Multi-cell scheduling with reduced control overhead

Abstract

This disclosure relates to quasi-fifth-generation (5G) or 5G communication systems that will be provided to support higher data rates than fourth-generation (4G) communication systems such as Long Term Evolution (LTE). A method for receiving a Physical Downlink Control Channel (PDCCH) includes: receiving information from a first group of N1 cells and a second group of N2 cells; determining the total number of PDCCHs received in a time slot on a scheduling cell based on the ratio of N1 and N2 to M; and receiving a plurality of PDCCHs in a time slot on the scheduling cell that is not greater than the total number.

Description

Technical Field

[0001] This disclosure generally relates to wireless communication systems, and more specifically, to multi-cell scheduling with reduced control overhead. Background Technology

[0002] To meet the increased 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 near-5G communication systems. Therefore, 5G or near-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems".

[0003] 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (e.g., the 60 GHz band) to achieve higher data rates. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies are discussed in 5G communication systems.

[0004] In addition, in 5G communication systems, development is underway to improve the system network based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), and receiver interference cancellation.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM), as well as filter bank multicarrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies.

[0006] Fifth-generation (5G), or new radio (NR) mobile communication, is gaining increasing momentum at all global technology events recently, driven by a variety of candidate technologies from industry and academia. Candidate technologies supporting 5G / NR mobile communication include massive MIMO (Massively Multi-Tone) technology; bands from traditional cellular frequencies to higher frequencies to provide beamforming gain and support increased capacity; new waveforms (e.g., new radio access technologies (RAT)) to flexibly adapt to various services / applications with different needs; and new multiple access schemes to support massive connectivity, among others.

[0007] Public content

[0008] Technical issues

[0009] This disclosure relates to multi-cell scheduling with reduced control overhead.

[0010] Solution to the problem

[0011] In one embodiment, a method for receiving a Physical Downlink Control Channel (PDCCH) is provided. The method includes receiving information from a first group of N1 cells and a second group of N2 cells, determining the total number of PDCCHs received in a time slot on a scheduled cell based on the ratio of N1 and N2 to M, and receiving multiple PDCCHs in a time slot on the scheduled cell that are no more than the total number. The PDCCHs provide a Downlink Control Information (DCI) format. The DCI format schedules one of the following: Physical Downlink Shared Channel (PDSCH) reception or Physical Uplink Shared Channel (PUSCH) transmission on one cell in the first group of N1 cells, or PDSCH reception or PUSCH transmission on multiple cells in up to M cells in the second group of N2 cells. M is greater than 1.

[0012] In another embodiment, a user equipment (UE) is provided. The UE includes a transceiver configured to receive information from a first group of N1 cells and a second group of N2 cells. The PDCCH provides a DCI format. The DCI format schedules one of the following: Physical Downlink Shared Channel (PDSCH) reception or Physical Uplink Shared Channel (PUSCH) transmission on one of the first group of N1 cells, or PDSCH reception or PUSCH transmission on multiple cells of up to M cells in the second group of N2 cells. M is greater than 1. The UE also includes a processor operatively connected to the transceiver. The processor is configured to determine the total number of PDCCH receptions in a time slot on the scheduled cells based on the ratio of N1 and N2 to M. The transceiver is also configured to receive multiple PDCCHs in a time slot on the scheduled cells that are no greater than this total number.

[0013] In yet another embodiment, a base station is provided. The base station includes a transceiver configured to transmit information from a first group of N1 cells and a second group of N2 cells. The PDCCH provides a DCI format. The DCI format schedules one of the following: PDSCH transmission or PUSCH reception on one cell of the first group of N1 cells, or PDSCH transmission or PUSCH reception on multiple cells of up to M cells of the second group of N2 cells. M is greater than 1. The base station also includes a processor operatively connected to the transceiver. The processor is configured to determine the total number of PDCCH transmissions in a time slot on the scheduled cells based on the ratios of N1 and N2 to M. The transceiver is also configured to transmit a plurality of PDCCHs in a time slot on the scheduled cells that is not greater than this total number.

[0014] Other technical features will be apparent to those skilled in the art from the following figures, description and claims.

[0015] Before proceeding with the detailed implementation below, it may be advantageous to define certain words and phrases used in this patent document. The term “coupled” and its derivatives refer to any direct or indirect communication between two or more elements, regardless of whether these elements are physically in contact with each other. The terms “transmit,” “receive,” and “communicate,” and their derivatives include both direct and indirect communication. The terms “comprise” and “include,” and their derivatives, mean unrestricted inclusion. The term “or” is inclusive, meaning and / or. The phrase “associated with” and its derivatives refer to including, being included, interconnected with, containing, being contained, connected to or connected to, coupled to or coupled with, able to communicate with, cooperate with, intertwine, juxtapose, proximate, combined with or combined with, having, possessing the properties of, having a relationship to, or having a relationship with, etc. The term “controller” refers to any device, system, or part thereof that controls at least one operation. Such a controller 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, local or remote. When used with a list of items, the phrase "at least one of..." means that different combinations of one or more of the listed items may be used, and it may be necessary to use only one item from the list. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

[0016] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each of which is formed by computer-readable program code and contained in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, associated data, or portions thereof suitable for implementation 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 accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drives, compact discs (CDs), digital video discs (DVDs), or any other type of storage. "Non-transitory" computer-readable media excludes wired, wireless, optical, or other communication links that transmit temporary electrical or other signals. Non-transitory computer-readable media includes media that can permanently store data and media that can store data and be overwritten later, such as rewritable optical discs or erasable memory devices.

[0017] Definitions of other specific words and phrases are also provided in this patent document. Those skilled in the art will understand that, in many (if not most) cases, such definitions apply to the prior and future use of the words and phrases defined in this way.

[0018] Publicly disclosed beneficial effects

[0019] According to this disclosure, improvements are made in multi-cell scheduling with reduced control overhead and in aspects related to multi-cell scheduling with reduced control overhead. Attached Figure Description

[0020] To gain a more complete understanding of this disclosure and its advantages, reference is now made to the following description in conjunction with the accompanying drawings, wherein like reference numerals denote like parts:

[0021] Figure 1 An example wireless network according to an embodiment of the present disclosure is shown;

[0022] Figure 2 An example base station (BS) according to an embodiment of the present disclosure is shown;

[0023] Figure 3 An example user equipment (UE) according to an embodiment of the present disclosure is shown;

[0024] Figure 4 and Figure 5 An example wireless transmission and reception path according to an embodiment of this disclosure is shown;

[0025] Figure 6 A block diagram of an example transmitter structure using orthogonal frequency division multiplexing (OFDM) according to an embodiment of the present disclosure is shown;

[0026] Figure 7 A block diagram of an example receiver structure using OFDM according to an embodiment of the present disclosure is shown;

[0027] Figure 8 An example encoding process for downlink control information (DCI) format according to an embodiment of the present disclosure is shown;

[0028] Figure 9 An example decoding process for a DCI format for a UE is shown according to an embodiment of this disclosure;

[0029] Figure 10 An example method is shown, according to an embodiment of the present disclosure, for a UE to determine the size of the DCI format received on two corresponding physical downlink shared channels (PDSCH) in two separate cells;

[0030] Figure 11An example method is shown, according to an embodiment of the present disclosure, in which a UE determines a modulation and coding scheme (MCS) for a second PDSCH reception scheduled by a DCI format that schedules two PDSCH receptions on corresponding two cells;

[0031] Figure 12 An example method is shown according to an embodiment of the present disclosure in which the UE determines the frequency domain resource allocation for PDSCH reception based on the DCI format of the scheduled PDSCH reception;

[0032] Figure 13 A diagram illustrating the downlink assignment index (DAI) value in a DCI format for scheduling two PDSCH receptions on two corresponding cells and another DCI format for scheduling PDSCH receptions on one cell, according to an embodiment of the present disclosure.

[0033] Figure 14 An example method is shown according to an embodiment of the present disclosure in which a UE determines a first power and a second power transmitted by a corresponding first physical uplink shared channel (PUSCH) and a second PUSCH scheduled in a corresponding first cell and a second cell, according to a DCI format.

[0034] Figure 15 An example method is shown in which a UE reuses UCI in a PUSCH transmission in response to the detection of a DCI format that schedules two PUSCH transmissions on two corresponding cells, according to an embodiment of the present disclosure.

[0035] Figure 16 , Figure 17 and Figure 18 An example method is shown, according to embodiments of the present disclosure, in which a UE determines the number of Physical Downlink Control Channel (PDCCH) candidates to be monitored in a time slot in order to schedule PDCCH candidate scaling on the cell; and

[0036] Figure 19 An example method for a UE to switch between multiple sets of search spaces according to an embodiment of the present disclosure is shown. Detailed Implementation

[0037] The following discussion Figures 1 to 19 The various embodiments used to describe the principles of this disclosure in this patent document are merely exemplary and should not be construed in any way as limiting the scope of this disclosure. Those skilled in the art will understand that the principles of this disclosure can be implemented in any suitably arranged system or device.

[0038] The following references are incorporated herein by reference as if fully described herein: 3GPP TS 38.211 v16.2.0, “NR; Physical channels and modulation”; 3GPP TS 38.212 v16.2.0, “NR; Multiplexing and Channel coding”; 3GPP TS 38.213 v16.2.0, “NR; Physical Layer Procedures for Control”; 3GPP TS 38.214 v16.2.0, “NR; Physical Layer Procedures for Data”; 3GPP TS 38.321 v16.1.0, “NR; Medium Access Control (MAC) protocol specification”; and 3GPP TS 38.331 v16.1.0, “NR; Radio Resource Control (RRC) Protocol Specification”.

[0039] To meet the increased demand for wireless data traffic since the deployment of fourth-generation (4G) communication systems, efforts have been made to develop and deploy improved fifth-generation (5G) or near-5G / NR communication systems. Therefore, 5G or near-5G communication systems are also referred to as "beyond 4G networks" or "post-LTE systems."

[0040] 5G communication systems are considered to be implemented in higher frequency (millimeter wave) bands (e.g., 28 GHz or 60 GHz bands) to achieve higher data rates, or in lower frequency bands (e.g., 6 GHz) to achieve robust coverage and mobility support. To reduce radio wave propagation loss and increase transmission distance, beamforming, massive MIMO, full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive MIMO technologies are discussed in 5G communication systems.

[0041] In addition, in 5G communication systems, development is underway to improve the system network based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multipoint (CoMP), and receiver interference cancellation.

[0042] The discussion of 5G systems and associated frequency bands is for reference only, as some embodiments of this disclosure can be implemented in 5G systems. However, this disclosure is not limited to 5G systems or associated frequency bands, and embodiments of this disclosure can be used in conjunction with any frequency band. For example, aspects of this disclosure can also be applied to 5G communication systems, 6G, or even higher deployments that can use terahertz (THz) frequency bands.

[0043] Depending on the network type, the term "base station" (BS) can refer to any component (or set of components) configured to provide wireless access to a network, such as a transmitting point (TP), a transmitting and receiving point (TRP), an enhanced base station (eNodeB or eNB), a gNB, a macrocell, a femtocell, a WiFi access point (AP), a satellite, or other wireless-enabled equipment. A base station can provide wireless access according to one or more wireless communication protocols, such as 5G 3GPP New Radio Interface / Access (NR), LTE, Advanced LTE (LTE-A), High-Speed ​​Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. The terms "BS," "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 "user equipment" (UE) can refer to any component, such as a mobile station, a subscriber station, a remote terminal, a wireless terminal, a receiving point, a carrier, or a user device. For example, a UE can be a mobile phone, smartphone, surveillance equipment, alarm equipment, fleet management equipment, asset tracking equipment, automobile, desktop computer, entertainment equipment, infotainment equipment, vending machine, electricity meter, water meter, gas meter, security equipment, sensor equipment, electrical appliances, etc.

[0044] The following Figures 1-3 Various embodiments of communication technologies, such as Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA), are described in wireless communication systems. Figures 1-3 The description does not imply any physical or architectural limitation on the ways in which different embodiments may be implemented. Different embodiments of this disclosure can be implemented in any suitably arranged communication system.

[0045] Figure 1 An example wireless network 100 according to an embodiment 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.

[0046] like Figure 1As shown, the wireless network 100 includes base station BS 101 (e.g., gNB), BS 102, and BS 103. BS 101 communicates with BS 102 and BS 103. BS 101 also communicates with at least one network 130 (such as the Internet, a proprietary Internet Protocol (IP) network, or other data network).

[0047] BS 102 provides wireless broadband access to network 130 to a first plurality of user equipments (UEs) within its coverage area 120. The first plurality of UEs includes UE 111, which may be located in a small business; UE 112, which may be located in an enterprise (E); UE 113, which may be located in 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. BS 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 BS 101-103 may use 5G / NR, Long Term Evolution (LTE), Long Term Evolution Advanced (LTE-A), WiMAX, WiFi or other wireless communication technologies to communicate with each other and with UE111-116.

[0048] The dashed lines indicate the approximate extent of coverage areas 120 and 125, which are shown as approximately circular for illustrative and explanatory purposes only. It should be clearly understood that, depending on the configuration of the BS and variations in the radio environment associated with natural and man-made obstacles, the coverage areas associated with the BS (such as coverage areas 120 and 125) may have other shapes, including irregular shapes.

[0049] As described in more detail below, one or more of UEs 111-116 include circuitry, procedures, or combinations thereof for receiving multi-cell scheduling and PDCCH allocation. In some embodiments, one or more of BSs 101-103 include circuitry, procedures, or combinations thereof for multi-cell scheduling and PDCCH allocation.

[0050] although Figure 1 An example of a wireless network is shown, but more can be found on... Figure 1Various modifications can be made. For example, the wireless network can include any number of BSs and any number of UEs in any suitable arrangement. Furthermore, BS 101 can communicate directly with any number of UEs and provide these UEs with wireless broadband access to network 130. Similarly, each BS 102-103 can communicate directly with network 130 and provide the UEs with direct wireless broadband access to network 130. Additionally, BS 101, 102, and / or 103 can provide access to other or additional external networks (such as external telephone networks or other types of data networks).

[0051] Figure 2 An example BS 102 according to an embodiment of the present disclosure is shown. Figure 2 The embodiment of BS 102 shown is for illustrative purposes only, and Figure 1 BS 101 and 103 can have the same or similar configurations. However, BSs have a wide variety of configurations, and Figure 2 This disclosure is not intended to limit the scope to any particular implementation of BS.

[0052] like Figure 2 As shown, BS 102 includes multiple antennas 205a-205n, multiple radio frequency (RF) transceivers 210a-210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. BS 102 also includes a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0053] RF transceivers 210a-210n receive incoming RF signals, such as signals transmitted by a UE in wireless network 100, from antennas 205a-205n. RF transceivers 210a-210n down-convert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 220, which generates a processed baseband signal by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 220 sends the processed baseband signal to controller / processor 225 for further processing.

[0054] The TX processing circuit 215 receives analog or digital data (such as 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 outgoing 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.

[0055] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the BS 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 support multi-cell scheduling and PDCCH allocation. The controller / processor 225 may support any of a variety of other functions in the BS 102. In some embodiments, the controller / processor 225 includes at least one microprocessor or microcontroller.

[0056] The controller / processor 225 is also capable of executing programs and other processes residing in the memory 230, such as an operating system. The controller / processor 225 can move data into or out of the memory 230 as needed by the executing process. For example, the controller / processor 225 can move data into or out of the memory 230 according to the process being executed.

[0057] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the BS 102 to communicate with other devices or systems via a backhaul connection or over a network. The network interface 235 can support communication via any suitable wired or wireless connection. For example, when the BS 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G / NR, LTE, or LTE-A), the network interface 235 can allow the BS 102 to communicate with other BSs via a wired or wireless backhaul connection. When the BS 102 is implemented as an access point, the network interface 235 can allow the BS 102 to communicate with a larger network (such as the Internet) via a wired or wireless local area network or via a wired or wireless connection. The network interface 235 includes any suitable architecture that supports communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0058] The memory 230 is coupled to the controller / processor 225. A portion of the memory 230 may include RAM, while another portion of the memory 230 may include flash memory or other ROM.

[0059] although Figure 2 An example of BS 102 is shown, but it is possible to compare it with other versions. Figure 2 Various changes can be made. For example, BS 102 can include any number of Figure 2Each component is shown. As a specific example, an access point may include multiple network interfaces 235, and the controller / processor 225 may support routing functionality for routing data between different network addresses. As another specific example, although shown as a single instance of TX processing circuitry 215 and a single instance of RX processing circuitry 220, BS 102 may include multiple instances of each (such as one instance per RF transceiver). Furthermore, Figure 2 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed.

[0060] Figure 3 An example UE 116 according to an embodiment of the present 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 a wide variety of configurations, and Figure 3 This disclosure is not intended to limit the scope to any particular implementation of the UE.

[0061] like Figure 3 As shown, UE 116 includes an antenna 305, an RF transceiver 310, a TX processing circuit 315, a microphone 320, and a receive (RX) processing circuit 325. UE 116 also includes a speaker 330, a processor 340, an input / output (I / O) interface (IF) 345, an input device 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0062] RF transceiver 310 receives incoming RF signals transmitted by a BS of wireless network 100 from antenna 305. RF transceiver 310 down-converts the incoming RF signals 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 processor 340 for further processing (e.g., for web browsing data).

[0063] The TX processing circuit 315 receives analog or digital voice data from the microphone 320, or other outgoing baseband data (such as network data, email, or interactive video game data) from the processor 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing 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 via the antenna 305.

[0064] Processor 340 may include one or more processors or other processing devices and executes OS 361 stored in memory 360 to control the overall operation of UE 116. For example, processor 340 may control the RF transceiver 310, RX processing circuit 325, and TX processing circuit 315 to receive forward channel signals and transmit reverse channel signals according to known principles. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.

[0065] Processor 340 is also capable of executing other processes and programs residing in memory 360, such as processes for beam management. 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 BS 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 laptop computers and handheld computers. I / O interface 345 is the communication path between these accessories and processor 340.

[0066] Processor 340 is also coupled to input device 350. An operator of UE 116 can use input device 350 to input data into UE 116. Input device 350 may be a keyboard, touchscreen, mouse, trackball, voice input, or other device capable of acting as a user interface allowing the user to interact with UE 116. For example, input device 350 may include voice recognition processing, thereby allowing the user to input voice commands. In another example, input device 350 may include a touch panel, (digital) pen sensor, button, or ultrasonic input device. For example, a touch panel may recognize touch input using at least one method, such as capacitive, pressure-sensitive, infrared, or ultrasonic.

[0067] The processor 340 is also coupled to a display 355. The display 355 may be a liquid crystal display, a light-emitting diode display, or other display capable of displaying text (such as from a website) and / or at least limited graphics.

[0068] The memory 360 is coupled to the processor 340. A portion of the memory 360 may include random access memory (RAM), while another portion of the memory 360 may include flash memory or other read-only memory (ROM).

[0069] although Figure 3 An example of UE 116 is shown, but it is possible to modify it. Figure 3 Make various changes. For example, Figure 3 The 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 UE 116 is shown configured as a mobile phone or smartphone, but the UE can be configured to operate as other types of mobile or fixed devices.

[0070] Figure 4 and Figure 5 An example wireless transmission and reception path according to this disclosure is shown. In the following description, Figure 4 The sending path 400 can be described as being implemented in a BS (such as BS 102), while Figure 5 The receive path 500 can be described as being implemented in a UE (such as UE 116). However, it is understood that the receive path 500 can be implemented in a BS, and the transmit path 400 can be implemented in a UE. In some embodiments, the receive path 500 is configured to support multi-cell scheduling and PDCCH allocation, as described in embodiments of this disclosure.

[0071] like Figure 4 The transmission path 400 shown includes a channel coding and modulation block 405, a serial-to-parallel (S-to-P) block 410, an N-size inverse fast Fourier transform (IFFT) block 415, a parallel-to-serial (P-to-S) block 420, a cyclic prefix addition block 425, and an up-converter (UC) 430. For example... Figure 5 The receiver path 500 shown includes a downconverter (DC) 555, a cyclic prefix removal block 560, a serial-to-parallel (S-to-P) block 565, a fast Fourier transform (FFT) block of size N, a parallel-to-serial (P-to-S) block 575, and a channel decoding and demodulation block 580.

[0072] like Figure 4As shown, channel coding and modulation block 405 receives a set of information bits, applies coding (such as low-density parity-check (LDPC) coding), and modulates the input bits (such as with quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a sequence of frequency-domain modulated symbols. Serial-to-parallel block 410 converts (e.g., demultiplexes) the serially modulated symbols into parallel data to generate N parallel symbol streams, where N is the IFFT / FFT size used in BS 102 and UE 116. IFFT block 415 of size N performs IFFT operations on the N parallel symbol streams to generate a time-domain output signal. Parallel-to-serial block 420 converts (e.g., multiplexes) the parallel time-domain output symbols from IFFT block 415 of size N to generate a serial time-domain signal. Cyclic prefix addition block 425 inserts a cyclic prefix into the time-domain signal. Upconverter 430 modulates (e.g., upconverts) the output of cyclic prefix addition block 425 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at the baseband before being switched to the RF frequency.

[0073] The RF signal transmitted from BS 102 reaches UE 116 after passing through the wireless channel, and UE 116 performs the opposite operation to that at BS 102.

[0074] like Figure 5 As shown, downconverter 555 downconverts the received signal to the baseband frequency, and cyclic prefix removal block 560 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 565 converts the time-domain baseband signal into a parallel time-domain signal. FFT block 570 of size N performs an FFT algorithm to generate N parallel frequency-domain signals. Parallel-to-serial block 575 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 580 demodulates and decodes the modulated symbols to recover the original input data stream.

[0075] Each BS 101-103 can achieve the following: Figure 4 The transmission path 400 shown is similar to transmission to UE111-116 in the downlink, and can achieve the following: Figure 5 The received path 500 shown is similar to receiving from UE111-116 in the uplink. Similarly, each of UEs 111-116 can implement a transmitted path 400 for transmitting to BS 101-103 in the uplink, and can implement a received path 500 for receiving from BS 101-103 in the downlink.

[0076] Figure 4 and Figure 5 Each component can be implemented using hardware or a combination of hardware and software / firmware. As a specific example, Figure 4 and Figure 5 At least some components can be implemented in software, while others can be implemented in configurable hardware or a hybrid of software and configurable hardware. For example, FFT block 570 and IFFT block 515 can be implemented as configurable software algorithms, where the value of size N can be modified depending on the implementation.

[0077] Furthermore, although described as using FFT and IFFT, this is merely exemplary and should not be construed as limiting the scope of this disclosure. Other types of transforms, such as the Discrete Fourier Transform (DFT) and Inverse Discrete Fourier Transform (IDFT) functions, can be used. It will be understood that for the DFT and IDFT functions, the value of the variable N can be any integer (such as 1, 2, 3, 4, etc.), while for the FFT and IFFT functions, the value of the variable N can be any integer that is a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0078] although Figure 4 and Figure 5 An example of a wireless transmit and receive path is shown, but it is possible to modify it further. Figure 4 and Figure 5 Make various changes. For example, Figure 4 and Figure 5 The various components can be combined, further subdivided, or omitted, and additional components can be added as needed. Furthermore, Figure 4 and Figure 5 This is intended to illustrate examples of the types of send and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0079] The unit on a cell used for downlink (DL) or uplink (UL) signaling is called a time slot, and may include one or more symbols. A bandwidth (BW) unit is called a resource block (RB). An RB comprises multiple subcarriers (SCs). For example, a time slot may have a duration of 1 millisecond, while an RB may have a bandwidth of 180 kHz and include 12 SCs spaced 15 kHz apart. The subcarrier spacing (SCS) can be determined by the SCS configuration μ, which is 2. μ • 15kHz. A cell on a subcarrier in a symbol is called a resource element (RE). A cell on a redundancy block (RB) in a symbol is called a physical redundancy block (PRB).

[0080] DL signals include data signals that transmit information content, control signals that transmit DL control information (DCI), and reference signals (RS), also known as pilot signals. The BS (such as BS 102) transmits data information or DCI via the corresponding Physical DL Shared Channel (PDSCH) or Physical DL Control Channel (PDCCH). PDSCH or PDCCH can be transmitted on a variable number of time slot symbols, each including one time slot symbol. The BS transmits one or more RSs, including Channel State Information RS (CSI-RS) and Demodulation RS (DM-RS). CSI-RS is intended for use by the UE (such as UE 116) to perform measurements and provide Channel State Information (CSI) to the BS. For channel measurements or for time tracking, non-zero power CSI-RS (NZP CSI-RS) resources can be used. For Interference Measurement Reporting (IMR), CSI Interference Measurement (CSI-IM) resources can be used. CSI-IM resources can also be associated with zero power CSI-RS (ZP CSI-RS) configurations. The UE can determine the CSI-RS reception parameters via DL control signaling or higher-layer signaling (such as Radio Resource Control (RRC) signaling from the gNB). Typically, DM-RS is transmitted only within the BW of the corresponding PDCCH or PDSCH, and the UE can use this DM-RS to demodulate data or control information.

[0081] The UL signal also includes data signals for transmitting information content, control signals for transmitting UL control information (UCI), a DM-RS associated with data or UCI demodulation, a probe RS (SRS) enabling the gNB to perform UL channel measurements, and a random access (RA) preamble enabling the UE (such as UE 116) to perform random access. The UE transmits data information or UCI via the corresponding Physical UL Shared Channel (PUSCH) or Physical UL Control Channel (PUCCH). PUSCH or PUCCH can be transmitted on a variable number of time slot symbols, each comprising one time slot symbol. When the UE transmits both data information and UCI simultaneously, at least when transmissions are on different cells, the UE can multiplex both data information and UCI in the PUSCH, or, depending on the UE's capabilities, transmit both a PUSCH with data information and a PUCCH with UCI.

[0082] UCI includes a Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message indicating correct or incorrect detection of a data transfer block (TB) or code block group (CGB) in the PDSCH, a scheduling request (SR) indicating whether the UE has data to send in its buffer, and a CSI report enabling the gNB to select appropriate parameters for PDSCH or PDCCH transmission to the UE. The CSI report may include: a Channel Quality Indicator (CQI) informing the gNB of the maximum modulation and coding scheme (MCS) for the UE to detect a data TB with a predetermined block error rate (BLER) (such as 10% BLER); a Precoding Matrix Indicator (PMI) informing the gNB how signals from multiple transmitter antennas are combined according to the Multiple-Input Multiple-Output (MIMO) transmission principle; a CSI-RS Resource Indicator (CRI) informing the gNB for obtaining the CSI report; and a Rank Indicator (RI) informing the gNB of the transmission rank of the PDSCH. In some embodiments, UL RS includes DM-RS and SRS. DM-RS is typically transmitted within the BW of the corresponding PUSCH or PUCCH. The gNB can use DM-RS to demodulate information in the corresponding PUSCH or PUCCH. SRS is sent by the UE to provide ULCSI to the gNB, and for TDD systems, PMI for DL ​​transmission is also provided. Furthermore, the UE can send the Physical Random Access Channel (PRACH) as part of the random access procedure or for other purposes.

[0083] DL and UL transmissions can be based on orthogonal frequency division multiplexing (OFDM) waveforms, which include variants using DFT precoding, known as DFT spread spectrum OFDM.

[0084] Figure 6 A block diagram 600 illustrating an example transmitter structure using orthogonal frequency division multiplexing (OFDM) according to an embodiment of the present disclosure is shown. Figure 7 A block diagram 700 illustrating an example receiver structure using OFDM according to an embodiment of the present disclosure is shown.

[0085] The transmitter structure shown in block diagram 600 and the receiver structure shown in block diagram 600 can be similar to... Figure 2 RF transceivers 210a-210n and Figure 3 The RF transceiver 310. Figure 6 Example block diagram 600 and Figure 7 The block diagram 700 is for illustration only, and other embodiments may be used without departing from the scope of this disclosure.

[0086] As shown in block diagram 600, information bits 610, such as DCI bits or data bits, are encoded by encoder 620, rate-matched to the assigned time / frequency resource by rate matcher 630, and modulated by modulator 640. Subsequently, the modulated coded symbols and DMRS or CSI-RS 650 are mapped to SC by SC mapping unit 660 using input from BW selector unit 665, filter 670 performs inverse fast Fourier transform (IFFT), CP insertion unit 680 adds cyclic prefix (CP), and the resulting signal is filtered by filter 690 and transmitted as transmit bit 695 by radio frequency (RF) unit.

[0087] As shown in block diagram 700, the received signal 710 is filtered by filter 720, CP removal unit 730 removes CP, filter 740 applies Fast Fourier Transform (FFT), SC demapping unit 750 demaps the SC selected by BW selector unit 755, channel estimator and demodulator unit 760 demodulates the received symbols, rate dematcher 770 restores rate matching, and decoder 780 decodes the obtained bits to provide information bits 790.

[0088] In some embodiments, the UE monitors multiple candidate locations for a corresponding potential PDCCH reception to decode multiple DCI formats in the time slot. The DCI format includes Cyclic Redundancy Check (CRC) bits to allow the UE to confirm correct detection of the DCI format. One type of DCI format is identified by a Radio Network Temporary Identifier (RNTI) of the CRC bits of the scrambled DCI format.

[0089] For the DCI format that schedules PDSCH or PUSCH to a single UE, the RNTI can be the cell RNTI (C-RNTI), the configured scheduling RNTI (CS-RNTI), or the MCS-C-RNTI, and is used as the UE identifier. In the examples below, the C-RNTI will be referenced where necessary. The UE typically receives / monitors the PDCCH for detection of the DCI format with a CRC scrambled by the C-RNTI according to the UE-specific search space (USS).

[0090] For the DCI format of the PDSCH that schedules the transmission of System Information (SI), the RNTI can be SI-RNTI. For the DCI format of the PDSCH that schedules the provision of Random Access Response (RAR), the RNTI can be RA-RNTI. For the DCI format of the PDSCH that schedules the provision of paging information, the RNTI can be P-RNTI. There are also several other RNTIs associated with DCI formats that provide various control information, and these are monitored according to the Common Search Space (CSS).

[0091] Figure 8 An example encoding process 800 for a downlink control information (DCI) format according to an embodiment of the present disclosure is shown. Figure 9 An example decoding process 900 for a DCI format for a UE according to an embodiment of the present disclosure is shown. Figure 8 The encoding process 800 and Figure 9 The decoding process 900 is for illustrative purposes only, and other embodiments may be used without departing from the scope of this disclosure.

[0092] The BS encodes and transmits each DCI format separately in the corresponding PDCCH. Where applicable, the DCI format is designed to mask the CRC of the DCI format codeword for the UE's RNTI so that the UE can recognize the DCI format. For example, the CRC may include 16 bits or 24 bits, and the RNTI may include 16 bits or 24 bits. Otherwise, when the RNTI is not included in the DCI format, the DCI format type indicator field may be included in the DCI format.

[0093] like Figure 8 As shown, the CRC calculation unit 820 is used to determine the CRC of the (uncoded) DCI format bits 810, and the CRC is masked using an XOR operation unit 830 between the CRC bits and the RNTI bits 840. The XOR operation is defined as XOR(0,0)=0, XOR(0,1)=1, XOR(1,0)=1, XOR(1,1)=0. The masked CRC bits are appended to the DCI format information bits using a CRC appending unit 850. The encoder 860 performs channel coding (such as tail-biting convolutional coding or polar coding), followed by rate matching of the allocated resources by a rate matcher 870. The interleaving and modulation unit 880 applies interleaving and modulation (such as QPSK), and an output control signal 890 is transmitted.

[0094] like Figure 9 As shown, the received control signal 910 is demodulated and deinterleaved by the demodulator and deinterleaver 920. The rate match applied at the BS transmitter is recovered by the rate matcher 930, and the resulting bits are decoded by the decoder 940. After decoding, the CRC extractor 950 extracts the CRC bits and provides DCI format information bits 960. The DCI format information bits are demasked 970 by an XOR operation with RNTI 980 (where applicable), and unit 990 performs a CRC check. When the CRC check is successful (checksum is zero), the DCI format information bits are considered valid. When the CRC check is unsuccessful, the DCI format information bits are considered invalid.

[0095] Table 1 below describes the fields of DCI format 1_2 for scheduling UE PDSCH reception on a single cell.

[0096] Table 1

[0097]

[0098]

[0099] Table 2 below describes the fields of DCI format 0_2 for scheduling PUSCH transmissions from a UE on a single cell.

[0100] Table 2

[0101]

[0102]

[0103] In some embodiments, PDCCH transmission can be within a set of PRBs. The BS can configure one or more PRB sets, also known as control resource sets (CORESETs), to the UE for PDCCH reception. PDCCH reception can be performed within the control channel elements (CCEs) included in the CORESET.

[0104] The UE can monitor the PDCCH based on either a first PDCCH monitoring type or a second PDCCH monitoring type. For the first PDCCH monitoring type corresponding to the UE's capability for PDCCH monitoring per time slot, the maximum number of PDCCH candidates is defined per time slot. and the maximum number of non-overlapping CCEs received for PDCCH candidates Non-overlapping CCEs are CCEs that have different indices or are in different symbols of a CORESET or in different CORESETs.

[0105] In some embodiments, if the UE (such as UE 116) can support The first set of service areas and The second set of serving cells, for the purpose of reporting pdcch-BlindDetectionCA, the UE determines the number of serving cells to be... Where R is the value reported by the UE. In this embodiment, (i) The first set of serving cells, wherein the UE is either not provided with a CORESETPoolIndex or is provided with a CORESETPoolIndex (which has a single value for all CORESETs on all DL BWPs of each serving cell in the first set of serving cells), and (ii) The second set of serving cells (where the UE is provided with a CORESETPoolIndex, which has a value of 0 for the first CORESET on any DL BWP of each serving cell in the second set of serving cells, and a value of 1 for the second CORESET on any DL BWP of each serving cell in the second set of serving cells) is associated.

[0106] In some embodiments, if the UE (such as UE 116)(i) is configured with (ii) Associated with downlink cells, and (iii) with PDCCH candidates monitored in the active DL BWP using SCS configuration μ in the scheduling cell, where Furthermore, if (iii) the active cell's DL BWP is the active DL BWP of the active cell, and the deactivated cell's DL BWP is the DL BWP whose index is provided by the deactivated cell's firstActiveDownlinkBWP-Id, then the UE is not required to... The activity of the scheduling cell in each downlink cell is monitored on the DL BWP, with more than [number] monitoring sessions per time slot. PDCCH candidates or more There are non-overlapping CCEs. In this example... It equals 4 or is a capability reported by the UE. Furthermore, in this example, γ is a value provided to the UE by a higher layer or R.

[0107] For each scheduled cell, the UE is not required to... On the active DL BWP of the scheduling cell in each downlink cell, with SCS configuration μ, more than [number] monitoring sessions are conducted for each time slot. PDCCH candidates or more Non-overlapping CCEs.

[0108] Similarly, for each scheduled cell, the UE is not required to... On the active DL BWP of the scheduling cell in each downlink cell, with SCS configuration μ, more than [number] monitoring sessions are conducted for each time slot. PDCCH candidates or more Non-overlapping CCEs. Furthermore, for each scheduled cell, for CORESETs with the same CORESETPoolIndex value, the UE is not required to... On the active DL BWP of the scheduling cell in each downlink cell, with SCS configuration μ, more than [number] monitoring sessions are conducted for each time slot. PDCCH candidates or more There are non-overlapping CCEs. If no CORESETPoolIndex is provided for the cell, or if a single CORESETPoolIndex is provided for the cell, then γ = 0.

[0109] In some embodiments, the UE determines the CCE for decoding PDCCH candidates based on a search space. For some RNTIs (such as C-RNTI), the set of PDCCH candidates for the corresponding DCI format defines a corresponding UE-specific search space set. For other RNTIs (such as SI-RNTI), the set of PDCCH candidates for the corresponding DCI format defines a corresponding common search space set (CSS set). The search space set is associated with a CORESET, where the UE monitors PDCCH candidates for the search space set. The UE is expected to monitor PDCCH candidates for up to four sizes of DCI formats (including up to three sizes of DCI formats, each with a CRC scrambled by C-RNTI or MCS-C-RNTI for each serving cell). For the corresponding active DL BWP, the UE can count the number of DCI format sizes for each serving cell based on the number of PDCCH candidates configured in the corresponding search space set.

[0110] In some embodiments, for cross-carrier scheduling, for each scheduled cell, the number of PDCCH candidates for monitoring and the number of non-overlapping CCEs are counted for each span or each time slot.

[0111] For the search space set s associated with CORESET p, for the carrier indicator field value n CI The corresponding service cell activity DL BWP, and time slot PDCCH candidates in the search space set The corresponding CCE index for aggregation level L is given by equation (1) below. As stated in equation (1), for any CSS, Similarly, for USS, Y p，-1 =n RNTI ≠0; for pmod3=0, A p =39827; for pmod3=1, A p =38929; for pmod3=2, A p =39839 and D=65537. Furthermore, as stated in equation (1), i=0,…,L-1, and N CCE，p It is a numbered CORESET p from 0 to N CCE，p The number of CCEs is -1. Similarly, if the UE is configured with a carrier indicator field for monitoring the serving cell on its PDCCH, then nCI It is the carrier indicator field value; otherwise, including for any CSS, n CI =O. The expression described in equation (1) Show in It is for n CI For the corresponding serving cell, the UE is configured to monitor the number of PDCCH candidates at the aggregation level L for the search space set s. For USS, It refers to n for all configurations of CCE aggregation level L for the search space set s. CI value The maximum value in n. Furthermore, for n RNTI The RNTI value is C-RNTI.

[0112]

[0113] In some embodiments, the UE (such as UE 116) monitors the PDCCH according to the CSS to schedule PDSCHs that provide system information, random access responses, or paging only on a cell referred to as the primary cell. The UE transmits PUCCHs only on the primary cell. In some embodiments, the UE is configured as a primary-secondary cell (PSCell) for PUCCH transmission. When the UE is configured as a PSCell, the UE transmits PUCCHs on the primary cell of the primary / primary cell group and on the PSCell of the secondary cell group. For brevity, the embodiments described in this disclosure consider the primary cell, but the embodiments can be directly extended to the PSCell.

[0114] In some embodiments, the ability of a gNB (such as BS 102) to schedule a UE (such as UE 116) on a cell depends on the maximum PDCCH monitoring capability of the UE for scheduling on the cell, determined by... Each time slot of the scheduling cell in each downlink cell PDCCH candidates and A non-overlapping CCE or composed of... Scheduling cells in downlink cells PDCCH candidates and To define. Although and For SCS configuration, μ is a predetermined quantity. and It is variable and depends on the total number of cells configured for SCS (μ). And the total number of cells across all SCS configurations. Since the UE can deterministically know at a given time that it cannot be scheduled in certain cells, the decision is based on the number of configured cells. and This can lead to an underestimation of the UE's PDCCH monitoring capabilities, so the corresponding PDCCH monitoring capabilities can be reassigned to other cells that can be scheduled.

[0115] At least for initial deployment, UEs using New Radio (NR) radio access technology (NR UE) and legacy UEs using Long Term Evolution (LTE) radio access technology (LTE UE) coexist in the same network. To achieve this coexistence in the same spectrum, Dynamic Spectrum Sharing (DSS) is used, where NR UEs and LTE UEs share the same channels, and the network can dynamically allocate resources between LTE UEs and NR UEs. During certain time instances (NR time slots or LTE subframes), the network can allocate most of the DL resources to LTE UEs, while the UL spectrum is typically not fully utilized and can be used for transmissions from either NR UE or LTE UE. It is also possible that some DL spectrum can be used for PDSCH reception of NR UEs. To support such operation for NR UEs capable of carrier aggregation (CA), PDCCH reception scheduled for PDSCH reception on a first cell where LTE UEs and NR UEs coexist can be offloaded to a second cell where only NR UEs exist. Because the first cell is typically a macro cell providing synchronization signals and broadcast system information, it is the primary cell, while the second cell is the secondary cell. However, DSS operation can also be applied to the secondary cell. Generally, using DSS, an NR UE can be scheduled from a first cell, such as a primary cell, or from a second cell, such as an SCell. In the remainder of this disclosure, unless explicitly stated otherwise, the term UE refers to an NR UE.

[0116] Scheduling a UE from a primary cell (such as a secondary cell) to a primary cell (such as a first cell) creates additional conditions for PDCCH monitoring on both the primary and secondary cells. One such condition is that, for the primary cell, up to three DCI formats of different sizes are maintained for each serving cell, with their CRC scrambled by C-RNTI. Another condition involves when the UE is configured by UE-specific RRC signaling to monitor the PDCCH used for DCI format detection on the secondary cell according to a CSS (referred to as Type 3-PDCCH CSS): the secondary cell is treated as the primary cell relative to the over-subscribed PDCCH capacity of the UE on the secondary cell, and then search space set discarding must be performed by prioritizing the search space set corresponding to the PDCCH monitoring according to the CSS.

[0117] To reduce the PDCCH overhead used for scheduling PDSCH reception or PUSCH transmission in CA operations, a single DCI format can be used to schedule multiple PDSCH receptions or multiple PUSCH transmissions from the UE across the corresponding multiple cells. For simplicity, the DCI format is referred to as DCI format 0_3 for scheduling PUSCH transmission or DCI format 1_3 for scheduling PDSCH reception.

[0118] Compared to using multiple corresponding DCI formats, DCI format 1_3 allows for a single CRC and may also potentially allow single values ​​for other fields, such as the PUCCH resource indicator for PUCCH transmission with HARQ-ACK information corresponding to multiple PDSCH receptions, the PDSCH-to-HARQ-ACK timing field indicating the time slot for PUCCH transmission, the Transmission Power Control (TPC) command field, and the Downlink Assignment Index (DAI) field for determining the HARQ-ACK codebook. Since the UE can detect DCI format 1_3 more reliably than with DCI formats that schedule single PDSCH receptions (where loss detection results in multiple PDSCH receptions being lost), it is important to maintain the small size of DCI format 1_3 to achieve meaningful resource savings compared to using multiple DCI formats to schedule individual PDSCH receptions.

[0119] Therefore, embodiments of this disclosure consider the need to design a DCI format for scheduling UE PDSCH reception on multiple cells, and to provide a DCI format size that is substantially a multiple of the size of a DCI format for scheduling UE PDSCH reception on a single cell.

[0120] Embodiments of this disclosure also consider the need to design a DCI format that schedules PUSCH transmissions from the UE across multiple cells and provides a DCI format size that is substantially a proportional multiple of the size of a DCI format that schedules PUSCH transmissions from the UE across a single cell.

[0121] Furthermore, embodiments of this disclosure consider that when a UE is configured to monitor PDCCH to detect only the DCI format of PDSCH reception or PUSCH transmission scheduled on multiple cells, it is necessary to determine the total number of PDCCH candidates and the total number of non-overlapping CCEs.

[0122] Therefore, embodiments of this disclosure relate to designing a DCI format for scheduling UE PDSCH reception across multiple cells, and providing a DCI format size that is substantially a multiple of the size of a DCI format for scheduling UE PDSCH reception across a single cell. This disclosure also relates to designing a DCI format for scheduling UE PUSCH transmission across multiple cells, and providing a DCI format size that is substantially a multiple of the size of a DCI format for scheduling UE PUSCH transmission across a single cell. This disclosure further relates to determining the total number of PDCCH candidates and the total number of non-overlapping CCEs when the UE is configured to monitor PDCCH to detect DCI formats for scheduling PDSCH reception or PUSCH transmission only across multiple cells.

[0123] The embodiments of this disclosure describe the DCI format for a UE to schedule multiple PDSCH receptions on corresponding multiple cells. The following examples and embodiments describe the design of a UE to schedule multiple PDSCH receptions on corresponding multiple cells.

[0124] The embodiments of this disclosure consider the design of a DCI format for scheduling multiple PDSCH receptions of a UE across multiple corresponding cells. For simplicity, this DCI format is referred to as DCI format 1_3. The exemplary embodiment considers scheduling two PDSCH receptions on two corresponding DL cells, but can be directly applied to any number of scheduled cells.

[0125] Because different cells may have different operating characteristics, such as different operating bandwidths or different duplexing methods (such as frequency division duplex (FDD) or time division duplex (TDD)), and because the UE may experience different channel conditions, such as different signal-to-interference-to-noise ratios (SINR), it is necessary to configure the size of each field in DCI format 1_3 separately for each cell.

[0126] DCI format 1_3 may include fields that are the same as or similar to those in DCI format 1_2. The possibility of additional fields can be considered separately. The configuration of the number of bits for each field can be independent of each scheduled cell. The limitation of this approach is that the total size of DCI format 1_3 can be large when PDSCH reception can be scheduled on any combination of cells.

[0127] For example, if (i) DCI format 1_3 is restricted to scheduling PDSCH reception on two cells, (ii) for the scheduled cells, the UE is configured with four scheduled cells, indexed as {c0, c1, c2, c3}, and (iii) the total size of the fields in DCI format 1_3 corresponding to scheduled PDSCH reception on each of the {c0, c1, c2, c3} cells is {s0, s1, s2, s3}, then DCI format 1_3 can have any combination of sizes including the sum of two values ​​from {s0, s1, s2, s3} (excluding CRC bits). For the current example of four scheduled cells with four separate total sizes for the fields in DCI format 1_3, the maximum number of different sizes for DCI format 1_3 is six.

[0128] To minimize the increase in the number of DCI formats with CRC scrambled by C-RNTI that the UE is configured to decode, the size of DCI format 1_3 can be the same regardless of the cell on which DCI format 1_3 schedules PDSCH reception. For example, the number of scheduled cells on which DCI format 1_3 can schedule PDSCH reception can be predetermined, such as two cells. The size of DCI format 1_3 can be configured by a higher layer, and it can be assumed that the sum of the sizes of the first field and the second field associated with scheduling PDSCH reception on the first cell and the second cell, respectively, is equal to the size of DCI format 1_3 (using padding bits if the sum is less than the total size).

[0129] Instead of configuring the size of DCI format 1_3 via explicit RRC signaling, the UE can determine the size of DCI format 1_3 based on the sum of the sizes of the first and second fields corresponding to scheduling two PDSCH receptions on the respective two reference cells. For example, the two reference cells could be the scheduling cell and another scheduled cell with the smallest index among the remaining scheduled cells, or the cell that results in the maximum sum of the sizes of the corresponding first and second fields in DCI format 1_3. Alternatively, the UE can expect the total size of DCI format 1_3 to be the same for scheduling two PDSCH receptions on any combination of the two scheduled cells in the set of scheduled cells.

[0130] For example, when a UE is configured with four scheduled cells and corresponding scheduling cells, where the indices of the scheduled cells are 0, 1, 2, and 3, and where a scheduling cell has an index of 1, the UE determines the size of DCI format 1_3 based on the sum of the field size used to schedule PDSCH reception on the cell with index 1 and the field size used to schedule PDSCH reception on the cell with index 0. For example, the UE can expect that the sum of the first and second field sizes used to schedule corresponding first and second PDSCH receptions on two cells is the same for any two cells in the four scheduled cell set.

[0131] Figure 10 An example method is shown for a UE, according to an embodiment of the present disclosure, to determine the size of DCI format 1_3 for scheduling two PDSCH receptions on corresponding two cells. For example, the steps of method 1000 can be performed by... Figure 1 UE 111-116 (such as Figure 3 UE 116) can be executed by any of them. Figure 10 Method 1000 is for illustrative purposes only, and other embodiments may be used without departing from the scope of this disclosure.

[0132] like Figure 10 As shown, method 1000 describes a UE (such as UE 116) receiving a configuration for a scheduling cell and a set of scheduled cells (step 1010). In step 1020, the UE receives a configuration for a search space set for monitoring PDCCH, wherein the search space set configuration includes DCI format 1_3, and wherein DCI format 1_3 schedules two PDSCH receptions on two corresponding cells in the set of scheduled cells.

[0133] In step 1030, for each cell in the scheduled cell set, the UE receives a configuration of the size of each field in a first field subset, wherein the first field subset comes from a predetermined set of fields in DCI format 1_3 associated with scheduling PDSCH reception on cells in the scheduled cell set. The fields in the first field subset are included twice in DCI format 1_3, wherein a first timing is associated with scheduling a first PDSCH reception on a first cell in the scheduled cell set, and a second timing is associated with scheduling a second PDSCH reception on a second cell in the scheduled cell set.

[0134] In step 1040, the UE also receives a configuration for the size of each field of a second subset of fields in a predetermined set of fields, wherein the second subset of fields is typically used to schedule the first PDSCH reception and the second PDSCH reception on the corresponding first and second cells of the set of scheduled cells.

[0135] In some embodiments, the fields in DCI formats 1_3 can be arranged in ascending order of the index of the scheduled cell, where the DCI format schedules the corresponding PDSCH reception. For example, if the DCI format includes the fields {f0, f1, ..., f...} M Therefore, DCI format 1_3 can include two such field blocks. In this example, the first block of scheduled cells with smaller indexes is followed by the second block of scheduled cells with larger indexes. Alternatively, the fields can be interleaved among scheduled cells in ascending order of cell indexes, and DCI format 1_3 could include two fields f0 first, followed by two fields f1, and so on up to two fields f2. M The same arrangement can be applied to fields in DCI format 0_3.

[0136] In some embodiments, if DCI format 1_3 can schedule the PDSCH reception of a non-predetermined scheduled cell, such as, for example, a scheduled cell and a predetermined scheduled cell, then DCI format 1_3 needs to include a field indicating the scheduled cell pair. When the UE can... When any cell in a scheduled cell receives a scheduled PDSCH, in DCI format 1_3 The number of bits can indicate the scheduled cell pair. Therefore, instead of the per-cell carrier indicator field, DCI format 1_3 can include A dual-carrier indicator field of 1 bit. The dual-carrier indicator field may be located first in DCI format 1_3 (possibly only after the "Identifier of DCI Format" field of a predetermined size) to allow the UE to explicitly determine the position of the field in DCI format 1_3. DCI format 1_3 may also include a bitmap to indicate... Two cells out of a total of [number] cells are scheduled. The above description can be directly applied to the largest [number] cells. One dispatched cell.

[0137] In the example below, refer to the fields of DCI format 1_2 as described in Table 1 above. This can be targeted at... Each scheduled cell in the cell is individually configured with a DL BWP indicator field size. For example, for the first scheduled cell, the DL BWP indicator field can have a 2-bit size, and for the second scheduled cell, the DL BWP indicator field can have a 0-bit size. Alternatively, when both scheduled cells have non-zero sizes for the DL BWP indicator field, DCI format 1_3 can include a single field with values ​​applicable to both scheduled cells. For example, if the first scheduled cell has 4 configured DL BWPs and the second scheduled cell has 2 configured BWPs, and the DL BWP indicator field includes 2 bits, then the value of the DL BWP indicator field indicates one of the four DL BWPs of the first scheduled cell, and the value of the DL BWP indicator field modulo 2 indicates one of the two DL BWPs of the second scheduled cell. For example, linking DL BWPs for PDSCH reception on scheduled cells is suitable because a large or small number of TBs are typically scheduled on two cells. Therefore, when a BWP change is required, the corresponding reason does not depend on a specific cell and applies to all cells.

[0138] Can target Each scheduled cell in a cell is individually configured with the following fields: Time Domain Resource Allocation (TDRA), PRB Bundle Size Indicator, Rate Matching Indicator, ZP CSI-RS Trigger, VRB-to-PRB Mapping, Antenna Port, SRS Request, DMRS Sequence Initialization, Transmission Configuration Indicator, and CBGTI or CBGFI.

[0139] The dimensions of the counter DAI field, total DAI field, TPC command field, PUCCH resource indicator field, or PDSCH to HARQ acknowledgment timing field can be targeted. Each scheduled cell in a given cell is configured individually, or can be targeted at... At least some of the cells in the cluster are the same. In the latter case, the corresponding fields can be common to the scheduled cells, and the corresponding configuration can be common to all scheduled cells.

[0140] The size of the Modulation and Coding Scheme (MCS) field can be configured individually for each scheduled cell or set to 5 bits. When the MCS field is configured individually for each scheduled cell, to reduce the increase in DCI format 1_3 payload relative to the DCI format payload scheduled for PDSCH reception on a single cell, the MCS field value of the second scheduled cell can indicate the difference (differential value) between the MCS field values ​​of the first scheduled cell and the first scheduled cell. For example, when the first MCS field of the first scheduled cell has 5 bits indicating one of the 32 entries in the MCS table, the second MCS field of the second scheduled cell can be configured to have B < 5 bits, where the first 2... B-1 The value indicates the offset (negative offset) of the MCS value lower than the MCS value indicated by the first MCS field, 2 B-1 The +1 value indicates the same MCS value (zero offset) as indicated by the first MCS field, and the latter 2 B-1 The -1 value indicates the offset (positive offset) of the MCS value that is larger than the MCS value indicated by the first MCS field. Therefore, when B=0 for the scheduled cell, the MCS for PDSCH reception on the scheduled cell is determined based on the MCS field value of the first scheduled cell, and when B=0 for all scheduled cells, the MCS field value is common to all scheduled cells.

[0141] Can target Each scheduled cell in the cell has its RV field or HARQ process number field size configured individually. The NDI field size can be configured individually for each scheduled cell or set to 1 bit. If the PDSCH transmission on the scheduled cell is configured to have 2 TBs, the RV field, HARQ process number field, and NDI field are repeated for the second TB with the same number of bits as the first TB.

[0142] In some embodiments, DCI format 1_3 may be used only for scheduling initial TB transmissions (the DCI format for scheduling a single PDSCH reception can be used for TB retransmissions), and then the NDI and RV fields may have 0 bits in DCI format 1_3 (i.e., not present). To further reduce the increase in DCI format 1_3 payload compared to scheduling PDSCH reception on a single cell, the use of DCI format 1_3 can be restricted to scheduling PDSCH reception for the same HARQ process on two cells, and then DCI format 1_3 may include only a HARQ process number field.

[0143] Can target Each scheduled cell in a given cell has its FDRA field size configured individually, as the active DL BWP size can differ between scheduled cells. CA operations target large data rates, therefore the bandwidth used for the corresponding PDSCH reception on the scheduled cell is typically large. Since the FDRA field usually requires the largest number of bits among all fields of the DCI format for scheduling PDSCH reception, it is advantageous to determine the number of bits for the FDRA field of DCI format 1_3 using an RB group (RBG) size larger than the number of bits determined for the FDRA field of a single PDSCH reception DCI format on a scheduled cell. For example, for an active DL BWP with 96 RBs, the RBG size could be 8 RBs for a DCI format for scheduling a single PDSCH reception on the corresponding cell, resulting in a 12-bit FDRA field in the RBG bitmap, while for DCI format 1_3, the RBG size could be 16 RBs, resulting in a 6-bit FDRA field in the RBG bitmap.

[0144] In some embodiments, the RBG size is predetermined according to the range of DL BWP sizes. For example, for DL ​​BWP sizes between 50 and 100 RBs, the RBG size can be 8 RBs, or the RBG size of the active DL BWP can be provided to the UE via UE-specific RRC signaling, which is used individually for DCI formats (at least for DCI formats scheduled for PDSCH reception or two PDSCH receptions) or jointly for all DCI formats. In the latter case, the RBG size used to interpret the FDRA field can be derived individually for DCI formats 1-3 by scaling the indicated RBG size by a predetermined factor (such as 2), or by a factor provided to the UE via UE-specific RRC signaling. The RBG size (number of RBs) indicated by the FDRA field in the DCI format can be used as a reference cell, such as a cell providing PDSCH reception in the DCI format.

[0145] Figure 11 An example method 1100 is shown for a UE, according to an embodiment of the present disclosure, to determine the MCS received by a second PDSCH scheduled by DCI format 1_3, which is scheduled to be received by two PDSCHs on corresponding two cells. For example, the steps of method 1100 can be performed by... Figure 1 UE 111-116 (such as Figure 3 Execute any of the UE116). Figure 11 Method 1100 is for illustrative purposes only, and other embodiments may be used without departing from the scope of this disclosure.

[0146] like Figure 11As shown, step 1110 describes the UE receiving configurations for the scheduling cell and the set of scheduled cells. In step 1120, the UE receives configurations for the search space set used to monitor the PDCCH. The search space set configuration includes scheduling two PDCCH receptions of DCI format 1_3 on two corresponding cells in the set of scheduled cells.

[0147] In step 1130, the UE receives a configuration for the size of the second MCS field in DCI format 1_3, wherein the value of the second MCS field is an offset from the value of the first MCS field in DCI format 1_3. In step 1140, the UE determines the MCS for second PDSCH reception based on an index in the MCS table, wherein the index is determined based on the sum of the value of the first MCS field and the offset.

[0148] Figure 12 An example method 1200, according to an embodiment of the present disclosure, illustrates how a UE determines the frequency domain resource allocation for PDSCH reception based on the DCI format used to schedule PDSCH reception. For example, the steps of method 1200 may be performed by… Figure 1 UE 111-116 (such as Figure 3 UE 116) can be executed by any of them. Figure 12 Method 1200 is for illustrative purposes only, and other embodiments may be used without departing from the scope of this disclosure.

[0149] like Figure 12 As shown, step 1210 describes the UE receiving (or determining) configurations for the first RBG size and the second RBG size. In step 1220, the UE detects the DCI format for scheduling PDSCH reception.

[0150] In step 1230, the UE determines whether the DCI format is a first DCI format (or whether the DCI format is a second DCI format). In response to determining that the DCI format is a second DCI format, the UE determines the FDRA field size in the DCI format based on the second RBG size in step 1240. Alternatively, in response to determining that the DCI format is a first DCI format, the UE determines the FDRA field size in the DCI format based on the first RBG size in step 1250.

[0151] To determine the position of the HARQ-ACK information bits in the HARQ-ACK codebook in response to the decoding of the TB provided in the two PDSCH receptions scheduled on the two corresponding cells in DCI format 1_3 detected by the UE during PDCCH monitoring, the value of the counter DAI(C-DAI) field in DCI format 1_3 is determined by the decoding of the TB provided in the two PDSCH receptions on the two corresponding cells. Instead of incrementing by 1 as in the case of scheduling a single PDSCH reception in DCI format, the position of the corresponding HARQ-ACK information bit in the HARQ-ACK codebook for the PDSCH reception on cell c is increased by 2. The C-DAI value, and the cell indices {c+1, ..., c1} can be cyclically shifted so that the HARQ-ACK information for the cell with index c1 is placed after the HARQ-ACK information for the cell with index c. This is described in the syntax (1) below. In syntax (1), and It is the number of bits in the C-DAI field.

[0152] Grammar (1)

[0153] If the PDSCH on cell c is also scheduled by the DCI format of the PDSCH on cell c1 (where c1 > c),

[0154]

[0155] In some embodiments, the size of the counter DAI field (or total DAI field) in DCI format 1_3 can be larger than the size of the counter DAI field in the DCI format for scheduling a single PDSCH reception, for example, by one bit in the case of two scheduled cells. One reason is to provide the same level of protection against loss detection for DCI format 1_3, since the counter DAI value in DCI format 1_3 increases by 2 instead of 1 in the case of two scheduled cells. Generally, for the configurable number of bits of the counter DCI field in the DCI format for PDSCH reception that can be scheduled on more than one cell, the maximum number of bits can be greater than the maximum number of bits of the counter DAI field in the DCI format for PDSCH reception that is scheduled on only one cell. The same approach can be applied to the total DAI field.

[0156] Figure 13 Figure 1300 illustrates the DAI values ​​in a DCI format for scheduling two PDSCH receptions on two corresponding cells and another DCI format 1_3 for scheduling PDSCH receptions on one cell, according to an embodiment of the present disclosure.

[0157] As described in Figure 1300, in a PDCCH monitoring scenario, the UE (such as UE 116) detects a PDSCH reception on scheduling cell 0 and a first DCI format including a counter DAI field 1310 with a value of 1. The UE also detects PDSCH reception on scheduling cell 11320 and PDSCH reception on cell 3 1330, including a DCI format 1_3 with a counter DAI field having a value of 3. The UE also detects the DCI format of PDSCH reception on scheduling cell 3 1340. In order to report HARQ-ACK information in the HARQ-ACK codebook, the UE places a first HARQ-ACK message 1350 in response to a PDSCH reception on cell 0, followed by HARQ-ACK message 1360 in response to a PDSCH reception on cell 1, HARQ-ACK message 1370 in response to a PDSCH reception on cell 3, and HARQ-ACK message 1380 in response to a PDSCH reception on cell 2. The serving cell indexes are rearranged to place the corresponding HARQ-ACK information in the HARQ-ACK codebook.

[0158] In some embodiments, DCI format 1_3 is also used to schedule a single PDSCH. This can be achieved by including a 1-bit field in DCI format 1_3 indicating the scheduling of one PDSCH reception (e.g., a value of "0") or the scheduling of two PDSCH receptions (e.g., a value of "1"). In the case of a single PDSCH reception, the UE may ignore the field associated with the second PDSCH reception. Alternatively, the UE may reinterpret bits of the field associated with the second PDSCH reception (at least bits separate from the field associated with the first PDSCH reception) as a subset of bits of the corresponding field associated with the first PDSCH reception to increase the size of some or all such fields to a maximum predetermined size, and thus increase the configurability / flexibility of scheduling the first PDSCH reception.

[0159] although Figure 10 , Figure 11 and Figure 12 Methods 1000, 1100, and 1200 are shown, but it is possible to... Figure 10 , Figure 11 and Figure 12 Make various changes. For example, although Figure 10 Method 1000 Figure 11 Method 1100 and Figure 12 Method 1200 is shown as a series of steps, but these steps may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps may be omitted or replaced by other steps. For example, the steps of method 1000 may be executed in different orders.

[0160] Embodiments of this disclosure describe a DCI format for scheduling multiple PUSCH transmissions from a UE across multiple corresponding cells. The following examples and embodiments describe a DCI format designed for scheduling multiple PUSCH transmissions from a UE across multiple corresponding cells.

[0161] Embodiments of this disclosure also consider a design for scheduling multiple PUSCH transmissions from a UE in a DCI format across corresponding multiple cells. For simplicity, this DCI format is referred to as DCI format 0_3, and exemplary embodiments consider scheduling two PUSCH transmissions across two corresponding DL cells.

[0162] Because different cells may have different operating characteristics, such as different operating bandwidths or different duplexing methods (such as FDD or TDD), and because UEs may experience different channel conditions, such as different signal-to-interference-to-noise ratios (SINR), the size of each field in DCI format 0_3 is configured individually for each cell.

[0163] For DCI format 0_3, which schedules PUSCH transmissions across multiple cells, the same design principles apply to all fields also present in DCI format 1_3. For example, the MCS field in a DCI format that schedules multiple PUSCH transmissions across multiple scheduled cells can be applied to all multiple PUSCH transmissions, or to PUSCH transmissions on the first scheduled cell, and the additional B-bit MCS field can be applied to the remaining scheduled cells. For brevity, the corresponding descriptions are omitted, and the remaining descriptions pertain to fields present in DCI format 0_3 but not in DCI format 1_3.

[0164] Referring to the DCI format 0_2 field in Table 2 above, we can target... Each scheduled cell in the UE is individually configured with the following dimensions: SUL indicator field, FH tag field, TPC command field, SRI field, precoding information and layer digital segment, antenna port field, PTRS-DMRS association field, DMRS sequence initialization field, or OLPC parameter set indicator field. In the absence of a TPC command field size associated with scheduling a second PUSCH transmission, e.g., for in-band CA where similar channel fading conditions apply to PUSCH transmissions on both cells, the UE applies the same TPC command provided by a single TPC command field in DCI format 0_3 to determine the power of the first and second PUSCH transmissions on the corresponding first and second cells.

[0165] In some embodiments, the DAI field, CSI request field, beta_offset indicator field, or UL-SCH indicator field can be targeted at... Each scheduled cell in the cell may be configured individually, or may be the same for at least some of the cells. In the latter case, these fields may be common to the scheduled cells and not configured for each scheduled cell, or may be configured only for the first cell. The applicability of the DAI, CSI request, beta_offset indicator, or UL-SCH indicator fields may apply only to one of the two PUSCHs, and that one PUSCH may be the same for all these fields. That one PUSCH may be a PUSCH sent on the cell with the smallest or largest index between the two cells, or a PUSCH sent on the scheduled cell (if any), or a PUSCH sent on the cell explicitly determined based on the additional 1-bit field in DCI format 0_3, or a PUSCH sent on a cell such as, for example, based on the amount of available resources for the MCS used for UCI multiplexing or PUSCH transmission, and then the UE selects the PUSCH with the larger corresponding value.

[0166] Otherwise, if the number of DCI formats with CRC scrambled by C-RNTI that the UE is configured to monitor is greater than 3, the UE can expect the size of DCI format 0_3 to be the same as the size of DCI format 1_3.

[0167] Figure 14 An example method 1400 is shown, according to an embodiment of the present disclosure, in which a UE determines the first power and the second power of the corresponding first PUSCH and second PUSCH transmitted in the corresponding first cell and second cell according to the DCI format. Figure 15 An example method is shown according to embodiments of the present disclosure, in which a UE multiplexes UCI in a PUSCH transmission in response to detecting a DCI format that schedules two PUSCH transmissions on two corresponding cells. For example, the steps of method 1400 and method 1500 can be... Figure 1 UE 111-116 (such as Figure 3 UE 116) can be executed by any of them. Figure 14 Method 1400 and Figure 15 Method 1500 is for illustrative purposes only, and other embodiments may be used without departing from the scope of this disclosure.

[0168] like Figure 14As shown, step 1410 describes the UE receiving configurations for the scheduling cell and the set of scheduled cells. In step 1420, the UE receives configurations for a search space set used to monitor the PDCCH, wherein the search space set configuration includes DCI format 0_3. DCI format 0_3 schedules two PUSCH transmissions on two corresponding cells in the set of scheduled cells. In step 1430, the UE receives the value of a TPC command via the TPC command field in DCI format 0_3. In step 1440, the UE determines a first power for the first PUSCH transmission on the first cell and a second power for the second PUSCH transmission on the second cell based on the value of the TPC command.

[0169] like Figure 15 As shown, step 1510 describes the UE receiving configurations for the scheduling cell and the set of scheduled cells. In step 1520, the UE receives configurations for a search space set used to monitor the PDCCH, wherein the search space set configuration includes DCI format 0_3, and wherein DCI format 0_3 schedules two PUSCH transmissions on two corresponding cells in the set of scheduled cells.

[0170] In step 1530, the UE determines, based on the information provided by the values ​​of one or more individual fields of the DAI, CSI request, beta_offset indicator, or UL-SCH indicator in DCI format 0_3, whether it is to multiplex UCI (such as HARQ-ACK information or CSI report) and associated parameters for UCI multiplexing in one of the two PUSCH transmissions.

[0171] In step 1540, the UE multiplexes the UCI in PUSCH transmission on a cell with a smaller index or in PUSCH transmission indicated by the additional binary field in DCI format 0_3.

[0172] although Figure 14 and Figure 15 Methods 1400 and 1500 are shown, but it is possible to... Figure 14 and Figure 15 Make various changes. For example, although Figure 14 Method 1400 and Figure 15 Method 1500 is shown as a series of steps, but these steps may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps may be omitted or replaced by other steps. For example, the steps of method 1400 may be executed in different orders.

[0173] Embodiments of this disclosure describe PDCCH monitoring capabilities for cells. The following examples and embodiments describe the scheduling of UEs via DCI format 0_3 or DCI format 1_3.

[0174] Embodiments of this disclosure also consider the determination of the total number of PDCCH candidates and the total number of non-overlapping CCEs when the UE is configured to monitor the PDCCH to detect DCI format 0_3 only or DCI format 1_3 only, thereby scheduling on a subset of scheduled cells of the set of scheduled cells.

[0175] In some embodiments, the partitioning of the UE's PDCCH monitoring capability between cells where the UE is configured with at least one search space set for monitoring PDCCH, thereby detecting the scheduling of a single PDSCH reception or a single PUSCH transmission in DCI format, and cells where the UE is configured only with a search space set for monitoring PDCCH, thereby detecting the division of the UE's PDCCH monitoring capability between DCI format 0_3 or DCI format 1_3, is considered in exemplary embodiments. Exemplary embodiments consider two cells, but when DCI format 0_3 or DCI format 1_3 can schedule a maximum of The same determination applies when a cell is being dispatched.

[0176] For example, a UE (such as UE 116) can be configured The first set of serving cells. In this example, UE(i) is either not provided with CORESETPoolIndex or is provided with CORESETPoolIndex (which is the first set of cells). (ii) Each serving cell has a single value for all CORESETs on all DL BWPs, and at least one search space set is used to monitor the PDCCH for For each cell in the first set of cells, the DCI format for scheduling a single PDSCH reception or a single PUSCH transmission is detected and scheduled. The UE can also configure... The second set of serving cells. Here, UE(i) is either not provided with CORESETPoolIndex or is provided with CORESETPoolIndex (which is the first set of cells). (ii) All CORESETs on all DL BWPs of each cell in the dataset have a single value, and (ii) all search space sets are used to monitor the PDCCH to detect only those cells in the dataset. The UE can also configure two PDSCH receptions or two PUSCH transmissions in DCI format on two corresponding cells in the second set of cells. The third set of serving cells. Here, UE(i) is provided with CORESETPoolIndex (which is for... The first CORESET on any DL BWP of each cell in the second set of cells has a value of 0 for (ii) at least one search space set is used to monitor the PDCCH for the second CORESET on any DL BWP of each cell in the second set of cells, which has a value of 1. For each cell in the first set of cells, the DCI format for scheduling a single PDSCH reception or a single PUSCH transmission is detected and scheduled. The UE can also configure... Another set of serving cells. Here, UE(i) is provided with CORESETPoolIndex (which is for... The first CORESET on any DL BWP of each cell in the second set of cells has a value of 0 for The second CORESET on any DL BWP of each cell in the second set of cells has a value of 1), and (ii) all search space sets are used to monitor the PDCCH to detect only those cells in the second set of cells. Two PDSCH receptions or two PUSCH transmissions are scheduled on two corresponding cells within a given cell in DCI format. In these examples, and No UE monitoring is required beyond the expressions described in equations (2) or (3). Specifically, equation (2) is used for PDCCH candidates, while equation (3) is used for... Non-overlapping CCEs for each time slot on the active DL BWP of the scheduling cell in each downlink cell.

[0177]

[0178]

[0179] In response to and In the above expressions of equations (2) and (3), it can also be achieved by including Each community and Considering each community might be more... and The value is slightly larger, and equation (4) or equation (5) is determined. Specifically, equation (4) is used for PDCCH candidates, while equation (5) is used for... Non-overlapping CCEs for each time slot on the active DL BWP of the scheduling cell in each downlink cell.

[0180]

[0181]

[0182] In some embodiments, the UE evaluates, based on the corresponding configured search space set, whether the number of configured PDCCH candidates exceeds the limit for non-overlapping CCEs or the limit for the number of PDCCH candidates the UE expects to monitor in a time slot (also known as the blind decoding (BD) limit). When the UE is configured to monitor PDCCHs based on a combination (X, Y), where X is the number of symbols between the first symbols in a series of consecutive PDCCH monitoring moments separated by more than Y symbols of a defined span, the UE may perform the previous evaluation only for the first span of each time slot. As described in syntax (2) below, the UE discards PDCCH monitoring for all search space sets whose index is greater than or equal to the index of the search space set where the UE reaches the limit for the number of non-overlapping CCEs or the limit for the number of PDCCH candidates the UE can monitor in a time slot (or the first span of a time slot).

[0183] Grammar (2)

[0184] V CCE (S uss (j) represents the search space set The set of non-overlapping CCEs, C(V CCE (S uss (j))) indicates that the assigned PDCCH candidates for monitoring CSS and the set of all search spaces for monitoring are taken into account. The V of the non-overlapping CCE of the search space set determined by the assigned PDCCH candidates for 0≤k≤j. CCE (S uss The cardinality of (j)).

[0185]

[0186] Therefore, embodiments of this disclosure relate to monitoring blind PDCCH decoding in a time slot or span by scaling the allocation or discarding of PDCCH candidates. This disclosure also relates to a search space set switching requested by the UE for PDCCH monitoring. This disclosure further relates to PDCCH allocation or discarding based on a predetermined CCE AL order for blind PDCCH decoding in a time slot or span.

[0187] In some embodiments, as previously described, when a UE (such as UE 116) is configured to monitor more non-overlapping CCEs or PDCCH candidates scheduled on the cell in a time slot than the corresponding UE PDCCH monitoring capability in the cell's time slot, the UE skips PDCCH monitoring for all search space (SS) sets whose search space set IDs are greater than or equal to the search space IDs that have reached the corresponding limits. Thus, PDCCH candidate dropping at the granularity of search space sets is coarse and results in more PDCCH candidates being dropped than necessary. For example, when, after assigning PDCCH candidates and non-overlapping CCEs to the search space set with the first index, the number of remaining PDCCH candidates is 5, and the number configured for the search space set with the next index is 6, the UE abandons PDCCH monitoring for all remaining PDCCH candidates, even though the corresponding capability would only be exceeded by one PDCCH candidate. Inefficient PDCCH dropping rules can lead to unnecessary PDCCH congestion due to the unnecessary reduction of PDCCH candidates. This problem may be more severe for intermediate tier UEs (RedCap UEs) that typically require cost reduction and therefore have reduced capabilities, because the percentage of unnecessary PDCCH candidates dropped relative to the total number of PDCCH candidates may be greater than for UEs with greater PDCCH monitoring capabilities.

[0188] Besides unnecessary PDCCH candidate dropping, when multiple beams are used and PDCCHs can be configured to be received in control resource sets (CORESETs) with different Transmission Configuration Indicator (TCI) states corresponding to different PDCCH transmission beams via different Quasi-Co-location (QCL) attributes, dropping PDCCHs for each search space set can reduce the reliability of PDCCH reception. For example, a search space set might be associated with a CORESET having a QCL assumption indicating the directional beam used for reception. When PDCCH dropping is applied to the entire search space set, search space sets corresponding to CORESETs with different beam directions or QCL assumptions might be dropped for some beam directions.

[0189] When discarding PDCCH candidates to satisfy the UE monitoring capability of each time slot and each scheduled cell for the corresponding subcarrier spacing (SCS) configuration for the scheduled cell, it may be beneficial for the UE to discard candidates that are unlikely to be used for scheduling UE PDSCH reception or PUSCH transmission from the UE. For example, since the serving gNB (such as BS 102) configures a search space set for the UE (such as UE 116) based on RRC signaling, and RRC reconfiguration is infrequent to avoid corresponding signaling overhead, the search space set may include PDCCH candidates ranging from the smallest (such as 1 CCE) to the largest (such as 16 CCE) aggregation level of channel control elements (CCEs), thereby enabling scheduling when the UE experiences corresponding favorable or unfavorable channel conditions (such as a large signal-to-interference-noise ratio (SINR) or a low SINR). However, the gNB can use a corresponding CCE aggregation level for PDCCH transmissions, which reflects the last Reference Signal Received Power (RSRP) report or the last Channel State Information (CSI) report from the UE to the scheduling cell. The UE would then unnecessarily monitor the number of PDCCH candidates corresponding to that CCE aggregation level that are unlikely to be used by the serving gNB on the scheduling cell. Therefore, it would be beneficial for the UE to monitor PDCCHs based on a search space set reflecting the channel conditions (such as SINR) the UE is experiencing, or to avoid monitoring PDCCH candidates at CCE aggregation levels that the serving gNB is unlikely to use to schedule unicast PDSCH reception or PUSCH transmissions from the UE to the UE on the scheduling cell.

[0190] Therefore, embodiments of this disclosure take into account the need to support scaling of PDCCH candidates for PDCCH discarding. Embodiments of this disclosure also take into account the need to support UE-requested search space set switching. Furthermore, embodiments of this disclosure take into account the need to support PDCCH discarding based on a predetermined CCE AL order.

[0191] Therefore, when a UE is configured to monitor PDCCH based on a combination (X, Y), where X is the number of symbols between the first few symbols in a continuous PDCCH monitoring time segment separated by more than Y symbols of a defined span, and where Y is greater than a time slot, the UE may, according to any method defined in this disclosure, evaluate whether the number of configured PDCCH candidates exceeds the limit for non-overlapping CCEs or the limit for the number of PDCCH candidates for that span only.

[0192] Embodiments of this disclosure describe scaling PDCCH candidates for PDCCH dropping. The following examples and embodiments describe scaling PDCCH candidates for PDCCH dropping.

[0193] The embodiments of this disclosure consider the PDCCH candidate allocation process or the PDCCH candidate discarding process by scaling the number of PDCCH candidates monitored by the UE in a time slot or span.

[0194] After the UE (such as UE 116) performs the corresponding allocation based on the search space set of the CSS monitoring PDCCH, it then... and These are the remaining PDCCH candidates and the remaining non-overlapping CCEs, respectively, of the search space set of PDCCH monitored by the UE according to the USS. The UE determines the initial values ​​as described in equations (6) and (7) below.

[0195]

[0196]

[0197] V CCE (S USS (j) represents the search space set S USS (j) is the set of non-overlapping CCEs, and C(V) CCE (S USS (j))) represents V CCE (S USS The cardinality of (j)). S represents the search space set S of the CCE aggregation levels (AL) of L CCEs. USS (j) The number of configured PDCCH candidates.

[0198] In the first approach, a process for scaling multiple PDCCH candidates is used. The UE applies a scaling of the number of PDCCH candidates across all configured USS sets. The UE determines the assigned PDCCH candidates for K configured USS sets in a cumulative manner based on the PDCCH candidate allocation or discard rules, as described in syntax (3) below.

[0199] Grammar (3)

[0200]

[0201] As described in grammar (3), X and X step These are the cumulative scaling factor and the scaling per step, respectively. X step It can be provided to the UE via higher-level signaling or predefined in the system operation specifications. For example, X step =0.25.

[0202] In some embodiments, this process first checks whether any scaling is needed, rather than starting from X0 and incrementing the PDCCH candidate assignment score by X. stepIf a scaling factor is required, this process reduces the number of PDCCH candidates in the USS's search space set by / scaling factor X. step Determine whether reduced / scaled PDCCH candidates can be assigned, and if so, stop the process, or scale the number of PDCCH candidates on the USS's search space set (again) by the scaling factor X. step The steps begin to repeat this process. PDCCH allocation is described in the corresponding syntax (4) below.

[0203] Grammar (4)

[0204]

[0205] As described in grammar (4), X step It is the update step size for the scaling factor 0 < X ​​≤ 1. step It can be provided to the UE via higher-level signaling, or it can be predefined in the system operation specifications. For example, X step =0.25.

[0206] Figure 16 , Figure 17 and Figure 18 Example methods 1600, 1700, and 1800, according to embodiments of the present disclosure, are shown for a UE to determine the number of PDCCH candidates to be monitored in a time slot in order to schedule PDCCH candidate scaling on a cell. For example, the steps of method 1500 can be performed by... Figure 1 UE 111-116 (such as Figure 3 The methods 1600, 1700, and 1800 are for illustrative purposes only, and other embodiments may be used without departing from the scope of this disclosure.

[0207] like Figure 16 As shown, step 1602 describes the configuration of the UE being provided with K USS sets and the update step size X. step The scaling factor. In step 1604, for a time slot or span, the UE sets the value of the scaling factor X to Xstep, j = 0. In step 1606, the UE determines whether (i) X ≤ 1, (ii) ... and (iii)

[0208] If any of the three conditions are not met, the UE considers the PDCCH allocation process to be over in step 409, and the UE decodes the allocated PDCCH candidates in the time slot or span.

[0209] Upon determining that all three conditions are met, the UE allocates (additional) monitoring data to the USS set in step 1608. There are 16 PDCCH candidates. Then, in step 1610, the UE updates the remaining PDCCH candidates and non-overlapping CCEs as described in equations (8) and (9) below. In step 1612, the UE updates the USS set index as described in equation (10) below. In step 407, the UE determines whether J is equal to zero. When the UE determines that J is not equal to zero, the UE returns to step 403. Alternatively, when the UE determines that j is equal to zero, then in step 408, the UE updates the scaling factor as described in equation (11). After updating the scaling factor, the UE returns to step 403.

[0210]

[0211]

[0212] j = mod(j+1, K) (10)

[0213] X = X + X step (11)

[0214] If any of the three conditions in step 403 are not met, the UE considers the PDCCH allocation process to be complete in step 409, and the UE decodes the PDCCH candidates allocated in the time slot or span.

[0215] For example, after the UE determines the allocation of CSS, the initial number of PDCCH candidates for USS is Furthermore, the UE has four USS sets, where {8, 16}, {8, 16}, and {8, 16} PDCCH candidates are associated with two CCE ALs (e.g., CCE ALs are 1 and 2). Therefore, for the cumulative scaling factor X = Xstep = 0.25, the UE assigns PDCCH candidate {8, 16} * 0.25 = {2, 4} to USS set 0, and the remaining PDCCH candidates... Assign {2, 4} to USS set 1, and the remaining PDCCH candidates =30-6=24; Assign {2, 4} to USS set 2, the remaining PDCCH candidates Assign {2, 4} to USS set 3, and the remaining PDCCH candidates For a cumulative scaling factor X = 0.5, the UE assigns the additional PDCCH candidates {2, 4} to USS set 0, and the remaining PDCCH candidates... Assign the additional {2, 4} to USS set 1, and the remaining PDCCH candidates because Therefore, the UE completes the PDCCH candidate allocation for the USS set. For USS set 0, USS set 1, USS set 2, and USS set 3, the obtained PDCCH candidate allocations are {4, 8}, {4, 8}, {2, 4}, and {2, 4}, respectively.

[0216] like Figure 17 As shown, step 1702 describes the configuration and scaling factor update step X of the UE being provided with K USS sets. step In step 1704, for a time slot or span, the UE sets the value of the scaling factor X to 1, j = 0. In step 1706, the UE determines whether conditions (1) j ≠ K and (2) X > 0 are satisfied.

[0217] When it is determined that at least one condition of step 1706 is not met (such as if X≤O or j=K), in step 1718, the UE considers the PDCCH candidate allocation process for the USS set to be completed, and the UE monitors the PDCCH according to the PDCCH candidates allocated in the time slot or span.

[0218] Alternatively, upon determining that the two conditions in 1706 are met, the UE initiates or continues the allocation process for PDCCH candidates for the K USS sets by applying a scaling factor X (step 1708). That is, in step 1708, the UE first sets the remaining PDCCH candidates and non-overlapping CCEs associated with the scaling factor X to... and And j = O, where and It is determined based on the UE PDCCH monitoring capability and the PDCCH candidates centrally configured in the CSS.

[0219] In step 1710, the UE determines the current USS set S USS (j), does it satisfy? and When the condition of step 1710 is met, in step 1712, the UE sends a request to the USS set S. USS (j) (Re)assign to monitoring There are 10 PDCCH candidates. In step 1714, the UE updates the remaining PDCCH candidates and non-overlapping CCEs, such that... and Subsequently, in step 1716, the UE updates the USS set index so that j = j + 1.

[0220] If none of the conditions in step 1710 are met, in step 1720, the UE ends the PDCCH candidate allocation process for the current scaling factor X and reduces the scaling factor so that X = XX. stepAfter reducing the scaling factor in step 1720, method 1700 returns to step 1706 so that the UE checks whether two conditions (j≠K and X>0) are met.

[0221] For example, after the UE determines the allocation of CSS, the initial number of PDCCH candidates for USS is Furthermore, the UE has four USS sets, where {8, 16}, {8, 16}, and {8, 16} PDCCH candidates are associated with the CCE AL of {1, 2}. For a scaling factor X = 1, the UE may only assign PDCCH candidate {8, 16} to USS set 0, with the remaining PDCCH candidates... The UE reduces X to 0.75. For a scaling factor X = 0.75, the UE can reallocate PDCCH candidates {6, 12} to USS set 0, with the remaining PDCCH candidates... And reallocate PDCCH candidates {6, 12} to USS set 1, with the remaining PDCCH candidates... The UE reduces X to 0.5. For scaling factor X = 0.5, the UE reallocates PDCCH candidates {4, 8} to USS set 0, and the remaining PDCCH candidates... Reassign PDCCH candidates {4, 8} to USS set 1, and the remaining PDCCH candidates Furthermore, PDCCH candidates {4, 8} are reassigned to USS set 2, and the remaining PDCCH candidates... The UE reduces X to 0.25. For scaling factor X = 0.25, the UE reallocates PDCCH candidates {2, 4} to USS set 0, and the remaining PDCCH candidates... Reallocate PDCCH candidates {2, 4} to USS set 1, and the remaining PDCCH candidates Reassign PDCCH candidates {2, 4} to USS set 2, and the remaining PDCCH candidates Furthermore, PDCCH candidates {2, 4} are reassigned to USS set 3, and the remaining PDCCH candidates... Finally, the UE assigned PDCCH candidates {2,4}, {2,4}, {2,4} and {2,4} to USS set 0, USS set 1, USS set 2 and USS set 3 respectively.

[0222] Another method for discarding PDCCH candidates by scaling the number of PDCCH candidates across the entire search space set, wherein the UE is configured to monitor PDCCHs based on the USS, and when the UE determines that the total number of configured PDCCH candidates for the search space set is greater than the remaining number of PDCCH candidates, the UE applies PDCCH scaling to the USS set. Instead of discarding the entire search space set, the UE allocates a portion of the PDCCH candidates to the search space set relative to the number of configured PDCCH candidates. The UE determines the allocated PDCCH candidates for the configured USS set based on the following predetermined PDCCH allocation or discard syntax (5).

[0223] Grammar (5)

[0224]

[0225] As described in syntax (5), the UE will be used for monitoring. Each PDCCH candidate is assigned to the USS set S. USS (j). Furthermore, X step This refers to the update step size for scaling factors 0 < X ​​≤ 1. step It can be provided to the UE via higher-level signaling, or it can be predefined in the system operation specifications. For example, X step =0.25.

[0226] like Figure 18 As shown, step 1802 describes the configuration of the USS set provided to the UE and the initial scaling factor update step size X. step In step 1804, for a time slot or span, the UE sets the value of the USS index to 0, i.e., j = 0. In step 1806, the UE determines the value of the current USS set S. USS (j), does it satisfy the first condition? Second condition When both conditions are met, the UE sends an update to the USS set S in step 1808. USS (j) Allocate resources for PDCCH monitoring There are 10 PDCCH candidates. In step 1810, the UE then updates the number of remaining PDCCH candidates and the number of remaining non-overlapping CCEs such that equations (12) and (13) are satisfied. Then, in step 1812, the UE increments the USS set index by 1, as described in equation (14).

[0227]

[0228]

[0229] j = j + 1 (14)

[0230] If none of the conditions in step 1806 are met, the UE assigns a USS set S to which there is currently no PDCCH candidate. USS (j) Scaling the number of PDCCH candidates configured. In step 1814, the UE sets X = 1 - X step , and In step 1816, the UE determines whether the conditions of equations (15) and (16) are satisfied.

[0231]

[0232]

[0233] In response to determining that at least one condition of step 1816 is not met, the UE updates the scaling factor in step 1818 as described in equation (17). Thereafter, method 1700 returns to step 1816.

[0234] X = XX step (17)

[0235] In response to determining that the two conditions of step 1816 are met, the UE sends an update to the USS set S in step 1820. USS (j) Assignment for monitoring One PDCCH candidate. In step 1822, the UE considers the PDCCH allocation process to be complete and monitors the PDCCH according to the PDCCH candidates allocated in the time slot or span.

[0236] For example, after the UE determines the allocation of CSS, the initial number of PDCCH candidates for USS is Furthermore, the UE has four USS sets. When {8, 16}, {8, 16}, and {8, 16} PDCCH candidates are associated with the CCE AL of {1, 2}, the UE assigns {8, 16} to USS set 0, and the remaining PDCCH candidates... Since the UE cannot allocate a configured PDCCH candidate for USS set 1, the UE then begins scaling the number of PDCCH candidates used for USS set 1. When X = 0.5, It is not greater than The UE further assigns {4, 8} PDCCH candidates to USS set 1. For the corresponding time slot or span, the UE discards USS set 2 and USS set 3 used for PDCCH monitoring.

[0237] although Figure 16 , Figure 17 and Figure 18Methods 1600, 1700, and 1800 are shown, but it is possible to... Figure 16 , Figure 17 and Figure 18 Make various changes. For example, although Figure 16 Method 1600 is shown as a series of steps, but these steps may overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps may be omitted or replaced by other steps. For example, the steps of method 1600 may be executed in different orders.

[0238] Embodiments of this disclosure also describe a UE-requested search space set switching. The following examples and embodiments describe a UE-requested search space set switching.

[0239] Embodiments of this disclosure consider switching between groups of search space sets based on a UE request. Based on this request, the serving gNB can trigger the UE to switch from one of multiple currently active search space sets to a new active search space set for PDCCH monitoring. The UE assigns PDCCH candidates to monitor the active search space set, rather than all configured search space sets within a group of search space sets.

[0240] For example, for group search space set switching, the applicable search space set group only includes the search space set in which the UE monitors the PDCCH according to the USS. In another example, the applicable search space set group includes both the search space set in which the UE monitors the PDCCH according to the USS and the search space set in which the UE monitors the PDCCH according to the CSS. In yet another example, the applicable search space set group is configured by a higher layer. In the configuration of the applicable search space set group, the associated group index of the search space set can be provided to the UE.

[0241] A UE request to switch from a first search space set to a second search space set can be based on the signal-to-interference-to-noise ratio (SINR) measured by the UE in the CORESET received by the PDCCH in the search space set, or on block error rate (BLER) statistics used to detect the DCI format provided by the PDCCH reception. Different search space sets can include a different number of PDCCH candidates for each CCE aggregation level, allowing the UE to indicate a search space set that includes more PDCCH candidates that the UE deems suitable for PDCCH reception at a given CCE aggregation level. The serving gNB receiving the request from the UE can respond by providing a corresponding group index indicating a search space set for the UE to monitor the PDCCH, where the group index may be the same as or different from the index of the current search space set used by the UE to monitor the PDCCH.

[0242] Figure 19An example method 1900 for a UE to switch between multiple sets of search spaces according to an embodiment of the present disclosure is illustrated. For example, the steps of method 1900 can be performed by... Figure 1 UE 111-116 (such as Figure 3 The method can be performed using any of the UE 116. Method 1900 is for illustrative purposes only, and other embodiments may be used without departing from the scope of this disclosure.

[0243] like Figure 19 As shown, step 1910 describes the UE reporting information to indicate a preferred set of search space sets for PDCCH monitoring. In step 1920, the UE receives an index of the set of search space sets for PDCCH monitoring. Multiple sets of search space sets are pre-configured for the UE via higher-layer signaling such as RRC signaling. In step 1930, the UE determines whether (multiple) currently active search space sets are the same as the indicated search space sets by determining whether the index of the indicated set of search space sets is the same as (or different from) the current index of the set of search space sets used for PDCCH monitoring. If (multiple) currently active search space sets are different from the indicated set of search space sets, in step 1940, the UE stops monitoring (multiple) currently active search space sets and begins monitoring the PDCCH according to (multiple) search space sets corresponding to the indicated group index. For example, PDCCH monitoring may begin Y symbols / slots after the last symbol / slot when the UE receives the PDCCH associated with the indication of the group index. Alternatively, if the (multiple) currently active search space sets are the same as the indicated (multiple) search space sets, then in step 1950, the UE continues to monitor the PDCCH according to the (multiple) currently active search space sets.

[0244] In some embodiments, the UE provides a request for a set of search spaces within a configured set of search spaces by providing a corresponding index for that set of search spaces. The group index can be indicated by log2(N) bits, where N is the number of groups of search spaces configured by the UE from a higher layer. In a first example, the UE can provide the index via a MAC control element in a PUSCH transmission. In another example, the UE can provide the index via a PUCCH transmission, where the UE can be configured with PUCCH resources, a period, and a time offset from the first slot relative to the system frame number of the PUCCH transmission. In yet another example, the PUCCH resources can be the same as those used for periodic or semi-persistent HARQ-ACK, scheduling requests, or CSI reports, and the group index indication can be multiplexed in a PUCCH transmission along with other UCI information. The period used for multiplexing the group index can be the same as or different from the period used for multiplexing other UCI reports in a PUCCH transmission.

[0245] Instead of providing explicit indications for the indices of a set of search space sets, the UE can be configured to map indices and RSRP values ​​between multiple sets of search space sets. After reporting RSRP values, and after the UE detects the same HARQ process and DCI format for scheduling the transmission of a new transport block for a PUSCH with RSRP reporting, the UE can apply the corresponding set of search space sets to PDCCH monitoring. For example, for two sets of search space sets, the UE can be configured to associate the first set with RSRP values ​​less than or equal to a configured RSRP threshold (and associate the second set with RSRP values ​​greater than that threshold).

[0246] The serving gNB (such as BS 102) can provide the UE (such as UE 116) with an index of a set of search space sets for UE monitoring the PDCCH via either the MAC control element in the PDSCH reception or a field in the DCI format in the PDCCH reception. In this example, the UE can monitor the PDCCH to detect the DCI format based on either the CSS or the USS. The group index can be indicated by log2(N) bits, where N is the number of groups of search space sets configured by the higher layer for the UE.

[0247] When a group index is provided to the UE via the MAC CE in PDSCH reception, the UE can determine the application delay for monitoring the PDCCH according to the indicated set of search spaces as Y symbols / slots after the last slot / symbol of the PUCCH in which the UE sends HARQ-ACK information in response to the PDSCH reception. When a group index is provided to the UE via the DCI format in PDCCH reception, the UE can determine the application delay for monitoring the PDCCH according to the indicated set of search spaces after Y slots / symbols after the UE receives the last slot / symbol of the PDCCH. The value of Y can be predetermined. In one example, the value of Y is provided to the UE via higher-layer signaling. In another example, the value of Y can be reported by the UE as a UE capability. In yet another example, the value of Y is defined in the system operation specification. For example, Y = 1 slot.

[0248] although Figure 19 Method 1900 is shown, but it is possible to... Figure 19 Make various changes. For example, although Figure 19 Method 1900 is shown as a series of steps, but these steps can overlap, occur in parallel, occur in different orders, or occur multiple times. In another example, steps can be omitted or replaced by other steps. For example, the steps of method 1900 can be executed in different orders.

[0249] Embodiments of this disclosure describe PDCCH discarding for each CCE AL. The following examples and embodiments describe PDCCH discarding for each CCE AL.

[0250] Embodiments of this disclosure consider scaling or discarding PDCCH candidates based on a predetermined CCE AL order within a time slot or span. A predetermined order of CCE ALs can be provided to a UE (such as UE 116) for allocating PDCCH candidates to monitor PDCCHs for a corresponding search space set. The UE determines the PDCCH candidates to be allocated to the search space set within a time slot / span based on the predetermined order of CCE ALs for each time slot / span and the PDCCH monitoring capability. The UE can be provided with a list of CCE ALs, denoted as L. BD And the pre-order of CCE AL is determined by list L BD The index i indicates the index. For example, the list could include CCE AL in the order {2, 4, 8, 1, 16}.

[0251] For example, after the UE assigns PDCCH candidates and non-overlapping CCEs to the search space set associated with PDCCH monitoring according to the CSS, let and These are the remaining PDCCH candidates and remaining non-overlapping CCEs used for the USS, respectively. The UE determines... and The initial value.

[0252] V CCE (S USS (j) represents the search space set S USS (j) is the set of non-overlapping CCEs, and C(V) CCE (S USS (j))) represents V CCE (S USS The cardinality of (j)). Let S be the search space set S under CCE AL of L. USS (j) The number of PDCCH candidates configured.

[0253] Indicates CCE ALL BD (i) Search space set S USS The set of non-overlapping CCEs of (j), and express The base number. Indicates CCE ALL BD (i) Search space set S USS (j) is a PDCCH candidate.

[0254] In the first method for PDCCH allocation based on a predetermined CCE AL order, the UE (such as UE 116) applies the predetermined CCE AL order to all available USS sets, wherein the allocated PDCCH candidates for monitoring the CSS set and the candidates for monitoring all L BD The assigned PDCCH candidates (k), 0≤k≤i, determine the CCE aggregation level L. BD (i) Search for non-overlapping CCEs in the search space set. As described in syntax (6) below, the UE determines the PDCCH candidates for the allocation of the USS set for the K configurations based on the predetermined PDCCH allocation or discard.

[0255] Grammar (6)

[0256]

[0257] In another method of PDCCH allocation based on a predetermined CCE aggregation level order, when the UE cannot allocate all configured PDCCH candidates to the search space set, the UE applies the predetermined CCE aggregation level order to the remaining search space set without performing PDCCH allocation. As described in the syntax (7) below, the UE determines the PDCCH candidates for allocation to the K USS sets based on the predetermined PDCCH allocation or discard.

[0258] Grammar (7)

[0259]

[0260] In another method for PDCCH allocation based on a predetermined CCE AL order, after the UE allocates all configured PDCCH candidates and non-overlapping CCEs to the search space set with index less than j, for the remaining PDCCH candidates and non-overlapping CCEs, the UE applies the predetermined CCE AL order only to the search space set with index j. As described in syntax (8) below, the UE determines the PDCCH candidates for allocation to the USS set based on the predetermined PDCCH allocation or discard.

[0261] Grammar (8)

[0262]

[0263] According to syntax (6), syntax (7), and syntax (8), the UE initially assigns all configured PDCCH candidates and non-overlapping CCEs to the USS set based on the traditional PDCCH allocation rules (after the UE has already assigned PDCCH candidates and non-overlapping CCEs to the CSS set). Then, the UE assigns CCE AL to the set L of the USS set according to the CCE AL. BDAssign the remaining PDCCH candidates and non-overlapping CCEs to the USS set.

[0264] To determine the set L of CCE AL BD In one example, L BD It can be provided to the UE via higher-layer signaling. In another example, L BD It can be predefined in the system operation specifications, such as L BD = [1, 2, 4, 8, 16]. In yet another example, L BD Auxiliary information can be reported from the UE to the gNB via higher-layer signaling. In yet another example, L BD It can be the preferred CCE AL or PDCCH CSI reported by the UE via PUCCH or PUSCH.

[0265] The flowcharts above illustrate example methods that can be implemented according to the principles of this disclosure, and various modifications can be made to the methods shown in the flowcharts herein. For example, although shown as a series of steps, the individual steps in each diagram can overlap, occur in parallel, occur in different orders, or occur multiple times. In other examples, steps can be omitted or replaced by other steps.

[0266] Although the accompanying drawings illustrate different examples of user equipment, various changes can be made to the drawings. For example, the user equipment can include any number of each component in any suitable arrangement. Generally, the drawings do not limit the scope of this disclosure to any particular configuration. Furthermore, although the drawings illustrate operating environments in which the various user equipment features disclosed in this patent document can be used, these features can be used in any other suitable system.

[0267] Although this disclosure has been described with reference to exemplary embodiments, various changes and modifications will be apparent to those skilled in the art. This disclosure is intended to include such 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 essential and must be included within the scope of the claims. The scope of the claimed subject matter is defined by the claims.

Claims

1. A method for receiving a physical downlink control channel (PDCCH), the method comprising: Receive information from the first group of N1 cells and the second group of N2 cells, where: PDCCH provides downlink control information (DCI) format, and The DCI format scheduler is one of the following: The Physical Downlink Shared Channel (PDSCH) is received or the Physical Uplink Shared Channel (PUSCH) is transmitted in one of the N1 cells in the first group, or PDSCH reception or PUSCH transmission on multiple cells in at most M cells of the second group of N2 cells, where M is greater than 1; The total number of PDCCH receptions in a time slot on the scheduling cell is determined based on the ratios of N1 and N2 to M; and On the scheduled cell, receive a number of PDCCHs in a time slot that is no greater than the total number.

2. The method according to claim 1, wherein: The DCI format schedules the PDSCH reception or PUSCH transmission on multiple cells in up to M cells of the second group of N2 cells, and The DCI format includes a field indicating the number of cells.

3. The method according to claim 1, wherein: The DCI format schedules the PDSCH reception or PUSCH transmission on multiple cells of the maximum M cells in the second group of N2 cells, and The size of the DCI format is the same for any number of cells.

4. The method according to claim 1, wherein: When the DCI format schedules PDSCH reception or PUSCH transmission on one of the N1 cells in the first group, the DCI format includes a counter downlink assignment index (DAI) field with a first maximum number of bits. When the DCI format schedules PDSCH reception or PUSCH transmission on multiple cells of up to M cells in the second group of N2 cells, the DCI format includes a counter DAI field with a second maximum number of bits, and The second maximum number of bits is greater than the first maximum number of bits.

5. The method according to claim 1, further comprising: Receive a second PDCCH in a second DCI format, wherein: The second DCI format schedules the transmission of the first and second PUSCH on the corresponding first and second cells in the second group of N2 cells. The first and second cells are in the same frequency band, and The second DCI format includes a Transmission Power Control (TPC) command that provides a value; Based on the aforementioned value, the first power and second power of the transmission of the first PUSCH and the second PUSCH are determined respectively; and The first PUSCH and the second PUSCH are transmitted using the first power and the second power, respectively.

6. The method according to claim 1, further comprising: Receive a second PDCCH in a second DCI format, wherein: The second DCI format schedules the transmission of the first and second PUSCH on the corresponding first and second cells in the second group of N2 cells. The first cell has a smaller index than the second cell, and The second DCI format includes the Downlink Assignment Index (DAI) field; The value of the DAI field is used to determine the Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message; and The first PUSCH and the second PUSCH are sent on the first cell and the second cell respectively, wherein the HARQ-ACK information is only included in the first PUSCH.

7. The method according to claim 1, further comprising: Receive a second PDCCH in a second DCI format, wherein: The second DCI format schedules the reception of the first PUSCH and second PDSCH on the corresponding first and second cells in the second group of N2 cells, and The second DCI format includes a Frequency Domain Resource Allocation (FDRA) field indicating a Resource Block Group (RBG), wherein the RBG includes: The first number of resource blocks (RBs) on the first cell, and The second number of RBs on the second cell; and Receive the first PDSCH and the second PDSCH on the indicated RBG.

8. A user equipment (UE), comprising: The transceiver is configured to receive information from a first group of N1 cells and a second group of N2 cells, wherein: The Physical Downlink Control Channel (PDCCH) provides the Downlink Control Information (DCI) format, and The DCI format scheduler is one of the following: The Physical Downlink Shared Channel (PDSCH) is received or the Physical Uplink Shared Channel (PUSCH) is transmitted in one of the N1 cells in the first group, or The second group of N2 cells includes PDSCH reception or PUSCH transmission on multiple cells in at most M cells, where M is greater than 1; and A processor operatively connected to the transceiver is configured to determine the total number of PDCCH receptions in a time slot on the scheduled cell based on the ratios of N1 and N2 to M. The transceiver is further configured to receive a number of PDCCHs in a time slot on a scheduled cell that is no more than the total number of PDCCHs.

9. The UE according to claim 8, wherein: The DCI format schedules the PDSCH reception or PUSCH transmission on multiple cells in up to M cells of the second group of N2 cells, and The DCI format includes a field indicating the number of cells.

10. The UE according to claim 8, wherein: The DCI format schedules the PDSCH reception or PUSCH transmission on multiple cells of the maximum M cells in the second group of N2 cells, and The size of the DCI format is the same for any number of cells.

11. The UE according to claim 8, wherein: When the DCI format schedules PDSCH reception or PUSCH transmission on one of the N1 cells in the first group, the DCI format includes a counter downlink assignment index (DAI) field with a first maximum number of bits. When the DCI format schedules PDSCH reception or PUSCH transmission on multiple cells of up to M cells in the second group of N2 cells, the DCI format includes a counter DAI field with a second maximum number of bits, and The second maximum number of bits is greater than the first maximum number of bits.

12. The UE according to claim 8, wherein: The transceiver is also configured to receive a second PDCCH providing a second DCI format, wherein: The second DCI format schedules the transmission of the first and second PUSCH on the corresponding first and second cells in the second group of N2 cells. The first and second cells are in the same frequency band, and The second DCI format includes a Transmission Power Control (TPC) command that provides a value; The processor is also configured to determine, based on the value, a first power and a second power for transmitting the first PUSCH and the second PUSCH, respectively; and The transceiver is also configured to transmit the first PUSCH and the second PUSCH using a first power and a second power, respectively.

13. The UE according to claim 8, wherein: The transceiver is also configured to receive a second PDCCH providing a second DCI format, wherein: The second DCI format schedules the transmission of the first and second PUSCH on the corresponding first and second cells in the second group of N2 cells. The first cell has a smaller index than the second cell, and The second DCI format includes the Downlink Assignment Index (DAI) field; The processor is also configured to determine the Hybrid Automatic Repeat Request Acknowledgment (HARQ-ACK) message based on the value of the DAI field; and The transceiver is also configured to transmit a first PUSCH and a second PUSCH on the first cell and the second cell, respectively, wherein the HARQ-ACK information is only included in the first PUSCH.

14. The UE of claim 8, wherein, The transceiver is also configured to receive: Provides a second PDCCH in a second DCI format, wherein: The second DCI format schedules the reception of the first PUSCH and second PDSCH on the corresponding first and second cells in the second group of N2 cells, and The second DCI format includes a Frequency Domain Resource Allocation (FDRA) field indicating a Resource Block Group (RBG), wherein the RBG includes: The first number of resource blocks (RBs) on the first cell, and The second number of RBs on the second cell; and The first PDSCH and the second PDSCH on the indicated RBG.

15. A base station, comprising: The transceiver is configured to transmit information from a first group of N1 cells and a second group of N2 cells, wherein: The Physical Downlink Control Channel (PDCCH) provides the Downlink Control Information (DCI) format, and The DCI format scheduler is one of the following: The Physical Downlink Shared Channel (PDSCH) is transmitted or the Physical Uplink Shared Channel (PUSCH) is received in one of the N1 cells in the first group, or The second group of N2 cells involves PDSCH transmission or PUSCH reception on multiple cells in at most M cells, where M is greater than 1; and A processor operably connected to the transceiver is configured to determine the total number of PDCCH transmissions in a time slot on the scheduled cell based on the ratios of N1 and N2 to M. The transceiver is further configured to transmit a number of PDCCHs no more than the total number in a time slot on a scheduling cell.

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