectively, may also be associated with different CORESETs (or may be detected by monitoring multiple search space sets associated with different CORESETs). In this case, the UE can identify the TRP that sent the DCI through the CORESET associated with the DCI (associated with the search space set in which the DCI was detected).

[0096] Or, in Figure 5A In the case of a two-way DCI, the two DCIs may be associated with the same CORESET (or may be detected by monitoring one or more search space sets associated with the same CORESET). In this case, the UE can identify the TRP that sent the DCI by using the specific field value in each DCI. Alternatively, the UE may also identify the TRP that sent the DCI based on the search space set or setting information of the detected DCI (for example, "PDCCH-Config" of the RRC IE).

[0097] <Second Mode>

[0098] In the second mode, a DCI containing a BI indicating a BWP different from the currently activated BWP may be sent from a specific TRP (e.g., one TRP) among the multiple TRPs. The UE may also expect to receive a DCI containing the BI from a specific TRP among the multiple TRPs. The UE may also not expect to receive a DCI containing the BI from other TRPs among the multiple TRPs.

[0099] The specific TRP may also be configured to the UE via a higher-layer parameter (e.g., RRC IE), or may be determined by the UE according to a specific rule (e.g., having the lowest or highest index). Alternatively, the UE may determine the specific TRP according to a specific rule from among multiple TRP candidates configured to the UE via a higher-layer parameter.

[0100] A DCI sent from a specific TRP set or determined as above may also include BI. Alternatively, even if multiple DCIs sent from multiple TRPs respectively include BI, the UE may control BWP switching based on the BI within the DCI from the above-mentioned specific TRP among the multiple TRPs.

[0101] When this specific TRP sends a DCI containing a BI indicating a BWP different from the currently active BWP (deciding to perform BWP switching), it can also notify other TRPs to perform BWP switching.

[0102] This notification may be made via an ideal backhaul or a non-ideal backhaul, or via X2 signaling or Xn signaling. This ensures consistency of activated BWPs between TRPs.

[0103] In addition, in the above description, it is assumed that BWP switching is determined by one TRP determined from multiple TRPs, but the present invention is not limited to this. The multiple TRPs may also determine BWP switching separately. In this case, the respective determination results may be coordinated via a specific interface (e.g., x2 or xn) between the multiple TRPs, and DCI including a BI indicating the determined BWP may be transmitted from at least one of the multiple TRPs.

[0104] Figure 6 1 is a diagram showing another example of BWP switching in the first mode of the first embodiment. Figure 6 China and Israel Figure 3 The following description focuses on the differences.

[0105] For example, in Figure 6 In the example, the UE receives a DCI containing a BI from a specific TRP (here, TRP#1) in time slot #n, where the BI indicates BWP#2, which is different from the currently active BWP, BWP#1. On the other hand, the UE can also receive a DCI without a BI from the other TRP (here, TRP#2).

[0106] like Figure 6 As shown, the UE can also control the change of the active BWP based on the BI in the DCI sent from TRP#1. Specifically, the UE can also switch the active BWP from BWP#1 to BWP#2 before time slot #n+Y for both TRP#1 and #2 based on the BI.

[0107] exist Figure 6In time slot #n+Y of BWP#2, the UE can also control the reception of PDSCH or transmission of PUSCH of TRP#1 in BWP#2 based on the DCI from TRP#1 detected in time slot #n. In addition, the UE can also control the reception of PDSCH or transmission of PUSCH of TRP#2 in BWP#2 based on the DCI from TRP#2 detected in time slot #n.

[0108] In addition, Figure 6 The two DCIs sent from TRP#1 and TRP#2 in time slot #n can also be of different DCI formats or different sizes (payloads). For example, the DCI containing the BI sent from TRP#1 can be DCI format 1_1 or 0_1, and the DCI not containing the BI sent from TRP#2 can be DCI format 1_0 or 0_0.

[0109] <Third Mode>

[0110] In the third mode, DCI-based BWP switching in multiple PDCCHs may not be supported. Alternatively, when multiple PDCCHs are configured for a UE, DCI-based BWP switching may not be configured for the UE.

[0111] In the third mode, a BWP may not be configured in each serving cell (carrier) configured for the UE. Alternatively, the UE may not even configure reception or transmission in any BWP based on higher layer parameters (e.g., "BWP-Downlink" or "BWP-Uplink" in the RRC IE) in the serving cell.

[0112] When a set of a specific number of BWPs (e.g., a maximum of 4 DL BWPs or a maximum of 4 UL BWPs) is set based on higher-layer parameters (e.g., "BWP-Downlink" or "BWP-Uplink" of RRC IE), the UE may ignore the BI even if it exists in the DCI (e.g., DCI format 1_1 or 0_1).

[0113] In the third mode, the UE may also decide to activate the BWP semi-statically. For example, the activated BWP may be configured for the UE based on system information (e.g., SIB1), higher-layer parameters common within the cell (e.g., "initialDownlinkBWP" in the "DownlinkConfigCommon" field of the RRC IE), or higher-layer parameters specific to the UE (e.g., "BWP-Downlink" in the "ServingCellConfig" field of the RRC IE).

[0114] Alternatively, the BWP may be activated according to the RRC configuration or RRC reconfiguration. The UE may also semi-statically configure the BWP to be activated using RRC parameters.

[0115] In addition, when multiple BWPs are configured for the UE, one of the multiple BWPs can be configured as the active BWP for the UE through RRC parameters or MAC CE. Alternatively, the UE can determine the active BWP from the multiple BWPs according to a specific rule (e.g., the lowest or largest BWP index).

[0116] <Support / Action Mode Control>

[0117] Whether DCI-based BWP switching is supported can also be explicitly or implicitly indicated to the UE. In the case of explicit indication, the UE can also receive information indicating whether DCI-based BWP switching is supported (BWP switching information) and decide whether to support DCI-based BWP switching based on this information.

[0118] For example, when the BWP switching information indicates support for DCI-based BWP switching (e.g., enabled (on)), the UE may also determine to support DCI-based BWP switching. On the other hand, when the BWP switching information indicates support for DCI-based BWP switching (e.g., disabled (off)), the UE may determine not to support DCI-based BWP switching even if multiple BWPs are configured within the serving cell.

[0119] On the other hand, in the case of implicit indication, the UE may also decide whether to support DCI-based BWP switching based on at least one of the number of BWPs set in the serving cell, the type of connection between multiple TRPs (e.g., ideal backhaul or non-ideal backhaul), the type of delay, the type of PDCCH (e.g., also called single PDCCH or multiple PDCCHs, scheduling type, etc.), and the type of DMRS port group.

[0120] For example, if multiple BWPs are configured in the serving cell, the UE may decide to support DCI-based BWP switching. On the other hand, if multiple BWPs are not configured in the serving cell (if only one BWP is configured in the serving cell, or if there is a single activated BWP in the serving cell that is the same as or different from the initial BWP), the UE may also decide not to support DCI-based BWP switching.

[0121] In DCI-based BWP switching, one of the first to third modes may be supported. For example, when the UE decides to support DCI-based BWP switching, it may operate in either the first or second mode.

[0122] Alternatively, at least two of the first to third modes may be supported, and the DCI-based BWP switching operation mode may be determined by higher layer parameters. The operation mode may also be explicitly or implicitly indicated to the UE.

[0123] In the case of explicit indication, the UE may receive information indicating the operation mode of BWP switching based on DCI (operation mode information) and operate in the operation mode indicated by the information.

[0124] On the other hand, in the case of implicit indication, the UE may also determine the action mode based on at least one of the number of BWPs set in the serving cell, the type of connection between multiple TRPs (e.g., ideal backhaul or non-ideal backhaul), the type of delay, the type of PDCCH (e.g., also called single PDCCH or multiple PDCCHs, scheduling type, etc.), and the type of DMRS port group.

[0125] As described above, in the first embodiment, it is possible to appropriately control BWP switching based on DCI in multiple PDCCHs.

[0126] (Second Method)

[0127] In the second embodiment, timer-based BWP switching in multiple PDCCHs is described. Timer-based BWP switching can also be configured for the UE using higher-layer parameters (e.g., RRC parameters). Timer-based BWP switching can also support one or more operation modes (e.g., at least one of the first to third modes described below).

[0128] <First Mode>

[0129] In the first mode, the switching of the active BWP is controlled based on the timers of the respective multiple TRPs.

[0130] TRP Common Timer Value

[0131] The UE may also set the timer value for each cell through a higher layer parameter (e.g., "bwp-InactivityTimer" in RRC IE). The timer value may also be common among TRPs within a cell.

[0132] The UE may also control the switching of the active BWP according to a timer value common to all TRPs. Specifically, the UE may control the start or restart of a timer with a value common to all TRPs within a cell. Furthermore, the UE may switch the active BWP to the default BWP when the timer of one of the multiple TRPs expires.

[0133] The UE may also start or restart the above timer when specific conditions are met in each TRP. The timer may also be associated with the activated BWP. The specific conditions for starting or restarting the timer in each TRP may also be, for example, any of the following.

[0134] Activate BWP to detect DCI (PDCCH) scrambled with CRC using a specific RNTI (e.g. C-RNTI or CS-RNTI)

[0135] Sending or receiving MAC Protocol Data Units (MAC PDUs) (i.e., sending or receiving data without a dynamic grant) via a configured grant (configured UL grant) or a configured DL assignment (semi-persistent scheduling (SPS))

[0136] 《Timer value for each TRP》

[0137] Alternatively, the UE may set the timer value for each TRP through the higher layer parameter. The timer value may also be independent (dedicated, specific) for each TRP within the cell.

[0138] The UE may also control the switching of the active BWP according to the timer value set for a specific TRP (e.g., the TRP with the lowest or highest index). Specifically, the UE may also control the start or restart of the timer for each TRP within the cell. In addition, the conditions for starting or restarting the timer in each TRP may be the same as when using a timer value common to all TRPs. The UE may also switch the active BWP to the default BWP when the timer of any of the multiple TRPs expires.

[0139] Figure 7 : is a diagram showing an example of BWP switching in the first mode of the second embodiment. Figure 7In FIG, multiple PDCCHs are shown (refer to Figure 2B or Figure 2C ) is an example of a timer-based BWP switching. For example, Figure 7 In the example, the active BWP is changed from BWP#1 to BWP#2.

[0140] exist Figure 7 In the example, the timer value can be set on a cell basis (TRP common) or on a TRP basis (for each TRP). Figure 7 The DCI detected in is assumed to be CRC-scrambled with a specific RNTI (eg, C-RNTI or CS-RNTI).

[0141] For example, in Figure 7 In the example, the UE detects DCI (PDCCH) transmitted from TRP#1 in time slot #0 and therefore starts the above timer for TRP#1. Furthermore, the UE detects DCI (PDCCH) transmitted from TRP#2 in time slot #1 and therefore starts the above timer for TRP#2. Furthermore, the UE detects DCI (PDCCH) transmitted from both TRP#1 and #2 in time slot #2 and therefore restarts the above timer for each of TRP#1 and #2.

[0142] In addition, the UE can identify the TRP that sent the DCI through the CORESET associated with the DCI (the CORESET associated with the search space set in which the DCI was detected), or identify the TRP through a specific field value within the DCI. Alternatively, the UE can also identify the TRP that sent the DCI based on the search space set or setting information (such as "PDCCH-Config" of the RRC IE) in which the DCI was detected.

[0143] exist Figure 7 In time slot #2, the timer restarted by TRP #1 and #2 expires in time slot #n-1. Therefore, the UE can also start switching from BWP #1 of the activated BWP to BWP #2 in time slot #n. The UE can also receive PDSCH or send PUSCH after BWP #2 in time slot n+Y. The UE can also Figure 1B As described in , during period Y, no UL signal transmission or DL ​​signal reception is requested.

[0144] exist Figure 7 In the example, the timers of TRP#1 and #2 expire in the same time unit (here, time slot #n-1), but the switching of the activated BWP can also be performed when either the timer of TRP#1 or #2 expires.

[0145] <Second Mode>

[0146] In the second mode, switching of the activated BWP is controlled based on a specific TRP (eg, one TRP) among a plurality of TRPs.

[0147] The UE may also expect to switch the activated BWP when a timer started by a specific TRP among the multiple TRPs expires. The UE may also not expect the activated BWP to be switched even if a timer started in another TRP among the multiple TRPs expires.

[0148] In the second mode, the timer value can be set on a cell basis (TRP common) or on a TRP basis.

[0149] The specific TRP may also be configured to the UE via higher-layer parameters (e.g., RRC control elements), or may be determined by the UE according to specific rules (e.g., having the lowest or highest index). Alternatively, the UE may determine a TRP according to specific rules from multiple TRP candidates configured to the UE via higher-layer parameters.

[0150] BWP switching can also be controlled based on a timer started by a specific TRP set or determined as described above. In addition, in other TRPs, the timer can be started when the specific conditions are met, but BWP switching can also be not performed even if the timer expires.

[0151] The specific TRP can also notify other TRPs to switch BWPs when the timer expires (deciding to switch BWPs). This notification can also be made via an ideal backhaul or a non-ideal backhaul, or via X2 signaling or Xn signaling. This can also confirm the consistency of activated BWPs between TRPs.

[0152] Figure 8 : is a diagram showing an example of BWP switching in the second mode of the second embodiment. Figure 8 In, with Figure 7 The following explanation will focus on the differences between Figure 8 In TRP#1 and #2, a specific timer (here, TRP#1) is set or determined as the TRP for controlling BWP switching.

[0153] For example, in Figure 8In the example, the UE detects DCI (PDCCH) transmitted from TRP#1 in time slot #0 and therefore starts the above-mentioned timer for TRP#1. Furthermore, the UE detects DCI (PDCCH) transmitted from TRP#2 in time slot #1 and therefore starts the above-mentioned timer for TRP#2. Furthermore, the UE detects DCI (PDCCH) transmitted from TRP#1 in time slot #2 and therefore restarts the above-mentioned timer for TRP#1.

[0154] exist Figure 8 In time slot #n-2, the timer started by TRP#2 expires. Since this TRP#2 is a timer other than the above-mentioned specific timer, BWP switching is not performed.

[0155] On the other hand, in time slot #n-1, since the timer restarted by the specific TRP#1 expires, the UE can also start switching from the activated BWP BWP#1 to BWP#2 in time slot #n. The UE can also receive PDSCH or send PUSCH after BWP#2 in time slot n+Y. The UE can also Figure 1B As described in , during period Y, no UL signal transmission or DL ​​signal reception is requested.

[0156] In addition, Figure 8 In the example, the timer is started even if it is not a specific TRP but TRP#2, but the timer of TRP#2 does not need to be started.

[0157] In the second mode, BWP switching is controlled based on the expiration of a timer in a specific TRP, so that BWP switching can be controlled simply without monitoring the expiration of timers in multiple TRPs.

[0158] <Third Mode>

[0159] In the third mode, timer-based BWP switching in multiple PDCCHs may not be supported. Alternatively, when multiple PDCCHs are configured for a UE, timer-based BWP switching may not be configured for the UE.

[0160] In the third mode, a BWP may not be configured in each serving cell (carrier) configured for the UE. Alternatively, the UE may not be configured to receive or transmit in any BWP within the serving cell based on higher layer parameters (e.g., "BWP-Downlink" or "BWP-Uplink" in the RRC IE).

[0161] When a specific number of BWP sets (e.g., a maximum of 4 DL BWPs or a maximum of 4 UL BWPs) is set based on higher-layer parameters (e.g., "BWP-Downlink" or "BWP-Uplink" of RRC IE), the UE may ignore the BI even if it exists in the DCI (e.g., DCI format 1_1 or 0_1).

[0162] In the third mode, the UE may also determine the activation BWP semi-statically. For example, the activation BWP may be configured for the UE based on system information (e.g., SIB1), higher-layer parameters common within the cell (e.g., "initialDownlinkBWP" in the "DownlinkConfigCommon" field of the RRC IE), or higher-layer parameters specific to the UE (e.g., "BWP-Downlink" in the "ServingCellConfig" field of the RRC IE).

[0163] Alternatively, activation of the BWP may follow an RRC configuration or RRC reconfiguration. The UE may also semi-statically configure activation of the BWP using RRC parameters.

[0164] In addition, when multiple BWPs are configured for the UE, one of the multiple BWPs may be configured as the active BWP for the UE via RRC parameters or MAC CE. Alternatively, the UE may determine the active BWP from the multiple BWPs according to a specific rule (e.g., the lowest or largest BWP index).

[0165] <Support / Action Mode Control>

[0166] Whether timer-based BWP switching is supported may also be explicitly or implicitly indicated to the UE. In the case of explicit indication, the UE may also receive information indicating whether timer-based BWP switching is supported (BWP switching information), and decide whether to support timer-based BWP switching based on the information.

[0167] For example, when the BWP switching information indicates support for timer-based BWP switching (e.g., enabled (on)), the UE may also decide to support timer-based BWP switching. On the other hand, when the BWP switching information indicates support for timer-based BWP switching (e.g., disabled (off)), the UE may also decide not to support timer-based BWP switching even if multiple BWPs are set in the serving cell.

[0168] On the other hand, in the case of implicit indication, the UE may also decide whether to support timer-based BWP switching based on at least one of the number of BWPs set in the serving cell, the type of connection between multiple TRPs (e.g., ideal backhaul or non-ideal backhaul), the type of delay, the type of PDCCH (also known as, for example, single PDCCH or multiple PDCCHs, scheduling type, etc.), and the type of DMRS port group.

[0169] For example, when multiple BWPs are configured in the serving cell, the UE may decide to support timer-based BWP switching. On the other hand, when multiple BWPs are not configured in the serving cell (when only one BWP is configured in the serving cell, or when a single activated BWP exists in the serving cell that is the same as or different from the initial BWP), the UE may decide not to support timer-based BWP switching.

[0170] Furthermore, in timer-based BWP switching, one of the first to third modes may be supported. For example, if the UE decides to support timer-based BWP switching, it may operate in either the first or second mode.

[0171] Alternatively, at least two of the first to third modes may be supported, and the operation mode of timer-based BWP switching may be determined by higher-layer parameters. This operation mode may also be indicated to the UE explicitly or implicitly.

[0172] In the case of explicit instruction, the UE may receive information indicating an operation mode of timer-based BWP switching (operation mode information) and operate in the operation mode indicated by the information.

[0173] On the other hand, in the case of implicit indication, the UE may also determine the action mode based on at least one of the number of BWPs set in the serving cell, the type of connection between multiple TRPs (e.g., ideal backhaul or non-ideal backhaul), the type of delay, the type of PDCCH (e.g., also called single PDCCH or multiple PDCCHs, scheduling type, etc.), and the type of DMRS port group.

[0174] As described above, in the second embodiment, it is possible to appropriately control the timer-based BWP switching in the multi-PDCCH.

[0175] (Other methods)

[0176] The UE may also support at least one of the first DCI-based BWP switching and the second timer-based BWP switching. The types of BWP switching supported may also be explicitly or implicitly notified to the UE.

[0177] In the case of explicit indication, the UE may also receive information indicating any one of the types of BWP switching (eg, DCI-based BWP switching or timer-based BWP switching) and act in the action mode indicated by the information.

[0178] On the other hand, in the case of implicit indication, the UE may also determine the type of BWP switching based on at least one of the number of BWPs set in the serving cell, the type of connection between multiple TRPs (e.g., ideal backhaul or non-ideal backhaul), the type of delay, the type of PDCCH (e.g., also known as single PDCCH or multiple PDCCHs, scheduling type, etc.), and the type of DMRS port group.

[0179] In addition, the first mode of the first or second method can also be applied in an ideal backhaul. In multiple TRPs connected via an ideal backhaul, the BWP switching of the first mode can also be used.

[0180] In addition, the second or third mode of the first or second method can also be applied to non-ideal backhaul or ideal backhaul with large delay. In multiple TRPs connected via non-ideal backhaul or ideal backhaul with large delay, BWP switching of the second or third mode can also be used.

[0181] (Wireless Communication System)

[0182] The following describes a configuration of a wireless communication system according to an embodiment of the present disclosure. In this wireless communication system, communication is performed using one or a combination of the wireless communication methods according to the above-described embodiments of the present disclosure.

[0183] Figure 9 This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP) or the fifth generation mobile communication system New Radio (5G NR).

[0184] In addition, the wireless communication system 1 can also support dual connectivity between multiple radio access technologies (Radio Access Technologies) (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0185] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0186] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0187] The wireless communication system 1 may also include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are narrower than the macrocell C1. User terminals 20 may also be located within at least one of the cells. The arrangement and number of cells and user terminals 20 are not limited to those shown in the figure. Hereinafter, when not distinguishing between base stations 11 and 12, they are collectively referred to as base stations 10.

[0188] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CCs) and dual connectivity (DC).

[0189] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (sub-6 GHz), and FR2 may be a frequency band higher than 24 GHz (above-24 GHz). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to this. For example, FR1 may also correspond to a frequency band higher than FR2.

[0190] Furthermore, the user terminal 20 may communicate in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0191] Multiple base stations 10 can also be connected by wired (for example, optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (for example, NR communication). For example, when NR communication is used as a backhaul between base stations 11 and 12, the base station 11 equivalent to the upper station can also be called an integrated access backhaul (IAB) donor, and the base station 12 equivalent to the relay station can also be called an IAB node.

[0192] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0193] The user terminal 20 may also be a terminal that supports at least one of communication methods such as LTE, LTE-A, and 5G.

[0194] In the wireless communication system 1, a radio access scheme based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and uplink (UL), cyclic prefix OFDM (CP-OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), orthogonal frequency division multiple access (OFDMA), or single carrier frequency division multiple access (SC-FDMA) may be used.

[0195] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be applied to the UL and DL radio access schemes.

[0196] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. can also be used.

[0197] In addition, in the wireless communication system 1, as uplink channels, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. can also be used.

[0198] The PDSCH is used to transmit user data, higher-layer control information, and system information blocks (SIBs). The PUSCH can also be used to transmit user data, higher-layer control information, and the PBCH can also be used to transmit master information blocks (MIBs).

[0199] The lower layer control information may also be transmitted via the PDCCH. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information for at least one of the PDSCH and the PUSCH.

[0200] In addition, the DCI that schedules the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI that schedules the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be interpreted as DL data, and the PUSCH may also be interpreted as UL data.

[0201] In PDCCH detection, a control resource set (CORESET) and a search space can also be used. A CORESET corresponds to the resources for searching for DCI. A search space corresponds to the search area and search method for PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space settings.

[0202] A search space may also correspond to PDCCH candidates that match one or more aggregation levels. One or more search spaces may also be referred to as a search space set. Furthermore, the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in this disclosure may be used interchangeably.

[0203] Uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also known as hybrid automatic repeat request (HARQ-ACK)), ACK / NACK, etc.), and scheduling request (SR) may also be transmitted via the PUCCH. A random access preamble used to establish a connection with a cell may also be transmitted via the PRACH.

[0204] In the present disclosure, downlink, uplink, etc. may be expressed without the word "link." Furthermore, various channels may be expressed without the word "Physical" at the beginning.

[0205] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted.

[0206] For example, a synchronization signal may be at least one of a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). A signal block containing SSs (PSS, SSS) and PBCHs (and DMRS for PBCHs) may also be referred to as an SS / PBCH block or an SS block (SSB). Furthermore, SSs and SSBs may also be referred to as reference signals.

[0207] In addition, in the wireless communication system 1, as an uplink reference signal (UL-RS), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0208] (Base Station)

[0209] Figure 10 This figure shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission path interface (transmission line interface) 140. Furthermore, more than one of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140 may be provided.

[0210] In addition, in this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0211] 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 that are described based on the common knowledge in the technical field to which this disclosure relates.

[0212] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. It may also control transmission and reception, measurement, etc., using the transmission and reception unit 120, the transmission and reception antennas 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting up, releasing, etc.) of communication channels, manage the status of the base station 10, manage radio resources, etc.

[0213] The transceiver unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transceiver circuit, and the like, which are described based on the common knowledge in the technical field involved in this disclosure.

[0214] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0215] The transmitting and receiving antenna 130 can be formed of an antenna described based on the common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0216] The transmitting and receiving unit 120 may also transmit the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the aforementioned uplink channel, uplink reference signal, etc.

[0217] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0218] The sending and receiving unit 120 (sending processing unit 1211) can also perform processing on the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (for example, RLC retransmission control), the Medium Access Control (MAC) layer (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0219] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, discrete Fourier transform (DFT)) processing (as needed), inverse fast Fourier transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0220] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filtering, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0221] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filtering, and demodulation into a baseband signal on the radio frequency band signal received by the transmitting and receiving antenna 130 .

[0222] The transmitting and receiving unit 120 (receiving processing unit 1212) can also apply receiving processing such as analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0223] The transmitting and receiving unit 120 (measuring unit 123) may also perform measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (RRM) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (RSRP)), received quality (e.g., reference signal received quality (RSRQ)), signal to interference plus noise ratio (SINR), signal to noise ratio (SNR)), signal strength (e.g., received signal strength indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0224] The transmission path interface 140 can also send and receive signals (return signaling) between the devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0225] In addition, the transmitting unit and the receiving unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 120 , the transmitting and receiving antenna 130 , and the transmission path interface 140 .

[0226] In addition, the transmitting and receiving unit 120 may also transmit the downlink control information from at least one of a plurality of transmission and reception points (TRPs) for transmitting the downlink shared channel in the first bandwidth part (BWP) within the carrier.

[0227] The downlink control information may also include a specific field value indicating a second bandwidth part (BWP) within the carrier (first embodiment). The control unit 110 may also control switching from the first BWP to the second BWP for the plurality of TRPs.

[0228] The control unit 110 may also control the decision of BWP switching in each of the plurality of TRPs or in a specific TRP. For example, the control unit 110 may also control the sending and receiving of information related to BWP switching between the plurality of TRPs.

[0229] (User Terminal)

[0230] Figure 11 This figure shows an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Furthermore, more than one of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may be provided.

[0231] In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, but it is also assumed that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0232] 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 that are described based on the common knowledge in the technical field to which this disclosure relates.

[0233] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission, reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals and forward them to the transmission and reception unit 220.

[0234] The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may also include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may include a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, and the like, which are described based on the common knowledge in the technical field involved in this disclosure.

[0235] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0236] The transmitting and receiving antenna 230 can be formed of an antenna described based on the common knowledge in the technical field to which this disclosure relates, such as an array antenna.

[0237] The transmitting and receiving unit 220 may also receive the aforementioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the aforementioned uplink channel, uplink reference signal, etc.

[0238] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0239] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0240] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filtering, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0241] In addition, whether or not to apply DFT processing may also be based on the transform precoding setting. For a certain channel (e.g., PUSCH), if transform precoding is activated (enabled), the transmitting / receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the aforementioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting / receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the aforementioned transmission processing without performing DFT processing.

[0242] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filtering, amplification, etc. on the baseband signal into a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0243] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may also perform amplification, filtering, and demodulation into a baseband signal on the radio frequency band signal received via the transmitting and receiving antenna 230 .

[0244] The transmitting and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filtering processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0245] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to received signals. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, etc. based on the received signals. The measuring unit 223 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 210.

[0246] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be constituted by at least one of the transmitting and receiving unit 220 , the transmitting and receiving antenna 230 , and the transmission path interface 240 .

[0247] In addition, the transmitting and receiving unit 220 may also receive downlink control information from at least one of a plurality of transmission and reception points (TRPs) for transmitting the downlink shared channel in the first bandwidth part (BWP) within the carrier.

[0248] The downlink control information may also include a specific field value indicating a second bandwidth part (BWP) within the carrier (first embodiment). The control unit 210 may also control switching from the first BWP to the second BWP for the plurality of TRPs.

[0249] The control unit 210 may also not expect the second BWP represented by the specific field value to be different between the multiple TRPs when receiving the downlink control information from each of the multiple TRPs in the same time slot (first way, first mode).

[0250] The control unit 210 may also control the switching from the first BWP to the second BWP of the multiple TRPs (first method, second mode) based on the downlink control information received from a specific TRP among the multiple TRPs.

[0251] The control unit 210 may not support DCI-based BWP switching, but may semi-statically set an active BWP (first mode, third mode).

[0252] In addition, the transmitting and receiving unit 220 may also receive downlink control information from at least one of a plurality of transmission and reception points (TRPs) for transmitting the downlink shared channel in the first bandwidth part (BWP) within the carrier.

[0253] The control unit 210 may also control the switching of multiple TRPs from the first BWP to the second BWP based on a specific timer activated by receiving the downlink control information (second method).

[0254] When the specific timer started by any TRP among the plurality of TRPs expires, the control unit 210 may also control switching from the first BWP to the second BWP with respect to the plurality of TRPs (second manner, first mode).

[0255] When the specific timer started by any TRP among the plurality of TRPs expires, the control unit 210 may also control switching from the first BWP to the second BWP with respect to the plurality of TRPs (second manner, first mode).

[0256] The control unit 210 may not support the timer-based BWP switching and may semi-statically set the active BWP (second mode, third mode).

[0257] (Hardware Structure)

[0258] In addition, the block diagrams used in the description of the above embodiments show blocks of functional units. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more physically or logically separated devices can be directly or indirectly connected (for example, by wired, wireless, etc.) and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0259] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any of them are as described above, and the implementation method is not particularly limited.

[0260] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 10This figure shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. The base station 10 and user terminal 20 described above can also 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.

[0261] In addition, in this disclosure, the terms such as device, circuit, equipment, section, and unit are interchangeable. The hardware structure 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 to exclude some of the devices.

[0262] For example, although only one processor 1001 is shown, multiple processors may be provided. Furthermore, processing may be performed by a single processor, or by two or more processors simultaneously, sequentially, or using other methods. Furthermore, processor 1001 may be implemented using more than one chip.

[0263] Regarding the various functions in the base station 10 and the user terminal 20, for example, they are achieved by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0264] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a computing device, registers, etc. For example, at least a portion of the aforementioned control unit 110 (210) and the transmitting and receiving unit 120 (220) may also be implemented by the processor 1001.

[0265] In addition, 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 performs various processes based on the program. As a program, a program that causes a computer to perform at least a portion of the operations described in the above embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks can also be implemented similarly.

[0266] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other appropriate storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program code), software modules, etc. for implementing the wireless communication method according to one embodiment of the present disclosure.

[0267] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical / magnetic disk (such as a compact disk (Compact Disc ROM (CD-ROM)), etc.), a digital versatile disk, a Blu-ray disk, a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, or a key drive), a magnetic stripe, a database, a server, or other appropriate storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0268] The communication device 1004 is hardware (a transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. To implement at least one of frequency division duplex (FDD) and time division duplex (TDD), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like. For example, the aforementioned transmitting and receiving unit 120 (220) and the transmitting and receiving antenna 130 (230) may also be implemented by the communication device 1004. The transmitting and receiving unit 120 (220) may also be physically or logically separated from the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0269] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, light emitting diode (LED) lamp, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrated (e.g., a touch panel).

[0270] Furthermore, the processor 1001, memory 1002, and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0271] Furthermore, the base station 10 and user terminal 20 may also be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA). Such hardware may be used to implement part or all of the functional blocks. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0272] (Variation)

[0273] In addition, the terms described in this disclosure and the terms required for understanding this disclosure may also be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be replaced with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, or may be referred to as a pilot, pilot signal, etc. depending on the applied standard. In addition, a component carrier (CC) may also be referred to as a cell, frequency carrier, carrier frequency, etc.

[0274] A radio frame can also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) that constitute a radio frame can also be called a subframe. Furthermore, a subframe can also be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the parameter set (numerology).

[0275] Here, a parameter set may also refer to communication parameters applied to at least one of the transmission and reception of a signal or channel. For example, a parameter set may also represent at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, radio frame structure, specific filtering processing performed by the transmitter and receiver in the frequency domain, specific windowing processing performed by the transmitter and receiver in the time domain, and the like.

[0276] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0277] A time slot may also contain multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as PDSCH (PUSCH) mapping type B.

[0278] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units used for signal transmission. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective equivalents. Furthermore, the terms frame, subframe, time slot, mini-time slot, and symbol may be used interchangeably in this disclosure.

[0279] For example, a subframe can also be called a TTI, multiple consecutive subframes can also be called a TTI, and a time slot or a mini-time slot can also be called a TTI. In other words, at least one of the subframe and the TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. In addition, the unit representing the TTI can also be called a time slot, a mini-time slot, etc. instead of a subframe.

[0280] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules each user terminal by allocating radio resources (such as the frequency bandwidth and transmit power available to each user terminal) in TTI units. The definition of TTI is not limited to this.

[0281] The TTI may also be a unit of time for transmitting channel-coded data packets (transport blocks), code blocks, code words, etc., and may also be a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is given, the time interval (e.g., the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

[0282] Furthermore, when a time slot or a mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) may also be the minimum time unit for scheduling. Furthermore, the number of time slots (mini-time slots) constituting the minimum time unit for scheduling may also be controlled.

[0283] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel. 8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini-slot, a subslot, a time slot, etc.

[0284] In addition, long TTI (for example, normal TTI, subframe, etc.) can also be interpreted as TTI with a time length exceeding 1ms, and short TTI (for example, shortened TTI, etc.) can also be interpreted as TTI with a TTI length smaller than long TTI and greater than 1ms.

[0285] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it may also include one or more consecutive subcarriers (subcarriers). The number of subcarriers included in an RB can also be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers included in an RB can also be determined based on the parameter set.

[0286] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks.

[0287] In addition, one or more RBs may also be referred to as 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, an RB pair, etc.

[0288] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0289] A Bandwidth Part (BWP) (also referred to as a fractional bandwidth) can also represent a subset of contiguous common resource blocks (RBs) used for a parameter set within a carrier. Common RBs can also be identified by their index relative to the common reference point of the carrier. PRBs can also be defined within a BWP and numbered within that BWP.

[0290] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured within one carrier.

[0291] At least one of the configured BWPs may be activated, and the UE may not assume that it will transmit or receive specific signals / channels outside of the activated BWP. In addition, "cell," "carrier," etc. in this disclosure may also be interpreted as "BWP."

[0292] The above-mentioned structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots within a slot, the number of symbols and RBs within a slot or mini-slot, the number of subcarriers within an RB, the number of symbols within a TTI, the symbol length, and the cyclic prefix (CP) length.

[0293] Furthermore, the information and parameters described in this disclosure may be expressed as absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may be indicated by specific indexes.

[0294] In this disclosure, the names used for parameters, etc., are not intended to be limiting in any respect. Furthermore, the mathematical formulas for these parameters, etc., may differ from those explicitly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not intended to be limiting in any respect.

[0295] Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referred to throughout the foregoing description may also be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0296] Furthermore, information, signals, etc. can be output from a higher layer (upper layer) to a lower layer (lower layer), or from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0297] Input and output information, signals, etc. can be stored in a specific location (e.g., memory) or managed using a management table. Input and output information, signals, etc. can be overwritten, updated, or appended. Output information, signals, etc. can also be deleted. Input information, signals, etc. can also be sent to other devices.

[0298] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0299] In addition, physical layer signaling may also be referred to as Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as RRC message, for example, RRC Connection Setup message, RRC Connection Reconfiguration message, etc. In addition, MAC signaling may also be notified using MAC Control Element (CE), for example.

[0300] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0301] The determination can be made by a value represented by a bit (0 or 1), a true or false value (Boolean value) represented by true (true) or false (false), or by comparison of numerical values ​​(for example, comparison with a specific value).

[0302] Whether software is called software, firmware, middleware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software module, application, software application, software package, routine, sub-routine, object, executable file, execution thread, procedure, function, etc.

[0303] Furthermore, software, instructions, information, and the like may also be transmitted and received via a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0304] The terms "system" and "network" used in this disclosure can be used interchangeably. "Network" may also refer to devices included in the network (eg, base stations).

[0305] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)" "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0306] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "transmission point (TP)", "reception point (RP)", "transmission / reception point (TRP)")", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. In some cases, a base station may be referred to as a macro cell, a small cell, a femto cell, or a pico cell.

[0307] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station (Remote Radio Head (RRH)) for indoor use). Terms such as "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of a base station and a base station subsystem providing communication services within that coverage area.

[0308] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” are used interchangeably.

[0309] A mobile station is also sometimes referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent, a mobile client, a client, or some other appropriate terminology.

[0310] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a wireless communication device, etc. Furthermore, at least one of the base station and the mobile station may also be a device mounted on a mobile object, a mobile object itself, etc. The mobile object may be a vehicle (e.g., a vehicle, an aircraft, etc.), a mobile object that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). Furthermore, at least one of the base station and the mobile station may also include a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0311] In addition, the base station in the present disclosure can also be interpreted as a user terminal. For example, the various methods / implementations of the present disclosure can also be applied to a structure in which the communication between a base station and a user terminal is replaced by communication between multiple user terminals (for example, it can also be called device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it can also be set as a structure in which the user terminal 20 has the functions of the above-mentioned base station 10. In addition, expressions such as "uplink" and "downlink" can also be interpreted as expressions corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be interpreted as side channels.

[0312] Likewise, the user terminal in the present disclosure may also be interpreted as a base station. In this case, the base station 10 may also have the functions of the user terminal 20 described above.

[0313] In the present disclosure, actions are assumed to be performed by a base station, and sometimes, depending on the circumstances, by its upper node. Obviously, in a network including one or more network nodes including a base station, various actions performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME)), a Serving-Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0314] The various methods / implementations described in this disclosure may be used individually or in combination, and may be switched between them during execution. Furthermore, the processing procedures, sequences, flow charts, and the like of the various methods / implementations described in this disclosure may be reversed as long as they do not conflict. For example, the elements of various steps described in this disclosure are presented in an illustrative order, but are not limited to the specific order presented.

[0315] The various modes and embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future Generation Radio Access (FX), Global System for Mobile Communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.17 (WiMAX (registered trademark)), IEEE 802.18 (WiMAX (registered trademark)), IEEE 802.19 (WiMAX (registered trademark)), IEEE 802.20 (WiMAX (registered trademark)), IEEE 802.21 (WiMAX (registered trademark)), IEEE 802.22 (WiMAX (registered trademark)), IEEE 802.23 (WiMAX (registered trademark)), IEEE 802.24 (WiMAX (registered trademark)), IEEE 802.25 (WiMAX (registered trademark)), IEEE 802.26 (WiMAX (registered trademark)), IEEE 802.27 (WiMAX (registered trademark)), IEEE 802.28 (WiMAX (registered trademark)), IEEE 802.29 (WiMAX (registered trademark)), IEEE 802.30 (WiMAX (registered trademark)), IEEE 802.31 (WiMAX (registered trademark)), IEEE 802.32 (WiMAX (registered trademark)), IEEE 802.33 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these. In addition, multiple systems can also be combined for application (for example, LTE or LTE-A combined with 5G, etc.).

[0316] The phrase “based on” used in this disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on.”

[0317] Any reference to an element using the designations "first," "second," etc., as used in this disclosure, does not necessarily define the quantity or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to a first and a second element does not necessarily imply that only two elements may be used, or that the first element necessarily takes precedence over the second element in some manner.

[0318] The term "determining" as used in this disclosure may encompass a variety of actions. For example, "determining" may also be considered as "judging," calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), ascertaining, etc.

[0319] In addition, "judgment (decision)" can also be regarded as a situation of "judgment (decision)" on receiving (for example, receiving information), transmitting (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc.

[0320] In addition, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can also be regarded as a situation in which "judgment (decision)" is made on some actions.

[0321] In addition, "judgment (decision)" can also be interpreted as "assuming", "expecting", "considering", etc.

[0322] The "maximum transmit power" recorded in this disclosure may refer to the maximum value of the transmit power, the nominal maximum transmit power (the nominal UE maximum transmit power), or the rated maximum transmit power (the rated UE maximum transmit power).

[0323] As used in this disclosure, the terms "connected," "coupled," and all variations thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between the two elements being "connected" or "coupled." The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may also be interpreted as "access."

[0324] In the present disclosure, when two elements are connected, it can be considered that they are "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy with wavelengths in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc. as several non-limiting and non-inclusive examples.

[0325] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other." Alternatively, the term may also mean "A and B are each different from C." Terms such as "separate" and "bound" may also be interpreted as meaning "different."

[0326] In this disclosure, when the terms "include," "including," and variations thereof are used, these terms, like the term "comprising," have an inclusive meaning. Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0327] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure may also include a case where the noun following the article is in a plural form.

[0328] While the inventions disclosed herein have been described in detail above, it will be apparent to those skilled in the art that the inventions disclosed herein are not limited to the embodiments described herein. The inventions disclosed herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the descriptions in this disclosure are for illustrative purposes only and are not intended to limit the inventions disclosed herein in any way.

Claims

1. A user terminal, characterized in that: have: a receiving unit configured to receive, from at least one of a plurality of transmit / receive points (TRPs) for transmitting a downlink shared channel in a first bandwidth part (BWP) within a carrier, downlink control information including a specific field value indicating a second bandwidth part (BWP) within the carrier; as well as a control unit configured to control switching from the first BWP to the second BWP with respect to the plurality of TRPs, When the control unit receives the downlink control information from each of the multiple TRPs in the same time slot, it controls the switching according to the specific field value of the downlink control information from the first TRP selected by a specific rule, and uses the specific field value of the downlink control information from TRPs other than the first TRP for at least one of time domain resource allocation, frequency domain resource allocation, and downlink allocation index.

2. A wireless communication method for a user terminal, characterized in that: The step of receiving downlink control information from at least one of a plurality of transmit / receive points (TRPs) transmitting a downlink shared channel in a first bandwidth part (BWP) within a carrier, the downlink control information including a specific field value indicating a second bandwidth part (BWP) within the carrier; as well as controlling a switching step from the first BWP to the second BWP with respect to the plurality of TRPs, When the downlink control information is received from each of the multiple TRPs in the same time slot, the switching is controlled according to the specific field value of the downlink control information from the first TRP selected by a specific rule, and the specific field value of the downlink control information from TRPs other than the first TRP is used for at least one of time domain resource allocation, frequency domain resource allocation, and downlink allocation index.

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