WO2023131809A1

WO2023131809A1 - Apparatus and method of wireless communication

Info

Publication number: WO2023131809A1
Application number: PCT/IB2022/000016
Authority: WO
Inventors: Hao Lin
Original assignee: Orope France Sarl
Priority date: 2022-01-10
Filing date: 2022-01-10
Publication date: 2023-07-13

Abstract

An apparatus and a method of wireless communication are provided. The method by a user equipment (UE) includes being configured by a base station, with a first search space set group (SSSG) and a second SSSG and monitoring a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station. The first information includes a beam direction relevant information, and the beam direction relevant information includes one or more beams and/or one or more beam indexes, where the one or more beam indexes correspond to a reference signal with index.

Description

APPARATUS AND METHOD OF WIRELESS COMMUNICATION

BACKGROUND OF DISCLOSURE

1. Field of the Disclosure

[0001] The present disclosure relates to the field of communication systems, and more particularly, to an apparatus and a method of wireless communication, which can provide a good communication performance and/or high reliability.

2. Description of the Related Art

[0002] Wireless communications systems are widely deployed to provide various types of communication content such as voice, video, packet data, messaging, broadcast, and so on. These systems may be capable of supporting communication with multiple users by sharing the available system resources (e.g., time, frequency, and power). Examples of such multiple- access systems include fourth generation (4G) systems such as long term evolution (LTE) systems, LTE-advanced (LTE-A) systems, or LTE-A pro systems, and fifth generation (5G) systems which may be referred to as new radio (NR) systems. These systems may employ technologies such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple-access communications system may include a number of base stations or network access nodes, each simultaneously supporting communication for multiple communication devices, which may be otherwise known as user equipment (UE).

[0003] In release 16 NR system, a UE can be configured to switch from one search space set group (SSSG) to another SSSG to reduce a UE power consumption for physical downlink control channel (PDCCH) monitoring. In high frequency, e.g., frequency range 2-2 (FR2-2), a configuration related to a switching from one SSSG to another SSSG for the UE needs to be improved, so that the UE can explore such improved configuration for further UE power saving.

SUMMARY

[0004] An object of the present disclosure is to propose an apparatus (such as a user equipment (UE) and/or a base station) and a method of wireless communication, which can provide a UE power saving, provide a good communication performance, and/or provide high reliability.

[0005] In a first aspect of the present disclosure, a method of wireless communication by a user equipment (UE) comprises being configured by a base station, with a first search space set group (SSSG) and a second SSSG and monitoring a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station.

[0006] In some embodiments of the above method according to the first aspect of the present disclosure, the UE performs switching between the first SSSG and the second SSSG according to the first information.

[0007] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the first information comprises a beam direction relevant information, and the beam direction relevant information comprises one or more beams and/or one or more beam indexes, where the one or more beam indexes correspond to a reference signal with index.

[0008] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the reference signal with index comprises a synchronization signal block (SSB) index, a channel state information reference signal (CSI-RS) resource index, or a sounding reference signal (SRS) resource index.

[0009] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the first information is indicated in an indication field of a downlink control information (DCI) 2_0 from the base station or the first information is obtained through the DCI 2_0.

[0010] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the indication field comprises a beam direction relevant information field.

[0011] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the second SSSG comprises one or more SS sets, each of the one or more SS sets is associated with a control resource set (CORESET).

[0012] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the CORESET is associated with a transmission configuration indicator (TCI) state.

[0013] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state matched with the one or more beams indicated by the DCI 2_0.

[0014] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state not matched with the one or more beams indicated by the DCI 2_0. [0015] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the TCI state matched with the one or more beams indicated by the DCI 2_0 comprises that a spatial domain transmission filter associated with the TCI state for the CORESET is same as a spatial domain filter associated with the beam indicated by the beam direction relevant information.

[0016] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the spatial domain filter associated with the beam indicated by the beam direction relevant information comprises that the beam direction relevant information indicates one or more reference signal indexes; and the spatial domain filter is used to receive the one or more indicated reference signals corresponding to the one or more reference signal indexes.

[0017] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the beam direction relevant information is not explicitly provided in the DCI 2_0, the UE determines the beam direction relevant information from the TCI state of the CORESET associated with a first SS set for monitoring DCI 2_0 or a COREST associated with a second SS set in which the UE monitors the PDCCH.

[0018] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the first SS set and/or the second SS set is belonging to the first SSSG.

[0019] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the UE is configured by the base station, with a configuration between a beamlevel SSSG switch function with the beam direction relevant information and a SSSG switch function without the beam direction relevant information.

[0020] In some embodiments of any one of the above methods according to the first aspect of the present disclosure, the configuration is provided in system information or a UE-dedicated radio resource control (RRC) signaling.

[0021] In a second aspect of the present disclosure, a method of wireless communication by a base station comprises configuring to a user equipment (UE), a first search space set group (SSSG) and a second SSSG and controlling the UE to monitor a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station.

[0022] In some embodiments of the above method according to the second aspect of the present disclosure, the base station controls the UE to perform switching between the first SSSG and the second SSSG according to the first information.

[0023] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the first information comprises a beam direction relevant information, and the beam direction relevant information comprises one or more beams and/or one or more beam indexes, where the one or more beam indexes correspond to a reference signal with index.

[0024] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the reference signal with index comprises a synchronization signal block (SSB) index, a channel state information reference signal (CSI-RS) resource index, or a sounding reference signal (SRS) resource index.

[0025] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the first information is indicated in an indication field of a downlink control information (DCI) 2_0 from the base station or the first information is obtained through the DCI 2_0.

[0026] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the indication field comprises a beam direction relevant information field. [0027] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the second SSSG comprises one or more SS sets, each of the one or more SS sets is associated with a control resource set (CORESET).

[0028] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the CORESET is associated with a transmission configuration indicator (TCI) state.

[0029] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, when the base station controls the UE to switch from the first SSSG to the second SSSG, the base station controls the UE to monitor the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state matched with the one or more beams indicated by the DCI 2_0.

[0030] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, when the base station controls the UE to switch from the first SSSG to the second SSSG, the base station controls the UE to monitor the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state not matched with the one or more beams indicated by the DCI 2_0.

[0031] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the TCI state matched with the one or more beams indicated by the DCI 2_0 comprises that a spatial domain transmission filter associated with the TCI state for the CORESET is same as a spatial domain filter associated with the beam indicated by the beam direction relevant information. [0032] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the spatial domain filter associated with the beam indicated by the beam direction relevant information comprises that one or more reference signal indexes; and the spatial domain filter is used to receive the one or more indicated reference signals corresponding to the one or more reference signal indexes.

[0033] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the beam direction relevant information is not explicitly provided in the DO 2_0, the base station controls the UE to determine the beam direction relevant information from the TCI state of the CORESET associated with a first SS set for monitoring DO 2_0 or a COREST associated with a second SS set in which the UE monitors the PDCCH.

[0034] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the first SS set and/or the second SS set is belonging to the first SSSG.

[0035] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the base station configures to the UE, a configuration between a beam-level SSSG switch function with the beam direction relevant information and a SSSG switch function without the beam direction relevant information.

[0036] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, the configuration is provided in system information or a UE-dedicated radio resource control (RRC) signaling.

[0037] In some embodiments of any one of the above methods according to the second aspect of the present disclosure, when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH in part of the SS sets of the second SSSG, where the UE determines the part of the SS sets according to the first information.

[0038] In a third aspect of the present disclosure, a user equipment comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to perform the above method.

[0039] In a fourth aspect of the present disclosure, a base station comprises a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to perform the above method.

[0040] In a fifth aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method. [0041] In a sixth aspect of the present disclosure, a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method.

[0042] In a seventh aspect of the present disclosure, a computer readable storage medium, in which a computer program is stored, causes a computer to execute the above method.

[0043] In an eighth aspect of the present disclosure, a computer program product includes a computer program, and the computer program causes a computer to execute the above method.

[0044] In a ninth aspect of the present disclosure, a computer program causes a computer to execute the above method.

BRIEF DESCRIPTION OF DRAWINGS

[0045] In order to illustrate the embodiments of the present disclosure or related art more clearly, the following figures will be described in the embodiments are briefly introduced. It is obvious that the drawings are merely some embodiments of the present disclosure, a person having ordinary skill in this field can obtain other figures according to these figures without paying the premise.

[0046] FIG. 1 is a block diagram of one or more user equipments (UEs) and a base station (e.g., gNB or eNB) of communication in a communication network system (e.g., non-terrestrial network (NTN) or a terrestrial network) according to an embodiment of the present disclosure.

[0047] FIG. 2 is a flowchart illustrating a method of wireless communication performed by a user equipment (UE) according to an embodiment of the present disclosure.

[0048] FIG. 3 is a flowchart illustrating a method of wireless communication performed by a base station according to an embodiment of the present disclosure.

[0049] FIG. 4 is a block diagram of a system for wireless communication according to an embodiment of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENTS

[0050] Embodiments of the present disclosure are described in detail with the technical matters, structural features, achieved objects, and effects with reference to the accompanying drawings as follows. Specifically, the terminologies in the embodiments of the present disclosure are merely for describing the purpose of the certain embodiment, but not to limit the disclosure.

[0051] In release 16 new radio (NR) system, a user equipment (UE) can be configured to monitor a downlink control information (DCI) 2_0, which is a group common DCI format as illustrated in TS 38.213 and TS 38.212. The DCI 2_0 may be configured to contain the following information: 1) SFI indication, 2) COT remaining duration, 3) RB set availability, and/or 4) search space set group (SSSG) switching. One of useful features for SFI is that the SFI indication is used to cancel pre-configured transmissions. The COT remaining duration indication and the RB set availability indication tell UE whether a gNB has access a channel and a remaining duration for the gNB to further occupy the channel. Further, an SSSG switching flag informs the UE to switch from one SSSG to another SSSG.

[0052] In high frequency band, e.g., FR2-2, beam forming is a necessary technique for attending a reliable communication. Thus, beam level indication becomes an important information for the UE to better understand beam directions together with information provided by the DCI 2_0. In this disclosure, some embodiments present a method for a gNB providing such beam level information to a UE. Moreover, some embodiments present a method for the UE to determine DCI 2_0 included information with better precision.

[0053] Further, in release 16 NR system, a UE can be configured to switch from one search space set group (SSSG) to another SSSG to reduce a UE power consumption for PDCCH monitoring. In high frequency band, e.g., FR2-2, beam forming is a necessary technique for attending a reliable communication. Moreover, a network such as a base station may perform a directional channel access or a directional listen before talk (LBT). When the directional LBT is successful, it the network is engaged to initiate a COT corresponding to a given beam direction. This beam direction is an additional dimension for the UE to explore for UE power consumption reduction. In this disclosure, some embodiments present a method for the UE to explore such beam level information for further UE power saving.

[0054] FIG. 1 illustrates that, in some embodiments, one or more user equipments (UEs) 10 and a base station (e.g., gNB or eNB) 20 for transmission adjustment in a communication network system 30 (e.g., non-terrestrial network (NTN) or terrestrial network) according to an embodiment of the present disclosure are provided. The communication network system 30 includes the one or more UEs 10 and the base station 20. The one or more UEs 10 may include a memory 12, a transceiver 13, and a processor 11 coupled to the memory 12 and the transceiver 13. The base station 20 may include a memory 22, a transceiver 23, and a processor 21 coupled to the memory 22 and the transceiver 23. The processor 11 or 21 may be configured to implement proposed functions, procedures and/or methods described in this description. Layers of radio interface protocol may be implemented in the processor 11 or 21. The memory 12 or 22 is operatively coupled with the processor 11 or 21 and stores a variety of information to operate the processor 11 or 21. The transceiver 13 or 23 is operatively coupled with the processor 11 or 21, and the transceiver 13 or 23 transmits and/or receives a radio signal.

[0055] The processor 11 or 21 may include application- specific integrated circuit (ASIC), other chipset, logic circuit and/or data processing device. The memory 12 or 22 may include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and/or other storage device. The transceiver 13 or 23 may include baseband circuitry to process radio frequency signals. When the embodiments are implemented in software, the techniques described herein can be implemented with modules (e.g., procedures, functions, and so on) that perform the functions described herein. The modules can be stored in the memory 12 or 22 and executed by the processor 11 or 21. The memory 12 or 22 can be implemented within the processor 11 or 21 or external to the processor 11 or 21 in which case those can be communicatively coupled to the processor 11 or 21 via various means as is known in the art.

[0056] In some embodiments, the processor 11 is configured by the base station 20, with a first search space set group (SSSG) and a second SSSG, and the processor 11 is configured to monitor a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station 20. This can provide a UE power saving, provide a good communication performance, and/or provide high reliability.

[0057] In some embodiments, the processor 21 configures to the user equipment (UE) 10, a first search space set group (SSSG) and a second SSSG, and the processor 21 controls the UE 10 to monitor a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station 20. This can provide a UE power saving, provide a good communication performance, and/or provide high reliability.

[0058] FIG. 2 illustrates a method 200 of wireless communication by a user equipment (UE) according to an embodiment of the present disclosure. In some embodiments, the method 200 includes: a block 202, being configured by a base station, with a first search space set group (SSSG) and a second SSSG, and a block 204, monitoring a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station. This can provide a UE power saving, provide a good communication performance, and/or provide high reliability.

[0059] In some embodiments, the UE performs switching between the first SSSG and the second SSSG according to the first information. In some embodiments, the first information comprises a beam direction relevant information, and the beam direction relevant information comprises one or more beams and/or one or more beam indexes, where the one or more beam indexes correspond to a reference signal with index. In some embodiments, the reference signal with index comprises a synchronization signal block (SSB) index, a channel state information reference signal (CSI-RS) resource index, or a sounding reference signal (SRS) resource index. In some embodiments, the first information is indicated in an indication field of a downlink control information (DCI) 2_0 from the base station or the first information is obtained through the DCI 2_0. In some embodiments, the indication field comprises a beam direction relevant information field. In some embodiments, the second SSSG comprises one or more SS sets, each of the one or more SS sets is associated with a control resource set (CORESET).

[0060] In some embodiments, the CORESET is associated with a transmission configuration indicator (TCI) state. In some embodiments, when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state matched with the one or more beams indicated by the DCI 2_0. In some embodiments, when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state not matched with the one or more beams indicated by the DCI 2_0. In some embodiments, the TCI state matched with the one or more beams indicated by the DCI 2_0 comprises that a spatial domain transmission filter associated with the TCI state for the CORESET is same as a spatial domain filter associated with the beam indicated by the beam direction relevant information. In some embodiments, the spatial domain filter associated with the beam indicated by the beam direction relevant information comprises that one or more reference signal indexes; and the spatial domain filter is used to receive the one or more indicated reference signals corresponding to the one or more reference signal indexes.

[0061] In some embodiments, the beam direction relevant information is not explicitly provided in the DCI 2_0, the UE determines the beam direction relevant information from the TCI state of the CORESET associated with a first SS set for monitoring DCI 2_0 or a COREST associated with a second SS set in which the UE monitors the PDCCH. In some embodiments, the first SS set and/or the second SS set is belonging to the first SSSG. In some embodiments, the UE is configured by the base station, with a configuration between a beam-level SSSG switch function with the beam direction relevant information and a SSSG switch function without the beam direction relevant information. In some embodiments, the configuration is provided in system information or a UE-dedicated radio resource control (RRC) signaling. In some embodiments, when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH in part of the SS sets of the second SSSG, where the UE determines the part of the SS sets according to the first information.

[0062] FIG. 3 illustrates a method 300 of wireless communication by a base station according to an embodiment of the present disclosure. In some embodiments, the method 300 includes: a block 302, configuring to a user equipment (UE), a first search space set group (SSSG) and a second SSSG, and a block 304, controlling the UE to monitor a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station. This can provide a UE power saving, provide a good communication performance, and/or provide high reliability.

[0063] In some embodiments, the base station controls the UE to perform switching between the first SSSG and the second SSSG according to the first information. In some embodiments, the first information comprises a beam direction relevant information, and the beam direction relevant information comprises one or more beams and/or one or more beam indexes, where the one or more beam indexes correspond to a reference signal with index. In some embodiments, the reference signal with index comprises a synchronization signal block (SSB) index, a channel state information reference signal (CSI-RS) resource index, or a sounding reference signal (SRS) resource index. In some embodiments, the first information is indicated in an indication field of a downlink control information (DCI) 2_0 from the base station or the first information is obtained through the DCI 2_0. In some embodiments, the indication field comprises a beam direction relevant information field.

[0064] In some embodiments, the second SSSG comprises one or more SS sets, each of the one or more SS sets is associated with a control resource set (CORESET). In some embodiments, the CORESET is associated with a transmission configuration indicator (TCI) state. In some embodiments, when the base station controls the UE to switch from the first SSSG to the second SSSG, the base station controls the UE to monitor the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state matched with the one or more beams indicated by the DCI 2_0. In some embodiments, when the base station controls the UE to switch from the first SSSG to the second SSSG, the base station controls the UE to monitor the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state not matched with the one or more beams indicated by the DCI 2_0.

[0065] In some embodiments, the TCI state matched with the one or more beams indicated by the DCI 2_0 comprises that a spatial domain transmission filter associated with the TCI state for the CORESET is same as a spatial domain filter associated with the beam indicated by the beam direction relevant information. In some embodiments, the spatial domain filter associated with the beam indicated by the beam direction relevant information comprises that one or more reference signal indexes; and the spatial domain filter is used to receive the one or more indicated reference signals corresponding to the one or more reference signal indexes. In some embodiments, the beam direction relevant information is not explicitly provided in the DCI 2_0, the base station controls the UE to determine the beam direction relevant information from the TCI state of the CORESET associated with a first SS set for monitoring DCI 2_0 or a COREST associated with a second SS set in which the UE monitors the PDCCH. In some embodiments, the first SS set and/or the second SS set is belonging to the first SSSG. In some embodiments, the base station configures to the UE, a configuration between a beam-level SSSG switch function with the beam direction relevant information and a SSSG switch function without the beam direction relevant information. In some embodiments, the configuration is provided in system information or a UE-dedicated radio resource control (RRC) signaling. In some embodiments, when the base station controls the UE to switch from the first SSSG to the second SSSG, the base station controls the UE to monitor the PDCCH in part of the SS sets of the second SSSG, where the base station controls the UE to determine the part of the SS sets according to the first information.

[0066] The examples given in this disclosure can be applied for loT device or NB-IoT UE in NTN systems, but the method is not exclusively restricted to NTN system nor for loT devices or NB-IoT UE. The examples given in this disclosure can be applied for NR systems, LTE systems, or NB-IoT systems. Further, some examples in the present disclosure can be applied for NB-IoT system, the PDCCH is equivalent to NB -PDCCH (NPDCCH) and the PDSCH is equivalent to NB-PDSCH (NPDSCH).

[0067] Example:

[0068] In some examples, a basic concept is that a gNB may configure a first SSSG (GO) and a second SSSG (Gl) for a UE, and the UE starts from the first SSSG to monitor a PDCCH according to SS sets in the first SSSG. When UE receives an indication from the gNB to switch from the first SSSG to the second SSSG according to a given beam direction, the UE starts to monitor in the second SSSG and stops to monitor in the first SSSG. When the UE monitors a PDCCH according to the second SSSG, the UE may only monitor the PDCCH in a CORESET associated with the given beam direction. The given beam may be indicated in a DCI 2_0 by an indication field e.g., beam level indication field. The indication field may indicate one or more beams, where the indicated beam may be associated with a reference signal index, e.g., SSB index, a CSI-RS resource index, or an SRS resource index. The second SSSG is configured to contain one or more search space sets (SS sets), each SS set may be associated with a CORESET. The CORESET is further associated with a TCI state. When the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH according to the second SSSG but only in the SS set associated with CORESET with the TCI state matched with the one or more beams indicated by the DCI 2_0. In this example, the gNB informs the UE about the indicated beam in order to let the UE only monitor PDCCH according to the indicated beam. In some examples, on the contrary, the UE may monitor the PDCCH according to the second SSSG but only in the SS set associated with CORESET with the TCI state not matched with the one or more beams indicated by the DCI 2_0. In this example the gNB informs the UE about the indicated beam in order to let UE not to monitor PDCCH according to the indicated beams.

[0069] In some examples, a gNB configures a UE to monitor the DCI 2_0, and the DO 2_0 contains a beam level indication field. In some examples, the beam level indication field indicates one or more beam indexes, where each beam index corresponds to one or more reference signal with index, e.g., one or more SSB index or one or more CSI-RS resource index. In some examples, the beam level indication field in the DCI 2_0 provides a value to the UE and the value corresponds to one or more reference signal index. The mapping between the value and the one or more reference signal index may be pre-configured by the network via system information or UE dedicated RRC signaling.

[0070] In some examples, the TCI state matched with the beam indicated by the beam level indication means that the spatial domain transmission filter associated with the indicated TCI state for CORESET is same as the spatial domain filter associated with the beam indicated by the level indication. In some examples, the spatial domain filter associated with the beam indicated by the beam level indication means that the beam level indication may indicates a reference signal index, and the spatial domain filter is used to receive the indicated reference signal.

[0071] In some examples, the beam level indication is not explicitly provided in the DCI 2_0, the UE may determine the beam level indication from the TCI state of the CORESET associated with the search space set for monitoring DCI 2_0 or a COREST associated with a search space set in which the UE monitors a PDCCH. In some examples, the search space set is belonging to the first SSSG.

[0072] In some examples, the network may configure between the beam-level SSSG switch function and the legacy SSSG switch function. The configuration may be provided in a system information or a UE-dedicated RRC signaling.

[0073] Commercial interests for some embodiments are as follows. 1. Providing a method for the UE to determine a downlink control information (DCI) 2_0 included information with better precision. 2. Improving power consumption. 3. Providing a good communication performance. 4. Providing a high reliability. 5. Some embodiments of the present disclosure are used by 5G-NR chipset vendors, V2X communication system development vendors, automakers including cars, trains, trucks, buses, bicycles, moto-bikes, helmets, and etc., drones (unmanned aerial vehicles), smartphone makers, communication devices for public safety use, AR/VR device maker for example gaming, conference/seminar, education purposes. Some embodiments of the present disclosure are a combination of “techniques/processes” that can be adopted in 3GPP specification to create an end product. Some embodiments of the present disclosure could be adopted in 5G NR licensed and non-licensed or shared spectrum communications. Some embodiments of the present disclosure propose technical mechanisms.

[0074] FIG. 4 is a block diagram of an example system 700 for wireless communication according to an embodiment of the present disclosure. Embodiments described herein may be implemented into the system using any suitably configured hardware and/or software. FIG. 4 illustrates the system 700 including a radio frequency (RF) circuitry 710, a baseband circuitry 720, an application circuitry 730, a memory/storage 740, a display 750, a camera 760, a sensor 770, and an input/output (VO) interface 780, coupled with each other at least as illustrated. The application circuitry 730 may include a circuitry such as, but not limited to, one or more singlecore or multi-core processors. The processors may include any combination of general-purpose processors and dedicated processors, such as graphics processors, application processors. The processors may be coupled with the memory/storage and configured to execute instructions stored in the memory/storage to enable various applications and/or operating systems running on the system.

[0075] The baseband circuitry 720 may include circuitry such as, but not limited to, one or more single-core or multi-core processors. The processors may include a baseband processor. The baseband circuitry may handle various radio control functions that enables communication with one or more radio networks via the RF circuitry. The radio control functions may include, but are not limited to, signal modulation, encoding, decoding, radio frequency shifting, etc. In some embodiments, the baseband circuitry may provide for communication compatible with one or more radio technologies. For example, in some embodiments, the baseband circuitry may support communication with an evolved universal terrestrial radio access network (EUTRAN) and/or other wireless metropolitan area networks (WMAN), a wireless local area network (WEAN), a wireless personal area network (WPAN). Embodiments in which the baseband circuitry is configured to support radio communications of more than one wireless protocol may be referred to as multimode baseband circuitry.

[0076] In various embodiments, the baseband circuitry 720 may include circuitry to operate with signals that are not strictly considered as being in a baseband frequency. For example, in some embodiments, baseband circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency. The RF circuitry 710 may enable communication with wireless networks using modulated electromagnetic radiation through a non-solid medium. In various embodiments, the RF circuitry may include switches, filters, amplifiers, etc. to facilitate the communication with the wireless network. In various embodiments, the RF circuitry 710 may include circuitry to operate with signals that are not strictly considered as being in a radio frequency. For example, in some embodiments, RF circuitry may include circuitry to operate with signals having an intermediate frequency, which is between a baseband frequency and a radio frequency.

[0077] In various embodiments, the transmitter circuitry, control circuitry, or receiver circuitry discussed above with respect to the user equipment, eNB, or gNB may be embodied in whole or in part in one or more of the RF circuitry, the baseband circuitry, and/or the application circuitry. As used herein, “circuitry” may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), an electronic circuit, a processor (shared, dedicated, or group), and/or a memory (shared, dedicated, or group) that execute one or more software or firmware programs, a combinational logic circuit, and/or other suitable hardware components that provide the described functionality. In some embodiments, the electronic device circuitry may be implemented in, or functions associated with the circuitry may be implemented by, one or more software or firmware modules. In some embodiments, some or all of the constituent components of the baseband circuitry, the application circuitry, and/or the memory/storage may be implemented together on a system on a chip (SOC). The memory/storage 740 may be used to load and store data and/or instructions, for example, for system. The memory/storage for one embodiment may include any combination of suitable volatile memory, such as dynamic random access memory (DRAM)), and/or non-volatile memory, such as flash memory.

[0078] In various embodiments, the RO interface 780 may include one or more user interfaces designed to enable user interaction with the system and/or peripheral component interfaces designed to enable peripheral component interaction with the system. User interfaces may include, but are not limited to a physical keyboard or keypad, a touchpad, a speaker, a microphone, etc. Peripheral component interfaces may include, but are not limited to, a non-volatile memory port, a universal serial bus (USB) port, an audio jack, and a power supply interface. In various embodiments, the sensor 770 may include one or more sensing devices to determine environmental conditions and/or location information related to the system. In some embodiments, the sensors may include, but are not limited to, a gyro sensor, an accelerometer, a proximity sensor, an ambient light sensor, and a positioning unit. The positioning unit may also be part of, or interact with, the baseband circuitry and/or RF circuitry to communicate with components of a positioning network, e.g., a global positioning system (GPS) satellite.

[0079] In various embodiments, the display 750 may include a display, such as a liquid crystal display and a touch screen display. In various embodiments, the system 700 may be a mobile computing device such as, but not limited to, a laptop computing device, a tablet computing device, a netbook, an ultrabook, a smartphone, an AR/VR glasses, etc. In various embodiments, system may have more or less components, and/or different architectures. Where appropriate, methods described herein may be implemented as a computer program. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

[0080] A person having ordinary skill in the art understands that each of the units, algorithm, and steps described and disclosed in the embodiments of the present disclosure are realized using electronic hardware or combinations of software for computers and electronic hardware. Whether the functions run in hardware or software depends on the condition of application and design requirement for a technical plan. A person having ordinary skill in the art can use different ways to realize the function for each specific application while such realizations should not go beyond the scope of the present disclosure. It is understood by a person having ordinary skill in the art that he/she can refer to the working processes of the system, device, and unit in the above-mentioned embodiment since the working processes of the above-mentioned system, device, and unit are basically the same. For easy description and simplicity, these working processes will not be detailed.

[0081] It is understood that the disclosed system, device, and method in the embodiments of the present disclosure can be realized with other ways. The above-mentioned embodiments are exemplary only. The division of the units is merely based on logical functions while other divisions exist in realization. It is possible that a plurality of units or components are combined or integrated in another system. It is also possible that some characteristics are omitted or skipped. On the other hand, the displayed or discussed mutual coupling, direct coupling, or communicative coupling operate through some ports, devices, or units whether indirectly or communicatively by ways of electrical, mechanical, or other kinds of forms.

[0082] The units as separating components for explanation are or are not physically separated. The units for display are or are not physical units, that is, located in one place or distributed on a plurality of network units. Some or all of the units are used according to the purposes of the embodiments. Moreover, each of the functional units in each of the embodiments can be integrated in one processing unit, physically independent, or integrated in one processing unit with two or more than two units.

[0083] If the software function unit is realized and used and sold as a product, it can be stored in a readable storage medium in a computer. Based on this understanding, the technical plan proposed by the present disclosure can be essentially or partially realized as the form of a software product. Or, one part of the technical plan beneficial to the conventional technology can be realized as the form of a software product. The software product in the computer is stored in a storage medium, including a plurality of commands for a computational device (such as a personal computer, a server, or a network device) to run all or some of the steps disclosed by the embodiments of the present disclosure. The storage medium includes a USB disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a floppy disk, or other kinds of media capable of storing program codes. [0084] While the present disclosure has been described in connection with what is considered the most practical and preferred embodiments, it is understood that the present disclosure is not limited to the disclosed embodiments but is intended to cover various arrangements made without departing from the scope of the broadest interpretation of the appended claims.

Claims

What is claimed is:

1. A wireless communication method by a user equipment (UE), comprising: being configured by a base station, with a first search space set group (SSSG) and a second SSSG; and monitoring a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station.

2. The method of claim 1, wherein the UE performs switching between the first SSSG and the second SSSG according to the first information.

3. The method of claim 1 or 2, wherein the first information comprises a beam direction relevant information, and the beam direction relevant information comprises one or more beams and/or one or more beam indexes, where the one or more beam indexes correspond to a reference signal with index.

4. The method of claim 3, wherein the reference signal with index comprises a synchronization signal block (SSB) index, a channel state information reference signal (CSI-RS) resource index, or a sounding reference signal (SRS) resource index.

5. The method of any one of claims 1 to 4, wherein the first information is indicated in an indication field of a downlink control information (DCI) 2_0 from the base station or the first information is obtained through the DCI 2_0.

6. The method of claim 5, wherein the indication field comprises a beam direction relevant information field.

7. The method of any one of claims 1 to 6, wherein the second SSSG comprises one or more SS sets, each of the one or more SS sets is associated with a control resource set (CORESET).

8. The method of claim 7, wherein the CORESET is associated with a transmission configuration indicator (TCI) state.

9. The method of claim 8, wherein when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state matched with the one or more beams indicated by the DCI 2_0.

10. The method of claim 8, wherein when the UE switches from the first SSSG to the second SSSG, the UE monitors the PDCCH according to the second SSSG in the SS set associated with the CORESET with the TCI state not matched with the one or more beams indicated by the DCI 2_0.

11. The method of claim 9, wherein the TCI state matched with the one or more beams indicated by the DCI 2_0 comprises that a spatial domain transmission filter associated with the TCI state for the CORESET is same as a spatial domain filter associated with the beam indicated by the beam direction relevant information.

12. The method of claim 10, wherein the spatial domain filter associated with the beam indicated by the beam direction relevant information comprises that one or more reference signal indexes; and the spatial domain filter is used to receive the one or more indicated reference signals corresponding to the one or more reference signal indexes.

13. The method of any one of claims 8 to 12, wherein the beam direction relevant information is not explicitly provided in the DO 2_0, the UE determines the beam direction relevant information from the TCI state of the CORESET associated with a first SS set for monitoring DO 2_0 or a COREST associated with a second SS set in which the UE monitors the PDCCH.

14. The method of any one of claims 3 to 13, wherein the UE is configured by the base station, with a configuration between a beam-level SSSG switch function with the beam direction relevant information and a SSSG switch function without the beam direction relevant information.

15. A wireless communication method by a base station, comprising: configuring to a user equipment (UE), a first search space set group (SSSG) and a second SSSG; and controlling the UE to monitor a physical downlink control channel (PDCCH) according to search space (SS) sets in the first SSSG and/or the second SSSG through a first information from the base station.

16. A user equipment (UE), comprising: a memory; a transceiver; and a processor coupled to the memory and the transceiver; wherein the processor is configured to perform the method of any one of claims 1 to 14.

17. A base station, comprising: a memory; a transceiver; and a processor coupled to the memory and the transceiver; wherein the processor is configured to perform the method of claim 15.

18. A non-transitory machine-readable storage medium having stored thereon instructions that, when executed by a computer, cause the computer to perform the method of any one of claims 1 to 15.

19. A chip, comprising: a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the method of any one of claims 1 to 15.

20. A computer readable storage medium, in which a computer program is stored, wherein the computer program causes a computer to execute the method of any one of claims 1 to 15.

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