Device and method for handling search space set groups and transmission configuration indicator states - Patents.com

Abstract

To provide a communication device for handling a search space set group (SSSG) and a transmission configuration indicator (TCI) state.SOLUTION: In a wireless communication system, a communication device for monitoring and switching SSSG is configured to perform SSSG switching according to first downlink control information (DCI) for the SSSG switching when monitoring one of a first SSSG and a second SSSG according to an instruction for receiving the first SSSG associated with one TCI state and the second SSSG associated with multiple TCI states from a network, and an instruction for monitoring one of the first SSSG and the second SSSG.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to devices and methods for use in wireless communication systems, and more particularly to devices and methods for handling search space set group (SSSG) and transmission configuration indicator (TCI) states. [Background technology]

[0002] The Long Term Evolution (LTE) system, which supports the 3GPP® (3rd Generation Partnership Project) Rel-8 and / or 3GPP® Rel-9 standards, was developed by 3GPP® as the successor to the Universal Mobile Telecommunications System (UMTS) to further enhance the performance of UMTS to meet growing user needs. The LTE system includes a new radio interface and a new radio network architecture that provides higher data rates, lower latency, packet optimization, and improved system capacity and coverage. The LTE-Advanced (LTE-A) system, as its name suggests, is an evolution of the LTE system. The LTE-A system targets faster switching between power states, improves performance at the coverage edge of evolved Node Bs (eNBs), increases peak data rates and throughput, and includes advanced technologies such as carrier aggregation (CA), coordinated multipoint (CoMP) transmit / receive, uplink (UL) multiple-input multiple-output (UL-MIMO), and licensed-assisted access (LAA) (e.g., using LTE).

[0003] The Next Generation Radio Access Network (NG-RAN) is being developed to further enhance the LTE-A system. NG-RAN includes one or more Next Generation Node Bs (gNBs) and has characteristics such as wider operating bands, different numerologies for different frequency ranges, massive MIMO, and advanced channel coding. NG-RAN supports multiple connections, high capacity, and ultra-low latency. Such diverse scenarios require a disruptive approach to realize the NR system. Multiple Transmit Receive Points (TRPs) are important in the NR system to improve reliability, coverage, and capacity performance through flexible deployment scenarios.

[0004] In an NR system, dynamic switching between single TRP and multi-TRP is required for high-mobility user equipment (UE). However, single TRP and multi-TRP configured by the radio resource control (RRC) and / or medium access control (MAC) control element (CE) cannot be dynamically switched. Search space set group (SSSG) monitoring and transmission configuration indicator (TCI) status are expected to realize dynamic switching between single TRP and multi-TRP. Therefore, how to handle the SSSG and TCI status is an important issue to be resolved. Summary of the Invention

[0005] SUMMARY OF THE INVENTION Therefore, the present invention provides a communication device and method for handling search space set group (SSSG) and transmission configuration indicator (TCI) states to solve the above-mentioned problems.

[0006] 1. A communications device for monitoring and switching search space set groups (SSSGs), the communications device comprising: at least one storage device; and at least one processing circuit coupled to the at least one storage device, wherein the at least one storage device stores instructions, and the at least one processing circuit is configured to execute the following instructions: receive configurations of a first SSSG and a second SSSG from a network, the first SSSG being associated with one transmission configuration indicator (TCI) state and the second SSSG being associated with multiple TCI states; monitor one of the first SSSG and the second SSSG according to the configurations; receive first downlink (DL) control information (DCI) for SSSG switching from the network while monitoring one of the first SSSG and the second SSSG according to the configurations; and perform SSSG switching according to the first DCI.

[0007] A network for monitoring and switching search space set groups (SSSGs), comprising: at least one storage device; and at least one processing circuit coupled to the at least one storage device, wherein the at least one storage device stores instructions, and the at least one processing circuit is configured to execute the following instructions: receive instructions to generate configurations of a first SSSG and a second SSSG, the first SSSG being associated with one transmission configuration indicator (TCI) state and the second SSSG being associated with multiple TCI states; transmit the configurations to a communication device; generate first downlink (DL) control information (DCI) for SSSG switching; and transmit the first DCI to the communication device.

[0008] 1. A communications device for indicating and applying a transmission configuration indicator (TCI) state, the communications device including: at least one storage device; and at least one processing circuit coupled to the at least one storage device, wherein the at least one storage device stores instructions, and the at least one processing circuit is configured to execute the instructions to receive downlink (DL) control information from a network via a control resource set (CORESET), the DCI including a TCI field, the TCI field indicating a TCI codepoint corresponding to at least one of a first TCI state or a second TCI state.

[0009] A network for indicating and applying a transmission configuration indicator (TCI) state, comprising: at least one storage device; and at least one processing circuit coupled to the at least one storage device, wherein the at least one storage device stores instructions, and the at least one processing circuit is configured to execute instructions for generating downlink (DL) control information (DCI) and transmitting the DCI via a control resource set (CORESET) to a communication device, the DCI including a TCI field, the TCI field indicating a TCI codepoint corresponding to at least one of a first TCI state or a second TCI state, the communication device.

[0010] These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a schematic diagram of a wireless communication system according to an example of the present invention; [Figure 2] 1 is a schematic diagram of a communication device according to an example of the present invention. [Figure 3] 1 is a flowchart of a process according to an example of the present invention. [Figure 4] 1 is a flowchart of a process according to an example of the present invention. [Figure 5] 1 is a flowchart of a process according to an example of the present invention. [Figure 6] 1 is a flowchart of a process according to an example of the present invention. [Figure 7] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 8] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 9] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 10] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 11] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 12] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 13] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 14] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 15] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 16] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 17] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 18] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 19] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 20] 1 is a schematic diagram of TCI code points of a TCI field in a DCI according to an example of the present invention. [Figure 21] 1 is a schematic diagram of TCI code points of a TCI field in a DCI according to an example of the present invention. [Figure 22] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 23] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. [Figure 24] FIG. 1 is a schematic diagram of a scenario for handling SSSG and TCI situations according to an example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] FIG. 1 is a schematic diagram of a wireless communication system 10 according to an example embodiment of the present invention. The wireless communication system 10, briefly, comprises a network 12 and multiple communication devices 14. The wireless communication system 10 may support a time division duplexing (TDD) mode, a frequency division duplexing (FDD) mode, a TDD-FDD joint operation mode, a non-terrestrial network (NTN) mode, or a licensed assisted access (LAA) mode. That is, the network 12 and the communication devices 14 may communicate with each other via an FDD carrier, a TDD carrier, a licensed carrier (licensed serving cell), and / or an unlicensed carrier (unlicensed serving cell). Additionally, the wireless communication system 10 may support carrier aggregation (CA). That is, the network 12 and the communication devices 14 may communicate with each other via multiple serving cells (e.g., multiple serving carriers), including a primary cell (e.g., a primary component carrier) and one or more secondary cells (e.g., secondary component carriers).

[0013] FIG. 1 briefly illustrates the structure of the wireless communication system 10, using a network 12 and communication devices 14. In practice, the network 12 may be a Universal Terrestrial Radio Access Network (UTRAN) including at least one Node B (NB) in a Universal Mobile Telecommunications System (UMTS). In one example, the network 12 may be an Evolved UTRAN (E-UTRAN) including at least one Evolved NB (eNB) and / or at least one relay node in a Long Term Evolution (LTE) system, an LTE-Advanced (LTE-A) system, an evolution of an LTE-A system, or the like. In one example, the network 12 may be a Next Generation Radio Access Network (NG-RAN) including at least one Next Generation Node B (gNB) and / or at least one Fifth Generation (5G) Base Station (BS). In one example, a gNB or a 5G BS of the network 12 may include a NTN gateway and a NTN payload. In one example, the network 12 may be any BS conforming to a particular communication standard for communicating with communication devices.

[0014] New Radio (NR) is a standard defined for 5G systems (or 5G networks) to provide a unified air interface with better performance. gNBs are deployed to realize 5G systems that support advanced features such as enhanced Mobile Broadband (eMBB), Ultra Reliable Low Latency Communications (URLLC), and Massive Machine Type Communications (mMTC). eMBB provides broadband services with high bandwidth and low / moderate latency. URLLC provides applications (e.g., end-to-end communications) with higher reliability and low latency characteristics. Example applications include the Industrial Internet, smart grids, infrastructure protection, remote surgery, and intelligent transportation systems (ITS). mMTC can support the Internet of Things (IoT) in 5G systems, which includes billions of connected devices and / or sensors.

[0015] Furthermore, the network may also include at least one of a UTRAN / E-UTRAN / NG-RAN and a core network, and the core network may include network entities such as a Mobility Management Entity (MME), a Serving Gateway (S-GW), a Packet Data Network Gateway (P-GW), a Self-Organizing Networks (SON) server and / or a Radio Network Controller (RNC), an Access and Mobility Management Function (AMF), a Session Management Function (SMF), a User Plane Function (UPF), and an Authentication Server Function (AUSF). In one example, after the network 12 receives information transmitted by the communication device 14, the information may be processed only by the UTRAN / E-UTRAN / NG-RAN, and a decision corresponding to the information is made in the UTRAN / E-UTRAN / NG-RAN. In one example, the UTRAN / E-UTRAN / NG-RAN may forward the information to the core network, and after the core network processes the information, a decision corresponding to the information is made in the core network. In one example, the information may be processed by both the UTRAN / E-UTRAN / NG-RAN and the core network, and the decision is made after coordination and / or cooperation is performed by the UTRAN / E-UTRAN / NG-RAN and the core network.

[0016] Additionally, the network 12 may include a service provider and at least one base transceiver station (BTS). The service provider may be an organization that provides services (e.g., consulting, legal, real estate, communications, storage, and processing services). The at least one BTS may be at least one NB, at least one eNB, at least one gNB, and / or at least one 5G BS. The service provider may transmit service data to the BTS, and the BTS may forward the service data to the communication device 14. In one example, the service data may be service information such as internet security, ringtones, e-books, daily life applications, bill collection, etc. In one example, the service data may be video data and / or audio data (e.g., having a format h.265, h.266, or AV1, or compliant with MPEG-4 (Moving Picture Experts Group 4)). In one example, the service data may be data for augmented reality (AR), virtual reality (VR), mixed reality (MR), and / or extended reality (XR). The service provider may generate corresponding data according to data related to the communication device 14 (eg, the geographic location of the communication device 14, the Bluetooth information of the communication device 14, the information of the communication device 14 stored by the service provider).

[0017] The communication device 14 may be a user equipment (UE), a very small aperture terminal (VSAT), a low-cost device (e.g., a machine-type communication (MTC) device), a device-to-device (D2D) communication device, a narrowband Internet of Things (IoT) (NB-IoT), a mobile phone, a laptop, a tablet computer, an e-book, a portable computer system, or a combination thereof. Additionally, the network 12 and the communication device 14 may be viewed as a transmitter or a receiver according to the direction (e.g., transmission direction), e.g., in the uplink (UL), the communication device 14 is the transmitter and the network 12 is the receiver, and in the downlink (DL), the network 12 is the transmitter and the communication device 14 is the receiver.

[0018] 2 is a schematic diagram of a communication device 20 according to an example of the present invention. The communication device 20 may be, but is not limited to, the communication device or network shown in FIG. 1. The communication device 20 may include at least one processing circuit 200, such as a microprocessor or an application-specific integrated circuit (ASIC), at least one storage device 210, and at least one communication interface device 220. The at least one storage device 210 may be any data storage device capable of storing program code 214 that is accessed and executed by the at least one processing circuit 200. Examples of the at least one storage device 210 include, but are not limited to, a subscriber identity module (SIM), a read-only memory (ROM), a flash memory, a random access memory (RAM), a compact disc read-only memory (CD-ROM), a digital versatile disc ROM (DVD-ROM), a Blu-ray disc ROM (BD-ROM), a magnetic tape, a hard disk, an optical data storage device, a non-volatile storage device, a non-transitory computer-readable medium, etc. The at least one communication interface device 220 is preferably at least one transceiver and is used to transmit and receive signals (e.g., data, messages and / or packets) according to the processing results of the at least one processing circuit 200.

[0019] 3 is a flowchart of a process 30 according to an example of the present invention. The process 30 may be utilized in a communication device (e.g., communication device 14 of FIG. 1 or communication device 20 of FIG. 2) to monitor and switch search space set groups (SSSGs). The process 30 may be compiled into program code 214 and includes the following steps: Step 300: Start. Step 302: Receive a first SSSG and a second SSSG configuration from the network, where the first SSSG is associated with one transmission configuration indicator (TCI) state and the second SSSG is associated with multiple TCI states. Step 304: Monitor one of the first SSSG and the second SSSG according to the setting. Step 306: Receive a first downlink DL control information (DCI) for SSSG switching from the network when monitoring one of the first SSSG and the second SSSG according to the configuration. Step 308: Perform SSSG switching according to the first DCI. Step 310: End.

[0020] According to process 30, a communication device receives a configuration of a first SSSG and a second SSSG from a network, where the first SSSG is associated with one TCI state and the second SSSG is associated with multiple TCI states. The communication device is configured to have the first SSSG and the second SSSG. Then, the communication device monitors one of the first SSSG and the second SSSG according to the configuration, and receives a first DCI for SSSG switching from the network when monitoring either the first SSSG or the second SSSG according to the configuration. The communication device performs SSSG switching according to the first DCI. That is, the SSSG switching is performed according to the configuration and the DCI received from the network. Thus, dynamic switching between single TRP and multi-TRP can be realized according to the SSSG switching.

[0021] The implementation of the process 30 is not limited to the above. The following example can be applied to implement the process 30.

[0022] In one example, a first SSSG is associated with at least one control resource set (CORESET), and each of the at least one CORESET is associated with one TCI state (e.g., activated or indicated). In one example, a second SSSG is associated with a CORESET, and the CORESET is associated with multiple TCI states (e.g., activated or indicated). In one example, a second SSSG is associated with multiple CORESETs, and the multiple CORESETs are each associated with multiple TCI states (e.g., activated or indicated).

[0023] In one example, the first DCI includes a field. Step 308 further includes the communication device switching to the first SSSG when the field indicates one TCI state and monitoring the first SSSG according to the TCI state. Step 308 further includes the communication device switching to the second SSSG when the field indicates multiple TCI states and monitoring the second SSSG according to the multiple TCI states.

[0024] In one example, the first DCI includes a first field and a second field. Further, step 308 includes the communication device switching to the first SSSG when the first field indicates a TCI state and the second field indicates a first SSSG and monitoring the first SSSG according to the TCI state. Step 308 further includes switching to the second SSSG when the first field indicates multiple TCI states and the second field indicates a second SSSG and monitoring the second SSSG according to the multiple TCI states.

[0025] In one example, the first DCI includes a first field and a second field. Further, step 308 includes the communication device switching to the second SSSG when the first field indicates one TCI state and the second field indicates a second SSSG and monitoring the second SSSG according to the TCI state. In particular, the communication device monitors a first subgroup of the second SSSG and a second subgroup of the second SSSG according to the TCI state. In one example, at least one first search space (SS) set in the first subgroup corresponds to at least one second SS set in the second subgroup. In one example, the first CORESET associated with the first subgroup and the second CORESET associated with the second subgroup are associated with the same TCI state.

[0026] In one example, the communication device transmits information to the network. The information may include a moving direction, a speed, and / or a location of the communication device. In one example, the first DCI includes a first field and a second field indicating a time period. Further, step 308 includes the communication device switching to the first SSSG at the end of the time period when the first field indicates one TCI state and monitoring the first SSSG according to the TCI state. Step 308 further includes the communication device switching to the second SSSG at the end of the time period when the first field indicates multiple TCI states and monitoring the second SSSG according to the multiple TCI states. In one example, the time period is between a first moment of receiving the first DCI from the network and a second moment of performing the SSSG switch. In one example, the time period is between a first moment of transmitting Hybrid Automatic Repeat Request (HARQ) feedback corresponding to the first DCI and a second moment of performing the SSSG switch.

[0027] In one example, the first DCI includes a field indicating a time period. Step 308 further includes, when the communication device is monitoring the second SSSG, switching to the first SSSG at the end of the time period and monitoring the first SSSG according to its TCI state. Step 308 further includes, when the communication device is monitoring the first SSSG, switching to the second SSSG at the end of the time period and monitoring the second SSSG according to the TCI state.

[0028] In one example, step 308 includes starting a timer when the communication device receives a first DCI from the network and monitors a second SSSG associated with a plurality of TCI states. Step 308 includes the communication device switching to a default SSSG and monitoring the default SSSG according to one of the plurality of TCI states when the timer expires. Step 308 further includes re-starting the timer when the communication device receives a second DCI from the network and monitors the second SSSG associated with the plurality of TCI states. In one example, the default SSSG is predetermined (e.g., the SSSG with the lowest index) or indicated by the network.

[0029] In one example, the first DCI includes a first field indicating a plurality of TCI states and a second field indicating a time period. Further, step 308 includes the communication device monitoring the first SSSG according to one of the plurality of TCI states (e.g., a default TCI state). Step 308 further includes the communication device switching to a second SSSG at the end of the time period and monitoring the second SSSG according to the plurality of TCI states. In one example, the one of the plurality of TCI states is predetermined (e.g., by the network) or indicated by a media access control (MAC) control element.

[0030] In one example, the first DCI includes a first field indicating one of a plurality of TCI states and a second field indicating a first time period. Further, step 308 includes the communication device monitoring the first SSSG according to the one of the plurality of TCI states. Step 308 further includes the communication device receiving a second DCI. The second DCI includes a third field indicating a plurality of TCI states and a fourth field indicating a second time period. Step 308 further includes the communication device switching to a second SSSG at an end of the second time period and monitoring the second SSSG according to the plurality of TCI states. In one example, the end of the first time period and the end of the second time period are the same instant.

[0031] In one example, the first DCI includes a first field and a second field. Further, step 308 includes, when the first field indicates one TCI state and the second field indicates that a first SSSG monitoring associated with the first value of the CORESET pool index is disabled, the communication device switching to the first SSSG and monitoring the first SSSG according to the TCI state. Step 308 further includes, when the first field indicates multiple TCI states and the second field indicates that a second SSSG monitoring associated with the second value of the CORESET pool index is enabled, switching to a second SSSG and monitoring the second SSSG according to the multiple TCI states. In one example, the first DCI is associated with one of the first CORESET pool index and the second CORESET pool index. In one example, the communication device receives the first DCI from a network (e.g., a transmission / reception point of the network) indicated by one of the first CORESET pool index and the second CORESET pool index.

[0032] In one example, the first DCI includes a field indicating a TCI state. Further, step 308 includes the communication device switching to the first SSSG when the field indicates a TCI state and monitoring the first SSSG according to the TCI state. In one example, the first DCI is associated with a CORESET pool index. In one example, the communication device receives the DCI from a network (e.g., a TRP of the network) indicated by the CORESET pool index. In one example, the (first) field indicating the TCI state or states is a TCI field having a TCI codepoint.

[0033] 4 is a flowchart of a process 40 according to an example of the present invention. The process 40 may be used in a network (e.g., the network 12 of FIG. 1 or the communication device 20 of FIG. 2) to monitor and switch SSSGs. The process 40 may be compiled into the program code 214 and includes the following steps: Step 400: Start. Step 402: Generate a configuration of a first SSSG and a second SSSG, where the first SSSG is associated with one TCI state and the second SSSG is associated with multiple TCI states. Step 404: Send the configuration to the communication device. Step 406: Generate a first DCI for SSSG switching. Step 408: Send a first DCI to the communication device. Step 410: End.

[0034] According to process 40, the network generates a first SSSG and a second SSSG configuration and transmits the configuration to the communication device. The first SSSG is associated with one TCI state, and the second SSSG is associated with multiple TCI states. The network then generates a first DCI for SSSG switching and transmits the first DCI to the communication device. That is, the communication device may perform SSSG switching according to its configuration and the DCI received from the network. Thus, dynamic switching between single TRP and multi-TRP can be realized according to the SSSG switching.

[0035] The implementation of the process 40 is not limited to the above. The following example can be applied to implement the process 40.

[0036] In one example, the first DCI includes a first field indicating one TCI state or multiple TCI states. In one example, the first DCI further includes a second field indicating a time period. In one example, the time period is between a first moment when the communication device receives the first DCI from the network and a second moment when the communication device performs SSSG switching. In one example, the time period is between a first moment when the communication device transmits HARQ feedback corresponding to the first DCI and a second moment when the communication device performs SSSG switching. Alternatively, the first DCI further includes a second field indicating that first SSSG monitoring associated with the first CORESET pool index is disabled or that second SSSG monitoring associated with the second CORESET pool index is enabled. In one example, the first DCI is associated with one of a first CORESET pool index and a second CORESET pool index. In one example, the first DCI is transmitted to the communication device from a network indicated by one of the first CORESET pool index and the second CORESET pool index. Alternatively, the first DCI further includes a second field indicating the first SSSG or the second SSSG.

[0037] In one example, the first DCI includes a field indicating a time period. In one example, the network generates a second DCI for SSSG switching and transmits the second DCI to the communication device. In one example, the first DCI includes a first field indicating one of a plurality of TCI states and a second field indicating the first time period, and the second DCI includes a third field indicating the plurality of TCI states and a fourth field indicating the second time period. In one example, the end of the first time period and the end of the second time period are the same instant.

[0038] Examples of method 30 may be applied to method 40 and will not be described here for the sake of brevity.

[0039] 5 is a flowchart of a process 50 according to one example of the present invention. The process 50 may be utilized in a communication device (e.g., communication device 14 of FIG. 1 or communication device 20 of FIG. 2) to indicate and apply a TCI state. The process 50 may be compiled into program code 214 and includes the following steps: Step 500: Start. Step 502: Receive DCI from the network via CORESET. Step 504: End.

[0040] According to the process 50, the communication device receives a DCI from the network via CORESET. The DCI includes a TCI field, and the TCI field indicates a TCI codepoint corresponding to at least one of a first TCI state or a second TCI state. Therefore, dynamic switching between single TRP and multi-TRP can be realized according to at least one of the first TCI state or the second TCI state.

[0041] The implementation of the process 50 is not limited to the above. The following example can be applied to implement the process 50.

[0042] In one example, the first TCI state is a DL TCI state or an uplink ULTCI state, and the second TCI state is a DL TCI state or an UL TCI state. In one example, a CORESET is configured to have at least one TCI state indicated by a DCI, and the at least one TCI state includes at least one of the first TCI state or the second TCI state. In one example, a communication device receives at least one physical DL control channel (PDCCH) from a network in accordance with the at least one TCI state via the CORESET. A demodulation reference signal (DM-RS) antenna port for receiving the at least one PDCCH via the CORESET is quasi-co-located (QCLed) with the multiple RSs provided by the at least one TCI state.

[0043] In one example, the CORESET is associated with at least one of a plurality of UE-specific search space (USS) sets or a plurality of PDCCH common search space (CSS) sets. The plurality of PDCCH CSS sets may be, but are not limited to, Type 3-PDCCH CSS sets. In one example, the CORESET is configured to have a value of a CORESET pool index, and the value of the CORESET pool index is associated with at least one of a first TCI state or a second TCI state. In one example, the first DCI is included in an SSSG. In one example, the TCI field indicates at least one of a first TCI state or a second TCI state in a component carrier (CC) set or a bandwidth portion (BWP) set in a CC list. In one example, the communication device receives, from a network, an activation command for mapping a plurality of TCI states to at least one TCI code point in the TCI field.

[0044] In one example, the communication device further includes transmitting a physical UL control channel (PUCCH) to the network according to a spatial setting associated with the at least one TCI state, where the at least one TCI state includes at least one of a first TCI state or a second TCI state. In one example, the TCI codepoint is associated with a value of a CORESET pool index. In one example, if the TCI codepoint corresponds to the first TCI state and the second TCI, the first TCI state and the second TCI are associated with the same value of the CORESET pool index. In one example, the communication device transmits a PUCCH to the network corresponding to a DCI that includes a TCI state indication, where a last symbol of the PUCCH includes HARQ feedback. In one example, the communication device starts applying at least one of the first TCI state or the second TCI state indicated by the TCI field from at least the slot that is the time relative to the beam application symbol after the last symbol of the PUCCH, if at least one of the first TCI state or the second TCI state is different from the previous TCI state indicated in the previous TCI state indication.

[0045] Examples of processes 30-40 may be applied to method 50 and will not be described here for the sake of brevity.

[0046] 6 is a flowchart of a process 60 according to one example of the present invention. The process 60 may be used in a network (e.g., the network 12 of FIG. 1 or the communication device 20 of FIG. 2) to indicate and apply TCI. The process 60 may be compiled into the program code 214 and includes the following steps: Step 600: Start. Step 602: Generate DCI. Step 604: Send the DCI to the communication device via CORESET. Step 606: End.

[0047] According to process 60, the network generates a DCI and transmits the DCI to the communication device via CORESET. The DCI includes a TCI field, and the TCI field indicates a TCI codepoint corresponding to at least one of a first TCI state or a second TCI state. That is, the communication device receives the DCI indicating at least one of the first TCI state or the second TCI state. Therefore, dynamic switching between single TRP and multi-TRP can be realized according to at least one of the first TCI state or the second TCI state.

[0048] The implementation of the process 50 is not limited to the above. The following example can be applied to implement the process 50.

[0049] In one example, the first TCI state is a DL TCI state or an uplink ULTCI state, and the second TCI state is a DL TCI state or an UL TCI state. In one example, a CORESET is configured to have at least one TCI state indicated by the DCI, and the at least one TCI state includes at least one of the first TCI state or the second TCI state. In one example, the network transmits at least one PDCCH to the communication device according to the at least one TCI state via the CORESET. A DM-RS antenna port for receiving the at least one PDCCH via the CORESET is QCLed with multiple RSs provided by the at least one TCI state.

[0050] In one example, the CORESET is associated with at least one of a plurality of USS sets or a plurality of PDCCH CSS sets. The plurality of PDCCH CSS sets may be, but are not limited to, Type 3-PDCCH CSS sets. In one example, the CORESET is configured to have a value of a CORESET pool index, and the value of the CORESET pool index is associated with at least one of a first TCI state or a second TCI state. In one example, the first DCI is included in an SSSG. In one example, the TCI field indicates at least one of a first TCI state or a second TCI state in a BWP set in a CC set or a CC list. In one example, the network sends an activation command to the communication device to map the plurality of TCI states to at least one TCI code point in the TCI field.

[0051] In one example, the network receives a PUCCH from the communication device according to a spatial setting associated with at least one TCI state, the at least one TCI state including at least one of a first TCI state or a second TCI state. In one example, the TCI codepoint is associated with a value of a CORESET pool index. In one example, if the TCI codepoint corresponds to the first TCI state and the second TCI, the first TCI state and the second TCI are associated with the same value of the CORESET pool index. In one example, the network receives a PUCCH from the communication device corresponding to a DCI including a TCI state indication, the last symbol of the PUCCH including HARQ feedback. In one example, if at least one of the first TCI state or the second TCI state is different from a previous TCI state indicated by the previous TCI state indication, application of at least one of the first TCI state or the second TCI state indicated by the TCI field starts from a slot that is a time relative to a beam application symbol after the last symbol of the PUCCH.

[0052] Examples of processes 30-50 may be applied to method 60 and will not be described here for the sake of brevity.

[0053] The following examples may be applied to processes 30-60.

[0054] In one example, a DCI (e.g., the first / second DCI in processes 30-40 or the DCI in processes 50-60) is associated with at least one SS set, at least one SS set is associated with at least one CORESET, and at least one CORESET is associated with at least one TCI state (e.g., activated). For example, a DCI is associated with one SS set, the SS set is associated with one CORESET, and the CORESET is activated in a TCI state. For example, a DCI is associated with multiple SS sets, the multiple SS sets are respectively associated with multiple CORESETs, and the multiple CORESETs are respectively activated in multiple TCI states. The multiple SS sets correspond to each other. For example, a DCI is associated with an SS set, the SS set is associated with one CORESET, and the CORESET is activated in multiple TCI states.

[0055] In one example, the CORESET is set to have a value of a CORESET pool index. In one example, the DCI includes a DL allocation. In one example, the DCI does not include a DL allocation. If the DCI does not include a DL allocation, the communication device determines that a Radio Network Temporary Identifier (RNTI) (e.g., CS-RNTI) will be used to scramble a cyclic redundancy check (CRC) for the DCI, and determines a redundancy version (RV) parameter to be '1', a modulation coding scheme (MCS) parameter to be '1', a new data indicator (NDI) to be '0', a frequency domain resource allocation (FDRA) type 0 parameter to be '0', a FDRA type 1 parameter to be '1', and a dynamic switch parameter to be '0'.

[0056] In one example, a communication device is configured by radio resource control (RRC) to have a TCI state configuration list. In one example, when the communication device is configured to have at least one TCI state for the UL, the communication device performs PUSCH transmission with a configured grant. The configured grant is a Type 1 configured grant, a Type 2 configured grant, or a dynamic grant.

[0057] In one example, the communication device transmits (e.g., reports) at least one capability to the network. The at least one capability may indicate whether the communication device supports at least one of the following information: SSSG switching determined by DCI, a timer for switching to a default SSSG, a default TCI state indicated by a MAC CE for monitoring the default SSSG, a predetermined default TCI state for monitoring the default SSSG, an indicator in the DCI for indicating a period for SSSG switching, a TCI state for SSSG switching / monitoring set by RRC, a TCI state for SSSG switching / monitoring indicated by the DCI, enable / disable of SSSG switching associated with a value of a CORESET pool index, and channel / RS grouping by DCI.

[0058] In one example, a TCI codepoint in a TCI field in a DCI indicates two TCI states (e.g., multiple TCI states in processes 30-40, or a first TCI state and a second TCI state in processes 50-60). The two TCI states are associated with two groups of channels / RSs, respectively. The communication device applies the two TCI states in response to the TCI codepoint. In one example, a TCI codepoint in a TCI field in a DCI indicates one TCI state (e.g., a TCI state in processes 30-40, or the first TCI state or the second TCI state in processes 50-60). The one TCI state is associated with two groups of channels / RSs, or is associated with one of the two groups of channels / RSs. The communication device applies the one TCI state in response to the TCI codepoint. In one example, a DCI includes at least one TCI field. The at least one TCI field includes at least one TCI codepoint respectively associated with at least one group of channels / RSs.

[0059] In one example, the channel / RS group includes at least one of the following information: CORESET pool index (value), SS set (index), CORESET (index), PDSCH code division multiplexing (CDM) group (index), PDSCH DM-RS antenna port (index), semi-persistent scheduling (SPS) configuration (index), CSI-RS resource (index), CSI-RS group (index), PUCCH resource group (index), PUCCH resource (index), PUSCH CDM group (index), PUSCH DM-RS antenna port (index), grant configuration (index), sounding reference signal (SRS) resource (index), and SRS group (index).

[0060] In one example, a TCI codepoint of a TCI field in a DCI includes at least one bit and indicates at least one TCI state. Each at least one bit is associated with at least one group of channels / RSs. For example, the TCI codepoint includes four bits “0101” associated with four groups of channels / RSs. In response to a first bit having a “0,” the communication device applies a first TCI state to the first group of channels / RSs, in response to a second bit having a “1,” in response to a second bit having a “1,” in response to a third bit having a “0,” in response to a third group of channels / RSs, in response to a fourth bit having a “1,” in response to a fourth group of channels / RSs, in response to a fourth bit having a “1,” in response to a fourth group of channels / RSs.

[0061] In one example, the number of at least one bit included in the TCI codepoint is determined according to at least one of the following information: the number of at least one CORESET pool index, the number of at least one SS set, the number of at least one CORESET, the number of at least one CDM group of the PDSCH, the number of at least one antenna port of the DM-RS of the PDSCH, the number of at least one SPS configuration, the number of at least one PUCCH resource group (each of the at least one PUCCH resource group includes at least one PUCCH resource), the number of at least one PUCCH resource, the number of at least one CDM group of the PUSCH, the number of at least one antenna port of the DM-RS of the PUSCH, the number of at least one grant configuration, the number of at least one CSI-RS resource, the number of at least one CSI-RS group, the number of at least one SRS resource, and the number of at least one SRS group.

[0062] In one example, the DCI includes a TCI field having a TCI codepoint and a grouping field having a grouping codepoint. The TCI codepoint indicates at least one TCI state among multiple TCI states, and the grouping codepoint indicates at least one group of channels / RSs. Tables 1 and 2 are examples for illustrating the grouping codepoint. For example, assume that the multiple TCI states are TCI states TCI_state_A and TCI_state_B, and the grouping codepoint is "5." According to Table 1, the first group of channels / RSs and the third group of channels / RSs are associated with the TCI state TCI_state_A, and the second group of channels / RSs and the fourth group of channels / RSs are associated with the TCI state TCI_state_B. According to Table 2, the first group of channels / RSs and the second group of channels / RSs are associated with the TCI state TCI_state_A, and the first group of channels / RSs is associated with the TCI state TCI_state_B.

[0063] [Table 1] [Table 2]

[0064] In one example, the DCI includes a TCI field having a TCI codepoint, a first grouping field having a first grouping codepoint, and a second grouping field having a second grouping codepoint. The TCI codepoint indicates at least one TCI state of a plurality of TCI states. The first grouping codepoint indicates at least one group of channels / RSs associated with a first of the plurality of TCI states. The grouping codepoint indicates at least one group of channels / RSs associated with a second of the plurality of TCI states. Tables 3 and 4 are examples illustrating the first and second grouping codepoints, respectively. For example, assume that the plurality of TCI states are TCI states TCI_state_C and TCI_state_D, the first grouping codepoint is "4," and the second grouping codepoint is "6." According to Tables 3 and 4, the first group of channels / RS and the second group of channels / RS are associated with TCI state TCI_state_C, and the second group of channels / RS and the third group of channels / RS are associated with TCI state TCI_state_D.

[0065] [Table 3] [Table 4]

[0066] Tables 1 to 4 show examples of grouping code points and are not intended to limit the present invention.

[0067] In one example, the above-mentioned SSSG (e.g., the first SSSG or the second SSSG) may be, but is not limited to, a search space group (SSSG), a CORESET, a CORESET pool index, or a CORESET group. In one example, the state index or identity (ID) may be, but is not limited to, a CORESET pool index, a TRP ID, or a panel ID. In one example, a communication device may be configured to have the following for multiple TRPs: a set of CORESET pool indexes, a set of TRPs, and a set of panels.

[0068] Figure 7 is a schematic diagram of a scenario 70 for handling SSSG and TCI situations according to an example of the present invention, which can be applied to Figures 1 to 6. In FIG. 7, there is a communication device CD and a network (not shown) having two TRPs TRP1-TRP2. TRP TRP1 includes beams B1-B2, and TRP TRP2 includes beams B3-B4. TCI states TCI1-TCI4 and SSSGs SSSG1-SSSG2 are used to perform single-TPR or multi-TPR operations. TCI states TCI1-TCI4 are associated with beams B1-B4, respectively. SSSG SSSG1 is associated with one of TCI states TCI1-TCI4, and SSSG SSSG2 is associated with at least two of TCI states TCI1-TCI4. The communication device CD moves from left to right according to a movement direction arrow A. The movement direction arrow A has location points P1-P4. The communication device CD performs a single TPR operation with TRP TRP1 between location points P1 and P2, a multi TPR operation with TRP TRP1 and TRP2 between location points P2 and P3, and a single TPR operation with TRP TRP2 between location points P3 and P4. Additionally, the time dimension T has instants TI1 to TI3 and a period TP1.

[0069] 7, between location points P1 and P2 (e.g., before instant TI3), the communication device CD performs single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI1). At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. At instant TI2, the communication device CD transmits a PUCCH PUCCH1 with HARQ feedback corresponding to the DCI DCI1 to the TRP TRP1.

[0070] In one example, the DCI DCI1 includes a TCI field (or TCI indication) having a TCI codepoint indicating the TCI states TCI2-TCI3. At the instant TI3, the communication device CD switches to the SSSG SSSG2 in response to the TCI fields indicating at least two of the TCI states TCI1-TCI4.

[0071] In one example, DCI DCI1 includes a TCI field (or TCI indication) having a TCI codepoint indicating a TCI state TCI2-TCI3, and includes an SSSG switch field indicating SSSG2. At instant TI3, the communication device CD switches to the SSSG SSSG2 in response to the SSSG switch field indicating SSSG2.

[0072] Therefore, between location points P2 and P3 (e.g., after instant TI3), the communication device CD performs multi-TPR operation with TRPs TRP1 to TRP2 according to TCI states TCI2 to TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 to TCI3). Additionally, the period TP1 from instant TI2 to instant TI3 is a time for beam application. After the period TP1 from the last symbol of PUCCH PUCCH1, the communication device CD applies TCI states TCI2 to TCI3 indicated by DCI DCI1 and / or switches SSSGs.

[0073] Figure 8 is a schematic diagram of a scenario 80 for handling SSSG and TCI situations according to an example of the present invention. Figure 8 can be applied to Figures 1 to 7. In Fig. 8, the communication device CD, the network (not shown) with two TRPs TRP1-TRP2, the beams B1-B4, the TCI states TCI1-TCI4, the SSSGs SSSG1-SSSG2, the movement direction arrow A and the location points P1-P4 can refer to Fig. 7 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI4-TI6 and a period TP2.

[0074] 8, between location points P2 and P3 (e.g., before moment TI6), the communication device CD performs multi-TPR operation with TRPs TRP1 and TRP2 according to TCI states TCI2 and TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 and TCI3). At moment TI4, the communication device CD receives DCI DCI2 from TRP TRP1 and / or TRP TRP2. At moment TI5, the communication device CD transmits PUCCH PUCCH2 with HARQ feedback corresponding to DCI DCI2 to TRP TRP1 and / or TRP TRP2.

[0075] In one example, the DCI DCI2 includes a TCI field (or TCI indication) having a TCI codepoint indicating the TCI state TCI4. At the instant TI6, the communication device CD switches to the SSSG SSSG1 in response to the TCI field indicating one of the TCI states TCI1 to TCI4.

[0076] In one example, DCI DCI2 includes a TCI field (or TCI indication) having a TCI codepoint indicating TCI state TCI4 and includes an SSSG switch field indicating SSSG SSSG1. At instant TI6, communication device CD switches to SSSG SSSG1 in response to the SSSG switch field indicating SSSG SSSG1.

[0077] Therefore, between location points P3 and P4 (e.g., after instant TI6), the communication device CD performs a single TPR operation with the TRP TRP2 according to the TCI state TCI4 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI4). Additionally, the period TP2 from instant TI5 to instant TI5 is a time for beam application. After the period TP2 from the last symbol of the PUCCH PUCCH2, the communication device CD applies the TCI state TCI4 indicated by the DCI DCI2 and / or switches the SSSG.

[0078] 9 is a schematic diagram of a scenario 90 for handling SSSG and TCI situations according to an example of the present invention, which can be applied to FIGS. In FIG. 9, there is a communication device CD and a network (not shown) having two TRPs (TRP1-TRP2). TRP TRP1 includes beams B1 and B3, and TRP TRP2 includes beams B2 and B4. TCI states TCI1-TCI4 and SSSGs SSSG1-SSSG2 are used to perform single-TPR or multi-TPR operations. TCI states TCI1-TCI4 are associated with beams B1-B4, respectively. SSSG SSSG1 is associated with one of TCI states TCI1-TCI4, and SSSG SSSG2 is associated with at least two of TCI states TCI1-TCI4. The communication device CD moves from left to right according to a movement direction arrow A. The movement direction arrow A has location points P1-P3. The communication device CD performs a multi-TPR operation with TRPs TRP1-TRP2 (e.g., beam B1 of TRP TRP1 and beam B2 of TRP TRP2) between location points P1-P2, and performs a multi-TPR operation with TRPs TRP1-TRP2 (e.g., beam B3 of TRP TRP1 and beam B4 of TRP TRP2) between location points P2-P3. Additionally, the time dimension T has instants TI1-TI3 and periods TP.

[0079] 9, between location points P1 and P2 (e.g., before instant TI3), the communication device CD performs multi-TPR operation with TRPs TRP1 and TRP2 according to TCI states TCI1 and TCI2 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI1 and TCI2). At instant TI1, the communication device CD receives DCI DCI1 from TRP TRP1 and / or TRP TRP2. At instant TI2, the communication device CD transmits PUCCH PUCCH1 with HARQ feedback corresponding to DCI DCI1 to TRP TRP1 and / or TRP TRP2.

[0080] In one example, the DCI DCI1 includes a TCI field (or TCI indication) having a TCI codepoint indicating the TCI states TCI3 to TCI4. At the instant TI3, the communication device CD does not switch the SSSG SSSG2 in response to the TCI fields indicating at least two of the TCI states TCI1 to TCI4.

[0081] In one example, DCI DCI1 includes a TCI field (or TCI indication) having a TCI codepoint indicating a TCI status TCI3-TCI4, and includes an SSSG switching field indicating SSSG SSSG2. At instant TI3, the communication device CD does not switch SSSG SSSG2 in response to the SSSG switching field in DCI DCI1 indicating SSSG SSSG2.

[0082] Therefore, between location points P2 and P3 (e.g., after instant TI3), the communication device CD performs multi-TPR operation with TRPs TRP1 to TRP2 according to TCI states TCI3 to TCI4 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI3 to TCI4). Additionally, the period TP from instant TI2 to instant TI3 is the time for beam application. After the period TP from the last symbol of PUCCH PUCCH1, the communication device CD applies TCI states TCI3 to TCI4 indicated by DCI DCI1.

[0083] 10 is a schematic diagram of a scenario 100 for handling SSSG and TCI conditions according to an example of the present invention. FIG. 10 can be applied to FIGS. 1 to 9. In FIG. 10, there is a communication device CD and a network (not shown) having two TRPs TRP1-TRP2. TRP TRP1 includes beam B1, and TRP TRP2 includes beam B2. TCI states TCI1-TCI2 and SSSGs SSSG1-SSSG2 are used to perform single-TPR or multi-TPR operation. TCI states TCI1-TCI2 are associated with beams B1-B2, respectively. SSSG SSSG1 is associated with one of TCI states TCI1-TCI2, and SSSG SSSG2 is associated with TCI states TCI1-TCI2. The communication device CD moves from left to right along movement direction arrow A. Movement direction arrow A has location points P1-P4. The coverage of beam B1 includes the area between location points P1-P4, and the coverage of beam B2 includes the area between location points P3-P4. The communication device CD performs a single-TPR operation with TRP TRP1 (e.g., beam B1 of TRP TRP1) between location points P1 and P3, and a multi-TPR operation with TRP TRP1 and TRP2 (e.g., beam B1 of TRP TRP1 and beam B2 of TRP TRP2) between location points P3 and P4. Additionally, the time dimension T has instants TI1 to TI6 and periods TP1 to TP2.

[0084] In FIG. 10, between location points P1 and P2 (e.g., before instant TI3), the communication device CD monitors the subgroup SG1 of the SSSG1 according to the TCI state TCI1. The subgroup SG1 of the SSSG1 is associated with the CORESET CORESET1, which is associated with the TCI state TCI1. At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. The DCI DCI1 includes a TCI field (or a TCI indication) having a TCI codepoint indicating the TCI state TCI1 and an SSSG switch field indicating the SSSG2. At instant TI2, the communication device CD transmits a PUCCH PUCCH1 with HARQ feedback corresponding to the DCI DCI1. At instant TI3, the communication device CD switches to the SSSG2 in response to the SSSG switch field indicating the SSSG2. In particular, between location points P2 and P3 (e.g., between moments TI3 and TI6), the communication device CD monitors subgroups SG2 to SG3 of the SSSG SSSG2 according to the TCI state TCI1. At least one SS set in the subgroup SG2 corresponds to at least one SS set in the subgroup SG3, respectively. The subgroups SG2 to SG3 of the SSSG SSSG2 are associated with CORESETs CORESET2 to CORESET3, respectively, which are associated with the TCI state TCI1.

[0085] 10, at an instant TI4, the communication device CD receives the DCI DCI2 from the TRP TRP1. The DCI DCI2 includes a TCI field (or TCI indication) having a TCI codepoint indicating the TCI state TCI1-TCI2, and includes an SSSG switching field indicating the SSSG SSSG2. At an instant TI5, the communication device CD transmits a PUCCH PUCCH2 having HARQ feedback corresponding to the DCI DCI2. At an instant TI6, the communication device CD does not switch the SSSG SSSG2 in response to the SSSG switching field indicating the SSSG SSSG2. In particular, between location points P3-P4 (e.g., after the instant TI6), the communication device CD monitors the subgroups SG2-SG3 of the SSSG SSSG2 according to the TCI state TCI1-TCI2. The subgroups SG2-SG3 of the SSSG2 are associated with the CORESETs CORESET2-CORESET3, respectively, which are associated with the TCI states TCI1-TCI2, respectively. Additionally, the periods TP1-TP2 in Figure 10 can refer to Figures 7-9 and will not be described herein for the sake of brevity.

[0086] 11 is a schematic diagram of a scenario 110 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. 11, the communication device CD, the network (not shown) with two TRPs TRP1-TRP2, the beams B1-B4, the TCI states TCI1-TCI4, the SSSGs SSSG1-SSSG2, the movement direction arrow A and the location points P1-P4 can refer to FIG. 7 and are not described here for the sake of brevity. Additionally, in the time dimension T, there are instants TI1-TI3 and a period TP1.

[0087] In FIG. 11 , between location points P1 and P2 (e.g., before instant TI3), the communication device CD performs single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI1). At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. The DCI DCI1 includes a TCI field (or TCI indication) with a TCI codepoint indicating a TCI state TCI2 to TCI3 and includes a duration field indicating a period TP1. At instant TI2, the communication device CD transmits a PUCCH PUCCH1 with HARQ feedback corresponding to the DCI DCI1. At instant TI3, the communication device CD switches to the SSSG SSSG2 in response to the TCI fields indicating at least two of the TCI states TCI1 to TCI4. The period TP1 starts from instant TI2 when the PUCCH PUCCH1 is transmitted and ends at instant TI3. Therefore, at the instant TI3, the communication device CD switches to the SSSG SSSG2 according to the instant TI2 and the period TP1. Between the location points P2 and P3 (e.g., after the instant TI3), the communication device CD performs a multi-TPR operation with the TRPs TRP1 to TRP2 according to the TCI states TCI2 to TCI3 and the SSSG SSSG2 (e.g., monitors the SSSG SSSG2 according to the TCI states TCI2 to TCI3).

[0088] 12 is a schematic diagram of a scenario 120 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. In Fig. 12, the communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A and location points P1-P4 can refer to Fig. 11 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI1-TI6 and periods TP1-TP2.

[0089] In FIG. 12, between location points P1 and P2 (e.g., before instant TI6), the communication device CD performs a single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI1). At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. The DCI DCI1 includes a TCI field (or TCI indication) having a TCI codepoint indicating the TCI state TCI2 to TCI3, and includes a duration field indicating the duration TP1. At instant TI2, the communication device CD transmits a PUCCH PUCCH1 with HARQ feedback corresponding to the DCI DCI1. Thus, the communication device CD schedules to switch to the SSSG SSSG2 at instant TI5 according to instant TI2 and duration TP1.

[0090] Then, the communication device CD receives DCI DCI2 from the TRP TRP1 at an instant TI3, for example in response to a speed change of the communication device CD. The DCI DCI2 includes a TCI field (or TCI indication) having a TCI codepoint indicating a TCI state TCI2-TCI3, and includes a duration field indicating a period TP2. At an instant TI4, the communication device CD transmits a PUCCH PUCCH2 with HARQ feedback corresponding to the DCI DCI2. Thus, the communication device CD switches to the SSSG SSSG2 at an instant TI6 in accordance with the instant TI4 and the period TP2. Between location points P2-P3 (e.g., after instant TI6), the communication device CD performs multi-TPR operation with the TRPs TRP1-TRP2 in accordance with the TCI states TCI2-TCI3 and the SSSG SSSG2 (e.g., monitors the SSSG SSSG2 in accordance with the TCI states TCI2-TCI3).

[0091] In FIG. 12, the instant at which the SSSG switch is performed is changed from instant TI5 to instant TI6, for example in response to a speed change of the communication device CD.

[0092] 13 is a schematic diagram of a scenario 130 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. In Fig. 13, the communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A and location points P1-P4 can refer to Fig. 11 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI1-TI3 and periods TP1-TP2.

[0093] 13, between location points P1 and P2 (e.g., before instant TI3), the communication device CD performs a single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI1). At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. The DCI DCI1 includes a TCI field (or TCI indication) having a TCI code point indicating the TCI state TCI2 to TCI3, and includes a duration field indicating the period TP1. The period TP1 is a period that starts from instant TI1 when the DCI DCI1 is received and ends at instant TI3.

[0094] Additionally, at an instant TI2, the communication device CD receives the DCI DCI2 from the TRP TRP1. The DCI DCI2 includes a TCI field (or TCI indication) having a TCI code point indicating the TCI state TCI2-TCI3, and includes a duration field indicating the period TP2. The period TP2 starts from the instant TI2 at which the DCI DCI2 is received and ends at the instant TI3. ​​The ends of the periods TP1 and TP2 are the same. Therefore, the communication device CD switches to the SSSG SSSG2 at the instant TI3. ​​Between the location points P2-P3 (e.g., after the instant TI3), the communication device CD performs multi-TPR operation with the TRPs TRP1-TRP2 according to the TCI states TCI2-TCI3 and the SSSG SSSG2 (e.g., monitors the SSSG SSSG2 according to the TCI states TCI2-TCI3).

[0095] 13, the communication device CD does not need to transmit a PUCCH with HARQ feedback corresponding to the DCI. Therefore, the network may transmit multiple DCIs to the communication device CD to prevent the communication device CD from not receiving at least one of the DCIs.

[0096] 14 is a schematic diagram of a scenario 140 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. 1-6 and 11. In Fig. 14, the communication device CD, the network (not shown) with two TRPs TRP1-TRP2, the beams B1-B4, the TCI states TCI1-TCI4, the SSSGs SSSG1-SSSG2, the movement direction arrow A and the location points P1-P4 can refer to Fig. 11 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI1-TI5 and periods TP1-TP2.

[0097] 14, between location points P1 and P2 (e.g., before instant TI5), the communication device CD performs a single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI1). The TRP TRP1 transmits the DCI DCI1 to the communication device CD. The DCI DCI1 includes a TCI field (or TCI indication) having a TCI codepoint indicating the TCI state TCI2-TCI3 and a duration field indicating the duration TP1. However, the communication device CD fails to receive the DCI DCI1 at instant TI1 and therefore does not transmit the PUCCH PUCCH1 with the HARQ feedback corresponding to the DCI DCI1 to the TRP TRP1 at instant TI2.

[0098] Then, the TRP TRP1 transmits the DCI DCI2 to the communication device CD. The DCI DCI2 includes a TCI field (or TCI indication) with a TCI codepoint indicating the TCI state TCI2-TCI3 and a duration field indicating the period TP2. The communication device CD successfully receives the DCI DCI2 at the instant TI3 and transmits a PUCCH PUCCH2 with HARQ feedback corresponding to the DCI DCI2 to the TRP TRP1 at the instant TI4. Thus, at the instant TI5, the communication device CD switches to the SSSG SSSG2 according to the time instant TI4 and the period TP2. Between the location points P2-P3 (e.g., after the instant TI5), the communication device CD performs a multi-TPR operation with the TRPs TRP1-TRP2 according to the TCI states TCI2-TCI3 and the SSSG SSSG2 (e.g., monitors the SSSG SSSG2 according to the TCI states TCI2-TCI3).

[0099] 15 is a schematic diagram of a scenario 150 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. In Fig. 15, the communication device CD, the network (not shown) with two TRPs TRP1-TRP2, the beams B1-B4, the TCI states TCI1-TCI4, the SSSGs SSSG1-SSSG2, the movement direction arrow A and the location points P1-P4 can refer to Fig. 11 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI1-TI5 and periods TP1-TP2.

[0100] In FIG. 15, the TRP TRP1 transmits DCIs DCI1 to DCI2 to the communication device CD. The DCI DCI1 includes a TCI field (or TCI indication) with a TCI codepoint indicating the TCI state TCI2 to TCI3 and includes a duration field indicating the period TP1. The DCI DCI2 includes a TCI field (or TCI indication) with a TCI codepoint indicating the TCI state TCI2 to TCI3 and includes a duration field indicating the period TP2. The communication device fails to receive the DCI DCI1 at the time instant TI1 and successfully receives the DCI DCI2 at the time instant TI2. The communication device does not transmit a PUCCH1 with HARQ feedback corresponding to the DCI DCI1 at the time instant TI3 and transmits a PUCCH2 with HARQ feedback corresponding to the DCI DCI2 at the time instant TI4. Thus, at the time instant TI5, the communication device CD switches to the SSSG SSSG2 according to the time instant TI4 and the period TP2. Between location points P2 to P3 (e.g., after instant TI5), the communication device CD performs multi-TPR operations with TRPs TRP1 to TRP2 according to TCI states TCI2 to TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 to TCI3).

[0101] 16 is a schematic diagram of a scenario 160 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. In Figure 16, the communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A and location points P1-P4 can refer to Figure 7 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI1-TI5 and periods TP1-TP3.

[0102] In FIG. 16, between location points P1 and P2 (e.g., before instant TI2), the communication device CD performs single-TRP operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI1). At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. The DCI DCI1 includes a duration field indicating the duration TP1. The duration TP1 starts from instant TI1 when the DCI DCI1 is received and ends at instant TI2. Therefore, at instant TI2, the communication device CD switches to the SSSG SSSG2 and performs multi-TRP operation with the TRPs TRP1 and TRP2 (e.g., monitors the SSSG2 according to the TCI states TCI2 and TCI3).

[0103] Additionally, the communication device CD receives DCI DCI2 from the TRP TRP1 at an instant TI3 and receives DCI DCI3 from the TRP TRP1 at an instant TI4. DCI DCI2 includes a duration field indicating a duration TP2, and DCI DCI3 includes a duration field indicating a duration TP3. The duration TP2 starts from the instant TI3 when DCI DCI2 is received and ends at the instant TI5. The duration TP3 starts from the instant TI4 when DCI DCI2 is received and ends at the instant TI5. Thus, at the instant TI5, the communication device CD switches to the SSSG SSSG1 and performs single-TRP operation with the TRP TRP2 (e.g., monitors the SSSG SSSG1 according to the TCI state TCI4).

[0104] Between location points P2 and P3 (e.g., between moments TI2 and TI5), the communication device CD performs multi-TPR operation with TRPs TRP1 and TRP2, for example, according to TCI states TCI2 and TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 and TCI3). Between location points P3 and P4 (e.g., after moment TI5), the communication device CD performs single-TPR operation with TRPs TRP2, for example, according to TCI states TCI4 and SSSG SSSG1 (e.g., monitors SSSG1 according to TCI state TCI4). In FIG. 16, the DCI includes a field indicating the period of SSSG switching, but does not include a TCI field indicating at least one TCI state and / or an SSSG switching field indicating an SSSG.

[0105] 17 is a schematic diagram of a scenario 170 for handling SSSG and TCI situations according to an example of the present invention, which can be applied to FIGS. In Fig. 17, a communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A, and location points P1-P4 can be seen in Fig. 7 and are not described here for the sake of brevity. Additionally, the time dimension T has instants TI1-TI3, a period TP1, and the movement direction arrow A has a location point P3'. The communication device is configured with a timer.

[0106] 17, between location points P2 and P3' (e.g., before instant TI2), the communication device CD performs multi-TPR operation with TRPs TRP1 and TRP2 according to TCI states TCI2 and TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 and TCI3). At instant TI1, the communication device CD receives DCI DCI1 from TRP TRP1 and / or TRP TRP2 and starts a timer. DCI DCI1 includes a duration field indicating a duration TP1. The duration TP1 starts from instant TI1 when DCI DCI1 is received and ends at instant TI3. ​​At instant TI2, the timer expires, and the communication device CD switches to SSSG SSSG1 in response to the expiration of the timer. Between location points P3' and P3 (e.g., between moments TI2 and TI3), the communication device CD performs a single TPR operation with TRP TRP1 or TRP2 according to one of TCI states TCI2 to TCI3 and the default SSSG (e.g., monitors SSSG1 according to TCI state TCI2. At moment TI3, the communication device CD does not change SSSG SSSG1 and performs a single TPR operation with TRP TRP2 according to TRI state TCI4 and SSSG SSSG1 (e.g., monitors SSSG1 according to TCI state TCI4). Between location points P3 and P4 (e.g., after moment TI3), the communication device CD performs a single TPR operation with TRP TRP2 according to TCI state TCI4 and SSSG SSSG1 (e.g., monitors SSSG1 according to TCI state TCI4).

[0107] In FIG. 17, the moment of performing the SSSG switch may precede moment TI2 from moment TI3 in response to the expiration of the timer.

[0108] 18 is a schematic diagram of a scenario 180 for handling SSSG and TCI conditions according to an example of the present invention. FIG. 18 can be applied to FIGS. In Figure 18, the communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A and location points P1-P4 can refer to Figure 7 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI1-TI4 and periods TP1-TP2.

[0109] In FIG. 18, between location points P1 and P2 (e.g., before instant TI3), the communication device CD may perform single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitor the SSSG1 according to the TCI state TCI1). At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. At instant TI2, the communication device CD transmits a PUCCH PUCCH1 with HARQ feedback corresponding to the DCI DCI1 to the TRP TRP1. The DCI DCI1 includes a TCI field (or TCI indication) with a TCI codepoint indicating the TCI state TCI2 to TCI3, and includes an SSSG switching field indicating the period TP1. The period TP1 starts from instant TI1 when the DCI DCI1 is received and ends at instant TI4. The period TP2 from instant TI2 to instant TI3 is a time for beam application. After a period TP2 from the last symbol of PUCCH PUCCH1, the communication device CD applies one of the TCI states TCI2 to TCI3 indicated by DCI DCI1 (for example, the TCI state TCI2).

[0110] Therefore, between location points P1 and P2 (e.g., between moments TI3 and TI4), the communication device CD may perform a single-TPR operation with the TRP TRP1 according to the TCI state TCI2 and the SSSG SSSG1 (e.g., may monitor the SSSG1 according to the TCI state TCI2). At moment TI4, the communication device CD switches to the SSSG2 according to moment TI1 and period TP1. Between location points P2 and P3 (e.g., after moment TI4), the communication device CD performs a multi-TPR operation with the TRP1 and TRP2 according to the TCI states TCI2 and TCI3 and the SSSG SSSG2 (e.g., monitor the SSSG2 according to the TCI states TCI2 and TCI3).

[0111] 19 is a schematic diagram of a scenario 190 for handling SSSG and TCI conditions according to an example of the present invention. FIG. 19 can be applied to FIGS. 19, the communication device CD, the network (not shown) with two TRPs TRP1-TRP2, the beams B1-B4, the TCI states TCI1-TCI4, the SSSGs SSSG1-SSSG2, the movement direction arrow A and the location points P1-P4 can refer to FIG. 7 and are not described here for the sake of brevity. Additionally, in the time dimension T there are instants TI1-TI6 and periods TP1-TP3.

[0112] In FIG. 19, between location points P1 and P2 (e.g., before instant TI3), the communication device CD may perform single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitor the SSSG1 according to the TCI state TCI1). At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. At instant TI2, the communication device CD transmits a PUCCH PUCCH1 with HARQ feedback corresponding to the DCI DCI1 to the TRP TRP1. The DCI DCI1 includes a TCI field (or TCI indication) with a TCI codepoint indicating the TCI state TCI2 and an SSSG switching field indicating the period TP1. The period TP1 starts from instant TI1 when the DCI DCI1 is received and ends at instant TI6. The period TP2 from instant TI2 to instant TI3 is a time for beam application. After a period TP2 from the last symbol of PUCCH PUCCH1, the communication device CD applies the TCI state TCI2 indicated by the DCI DCI1. Thus, between location points P1 and P2 (e.g., between moments TI3 and TI6), the communication device CD may perform a single TPR operation with the TRP TRP1 according to the TCI state TCI2 and the SSSG SSSG1 (e.g., may monitor the SSSG1 according to the TCI state TCI2).

[0113] At an instant TI4, the communication device CD receives DCI DCI2 from the TRP TRP1. At an instant TI5, the communication device CD transmits PUCCH PUCCH2 with HARQ feedback corresponding to DCI DCI2 to the TRP TRP1. The DCI DCI2 includes a TCI field (or TCI indication) with a TCI codepoint indicating a TCI state TCI2-TCI3 and includes a duration field indicating a period TP3. The period TP3 starts from the instant TI4 at which the DCI DCI2 is received and ends at the instant TI6. At the instant TI6, the communication device CD switches to the SSSG SSSG2 according to the instant TI4 and the period TP3. Between the location points P2-P3 (e.g., after the instant TI6), the communication device CD performs multi-TPR operation with the TRPs TRP1-TRP2 according to the TCI states TCI2-TCI3 and the SSSG SSSG2 (e.g., it may monitor the SSSG SSSG2 according to the TCI states TCI2-TCI3).

[0114] 20 is a schematic diagram of TCI code points in a TCI field in a DCI according to an example of the present invention, which can be applied to FIGS. Table 204 is determined by MAC CE and C i , R., D. i and TCI state (e.g., TCI state ID i, j), where i and j are positive integers. i is the index of the TCI codepoint in the TCI field in the DCI, and j is the index of the TCI state. i,j indicates the j-th TCI state indicated for the i-th TCI codepoint. i indicates that the TCI codepoint in the TCI field corresponds to one TCI state or to multiple TCI states (e.g., TCI state ID i,2 indicates whether a C has a "0" i (e.g., C0 and C1) indicate that the TCI codepoint in the TCI field corresponds to one TCI state (e.g., TCI state ID i,2 indicates that there is no C i(e.g., C2 and C3) indicate that the TCI codepoint represents multiple TCI states (e.g., TCI state ID i,2 Di indicates the default TCI state for monitoring the default SSSG. D with "0" i (e.g., D2) is the TCI state ID i,1 indicates the default TCI state, and Di (e.g., D3) with "1" indicates the TCI state ID i,2 indicates the default TCI state. i If is set to "0", R is i R is a reserved bit and is set to "0".

[0115] In Figure 20, table 202 is determined by the network according to table 204 and contains TCI codepoints for the TCI field in the DCI. Each TCI codepoint corresponds to at least one TCI state (e.g., TCI state ID i,j ) The code point with "0" indicates the TCI state ID. 0,1 , which indicates the C0, R and TCI state IDs in Table 204 0,1 The code point with "1" is the TCI state ID. 1,1 , which indicates the C1, R and TCI state IDs in Table 204 1,1 The code point with "2" is the TCI state ID. 2,1 and TCI status ID 2,2 Indicates the TCI state ID 2,1 is the default TCI state, which is C2, D2, TCI state ID in Table 204 2,1 and TCI status ID 2,2 The code point with "3" is the TCI state ID 3,1 and TCI status ID 3,2 Indicates the TCI state ID 3,2 is the default TCI state, which is C3, D3, TCI state ID in Table 204 3,1 and TCI status ID 3,2 is determined by.

[0116] 21 is a schematic diagram of TCI code points in a TCI field in a DCI according to an example of the present invention, which can be applied to FIGS. Table 212 is determined by the network and contains the TCI codepoints of the TCI field in the DCI. Each TCI codepoint corresponds to at least one TCI state (e.g., TCI state ID i,j ) where i and j are positive integers, i is the index of the TCI codepoint, and j is the index of the TCI state. TCI State ID i,j indicates the j-th TCI state indicated for the i-th TCI codepoint. A codepoint with a '0' indicates the TCI state ID 0,1 A code point with a "1" indicates a TCI state ID. 1,1 The code point with "2" indicates the TCI state ID. 2,1 and TCI status ID 2,2 The code point with "3" indicates the TCI state ID. 3,1 and TCI status ID 3,2 In Table 212, the TCI status ID i,2 If present, the TCI state ID i,2 is determined as the default TCI state. Therefore, the TCI state ID 2,2 and TCI status ID 3,2 is the default TCI state.

[0117] 22 is a schematic diagram of a scenario 220 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. In Figure 22, the communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A, and location points P1-P4 can refer to Figure 7 and are not described here for simplicity. Additionally, the time dimension T has instants TI1-TI3 and periods TP1. The TRP TRP1 is associated with a CORESET pool index CPI1, and the TRP TRP2 is associated with a CORESET pool index CPI2.

[0118] In FIG. 22 , between location points P1 and P2 (e.g., before instant TI3), the communication device CD performs single TPR operation with the TRP TRP1 according to the TCI state TCI1 and the SSSG SSSG1 (e.g., monitors the SSSG1 according to the TCI state TCI1). That is, SSSG monitoring for the SSSG SSSG1 associated with the CORESET pool index CPI1 is enabled, and SSSG monitoring for the SSSG SSSG1 associated with the CORESET pool index CPI2 is disabled. At instant TI1, the communication device CD receives the DCI DCI1 from the TRP TRP1. At instant TI2, the communication device CD transmits to the TRP TRP1 a PUCCH PUCCH1 with HARQ feedback corresponding to the DCI DCI1. The DCI DCI1 includes a TCI field (or TCI indication) with a TCI codepoint indicating the TCI state TCI2-TCI3, and includes an SSSG monitoring field indicating that the SSSG monitoring associated with the CORESET pool index CPI2 is enabled. At the instant TI3, the communication device CD switches to the SSSG SSSG2 in response to the TCI fields indicating at least two of the TCI states TCI1 to TCI4.

[0119] Therefore, between location points P2 and P3 (e.g., after instant TI3), the communication device CD performs multi-TPR operation with TRPs TRP1 to TRP2 according to TCI states TCI2 to TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 to TCI3). Additionally, the period TP1 from instant TI2 to instant TI3 is a time for beam application. From the last symbol of PUCCH PUCCH1 to the period TP1 and / or after enabling SSSG monitoring, the communication device CD applies TCI states TCI2 to TCI3 indicated by DCI DCI1 and / or performs SSSG monitoring associated with CORESET pool indices CPI1 to CPI2.

[0120] 23 is a schematic diagram of a scenario 230 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to FIGS. 1-6 and 21. In Figure 23, the communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A and location points P1-P4, CORESET pool indices CPI1-CPI2 can refer to Figure 22 and are not described here for the sake of brevity. Additionally, in the time dimension T, there are instants TI4-TI6 and a period TP2.

[0121] In FIG. 23 , between location points P2 and P3 (e.g., before moment TI6), the communication device CD performs multi-TPR operation with TRPs TRP1 and TRP2 according to TCI states TCI2 and TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 and TCI3). That is, SSSG monitoring for SSSG SSSG2 associated with CORESET pool indexes CPI1 and CPI2 is enabled. At moment TI4, the communication device CD receives DCI DCI2 from TRP TRP1 and / or TRP TRP2. At moment TI5, the communication device CD transmits PUCCH PUCCH2 with HARQ feedback corresponding to DCI DCI2 to TRP TRP1 and / or TRP TRP2. DCI DCI2 includes a TCI field (or TCI indication) with a TCI codepoint indicating TCI state TCI4 and includes an SSSG monitoring field indicating that SSSG monitoring associated with CORESET pool index CPI1 is disabled. At the instant TI6, the communication device CD switches to the SSSG SSSG1 in response to a TCI field indicating one of the TCI states TCI1 to TCI4.

[0122] Therefore, between location points P3 and P4 (e.g., after instant TI6), the communication device CD performs TRP TRP2 and single TPR operation according to TCI state TCI4 and SSSG SSSG1 (e.g., monitors SSSG1 according to TCI state TCI4). The period TP2 from instant TI5 to instant TI6 is the time for beam application. From the last symbol of PUCCH PUCCH2 to period TP2 and / or after disabling SSSG monitoring, the communication device CD does not perform SSSG monitoring associated with CORESET pool index CPI1.

[0123] Figure 24 is a schematic diagram of a scenario 240 for handling SSSG and TCI conditions according to an example of the present invention, which can be applied to Figures 1 to 6 and Figures 22 to 23. In Figure 24, the communication device CD, a network (not shown) with two TRPs TRP1-TRP2, beams B1-B4, TCI states TCI1-TCI4, SSSGs SSSG1-SSSG2, movement direction arrow A and location points P1-P4, CORESET pool indices CPI1-CPI2 can refer to Figure 22 and are not described here for the sake of brevity. Additionally, in the time dimension T, there are instants TI7-TI9 and a period TP3.

[0124] In FIG. 24 , between location points P2 and P3 (e.g., before moment TI9), the communication device CD performs multi-TPR operation with TRPs TRP1 to TRP2 according to TCI state TCI2 (not shown) and TCI state TCI3 and SSSG SSSG2 (e.g., monitors SSSG2 according to TCI states TCI2 to TCI3). That is, SSSG monitoring for SSSG SSSG2 associated with CORESET pool indices CPI1 to CPI2 is enabled. At moment TI7, the communication device CD receives DCI DCI3 from TRP TRP2. DCI DCI3 includes a TCI field (or TCI indication) with a TCI codepoint indicating TCI state TCI4. DCI DCI3 includes information for TRP TRP2 but not for TRP TRP1. At moment TI8, the communication device CD transmits PUCCH PUCCH3 with HARQ feedback corresponding to DCI DCI3. At the instant TI9, the communication device CD switches to the SSSG SSSG1 in response to a TCI field indicating one of the TCI states TCI1 to TCI4.

[0125] Therefore, between location points P3 and P4 (e.g., after instant TI9), the communication device CD performs TRP TRP2 and single TPR operation according to TCI state TCI4 and SSSG SSSG1 (e.g., monitors SSSG1 according to TCI state TCI4). Additionally, the period TP3 from instant TI8 to instant TI9 is ​​the time for beam application. After the period TP3 from the last symbol of PUCCH PUCCH2, the communication device CD applies TCI state TCI4 to SSSG monitoring associated with CORESET pool index CPI2.

[0126] The operation of "determining" above may be replaced by the operations of "computing," "calculating," "obtaining," "generating," "outputting," "using," "choosing / selecting," "determining," or "configured." The operation of "detecting" above may be replaced by the operations of "monitoring," "receiving," "sensing," or "obtaining." The phrase "according to" above may be replaced by "in response to." The phrase "associated with" above may be replaced by "of" or "corresponding." The term "via" above may be replaced by "on," "in," or "at." The term "when" above may be replaced by "upon," "after," and "in response to." The term "cell" above may be replaced by "serving cell."

[0127] Those skilled in the art should easily make combinations, modifications, and / or changes with respect to the above descriptions and examples. The above description, steps, including suggested steps, and / or processes can be realized by means that can be hardware, software, firmware (also known as a combination of a hardware device and computer instructions and data residing as read-only software on a hardware device), electronic system, or a combination thereof. One example of a means can be a communication device 20.

[0128] Examples of hardware may include analog circuitry, digital circuitry, and / or mixed circuitry. For example, hardware may include an ASIC, a field programmable gate array (FPGA), a programmable logic device, combined hardware components, or a combination thereof. In another example, hardware may include a general-purpose processor, a microprocessor, a controller, a digital signal processor (DSP), or a combination thereof.

[0129] Examples of software may include a set of code, a set of instructions, and / or a set of functions retained (e.g., stored) on a storage unit, e.g., a computer-readable medium. The computer-readable medium may include a SIM, a ROM, a flash memory, a RAM, a CD-ROM / DVD-ROM / BD-ROM, a magnetic tape, a hard disk, an optical data storage device, a non-volatile storage unit, or a combination thereof. The computer-readable medium (e.g., a storage unit) may be internally (e.g., integrated) or externally (e.g., separate) coupled to at least one processor. At least one processor, which may include one or more modules, may execute (e.g., be configured to execute) the software in the computer-readable medium. The set of code, the set of instructions, and / or the set of functions may cause at least one processor, module, hardware, and / or electronic system to perform related steps.

[0130] Examples of electronic systems may include a system on a chip, a system in a package, a computer on a module, a computer program product, an appliance, a mobile phone, a laptop, a tablet computer, an e-book, or a portable computer system, and a communication device 20.

[0131] In summary, the embodiments of the present invention provide a communication device and method for handling SSSG and TCI states. The communication device receives a DCI from a network, where the DCI includes at least one field indicating a TCI state, an SSSG, and / or a duration. The DCI is used to handle the SSSG switching / monitoring and the TCI state, and realizes dynamic switching between single TRP and multi-TRP. Therefore, the problem of how to handle the SSSG and TCI states can be solved.

[0132] Those skilled in the art will readily appreciate that numerous modifications and variations of the devices and methods may be made while retaining the teachings of the present invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims.

Claims

1. 1. A communications device for indicating and applying a transmission configuration indicator (TCI) state, comprising: at least one storage device; at least one processing circuit coupled to the at least one storage device, wherein the at least one storage device stores instructions, and the at least one processing circuit: configured to execute instructions to receive downlink (DL) control information (DCI) from a network via a control resource set (CORESET); The communications device, wherein the DCI includes a TCI field, the TCI field indicating a TCI codepoint corresponding to at least one of a first TCI state or a second TCI state.

2. The communications device of claim 1 , wherein the first TCI state is a DL TCI state or an uplink (UL) TCI state, and the second TCI state is the DL TCI state or the UL TCI state.

3. 2. The communications device of claim 1, wherein the CORESET is configured to have at least one TCI state indicated by the DCI, the at least one TCI state including at least one of the first TCI state or the second TCI state.

4. The instruction: The communications device of claim 3 , further comprising receiving at least one Physical DL Control Channel (PDCCH) from the network according to the at least one TCI state via the CORESET.

5. 5. The communications device of claim 4, wherein a demodulation reference signal (DM-RS) antenna port for receiving the at least one PDCCH via the CORESET is quasi-co-located with a plurality of RSs provided by the at least one TCI state.

6. 10. The communications device of claim 1, wherein the CORESET is associated with at least one of a plurality of user equipment (UE) specific search space (USS) sets or a plurality of PDCCH common search space (CSS) sets.

7. 2. The communications device of claim 1, wherein the CORESET is configured to have a value of a CORESET Pool Index, the value of the CORESET Pool Index being associated with at least one of a first TCI state or a second TCI state.

8. 2. The communications device of claim 1, wherein the TCI field indicates at least one of the first TCI state or the second TCI state in a component carrier (CC) set or a bandwidth portion (BWP) set in a CC list.

9. The instruction: The communication device of claim 1 , further comprising receiving, from the network, an activation command for mapping a plurality of TCI states to at least one TCI code point of the TCI field.

10. The instruction: transmitting a physical UL control channel (PUCCH) to the network according to a spatial setting associated with at least one TCI state; 2. The communications device of claim 1, wherein the at least one TCI state includes at least one of the first TCI state or the second TCI state.

11. The communications device of claim 1 , wherein the TCI codepoint is associated with a value of a CORESET pool index.

12. 2. The communications device of claim 1, wherein if the TCI codepoint corresponds to the first TCI state and the second TCI state, the first TCI state and the second TCI state are associated with the same value of a CORESET pool index.

13. The instruction: transmitting, to the network, a PUCCH corresponding to the DCI including a TCI status indication; The communications device of claim 1 , wherein the last symbol of the PUCCH includes hybrid automatic repeat request (HARQ) feedback.

14. The instruction:

14. The communications device of claim 13, further comprising: if the at least one of the first TCI state or the second TCI state is different from a previous TCI state indicated by a previous TCI state indication, starting application of the at least one of the first TCI state or the second TCI state indicated by the TCI field from at least a slot that is a time relative to a beam application symbol after the last symbol of the PUCCH.

15. A network for indicating and applying a transmission configuration indicator (TCI) state, comprising: at least one storage device; at least one processing circuit coupled to the at least one storage device, wherein the at least one storage device stores instructions, and the at least one processing circuit: instructions to generate downlink (DL) control information (DCI); and transmitting the DCI to a communication device via a control resource set (CORESET); The communications device, wherein the DCI includes a TCI field, the TCI field indicating a TCI codepoint corresponding to at least one of a first TCI state or a second TCI state.

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