Determining TCI status for default indication of PDSCH reception

Abstract

Methods and apparatus for determining a default TCI state for PDSCH reception when configuring a plurality of indicated TCI states. The method includes receiving scheduling information for the PDSCH via the PDCCH DCI before a predetermined time threshold. The PDCCH DCI format includes a scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. The method also includes determining whether the UE (302) is capable of processing a single default beam in a frequency range 1 (FR1) or a frequency range 2 (FR2). The method further includes, in a case where the UE (302) can only process a single default beam in the FR2, determining, based on the two indicated TCI states, whether at least one of an intra-cell Multi-Transfer Reception Point (MTRP) multi-DCI mode and an intra-cell MTRP single DCI mode is a joint TCI mode or a separate TCI mode.

Description

Technical Field

[0001] This application is based on and benefits from the following applications: Indian Provisional Application 202341067888, filed October 10, 2023; Indian Provisional Application 202341071559, filed October 19, 2023; Indian Provisional Application 202341073875, filed October 30, 2023; Indian Provisional Application 202341085972, filed December 15, 2023; and Indian Full Application 202341067888, filed October 5, 2024, the contents of which are incorporated herein by reference. This disclosure relates to wireless communications. More specifically, this disclosure relates to a method and system for determining the default TCI state of Physical Downlink Shared Channel (PDSCH) reception in a User Equipment (UE) when multiple Transmission Configuration Indicator (TCI) states are indicated. Background Technology

[0002] Release 17 introduced a unified TCI as a way to reduce the overhead signaling of the TCI for each physical channel and reference signal (RS). It was observed that multiple physical channels follow the same TCI state across multiple time slots, making it redundant to configure a new TCI state for each channel in each time slot. Furthermore, a common type of signaling is required for measuring and configuring the TCI states of neighboring cells. This problem was addressed in Release 17 using a unified TCI state. In Release 17, the maximum number of unified TCI states defined is 1 for downlink M and 1 for uplink N. For multi-TRP scenarios, the number of unified TCI states required for operation is greater than one. This is currently under discussion in Rel-18 to increase the number of TCI states for multi-TRP operations.

[0003] The unified TCI defined in Release 17 contains a common TCI state for all physical channels and RSs. In earlier Releases 15 / 16, the TCI framework was unnecessarily modular. A TCI was defined for each Control Resource Set (CORESET). Therefore, a Physical Downlink Control Channel (PDCCH) transmitted in a particular CORESET would be received using the TCI state defined for that CORESET. Each PDCCH would then be configured with a TCI state for the Physical Downlink Shared Channel (PDSCH). The signaling for TCI states was also modified in Release 17 because minimal redundant signaling was required. In Releases 15 / 16, the TCI state for the PDCCH was configured by the MAC-CE for each CORESET. Radio Resource Control (RRC) signaling was used to configure several TCI states in all TCI state pools. For the PDSCH, the MAC-CE would then configure up to eight TCI code points for each TCI state. The TCI for the PDSCH was indicated in the Downlink Control Information (DCI) pointing to one of the TCI code points. In version 17, the signaling for TCI status was changed to MAC CE or MAC CE+DCI with or without downlink (DL) allocation in format 1_1 / 1_2.

[0004] In version 17, a new type of TCI state was introduced as a joint TCI state. Therefore, any common unified TCI state can be a joint TCI state or a separate DL / UL TCI state. Version 15 / 16 TCI states were CORESET-based, so configuring two TCI states was straightforward. In a scenario where the UE receives two DCIs from two different TRPs, they are sent from two different CORESETs, and the CORESETPOOLINDEX is set to be different for that CORESET to identify the multiple DCIs for the UE. Each DCI is configured with a separate PDSCH to receive from multiple TRPs. In a single DCI multi-TRP scenario, a single DCI is sent to the UE from any TRP, which schedules two different PDSCHs for the UE. The DCI contains a TCI field pointing to a single TCI code point, which also contains a pair of TCI states for each TRP. During the Rel-18 discussion on unified TCI for MTRPs, default beaming behavior was discussed for S-DCI and M-DCI. The default beam behavior is that when two indicated TCIs exist, the PDSCH scheduling time via PDCCH DCI format 1_0 / 1_1 / 1_2 is before the threshold (timeDurationForQCL). In M-DCI and S-DCI, when the UE capability can only handle a single default beam in FR1 or FR2, it is necessary to define which of the two indicated TCIs should be considered the default indicated TCI state for PDSCH reception.

[0005] In addition, the Network Energy Saving (NES) work item (WI) is considering spatial domain and power domain technologies for Rel-18.

[0006] According to the agreed WID: RP-223540

[0007] -RAN-1 should specify the following technologies in both the spatial and power domains.

[0008] - Specify the necessary enhancements to CSI and beam management related processes, including measurement and reporting, as well as signaling [RAN1, RAN2] to enable efficient adaptation of spatial elements (e.g., antenna ports, active transceiver chains);

[0009] - Specify the necessary enhancements to CSI-related processes, including measurement and reporting, as well as signaling [RAN1, RAN2] for effective adaptation of power offset values ​​between PDSCH and CSI-RS.

[0010] It should be noted that the above objectives are only for UE-specific channels / signals, and that traditional UE CSI / CSI-RS capabilities apply when considering the total number and requirements of CSI reports.

[0011] Network power savings can be achieved by disabling the TxRU at the gNB. However, if implemented (semi-)statically, this can adversely affect cell capacity. NES WI aims to perform these silencing operations more dynamically. Recovery from the "off" state during dynamic real-time operation is another important concern. It should be noted that silencing / unsilencing operations will affect downlink CSI measurements in the network. The gNB may require:

[0012] - Multiple CSI feedbacks, potentially for multiple silent modes; and

[0013] - More detailed or informative CSI feedback (some additional information beyond the current feedback).

[0014] The traditional CSI feedback process is summarized below:

[0015] -CSI acquisition and feedback are used in existing technology networks to improve link quality and system capacity. It broadly includes the following steps:

[0016] -gNB configures / requests the UE to perform CSI-RS measurements on the currently configured CSI port.

[0017] - The UE measures downlink channel information (CQI, PMI, RI) and feeds it back to the gNB.

[0018] -gNB aggregates CSI information from connected UEs to design precoders and (co-)schedule users.

[0019] There are various ways to achieve dynamic silencing / unsilencing. Each of these methods will affect different aspects of the CSI feedback process. They will also affect system performance differently.

[0020] Therefore, it is hoped that the above-mentioned problems and shortcomings can be resolved or at least a useful alternative can be provided. Summary of the Invention

[0021] [Technical Issues]

[0022] The main objective of the embodiments described herein is to determine the default TCI state received by the PDSCH in the UE when multiple TCI states are configured.

[0023] Another objective of this embodiment is to provide a method and procedure for instructing a single unified TCI in one of the two configured active TCI states to receive PDSCH in intra-cell and inter-cell multi-TRP scenarios when the scheduling offset is less than a threshold (timeDurationForQCL).

[0024] Another objective of the embodiments herein is to disclose pilot sequences for calibrating UEs in MTRP scenarios.

[0025] Another objective of the embodiments described herein is to provide systems and methods for saving network energy by using user-recommended port adaptation (especially port silencing).

[0026] Another objective of the embodiments herein is to provide a system and method for saving network energy by using user-recommended port adaptation (especially port silencing), wherein port quality information of all transmit ports of the UE is used for CSI acquisition.

[0027] Another objective of the embodiments herein is to provide a system and method for using channel feedback for port adaptation (especially port silencing) to save network energy, wherein, in order to capture CSI, the gNB requests the UE to provide CSI information corresponding to each silencing mode.

[0028] Another objective of the embodiments herein is to provide a system and method for using channel feedback for port adaptation (especially port silencing) to save network energy, wherein type 2 CSI feedback is used for CSI acquisition.

[0029] Another objective of the embodiments herein is to provide a system and method for saving network energy by using port adaptation (in particular port silencing) through channel feedback, wherein the gNB requests the UE to feed back CSI information (for capturing CSI), including conventional (Type 2) and additional measurements, in order to determine an appropriate silencing mode.

[0030] [Technical Solution]

[0031] This disclosure relates to determining the default TCI state for PDSCH reception.

[0032] In embodiments of this disclosure, a method is provided performed by a user equipment (UE) when multiple indicated TCI states are present. The method includes receiving scheduling information of a physical downlink shared channel (PDSCH) via a physical downlink control information (DCI) format via a physical downlink control channel (PDCCH) before a predetermined time threshold (duration of the QCL). The PDCCH DCI format includes a scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. Furthermore, the method includes determining whether the UE is capable of processing a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2). Additionally, the method includes, when the UE can only process a single default beam in FR2, determining, based on the two indicated TCI states, whether at least one of an intra-cell multiple transmit / receive point (MTRP) multi-DCI mode and an intra-cell MTRP single-DCI mode is a joint TCI mode or a separate TCI mode.

[0033] In embodiments of this disclosure, a method is provided for execution by a user equipment (UE) when multiple indicated TCI states are present. The method includes determining, based on two indicated TCI states, whether at least one of an inter-cell MTRP multi-DCI mode and an inter-cell MTRP single-DCI mode is a joint TCI mode or a single TCI mode, when the UE can only process a single default beam in frequency range 2 (FR2). Furthermore, the method includes selecting the first indicated TCI state as the default indicated TCI state when the first indicated TCI state belongs to the serving cell and the second indicated TCI state contains QCL information having a physical cell ID (PCID) different from that of the serving cell. Additionally, the method includes selecting the second indicated TCI state as the default indicated TCI state when the second indicated TCI state belongs to the serving cell and the first indicated TCI state contains QCL information having a PCID different from that of the serving cell.

[0034] In embodiments of this disclosure, a user equipment (UE) is provided. The UE includes a processor, a memory coupled to the processor, and a first controller communicatively coupled to the memory and the processor. The first controller receives scheduling information of the physical downlink shared channel (PDSCH) via a physical downlink control information (DCI) format before a predetermined time threshold (duration of the QCL). The PDCCH DCI format includes a scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. Furthermore, the first controller determines whether the UE is capable of handling a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2). Additionally, if the UE can only handle a single default beam in FR2, the first controller determines, based on two indicated TCI states, whether at least one of an intra-cell multiple transmit / receive point (MTRP) multi-DCI mode and an intra-cell MTRP single-DCI mode is a joint TCI mode or a separate TCI mode.

[0035] In embodiments of this disclosure, a user equipment (UE) is provided. The UE includes a processor, a memory coupled to the processor, and a second controller communicatively coupled to the memory and the processor. When the UE can only process a single default beam in frequency range 2 (FR2), the second controller determines, based on two indicated TCI states, whether at least one of an inter-cell MTRP multi-DCI mode and an inter-cell MTRP single-DCI mode is a joint TCI mode or a single TCI mode. Furthermore, when the first indicated TCI state belongs to the serving cell and the second indicated TCI state contains QCL information having a PCID different from the physical cell ID (PCID) of the serving cell, the second controller selects the first indicated TCI state as the default indicated TCI state. Additionally, when the second indicated TCI state belongs to the serving cell and the first indicated TCI state contains QCL information having a PCID different from the PCID of the serving cell, the second controller selects the second indicated TCI state as the default indicated TCI state.

[0036] These and other aspects of the embodiments described herein will be better appreciated and understood when considered in conjunction with the following description and accompanying drawings. However, it should be understood that while the following description indicates preferred embodiments and many specific details therein, it is given by way of illustration rather than limitation. Many changes and modifications can be made within the scope of the embodiments described herein. Attached Figure Description

[0037] These and other features, aspects, and advantages of this embodiment are illustrated in the accompanying drawings, in which the same reference numerals denote corresponding parts in the various drawings. The embodiments herein will be better understood through the following description with reference to the accompanying drawings, in which:

[0038] Figure 1 This is a block diagram illustrating the updating and application of a single unified / indicator TCI status of version 17 to the PDCCH and PDSCH according to existing technology.

[0039] Figure 2 This is a block diagram illustrating the updating and application of a single unified / indicative TCI state of version 17 to the Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), and Sounding Reference Signal (SRS) according to the prior art.

[0040] Figure 3A and Figure 3B This is a block diagram illustrating a user equipment (UE) implemented according to an embodiment of the present disclosure to perform the disclosed subject matter.

[0041] Figure 4 This is a flowchart illustrating a method for determining the TCI state of a default indication received by a PDSCH during MTRP within a cell, according to an embodiment of the present disclosure.

[0042] Figure 5 This is a flowchart illustrating a method for determining the TCI state of a default indication received by a PDSCH during inter-cell MTRP, according to an embodiment of the present disclosure.

[0043] Figure 6 This is a schematic diagram illustrating an example pilot vector according to an embodiment of the present disclosure.

[0044] Figure 7A and Figure 7B This is a schematic diagram illustrating an example FFT of the pilot vector according to an embodiment of the present disclosure.

[0045] Figure 8 This is a schematic diagram illustrating another example FFT of the pilot vector according to an embodiment of the present disclosure.

[0046] Figure 9 This is a schematic diagram illustrating a rectangular two-dimensional (2D) pilot grid according to an embodiment of the present disclosure.

[0047] Figure 10 This is a schematic diagram illustrating a 2D FFT of a 2D pilot vector according to an embodiment of the present disclosure.

[0048] Figure 11 This is a schematic diagram illustrating a 2D FFT of a 2D pilot vector according to an embodiment of the present disclosure.

[0049] Figure 12 This is a sequence diagram illustrating a gNB capturing CSI by requesting the UE to provide CSI information corresponding to each silent mode, according to an embodiment of the present disclosure.

[0050] Figure 13 This is a sequence diagram illustrating a gNB capturing CSI by requesting the UE to provide CSI information corresponding to a subset of the configured silent mode, according to an embodiment of this disclosure.

[0051] Figure 14 This is a sequence diagram illustrating a gNB requesting the UE to provide port quality information for all transmitting ports obtained for CSI, according to an embodiment of this disclosure.

[0052] Figure 15 This is a schematic diagram illustrating the process of using a projection matrix for calculating port quality information according to an embodiment of the present disclosure.

[0053] Figure 16 This is a sequence diagram illustrating the process by which a gNB, according to an embodiment of the present disclosure, uses a fully or partially unsilent CSI port mode for CSI acquisition.

[0054] Figure 17 This is a schematic diagram illustrating the process by which a gNB, according to an embodiment of the present disclosure, uses a fully or partially unsilent CSI port mode for CSI acquisition.

[0055] It will be noted that, to the extent possible, the same reference numerals are used to denote the same elements in the figures. Furthermore, those skilled in the art will understand that the elements in the figures are shown for simplicity and may not necessarily be drawn to scale. For example, the dimensions of some elements in the figures may be exaggerated relative to others to aid in understanding aspects of the invention. Additionally, elements in the figures may have been represented by conventional symbols, and the figures may only show specific details relevant to understanding embodiments of the invention, so as not to obscure the figures with details readily understood by those skilled in the art from the description herein. Detailed Implementation

[0056] Other technical features will be obvious to those skilled in the art based on the following figures, description and claims.

[0057] Before proceeding with the detailed description below, it may be advantageous to define certain words and phrases used throughout this patent document. The term “coupled” and its derivatives refer to any direct or indirect communication between two or more elements, whether or not these elements are physically in contact with each other. The terms “transmit,” “receive,” and “communicate,” and their derivatives include both direct and indirect communication. The terms “comprising” and “including,” and their derivatives, mean including but not limited to. The term “or” is inclusive, meaning and / or. The phrase “associated with,” and its derivatives, mean including, being included in, interconnected with, containing, being contained within, connected to or connected to, coupled to or coupled with, able to communicate with, cooperate with, interleaved, juxtaposed, proximate, bound to or bound to, having, possessing the properties of, having a relationship to or with, etc. The term “controller” means 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" 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.

[0058] Furthermore, the various functions described below can be implemented or supported by one or more computer programs, each computer program being formed by computer-readable program code and embodied 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 drive, optical disc (CD), digital video disc (DVD), or any other type of storage. "Non-transitory" computer-readable media does not include wired, wireless, optical, or other communication links that transmit transient electrical or other signals. Non-transitory computer-readable media includes media in which data can be permanently stored and media in which data can be stored and later rewritten, such as rewritable optical discs or erasable memory devices.

[0059] Definitions of certain other words and phrases are provided in this patent document. Those skilled in the art will understand that, in many cases (if not most), such definitions apply to the prior and future use of the words and phrases defined in this way.

[0060] The embodiments described herein, along with their various features and advantageous details, are explained more fully with reference to the non-limiting embodiments illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques have been omitted to avoid unnecessarily obscuring the embodiments herein. Furthermore, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with multiple other embodiments to form new embodiments. Unless otherwise stated, the term "or" as used herein means non-exclusive or. The examples used herein are intended only to facilitate understanding of how the embodiments described herein can be practiced and to further enable those skilled in the art to practice the embodiments described herein. Therefore, these examples should not be construed as limiting the scope of the embodiments described herein.

[0061] As is customary in the art, embodiments are described and illustrated in terms of blocks that perform one or more of the described functions. These blocks (referred to herein as managers, units, modules, hardware components, etc.) are physically implemented by analog and / or digital circuitry (such as logic gates, integrated circuits, microprocessors, microcontrollers, memory circuitry, passive electronic components, active electronic components, optical components, hardwired circuitry, etc.) and optionally driven by firmware and software. For example, the circuitry is embodied in multiple semiconductor chips or on a substrate support such as a printed circuit board. The circuitry constituting a block can be implemented by dedicated hardware, by a processor (e.g., multiple programmed microprocessors and associated circuitry), or by a combination of dedicated hardware performing some functions of the block and a processor performing other functions of the block. Without departing from the scope of the proposed method, each block of the embodiments is physically divided into two or more interacting and discrete blocks. Similarly, without departing from the scope of the proposed method, the blocks of the embodiments can be physically combined into more complex blocks.

[0062] The accompanying drawings are provided to aid in the easy understanding of the various technical features, and it should be understood that the embodiments presented herein are not limited to the drawings. Therefore, the proposed methods are to be interpreted as extending to any changes, equivalents, and substitutions other than those specifically set forth in the drawings. Although the terms first, second, etc., are used herein to describe various elements, these elements are not limited by these terms. These terms are generally used to distinguish one element from another.

[0063] The various actions, behaviors, blocks, steps, etc., in the method are executed in the order they are presented, in different orders, or simultaneously. Furthermore, in some embodiments, actions, behaviors, blocks, steps, etc., may be omitted, added, modified, or skipped without departing from the scope of the proposed method.

[0064] Figure 1 This is a block diagram illustrating the updating and application of a single unified / indicator TCI status of version 17 to the PDCCH and PDSCH according to existing technology. Figure 2 This is a block diagram illustrating the updating and application of a single unified / indicative TCI state of version 17 to the Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), and Sounding Reference Signal (SRS) according to the prior art.

[0065] Release 17 introduced a unified TCI as a way to reduce the overhead signaling of the TCI for each physical channel and reference signal (RS). It was observed that multiple physical channels follow the same TCI state across multiple time slots, making it redundant to configure a new TCI state for each channel in each time slot. Furthermore, a common type of signaling is required for measuring and configuring the TCI states of neighboring cells. This problem was addressed in Release 17 using a unified TCI state. In Release 17, the maximum number of unified TCI states defined is 1 for downlink M and 1 for uplink N. For multi-TRP scenarios, the number of unified TCI states required for operation is greater than one. This is currently under discussion in Rel-18 to increase the number of TCI states for multi-TRP operations.

[0066] The unified TCI defined in Release 17 contains a common TCI state for all physical channels and RSs. In earlier Releases 15 / 16, the TCI framework was unnecessarily modular. A TCI was defined for each Control Resource Set (CORESET). Therefore, a Physical Downlink Control Channel (PDCCH) transmitted in a particular CORESET would be received using the TCI state defined for that CORESET. Each PDCCH would then be configured with the TCI state for the Physical Downlink Shared Channel (PDSCH). The signaling for the TCI state was also modified in Release 17 because minimal redundant signaling was required. In Releases 15 / 16, the TCI state for the PDCCH was configured by the MAC-CE for each CORESET. Radio Resource Control (RRC) signaling was used to configure several TCI states in all TCI state pools. For the PDSCH, the MAC-CE would then configure up to eight TCI code points for each TCI state. The TCI for the PDSCH was indicated in the Downlink Control Information (DCI) pointing to one of the TCI code points. In version 17, the signaling for TCI status was changed to MAC CE or MAC CE+DCI with or without downlink (DL) allocation in format 1_1 / 1_2.

[0067] In version 17, a new type of TCI state was introduced as a joint TCI state. Therefore, any common unified TCI state can be a joint TCI state or a separate DL / UL TCI state. Version 15 / 16 TCI states were CORESET-based, so configuring two TCI states was straightforward. In a scenario where the UE receives two DCIs from two different TRPs, they are transmitted from two different CORESETs, and the CORESETPOOLINDEX is set to be different for that CORESET to identify the multiple DCIs for the UE. Each DCI is configured with a separate PDSCH to receive from multiple TRPs. In a single DCI multi-TRP scenario, a single DCI is transmitted to the UE from any TRP, which schedules two different PDSCHs for the UE. The DCI contains a TCI field pointing to a single TCI code point, which also contains a pair of TCI states for each TRP. During the Rel-18 discussion on unified TCI for MTRPs, the default beaming behavior of S-DCI and M-DCI was discussed. The default beam behavior is that when two indicated TCIs exist, the PDSCH scheduling time via PDCCH DCI format 1_0 / 1_1 / 1_2 is before the threshold (timeDurationForQCL). In M-DCI and S-DCI, if the UE capability can only handle a single default beam in FR1 or FR2, it is necessary to define which of the two indicated TCIs should be considered the default indicated TCI state for PDSCH reception.

[0068] Unlike traditional methods, this disclosure provides a method and procedure for instructing one or more unified TCIs in two configured active TCI states to receive PDSCH for all multi-TRP scenarios when the scheduling offset is less than a threshold (timeDurationForQCL). Multi-TRP scenarios include inter-cell multi-DCI and S-DCI.

[0069] The embodiments disclosed herein provide a system and method for a default indication TCI state for an inter-cell MTRP with a unified TCI framework. The method includes a PDSCH receiving a PDSCH where, when two indicated TCI states exist and the MTRP mode is set to a federated / individual TCI mode and the two indicated TCI states are configured as a first federated / DL TCI state and a second federated / DL TCI state, the default indicated TCI state is the first indicated TCI state. In an embodiment, the default indicated TCI state is the second indicated TCI state. In an embodiment, the default indicated TCI state is configurable and can be configured by the RRC for the CORESET of the transmitted PDCCH. In an embodiment, the default indicated TCI state can be configured by the MAC-CE for the CORESET of the transmitted PDCCH. In an embodiment, the default indicated TCI state is the indicated TCI of the lowest CORESET ID. In an embodiment, the default indicated TCI state is the first indicated TCI state / the second indicated TCI state set by the RRC per CC / BWP. In this embodiment, the default indicated TCI state is the first indicated TCI state / the second indicated TCI state set by the MAC-CE per CC / BWP.

[0070] Now refer to the accompanying drawings, and more specifically to Figures 3 to 4. Figure 17 The preferred embodiments are shown in which similar reference numerals consistently denote corresponding features throughout the figures.

[0071] Figure 3A and Figure 3B This is a block diagram illustrating a user equipment (UE) (302) implemented according to an embodiment of the present disclosure to perform the disclosed subject matter. Figure 3A and Figure 3B Each component of the disclosed terminal can be implemented within a terminal, and each component can be organically connected to perform operations. For example, the UE (302) can be, but is not limited to, a smartphone, tablet, laptop, personal computer (PC), television, connected car, IoT device, etc. Figure 3A As shown, the UE (302) includes a processor (304), a memory (306), an I / O interface (308), and a first controller (310). Each component will be described in further detail below.

[0072] The processor (304) communicates with the memory (306), the I / O interface (308), and the first controller (310). The processor (304) is configured to execute instructions stored in the memory (306) and perform various processes. The processor (304) may include one or more processors, which may be general-purpose processors such as central processing units (CPUs), application processors (APs), graphics-only units such as graphics processing units (GPUs), visual processing units (VPUs), and / or artificial intelligence (AI) dedicated processors such as neural processing units (NPUs). The processor (304) may communicate with... Figure 3A The first controller (310) and Figure 3B The second controller (312) operates organically to control the operation of the controllers (310, 312) and command the operations described in this disclosure to be performed.

[0073] The memory (306) includes storage locations addressable by the processor (304). The memory (306) is not limited to volatile memory and / or non-volatile memory. Furthermore, the memory (306) may include multiple computer-readable storage media. The memory (306) may include non-volatile storage elements. For example, non-volatile storage elements may include magnetic hard disks, optical disks, floppy disks, flash memory, or electrically programmable memory (EPROM) or electrically erasable programmable memory (EEPROM).

[0074] The I / O interface (308) transmits information between the memory (306) and external peripheral devices. Peripheral devices are input-output devices associated with the UE (302). Furthermore, the first controller (310) communicates with both the I / O interface (308) and the memory (306). The first controller (310) can be communicatively coupled to both the memory (306) and the processor (304). The first controller (310) is innovative hardware implemented through the physical realization of analog and digital circuits, including logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive and active electronic components, and optical components.

[0075] In this embodiment, the first controller (310) receives PDSCH scheduling information in PDCCH downlink control information (DCI) format before a predetermined time threshold (duration of QCL). PDSCH is the primary channel used to transmit user data in the downlink direction (e.g., from the base station to the UE (302)). PDSCH is responsible for carrying the actual user data (e.g., voice, video, Internet packets, etc.), as well as other downlink signaling and system information. PDSCH operates on a shared channel basis, which means that it dynamically shares radio resources (time and frequency) among multiple users.

[0076] The PDCCH is a critical control channel for transmitting scheduling, HARQ, and power control information to the UE (302). It enables dynamic allocation of resources for downlink (PDSCH) and uplink (PUSCH) transmissions, ensuring efficient network operation while adapting to changing radio conditions. By carrying a DCI, the PDCCH coordinates when and how the UE (302) should receive or transmit data. The DCI is the actual message carried by the PDCCH. It contains various fields informing the UE (302) how to decode the PDSCH (for downlink data) or when and how to transmit data on the PUSCH (for uplink data). Different DCI formats are used depending on the message type.

[0077] For example, the PDCCH DCI format includes a scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. The scheduling offset between the PDCCH and PDSCH is the time delay (in symbols or time slots) between the end of the PDCCH and the start of the PDSCH. This offset allows the UE (302) to process control information received on the PDCCH before it begins receiving data on the PDSCH.

[0078] In an embodiment, the first controller (310) determines whether the UE (302) is capable of processing a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2). A single default beam refers to a pre-configured or default beam used for initial access, control signaling, or fallback purposes when more precise beamforming has not yet been applied or is unavailable. Furthermore, FR1 and FR2 refer to two wide frequency ranges defined by 3GPP standards for 5G network deployment. These ranges define operating bands and are divided according to their characteristics, with FR1 covering the sub-6 GHz band and FR2 covering the millimeter-wave (mmWave) band.

[0079] In this embodiment, the first controller (310) determines, based on two indicated TCI states, whether at least one of the following is a joint TCI mode or a single TCI mode: an intra-cell multi-transmission reception point (MTRP) multi-DCI mode or an intra-cell MTRP single-DCI mode. This is determined when the UE (302) can only handle a single default beam in FR2. MTRP refers to a configuration in which multiple TRPs operate within the same cell and coordinate the transmission and reception of their data. This can enhance the overall throughput and signal quality of the UE (302) by utilizing signals from different TRPs. Intra-cell means that all TRPs involved are within the same physical cell. Intra-cell MTRP multi-DCI mode refers to a scenario where a single cell operates with multiple TRPs to transmit and receive data from the UE. The use of multiple DCIs allows the network to schedule different TRPs for joint or individual transmissions to the UE (302), thereby enhancing signal strength, capacity, and reliability. This can be useful for techniques like CoMP, beamforming, and distributed MIMO, which rely on coordinating multiple transmission points within the same cell to provide better service to the UE (302).

[0080] Intra-cell MTRP single DCI mode refers to a scenario where a single DCI message sent to the UE (302) is used to coordinate multiple TRPs within the same cell. This reduces control overhead, simplifies processing, and improves overall network efficiency when using multiple sending points to increase coverage, capacity, or reliability. By using multiple TRPs within the same cell, the network can provide better coverage, especially in areas with poor signal strength from a single TRP. A single DCI ensures that the UE (302) can receive data from multiple TRPs without processing multiple control messages.

[0081] In MTRP multi-DCI mode, the indicated TCI state with a CORESET pool index value of 0 is selected as the default indicated TCI state for PDSCH reception. For example, the indicated TCI state can include a first indicated TCI state and a second indicated TCI state. This selection occurs when MTRP multi-DCI mode is set to joint TCI mode or individual TCI mode and the two indicated TCI states are configured as a first joint or DL ​​TCI state and a second joint or DL ​​TCI state. A CORESET pool index value of 0 refers to the CORESET configuration used for specific control signaling. It can be used to send common control information or as the default CORESET for processing initial control signaling. This index allows the UE (302) and gNB to select the appropriate CORESET from a set of predefined configurations.

[0082] like Figure 3BAs shown, the UE (102) includes a processor (304), a memory (306), an I / O interface (308), and a second controller (312). The second controller (312) communicates with the I / O interface (308) and the memory (306). The second controller (312) can be communicatively coupled to the memory (306) and the processor (304). The second controller (312) is innovative hardware implemented through the physical realization of analog and digital circuits, including logic gates, integrated circuits, microprocessors, microcontrollers, memory circuits, passive and active electronic components, and optical components.

[0083] In this embodiment, the second controller (312) determines, based on two indicated TCI states, whether at least one of the inter-cell MTRP multi-DCI mode and inter-cell MTRP single-DCI mode is a joint TCI mode or a separate TCI mode. This is determined when the UE (302) can only process a single default beam in FR2. Inter-cell MTRP refers to a scenario involving multiple TRPs from different cells when sending data to a single UE (302). In inter-cell MTRP single-DCI, the gNB sends a single DCI message to the UE (302) containing scheduling information for multiple TRPs. This simplifies the control signaling process.

[0084] In this embodiment, when the first indicated TCI state belongs to the serving cell and the second indicated TCI state contains QCL information with a physical cell ID (PCID) different from that of the serving cell, the second controller (312) selects the first indicated TCI state as the default indicated TCI state. The serving cell refers to the cell for which the UE (302) has established active connections for both control plane and user plane communications. The serving cell handles all signaling and data transmissions (302) of the UE. The QCL information of the UE (302) refers to the quantized channel state information reported by the UE to the gNB. This information is crucial for optimizing multi-antenna technology, resource allocation, and overall network performance in the 5G NR system.

[0085] In this embodiment, the second controller (312) selects the second indicated TCI state as the default indicated TCI state. The second indicated TCI state is selected when it belongs to the serving cell and the first indicated TCI state contains QCL information with a PCID different from the PCID of the serving cell.

[0086] MTRP single DCI within the cell

[0087] In an embodiment, when there are two indicated TCI states and the MTRP mode is set to the combined / individual TCI mode and the two indicated TCI states are the first combined / DL TCI state and the second combined / DLTCI state, respectively, the default indicated TCI state received by the PDSCH will be the first indicated TCI state.

[0088] In this embodiment, the default indicated TCI state is the second indicated TCI state.

[0089] In this embodiment, the default indicated TCI state is configured by RRC for sending the PDCCH CORESET.

[0090] In one embodiment, the default indicated TCI state is configured by MAC-CE for sending the PDCCH CORESET.

[0091] In this embodiment, the default indicated TCI state is the TCI indicated by the lowest CORESET ID.

[0092] In this embodiment, the default indicated TCI state is the first indicated TCI state / the second indicated TCI state set by RRC per CC / BWP.

[0093] In this embodiment, the default indicated TCI state is the first indicated TCI state / the second indicated TCI state set by the MAC-CE per CC / BWP.

[0094] MTRP M-DCI within the community

[0095] In an embodiment, when there are two indicated TCI states and the MTRP multi-DCI mode is set to joint / individual TCI mode and the two indicated TCI states are respectively the first joint / DL TCI state and the second joint / DL TCI state, the default indicated TCI state received by the PDSCH will be the first indicated TCI state.

[0096] In this embodiment, the default indicated TCI state is the second indicated TCI state.

[0097] In this embodiment, the default indicated TCI state is any of the CORESETs configured by RRC for sending PDCCH.

[0098] In this embodiment, the default indicated TCI state is any of the CORESETs configured by MAC-CE for sending PDCCH.

[0099] In this embodiment, the default indicated TCI state is the TCI indicated by the lowest CORESET ID among all configured CORESETs.

[0100] In one embodiment, the default indicated TCI state is the TCI indicated by the lowest CORESET ID among the two CORESETs configured for M-DCI.

[0101] In this embodiment, the default indicated TCI state is the first indicated TCI state / the second indicated TCI state set by RRC per CC / BWP.

[0102] In this embodiment, the default indicated TCI state is the first indicated TCI state / the second indicated TCI state set by the MAC-CE per CC / BWP.

[0103] In this embodiment, the default indicated TCI state is the TCI indicated by coresetpoolindex 0.

[0104] In this embodiment, the default indicated TCI state is the TCI indicated by coresetpoolindex 1.

[0105] Small Interval MTRP SDCI

[0106] In an embodiment, when there are two indicated TCI states and the MTRP mode is set to the combined / individual TCI mode and the two indicated TCI states are configured as the first combined / DL TCI state and the second combined / DL TCI state, when only the indicated TCI belongs to the serving cell and other unified TCIs contain a PCID different from the serving cell's PCID (Physical Cell ID) in the QCL information, the default indicated TCI state received by the PDSCH will be the first indicated TCI state; otherwise, the second indicated TCI state will be the default indicated TCI state.

[0107] In an embodiment, when only the indicated TCI belongs to the serving cell and other uniform TCIs contain a PCID different from the PCID of the serving cell in the QCL information, the default indicated TCI state is the second indicated TCI state; otherwise, the first indicated TCI state will be the default indicated TCI state.

[0108] In this embodiment, the default indicated TCI status is the TCI indicated by the serving cell / the unified TCI that does not contain the PCID in the QCL information.

[0109] In the embodiment, the default indicated TCI state is configured by RRC for the CORESET that sends PDCCH based on which CORESET is associated with the serving cell.

[0110] In the embodiment, the default indicated TCI state is configured by the MAC-CE based on which CORESET is associated with the serving cell for the CORESET that sends the PDCCH, or is a unified TCI that does not contain the PCID in the QCL information.

[0111] In this embodiment, the default indicated TCI state is the TCI with the lowest CORESET ID of the serving cell / the unified TCI that does not contain a PCID in the QCL information.

[0112] In an embodiment, if the default indicated TCI state comes from the serving cell / is a unified TCI that does not contain a PCID in the QCL information, then the default indicated TCI state is the first indicated TCI state / second indicated TCI state set by RRC per CC / BWP.

[0113] In an embodiment, if the default indicated TCI state comes from the serving cell / unified TCI that does not contain a PCID in the QCL information, then the default indicated TCI state is the first indicated TCI state / second indicated TCI state set by MAC-CE per CC / BWP.

[0114] Small Interval MTRP M-DCI

[0115] In an embodiment, when there are two indicated TCI states and the MTRP mode is set to the combined / individual TCI mode and the two indicated TCI states are configured as the first combined / DL TCI state and the second combined / DL TCI state, if only the indicated TCI belongs to the serving cell and other unified TCIs contain a PCID different from the serving cell's PCID in the QCL information, the default indicated TCI state received by the PDSCH will be the first indicated TCI state; otherwise, the second indicated TCI state will be the default indicated TCI state.

[0116] In an embodiment, if only the indicated TCI belongs to the serving cell and other unified TCIs contain a PCID (Physical Cell ID) different from the serving cell in the QCL information, then the default indicated TCI state is the second indicated TCI state; otherwise, the first indicated TCI state will be the default indicated TCI state.

[0117] In this embodiment, the default indicated TCI status is the TCI indicated by the serving cell / the unified TCI that does not contain the PCID in the QCL information.

[0118] In this embodiment, the default indicated TCI state is configured by RRC for any of the CORESETs associated with the serving cell that sent the PDCCH.

[0119] In this embodiment, the default indicated TCI state is configured by MAC-CE for any of the CORESETs associated with the serving cell that sent the PDCCH.

[0120] In this embodiment, the default indicated TCI state is the first indicated TCI state / second indicated TCI state associated with the serving cell set by the RRC per CC / BWP.

[0121] In this embodiment, the default indicated TCI state is the first indicated TCI state / second indicated TCI state associated with the serving cell set by the MAC-CE per CC / BWP.

[0122] In this embodiment, the default indicated TCI state is the TCI indicated by coresetpoolindex 0.

[0123] In this embodiment, the default indicated TCI state is the TCI indicated by coresetpoolindex 1.

[0124] In the embodiments, the default indicated TCI is always associated with coresetpoolindex 0 and / or CORESET 0 in the inter-cell M-DCI MTRP and the serving cell.

[0125] In this embodiment, the indicated TCI 1 will always be associated with the serving cell, so the TCI indicated by the default TCI received by the PDSCH will always be 1.

[0126] In the embodiments, the opposite is true.

[0127] In an embodiment, when the coresetPoolIndex value 0 associated with the indicated TCI is associated with a PCI different from the serving cell PCI,

[0128] The UE should apply the Rel.15 default QCL assumption (i.e., the QCL assumption of the lowest CORESET ID in the latest slot) to both non-UE-specific and UE-specific PDSCH.

[0129] When the QCL-TypeD attributes of the default beams in the time slots of CCs in a frequency band are different, the default beam of the CC with the lowest ID is given priority. That is, the default beam of the CC with the lowest ID is applied to all CCs in the frequency band.

[0130] In an embodiment, when the coresetPoolIndex value 0 associated with the indicated TCI is associated with a PCI different from the serving cell PCI, the UE should apply the Rel.15 default QCL assumption (i.e., the QCL assumption of the lowest CORESET ID) for both the non-UE dedicated PDSCH and the UE dedicated PDSCH.

[0131] In the embodiments, when the indicated TCI is associated with the serving cell PCI (i.e., within the cell), the UE always uses the indicated TCI for UE-specific / non-UE-specific PDSCH (i.e., without considering the default QCL).

[0132] The same method described above is applied to the default beam of aperiodic CSI-RS.

[0133] Note: gNB guarantees that QCL assumptions / TCI states associated only with PCIDs that are the same as the PCID of the serving cell can be applied to non-UE-specific PDSCHs (if scheduled).

[0134] In the implementation, gNB always ensures that coresetPoolIndex 0 is always associated with the serving cell.

[0135] In the embodiment, when there are two indicated TCI states and the MTRP mode is set to the combined / individual TCI mode and the two indicated TCI states are the first combined / DL TCI state and the second combined / DLTCI state, and if the UE can only process a single default indicated TCI state when the scheduled PDSCH is less than the threshold (timeDurationForQCL), then inter-cell multi-DCI in version 18 does not support this feature.

[0136] In an embodiment, support for this disclosure in version 18 depends on the capabilities of the UE.

[0137] Figure 4 This is a flowchart illustrating a method for determining the TCI state of a default indication of PDSCH reception during intra-cell MTRP according to embodiments disclosed herein. The method includes steps (402-406). These steps are further described in detail below.

[0138] In step (402), the UE (302) receives PDSCH scheduling information via PDCCH downlink control information (DCI) format before a predetermined time threshold (the duration of QCL). PDSCH is the primary channel used for transmitting user data downlink (e.g., from the base station to the UE (302)). PDSCH is responsible for transmitting real user data (e.g., audio, video, internet packets) as well as other downlink signals and system information. PDSCH operates on a shared channel, meaning it dynamically allocates radio resources (time and frequency) among multiple users.

[0139] The PDCCH is a critical control channel for sending scheduling, HARQ, and power control data to the UE (302). It allows for the dynamic allocation of resources for downlink (PDSCH) and uplink (PUSCH) broadcasts, ensuring smooth network operation while responding to changing radio environments. By carrying a DCI, the PDCCH determines when and how the UE (302) should receive or transmit data. The DCI is the actual message sent by the PDCCH. It includes numerous fields that instruct the UE (302) how to decode the PDSCH (for downlink data) and when and how to broadcast it on the PUSCH (for uplink data). The type of communication determines which DCI format is used.

[0140] For example, the PDCCH DCI format includes a scheduling offset between the final PDCCH symbol and the first PDSCH symbol. The scheduling offset between the PDCCH and PDSCH is the time difference (in symbols or time slots) between the end of the PDCCH and the start of the PDSCH. This offset allows the UE (302) to process control information received via the PDCCH before it begins receiving data via the PDSCH.

[0141] In step (404), the UE (102) determines whether it can process a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2). A single default beam is a pre-configured or default beam used for initial access, control signaling, or fallback when more precise beamforming is not yet implemented or is inaccessible. Furthermore, the terms FR1 and FR2 refer to two large frequency bands established by the 3GPP specifications for 5G network implementation. These ranges establish operating frequency bands, which are classified according to their characteristics, with FR1 covering sub-6 GHz and FR2 covering millimeter wave (mmWave).

[0142] In step (406), the UE (102) determines, based on two indicated TCI states, whether at least one of the Intra-Cell Multiple Transmitter Receiver Point (MTRP) Multi-DCI mode and the Intra-Cell MTRP Single-DCI mode is a joint TCI mode or a single TCI mode. This is determined when the UE (302) can only process a single default beam in FR2. MTRP refers to a setup where several TRPs operate within the same cell, coordinating data transmission and reception. This can improve the overall throughput and signal quality of the UE by combining signals from many TRPs. Intra-cell means that all TRPs are located within the same physical cell. Intra-Cell MTRP Multi-DCI mode describes a scenario where a single cell uses several TRPs to transmit and receive data from the UE. The use of several DCIs allows the network to schedule different TRPs for joint or individual transmissions to the UE (302), which improves signal strength, capacity, and reliability.

[0143] Intra-cell MTRP single DCI mode coordinates multiple TRPs within the same cell using a single DCI message sent to the UE (302). This reduces control overhead, simplifies processing, and improves overall network efficiency when using many transport points to enhance coverage, capacity, or reliability. Using multiple TRPs within the same cell allows the network to provide better coverage, especially in locations with low signal strength from a single TRP. A single DCI allows the UE (302) to receive data from many TRPs without having to process several control messages.

[0144] In MTRP multi-DCI mode, the default indicated TCI state received by the PDSCH is the state with a CORESET pool index of 0. For example, the indicated TCI state can include a first indicated TCI state and a second indicated TCI state. This option occurs when the MTRP multi-DCI mode is set to a combined or separate TCI mode and the two specified TCI states are configured as a first combined or DLTCI state and a second combined or DL ​​TCI state, respectively. A CORESET pool index value of 0 indicates a CORESET configuration for a specific control signaling. It can be used to send common control information or as the default CORESET for initial control signaling. This index allows the UE (302) and gNB to select the appropriate CORESET from a pre-configured list of configurations.

[0145] Figure 5 This is a flowchart illustrating a method for determining the TCI state of a default indication of PDSCH reception during inter-cell MTRP according to embodiments disclosed herein. The method includes steps (502-506). Each step is further described in detail below.

[0146] In step (502), the UE (302) determines, based on the two indicated TCI states, whether at least one of the inter-cell MTRP multi-DCI mode and inter-cell MTRP single-DCI mode is a joint TCI mode or a single TCI mode. This is determined when the UE (302) can only process a single default beam in FR2. Inter-cell MTRP is a scenario where data is transmitted to a single UE (302) using several TRPs from a single cell. During inter-cell MTRP single-DCI, the gNB delivers a single DCI message to the UE (302), which includes scheduling information for multiple TRPs. This simplifies the control signaling approach.

[0147] In step (504), when the first indicated TCI state belongs to the serving cell and the second indicated TCI state contains QCL information with a physical cell ID different from the physical cell ID (PCID) of the serving cell, the UE (302) selects the first indicated TCI state as the default indicated TCI state. The serving cell is the cell for which the UE (302) has established active connections for both control plane and user plane communications. The serving cell is responsible for all signaling and data transmission for the UE (302). The QCL information associated with the UE (302) refers to the quantized channel state information reported to the gNB. This information is crucial for improving multi-antenna methods, resource allocation, and overall network performance in 5G NR systems.

[0148] In step (506), the UE (102) selects the second indicated TCI state as the default indicated TCI state. The second indicated TCI state is selected when the UE belongs to the serving cell and the first indicated TCI state contains QCL information with a PCID different from the PCID of the serving cell.

[0149] The embodiments described herein implement pilot sequences for calibrating a UE in an mTRP scenario. Pilots can be used for UE (302) auxiliary calibration for delays and frequency offsets across multiple TRPs, where pilots from each TRP occupy a separate subcarrier. Multiple pilots from different TRPs can occupy the same subcarrier location (or time-frequency region) and are used for UE auxiliary calibration of the propagation distance from the TRP.

[0150] Figure 6 This is a schematic diagram illustrating an example pilot vector according to an embodiment disclosed herein. Consider N × 1 pilot vectors a. a(k) represents the k-th pilot in the vector. There are A subcarriers between two pilots. The pilot vectors are given by the following equation:

[0151]

[0152] This is the pilot vector at a given OFDM symbol.

[0153] In the embodiments of this paper, the N × N FFT matrix F is defined as a matrix, whose (i, j)th element is

[0154] .

[0155] The a-th column of F is composed of Represented. The pilot vector from the k-th TRP is given by... express, This represents the vector obtained by element-wise multiplication of each element of vectors a and b.

[0156] Figures 7A-7B This is a schematic diagram illustrating an example FFT of the pilot vector according to an embodiment disclosed herein. fb,N is a complex exponential sequence. The FFT of a complex exponential sequence in the frequency domain is a “shift” in the time domain, where the shift depends on b.

[0157] Figure 8 This is a schematic diagram illustrating another example FFT of the pilot vectors according to an embodiment disclosed herein. Pilots can originate from more than one TRP on the same set of subcarriers within the same OFDM symbol, thus allowing the use of a smaller number of subcarriers. Currently, a similar principle and design are used in uplink SRS. a1 and a2 are located on the same set of time-frequency locations. Note that a1 and a2 are located on the same set of subcarriers. Here, all pilot vectors of the TRP are in the same OFDM symbol and the same subcarrier location.

[0158] Analyzing the pilot vector only in the frequency domain provides delay information. The same pilot vector can also be analyzed in the time domain, in which case information will be provided via a Doppler FFT.

[0159] In the embodiments described herein, the pilot signals are analyzed in a 2D grid in time and frequency, which can simultaneously provide delay and Doppler information.

[0160] Figure 9 This is a schematic diagram illustrating a rectangular two-dimensional (2D) pilot grid according to an embodiment disclosed herein. All pilots are equally spaced in both the time and frequency domains. Pilots may be non-uniformly spaced in both the time and frequency domains and may also have other shapes (besides rectangles) in the time-frequency grid. The 2D pilot vectors may be repeated periodically. It may also be non-periodic and, in essence, semi-persistent. P and / or Q may also be zero.

[0161] Figure 10This is a schematic diagram illustrating a 2D FFT of a 2D pilot vector according to an embodiment disclosed herein. The 2D pilot grid is a unity sequence. The black box represents the 2D FFT of the 2D pilot grid. The white area within the black box represents the FFT coefficients with negligible energy. The shaded area within the black box represents the FFT coefficients with considerable energy. The pilot grid is M × N, where the first dimension is frequency and the second dimension is time. D1 depends on the propagation distance, and D2 depends on the frequency / Doppler shift.

[0162] Figure 11 This is a schematic diagram illustrating a 2D FFT of a 2D pilot vector according to an embodiment disclosed herein. The black box represents the 2D FFT of the 2D pilot grid. The white area within the black box represents FFT coefficients with negligible energy. The shaded area within the black box represents FFT coefficients with considerable energy. The pilot grid is M × N, where the first dimension is frequency and the second dimension is time. D1 depends on the propagation distance and A, and D2 depends on the frequency / Doppler shift and b. The 2D pilot grid is composed of... Given. K is a complex value that can be 1. Pilot resources may include the following (one or more of the following may be optional):

[0163] -1D or 2D pilot grid and the values ​​in the pilot grid.

[0164] - The position of the pilot grid.

[0165] - Details of the pilot grid, distances P and A in the frequency domain, distance Q in the time domain, and lengths M and N in both frequency and time (M is defined only if the 1D pilot grid is only in frequency, and N is defined if the 1D grid is only in time).

[0166] - If it is a 1D pilot grid value, then the values ​​a, N and Related, It is also related to the pilot value.

[0167] - If it is a 2D pilot grid, then they are the pilot values ​​or a, M, b, N, K respectively. .

[0168] - The periodicity of the pilot grid over time.

[0169] - Types: Periodic, Aperiodic, Semi-persistent.

[0170] - The ID of the associated TRP assigned to this resource.

[0171] 2D pilot grids used for various TRPs can overlap in the time-frequency domain. They can also be different and non-overlapping in the time-frequency domain.

[0172] All TRPs transmit pilot signals. The UE measures and feeds back various quantities related to propagation distance and frequency / Doppler spread to the gNb / TRP. The TRP pre-compensates for frequency / Doppler offset and propagation distance and transmits downlink signals.

[0173] The UE's propagation distance-related feedback can be one or more of the following:

[0174] - Propagation distance from TRP.

[0175] - The location and value of the first / last FFT bin with considerable energy. The FFT is the frequency channel FFT or the frequency channel PSD or anything of that kind. The FFT / PSD can be averaged over time.

[0176] - One or more correlations of the frequency domain channel. The correlations can be averaged over time (OFDM symbols).

[0177] - Actual FFT / PSD of the frequency domain channel.

[0178] The UE's frequency / Doppler offset feedback can be one or more of the following:

[0179] - Frequency / Doppler offset in Hz.

[0180] - Frequency / Doppler normalized offset (dimensional-free), which is the frequency / Doppler offset in Hz multiplied by the OFDM symbol duration (seconds) or any other duration, such as symbol + cp duration.

[0181] - FFT / PSD obtained from the channel across time (one or more subcarriers, or averaged if across subcarriers).

[0182] - The location and value of the channel in time for the first and last FFT / PSD bins (with considerable energy).

[0183] - One or more correlations of the channel across time. Correlation can be averaged across subcarriers.

[0184] Examples of pilot signals in the downlink can be CSI-RS, TRS, DMRS, correlation quantities, etc.

[0185] Examples of pilot signals in the uplink can be DMRS and SRS.

[0186] The embodiments described herein may disclose frequency / Doppler offset pre-compensation at the TRP. Let g represent the frequency offset (or Doppler offset) between the TRP and the UE (user equipment or mobile device). Let N, L, and Tc represent the number of samples in the OFDM symbol, the number of samples in the cyclic prefix, and the sample duration, respectively. Before the FFT of the OFDM operation, the receiver in the UE will prove the time-domain signal multiplied by... ,in The initial phase is ignored for the sake of simplifying the analysis (t is continuous time). Therefore, if TRP knows g from the UE feedback, and if x(t) is the signal to be transmitted from the UE, then the UE can switch to transmitting. The frequency shift effect is achieved through Perform pre-compensation.

[0187] Alternatively, let g' = g(N+1)Tc be the normalized frequency offset. After OFDM demodulation, all symbols in the subcarrier of the nth OFDM symbol are multiplied by Therefore, as an alternative, before transmission at the TRP, in the nth OFDM symbol, all data and pilot symbols mapped to the subcarrier can be multiplied by... To provide pre-compensation.

[0188] The embodiments described herein disclose performing propagation distance pre-compensation at the TRP.

[0189] Now let's discuss the impact of the propagation distance from TRP to UE.

[0190] Let d(k) be the demodulated symbol at the k-th subcarrier without timing offset. Timing offset comes into play due to the non-zero propagation distance. The timing offset is the delay of the first multipath at the receiver.

[0191] If the propagation distance causes a timing offset tooff, then the demodulation symbol at the k-th subcarrier is ,in This is the subcarrier spacing. Therefore, TRP can be achieved by multiplying the symbols mapped to the k-th subcarrier by before transmission. This is used for pre-compensation. This effectively ensures a significant reduction in frequency selectivity at the receiver. It also means that the k-th subcarrier is shifted left or advanced by an appropriate amount to compensate for the effects of propagation distance.

[0192] Figure 12This is a sequence diagram illustrating how a gNB (1202) according to an embodiment disclosed herein captures CSI by requesting the UE (302) to provide CSI information corresponding to each silent mode. In step 1, the gNB (1202) configures the UE (302) to measure the CSI of one or more CSI ports for silent modes. In step 2, the UE (302) measures the CSI information (CQI, PMI, RI) for each silent mode and provides it as one or more CSI sub-reports. In step 3, the gNB (1202) collects CSI information from all UEs. The gNB (1202) then uses this information to select silent modes and (co-)schedule users. Note that, based on the silent modes configured in step 1, the UE (302) can also be configured via RRC signaling to derive the CSI for a set of derived silent modes using a smaller number of CSI-RS transmissions than the number of silent modes (specifically, using a single CSI-RS transmission) in step 2. Then, the UE (302) can select a subset of these modes based on the UE's internal metrics (such as rate, etc.) (possibly subject to a "restricted set" indicated by the gNB (1202)). The UE (302) can then send a multi-CSI report corresponding to the mode it selected.

[0193] Figure 13 This is a sequence diagram illustrating how a gNB (1202) captures CSI by requesting a UE (302) to return CSI information corresponding to a subset of the configured silent mode, according to an embodiment disclosed herein. Embodiments herein disclose, as... Figure 1 Minor variations of the disclosed embodiments can prove very useful for estimating the performance benefits of one CSI port silent mode relative to another. In step 1, the gNB (1202) configures the UE (302) to measure the CSI of one or more CSI port silent modes. In step 2, the UE (302) measures the CSI information (CQI, PMI, RI) for each silent mode and feeds it back. Furthermore, the UE (302) can send an estimate of the energy fraction captured for one or more silent modes. For example, this feedback can take the following form:

[0194] (where abs(.) is used to select each element individually.)

[0195]

[0196] in, It contains downlink channels arranged in descending order of size. The diagonal matrix of singular values, express The i-th singular value is considered, and the i-th layer CSI feedback is taken into account. Here, for the considered CSI-RS transmission, it is assumed that there exists a receiver-side singular value. Ports and sending side Each port. This and other forms of scoring will help the gNB (1202) estimate the residual energy in the downlink channels of the non-feedback UEs, which in turn will help the gNB (1202) decide whether to silence or un-silence one or more ports. In step 3, the gNB (1202) collects CSI information from all UEs. The gNB (1202) then uses this information to select the silence mode and (co-)schedule users.

[0197] In an embodiment, the simplest way for the gNB (1202) to capture CSI is to request the UE (302) to feed back CSI information corresponding to each silent mode. Although a simple process, this method incurs significant feedback overhead. For example, for M antennas, theoretically, it is possible to propose... A silent mode would require an unrealistic amount of CSI feedback.

[0198] Figure 14 This is a sequence diagram illustrating a gNB (1202) requesting the UE to provide port quality information for all transmitting ports used for CSI acquisition, according to an embodiment disclosed herein. Figure 15 This is a schematic diagram illustrating the process of calculating port quality information using a projection matrix according to an embodiment disclosed herein.

[0199] In this embodiment, the method proposes to allow the gNB (1202) to perform CSI feedback for port silencing. The method includes, in step 1, the gNB (1202) configuring the UE (302) to measure the CSI of fully / partially unsilenced antenna patterns. In step 2, the UE (302) measures CSI information (CQI, PMI, RI) according to conventional procedures and feeds it back. Additionally, the UE (302) feeds back “port quality information” for all transmitting ports used for CSI acquisition. In step 3, the gNB (1202) collects all CSI information, including port quality information, from all connected UEs and uses this information to (co-)schedule users and determine which transmitting ports to silence.

[0200] In the embodiment, the UE (302) estimates the downlink channel. And perform singular value decomposition (SVD) on it:

[0201] ,

[0202] in Representation matrix The conjugate transpose of , and It includes descending order. A diagonal matrix of singular values. Here we assume... One sending port and One receive port is used for the current CSI timing. Then, the UE (302) can use the i right feature vectors for precoding to receive i-layer downlink data.

[0203] In this embodiment, the "projection" matrix is ​​constructed as follows: :

[0204] ,

[0205] Among them, matrix Including horizontally appended matrices The first i columns (corresponding to) (i principal singular values). Here we use a matrix. To approximate The column space.

[0206] In the embodiment, port quality information The calculation is as follows:

[0207] ,

[0208] in, It is column-by-column, and This indicates the user's preference to keep the corresponding port from being silenced. List.

[0209] In this embodiment, as a final step, gNB (1202) collects port quality information from all users. And decide on the silent / unsilence sending port and (jointly) schedule users.

[0210] In this embodiment, in addition to the port quality information in step 2, the UE (302) can also send an estimate of the fraction of captured energy. For example, it can send an indicator in the following form:

[0211] (where abs(.) is used to select each element individually.)

[0212]

[0213] in, It contains downlink channels arranged in descending order of size. The diagonal matrix of singular values, express The i-th singular value, and considering the i-th layer CSI feedback. Here we assume there is on the receiving side... There are 1 port on the sending side. Each port. This and other forms of scores will help the gNB (1202) estimate the residual energy in the downlink channels of UEs that have not received feedback.

[0214] In the embodiment, the different projection matrices in step 2B As shown below:

[0215] ,

[0216] Among them, matrix Including horizontally appended matrices The first i columns (corresponding to) (i principal singular values), and It is a diagonal matrix containing the first i principal singular values. Port quality information is calculated in step 2C. When using the above matrix Will provide for The column space is a "weighted" approximation. The remaining steps are similar to... Figure 14 and Figure 15 It is done in the same way as in China.

[0217] In this embodiment, in addition to the port quality information in step 2, the UE (302) can also send an estimate of the captured energy score, such as... Figure 14 and Figure 15 As shown. Indicators in the following forms can be used:

[0218] (where abs(.) is used to select each element individually.)

[0219]

[0220] The terms have their usual meanings as previously defined in Example 1. This and other forms of fractions will help gNB (1202) estimate the residual energy in the downlink channel of the UE that has not received feedback.

[0221] Figure 16 This is a sequence diagram illustrating the process by which a gNB (1202) performs CSI acquisition using a fully or partially unsilent CSI port mode according to an embodiment disclosed herein. Figure 17 This is a schematic diagram illustrating the process of a gNB (1202) performing CSI acquisition using a fully or partially unsilent CSI port mode according to an embodiment disclosed herein.

[0222] In step 1, the gNB (1202) configures the UE (302) to measure the CSI of layer i for a fully / partially non-silent CSI port mode. In step 2, the UE (302) measures the CSI of the mode and feeds back CQI, PMI, and RI information. In the case of a type 2 codebook, the PMI information currently includes i right eigenvectors of i layers requested by the gNB (1202). In addition to the right eigenvectors, the UE (302) may feed back i left eigenvectors and i singular values ​​to the gNB (1202). For the current CSI acquisition instance, the UE (302) estimates the downlink channel. And perform singular value decomposition (SVD) on it:

[0223] ,

[0224] in, Representation matrix The conjugate transpose of , and It includes items sorted in descending order of size. The diagonal matrix of singular values. Here, assume the transmitting side... Each port and the receiving side One port is used for the current CSI timing. Then, gNB(1202) can use i right eigenvectors for precoding to send up to i layers of downlink data.

[0225] Type 2 PMI codebook hypothesis A precoder structure, in which , It consists of L oversampled 2D DFT beams. Considering M sub-bands, the matrix dimensions are as follows:

[0226]

[0227] Currently, the aforementioned Type 2 structure can be used to feed back the right eigenvector (columns of the V matrix). The embodiments in this paper propose that the same Type 2 structure also be used to feed back the columns of the U matrix. Furthermore, the embodiments in this paper feed back the diagonal matrix in the aforementioned (enhanced) Type 2 CSI report. of There are singular values. Because typical deployment scenarios will have... Therefore, the additional feedback is expected to be much smaller in comparison.

[0228] The current type 2 feedback only includes the right eigenvector (columns of matrix V). Additional feedback (columns of matrix U and from the diagonal matrix) The singular values ​​can be sent along with existing feedback as part of the same CSI report. Alternatively, the additional feedback can be sent separately, possibly with lower periodicity, to further reduce overall feedback overhead.

[0229] In step 3, the gNB (1202) collects CSI information from all UEs and uses it for user coordinating. Since the gNB (1202) has an i-rank approximation of each user channel, it can now decide which transmission port to silently transmit to minimize the impact on network capacity or select some other system metrics. Once the gNB (1202) has received CSI information from all users... A precoder can jointly determine the users to be scheduled and the transmission ports to be silenced. For example, it can:

[0230] - Properly determine which transmit ports to silence or un-silence to minimize capacity loss.

[0231] -Even dynamically changing the sending port to silence on a time-slot basis.

[0232] Figure 16 and Figure 17 The process of the gNB (1202) using a fully / partially unsilenced CSI port mode for CSI acquisition is described. In step 1, the gNB (1202) configures the UE (302) to measure the CSI of layer i for the partially / fully unsilenced CSI port mode. In step 2, the UE (302) measures the CSI of the mode and feeds back CQI, PMI, and RI information. The PMI information includes i right eigenvectors and enhancements corresponding to i layers, such as i left eigenvectors and i singular values. The UE may also send some additional CSI-related information to the gNB (1202) to facilitate (co-)scheduling and port silencing / unsilencing. In step 3, the gNB (1202) collects CSI information from all UEs. It then uses this information to (co-)scheduling users and deciding which transmitting ports to silence or unsilence.

[0233] The additional CSI-related information that the UE (302) may send to the gNB (1202) in step 2 of the procedure (as disclosed in the previous clauses) may include an estimate of the energy fraction captured in the low-rank channel estimate it feeds back to the gNB (1202) performed by the UE (302). For example, it may be in the following form:

[0234] A. (where abs(.) is used to select each element individually.)

[0235] B.

[0236] in, Represents the downlink channel matrix The i-th singular value. This and other forms of fractions will help gNB (1202) estimate the residual energy in the UE's downlink channel that was not captured in the CSI feedback.

[0237] The description of the specific embodiments above will fully reveal the general nature of the embodiments herein. Others can easily modify and / or adapt these specific embodiments for various applications by applying existing knowledge without departing from the general concepts. Therefore, these modifications and adjustments are intended to be understood as equivalents of the disclosed embodiments in terms of meaning and scope. It should be understood that the wording or terminology used herein is for descriptive purposes and not for limitation. Therefore, although the embodiments herein have been described according to preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modifications within the scope of the embodiments described herein.

[0238] In embodiments of this disclosure, a method is provided performed by a user equipment (UE) when multiple indicated TCI states are present. The method includes receiving scheduling information of a physical downlink shared channel (PDSCH) via a physical downlink control information (DCI) format via a physical downlink control channel (PDCCH) before a predetermined time threshold (duration of the QCL). The PDCCH DCI format includes a scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. Furthermore, the method includes determining whether the UE is capable of processing a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2). Additionally, the method includes, when the UE can only process a single default beam in FR2, determining, based on the two indicated TCI states, whether at least one of an intra-cell multiple transmit / receive point (MTRP) multi-DCI mode and an intra-cell MTRP single-DCI mode is a joint TCI mode or a separate TCI mode.

[0239] In an embodiment, the method includes determining whether the MTRP multi-DCI mode is set to a combined TCI mode or a standalone TCI mode, and whether two indicated TCI states are configured as a first combined or downlink (DL) TCI state and a second combined or DL ​​TCI state. The method further includes: when the MTRP multi-DCI mode is set to a combined TCI mode or a standalone TCI mode and the two indicated TCI states are configured as a first combined or DL ​​TCI state and a second combined or DL ​​TCI state, selecting the indicated TCI state at CORESET pool index 0 as the default indicated TCI state for PDSCH reception.

[0240] In an embodiment, when the MTRP multi-DCI mode is set to a combined TCI mode or a single TCI mode and the two indicated TCI states are configured as a first combined or DL ​​TCI state and a second combined or DL ​​TCI state, the method includes selecting the first combined or DL ​​TCI state as the default indicated TCI state for PDSCH reception.

[0241] In an embodiment, when the MTRP mode is set to a combined TCI mode or a single TCI mode and the two indicated TCI states are configured as a first combined or DCI TCI state and a second combined or DCI TCI state, the method includes selecting the second combined or DCI TCI state as the default indicated TCI state for PDSCH reception.

[0242] In an embodiment, the method includes configuring a default indication TCI state for the reception of the PDSCH via Radio Resource Control (RRC) signaling or Media Access Control Element (MAC-CE) signaling. The method also includes selecting a default indication TCI state per component carrier (CC) or per bandwidth portion (BWP) based on the CORESET where the PDSCH is sent to the UE, via RRC signaling or MAC-CE signaling.

[0243] In this embodiment, the default indicated TCI state is selected based on the lowest CORESET ID among the multiple CORESETs configured for the UE.

[0244] In an embodiment, the method includes selecting the TCI state of the received PDSCH, which is associated with a default indication of a CORESET pool index value set to 1.

[0245] In embodiments of this disclosure, a method is provided for execution by a user equipment (UE) when multiple indicated TCI states are present. The method includes determining, based on two indicated TCI states, whether at least one of an inter-cell MTRP multi-DCI mode and an inter-cell MTRP single-DCI mode is a joint TCI mode or a single TCI mode, when the UE can only process a single default beam in frequency range 2 (FR2). Furthermore, the method includes selecting the first indicated TCI state as the default indicated TCI state when the first indicated TCI state belongs to the serving cell and the second indicated TCI state contains QCL information having a physical cell ID (PCID) different from that of the serving cell. Additionally, the method includes selecting the second indicated TCI state as the default indicated TCI state when the second indicated TCI state belongs to the serving cell and the first indicated TCI state contains QCL information having a PCID different from that of the serving cell.

[0246] In this embodiment, the default indicated TCI state is either belonging to the serving cell or an indicated TCI state that does not include the PCID in the QCL information.

[0247] In an embodiment, the method includes configuring a default indicated TCI state for PDSCH reception via Radio Resource Control (RRC) signaling or Media Access Control Element (MAC-CE) signaling. The method includes selecting, via RRC or MAC-CE signaling, a default indicated TCI state as a first indicated TCI state or a second indicated TCI state on a per-component carrier (CC) or per-bandwidth portion (BWP) basis, based on a CORESET associated with the serving cell where the PDSCH is transmitted to the UE.

[0248] In one embodiment, the CORESET pool index value of the TCI state of the default indication associated with the serving cell in the inter-cell MTRP MDCI is 0. In another embodiment, the CORESET pool index value of the TCI state of the default indication associated with the serving cell for PDSCH reception is 1.

[0249] In an embodiment, the method includes determining whether the TCI state of a default indication with a CORESET pool index value of 0 is associated with a PCI different from the PCI of the serving cell. The method includes applying the Rel-15 default QCL assumption to both the non-UE-specific PDSCH and the UE-specific PDSCH.

[0250] In one embodiment, the method includes determining whether the QCL characteristics of the default beam in the time slot of a CC in FR1 are different. The method includes selecting a default indicated TCI state based on the lowest CORESET ID in the latest time slot of the lowest CC ID among a plurality of CCs configured for the UE.

[0251] In an embodiment, the method includes determining whether the default indicated TCI state belongs to the serving cell. The method also includes selecting an indicated TCI state for both the non-UE-dedicated PDSCH and the UE-dedicated PDSCH.

[0252] In embodiments of this disclosure, a user equipment (UE) is provided. The UE includes a processor, a memory coupled to the processor, and a first controller communicatively coupled to the memory and the processor. The first controller receives scheduling information for the Physical Downlink Shared Channel (PDSCH) via a Physical Downlink Control Channel (PDCCH) Downlink Control Information (DCI) format before a predetermined time threshold (duration of the QCL). The PDCCH DCI format includes a scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. Furthermore, the first controller determines whether the UE is capable of handling a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2). Additionally, if the UE can only handle a single default beam in FR2, the first controller determines, based on two indicated TCI states, whether at least one of an Intra-Cell Multiple Transmitter Receiver Point (MTRP) multi-DCI mode and an Intra-Cell MTRP single-DCI mode is a joint TCI mode or a separate TCI mode.

[0253] In embodiments of this disclosure, a user equipment (UE) is provided. The UE includes a processor, a memory coupled to the processor, and a second controller communicatively coupled to the memory and the processor. When the UE can only process a single default beam in frequency range 2 (FR2), the second controller determines, based on two indicated TCI states, whether at least one of an inter-cell MTRP multi-DCI mode and an inter-cell MTRP single-DCI mode is a joint TCI mode or a single TCI mode. Furthermore, when the first indicated TCI state belongs to the serving cell and the second indicated TCI state contains QCL information having a PCID different from the physical cell ID (PCID) of the serving cell, the second controller selects the first indicated TCI state as the default indicated TCI state. Additionally, when the second indicated TCI state belongs to the serving cell and the first indicated TCI state contains QCL information having a PCID different from the PCID of the serving cell, the second controller selects the second indicated TCI state as the default indicated TCI state.

Claims

1. A method performed by a user equipment (UE) (302) when multiple indicated TCI states are configured, the method comprising: Before a predetermined time threshold, scheduling information for the Physical Downlink Shared Channel (PDSCH) is received via the Physical Downlink Control Channel (PDCCH) Downlink Control Information (DCI) format, wherein the PDCCH DCI format includes the scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. Determine whether the UE (302) is capable of handling a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2); and In cases where the UE (302) can only process a single default beam in FR2, the system determines whether at least one of the Intra-Cell Multiple Transmit / Receive Point (MTRP) Multi-DCI mode and Intra-Cell MTRP Single-DCI mode is a joint TCI mode or a separate TCI mode based on the two indicated TCI states.

2. The method according to claim 1, wherein, Determining the MTRP multi-DCI mode as a joint TCI mode or a single TCI mode based on the TCI status of the two indications includes: Determine whether the MTRP multi-DCI mode is set to joint TCI mode or individual TCI mode, and whether the two indicated TCI states are configured as a first joint or downlink (DL) TCI state and a second joint or DL ​​TCI state; and When the MTRP multi-DCI mode is set to either the combined TCI mode or the individual TCI mode, and the TCI states of the two indications are configured as the first combined or DL ​​TCI state and the second combined or DL ​​TCI state, the TCI state indicated by CORESET pool index 0 is selected as the default TCI state indicated for PDSCH reception.

3. The method according to claim 1, comprising: When the MTRP multi-DCI mode is set to joint TCI mode or individual TCI mode and the two indicated TCI states are configured as a first joint or DLTCI state and a second joint or DLTCI state, the first joint or DLTCI state is selected as the default indicated TCI state for PDSCH reception.

4. The method according to claim 1, comprising: When the MTRP mode is set to either the combined TCI mode or the individual TCI mode and the two indicated TCI states are configured as the first combined or DL ​​TCI state and the second combined or DL ​​TCI state, the second combined or DL ​​TCI state is selected as the default indicated TCI state for PDSCH reception.

5. The method according to claim 1, comprising: Configure the TCI state for the default indication of PDSCH reception via Radio Resource Control (RRC) signaling or Media Access Control Element (MAC-CE) signaling; as well as Based on the PDCCH sent to the UE (302) in the CORESET, the default indicated TCI state is selected per component carrier (CC) or per bandwidth portion (BWP) via RRC signaling or MAC-CE signaling.

6. The method according to claim 1, wherein, The default TCI state is selected based on the lowest CORESET ID among the multiple CORESETs configured for the UE (302).

7. The method according to claim 1, comprising: Select the default indicated TCI state associated with the CORESET pool index value set to 1 for PDSCH reception.

8. A method performed by a user equipment (UE) (302) when multiple TCI states are indicated, the method comprising: In the case that the UE (302) can only process a single default beam in frequency range 2 (FR2), determine whether at least one of the inter-cell MTRP multi-DCI mode and inter-cell MTRP single-DCI mode is a joint TCI mode or a separate TCI mode based on the two indicated TCI states. Perform one of the following: If the TCI state indicated by the first indication belongs to the serving cell and the TCI state indicated by the second indication contains QCL information with a PCID that is different from the physical cell ID (PCID) of the serving cell, the TCI state indicated by the first indication is selected as the default TCI state indicated. as well as If the TCI state indicated by the second indication belongs to the serving cell and the TCI state indicated by the first indication contains QCL information with a PCID different from the PCID of the serving cell, the TCI state indicated by the second indication is selected as the default TCI state indicated.

9. The method according to claim 8, wherein, The default TCI status is either the TCI status indicated by the serving cell or the TCI status indicated by not including the PCID in the QCL information.

10. The method of claim 8, comprising: Configure the TCI state for the default indication of PDSCH reception via Radio Resource Control (RRC) signaling or Media Access Control Element (MAC-CE) signaling; as well as Based on the CORESET associated with the serving cell in which the PDCCH is sent to the UE (302), the default indicated TCI state is selected as the first indicated TCI state or the second indicated TCI state per component carrier (CC) or per bandwidth portion (BWP) via RRC signaling or MAC-CE signaling.

11. The method according to claim 9, in, The default indication TCI state associated with the serving cell in the inter-cell MTRP MDCI has a CORESET pool index value of 0, and The TCI state associated with the serving cell for PDSCH reception has a CORESET pool index value of 1.

12. The method of claim 8, comprising: Determine whether the TCI state with the default indication of CORESET pool index value 0 is associated with a PCI that is different from the PCI of the serving cell; as well as The Rel-15 default QCL assumption is applied to both non-UE dedicated PDSCH and UE dedicated PDSCH.

13. The method according to claim 12, wherein, Determining whether the TCI state with the default indication of CORESET pool index 0 is associated with a PCI that is different from the PCI of the serving cell includes: Determine whether the QCL properties of the default beam in the CC time slot of FR1 are different; and The default indicated TCI state is selected based on the lowest CORESET ID in the latest time slot among the multiple CCs configured for the UE (302).

14. The method of claim 8, comprising: Determine whether the default indicated TCI status belongs to the serving cell; as well as The TCI state for selecting between non-UE dedicated PDSCH and UE dedicated PDSCH.

15. A user equipment (UE) (302) for determining a default TCI state for Physical Downlink Shared Channel (PDSCH) reception when multiple indicated Transmission Configuration Indicator (TCI) states are configured, the UE (302) comprising: Processor (304); Memory (306); A first controller (310) is communicatively coupled to a processor (304) and a memory (306), wherein the first controller (310): Before a predetermined time threshold (the duration of the QCL), scheduling information for the Physical Downlink Shared Channel (PDSCH) is received via the Physical Downlink Control Channel (PDCCH) Downlink Control Information (DCI) format, wherein the PDCCH DCI format includes the scheduling offset between the last symbol of the PDCCH and the first symbol of the PDSCH. Determine whether the UE (302) is capable of handling a single default beam in frequency range 1 (FR1) or frequency range 2 (FR2); and In cases where the UE (302) can only process a single default beam in FR2, the system determines whether at least one of the Intra-Cell Multiple Transmit / Receive Point (MTRP) Multi-DCI mode and Intra-Cell MTRP Single-DCI mode is a joint TCI mode or a separate TCI mode based on the two indicated TCI states.

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