Beam determination method and device

Abstract

The embodiment of the invention relates to a beam determination method and device. An exemplary method includes receiving a PRACH resource in a BWP of a serving cell; determining a QCL property of a DMRS port of the PDCCH in response to the PRACH resource at least based on whether a plurality of CORESET pool index values are configured for CORESET in the BWP of the serving cell and whether a plurality of TAGs are configured in the serving cell, or whether inter-cell mobility based on L1 / L2 is configured in the serving cell; and transmitting the PDCCH based on the determined QCL property of the DMRS port of the PDCCH.

Description

Technical Field

[0001] Embodiments of the present application generally relate to wireless communication technology, and more particularly to methods and devices for beam determination, for example, beam determination in scenarios of multiple transmit-receive points (TRPs) (M-TRPs) based on multiple downlink control information (DCI) (M-DCI) or layer 1 (L1) / layer 2 (L2) triggered mobility (or L1 / L2 triggered mobility or L1 / L2-based mobility). Background Art

[0002] It is known that M-TRP based on inter-cell M-DCI is specified in the (R)17 release of Multiple Input Multiple Output (MIMO), and it has been agreed that dual timing advance (TA) enhancements for M-TRP based on inter-cell and intra-cell M-DCI will be supported in R18. For example, a MIMO-related work item (WI) was approved in R18, in which the topic of multi-TRP / panel uplink (UL) transmission will be studied, and if reasonable, two TAs for UL M-DCI for multi-TRP operation are specified. In addition, there is another WID in NR R18, namely, L1 / L2 triggered mobility (or L1 / L2 triggered mobility), which also includes TA enhancement. Therefore, TA enhancements for inter-cell cases are studied in both R18 MIMO and R18 L1 / L2 triggered mobility (or L1 / L2 triggered mobility).

[0003] It is also known that TA acquisition is performed through a random access channel (RACH) process. A physical random access channel (PRACH) (or PRACH resources or preamble) will be transmitted to the TRP to obtain the TA of the TRP, or to the candidate cell to obtain the TA of the candidate cell. However, in the scenario of M-TRP based on M-DCI or in the scenario of L1 / L2 triggered mobility (or L1 / L2 triggered mobility), the beam determination mechanisms of the physical downlink shared channel (PDSCH) and the physical downlink control channel (PDCCH) related to PRACH transmission (or related to PRACH resources, etc.) are not suitable for TA enhancement.

[0004] In view of the above, in the scenario of M-TRP based on M-DCI or in the scenario of L1 / L2 triggered mobility (or L1 / L2 triggered mobility), the industry needs to at least study and solve the technical problems regarding the beam determination of PDCCH and PDSCH related to PRACH transmission considering TA enhancement. Summary of the invention

[0005] One purpose of an embodiment of the present application is to provide a technical solution for beam determination, for example, a technical solution for beam determination of PDCCH commands, PDCCH and PDSCH related to PRACH transmission, which can be applied to M-DCI-based M-TRP scenarios with TA enhancement and L1 / L2 triggered mobility (or L1 / L2 triggered mobility) scenarios.

[0006] Some embodiments of the present application provide a wireless communication device, such as a user equipment (UE), comprising: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: transmit PRACH resources in a bandwidth part (BWP) of a serving cell; determine a quasi-co-located (QCL) property of a demodulation reference signal (DMRS) port of a PDCCH in response to the PRACH resources based at least on whether multiple CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell and whether multiple timing advance groups (TAGs) are configured in the serving cell, or whether layer 1 / layer 2 (L1 / L2) triggered mobility is configured in the serving cell; and receive the PDCCH based on the determined QCL property of the DMRS port of the PDCCH.

[0007] Some other embodiments of the present application provide a wireless communication method, for example, a method performed by a UE, comprising: receiving a PRACH resource in a BWP of a serving cell; determining a QCL property of a DMRS port of a PDCCH in response to the PRACH resource based at least on whether multiple CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell and whether multiple TAGs are configured in the serving cell, or whether L1 / L2 triggered mobility is configured in the serving cell; and transmitting the PDCCH based on the determined QCL property of the DMRS port of the PDCCH.

[0008] In some embodiments of the present application, determining the QCL property of the DMRS port of the PDCCH includes: determining the DMRS port of the PDCCH and at least one reference signal (RS) QCL associated with a transmission configuration indication (TCI) state of a CORESET in which the PDCCH is received in response to: two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell; or L1 / L2 triggered mobility is configured in the serving cell; or two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional physical cell identifier (PCI), and the PRACH resource is associated with the additional PCI; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resources are associated with an additional PCI or a candidate cell; or two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resources are associated with a CORESET pool index value different from the CORESET pool index value of the CORESET in which the PDCCH is received; or two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and only one type 1 common search space (CSS) associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the additional PCI.

[0009] In some embodiments of the present application, determining the QCL property of the DMRS port of the PDCCH includes: determining the QCL property of the DMRS port of the PDCCH and the synchronization signal (SS) / physical broadcast channel (PBCH) block (SSB) resource or channel state information (CSI)-RS resource QCL used to transmit the PRACH resource in response to: two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and the PRACH resource is associated with the PCI of the serving cell; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with the PCI of the serving cell; or two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, And the PRACH resource is associated with the CORESET pool index value of the CORESET in which the PDCCH is received; or two CORESET pool index values ​​in different CORESETs are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and an additional type 1 CSS associated with the CORESET associated with the additional PCI is configured, or two CORESET pool index values ​​in different CORESETs are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the PCI of the serving cell.

[0010] In some embodiments of the present application, the processor is further configured to determine the QCL property of the DMRS port of the PDSCH scheduled by the PDCCH, which includes: determining the QCL property of the DMRS port of the PDSCH based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured, wherein: when the parameter "dl-OrJoint-TCIStateList-r17" is not configured, two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, the PDSCH is determined. The DMRS port is associated with the following QCL: at least one RS associated with a TCI state of a CORESET in which the PDCCH is received in response to a time offset between the reception of the PDCCH and the PDSCH being greater than or equal to a threshold; or at least one RS associated with a TCI state of a CORESET, the CORESET being associated with a monitored search space having a lowest CORESET identifier among the CORESETs with the same CORESET pool index value configured with the PDCCH in the latest time slot, wherein the monitored search space is associated with the CORESET pool index value of the PDCCH in response to the time offset between the reception of the PDCCH and the PDSCH being less than the threshold. one or more CORESETs associated with the same CORESET pool index value, at least one configured TCI state of the serving cell of the PDSCH contains the parameter "qcl-Type" set to 'typeD' and the parameter "enableDefaultTCI-StatePerCoresetPoolIndex" is configured; or the parameter "dl-OrJoint-TCIStateList-r17" is configured, two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, determining the PDSCH The DMRS port of the SCH is associated with the following QCL: at least one RS associated with the joint or downlink TCI state applicable in the time slot in which the PDSCH is received and associated with the same CORESET pool index of the CORESET in which the PDCCH is received; or when the configuration parameter "dl-OrJoint-TCIStateList-r17" is configured and L1 / L2 triggered mobility is configured in the serving cell, the DMRS port of the PDSCH is determined to be associated with the following QCL: at least one RS associated with the joint or downlink TCI state applicable in the time slot in which the PDSCH is received.

[0011] According to some embodiments of the present application, the processor is configured to determine the QCL property of the DMRS port of the PDSCH based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured in the following cases: two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and the PRACH resource is associated with the additional PCI; or two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell TAG, and the PRACH resources are associated with a CORESET pool index value different from the CORESET in which the PDCCH is received; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resources are associated with an additional PCI or a candidate cell; or two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the additional PCI.

[0012] In some embodiments of the present application, the processor is further configured to determine the QCL property of the DMRS port of the PDSCH scheduled by the PDCCH, which includes: determining the QCL of the DMRS port of the PDSCH and the SSB resource or CSI-RS resource used to transmit the PRACH resource in response to the following: two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and the PRACH resource is associated with the PCI of the serving cell; or two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with the CORESET pool index of the CORESET in which the PDCCH is received. value; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resources are associated with the PCI of the serving cell; or two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and an additional type-1 CSS associated with the CORESET associated with the additional PCI is configured; or two CORESET pool indexes or CORESETs are configured in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type-1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the transmission of the PRACH resources is associated with the PCI of the serving cell.

[0013] In some embodiments of the present application, the transmission of the PRACH resource is initiated by a PDCCH command, and the processor is further configured to determine the QCL property of the DMRS port of the PDCCH command, which includes: in response to configuring two CORESET pool index values ​​for the CORESET in the BWP of the serving cell and configuring two TAGs in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell, and the PRACH resource is associated with an additional PCI or a candidate cell to determine the DMRS port of the PDCCH command and at least one RS QCL of the TCI state of the CORESET in which the PDCCH command is transmitted; or in response to configuring L1 / L2 triggered mobility in the serving cell, and the PRACH resource is associated with the PCI of the serving cell to determine the DMRS port of the PDCCH command and the SSB resource or CSI-RS resource QCL used to transmit the PRACH resource.

[0014] Some other embodiments of the present application provide another wireless communication device, for example, a radio access network (RAN) node, comprising: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: receive PRACH resources in a BWP of a serving cell; determine a QCL property of a DMRS port of a PDCCH in response to the PRACH resources based at least on whether multiple CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell and whether multiple TAGs are configured in the serving cell, or whether L1 / L2 triggered mobility is configured in the serving cell; and transmit the PDCCH based on the determined QCL property of the DMRS port of the PDCCH.

[0015] In some embodiments of the present application, determining the QCL property of the DMRS port of the PDCCH includes: determining the DMRS port of the PDCCH and at least one RS QCL associated with the TCI state of the CORESET in which the PDCCH is transmitted in response to: two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell; or L1 / L2 triggered mobility is configured in the serving cell; or two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and the PRACH resources are associated with the additional PCI; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resources are associated with an additional PCI or a candidate cell; or in the BW of the serving cell. Two CORESET pool index values ​​are configured for CORESET in the P, two TAGs are configured in the serving cell, and the PRACH resource is associated with a CORESET pool index value that is different from the CORESET pool index value of the CORESET in which the PDCCH is transmitted; or two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the additional PCI.

[0016] In some embodiments of the present application, determining the QCL property of the DMRS port of the PDCCH includes: determining the QCL of the DMRS port of the PDCCH and the SSB resource or CSI-RS resource for receiving the PRACH resource in response to: configuring two CORESET pool index values ​​for CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and the PRACH resource is associated with the PCI of the serving cell; or configuring L1 / L2 triggered mobility in the serving cell, and the PRACH resource is associated with the PCI of the serving cell; or configuring two CORESET pool index values ​​for CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, and the PRACH resource is associated with the PCI of the serving cell. The PDCCH is associated with the CORESET pool index value of the CORESET of the PDCCH; or two CORESET pool index values ​​in different CORESETs are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and an additional type 1 CSS associated with the CORESET associated with the additional PCI is configured; or two CORESET pool index values ​​in different CORESETs are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the PCI of the serving cell.

[0017] According to some embodiments of the present application, the processor is further configured to determine the QCL property of the DMRS port of the PDSCH scheduled by the PDCCH, which includes: determining the QCL property of the DMRS port of the PDSCH based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured, wherein: when the parameter "dl-OrJoint-TCIStateList-r17" is not configured, two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, the PDSCH is determined. The DMRS port of the QCL is associated with the following QCL: at least one RS associated with the TCI state of a CORESET in which the PDCCH is transmitted in response to a time offset between the transmission of the PDCCH and the PDSCH being greater than or equal to a threshold; or at least one RS associated with the TCI state of a CORESET, the CORESET being associated with a monitored search space with a lowest CORESET identifier among the CORESETs with the same CORESET pool index value configured with the PDCCH in the latest time slot, wherein the monitored search space is associated with the CORESET pool index value of the PDCCH in response to the time offset between the transmission of the PDCCH and the PDSCH being less than the threshold. one or more CORESETs associated with the same CORESET pool index value, at least one configured TCI state of the serving cell of the PDSCH contains the parameter "qcl-Type" set to 'typeD' and the parameter "enableDefaultTCI-StatePerCoresetPoolIndex" is configured; or the parameter "dl-OrJoint-TCIStateList-r17" is configured, two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, determining the The DMRS port of the PDSCH is associated with the following QCL: at least one RS associated with the joint or downlink TCI state applicable in the time slot in which the PDSCH is transmitted and associated with the same CORESET pool index of the CORESET in which the PDCCH is transmitted; or when the configuration parameter "dl-OrJoint-TCIStateList-r17" is configured and L1 / L2 triggered mobility is configured in the serving cell, the DMRS port of the PDSCH is determined to be associated with the following QCL: at least one RS associated with the joint or downlink TCI state applicable in the time slot in which the PDSCH is transmitted.

[0018] According to some embodiments of the present application, the processor is configured to determine the QCL property of the DMRS port of the PDSCH based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured in the following cases: two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and the PRACH resource is associated with the additional PCI; or two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell. two TAGs, and the PRACH resources are associated with a CORESET pool index value different from the CORESET in which the PDCCH is transmitted; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resources are associated with an additional PCI or a candidate cell; or two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the additional PCI.

[0019] In some embodiments of the present application, the processor is further configured to determine the QCL property of the DMRS port of the PDSCH scheduled by the PDCCH, which includes: determining the QCL of the DMRS port of the PDSCH and the SSB resource or CSI-RS resource for receiving the PRACH resource in response to the following: two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and the PRACH resource is associated with the PCI of the serving cell; two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with the CORESET pool index value of the CORESET in which the PDCCH is transmitted associated; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resources are associated with the PCI of the serving cell; or two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, and an additional type 1 CSS associated with the CORESET associated with the additional PCI is configured; or two CORESET pool indexes or CORESETs are configured in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the transmission of the PRACH resources is associated with the PCI of the serving cell.

[0020] In some embodiments of the present application, the transmission of the PRACH resources is initiated by a PDCCH command, and the processor is further configured to determine the QCL property of the DMRS port of the PDCCH command, which includes: in response to configuring two CORESET pool index values ​​for the CORESET in the BWP of the serving cell and configuring two TAGs in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell, and the PRACH resources are associated with an additional PCI or a candidate cell to determine the DMRS port of the PDCCH command and at least one RS QCL of the TCI state of the CORESET in which the PDCCH command is transmitted; or in response to configuring L1 / L2 triggered mobility in the serving cell, and the PRACH resources are associated with the PCI of the serving cell to determine the DMRS port of the PDCCH command and the SSB resource or CSI-RS resource QCL used to receive the PRACH resource.

[0021] In view of the above, an embodiment of the present application provides a technical solution for beam determination, which solves the beam determination problem in multi-TRP scenarios based on multi-DCI with TA enhancement and L1 / L2 triggered mobility scenarios, and thus can promote and improve the implementation of NR. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to describe the manner in which the advantages and features of the present application can be obtained, the description of the present application is presented by reference to specific embodiments of the application illustrated in the accompanying drawings. These drawings depict only example embodiments of the present application and therefore should not be considered limiting of its scope.

[0023] Figure 1 is a schematic diagram illustrating an exemplary wireless communication system according to an embodiment of the present application.

[0024] Figure 2 is a schematic diagram illustrating a RACH process for TA acquisition according to some embodiments of the present application.

[0025] Figure 3 A flow chart illustrating a method of beam determination according to some embodiments of the present application.

[0026] Figure 4 A block diagram illustrating an apparatus for beam determination according to some embodiments of the present application.

[0027] Figure 5 A block diagram illustrating an apparatus for beam determination according to some other embodiments of the present application. DETAILED DESCRIPTION

[0028] The detailed description of the accompanying drawings is intended as a description of the preferred embodiments of the present application, and is not intended to represent the only form in which the present application can be practiced. It should be understood that the same or equivalent functions can be implemented by different embodiments intended to be included in the spirit and scope of the present application.

[0029] Reference will now be made in detail to some embodiments of the present application, examples of which are illustrated in the accompanying drawings. For ease of understanding, embodiments are provided under specific network architectures and new service scenarios (e.g., 3rd Generation Partnership Project (3GPP) 5G, 3GPP Long Term Evolution (LTE), etc.). It is considered that, with the development of network architectures and new service scenarios, all embodiments in the present application are also applicable to similar technical problems; and in addition, the terms stated in the present application may be changed, which should not affect the principles of the present application.

[0030] Figure 1 A schematic diagram illustrating an exemplary wireless communication system 100 in accordance with some embodiments of the present application.

[0031] like Figure 1 As shown in FIG. 1 , a wireless communication system 100 includes a UE 103 and a base station (BS) 101. Although for simplicity, Figure 1 Only one BS is illustrated in FIG. 1 , but it is considered that in some other embodiments of the present application, the wireless communication system 100 may include more BSs. Similarly, although for simplicity, in Figure 1 Only one UE is illustrated in the figure, but it is considered that in some other embodiments of the present application, the wireless communication system 100 may include more UEs.

[0032] The wireless communication system 100 is compatible with any type of network capable of sending and receiving wireless communication signals. For example, the wireless communication system 100 is compatible with wireless communication networks, cellular telephone networks, networks based on time division multiple access (TDMA), networks based on code division multiple access (CDMA), networks based on orthogonal frequency division multiple access (OFDMA), LTE networks, networks based on 3GPP, 3GPP 5G networks, satellite communication networks, high altitude platform networks, and / or other communication networks.

[0033] BS 101 may also be referred to as an access point, an access terminal, a base, a macro cell, a Node B, an enhanced Node B (eNB), a gNB, a home Node B, a relay node or a device, or described using other terms used in the art. BS 101 is typically part of a radio access network, which may include a controller communicatively coupled to BS 101.

[0034] In addition, BS101 may be configured with one transmit-receive point (TRP) (or panel), i.e., in a single TRP scenario, or configured with multiple TRPs (or panels), i.e., a multi-TRP scenario. That is, one or more TRPs are associated with BS101. The TRP may act as a small BS. Two TRPs may have the same cell ID (identifier or index) or different cell IDs. The two TRPs may communicate with each other via a backhaul link. Such a backhaul link may be an ideal backhaul link or a non-ideal backhaul link. The latency of an ideal backhaul link may be considered to be zero, and the latency of a non-ideal backhaul link may be tens of milliseconds, and may even be much larger than the latency of an ideal backhaul link, for example, on the order of tens of milliseconds.

[0035] A single TRP may be used to serve one or more UEs 103 under the control of BS 101. In different scenarios, TRP may be referred to by different terms, which may be represented by a TCI state index or a CORESETPoolIndex value, etc. It should be understood that the TRP (or panel) configured for BS 101 may be transparent to UE 103.

[0036] UE 103 may include a computing device, such as a desktop computer, a laptop computer, a personal digital assistant (PDA), a tablet computer, a smart TV (e.g., a TV connected to the Internet), a set-top box, a game console, a security system (including a security camera), a car computer, a network device (e.g., a router, a switch and a modem), etc. According to an embodiment of the present application, UE 103 may include a portable wireless communication device, a smart phone, a cellular phone, a flip phone, a device with a subscriber identity module, a personal computer, a selective call receiver, or any other device capable of sending and receiving communication signals on a wireless network. In some embodiments of the present application, UE 103 may include a wearable device, such as a smart watch, a fitness bracelet, an optical head-mounted display, etc. In addition, UE 103 may be referred to as a subscriber unit, a mobile device, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal or a device, or described using other terms used in the art. UE 103 may move among different cells. Conventionally, serving cell change is performed through explicit radio resource control (RRC) reconfiguration signaling to trigger synchronization of the target cell based on layer 3 (L3) measurement reports. In 3GPP R18, a new work item on further NR mobility enhancements was approved to enable serving cell change via lower layer signaling (e.g., L1 or L2 signaling) in order to reduce latency, overhead, and outage time.

[0037] In both R18 MIMO and R18 L1 / L2 triggered mobility, TA enhancement for inter-cell cases is studied. However, the current mechanism of PDCCH and beam determination of PDCCH related to TA acquisition performed through RACH procedure is not suitable for M-DCI-based M-TRP and L1 / L2 triggered mobility supporting TA enhancement (e.g., 2-TA enhancement).

[0038] Figure 2 is a schematic diagram illustrating a RACH process for TA acquisition according to some embodiments of the present application.

[0039] According to the conventional specification, the beams of the PDSCH and PDCCH associated with PRACH transmission (indicated by RS, e.g., CSI-RS or SSB, or spatial relation filter, TCI state, or QCL property of a DMRS port, etc.) are always the same as the beams used for PRACH transmission. The PDCCH associated with PRACH transmission is also referred to as PDCCH carrying random access response (RAR) or PDCCH RAR, etc.; and the PDSCH associated with PRACH transmission is also referred to as PDSCH carrying RAR or PDSCH RAR, etc.

[0040] In addition, according to the traditional specification, if the RACH process is a contention-free random access (CFRA) triggered by a PDCCH command of a special cell (SpCell), the beams of the PDCCH command, PDCCH RAR and PDSCH RAR are the same as the beams of the PRACH. According to the agreement in AI 9.1.1.2 of RAN1#111, in the scenario of M-TRP based on M-DCI, a PDCCH command from one TRP can trigger CFRA towards another TRP in the scenario of M-TRP based on inter-cell M-DCI.

[0041] like Figure 2 As shown in FIG. 2 , during the RACH process for obtaining a TA, for example, during a CFRA triggered by a PDCCH command of the SpCell, the UE will transmit a PRACH (PRACH resources or preamble, etc.) in step 203, which is initiated or triggered by a PDCCH command received from the network side in step 201. The UE will then receive a PDCCH RAR associated with the PRACH in step 205, and then receive a PDSCH RAR scheduled by the PDCCH RAR in step 207.

[0042] In the scenario of M-TRP based on M-DCI, PDCCH RAR and its scheduled PDSCH RAR are always transmitted from the same TRP (e.g., TRP1 (or TRP2)), while PDCCH RAR is transmitted in Type 1 CSS, which is transmitted from only one TRP (e.g., TRP1). Assuming that the UE will transmit PRACH to TRP2 in step 203, the PRACH is initiated by the PDCCH command received from TRP1 in step 201. If PDCCH RAR is received from TRP1 by the UE in step 205, then PDSCH RAR will also be received from TRP1 by the UE in step 207, and the UE cannot use the beam of PRACH towards TRP2.

[0043] In addition, since in the M-TRP scenario based on inter-cell M-DCI, a PDCCH command from one TRP (e.g., TRP1) can trigger a CFRA toward another TRP (e.g., TRP2), the beam of the PDCCH command cannot always be the same as the beam of the triggered PRACH. As stated above, the PDCCH RAR is always transmitted from the Type 1 CSS that can only be transmitted from one TRP. Therefore, the beam of the PDCCH RAR cannot always be the same as the beam of the PRACH, because the PRACH can be transmitted to another TRP to obtain the TA of the other TRP. Therefore, in the M-TRP scenario based on M-DCI, the beam determination of the PDCCH command and the PDCCH RAR should also be enhanced for TA enhancement.

[0044] Regarding the scenario of L1 / L2 triggered mobility (where it is assumed that TA enhancement will always be supported), since PDCCH RAR and PDSCH RAR can only be transmitted from the serving cell, and PRACH should be transmitted to the candidate cell to obtain the TA of the candidate cell, there are problems similar to those analyzed above in the scenario of M-TRP based on M-DCI.

[0045] At least to solve the above-mentioned technical problems, the embodiments of the present application provide a technical solution for beam determination, for example, a method and device for beam determination in an M-DCI-based M-TRP scenario supporting TA enhancement and an L1 / L2 triggered mobility scenario supporting TA enhancement.

[0046] Figure 3A flowchart illustrating a method of beam determination according to some embodiments of the present application. Although the method is described at the system level by a UE in the remote side (or UE side) and a BS in the network side (or BS side), it should be understood by those skilled in the art that the method implemented in the remote side and the method implemented in the network side can be implemented separately and incorporated by other devices with similar functions. In addition, any transmission or reception failure is not considered in the illustrated embodiments of the present application.

[0047] like Figure 3 As shown in FIG. 301, in step 301, a wireless communication device in a remote side (e.g., a UE) may transmit PRACH resources in a BWP of a serving cell. For example, the transmission of PRACH resources (or the transmission of PRACH) is initiated by a PDCCH command from the network side, so that CFRA is triggered by a PDCCH command of the SpCell. In some other embodiments of the present application, the transmission of PRACH resources is triggered or initiated for contention-based random access (CBRA). Therefore, the network side (e.g., a gNB) will receive PRACH resources in a BWP of a serving cell in step 302.

[0048] In step 303, the remote side (e.g., UE) will determine the beam of the PDCCH in response to the PRACH (e.g., PDCCH RAR) based at least on whether the UE is configured in M-DCI-based M-TRP with TA enhancement or whether the UE is configured in L1 / L2 triggered mobility. The beam of the PDCCH may be indicated by the QCL property of the DMRS port of the PDCCH or other means. In step 304, a similar determination will be performed in the network side (e.g., by the gNB).

[0049] There are multiple ways to determine whether the UE is configured in M-DCI-based M-TRP with TA enhancement or whether the UE is configured in L1 / L2 triggered mobility. For example, it will be determined whether multiple CORESET pool index values ​​(e.g., CORESETPoolIndex values, each corresponding to a TRP) are configured for the CORESET in the BWP of the serving cell, and whether multiple TAGs are configured in the serving cell to determine whether the UE is configured in M-DCI-based M-TRP with TA enhancement. In another example, it will be determined whether L1 / L2 triggered mobility is configured in the serving cell to determine whether the UE is configured in L1 / L2 triggered mobility.

[0050] Based on the determined beam, e.g., the determined QCL property of the DMRS port of the PDCCH, the network side (e.g., gNB) will transmit the PDCCH in step 306. Therefore, based on the determined beam, e.g., the determined QCL property of the DMRS port of the PDCCH, the remote side (e.g., UE) will receive the PDCCH in step 307. The PDCCH schedules a PDSCH (e.g., PDSCH RAR) associated with the PRACH.

[0051] In some embodiments of the present application, the beam of the PDSCH (e.g., PDSCH RAR) scheduled by the PDCCH, for example, the QCL property of the DMRS port of the PDSCH will also be determined based on at least whether the UE is configured in M-TRP based on M-DCI with TA enhancement, or whether the UE is configured in L1 / L2 triggered mobility. The PDSCH will be transmitted from the network side to the remote side using the determined beam of the PDSCH, for example, based on the QCL property of the DMRS port of the PDSCH.

[0052] In some scenarios, for example, in a CFRA triggered by a PDCCH command of a SpCell, the transmission of PRACH resources is initiated by a PDCCH command. According to some embodiments of the present application, the beam of the PDCCH command that initiates (or triggers) the transmission of PRACH resources (for example, the QCL property of the DMRS port of the PDCCH command) will also be determined based on at least whether the UE is configured in M-TRP based on M-DCI with TA enhancement or whether the UE is configured in L1 / L2 triggered mobility. The PDCCH command will be transmitted from the network side to the remote side using the determined beam, for example, based on the QCL property of the DMRS port of the PDCCH command.

[0053] The following will explain more detailed embodiments of the present application in view of PDCCH, PDSCH and PDCCH commands respectively. Since the technical solution of the present application mainly focuses on beam determination in M-DCI-based M-TRP scenarios with TA enhancement and L1 / L2 triggered mobility scenarios, this article always assumes that the UE is in M-DCI-based M-TRP scenarios with TA enhancement and L1 / L2 triggered mobility scenarios. One or more signalings (e.g., RRC signaling) will be used to indicate whether the UE is configured with M-DCI-based M-TRP supporting TA enhancement, or configured with L1 / L2 triggered mobility for TA acquisition of candidate cells (or additional PCIs). M-DCI-based M-TRP (or M-DCI-based M-TRP scenario) can be an inter-cell M-DCI-based M-TRP or an intra-cell M-DCI-based M-TRP. For example, if two different CORESETPoolIndex values ​​are configured in the BWP of the serving cell and 2 TAGs are configured in the serving cell, it will be identified as supporting 2-TA enhanced M-DCI-based M-TRP. If a configuration or parameter (e.g., RRC parameter (e.g., "L1 / L2 mobility", etc.)) meaning L1 / L2 triggered mobility is configured in the serving cell, it will be identified as L1 / L2 triggered mobility.

[0054] It should be well known to those skilled in the art that although some configurations and / or parameters, such as "dl-OrJoint-TCIStateList-r17" and "PDCCH-Config", are well known in traditional specifications, they may evolve into other terms as 3GPPP evolves. Therefore, the names of such configurations and / or parameters should not be used to overly limit the scope of the present application, and should be reasonably interpreted with their technical substance. In addition, although some embodiments are described only in view of one side (e.g., the network side or the remote side), those skilled in the art will clearly determine how to consistently apply the technical solution in the other side based on the consistency between the network side and the remote side.

[0055] PDCCH beam determination

[0056] According to some embodiments of the present application, the PDCCH (e.g., PDCCH RAR) in response to the PRACH resource is a PDCCH (DCI format 1_0) with a cyclic redundancy check (CRC) scrambled by a random access (RA) radio network temporary identifier (RNTI) (RA-RNTI) or MSGB-RNTI. In other words, the exemplary PDCCH is a PDCCH with DCI format 1_0 and a CRC scrambled by RA-RNTI, or a PDCCH with DCI format 1_0 and a CRC scrambled by MSGB-RNTI, transmitted in response to a PRACH initiated by a PDCCH command that triggers a CFRA procedure of the SpCell.

[0057] Regarding the beam determination of the PDCCH, in some embodiments of the present application, the beam of the PDCCH is always the same as the beam of the CORESET in which the PDCCH is transmitted (or the CORESET associated with the type 1 CSS set in which the PDCCH is transmitted) (or the CORESET in which the PDCCH is received for the remote side). The type 1 CSS set in which the PDCCH is transmitted or received is also referred to as a type 1 PDCCH CSS set configured to be associated with the CORESET. In some other embodiments of the present application, the beam of the PDCCH is the same as the beam of the CORESET in which the PDCCH is transmitted under some conditions, and the same as the beam used for PRACH transmission under some other conditions, for example, the same as the SSB resource or CSI-RS resource used for PRACH transmission.

[0058] For example, in some embodiments of the present application, determining the QCL property of the DMRS port of the PDCCH in step 203 (similar to step 204) includes: determining the DMRS port of the PDCCH and at least one RS QCL associated with the TCI state of the CORESET in which the PDCCH is received (or the CORESET in which the PDCCH is transmitted in step 204) in response to:

[0059] a) Two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell; or

[0060] b) configure L1 / L2 triggered mobility in the serving cell; or

[0061] c) two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with the additional PCI, and the PRACH resources are associated with the additional PCI; or

[0062] d) L1 / L2 triggered mobility is configured in the serving cell and the PRACH resources are associated with additional PCI or candidate cells; or

[0063] e) two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with a CORESET pool index value that is different from the CORESET pool index value of the CORESET in which the PDCCH is received; or

[0064] f) Two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the additional PCI.

[0065] In some other embodiments of the present application, determining the QCL property of the DMRS port of the PDCCH in step 203 (similar to step 204) includes: determining the QCL of the DMRS port of the PDCCH and the SSB resource or CSI-RS resource used to transmit the PRACH resource in response to:

[0066] a) Two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with the additional PCI, and the PRACH resources are associated with the PCI of the serving cell; or

[0067] b) L1 / L2 triggered mobility is configured in the serving cell and the PRACH resources are associated with the PCI of the serving cell; or

[0068] c) two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resources are associated with the CORESET pool index value of the CORESET in which the PDCCH is received; or

[0069] d) two CORESET Pool Index values ​​in different CORESETs are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with the additional PCI, and one additional Type 1 CSS associated with the CORESET associated with the additional PCI is configured, or

[0070] e) Two CORESET pool index values ​​in different CORESETs are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the PCI of the serving cell.

[0071] Some exemplary situations are described below.

[0072] Situation 1-1

[0073] According to some embodiments of the present application, regardless of M-TRP based on M-DCI with TA enhancement or L1 / L2 triggered mobility scenarios, the beam of the PDCCH will always be the same as the beam of the CORESET in which the PDCCH is transmitted (or received). That is, the UE may assume the DMRS antenna port QCL property of the CORESET associated with the type-1 PDCCH CSS set for receiving the PDCCH, or the UE may assume the DMRS antenna port QCL property of the CORESET associated with the type-1 PDCCH CSS set to be used to receive the PDCCH.

[0074] Situation 1-2

[0075] In some other embodiments of the present application, the beam of the PDCCH will be the same as the beam of the CORESET in which the PDCCH is transmitted (or received) or the same as the beam used for PRACH transmission, depending on different specific configurations of the UE.

[0076] For example, in some exemplary scenarios of inter-cell M-DCI based M-TRP or L1 / L2 triggered mobility with TA enhancement, for example, in the case where the UE is configured by a higher layer parameter "PDCCH-Config" with two different "coresetPoolIndex" values ​​in the "ControlResourceSets" of the BWP of the serving cell, and at least one activated joint or downlink TCI state is associated with an additional PCI, or if the UE is configured with L1 / L2 triggered mobility, the beam of the PDCCH will be determined as follows. In the case where the corresponding PRACH transmission is associated with the serving cell PCI, the beam of the PDCCH will be determined to be the same as the beam used for PRACH transmission. This means that the UE can assume that the DMRS port of the PDCCH is quasi-co-located with the SSB resources or CSI-RS resources used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial receive (RX) parameters (when applicable). Otherwise, in case the corresponding PRACH transmission is associated with an additional PCI, the beam of the PDCCH shall be determined to be the same as the beam of the CORESET associated with the type 1 CSS set in which the PDCCH is transmitted (or received).

[0077] In some exemplary scenarios of M-TRP based on intra-cell M-DCI, for example, in the case where the UE is configured by a higher layer parameter "PDCCH-Config" containing two different "coresetPoolIndex" values ​​in the "ControlResourceSets" of the BWP of the serving cell, the beam of the PDCCH will be determined as follows. In the case where the corresponding PRACH transmission is associated with the same CORESETPoolIndex value of the CORESET in which the PDCCH is transmitted (or received), the beam of the PDCCH will be the same as the beam used for the PRACH transmission. This means that the UE can assume that the DMRS port of the PDCCH is quasi-co-located with the SSB resources or CSI-RS resources used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable). Otherwise, the beam of the PDCCH will be determined to be the same as the beam of the CORESET associated with the type 1 CSS set in which the PDCCH is transmitted (or received).

[0078] Situation 1-3

[0079] Similar to case 1-2, in some other embodiments of the present application, the beam of the PDCCH is the same as the beam of the CORESET in which the PDCCH is transmitted or the same as the beam used to transmit the PRACH, depending on the different specific configurations of the UE. However, case 1-3 is only applicable to M-TRP based on inter-cell M-DCI.

[0080] For example, in some exemplary scenarios of M-TRP based on inter-cell M-DCI, for example, the UE is configured by a higher layer parameter "PDCCH-Config" with two different "coresetPoolIndex" values ​​in the "ControlResourceSets" of the BWP containing the serving cell, and at least one activated joint or downlink TCI state is associated with an additional PCI, the beam of the PDCCH will be determined as follows.

[0081] In case of configuring an additional Type 1 CSS associated with a CORESET associated with an additional PCI, the beam of the PDCCH will be the same as the beam used for PRACH transmission. This means that the UE can assume that the DMRS port of the PDCCH is quasi-co-located with the SSB source or CSI-RS resource used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable).

[0082] Otherwise, in the case where only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the PCI of the serving cell, the beam of the PDCCH will be the same as the beam used for PRACH transmission. In the case where only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, the beam of the PDCCH will be determined to be the same as the beam of the CORESET in which the PDCCH is transmitted (or received).

[0083] PDSCH Beam Determination

[0084] According to some embodiments of the present application, the PDSCH scheduled by the PDCCH in response to the PRACH resource is a PDSCH scheduled with RA-RNTI or MSGB-RNTI with a CRC scrambled by RA-RNTI or MSGB-RNIT, and scheduled by DCI format 1_0 (or a PDCCH with DCI format 1_0). Therefore, there is no TCI field in the DCI in the PDCCH that schedules the PDSCH (also referred to as scheduling DCI).

[0085] Regarding the beam determination of PDSCH, in some embodiments of the present application, the beam of PDSCH is always determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17". In the case where the UE is not configured with "dl-OrJoint-TCIStateList-r17" (which implies that the unified architecture is not applicable to the UE), the beam of PDSCH will be determined as R15 and R16 specifications. In the case where the UE is configured with "dl-OrJoint-TCIStateList-r17" (which implies that the unified architecture is applicable to the UE), the beam of PDSCH will be determined as R17 specification.

[0086] For example, in some embodiments of the present application, determining the QCL property of the DMRS port of the PDSCH scheduled by the PDCCH includes: determining the QCL property of the DMRS port of the PDSCH based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured.

[0087] In the case where the parameter "dl-OrJoint-TCIStateList-r17" is not configured, two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, the DMRS port of the PDSCH shall be determined by the UE, for example, as corresponding to the following QCL:

[0088] a) at least one RS associated with a TCI state of a CORESET in which a PDCCH is transmitted or received in response to a time offset between reception of a PDCCH and a PDSCH being greater than or equal to a threshold; or

[0089] b) at least one RS associated with a TCI state of a CORESET, wherein the CORESET is associated with a monitored search space with a lowest CORESET identifier among the CORESETs configured with the same CORESET pool index value of the PDCCH in the latest time slot, wherein in response to a time offset between reception of the PDCCH and the PDSCH being less than a threshold, one or more CORESETs associated with the same CORESET pool index value are monitored, and at least one configured TCI state of the serving cell of the PDSCH contains the parameter 'qcl-Type' set to 'typeD' and the configuration parameter 'enableDefaultTCI-StatePerCoresetPoolIndex'.

[0090] In case of configuration parameter "dl-OrJoint-TCIStateList-r17" and in an exemplary scenario of M-DCI based M-TRP with TA enhancement, for example, two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell and two TAGs are configured in the serving cell, the DMRS port for the PDSCH shall, for example, be determined by the UE as the following QCL: at least one RS associated with the joint or downlink TCI state applicable in the timeslot in which the PDSCH is received and associated with the same CORESET pool index of the CORESET in which the PDCCH is received.

[0091] In case the parameter “dl-OrJoint-TCIStateList-r17” is configured and L1 / L2 triggered mobility is configured in the serving cell, the DMRS port of the PDSCH shall be determined, for example by the UE, as at least one RS QCL associated with the joint or downlink TCI state applicable in the time slot in which the PDSCH is received.

[0092] In some other embodiments of the present application, the beam of PDSCH will be determined under some conditions based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17", and the beam of PDCCH will be the same as the beam used for PRACH transmission under some other conditions, for example, the same as the SSB resources or CSI-RS resources used for PRACH transmission.

[0093] For example, according to some embodiments of the present application, the QCL property of the DMRS port of the PDSCH is determined based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured in the following cases:

[0094] a) Two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with the additional PCI, and the PRACH resources are associated with the additional PCI; or

[0095] b) two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with a CORESET pool index value different from the CORESET in which the PDCCH is received; or

[0096] c) L1 / L2 triggered mobility is configured in the serving cell and the PRACH resources are associated with additional PCI or candidate cells; or

[0097] d) Two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the additional PCI.

[0098] According to some embodiments of the present application, in response to the following, the DMRS port of the PDSCH will be determined to be QCL with the SSB resource or CSI-RS resource used to transmit the PRACH resource:

[0099] a) Two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with the additional PCI, and the PRACH resources are associated with the PCI of the serving cell; or

[0100] b) two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resources are associated with the CORESET pool index value of the CORESET in which the PDCCH is received; or

[0101] c) L1 / L2 triggered mobility is configured in the serving cell and the PRACH resources are associated with the PCI of the serving cell; or

[0102] d) two CORESET Pool Index values ​​are configured for the CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with the additional PCI, and an additional Type 1 CSS associated with the CORESET associated with the additional PCI is configured; or

[0103] e) Two CORESET pool indices or CORESETs are configured in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with the additional PCI, and only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the PCI of the serving cell.

[0104] Some exemplary situations are described below.

[0105] Situation 2-1

[0106] According to some embodiments of the present application, whether it is M-DCI-based M-TRP with TA enhancement or L1 / L2 triggered mobility, the beam of PDSCH will always be determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17" and the like.

[0107] First, assume that the UE is not configured with "dl-OrJoint-TCIStateList-r17" etc., and the beam of PDSCH is determined to be R15 / R16 specification.

[0108] According to some embodiments of the present application, in some exemplary scenarios of M-DCI-based M-TRP with TA enhancement, when the time offset between the PDCCH or DCI (e.g., DCI format 1_0 with CRC scrambled by RA-RNTI or MSGB-RNTI) scheduling the PDSCH and the reception of the PDSCH is equal to or greater than a threshold (e.g., a threshold based on reported UE capabilities (e.g., "timeDurationForQCL")), the beam of the PDSCH will be determined to be the same as the beam of the CORESET used for PDCCH transmission. This means that the UE can assume that the TCI state or QCL assumption of the PDSCH is the same as the TCI state or QCL assumption of the CORESET used for PDCCH transmission within the active BWP of the serving cell.

[0109] According to some other embodiments of the present application, in some exemplary scenarios of M-DCI-based M-TRP with TA enhancement, for example, the UE is configured by a higher layer parameter "PDCCH-Config" containing two different coresetPoolIndex values ​​in the "ControlResourceSets" of the BWP of the serving cell, when the offset between the reception of the PDCCH or DCI scheduling the PDSCH and the PDSCH is less than the threshold "timeDurationForQCL", at least one configured TCI state of the serving cell of the PDSCH contains a qcl-Type set to 'typeD', and the UE is configured with "enableDefaultTCI-StatePerCoresetPoolIndex", the beam of the PDSCH will be determined to be the same as the beam of the CORESET, which is associated with the monitored search space with the lowest CORESET identifier among the CORESETs configured with the same CORESETPoolIndex value of the PDCCH scheduling the PDSCH in the latest time slot, where one or more CORESETs associated with the same CORESETPoolIndex value are monitored by the UE. This means that the UE may assume that the DMRS port of the corresponding PDSCH associated with the coresetPoolIndex value of the serving cell is quasi-colocated with the RS with respect to the QCL parameters of the PDCCH quasi-colocation indication for the CORESET, wherein the CORESET is associated with the monitored search space with the lowest controlResourceSetId among the CORESETs configured with the same coresetPoolIndex value of the PDCCH scheduling the PDSCH in the latest time slot, where one or more CORESETs associated with the same coresetPoolIndex value of the PDCCH scheduling the PDSCH within the active BWP of the serving cell are monitored by the UE.

[0110] Secondly, assume that the UE is configured with "dl-OrJoint-TCIStateList-r17" etc., and the beam of PDSCH is determined to be R17 specification.

[0111] According to some embodiments of the present application, in some exemplary scenarios of M-DCI-based M-TRP with TA enhancement, for example, the UE is configured by a higher layer parameter "PDCCH-Config" containing two different coresetPoolIndex values ​​in the "ControlResourceSets" of the serving cell BWP, the beam of the PDSCH will be determined by the UE, for example, as the joint or downlink TCI state applicable in the time slot in which the PDSCH is transmitted, and is associated with the same CORESETPoolIndex value of the CORESET in which the PDCCH scheduling the PDSCH is received. In addition, the joint or downlink TCI state is indicated by the DCI or MAC CE applicable from the first time slot determined by the R17 specification. This means that the UE can assume that the DMRS port of the corresponding PDSCH of the serving cell is quasi-co-located with the RS in the joint or downlink TCI state, which is applicable in the time slot in which the PDSCH is transmitted, and the QCL type parameter given by the joint or downlink TCI state is associated with the same CORESETPoolIndex value of the CORESET in which the scheduling PDCCH is transmitted.

[0112] According to some other embodiments of the present application, in some exemplary scenarios of L1 / L2 triggered mobility, for example, the UE is configured with L1 / L2 triggered mobility, the beam of the PDSCH will be the joint or downlink TCI state applicable in the time slot in which the PDSCH is transmitted. This means that the UE can assume that the DMRS port of the corresponding PDSCH of the serving cell is quasi-co-located with the RS in the joint or DL ​​TCI state with respect to the QCL type parameter given by the joint or DL ​​TCI state.

[0113] Situation 2-2

[0114] In some embodiments of the present application, the beam of PDCCH is the same as the beam used for PRACH transmission under some conditions, for example, the same as the SSB resources or CSI-RS resources used for PRACH transmission; when these conditions are not met, the beam of PDSCH will be determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17" etc., as described in case 2-1.

[0115] For example, in some exemplary scenarios of inter-cell M-DCI based M-TRP with TA enhancement, e.g., the UE is configured by a higher layer parameter "PDCCH-Config" with two different coresetPoolIndex values ​​in the "ControlResourceSets" of the BWP containing the serving cell, and at least one activated joint or downlink TCI state is associated with an additional PCI, the beam of the PDDCH will be determined as follows.

[0116] In case the PRACH transmission is associated with the serving cell PCI, the beam of the PDSCH will be the same as the beam used for the PRACH transmission. This means that the UE can assume that the DMRS ports of the PDSCH are quasi-co-located with the SSB resources or CSI-RS resources used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable).

[0117] Otherwise, in the case where PRACH transmission is associated with additional PCI, the beam of PDSCH will be determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17" etc., as described in case 2-1.

[0118] In some exemplary scenarios of intra-cell M-DCI based M-TRP with TA enhancement, for example, the UE is configured by a higher layer parameter “PDCCH-Config” with two different coresetPoolIndex values ​​in “ControlResourceSets” of the BWP of the serving cell, the beam of the PDDCH will be determined as follows.

[0119] In case the PRACH transmission is associated with the same CORESETPoolIndex value of the CORESET in which the PDCCH is transmitted (or the CORESET is associated with a Type 1 PDCCH CSS), the beam for the PDSCH will be the same beam used for the PRACH transmission. This means that the UE may assume that the DMRS ports for the PDSCH are quasi-co-located with the SSB resources or CSI-RS resources that the UE uses for PRACH transmission (if applicable), and for transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable).

[0120] Otherwise, in the case where the PRACH transmission is associated with a CORESETPoolIndex value that is different from the CORESET in which the scheduled PDCCH is transmitted, that is, the PRACH transmission is not associated with the CORESETPoolIndex value of the CORESET in which the scheduled PDCCH is transmitted, the beam of the PDSCH will be determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17" or the like, as described in Case 2-1.

[0121] In some exemplary scenarios of L1 / L2 triggered mobility, for example, the UE is configured with L1 / L2 inter-cell mobility, the beam of PDDCH will be determined as follows.

[0122] In case the PRACH transmission is associated with the serving cell PCI, the beam of the PDSCH will be the same as the beam used for the PRACH transmission. This means that the UE can assume that the DMRS ports of the PDSCH will be quasi-co-located with the SSB resources or CSI-RS resources used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable).

[0123] Otherwise, in case the associated PRACH transmission is associated with an additional PCI or a candidate cell, the beam of the PDSCH shall be determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17", as described in case 2-1.

[0124] Situation 2-3

[0125] Similar to case 2-2, in some other embodiments of the present application, the beam of the PDCCH is the same as the beam used for PRACH transmission under some conditions, for example, the same as the SSB resource or CSI-RS resource used for PRACH transmission; and when these conditions are not met, the beam of the PDSCH will be determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17", etc. However, case 2-3 is only applicable to M-TRP based on inter-cell M-DCI.

[0126] For example, in some exemplary scenarios of M-TRP based on inter-cell M-DCI, for example, the UE is configured by a higher layer parameter "PDCCH-Config" with two different coresetPoolIndex values ​​in the "ControlResourceSets" of the BWP containing the serving cell, and at least one activated joint or downlink TCI state is associated with an additional PCI, the beam of the PDCCH will be determined as follows.

[0127] In case of configuring an additional Type 1 CSS associated with a CORESET associated with an additional PCI, the beam of the PDSCH shall be determined to be the same as the beam used for PRACH transmission. This means that the UE may assume that the DMRS ports of the PDSCH are quasi-co-located with the SSB resources or CSI-RS resources used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable).

[0128] Otherwise, in the case where only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured and the PRACH transmission is associated with the serving cell PCI, the beam of the PDSCH will be the same as the beam used for PRACH transmission. This means that the UE can assume that the DMRS port of the PDSCH is quasi-co-located with the SSB resources or CSI-RS resources used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable). In the case where only one Type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured and the PRACH transmission is associated with an additional PCI, the beam of the PDSCH will also be determined based on whether the UE is configured with "dl-OrJoint-TCIStateList-r17", etc., as described in case 2-1.

[0129] PDCCH ordered beam

[0130] According to some embodiments of the present application, the PDCCH command triggering the CRFA process of the SpCell is in DCI format 1_0 with a CRC scrambled by the C-RNTI.

[0131] Regarding the beam determination of the PDCCH command, in some embodiments of the present application, the beam of the PDCCH command is always the same as the beam of the CORESET in which the PDCCH command is transmitted (or received). In some other embodiments of the present application, the beam of the PDCCH command is the same as the beam of the CORESET in which the PDCCH command is transmitted (or received) under some conditions, and the same as the beam used for PRACH transmission in some other cases, for example, the same as the SSB resource or CSI-RS resource used for PRACH transmission.

[0132] For example, in some embodiments of the present application, the DMRS port of the PDCCH command is determined to be at least one RS QCL of the TCI state of the CORESET in which the PDCCH command is transmitted, in response to:

[0133] a) Two CORESET pool index values ​​are configured for the CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell; or

[0134] b) configure L1 / L2 triggered mobility in the serving cell; or

[0135] c) L1 / L2 triggered mobility is configured in the serving cell and PRACH resources are associated with additional PCI or candidate cells.

[0136] In some embodiments of the present application, in response to configuring L1 / L2 triggered mobility in a serving cell and the PRACH resources are associated with the PCI of the serving cell, the DMRS port of the PDCCH command is determined to be the SSB resource or CSI-RS resource QCL used to transmit the PRACH resources.

[0137] Some exemplary situations are described below.

[0138] Situation 3-1

[0139] According to some embodiments of the present application, whether it is M-TRP based on M-DCI with TA enhancement or L1 / L2 triggered mobility scenario, the beam of the PDCCH command is always determined to be the same as the beam of the CORESET in which the PDCCH command is transmitted (or received). This means that the UE can assume the DMRS antenna port of the quasi-co-location property of the PDCCH command of the CORESET in which the PDCCH command is transmitted (or received).

[0140] Situation 3-2

[0141] In some other embodiments of the present application, for example, L1 / L2 triggered mobility, the beam of the PDCCH command is the same as the beam of the CORESET in which the PDCCH is transmitted under some conditions, and the same as the beam used for PRACH transmission in some other cases, for example, the same as the SSB resources or CSI-RS resources used for PRACH transmission, depending on the different specific configurations of the UE.

[0142] For example, in some exemplary scenarios of L1 / L2 triggered mobility, for example, the UE is configured with L1 / L2 triggered mobility, the beam of the PDCCH command will be determined as follows. In the case where the PRACH transmission triggered by the PDCCH command is associated with the serving cell PCI, the beam of the PDCCH command will be the same as the beam used for the PRACH transmission. This means that the UE can assume that the DMRS port of the PDCCH command is quasi-co-located with the SSB resources or CSI-RS resources used by the UE for PRACH transmission (if applicable), and transmission of Doppler shift, Doppler spread, average delay, delay spread, spatial RX parameters (when applicable). Otherwise, in the case where the PRACH transmission triggered by the PDCCH command is associated with an additional PCI, the beam of the PDCCH command will be determined to be the same as the beam of the CORESET in which the PDCCH command is transmitted or received.

[0143] In addition to the method, an embodiment of the present application also proposes a beam determination device.

[0144] For example, Figure 4 A block diagram illustrating an apparatus 400 for beam determination according to some embodiments of the present application.

[0145] like Figure 4 As shown in FIG. 4 , the apparatus 400 may include at least one non-transitory computer-readable medium 401, at least one receiving circuit system 402, at least one transmitting circuit system 404, and at least one processor 406, which is coupled to the non-transitory computer-readable medium 401, the receiving circuit system 402, and the transmitting circuit system 404. The at least one processor 406 may be a central processing unit (CPU), a digital signaling processor (DSP), a microprocessor, etc. The apparatus 400 may be a RAN node (e.g., a gNB) configured to perform the method described in the above content, etc., or a remote device (e.g., a UE).

[0146] Although in this figure, elements such as at least one processor 406, transmit circuitry 404, and receive circuitry 402 are described in the singular, plural forms are contemplated unless limitation to the singular is explicitly stated. In some embodiments of the present application, receive circuitry 402 and transmit circuitry 404 may be combined into a single device, such as a transceiver. In certain embodiments of the present application, apparatus 400 may further include an input device, a memory, and / or other components.

[0147] In some embodiments of the present application, a non-transitory computer-readable medium 401 may have computer-executable instructions stored thereon to cause a processor to implement a method for a RAN node (e.g., a gNB as described above). For example, when executed, the computer-executable instructions cause the processor 406 to interact with the receiving circuit system 402 and the transmitting circuit system 404 to perform the steps for the RAN node as described above.

[0148] In some embodiments of the present application, the non-transitory computer-readable medium 401 may have computer-executable instructions stored thereon to cause the processor to implement a method for a remote device (e.g., a UE as described above). For example, when executed, the computer-executable instructions cause the processor 406 to interact with the receiving circuit system 402 and the transmitting circuit system 404 to perform the steps for the remote device as described above.

[0149] Figure 5 is a block diagram of a beam determination apparatus 500 according to some other embodiments of the present application.

[0150] refer to Figure 5 , the device 500 (e.g., a RAN node or a UE) may include at least one processor 502 and at least one transceiver 504 coupled to the at least one processor 502. The transceiver 504 may include at least one separate receive circuit system 506 and transmit circuit system 504, or at least one integrated receive circuit system 506 and transmit circuit system 504. The at least one processor 502 may be a CPU, a DSP, a microprocessor, etc.

[0151] According to some embodiments of the present application, device 500 is a RAN node (e.g., a gNB), comprising: a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: receive PRACH resources in a BWP of a serving cell; determine a QCL property of a DMRS port of a PDCCH in response to the PRACH resources based at least on whether multiple CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell and whether multiple TAGs are configured in the serving cell, or whether L1 / L2 triggered mobility is configured in the serving cell; and transmit a PDCCH based on the determined QCL property of the DMRS port of the PDCCH.

[0152] According to some embodiments of the present application, device 500 is a remote device (e.g., UE) comprising a transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: transmit PRACH resources in a BWP of a serving cell; determine a QCL property of a DMRS port of a PDCCH in response to the PRACH resources based at least on whether multiple CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell and whether multiple TAGs are configured in the serving cell, or whether L1 / L2 triggered mobility is configured in the serving cell; and receive a PDCCH based on the determined QCL property of the DMRS port of the PDCCH.

[0153] The method according to the embodiment of the present application can also be implemented on a programmed processor. However, the controller, flow chart and module can also be implemented on a general or special-purpose computer, a programmed microprocessor or microcontroller and peripheral integrated circuit elements, an integrated circuit, a hardware electronic or logic circuit (such as a discrete element circuit), a programmable logic device, etc. In general, any device capable of implementing the flow chart shown in the figure can be used to implement the processor function of the present application. For example, an embodiment of the present application provides a device including a processor and a memory. Computer programmable instructions for implementing the method are stored in a memory, and the processor is configured to execute the computer programmable instructions to implement the method. The method may be a method as stated above or other methods according to an embodiment of the present application.

[0154] Alternative embodiments preferably implement the method according to the embodiments of the present application in a non-transitory computer-readable storage medium storing computer programmable instructions. The instructions are preferably executed by a computer executable component that is preferably integrated with a network security system. The non-transitory computer-readable storage medium may be stored on any suitable computer-readable medium, such as a random access memory (RAM), a read-only memory (ROM), a flash memory, an electrically erasable programmable read-only memory (EEPROM), an optical storage device (a compact disk (CD) or a digital video disk (DVD)), a hard drive, a floppy disk drive, or any suitable device. The computer executable component is preferably a processor, but the instructions may be executed alternatively or additionally by any suitable dedicated hardware device. For example, an embodiment of the present application provides a non-transitory computer-readable storage medium having computer programmable instructions stored therein. The computer programmable instructions are configured to implement the method as stated above or other methods according to the embodiments of the present application.

[0155] In addition, in the present disclosure, the term "includes / including" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment comprising a series of elements not only includes those elements, but also may include other elements that are not explicitly listed or inherent to such processes, methods, articles or equipment. In the absence of more constraints, elements beginning with "a / an" etc. do not exclude the presence of additional identical elements in the process, method, article or equipment comprising the elements. In addition, the term "another" is defined as at least a second or more. As used herein, the term "having" etc. is defined as "comprising".

Claims

1. A wireless communication device, comprising: Transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: Transmitting physical random access channel PRACH resources in the bandwidth part BWP of the serving cell; determining a quasi-co-located QCL property of a demodulation reference signal DMRS port of a physical downlink control channel PDCCH in response to the PRACH resource at least based on whether a plurality of CORESET pool index values ​​are configured for a control resource set CORESET in the BWP of the serving cell and whether a plurality of timing advance groups TAG are configured in the serving cell, or whether layer 1 / layer 2 L1 / L2 triggered mobility is configured in the serving cell; and The PDCCH is received based on the determined QCL property of the DMRS port of the PDCCH.

2. The wireless communication device according to claim 1, wherein: Determining the QCL property of the DMRS port of the PDCCH includes: The DMRS port of the PDCCH and at least one reference signal RS QCL associated with a transmission configuration indicating a TCI state of a CORESET in which the PDCCH is received are determined in response to: configuring two CORESET pool index values ​​for a CORESET in the BWP of the serving cell, and configuring two TAGs in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell; or two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional physical cell identifier PCI, and the PRACH resource is associated with the additional PCI; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with an additional PCI or a candidate cell; or two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with a CORESET pool index value that is different from the CORESET pool index value of the CORESET in which the PDCCH is received; or Two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 common search space CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the additional PCI.

3. The wireless communication device according to claim 1, wherein: Determining the QCL property of the DMRS port of the PDCCH includes: The DMRS port of the PDCCH and a synchronization signal SS / physical broadcast channel PBCH block SSB resource or a channel state information CSI-reference signal RS resource QCL for transmitting the PRACH resource are determined in response to: two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink transmission configuration indicates that a TCI state is associated with an additional physical cell identifier PCI, and the PRACH resource is associated with the PCI of the serving cell; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with the PCI of the serving cell; or Two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with the CORESET pool index value of the CORESET in which the PDCCH is received; or configuring two CORESET pool index values ​​in different CORESETs for a CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, at least one activated joint or downlink TCI state being associated with an additional PCI, and configuring an additional type 1 common search space CSS associated with the CORESET associated with the additional PCI; or Two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the PCI of the serving cell.

4. The wireless communication device according to claim 1, wherein: The processor is further configured to determine a QCL property of a DMRS port of a physical downlink shared channel (PDSCH) scheduled by the PDCCH, comprising: The QCL property of the DMRS port of the PDSCH is determined based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured, wherein: When the parameter "dl-OrJoint-TCIStateList-r17" is not configured, two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, the DMRS port of the PDSCH is determined to be associated with the following QCL: at least one reference signal RS associated with a transmission configuration indicating a TCI state of a CORESET in which the PDCCH is received in response to a time offset between reception of the PDCCH and the PDSCH being greater than or equal to a threshold; or at least one RS associated with a TCI state of a CORESET, the CORESET being associated with a monitored search space having a lowest CORESET identity among the CORESETs configured with the same CORESET pool index value of the PDCCH in a latest time slot, wherein in response to the time offset between reception of the PDCCH and the PDSCH being less than the threshold, one or more CORESETs associated with the same CORESET pool index value are monitored, at least one configured TCI state of the serving cell of the PDSCH having a parameter "qcl-Type" set to 'typeD' and a configuration parameter "enableDefaultTCI-StatePerCoresetPoolIndex"; or When the parameter "dl-OrJoint-TCIStateList-r17" is configured, two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, the DMRS port of the PDSCH is determined to be associated with the following QCL: at least one RS associated with a joint or downlink TCI state applicable in the timeslot in which the PDSCH is received and associated with the same CORESET pool index of the CORESET in which the PDCCH is received; or When the parameter "dl-OrJoint-TCIStateList-r17" is configured and L1 / L2 triggered mobility is configured in the serving cell, the DMRS port of the PDSCH and the following QCL are determined: At least one RS associated with a joint or downlink TCI state applicable in a timeslot in which the PDSCH is received.

5. The wireless communication device according to claim 4, wherein: The processor is configured to determine the QCL property of the DMRS port of the PDSCH based on whether the parameter “dl-OrJoint-TCIStateList-r17” is configured in the following cases: configuring two CORESET pool index values ​​for a CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, at least one activated joint or downlink TCI state being associated with an additional physical cell identifier PCI, and the PRACH resource being associated with the additional PCI; or Two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with a CORESET pool index value different from a CORESET in which the PDCCH is received; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with an additional PCI or a candidate cell; or Two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 common search space CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the additional PCI.

6. The wireless communication device according to claim 1, wherein: The processor is further configured to determine a QCL property of a DMRS port of a physical downlink shared channel (PDSCH) scheduled by the PDCCH, comprising: The DMRS port of the PDSCH and a synchronization signal SS / physical broadcast channel PBCH block SSB resource or a channel state information CSI-reference signal RS resource QCL for transmitting the PRACH resource are determined in response to: two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink transmission configuration indicates that a TCI state is associated with an additional cell identifier PCI, and the PRACH resource is associated with the PCI of the serving cell; or Two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with the CORESET pool index value of the CORESET in which the PDCCH is received; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with a PCI of the serving cell; or configuring two CORESET pool index values ​​for a CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, at least one activated joint or downlink TCI state being associated with an additional PCI, and configuring an additional type 1 common search space CSS associated with the CORESET associated with the additional PCI; or Two CORESET pool indexes are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the PCI of the serving cell.

7. The wireless communication device according to claim 1, wherein: The transmission of the PRACH resource is initiated by a PDCCH command, and the processor is further configured to determine a QCL property of a DMRS port of the PDCCH command, which includes: In response to configuring two CORESET pool index values ​​for CORESET in the BWP of the serving cell and configuring two TAGs in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell, and the PRACH resource is associated with an additional physical cell identifier PCI or a candidate cell, determining the DMRS port of the PDCCH command and the transmission of the CORESET in which the PDCCH command is transmitted, wherein the transmission configuration indicates at least one reference signal RS QCL of the TCI state; or In response to configuring L1 / L2 triggered mobility in the serving cell and the PRACH resource being associated with the PCI of the serving cell, the DMRS port of the PDCCH command and the synchronization signal SS / physical broadcast channel PBCH block SSB resource or channel state information CSI-RS resource QCL used to transmit the PRACH resource are determined.

8. A wireless communication device, comprising: Transceiver; and a processor coupled to the transceiver, wherein the processor is configured to: Receiving a physical random access channel PRACH resource in a bandwidth part BWP of a serving cell; determining a quasi-co-located QCL property of a demodulation reference signal DMRS port of a physical downlink control channel PDCCH in response to the PRACH resource at least based on whether a plurality of CORESET pool index values ​​are configured for a control resource set CORESET in the BWP of the serving cell and whether a plurality of timing advance groups TAG are configured in the serving cell, or whether layer 1 / layer 2 L1 / L2 triggered mobility is configured in the serving cell; and The PDCCH is transmitted based on the determined QCL property of a DMRS port of the PDCCH.

9. The wireless communication device according to claim 8, wherein: Determining the QCL property of the DMRS port of the PDCCH includes: The DMRS port of the PDCCH and at least one reference signal RS QCL associated with a transmission configuration indicating a TCI state of a CORESET in which the PDCCH is transmitted are determined in response to: configuring two CORESET pool index values ​​for a CORESET in the BWP of the serving cell, and configuring two TAGs in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell; or two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional physical cell identifier PCI, and the PRACH resource is associated with the additional PCI; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with an additional PCI or a candidate cell; or Two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with a CORESET pool index value that is different from the CORESET pool index value of the CORESET in which the PDCCH is transmitted; or Two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 common search space CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the additional PCI.

10. The wireless communication device according to claim 8, wherein: Determining the QCL property of the DMRS port of the PDCCH includes: The DMRS port of the PDCCH and a synchronization signal SS / physical broadcast channel PBCH block SSB resource or a channel state information CSI-reference signal RS resource QCL for receiving the PRACH resource are determined in response to: two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink transmission configuration indicates that a TCI state is associated with an additional physical cell identifier PCI, and the PRACH resource is associated with the PCI of the serving cell; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with the PCI of the serving cell; or Two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with the CORESET pool index value of the CORESET in which the PDCCH is transmitted; or configuring two CORESET pool index values ​​in different CORESETs for a CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, at least one activated joint or downlink TCI state being associated with an additional PCI, and configuring an additional type 1 common search space CSS associated with the CORESET associated with the additional PCI; or Two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 common search space CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the PCI of the serving cell.

11. The wireless communication device according to claim 8, wherein: The processor is further configured to determine a QCL property of a DMRS port of a physical downlink shared channel (PDSCH) scheduled by the PDCCH, comprising: The QCL property of the DMRS port of the PDSCH is determined based on whether the parameter "dl-OrJoint-TCIStateList-r17" is configured, wherein: When the parameter "dl-OrJoint-TCIStateList-r17" is not configured, two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, the DMRS port of the PDSCH is determined to be associated with the following QCL: at least one reference signal RS associated with a transmission configuration indicating a TCI state of a CORESET in which the PDCCH is transmitted in response to a time offset between transmissions of the PDCCH and the PDSCH being greater than or equal to a threshold; or at least one RS associated with a TCI state of a CORESET, the CORESET being associated with a monitored search space having a lowest CORESET identity among the CORESETs configured with the same CORESET pool index value of the PDCCH in a latest time slot, wherein in response to the time offset between the transmission of the PDCCH and the PDSCH being less than the threshold, one or more CORESETs associated with the same CORESET pool index value are monitored, at least one configured TCI state of the serving cell of the PDSCH having a parameter "qcl-Type" set to 'typeD' and a configuration parameter "enableDefaultTCI-StatePerCoresetPoolIndex"; or When the parameter "dl-OrJoint-TCIStateList-r17" is configured, two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, and two TAGs are configured in the serving cell, the DMRS port of the PDSCH is determined to be associated with the following QCL: at least one RS associated with a joint or downlink TCI state applicable in the timeslot in which the PDSCH is transmitted and associated with the same CORESET pool index of the CORESET in which the PDCCH is transmitted; or When the parameter "dl-OrJoint-TCIStateList-r17" is configured and L1 / L2 triggered mobility is configured in the serving cell, the DMRS port of the PDSCH and the following QCL are determined: At least one RS associated with a joint or downlink TCI state applicable in a timeslot in which the PDSCH is transmitted.

12. The wireless communication device according to claim 11, wherein: The processor is configured to determine the QCL property of the DMRS port of the PDSCH based on whether the parameter “dl-OrJoint-TCIStateList-r17” is configured in the following cases: configuring two CORESET pool index values ​​for a CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, at least one activated joint or downlink TCI state being associated with an additional physical cell identifier PCI, and the PRACH resource being associated with the additional PCI; or Two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with a CORESET pool index value different from a CORESET in which the PDCCH is transmitted; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with an additional PCI or a candidate cell; or Two CORESET pool index values ​​are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 common search space CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resource is associated with the additional PCI.

13. The wireless communication device according to claim 8, wherein: The processor is further configured to determine a QCL property of a DMRS port of a physical downlink shared channel (PDSCH) scheduled by the PDCCH, comprising: The DMRS port of the PDSCH and a synchronization signal SS / physical broadcast channel PBCH block SSB resource or a channel state information CSI-reference signal RS resource QCL for receiving the PRACH resource are determined in response to: two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink transmission configuration indicates that a TCI state is associated with an additional physical cell identifier PCI, and the PRACH resource is associated with the PCI of the serving cell; or Two CORESET pool index values ​​are configured for a CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, and the PRACH resource is associated with the CORESET pool index value of the CORESET in which the PDCCH is transmitted; or L1 / L2 triggered mobility is configured in the serving cell, and the PRACH resource is associated with a PCI of the serving cell; or configuring two CORESET pool index values ​​for a CORESET in the BWP of the serving cell, configuring two TAGs in the serving cell, at least one activated joint or downlink TCI state being associated with an additional PCI, and configuring an additional type 1 common search space CSS associated with the CORESET associated with the additional PCI; or Two CORESET pool indexes are configured for CORESET in the BWP of the serving cell, two TAGs are configured in the serving cell, at least one activated joint or downlink TCI state is associated with an additional PCI, only one type 1 CSS associated with the CORESET associated with the PCI of the serving cell is configured, and the PRACH resources are associated with the PCI of the serving cell.

14. The wireless communication device according to claim 8, wherein: The transmission of the PRACH resource is initiated by a PDCCH command, and the processor is further configured to determine a QCL property of a DMRS port of the PDCCH command, which includes: In response to configuring two CORESET pool index values ​​for CORESET in the BWP of the serving cell and configuring two TAGs in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell; or configuring L1 / L2 triggered mobility in the serving cell, and the PRACH resource is associated with an additional physical cell identifier PCI or a candidate cell, determining the DMRS port of the PDCCH command and the transmission of the CORESET in which the PDCCH command is transmitted, wherein the transmission configuration indicates at least one reference signal RS QCL of the TCI state; or In response to configuring L1 / L2 triggered mobility in the serving cell and the PRACH resource being associated with the PCI of the serving cell, the DMRS port of the PDCCH command is determined to be associated with a synchronization signal SS / physical broadcast channel PBCH block SSB resource or a channel state information CSI-RS resource QCL for receiving the PRACH resource.

15. A wireless communication method, comprising: Receiving a physical random access channel PRACH resource in a bandwidth part BWP of a serving cell; determining a quasi-co-located QCL property of a demodulation reference signal DMRS port of a physical downlink control channel PDCCH in response to the PRACH resource at least based on whether a plurality of CORESET pool index values ​​are configured for a control resource set CORESET in the BWP of the serving cell and whether a plurality of timing advance groups TAG are configured in the serving cell, or whether layer 1 / layer 2 L1 / L2 triggered mobility is configured in the serving cell; and The PDCCH is transmitted based on the determined QCL property of a DMRS port of the PDCCH.

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