Monitoring of downlink control channels for multi-transmission-reception point communications

Abstract

Methods and apparatuses for PDCCH candidate indication and determination. A method of operating a UE includes determining a capability of the UE to monitor PDCCH candidates with a determined number of cells, where the determined number of cells is a number of cells that the UE is capable of monitoring. The method further includes monitoring PDCCH candidates in an active DL BWP of a scheduling cell using an SCS configuration mu based on at least one of the determined number of cells or the capability of the UE, where the UE is configured with a predetermined number of cells.

Description

Technical Field

[0001] This disclosure relates to wireless communication systems. More specifically, this disclosure relates to the transmission of physical downlink control channels (PDCCH) from multiple transmit / receive points (TRPs) to user equipment (UE). Background Technology

[0002] To meet the increasing demand for wireless data traffic since the deployment of fourth-generation (4G) communication systems, efforts have been made to develop improved fifth-generation (5G) or pre-5G communication systems. 5G or pre-5G communication systems are also known as "beyond 4G networks" or "post-long term evolution (LTE) systems." 5G communication systems are considered to be implemented in higher (mmWave) frequency bands, such as the 60 GHz band, to achieve higher data rates. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-size MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies have been discussed relative to 5G communication systems. Furthermore, improvements are being developed in 5G communication systems based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, system networks, cooperative communication, cooperative multipoint (CoMP), and receiver interference cancellation.

[0003] In 5G systems, hybrid frequency shift keying (FSK), Feher's quadrature amplitude modulation (FQAM), and sliding window superposition coding (SWSC) have been developed as advanced coding and modulation (ACM), as well as filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code division multiple access (SCMA) as advanced access technologies.

[0004] The Internet is a human-centric, interconnected network where people generate and consume information. Today, the Internet is evolving into the Internet of Things (IoT), enabling information exchange and processing by distributed entities, such as objects, without human intervention. The Internet of Everything (IoE) has emerged, a combination of IoT technologies and big data processing technologies enabled by connections to cloud servers. Because the implementation of the IoT requires corresponding technological elements such as sensing technology, wired / wireless communication and network infrastructure, service interface technology, and security technology, there has been recent research on sensor networks, machine-to-machine (M2M) communication, machine-type communication (MTC), and so on. Such IoT environments can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated between interconnected objects. Through the integration and combination of existing information technology (IT) with various industrial technologies, the IoT can be applied to a wide range of fields, including smart homes, smart buildings, smart cities, smart or connected cars, smart grids, healthcare, smart appliances, and advanced medical services.

[0005] Accordingly, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communication can be implemented through beamforming, MIMO, and array antennas. The application of cloud RAN, as a big data processing technology, can also be considered an example of the convergence between 5G and IoT technologies.

[0006] As mentioned above, various services can be provided based on the development of wireless communication systems, thus requiring a method for easily providing such services. Summary of the Invention

[0007] [Technical Issues]

[0008] Methods and apparatus for PDCCH candidate indication and determination. A method for operating a UE includes: determining the UE's capability to monitor PDCCH candidates given a determined number of cells, wherein the determined number of cells is the number of cells the UE is capable of monitoring. The method further includes using an SCS configuration μ to monitor PDCCH candidates in an active DL BWP of a scheduled cell based on at least one of the determined number of cells or the UE's capability, wherein the UE is configured with a predetermined number of cells. Attached Figure Description

[0009] To gain a more complete understanding of this disclosure and its advantages, reference will now be made to the following description taken in conjunction with the accompanying drawings, in which the same reference numerals denote the same parts:

[0010] Figure 1An example wireless network according to an embodiment of this disclosure is shown;

[0011] Figure 2 An example gNB is shown according to an embodiment of this disclosure;

[0012] Figure 3 An example UE is shown according to an embodiment of this disclosure;

[0013] Figure 4A Example downlink (DL) slot structures according to several embodiments of the present disclosure are shown;

[0014] Figure 4B Example uplink (UL) slot structures for PUSCH or PUCCH transmission according to several embodiments of this disclosure are shown;

[0015] Figure 5A Example transmitter structures according to several embodiments of this disclosure are shown;

[0016] Figure 5B Example receiver structures according to several embodiments of the present disclosure are shown;

[0017] Figure 6 This invention illustrates a method for determining CCEs for PDCCH candidates according to several embodiments of the present disclosure;

[0018] Figure 7 The scheduling of first PDSCH reception and second PDSCH reception according to several embodiments of the present disclosure is illustrated;

[0019] Figure 8 This invention illustrates a method for determining a set of CSS (CSS) to monitor two TRPs of a cell according to several embodiments of the present disclosure;

[0020] Figure 9 This disclosure illustrates a method for monitoring PDCCH in DCI format according to several embodiments;

[0021] Figure 10 This invention illustrates a method for determining the TCI state for a TRP set CORESET according to several embodiments of the present disclosure;

[0022] Figure 11 A base station according to an embodiment of this disclosure is shown; and

[0023] Figure 12 A user equipment (UE) according to an embodiment of this disclosure is shown. Detailed Implementation

[0024] This disclosure relates to monitoring downlink control channels used for communication with multiple TRPs.

[0025] In one embodiment, a user equipment (UE) is provided. The UE includes: a transmitter configured to transmit a first capability value; and a receiver configured to receive data scheduled by a physical downlink control channel (PDCCH) having a subcarrier spacing (SCS) configuration μ. The configuration of each downlink cell, and for In The UE further includes a processor operatively connected to the receiver, configured to configure μ for each SCS based on a first capability value. The configuration includes a first set of indices for a first control resource set (CORESET) and a second set of indices for a second CORESET. The number of communities and The number of cells determines the total number of PDCCH candidates for each time slot. in The receiver is further configured to receive The number of PDCCH candidates for each cell and each time slot in a given cell shall not exceed the minimum of the following values: the total number of PDCCH candidates per time slot. and the maximum number of PDCCH candidates scheduled for each time slot.

[0026] In one embodiment, the transmitter is further configured to transmit a second capability value. and in

[0027] In one embodiment, the transmitter is further configured to transmit a second capability value. and in

[0028] In one embodiment, wherein: The maximum number of CORESETs in any cell within a given cell is three, including the CORESET with index 0; and

[0029] for One community, The maximum number of cores in any cell within a given cell is five, where:

[0030] The maximum number of CORESETs is three, including the CORESET with index 0, and

[0031] The maximum number of second CORESETs is three, including the CORESET with index 0.

[0032] In one embodiment, the receiver is further configured to receive:

[0033] The first PDCCH candidate in the first CORESET of the first cell.

[0034] The second PDCCH candidate in the first core set of the second cell, and

[0035] The physical downlink shared channel (PDSCH) on the second cell is scheduled by downlink control information (DCI) format, which is provided by a PDCCH candidate from the first PDCCH candidate or a PDCCH candidate from the second PDCCH candidate.

[0036] In one embodiment, the receiver is further configured to receive a PDCCH providing downlink control information (DCI) in a format;

[0037] The processor is further configured to determine fields based on the DCI format. The Transmission Configuration Indication (TCI) status of each of the cells in the second CORESET of the cells; and

[0038] The receiver is further configured to receive the PDCCH in the CORESET of the second CORESET from the cell, based on the determined TCI state.

[0039] In one embodiment, the PDCCH is received in a CORESET from a first CORESET or in a CORESET with index 0.

[0040] In another embodiment, a base station is provided. The base station includes: a receiver configured to receive a first capability value; and a transmitter configured to transmit data scheduled by a PDCCH having an SCS configuration μ. The configuration of each downlink cell, and for middle Each cell includes a configuration of a first set of indices for a first core set and a configuration of a second set of indices for a second core set. The base station further includes a processor operatively connected to the transmitter, configured to configure μ for each SCS based on a first capability value. The number of communities and The number of cells determines the total number of PDCCH candidates for each time slot. in

[0041] In one embodiment, wherein:

[0042] The maximum number of CORESETs in any cell within a given cell is three, including the CORESET with index 0; and

[0043] for One community, The maximum number of cores for any cell in the given cells is five, where:

[0044] The maximum number of CORESETs is three, including the CORESET with index 0, and

[0045] The maximum number of second CORESETs is three, including the CORESET with index 0.

[0046] In one embodiment, the transmitter is further configured to transmit: a first PDCCH candidate in a first CORESET of a first cell, a second PDCCH candidate in a first CORESET of a second cell, and a physical downlink shared channel (PDSCH) on the second cell scheduled by downlink control information (DCI) format provided by either a PDCCH candidate from the first PDCCH candidate or a PDCCH candidate from the second PDCCH candidate.

[0047] In one embodiment, the processor is further configured to include in the downlink control information (DCI) format fields for implementing the... The indication received by the PDCCH in the second CORESET of each cell;

[0048] The transmitter is further configured to: transmit a PDCCH in DCI format; and transmit the PDCCH in the second CORESET of the cell based on the indication.

[0049] In one embodiment, wherein:

[0050] The processor is further configured to include information from downlink control information (DCI) in the fields of the downlink control information (DCI) format. The Transmission Configuration Indicator (TCI) status indication for each of the cells in the second CORESET of each cell.

[0051] The transmitter is further configured to: transmit a PDCCH in DCI format; and transmit a PDCCH in a CORESET from a second CORESET of the cell according to the indicated TCI state.

[0052] In one embodiment, the PDCCH is sent in a CORESET from a first CORESET or in a CORESET with index 0.

[0053] In yet another embodiment, a method is provided that enables a UE to determine the maximum number of PDCCH candidates to be received per cell and per timeslot. The method includes: transmitting a first capability value; and receiving PDCCHs scheduled with SCS configuration μ. The configuration of each downlink cell, and for middle The method further includes configuring μ for each SCS, based on a first capability value, and configuring the first set of indexes for the first CORESET and the second set of indexes for the second CORESET. The number of communities and The number of cells determines the total number of PDCCH candidates for each time slot. in The method also includes receiving The number of PDCCH candidates for each cell and each time slot in a given cell shall not exceed the minimum of the following values: the total number of PDCCH candidates per time slot. and the maximum number of PDCCH candidates scheduled for each time slot.

[0054] In one embodiment, the method further includes: sending a second capability value. and in

[0055] In one embodiment, the method further includes: sending a second capability value. as well as

[0056] in

[0057] In one embodiment, wherein:

[0058] The maximum number of CORESETs in any cell within a given cell is three, including the CORESET with index 0; and

[0059] for One community, The maximum number of cores for any cell in the given cells is five, where:

[0060] The maximum number of CORESETs is three, including the CORESET with index 0, and

[0061] The maximum number of second CORESETs is three, including the CORESET with index 0.

[0062] In one embodiment, the method further includes receiving:

[0063] The first PDCCH candidate in the first CORESET of the first cell.

[0064] The second PDCCH candidate in the first core set of the second cell, and

[0065] The physical downlink shared channel (PDSCH) on the second cell is scheduled by downlink control information (DCI) format, which is provided by a PDCCH candidate from the first PDCCH candidate or a PDCCH candidate from the second PDCCH candidate.

[0066] In one embodiment, the method further includes:

[0067] Receive PDCCH in downlink control information (DCI) format;

[0068] Field determination based on DCI format The Transmission Configuration Indication (TCI) status of each of the cells in the second CORESET of the cells; and

[0069] Receive PDCCH in the CORESET of the second CORESET from the cell based on the determined TCI state.

[0070] In one embodiment, the PDCCH is received in a CORESET from a first CORESET or in a CORESET with index 0.

[0071] In one embodiment, a method for operating a user equipment (UE) in a wireless communication system is provided. The method includes: determining the UE's ability to monitor PDCCH candidates given a determined number of cells, wherein the determined number of cells is the number of cells that the UE is capable of monitoring; and using an SCS configuration μ to monitor PDCCH candidates in an active DL BWP of a scheduled cell based on at least one of the determined number of cells or the UE's ability, wherein the UE is configured with a predetermined number of cells.

[0072] In one embodiment, the UE's capabilities include the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs per time slot.

[0073] In one embodiment, the value associated with the predetermined number of cells is greater than the determined number of cells.

[0074] In one embodiment, the UE does not need to monitor more than the total number of PDCCH candidates, wherein the total number of PDCCH candidates is determined based on at least one of the determined number of cells, the maximum number of PDCCH candidates, or the determined number of cells.

[0075] In one embodiment, the UE does not need to monitor more than the total number of non-overlapping CCEs per time slot on the active DL BWP of the scheduling cell, and the total number of non-overlapping CCEs is determined based on at least one of a determined number of cells, a maximum number of non-overlapping CCEs per time slot, or a determined number of cells.

[0076] In one embodiment, the value associated with the predetermined number of cells is equal to or less than the determined number of cells.

[0077] In one embodiment, the UE does not need to monitor more than the total number of PDCCH candidates, and the total number of PDCCH candidates corresponds to the maximum number of PDCCH candidates.

[0078] In one embodiment, the UE does not need to monitor more than the total number of non-overlapping CCEs per time slot of each scheduled cell, and the total number of non-overlapping CCEs per time slot of each scheduled cell corresponds to the maximum number of non-overlapping CCEs per time slot of each scheduled cell.

[0079] In one embodiment, the UE does not need to monitor more than the total number of PDCCH candidates or the total number of non-overlapping CCEs in each time slot of each scheduled cell, wherein the total number of PDCCH candidates is equal to or greater than the maximum number of PDCCH candidates, and wherein the total number of non-overlapping CCEs is greater than the maximum number of non-overlapping CCEs.

[0080] In one embodiment, a user equipment (UE) is provided. The UE includes: a transceiver; and at least one processor coupled to the transceiver and configured to: determine the UE's ability to monitor PDCCH candidates in the presence of a determined number of cells, wherein the determined number of cells is the number of cells that the UE is capable of monitoring; and, based on at least one of the determined number of cells or the UE's ability, use an SCS configuration μ to monitor PDCCH candidates in an active DL BWP of a scheduled cell, wherein the UE is configured with a predetermined number of cells.

[0081] In one embodiment, the UE's capabilities include the maximum number of PDCCH candidates and the maximum number of non-overlapping CCEs per time slot.

[0082] In one embodiment, the value associated with the predetermined number of cells is greater than the determined number of cells.

[0083] In one embodiment, the UE does not need to monitor more than the total number of PDCCH candidates, and the total number of PDCCH candidates is determined based on at least one of the determined number of cells, the maximum number of PDCCH candidates, or the determined number of cells.

[0084] In one embodiment, the value associated with the predetermined number of cells is equal to or less than the determined number of cells.

[0085] In one embodiment, the UE does not need to monitor more than the total number of PDCCH candidates, and the total number of PDCCH candidates corresponds to the maximum number of PDCCH candidates.

[0086] Other technical features can be readily understood by those skilled in the art from the following figures, description and claims.

[0087] Before proceeding with the detailed description below, it may be advantageous to clarify the definitions of certain words and phrases used throughout this disclosure. The term “coupled” and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are physically in contact with each other. The terms “send,” “receive,” and “communicate,” and their derivatives include both direct and indirect communication. The terms “include” and “contain,” and their derivatives mean, but are not limited to, including. The term “or” is inclusive, meaning “and / or.” The phrase “associated with” and its derivatives mean to include, to contain, interconnect, contain, enclose, connected to or linked with, coupled to or coupled with, communicate with, cooperate with, interweave with, juxtapose with, proximate with, bind to or bind with, possess, have its nature, be associated with or be associated with, or similar meanings. The term “controller” refers to any device, system, or part thereof that controls at least one operation. Such controllers may be implemented in hardware or a combination of hardware and software and / or firmware. The functionality associated with any particular controller may be centralized or distributed, either locally or remotely. When used with a series of items, the phrase “at least one of…” means that different combinations of one or more of the listed items may be used, and that only one of the listed items may be required. For example, “at least one of A, B, and C” includes any of the following combinations: A, B, C, A; B, A; C, B, and C; and A, B, and C.

[0088] Furthermore, the various functions described below may be implemented or supported by one or more computer programs, each of which is formed by computer-readable program code and implemented in a computer-readable medium. The terms "application program" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or portions thereof implemented in appropriate computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium that can be accessed by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, optical disc (CD), digital video disc (DVD), or any other type of storage. "Non-transitory" computer-readable medium does not include wired, wireless, optical, or other communication links that transmit transient electrical signals or other signals. Non-transitory computer-readable medium includes media that can permanently store data and media that can store data and be overwritten later, such as rewritable optical discs or erasable storage devices.

[0089] Definitions of certain other words and phrases are provided throughout this disclosure. Those skilled in the art will understand that, in many cases, if not most, these definitions apply to the prior and future use of the defined words and phrases.

[0090] [Invention Model]

[0091] There is a need for improved 5G communication systems. 5G communication systems are implemented in higher (mmWave) frequency bands, such as the 30 GHz band, to achieve higher data rates. User equipment (UE) can communicate with multiple transport nodes (TRPs), a process known as multi-TRP communication. TRPs can belong to the same cell, and the UE can receive or send the same or different transport blocks to different TRPs. Multi-TRP communication can improve data rate or reliability by providing time, frequency, or spatial diversity for the transmission and reception of control or data information. For example, the UE can increase data rate by spatially multiplexing different transport blocks from different TRPs or increase reception robustness and reliability by receiving the same transport blocks from different TRPs. However, when a UE is configured for multi-TRP communication, the UE must monitor the Physical Downlink Control Channel (PDCCH) from multiple TRPs. Monitoring the PDCCH from multiple TRPs presents various challenges.

[0092] The following discussion Figures 1 to 12 The various embodiments used to describe the principles of this disclosure are for illustrative purposes only and should not be construed as limiting the scope of this disclosure in any way. Those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged wireless communication system.

[0093] Depending on the network type, the term "base station" can refer to any component (or set of components) configured to provide wireless access to a network, such as a transmitting point (TP), TRP, gNB, macrocell base station, femtocell base station, WiFi access point (AP), or other wireless-enabled device. A base station can provide wireless access according to one or more wireless communication protocols, such as 5G 3GPP New Radio Interface / Access (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), High-Speed ​​Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, the terms "gNB" and "TRP" are used interchangeably in this disclosure to refer to network infrastructure components that provide wireless access to remote terminals. Furthermore, depending on the network type, the term UE can refer to any component, such as a mobile station, subscription station, remote terminal, wireless terminal, receiving point, or user equipment. A UE can be a mobile device or a fixed device.

[0094] To meet the increasing demand for wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also called "beyond 4G networks" or "post-LTE systems".

[0095] 5G communication systems can be implemented in higher frequency (mmWave) bands, such as 28 GHz or 60 GHz, or typically above 6 GHz, to achieve higher data rates, or in lower frequency bands, such as below 6 GHz, to achieve robust coverage and mobility support. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-size MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies are being considered for implementation in 5G communication systems. Furthermore, improvements to the system network are being developed based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication on sidelinks, wireless backhaul, mobile networks, cooperative communication, cooperative multipoint (CoMP) transmission / reception (e.g., transmission / reception from multiple TRPs), and receiver interference cancellation.

[0096] Since some embodiments of this disclosure can be implemented in 5G systems, the discussion of 5G systems and their associated frequency bands is for reference only. However, this disclosure is not limited to 5G systems or their associated frequency bands, and embodiments of this disclosure can be utilized in conjunction with any frequency band.

[0097] Figure 1 An example wireless network 100 according to several embodiments of the present disclosure is shown. Figure 1 The illustrated embodiment of the wireless network 100 is for illustrative purposes only. Other embodiments of the wireless network 100 may be used without departing from the scope of this disclosure.

[0098] Wireless network 100 includes BS 101, BS 102, and BS 103. BS 101 communicates with BS 102 and BS 103. BS 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a proprietary IP network, or other data network.

[0099] gNB 102 provides wireless broadband access to network 130 to a first plurality of UEs within its coverage area 120. The first plurality of UEs includes UE 111, which may be located within a small business; UE 112, which may be located within an enterprise (E); UE 113, which may be located within a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); and UE 116, which may be a mobile device (M), such as a cellular phone, wireless laptop computer, wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 to a second plurality of UEs within its coverage area 125. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of gNBs 101-103 may communicate with each other and with UEs 111-116 using 5G, LTE, LTE-A, WiMAX, WiFi, or other advanced wireless communication technologies.

[0100] The dashed lines indicate the approximate extent of coverage areas 120 and 125, which are illustrated as nearly circular for illustrative and explanatory purposes only. For example, coverage areas associated with the gNB, such as coverage areas 120 and 125, may have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment related to natural and man-made obstacles.

[0101] although Figure 1 An example of a wireless network 100 is shown, but more details can be found on other networks. Figure 1Various modifications can be made. For example, wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement. gNB 101 can communicate directly with any number of UEs and provide such UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. In addition, gNBs 101, 102 and / or 103 can provide access to other or additional external networks, such as other types of data networks.

[0102] Figure 2 An example gNB 102 according to an embodiment of this disclosure is shown. Figure 2 The embodiment of gNB 102 shown is for illustrative purposes only, and Figure 1 gNBs 101 and 103 can have the same or similar configurations. However, gNBs come in various configurations, and Figure 2 This disclosure is not intended to limit the scope to any particular implementation of gNB.

[0103] like Figure 2 As shown, gNB 102 includes multiple antennas 205a-205n, multiple RF transceivers 210a-210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. gNB 102 also includes a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0104] RF transceivers 210a-210n receive input RF signals from antennas 205a-205n, such as signals transmitted by a UE in network 100. RF transceivers 210a-210n down-convert the input RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 220, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 220 sends the processed baseband signals to controller / processor 225 for further processing.

[0105] The TX processing circuit 215 receives analog or digital data (e.g., voice data, network data, email, or interactive video game data) from the controller / processor 225. The TX processing circuit 215 encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The RF transceivers 210a-210n receive the processed baseband or IF signal from the TX processing circuit 215 and up-convert the baseband or IF signal into an RF signal transmitted via antennas 205a-205n.

[0106] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 225 may control the RF transceivers 210a-210n, the RX processing circuitry 220, and the TX processing circuitry 215 to receive forward channel signals and transmit reverse channel signals, based on known principles. The controller / processor 225 may also support additional functions, such as more advanced wireless communication functions. For example, the controller / processor 225 may transmit downlink control channels for communication with multiple TRPs. The controller / processor 225 may support any of a variety of other functions in the gNB 102.

[0107] The controller / processor 225 is also capable of executing programs and other processes, such as an operating system, residing in the memory 230. The controller / processor 225 can move data into or out of the memory 230 as needed by the executing process.

[0108] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or over a network. The interface 235 can support communication via any suitable wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (e.g., a system supporting 5G, LTE, or LTE-A), the interface 235 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 can allow the gNB 102 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (e.g., the Internet). The interface 235 includes any suitable architecture supporting communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0109] The memory 230 is coupled to the controller / processor 225. A portion of the memory 230 may include RAM, and another portion of the memory 230 may include flash memory or other ROM.

[0110] although Figure 2 An example of gNB 102 is shown, but more can be found for... Figure 2 Various modifications can be made. For example, gNB 102 can include any number of... Figure 2Each component shown. As a specific example, the access point may include multiple interfaces 235, and the controller / processor 225 may support routing functionality to route data between different network addresses. As another specific example, although illustrated as a single instance of TX processing circuitry 215 and a single instance of RX processing circuitry 220, the gNB 102 may include multiple instances of each type of circuitry (e.g., one per RF transceiver). Furthermore, Figure 2 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed.

[0111] Figure 3 An example UE 116 according to an embodiment of this disclosure is shown. Figure 3 The embodiment of UE 116 shown is for illustrative purposes only, and Figure 1 UEs 111-115 can have the same or similar configurations. However, UEs have various configurations, and Figure 3 This disclosure is not intended to limit the scope to any particular implementation of the UE.

[0112] like Figure 3 As shown, UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a TX processing circuit 315, a microphone 320, and an RX processing circuit 325. UE 116 also includes a speaker 330, a processor 340, an input / output (I / O) interface (IF) 345, a touchscreen 350, a display 355, and memory 360. Memory 360 includes an operating system (OS) 361 and one or more application programs 362.

[0113] RF transceiver 310 receives an input RF signal transmitted by a gNB of network 100 from antenna 305. RF transceiver 310 down-converts the input RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signal. RX processing circuitry 325 sends the processed baseband signal to speaker 330 (e.g., for voice data) or to processor 340 for further processing (e.g., for web browsing data).

[0114] The TX processing circuit 315 receives analog or digital voice data from the microphone 320 or other output baseband data (e.g., network data, email, or interactive video game data) from the processor 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal into an RF signal transmitted through the antenna 305.

[0115] The processor 340 may include one or more processors or other processing devices and executes an OS 361 stored in memory 360 to control the overall operation of the UE 116. For example, the processor 340 may control the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 to receive forward channel signals and transmit reverse channel signals according to known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0116] Processor 340 is also capable of executing other processes and programs residing in memory 360, such as processes for monitoring downlink control channels communicating with multiple TRPs. Processor 340 can move data into or out of memory 360 as needed by the executing processes. In some embodiments, processor 340 is configured to execute application 362 based on OS 361 or in response to signals received from a gNB or operator. Processor 340 is also coupled to I / O interface 345, which provides UE 116 with the ability to connect to other devices such as laptops and handheld computers. I / O interface 345 is the communication path between these accessories and processor 340.

[0117] The processor 340 is also coupled to the touchscreen 350 and the display 355. The operator of the UE 116 can use the touchscreen 350 to input data into the UE 116. The display 355 may be a liquid crystal display, a light-emitting diode display, or other display capable of displaying, for example, text and / or at least limited graphics from a website.

[0118] The memory 360 is coupled to the processor 340. A portion of the memory 360 may include random access memory (RAM), and another portion of the memory 360 may include flash memory or other read-only memory (ROM).

[0119] although Figure 3 An example of UE 116 is shown, but it is possible to see more. Figure 3 Make various changes. For example, Figure 3The various components can be combined, further subdivided, or omitted, and additional components can be added as needed. As a specific example, processor 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Furthermore, although... Figure 3 The illustration shows a UE 116 configured as a mobile phone or smartphone, but the UE can be configured to operate as other types of mobile or fixed devices.

[0120] The time unit for DL ​​(Deep Path) or UL (Ultra Path) signaling on a cell is a symbol. A symbol belongs to a time slot that includes multiple symbols, such as 14 symbols, and is called a DL symbol if used for DL ​​signaling, a UL symbol if used for UL signaling, or a flexible symbol if it can be used for either DL or UL signaling. A time slot can also be the time unit for DL ​​or UL signaling on a cell.

[0121] A unit of bandwidth (BW) is called a resource block (RB). An RB comprises multiple subcarriers (SCs), for example, 12 subcarriers. The RB within a symbol of a time slot is called a physical RB (PRB) and comprises multiple resource elements (REs). For example, a time slot may have a duration of 1 millisecond, and the RB may have a bandwidth of 180 kHz and include 12 SCs spaced at 15 kHz intervals. As another example, a time slot may have a duration of 0.25 milliseconds, and the RB may have a BW of 720 kHz and include 12 SCs spaced at 60 kHz intervals.

[0122] DL signals include data signals conveying information content, control signals conveying DL control information (DCI), and reference signals (RS), also known as pilot signals. A gNB, such as gNB 102, can transmit data information or DCI via the corresponding Physical DL Shared Channel (PDSCH) or Physical DL Control Channel (PDCCH). The gNB can transmit one or more of several types of RS, including Channel State Information RS (CSI-RS) and Demodulated RS (DMRS). CSI-RS is primarily used by the UE to perform measurements and provide Channel State Information (CSI) to the gNB. For channel measurements, non-zero power CSI-RS (NZP CSI-RS) resources can be used. For Interference Measurement Reporting (IMR), CSI Interference Measurement (CSI-IM) resources associated with a zero power CSI-RS (ZP CSI-RS) configuration can be used.

[0123] The CSI process may include NZP CSI-RS and CSI-IM resources. A UE, such as UE 116, can determine CSI-RS transmission parameters via DL control signaling from the gNB or higher-level signaling, such as Radio Resource Control (RRC) signaling. The transmission instance of CSI-RS can be indicated by physical layer DL control signaling or configured by higher-level signaling. DMRS is typically received only by the UE in the BW received by the corresponding PDCCH or PDSCH, and the UE can use DMRS to demodulate data or control information.

[0124] For example, Figure 4A The following diagram illustrates a downlink (DL) slot structure according to several embodiments of the present disclosure. Figure 4A The embodiment of the DL time slot structure 400 shown is for illustration only and should not be construed as limiting. Figure 4A This disclosure is not intended to limit the scope to any particular DL time slot structure.

[0125] DL slot 405 includes gNBs that can transmit data information, DCI, or DMRS. 410 symbols. DL system BW includes Each RB includes 1 RB. One SC. UE, for example UE 116, sends a total of BW for PDSCH. SC 415 was assigned M PDSCH Each RB transmits the PDCCH for DCI via control channel elements (CCEs), which are distributed across the entire DL system BW. The gNB 102 can use the first time slot symbol 420 to transmit the PDCCH and DMRS associated with PDCCH demodulation. The gNB 102 can use the second time slot symbol 425 to transmit either the PDCCH or PDSCH. The gNB 102 can use the remaining time slot symbols 430 to transmit the PDSCH, the DMRS associated with each PDSCH, and the CSI-RS. In some time slots, the gNB 102 can also transmit synchronization signals and channels for transmitting system information.

[0126] UL signals also include data signals conveying information content, control signals conveying UL control information (UCI), DMRS associated with data or UCI demodulation, probe RS (SRS) enabling the gNB to perform UL channel measurements, and random access (RA) preamble enabling the UE to perform random access. The UE can transmit data information or UCI through the corresponding Physical UL Shared Channel (PUSCH) or Physical UL Control Channel (PUCCH). When the UE transmits both data information and UCI simultaneously, it can multiplex both in the PUSCH or simultaneously transmit a PUCCH with UCI and a PUSCH with data information and possibly some UCI. UCI includes a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message, indicating correct or incorrect decoding of transport blocks (TB) or code blocks in the PDSCH, indicating whether there is a scheduling request (SR) for data in the UE's buffer, and a CSI report enabling the gNB to select appropriate parameters for PDSCH or PDCCH transmissions to the UE. For systems using hybrid beamforming operations, UCI may also include beam information for the received signal and the corresponding reference signal received power (RSRP) value, such as an index of a set of quasi-matching parameters from multiple sets of quasi-matching parameters.

[0127] The CSI report from the UE may include: a Channel Quality Indicator (CQI), which informs the gNB of the maximum modulation and coding scheme (MCS) for the UE to detect data TB with a predetermined block error rate (BLER) (e.g., 10% BLER); a Precoding Matrix Indicator (PMI), which informs the gNB how signals from multiple transmitter antennas are combined according to the Multiple-Input Multiple-Output (MIMO) transmission principle; and a Rank Indicator (RI) indicating the transmission rank of the PDSCH.

[0128] UL RS includes DMRS and SRS. In some embodiments, DMRS is transmitted only in the BW of the corresponding PUSCH or PUCCH transmission. The gNB can use DMRS to demodulate information in the corresponding PUSCH or PUCCH. SRS is transmitted by the UE to provide ULCSI to the gNB, and for TDD systems, the gNB's SRS reception can also provide PMI for the gNB's DL transmission. Additionally, to establish synchronization or initial RRC connection with the gNB, the UE can transmit a Physical Random Access Channel (PRACH).

[0129] Figure 4B Example time slot structures for PUSCH transmission or PUCCH transmission according to several embodiments of this disclosure are shown. Figure 4B The embodiment of the time slot structure 450 shown is for illustration only and should not be construed as limiting. Figure 4B This disclosure is not intended to limit the scope to any particular time-slot structure.

[0130] Time slot 455 may include a PUSCH or PUCCH that allows a UE, such as UE 116, to transmit data information, UCI, or DMRS. 460 symbols. UL system BW includes Each RB includes 1 RB. SCs. Total number of BWs sent for PUSCH ('X' = 'S') or PUCCH ('X' = 'C'). SC 465 and UE 116 were allocated M PUXCH One or more of the last time slot symbols can be used to multiplex SRS transmissions from UE116 470. PUCCH and PUSCH transmissions can also occur in the same time slot. For example, UE116 can transmit PUSCH in an earlier time slot symbol and PUCCH in a later time slot symbol.

[0131] A hybrid time slot can include a DL (Deep Transmission) area, a guard period area, and a UL (Ultra-Low Transmission) area. For example, the DL transmission area can include PDCCH and PDSCH transmissions, and the UL transmission area can include PUCCH transmissions. DL and UL transmissions can be based on Orthogonal Frequency Division Multiplexing (OFDM) waveforms, including variants using DFT precoding, referred to as DFT-spread-OFDM.

[0132] Figure 5A An example transmitter structure according to several embodiments of the present disclosure is shown. Figure 5A The example transmitter structure 501 shown is for illustrative purposes only and should not be construed as limiting. Figure 5A This disclosure is not intended to limit the scope to any particular transmitter architecture. Figure 5A One or more components shown may be implemented in a dedicated circuit configured to perform the function, or one or more components may be implemented by one or more processors that execute instructions to perform the function. For example, transmitter structure 501 may be implemented in UE 111-116 or gNB 101-103 implementing transmit path 200. Other embodiments may be used without departing from the scope of this disclosure.

[0133] Information bits, such as control bits or data bits 502, are encoded by encoder 504, rate-matched with the allocated time / frequency resources by rate matcher 506, and modulated by modulator 508. Subsequently, the modulated coded symbols and DMRS 510 are mapped to SC 512 by SC mapping unit 514, an inverse fast Fourier transform (IFFT) is performed by filter 516, a cyclic prefix (CP) is added by CP insertion unit 518, and the resulting signal 522 is filtered by filter and transmitted by radio frequency (RF) unit 520.

[0134] Figure 5B An example receiver structure using OFDM is shown according to several embodiments of this disclosure. Figure 5B The example receiver structure 531 shown is for illustrative purposes only and should not be construed as limiting. Figure 5B This disclosure is not intended to limit the scope to any particular receiver architecture. Figure 5B One or more components shown may be implemented in a dedicated circuit configured to perform the function, or one or more components may be implemented by one or more processors that execute instructions to perform the function. For example, receiver structure 531 may be implemented in UE 111-116 or gNB 101-103 implementing receive path 250. Other embodiments may be used without departing from the scope of this disclosure.

[0135] like Figure 5B As shown, the received signal 532 is filtered by filter 534, CP removal unit 536 removes CP, filter 538 applies Fast Fourier Transform (FFT), SC demapping unit 540 demaps the SC selected by BW selector unit 542, the received symbols are demodulated by channel estimator and demodulator unit 544, rate dematcher 546 restores rate matching, and decoder 548 decodes the obtained bits to provide information bits 550.

[0136] When a UE, such as UE 116, indicates a carrier aggregation capability greater than four serving cells, UE 116 also indicates the maximum number of PDCCH candidates that UE 116 can monitor per timeslot when the UE is configured for carrier aggregation operation with more than four cells. When UE 116 is not configured for dual connectivity operation, UE 116 determines the corresponding... The ability to monitor the maximum number of PDCCH candidates per time slot for each downlink cell, of which This is the number of downlink cells configured or indicated by UE 116, for example, if the number of configured cells is greater than 4.

[0137] For each DL BWP configured for UE 116 in the serving cell, P ≤ 3 control resource sets (CORESETs) can be provided to UE 116 by higher-layer signaling. For each CORESET, the following are provided to UE 116: CORESET index p, 0 ≤ p < 12; DM-RS scrambling sequence initialization value; precoder granularity of multiple resource element groups (REGs) in the frequency domain where UE 116 can use the same DM-RS precoder; multiple consecutive symbols of the CORESET; a set of resource blocks (RBs) of the CORESET; CCE to REG mapping parameters; antenna port quasi-co-location, which comes from a set of antenna port quasi-co-locations and indicates the quasi-co-location information of the DM-RS antenna ports received by the PDCCH in the corresponding CORESET; and an indication of the presence or absence of the Transmission Configuration Indicator (TCI) field of DCI format 1_1 sent by the PDCCH in CORESET p.

[0138] For each DL BWP configured for UE 116 in the serving cell, UE 116 can additionally receive S ≤ 10 search space sets from a higher layer. For each search space set from the S search space sets, a search space set index s, 0 ≤ s < 40, is provided to UE 116; the association between search space set s and CORESET p; k s The PDCCH monitoring cycle and o in each time slot s The PDCCH monitoring offset for each time slot; the PDCCH monitoring mode within the time slot, indicating the first(s) of the CORESET within the time slot used for PDCCH monitoring; T s <k s The duration of each time slot indicates the number of aggregation levels L for each control channel element (CCE). The search space set *s* is either a CSS set or a UE-specific search space (USS) set. When the search space set *s* is a CSS set, the UE 116 is provided with corresponding indications regarding whether to monitor PDCCH candidates for DCI formats 0_0 and 1_0, for DCI format 2_0, for DCI format 2_1, for DCI format 2_2, and for DCI format 2_3. The UE 116 may also be provided with an indication regarding whether to monitor PDCCH candidates for DCI format 2_4, which indicates whether to monitor PDCCH candidates during multiple next DRX cycles. When the search space set *s* is a USS set, the UE 116 is provided with corresponding indications regarding whether to monitor PDCCH candidates for DCI formats 0_0 and 1_0 or for DCI formats 0_1 and 1_1.

[0139] UE 116 can determine the PDCCH monitoring timing on the active DL BWP based on the PDCCH monitoring period, PDCCH monitoring offset, and PDCCH monitoring mode within the time slot. For the search space set s, if Then UE 116 is determined to be at number n f The frame number is There are (multiple) PDCCH monitoring opportunities within the time slot. UE 116 from the time slot Initially, targeting T s The PDCCH candidates are monitored in a continuous time slot, and the next k-th time slot is not monitored. s -T s PDCCH candidates for a search space set s of consecutive time slots.

[0140] The USS of CCE aggregation level L ∈ {1, 2, 4, 8, 16} is defined by a set of PDCCH candidates for CCE aggregation level L. For the search space set s associated with CORESET p, the CCE index of aggregation level L is given by Equation 1, and the CCE index of aggregation level L corresponds to the slot of the active DL BWP of the serving cell. PDCCH candidates in the search space set The serving cell corresponds to the carrier indicator field value n CI .

[0141] Equation 1:

[0142]

[0143] In Equation 1, for any CSS, For USS, Y p，-1 =n RNTI ≠0, A p =39827 (for p mod 3 = 0), A p =39829 (for p mod 3 = 1), A p =39839 (for p mod 3 = 2), and D = 65537. In Equation 1, i = 0, ..., L-1. In CORESET p, NCC E，p This refers to the number of CCEs, numbered from 0 to NCC. E，p -1. If the UE is configured to monitor the carrier indicator field of the serving cell on which the PDCCH is monitored, then n CI It is the carrier indicator field value; otherwise, including for any CSS, n CI =0. in It is the number of PDCCH candidates that the UE is configured to monitor at the aggregation level L for the search space set s of the serving cell, where the serving cell corresponds to n. CI For any CSS, For USS, It is all configurations n of the CCE aggregation level L of the search space set s. CI Maximum value For n RNTI The RNTI value is C-RNTI.

[0144] UE 116 can be expected to monitor PDCCH candidates for up to four sizes of DCI formats, including up to three sizes of DCI formats with CRC scrambled by the C-RNTI of each serving cell. UE 116 can calculate the number of DCI format sizes for each serving cell based on the number of PDCCH candidates configured in the corresponding search space set of the corresponding active DLBWP.

[0145] In some embodiments, UE 116 is configured with an active DL BWP having an SCS configuration μ. Downlink cells, among which In these embodiments, UE 116 may not monitor more than [number] times per time slot of each scheduled cell on the active DL BWP of the scheduled cell. PDCCH candidates or more Non-overlapping CCEs.

[0146] In some embodiments, UE 116 is configured with an active DL BWP having an SCS configuration μ. Downlink cells, among which The DL BWP of an activated cell is the active DL BWP of the activated cell, and the DL BWP of a deactivated cell is the DL BWP of the deactivated cell with an index indicated by a higher layer. In these embodiments, UE 116 may not be able to... Each time slot on the DL BWP of one downlink cell (or multiple scheduling cells) monitors more than PDCCH candidates or more Non-overlapping CCEs.

[0147] For each scheduled cell, UE 116 may configure μ of active DL BWP monitoring per time slot for the SCS with the scheduled cell. PDCCH candidates or more There are 2 non-overlapping CCEs. For SCS configuration μ, the corresponding SCS is 2. μ 15kHz.

[0148] UE 116 may not be configured with a CCS set, which results in an excess of the maximum number of monitored PDCCH candidates and the number of non-overlapping CCEs per time slot for the total or per scheduled cell. For intra-cell scheduling (self-scheduling) or cross-carrier scheduling for a DL BWP with SCS configuration μ in the scheduled cell, UE 116 does not anticipate the number of PDCCH candidates, and the number of multiple corresponding non-overlapping CCEs per time slot on the secondary cell is greater than the corresponding number that UE 116 can monitor on the secondary cell per time slot. For cross-carrier scheduling, the number of monitored PDCCH candidates and the number of non-overlapping CCEs per time slot are counted separately for each scheduled cell.

[0149] For all search space sets within time slot n, use S css Represents a set of bases I css CSS set, using S uss Represents a set of bases J uss The USS set. The USS set S j (0≤j<J uss In S uss The positions within are sorted in ascending order according to the search space set index. (0≤i<I css ) indicates that it is used to monitor CSS sets S css (i) The number of PDCCH candidates counted, and using (0≤j<J uss ) indicates that it is used to monitor the USS set S uss (j) is the number of PDCCH candidates being counted. For the CSS set, UE 116 monitoring requires a total of [number] times in one slot. Non-overlapping CCEs One PDCCH candidate.

[0150] UE 116 assigns the PDCCH candidates used for monitoring to the USS set for the primary cell with an active DL BWP having an SCS configuration μ in time slot n, according to the following pseudocode lines. This is for the search space set S. uss The non-overlapping CCE set of (j) can be represented as V CCE (S uss (j)), and for the cardinality V CCE (S uss (j) can be represented as c(V) CCE (S uss (j)), where the search space set S uss (j) Non-overlapping CCEs considering the assigned PDCCH candidates used to monitor the CSS set and the search space set S. ussThe value (k) (0≤k≤j) is determined under the condition of being assigned a PDCCH. UF 116 can be set. And set When UE 116 is determined Know At that time, UE 116 can be used for monitoring Each PDCCH candidate is assigned to the USS set S. uss (j) makes And j = j + 1.

[0151] In some embodiments, the reception reliability of UE 116 for DCI format or TB can be improved when associated PDCCH or PDSCH transmissions providing DCI format or TB occur from multiple transmission points of the serving cell. Similarly, the reception reliability of gNB 102 for UCI or TB can be improved when associated PUCCH or PUSCH providing UCI or TB is received by multiple reception points of the serving cell. This is especially true for cell-edge UE 116. DL throughput can also be increased when multiple transmission points transmit corresponding multiple TBs to UE 116. Communication between UE 116 and multiple TRPs is referred to as multi-TRP communication and can essentially provide a borderless experience for mobility-enabled UE 116 because associated TRPs can be updated without requiring a hard handover.

[0152] In several embodiments, multi-TRP communication can provide substantial benefits for applications requiring enhanced reliability, such as those associated with Ultra-Reliable Low-Latency Communication (URLLC) or those requiring enhanced mobility support, such as Vehicle-to-Everything (V2X) communication. Multi-TRP communication can provide (time / frequency / spatial) diversity for sending / receiving the same control or data information under channel or interference conditions. Multi-TRP communication is often associated with Non-Coherent Joint Transmission (NCJT) because amplitude and phase mismatches are quite difficult to avoid in practice, and the transceiver RF chains for different TRPs are typically different, thus making coherent combinations of the corresponding receptions disadvantageous. For NCJT, the scheduling and precoders used by different TRPs can be independent. When UE 116 receives from or transmits to a single transmit point, UE 116 can provide CSI feedback for each TRP.

[0153] As described herein, the configuration for communicating with multiple TRPs implies the configuration of multiple corresponding CORESETs or search space sets for PDCCH monitoring, which is used to schedule PDSCH reception or PUSCH transmission from UEs on the cell. In the following text, to simplify reception or transmission from or to a TRP, reception or transmission is scheduled using the DCI format provided by the PDCCH reception in the corresponding CORESET group. If reception or transmission is not scheduled using the DCI format, the higher layer configuring reception or transmission will also configure the association with the CORESET group.

[0154] In some embodiments, UE 116 can receive the same or different TBs from multiple TRPs. In these embodiments, UE 116 typically provides corresponding HARQ-ACK information to the TRPs. When the backhaul link between TRPs does not cause substantial delay, UE 116 can provide HARQ-ACK information in the same HARQ-ACK codeword multiplexed in the same PUCCH or PUSCH transmission. When the backhaul link between TRPs causes substantial delay, UE 116 can provide HARQ-ACK information in a separate HARQ-ACK codeword. When UE 116 receives the same TB from multiple TRPs, and when UE 116 does not provide separate HARQ-ACK information for each of the multiple TRPs, the size of the corresponding HARQ-ACK codeword can be reduced, regardless of whether the TB received from a particular TRP is correct or incorrect. When providing joint HARQ-ACK feedback to multiple TRPs within the same HARQ-ACK codeword, the UE may include a single HARQ-ACK information bit for the same TB transmitted from more than one of the multiple TRPs. If the UE correctly receives the TB from at least one TRP, the HARQ-ACK information bit has an ACK value; otherwise, it has a NACK value. Furthermore, when the UE 116 provides HARQ-ACK information within the same HARQ-ACK codeword, the UE 116 ensures that both TRPs can reliably detect the HARQ-ACK codeword in their respective PUCCH or PUSCH receptions.

[0155] When scheduling on multiple TRPs is not closely coordinated, the first TRP may schedule the PUSCH transmission from UE 116 before the second TRP schedules the PDSCH reception of UE 116, wherein UE 116 is instructed to multiplex the HARQ-ACK information received from PDSCH in a PUCCH transmission that overlaps with the PUSCH transmission.

[0156] To be configured for multi-TRP communication, such as for NCJT, UE 116 monitors PDCCH from multiple TRPs. UE 116 may be configured with one or more CORESETs (CORESET groups) associated with TRPs. For example, a TRP index may be included in a CORESET configuration for explicit association, or the association may be implicit, using CORESETs associated with different TRPs having different TCI states. For example, for a UE configured to communicate with two TRPs, the TRP / group index of the CORESET associated with the first of the two TRPs may be 0, while the TRP / group index of the CORESET associated with the second of the two TRPs may be 1. UE 116 has predetermined capabilities for monitoring multiple PDCCH candidates (attempting to decode the associated DCI format) and for performing channel estimation over a time span (e.g., multiple symbols or a time slot) for multiple non-overlapping CCEs. Therefore, several embodiments of this disclosure recognize and consider the need for partitioning UE 116 capabilities for determining PDCCH monitoring between TRPs and between cells. Several embodiments of this disclosure further recognize and consider the need to determine the allocation of the search space set for cell TRPs to PDCCH candidates and non-overlapping CCEs.

[0157] UE 116 also has a per-cell predetermined capability to monitor the corresponding PDCCH with a number of DCI format sizes having a CRC scrambled by C-RNTI. Using more than one TRP per cell can introduce additional sizes for this DCI format per cell, which can exceed the UE's capability for the number of DCI format sizes without any limitation or enhancement in the DCI format design. Therefore, various embodiments of this disclosure recognize and consider the need for DCI formats such that the total number of DCI format sizes with a CRC scrambled by C-RNTI that the UE monitors on the PDCCH for scheduling in a cell does not exceed the UE's capability for the corresponding number of sizes. Further embodiments of this disclosure recognize and consider the need for UE 116 to be able to report the number of DCI format sizes with a CRC scrambled by C-RNTI that the UE monitors on the PDCCH for scheduling in a cell.

[0158] The appropriate configuration of the TRP set or PDCCH transmission parameters of the TRP set used for communication with UE 116 can change in a timely manner due to UE mobility or due to channel or interference changes. Since UE 116 has limited capabilities for monitoring PDCCH, the TRP set used for communication with UE 116 can be adapted, or the parameters used for PDCCH monitoring of UE 116 can be adapted, while minimizing potential interruption times in communication with UE 116. Therefore, various embodiments of this disclosure recognize and consider the need to minimize latency when adapting the TRP set configured for communication with UE 116. Furthermore, various embodiments of this disclosure recognize and consider the need to adapt the parameters of the search space set or the associated CORESET used by UE 116 to monitor PDCCH from the TRP set. Therefore, various embodiments of this disclosure enable UEs such as UE 116 to monitor PDCCH for communication with multiple TRPs.

[0159] For example, several embodiments of this disclosure enable a mechanism that determines the partitioning of UE capabilities for PDCCH monitoring between TRPs of the same scheduling cell and between scheduling cells, and determines the allocation of PDCCH candidates and non-overlapping CCEs to the search space set of the scheduling cell TRP. Therefore, embodiments of this disclosure further provide DCI formats such that the total number of DCI format sizes for UEs monitoring scheduled PDCCH on a cell, with CRC scrambled by C-RNTI, does not exceed the number of UE capabilities corresponding to the size.

[0160] Embodiments of this disclosure further enable the UE to report the number of DCI format sizes of the PDCCH monitored and scheduled on the cell, with CRC scrambled by C-RNTI. Embodiments of this disclosure also minimize the latency of adapting the TRP set configured for communication with the UE, and adapt the parameters of the search space set or associated CORESET used by UE 116 to monitor the PDCCH from the TRP set.

[0161] In some embodiments, PDCCH candidates can be assigned to TRPs of the serving cell and a corresponding search space can be determined. When UE 116 is configured to communicate with multiple TRPs on a cell, the number of CORESETs or search space sets that UE 116 can be configured to have can be greater than the corresponding number of CORESETs or search space sets that UE 116 can be configured to have when UE 116 is configured to have a single TRP on a cell. For example, when UE 116 is configured to communicate with two TRPs on a cell, UE 116 can be configured to have up to two CORESETs for the first TRP and up to two CORESETs for the second TRP, in addition to the CORESET at index 0, for a total of up to five CORESETs on the cell. When UE 116 is configured to communicate with one TRP on a cell, UE 116 can be configured to have up to two additional CORESETs in addition to the CORESET at index 0.

[0162] In one embodiment, while keeping the maximum number of CORESETs for TRP P≤3, UE 116 can maintain the search space for determining TRP as shown in Equation 1. Corresponding to A p The CORESET index is only above the CORESET configured by UE 116 for the TRP, and not above all CORESETs configured by UE 116 for the cell (including CORESETs used for other TRPs). Therefore, to determine the search space for PDCCH candidates received in the CORESET with index p, A p It can be replaced with A p,t Alternatively, index p can be limited to the total number of CORESETs per TRP rather than the total number of CORESETs per cell.

[0163] In another embodiment, to avoid UEs having the same position for PDCCH candidates in a CORESET with the same index for different TRPs, and thus reducing the likelihood that the PDCCH candidate CCEs of different UEs overlapping in the CORESET of the first TRP also overlap in the CORESET of the second TRP with the same index, the TRP index n TRP This is also included in the determination of the search space. For example, for self-carrier scheduling, the search space can be determined by Equation 2, where n TRP It is a TRP index.

[0164] Equation 2

[0165]

[0166] For example, for a total of N from the scheduling cellCI For each scheduling cell, the search space can be determined by Equation 3, where n TRP It is a TRP index

[0167] Equation 3

[0168]

[0169] Or as shown in Equation 4, where N TRP This is the maximum number of TRPs.

[0170] Equation 4

[0171]

[0172] For example, Figure 6 Methods for determining CCEs for PDCCH candidates are illustrated according to several embodiments of this disclosure. Although described herein as being implemented by UE 116, Figure 6 The method 600 shown can be implemented by one or more of UEs 111-116, and the corresponding method can be implemented by... Figure 1 One or more of the gNBs 101-103 described herein may be performed. Other embodiments may be used without departing from the scope of this disclosure. In several embodiments, the UE 116 may perform method 600 to monitor downlink channels communicating with multiple TRPs.

[0173] UE, for example, UE 116, can receive PDCCH from a first TRP and / or a second TRP. In operation 610, UE 116 determines whether a CORESET with a corresponding index for receiving PDCCH candidates on the scheduled cell is associated with the first TRP or the second TRP (first CORESET group index or second CORESET group index). In response to determining that the CORESET is associated with the first TRP, UE 116 proceeds to operation 620. In response to determining that the CORESET is not associated with the first TRP, UE 116 proceeds to operation 630.

[0174] In operation 620, when CORESET is associated with a first TRP, UE 116 is configured to receive PDCCH from only a single TRP, and UE 116 determines the CCE for receiving PDCCH candidates in CORESET.

[0175] In some embodiments, UE 116 may determine that CORESET is associated with a second TRP when CORESET is not associated with a first TRP. In operation 630, when CORESET is associated with a second TRP, UE 116 determines the CCEs used to receive PDCCH candidates in CORESET by additionally applying an offset of the number of CCEs. Scheduling cells do not only perform scheduling on the scheduling cell. For example, when more than one scheduled cell comes from the scheduling cell, the offset of the number of CCEs may depend on the number of scheduled cells from the scheduling cell. In some embodiments, the offset may also depend on the TRP index, although this may be transparent to the case of two TRPs.

[0176] In embodiments using cross-carrier scheduling, UE 116 can configure a separate search space set and CORESET on the scheduling cell for receiving PDSCH from or sending PUSCH to the scheduled cell TRP. For example, UE 116 can be configured with self-carrier scheduling for a first TRP and cross-carrier scheduling for a second TRP. In some embodiments, for a UE 116 configured to receive PDSCH from a first TRP and from a second TRP on a first cell, for example, operating in a millimeter-wave (mmWave) band, UE 116 can receive a first PDCCH scheduled for receiving the first PDSCH from the first TRP on the first cell and a second PDCCH scheduled for receiving the second PDSCH from the second cell. For example, the second cell can operate at a carrier frequency lower than that of the first cell. In some embodiments, the second cell can operate at 3.5 GHz. Therefore, the first TRP can be used to schedule UE 116 while providing robustness to PDSCH reception in cases where the likelihood of link degradation on the first cell operating in the mmWave band is higher than that on the second cell operating at 3.5 GHz.

[0177] For example, Figure 7 The scheduling of first PDSCH reception and second PDSCH reception according to several embodiments of this disclosure is illustrated. Specifically, Figure 7 Examples of receiving via a first PDCCH from a first TRP on a first cell and a first PDSCH from a first TRP on a first cell are shown; and examples of receiving via a second PDCCH from a second TRP on a second cell and a second PDSCH from a second TRP on a first cell are shown.

[0178] Figure 7The diagram illustrates a first cell operating on a first frequency layer, namely cell 1 710, and a second cell operating on a second frequency layer, namely cell 2 750. On the first cell 710, UE 720 is configured to receive data from a first TRP, namely TRP1 30, and a second TRP, namely TRP2 740. UE 720 can be any of UEs 111-116. Furthermore, on the first cell 710, UE 720 receives a first PDCCH, namely PDCCH 1 770, and a first PDSCH, namely PDSCH 1 775, scheduled in DCI format by the first PDCCH 770 from the first TRP 730. UE 720 also receives a second PDSCH, namely PDSCH 2785, from the second TRP 740.

[0179] On the second cell 750, UE 720 is configured to receive from the third TRP, namely TRP 760. UE 720 receives the second PDCCH, namely PDCCH 2 780, from the third TRP 760, which provides the DCI format for scheduling the second PDSCH 785.

[0180] Embodiments of this disclosure consider multiple methods for allocating PDCCH candidates and non-overlapping CCEs between cells and TRPs. In one embodiment, the per-cell allocation of the UE 116's ability to monitor PDCCH candidates and perform channel estimation on multiple non-overlapping CCEs is the same as in the embodiment of a single TRP per cell. After determining the number of PDCCH candidates and the number of non-overlapping CCEs for a serving cell in which the UE 116 is configured to monitor PDCCH on more than one TRP, the UE 116 can determine the number of PDCCH candidates or the number of non-overlapping CCEs allocated to the search space set of TRPs used for scheduling on the serving cell. Therefore, for a DL BWP configured with SCS configuration μ UE 116 in the downlink cell, UE 116 may not be... Monitoring on one or more DL BWPs in one or more scheduling cells of a downlink cell More than one PDCCH candidate or More than one non-overlapping CCE per time slot. In several embodiments, the DL BWP can be active for an activated cell or inactive / dormant for a deactivated cell. UE 116 can monitor PDCCH candidates or non-overlapping CCEs per time slot accordingly, regardless of where UE 116 is from. downlink cells or across all The number of TRPs configured for each downlink cell, and despite the increase in the maximum number of CORESETs that can be configured for the UE on the scheduling cell, wherein the UE monitors the PDCCH on more than one TRP used for scheduling on the serving cell.

[0181] In some embodiments, in order to determine the CSS set of a TRP, UE 116 may anticipate having a sufficient number of PDCCH candidates and non-overlapping CCEs in the primary cell for all CSS sets to be assigned to all TRPs (and any discarded search space set is the USS set).

[0182] In other embodiments, to enable the determination of the CSS sets of a TRP, for example when more than one TRP of UE 116 is configured with one or more CSS sets, a gNB, such as gNB 102, can provide full flexibility in the configuration of CSS sets (e.g., in the configuration of the number of PDCCH candidates at each CCE aggregation level or the configuration of the PDCCH monitoring timing of the CSS sets). For example, the total number of PDCCH candidates for all CSS sets of all TRPs or the total number of non-overlapping CCEs per slot may exceed the maximum number per slot for the corresponding serving cell, such as the primary cell (PCell). UE 116 may first assign PDCCH candidates and non-overlapping CCEs to the CSS sets of the TRP in ascending order of the CSS set index, starting with the CSS set with the smallest index of the TRP with the smallest index, and then assign PDCCH candidates and non-overlapping CCEs to the CSS sets of the TRP in ascending order of the TRP index, or first assign PDCCH candidates and non-overlapping CCEs to the CSS sets of the TRP in ascending order of the TRP index, starting with the CSS set with the smallest index of the TRP with the smallest index, and then assign PDCCH candidates and non-overlapping CCEs to the CSS sets of the TRP in ascending order of the TRP index.

[0183] When UE 116 assigns PDCCH candidates and non-overlapping CCEs to the TRP's CSS set first in ascending order of the CSS set index and then in ascending order of the TRP index, UE 116 can determine, based on pseudocode or any other equivalent procedure used to generate the CSS set, the cell (e.g., the primary cell) has UE monitoring PDCCH activity DL BWP and SCS configuration μ in slot n, where:

[0184] T represents the number of TRPs configured in the UE on the primary cell.

[0185] The total number of CSS sets of J(t)TRP t

[0186] V CCE (S css The search space set S of (j,t)TRP t css The non-overlapping CCE set of (j, t), 0 ≤ t < T,

[0187] C(VCCE (S css (j,t))) is V CCE (S css The cardinality of (j, t) is considered, where the assigned PDCCH candidates for monitoring the CSS set and the cardinality for monitoring all search space sets S are taken into account. css (k, t), 0 ≤ k ≤ j are assigned PDCCH candidates to determine the search space set S. css Non-overlapping CCEs of (j, t).

[0188] set up

[0189] set up

[0190] Set t=0

[0191] Set j=0

[0192] t < T

[0193] While

[0194] j < J(t)

[0195] Whie

[0196] if and Used for monitoring One PDCCH candidate is assigned to CSS set S css (j, t)

[0197]

[0198]

[0199] j = j + 1:

[0200] otherwise

[0201] Interruption;

[0202] if the condition ends

[0203] The while condition ends

[0204] t = t + 1;

[0205] The while condition ends

[0206] For example, when UE 116 is configured with two TRPs, UE 116 can assume that all PDCCH candidates in all CSS sets are assigned to the first TRP on the primary cell (and any discarded search space set is the USS set of the first TRP of the primary cell). The corresponding number of PDCCH candidates is... And the corresponding number of non-overlapping CCEs is UE 116 determines the PDCCH candidate allocation for the CSS set based on the following pseudocode. If UE 116 does not monitor the PDCCH candidate for the CSS set with index j for TRP t in slot, And C(V) CCE (S css (j, t))) = 0, or equivalently, UE 116 skips the allocation of PDCCH candidate assignments and non-overlapping CCEs for the CSS set with index j for TRP t in slot .

[0207] but:

[0208] set up

[0209] set up

[0210] Set j=0

[0211] Whie j<J(t)

[0212] if and

[0213] Used for monitoring One PDCCH candidate is assigned to CSS set S css (j, t)

[0214]

[0215]

[0216] j = j + 1:

[0217] otherwise

[0218] Interruption;

[0219] if the condition ends

[0220] The while condition ends

[0221] As described in this paper, instead of alternating between TRPs of CSS sets before potentially continuing to the next CSS set, maximizing CSS set allocation and minimizing the likelihood that UE 116 will need to discard CSS sets. For example, UE 116 may not expect to discard any CSS sets for the first TRP.

[0222] For example, Figure 8A method for determining a set of CSS (CSS) to monitor two TRPs of a cell, according to several embodiments of this disclosure, is illustrated. Although described herein as being implemented by UE 116, Figure 8 The method 800 shown can be implemented by one or more of UEs 111-116, and the corresponding method can be implemented by... Figure 1 One or more of the gNBs 101-103 described herein may be performed. Other embodiments may be used without departing from the scope of this disclosure. In several embodiments, the UE 116 may perform method 800 to monitor downlink channels communicating with multiple TRPs.

[0223] In operation 810, the UE, such as UE 116, determines the number of PDCCH candidates and / or the number of non-overlapping CCEs for PDCCH reception in a time slot associated with scheduling on the cell. In some embodiments, the determination by UE 116 further includes providing PDCCH reception in DCI format without scheduling PDSCH reception or PUSCH transmission.

[0224] In operation 820, UE 116 will PDCCH candidates and A non-overlapping CCE is assigned to the CSS set of the first TRP. In operation 830, UE 116 sets j=0.

[0225] In operation 840, UE 116 determines the number of available PDCCH candidates and the number of available non-overlapping CCEs. UE 116 determines the available PDCCH candidates and available non-overlapping CCEs as follows:

[0226] and

[0227]

[0228] In operation 850, UE 116 determines the number of PDCCH candidates for the CSS set with index j of the second TRP. Is it less than or equal to? And the number of non-overlapping CCEs C(V) CCE (S css Is (j, t) less than or equal to? In response to UE 116, the number of PDCCH candidates is determined. Less than or equal to And the number of non-overlapping CCEs C(V) CCE (S css (j,t)) is less than or equal to UE 116 proceeds to operation 860. This is in response to determining the number of PDCCH candidates. Not less than or equal to Or the number of non-overlapping CCEs, C(V) CCE (S css (j, t)) is not less than or equal to UE 116 proceeds to operation 870. In operation 870, method 800 terminates. More specifically, UE 116 determines that for the second TRP, it does not monitor PDCCH in any search space set with an index equal to or greater than j.

[0229] In operation 860, the number of PDCCH candidates is determined based on UE 116. Less than or equal to And the number of non-overlapping CCEs C(V) CCE (S css (j,t)) is less than or equal to UE 116 assigns the PDCCH candidate to the CSS set with index j for the second TRP, setting... And j = j + 1.

[0230] In operation 860, UE 116 assigns the PDCCH candidate to the CSS set with index j for the second TRP and sets... After j = j + 1, UE 116 returns to operation 840 and determines the available PDCCH candidates and available non-overlapping CCEs as follows: and

[0231] Although described herein as a series of steps, the steps of method 800 may occur simultaneously or in a different order. For example, UE 116 may perform the steps in operation 820. PDCCH candidates and Before or simultaneously with assigning a non-overlapping CCE to the CSS set of the first TRP, set j=0 in operation 830.

[0232] In operation 820, UE 116 will PDCCH candidates and A non-overlapping CCE is assigned to the CSS set of the first TRP. In operation 830, UE 116 sets j=0.

[0233] Since UE 116 assigns PDCCH candidates and non-overlapping CCEs to the CSS sets of a TRP first in ascending order of the TRP index and then in ascending order of the CSS set index, corresponding pseudocode is generated for the timing of assigning PDCCH candidates and non-overlapping CCEs first in ascending order of the CSS set index and then in ascending order of the TRP index. An exception might be that the "while" loop order of the CSS set index is reversed compared to the TRP index. Whether the assignment of PDCCH candidates and non-overlapping CCEs is first in ascending order of the CSS set index (starting from the CSS set with the smallest index of the TRP) and then in ascending order of the TRP index, or first in ascending order of the TRP index (starting from the CSS set with the smallest index of the TRP) and then in ascending order of the CSS set index, can be configured to UE 116 by a gNB, such as gNB 102, via higher-layer signaling.

[0234] For the USS set on the primary cell, there may be multiple allocation implementations. For example, allocation can be performed first across TRP indices and then across USS set indices (e.g., starting with the USS set with the smallest index of the TRP with the smallest index), or it can be performed first across USS set indices and then across TRP indices (starting with the USS set with the smallest index of the TRP with the smallest index). In various implementations, the priority order can be specified in system operation or can be configured to UE 116 by gNB 102 via higher-layer signaling. As described herein, the corresponding pseudocode can be as previously described, except that for the serving cell in which UE 116 monitors the PDCCH in the CSS set, It can be replaced with and It can be replaced with in and These are the number of PDCCH candidates and the number of non-overlapping CCEs in the CSS set assigned to the TRP on the serving cell, respectively, for PDCCH monitoring.

[0235] In some embodiments, besides the primary cell, UE 116 may not have available PDCCH candidates or non-overlapping CCEs to assign to all USS sets on a secondary cell where UE 116 is configured to communicate with multiple TRPs. In these embodiments, UE 116 may apply the same procedure as for the primary cell to assign available PDCCH candidates or non-overlapping CCEs to USS sets in the secondary cell.

[0236] As described herein, various embodiments of this disclosure contemplate multiple methods for allocating PDCCH candidates and non-overlapping CCEs among cells and TRPs. In one embodiment, the per-cell allocation of the UE's ability to monitor PDCCH candidates and perform channel estimation on multiple non-overlapping CCEs is the same as in the embodiment of a single TRP per cell. In another embodiment, each TRP is treated as a cell for the purpose of allocating the number of PDCCH candidates the UE can monitor and perform channel estimation on multiple non-overlapping CCEs. When the UE can support communication with multiple TRPs on the serving cell, for example as part of a UE capability report, the UE... The ability to monitor PDCCH on a certain number of cells becomes equivalent to that of the UE in The ability to monitor PDCCH on the number of TRPs. For a total of active DL BWPs configured with SCS configuration μ. A TRP UE, the UE in The scheduling TRP in a TRP may not monitor more than [number] DL BWPs. There are more or more PDCCH candidates Non-overlapping CCEs for each time slot, where This refers to the number of active DL BWP cells with SCS configuration j that the UE monitors from a single TRP's PDCCH (all CORESETs have the same index), and This refers to the number of active DL BWP cells with SCS configuration j that the UE monitors from two TRP PDCCHs (CORESETs with different indices). In various embodiments, the DL BWP can be active for activated cells, or inactive / dormant for deactivated cells.

[0237] In several embodiments, UE 116 can report the number of cells. The primary capability for PDCCH monitoring, which applies when the UE 116 is not configured for multi-TRP communication on any cell, and reports on the number of TRPs. The second capability of PDCCH monitoring applies when UE 116 is configured for multi-TRP communication on at least one cell. Equivalently, regardless of whether UE 116 is configured to communicate with one TRP on each configured cell or with more than one TRP in some configured cells, the capability is adjusted for the number of cells. The same UE capability for PDCCH monitoring is applicable, and UE 116 can report an additional capability for PDCCH monitoring on cells configured with multiple TRPs, wherein, according to the first two embodiments, the two TRPs are considered as a single cell (the UE capability for PDCCH monitoring in each cell does not increase - lower limit) or two separate cells (the UE capability for PDCCH monitoring in each cell is doubled - upper limit). For example, a UE that does not support multi-TRP operation can indicate... UEs that support multiple TRP operations can instruct Or you can indicate Furthermore, it can indicate individual capabilities by doubling the PDCCH monitoring capability for each cell. Additionally, even when the UE is not configured for multi-TRP operations, a UE supporting multi-TRP operations can still utilize the increased PDCCH monitoring capability for each cell. In the above example, when the UE is not configured to perform multi-TRP operations in any cell, the UE can support...

[0238] For example, with a maximum of two TRPs per cell, when UE 116 is configured with one TRP per cell... When there are multiple cells, UE 116 is configured with μ for SCS to support each cell per time slot. and When each cell has one TRP When there are multiple cells, UE 116 is configured with μ for SCS to support each cell per time slot. and When UE 116 is configured with When there are TRPs, among which This refers to the number of TRPs in cell c with SCS configuration μ. UE 116 supports per TRP per time slot for SCS configuration μ. and When UE 116 is configured with When there is one TRP, UE 116 is configured with μ for SCS to support per TRP per time slot. Know

[0239] In various embodiments, when UE 116 is configured to communicate with a single TRP on the cell, UE 116 supports SCS configuration μ for a first maximum number of PDCCH candidates. And the first maximum non-overlapping CCE for each time slot or each PDCCH monitoring span PDCCH monitoring. When UE 116 is configured to communicate with more than one TRP, the UE further supports SCS configuration μ for a second maximum number of PDCCH candidates. and the second largest non-overlapping CCE for each time slot or each PDCCH monitoring span PDCCH monitoring.

[0240] When a UE is configured to communicate with multiple TRPs in at least one cell, the same procedure for allocating PDCCH candidates and non-overlapping CCEs to the CSS set and USS set by the UE can be applied as when the UE is configured to communicate with a single TRP in all cells. For example, for any TRP of the primary cell or the first TRP of the primary cell, the following procedure can be applied:

[0241] Start Program

[0242] For all search space sets within time slot n, use S css Represents a set of bases I css The CSS set, and using S uss Represents a set of bases J uss USS set. USS set s j (0≤j<J uss In S uss The positions within are sorted in ascending order according to the search space set index. (0≤i<I Css ) indicates the set S used for monitoring CSs. css (i) The number of PDCCH candidates already counted, and using (0≤j<J uss ) indicates that it is used to monitor the USS set S uss (j) is the number of counted PDCCH candidates.

[0243] For CSS sets, UE monitoring needs to be performed in total timeslots. Non-overlapping CCEs One PDCCH candidate.

[0244] The UE assigns PDCCH candidates for monitoring to the USS set according to the following pseudocode. The USS set is used for the first TRP of the primary cell with an active DL BWP in time slot n with SCS configuration μ.

[0245] Use V CCE (S uss (j) represents the search space set S. uss (j) is a non-overlapping CCE set, and C(V) is used to define it. CCE (S uss (j))) represents the cardinality V CCE (S uss (j)), where the search space set S uss(j) Non-overlapping CCEs considering the assigned PDCCH candidates used to monitor the CSS set and the search space set S. uss The PDCCH candidate is determined when (k)(0≤k≤j) is assigned.

[0246] set up

[0247] set up

[0248] Set j=0

[0249] while and

[0250] Used for monitoring Each PDCCH candidate is assigned to the USS set S. uss (j)

[0251]

[0252]

[0253] j = j + 1;

[0254] The while condition ends

[0255] Program ended

[0256] Several embodiments of this disclosure enable the UE to maintain a limited number of DCI format sizes detected for each cell when the UE is configured to communicate with more than one TRP on a cell. For example, when the UE is configured to communicate with multiple TRPs on a serving cell, up to four DCI format sizes can be maintained for each serving cell of the UE, including up to three DCI format sizes with CRCs scrambled by C-RNTI. To maintain four DCI format sizes, the sizes of the DCI formats detected by the UE in PDCCH reception from multiple TRPs satisfy a set of constraints.

[0257] When a UE is configured to communicate with multiple TRPs on a cell, scheduling, for example, provides the UE's DCI format for PDSCH reception with parameters associated with one PDSCH reception from one TRP, or parameters associated with more than one PDSCH reception from more than one TRP. When the DCI format schedules PDSCH reception from one TRP, the UE can be configured with a DCI format of the same size for PDCCH monitoring on each TRP that schedules PDSCH reception on the active DL BWP of the cell. When the DCI format schedules PDSCH reception from more than one TRP, the DCI format does not have the same size as the DCI format for scheduling PDSCH reception from a single TRP on the active DL BWP of the cell, because scheduling information is provided for more than one PDSCH. For example, when the UE is not configured to communicate with multiple TRPs, the UE can be configured to monitor search space sets for DCI format 1_0 for scheduled PDSCH reception and DCI format 0_0 for scheduled PUSCH transmission, and search space sets for monitoring DCI format 1_1 and DCI format 0_1 ​​for scheduled PUSCH transmission, for scheduling PDSCH reception on the cell's active DL BWP. The DCI format for scheduling PDSCH reception from multiple TRPs to the UE is referred to as DCI format 1_2, and its size is larger than other DCI formats that the UE monitors for associated PDCCH for PDSCH reception or PUSCH transmission. Therefore, several embodiments of this disclosure recognize and consider the advantage of avoiding increasing the number of DCI formats with CRC scrambled by C-RNTI.

[0258] In one embodiment, a separate search space configuration for DCI format 1_2 is provided to the UE, such as UE 116. DCI format 1_2 is larger in size than other DCI formats, thus using a different PDCCH candidate distribution for each CCE aggregation level. Furthermore, the network can choose to have the UE schedule multiple PDSCH receptions from multiple corresponding TRPs using DCI format 1_2 in a certain period, which differs from the period when the UE schedules a single PDSCH from a single corresponding TRP using DCI format 0_1 ​​or DCI format 1_1, using different periods for PDCCH monitoring within the corresponding search space set. To avoid increasing the size of the corresponding PDCCH candidate DCI format with C-RNTI scrambling CRC used by the UE to monitor each time slot of the cell, the UE can apply zero-padding to DCI format 1_1 when its size is smaller than DCI format 0_1, or apply zero-padding to DCI format 0_1 ​​when its size is smaller than DCI format 1_1, so that DCI format 0_1 ​​and DCI format 1_1 have the same size. Alternatively, when the size of DCI format 1_1 is larger than that of DCI format 0_1, the UE may not monitor the PDCCH for DCI format 1_1 and may not use padding for DCI format 0_1.

[0259] In another embodiment, the UE, such as UE 116, monitors the PDCCH for DCI format 1_2 within the same search space set as DCI format 0_1. When the UE monitors DCI format 1_2, it may not monitor DCI format 1_1. Similarly, when the UE monitors DCI format 1_1, it may not monitor DCI format 1_2. For example, the search space set configuration may include an indication or flag indicating whether the UE monitors the PDCCH for DCI format 1_1 or DCI format 1_2, or that when the UE is configured to monitor DCI format 1_2, the UE always monitors DCI format 1_2 and does not monitor DCI format 1_1. This indication may be included to avoid increasing the number of search space sets used for PDCCH monitoring by the UE, especially when the size difference between DCI format 1_2 and DCI format 0_1 ​​is not so large that a different PDCCH candidate distribution is required for each CCE aggregation level.

[0260] For example, Figure 9 Methods for monitoring PDCCH in DCI format according to several embodiments of this disclosure are shown. More specifically, Figure 9 Methods for monitoring PDCCH according to various embodiments of this disclosure for scheduling multiple PDSCH receptions from corresponding multiple TRPs in DCI format are illustrated. Although described herein as being implemented by UE 116, Figure 9The method 900 shown can be implemented by one or more of UEs 111-116, and the corresponding method can be implemented by... Figure 1 One or more of the gNBs 101-103 described herein may be performed. Other embodiments may be used without departing from the scope of this disclosure. In several embodiments, the UE 116 may perform method 900 to monitor downlink channels communicating with multiple TRPs.

[0261] In operation 910, the UE, such as UE 116, is provided with separate configurations for the following search space sets: a first search space set for monitoring PDCCH for DCI format 1_0 and DCI format 0_0, a second search space set for monitoring PDCCH for DCI format 1_1 and DCI format 0_1, and a third search space set for monitoring PDCCH for DCI format 1_2. In several embodiments, DCI format 1_0 or DCI format 1_1 schedules PDCCH reception from a single TRP, while DCI format 1_2 schedules PDCCH reception from multiple TRPs.

[0262] In operation 920, UE 116 determines whether the size of DCI format 1_1 is the same as the size of DCI format 0_1. If the sizes of DCI format 1_1 and DCI format 0_1 ​​are the same, UE 116 proceeds to operation 930. In operation 930, UE 116 monitors the PDCCH for DCI format 1_1 and DCI format 0_1 ​​in the second search space set. If UE 116 determines in operation 920 that the sizes of DCI format 1_1 and DCI format 0_1 ​​are different, UE 116 proceeds to operation 940.

[0263] In operation 940, UE 116 determines whether the size of DCI format 1_1 is the same as the size of DCI format 0_1. If UE 116 determines that the size of DCI format 1_1 is smaller than the size of DCI format 0_1, then UE 116 proceeds to operation 950. In operation 950, UE 116 applies zero-padding to DCI format 1_1 until the size of DCI format 1_1 is the same as that of DCI format 0_1, and monitors the PDCCH for DCI format 1_1 and DCI format 0_1 ​​in a second search space set.

[0264] If UE 116 determines in operation 940 that the size of DCI format 1_1 is not less than the size of DCI format 0_1, then UE 116 proceeds to operation 960. In operation 960, UE 116 applies zero-padding to DCI format 0_1 ​​until the size of DCI format 0_1 ​​is the same as that of DCI format 1_1, and monitors the PDCCH for DCI format 1_1 and DCI format 0_1 ​​in the second search space set.

[0265] In several embodiments, padding of the DCI format unnecessarily increases the size of the DCI format, inevitably leading to lower reception reliability or higher resource overhead for a given reception reliability. The UE 116, capable of communicating with multiple TRPs, is also able to monitor the PDCCH for multiple DCI format sizes with a C-RNTI-scrambled CRC and a size larger than a minimum predetermined size. The UE 116 can report to the serving gNB its ability to monitor the PDCCH of each cell and the number of DCI format sizes with a C-RNTI-scrambled CRC. Based on the reported UE capability, the gNB 102 can determine not to apply zero-padding to one or more DCI formats with a C-RNTI-scrambled CRC, so as to operate with a number of sizes equal to the predetermined minimum number for the UE 116.

[0266] Several embodiments of this disclosure recognize and contemplate that a set of TRPs or a set of transmission parameters associated with a TRP assigned to a UE, such as UE 116, for communication can be adapted based on indications in the DCI format. For example, UE 116 may monitor PDCCHs in a CSS set or a USS set. For example, a CSS set or USS set may be associated with CORESET 0. The PDCCH may convey a DCI format that provides indications of parameters associated with PDCCH reception in a CORESET corresponding to a TRP set. For example, UE 116 may be configured with fields in the DCI format to indicate such parameters for each cell or for each group of cells in which the UE is configured with multiple TRPs. The parameters may include indications of whether UE 116 is expected to monitor PDCCH reception from a particular TRP in the TRP set. The DCI format may provide additional functionality, such as indicating whether UE 116 is expected to monitor PDCCHs in the search space set in the next DRX cycle. UE 116 may monitor PDCCHs for the DCI format outside of active time or during active time of the DRX cycle.

[0267] In some embodiments, UE 116 monitors PDCCH candidates for a DCI format that provides adaptation to parameters received by PDCCH in a CORESET associated with a set of TRPs in one or more CSS sets, or in one or more USS sets associated with one or more TRPs in that TRP set. UE 116 can monitor PDCCH for a DCI format in a CSS set in various ways. For example, UE 116 can monitor PDCCH for the DCI format in a CSS set with the smallest index of the TRP in that TRP set (the first TRP). As another example, UE 116 can monitor PDCCH for the DCI format in a separately configured CSS set of the TRP with the smallest index in that TRP set. As yet another example, UE 116 can monitor PDCCH for the DCI format in a configured or predetermined number of CSS sets of a corresponding number of TRPs (such as TRPs with smaller indices) in that TRP set.

[0268] The adapted DCI format for providing PDCCH transmission parameters for a TRP set can include various information. For example, for a subset of TRPs in the TRP set for each cell, or for each group of cells where the UE is configured to monitor PDCCH from multiple TRPs, the DCI format can include a bitmap that activates or deactivates all PDCCH reception, PDCCH reception of some or all CSS sets, or PDCCH reception of some or all USS sets. In some embodiments, instead of including a bitmap, fields in the DCI format can indicate a subset of TRPs from the TRP set. For example, a 2-bit field can indicate all TRPs in the TRP set, no subset in a predetermined TRPTRP set, a first configuration subset of TRPs corresponding to a cell, or a second configuration subset of TRPs. In some embodiments, the TRP subset can be the same as the TRP set. In other embodiments, the TRP subset can include a configured or predetermined TRP index, which can include all TRPs in the TRP set, except for the TRP with the smallest index (the first TRP), which is considered always active by the UE 116 unless deactivated by higher-layer signaling. In some other embodiments, the TRP subset may include all TRP indexes other than the TRP index for which UE 116 is configured to monitor PDCCH in DCI format.

[0269] In some embodiments, the DCI format may include the TCI status of one or more CORESETs of one or more TRPs. For example, this information may update the TCI status of a configured or pre-defined CORESET, or the TCI status of a CORESET associated with a pre-defined or configured search space set. For example, the DCI format may be provided by a PDCCH received in CORESET 0, and the TCI status of CORESET 0 may not be updated. The DCI format may update the TCI status of CORESETs of multiple scheduling units. The association between the fields providing the TCI status in the DCI format and the CORESET index may be provided to the UE 116 by a higher layer for each corresponding index of the scheduling cell.

[0270] In some embodiments, the DCI format may include CCE-to-REG mapping parameters or precoder granularity for one or more CORESETs of one or more TRPs. In other embodiments, the mapping between CCE-to-REG mapping parameters and TCI states or between precoder granularity and TCI states may be pre-configured.

[0271] In some embodiments, the DCI format may include adaptation to a CSS set or a USS set, such as activation or deactivation of a configured CSS set or USS set, or indication of the configuration of a pre-configured configuration set, CSS set, or USS set, such as the configuration of multiple PDCCH candidates for each CCE aggregation level, the PDCCH monitoring cycle, etc.

[0272] By enabling or disabling TRP adaptation, or adapting the parameters of the TRP's CORESET or the TRP's search space set, the network can quickly adapt transmissions directed to the UE based on changing channel characteristics. Channel characteristics can change due to UE mobility or interference, causing the preferred TRP set of the TRP set or the preferred TCI state set of the corresponding CORESET set of the TRP set to change over time. When UE 116 fails to detect a DCI format, UE 116 can skip PDCCH monitoring until the next DCI format PDCCH monitoring opportunity, or monitor PDCCH only for TRPs that cannot be deactivated, or monitor PDCCH for TRPs that were previously monitored before the DCI format PDCCH monitoring opportunity.

[0273] For example, Figure 10 A method for determining the TCI state for a TRP set CORESET is illustrated according to several embodiments of this disclosure. More specifically, Figure 10 Methods for determining the TCI state of a CORESET of a TRP set based on indications from a DCI format, according to several embodiments of this disclosure, are illustrated. Although described herein as being implemented by UE 116, Figure 10The method 1000 shown can be implemented by one or more of UEs 111-116, and the corresponding method can be implemented by... Figure 1 One or more of the gNBs 101-103 described herein may be performed. Other embodiments may be used without departing from the scope of this disclosure. In several embodiments, the UE 116 may perform method 1000 to monitor downlink channels communicating with multiple TRPs.

[0274] In operation 1010, the UE, such as UE 116, is configured with a TRP set for PDCCH monitoring. In some embodiments, the configuration of the TRP set may include a TRP index set and a configuration of the search space set and the associated CORESET of the TRP indexes.

[0275] In operation 1020, UE 116 is configured with a search space set for monitoring PDCCH candidates against a DCI format indicating the TCI state of a CORESET within a TRP set. In various embodiments, the DCI format may be other parameters adapted to the CORESET, such as the number of resource blocks for one or more CORESETs, CCE-to-REG mapping parameters, or precoder granularity. In some embodiments, these other parameters may have a configuration mapping to the TCI state.

[0276] In operation 1030, after UE 116 detects the DCI format, UE 116 can monitor the PDCCH in the CORESET according to the indicated TCI state. In some embodiments, a time interval can also be defined from the end of the CORESET where UE 116 receives the PDCCH with the DCI format to the time when UE 116 applies the indicated TCI state to the CORESET (when it is different from the TCI state of the CORESET before the DCI format detection).

[0277] In some embodiments, instead of an indication provided by the DCI format for activating / deactivating PDCCH monitoring in one or more TRPs, this indication may be provided by a MAC control element (MAC CE). This may also be the case for other parameters associated with PDCCH monitoring, such as the TCI status corresponding to the CORESET.

[0278] In some embodiments, UE 116 may determine the number of PDCCH candidates or non-overlapping CCEs allocated to each cell per time slot in the search space set based on TRPs from the set of TRPs that instruct UE 116 to monitor PDCCH. For example, UE 116 may allocate PDCCH candidates or non-overlapping CCEs in TRPs of cells in which the DCI format or MAC CE instructs UE 116 not to monitor PDCCH. Then, the allocation of PDCCH candidates or non-overlapping CCEs is determined based on the activated cells or TRPs, not on the configured cells or TRPs. As another example, in determining... Or determine The TRP of cells where the DCI format or MAC CE indicates that UE 116 does not monitor the PDCCH is not considered. For example, and in and These are the number of cells that the UE monitors for PDCCH in the CORESET with TRP index 0 and the CORESET with TRP index 1, respectively.

[0279] Figure 11 A base station according to an embodiment of the present disclosure is shown schematically.

[0280] Reference Figure 11 Base station 1100 may include processor 1110, transceiver 1120, and memory 1130. However, not all of the components shown in the figures are necessary. Base station 1100 may be composed of... Figure 1 The components shown may be implemented with more or fewer components. Furthermore, according to another embodiment, the processor 1110, transceiver 1120, and memory 1130 may be implemented as a single chip.

[0281] The above components will now be described in detail.

[0282] Processor 1110 may include one or more processors or other processing devices that control the proposed functions, processes, and / or methods. Operation of base station 1100 may be implemented by processor 1110.

[0283] Transceiver 1120 may include an RF transmitter for up-converting and amplifying the transmitted signal, and an RF receiver for down-converting the frequency of the received signal. However, according to another embodiment, transceiver 1120 may be implemented with more or fewer components than those shown in the components.

[0284] Transceiver 1120 can be connected to processor 1110 and send and / or receive signals. Signals may include control information and data. Furthermore, transceiver 1120 can receive signals via a wireless channel and output signals to processor 1110. Transceiver 1120 can also transmit signals output from processor 1110 via a wireless channel.

[0285] Memory 1130 may store control information or data included in signals acquired by base station 1100. Memory 1130 may be connected to processor 1110 and store at least one instruction, protocol, or parameter for the proposed function, process, and / or method. Memory 1130 may include read-only memory (ROM) and / or random access memory (RAM) and / or hard disk and / or CD-ROM and / or DVD and / or other storage devices.

[0286] Figure 12 A user equipment (UE) according to an embodiment of this disclosure is shown.

[0287] Reference Figure 12 UE 1200 may include a processor 1210, a transceiver 1220, and a memory 1230. However, not all of the components shown in the figures are required. UE 1200 may be composed of components such as processor 1210, transceiver 1220, and memory 1230. Figure 12 The components shown may be implemented with more or fewer components. Furthermore, according to another embodiment, the processor 1210, transceiver 1220, and memory 1230 may be implemented as a single chip.

[0288] The above components will now be described in detail.

[0289] Processor 1210 may include one or more processors or other processing devices that control the proposed functions, processes and / or methods. Operation of UE 1200 may be implemented by processor 1210.

[0290] Transceiver 1220 may include an RF transmitter for up-converting and amplifying the transmitted signal, and an RF receiver for down-converting the frequency of the received signal. However, according to another embodiment, transceiver 1220 may be implemented with more or fewer components than those shown in the components.

[0291] Transceiver 1220 can be connected to processor 1210 and send and / or receive signals. Signals may include control information and data. Furthermore, transceiver 1220 can receive signals via a wireless channel and output signals to processor 1210. Transceiver 1220 can also transmit signals output from processor 1210 via a wireless channel.

[0292] Memory 1230 may store control information or data included in signals obtained by UE 1200. Memory 1230 may be connected to processor 1210 and store at least one instruction, protocol, or parameter for the proposed function, process, and / or method. Memory 1230 may include read-only memory (ROM) and / or random access memory (RAM) and / or hard disk and / or CD-ROM and / or DVD and / or other storage devices.

[0293] Although this disclosure has been described using exemplary embodiments, various changes and modifications can be made by those skilled in the art. This disclosure is intended to include changes and modifications that fall within the scope of the appended claims. Nothing described herein should be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims.

Claims

1. A method performed by a user equipment (UE) to receive a physical downlink control channel (PDCCH), the method comprising: Send to base station BS a capability value for PDCCH monitoring on one or more cells, wherein the capability value indicates one of the following: each transmit / receive point (TRP) is equivalent to one of two cells, or two TRPs are equivalent to one cell; In N cells DL,μ When a cell is configured at the UE for subcarrier spacing (SCS) configuration μ, the total number M of PDCCH candidates for each time slot is determined based on the capability value, the number of the first cell, and the number of the second cell. PDCCH total,slot,μ , where N cells DL,μ It is the sum of the number of the first cell and the number of the second cell, wherein in the first cell, the same index is configured for all control resource sets (CORESET), and in the second cell, different indexes are configured for CORESET; and Monitoring N cells DL , μ M for each cell and each time slot in the cell PDCCH cell , slot , μ There are 10 PDCCH candidates, of which M PDCCH cell , slot , μ No greater than the total number M of PDCCH candidates per time slot PDCCH total , slot , μ And the maximum number M of PDCCH candidates per time slot PDCCH max , slot , μ The number of configurations.

2. The method according to claim 1, The total number of PDCCH candidates for two TRPs on a cell is equal to or greater than the total number of PDCCH candidates for one TRP on a cell.

3. The method according to claim 1, further comprising: N is determined based on integer values. cells DL , μ The total number of non-overlapping control channel elements (CCEs) for each time slot on the active downlink bandwidth portion of the DLBWP in at least one of the cells, and the integer value is 1 or 2.

4. A user equipment (UE) that receives a physical downlink control channel (PDCCH), the UE comprising: transceiver; and At least one processor, coupled to the transceiver and configured to: Send a capability value to the base station BS for PDCCH monitoring on one or more cells, wherein the capability value indicates one of the following: each transmit / receive point (TRP) is equivalent to one of two cells, or two TRPs are equivalent to one cell; In N cells DL,μ When a cell is configured at the UE for subcarrier spacing (SCS) configuration μ, the total number M of PDCCH candidates for each time slot is determined based on the capability value, the number of the first cell, and the number of the second cell. PDCCH total , slot , μ , where N cells DL , μ It is the sum of the number of the first cell and the number of the second cell, wherein in the first cell, the same index is configured for all control resource sets (CORESET), and in the second cell, different indexes are configured for CORESET; and Monitoring N cells DL,μ M for each cell and each time slot in the cell PDCCH cell,slot,μ There are 10 PDCCH candidates, of which M PDCCH cell,slot,μ No greater than the total number M of PDCCH candidates per time slot PDCCH total,slot,μ And the maximum number M of PDCCH candidates per time slot PDCCH max , slot , μ The number of configurations.

5. The UE according to claim 4, The total number of PDCCH candidates used for two TRPs on a cell is equal to or greater than the total number of PDCCH candidates used for one TRP on a cell.

6. The UE according to claim 4, wherein the at least one processor is further configured to: N is determined based on integer values. cells DL,μ The total number of non-overlapping control channel elements (CCEs) for each time slot on the active downlink bandwidth portion of the DLBWP in at least one of the cells, and the integer value is 1 or 2.

7. A base station (BS), comprising: transceiver; and At least one processor, coupled to the transceiver and configured to: The user equipment (UE) receives capability values ​​for monitoring the physical downlink control channel (PDCCH) on one or more cells, wherein the capability values ​​indicate one of the following: each transmit / receive point (TRP) is equivalent to one of two cells, or two TRPs are equivalent to one cell; In N cells DL,μ When a cell is configured at the UE for subcarrier spacing (SCS) configuration μ, the total number M of PDCCH candidates for each time slot is determined based on the capability value, the number of the first cell, and the number of the second cell. PDCCH total , slot , μ , where N cells DL , μ It is the sum of the number of the first cell and the number of the second cell, wherein in the first cell, the same index is configured for all control resource sets (CORESET), and in the second cell, different indexes are configured for CORESET; and Based on N cells DL,μ M for each cell and each time slot in the cell PDCCH cell,slot,μ Each PDCCH candidate sends a PDCCH to the UE, where M PDCCH cell , slot , μ No greater than the total number M of PDCCH candidates per time slot PDCCH total , slot , μ And the maximum number M of PDCCH candidates per time slot PDCCH max , slot , μ The number of configurations.

8. The BS according to claim 7, The total number of PDCCH candidates for two TRPs on a cell is equal to or greater than the total number of PDCCH candidates for one TRP on a cell.

9. The BS according to claim 7, wherein the at least one processor is further configured to: N is determined based on integer values. cells DL,μ The total number of non-overlapping control channel elements (CCEs) for each time slot on the active downlink bandwidth portion of the DLBWP in at least one of the cells, and the integer value is 1 or 2.

10. A method performed by a base station (BS) to transmit a physical downlink control channel (PDCCH), the method comprising: Receive capability values ​​from the user equipment (UE) regarding PDCCH monitoring on one or more cells, wherein the capability values ​​indicate one of the following: each transmit / receive point (TRP) is equivalent to one of two cells, or two TRPs are equivalent to one cell; In N cells DL,μ When a cell is configured at the UE for subcarrier spacing (SCS) configuration μ, the total number M of PDCCH candidates for each time slot is determined based on the capability value, the number of the first cell, and the number of the second cell. PDCCH total , slot , μ , where N cells DL , μ It is the sum of the number of the first cell and the number of the second cell, wherein in the first cell, the same index is configured for all control resource sets (CORESET), and in the second cell, different indexes are configured for CORESET; and Based on N cells DL,μ M for each cell and each time slot in the cell PDCCH cell,slot,μ Each PDCCH candidate sends a PDCCH to the UE, where M PDCCH cell,slot,μ No greater than the total number M of PDCCH candidates per time slot PDCCH total,slot,μ And the maximum number M of PDCCH candidates per time slot PDCCH max , slot , μ The number of configurations.

11. The method according to claim 10, The total number of PDCCH candidates for two TRPs on a cell is equal to or greater than the total number of PDCCH candidates for one TRP on a cell.

12. The method of claim 10, further comprising: N is determined based on integer values. cells DL,μ The total number of non-overlapping control channel elements (CCEs) for each time slot on the active downlink bandwidth portion of the DLBWP in at least one of the cells, and the integer value is 1 or 2.

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