MAC CE for configuring path loss reference signal for SRS

Abstract

A method and apparatus for configuring a path loss reference signal to an SRS resource set are disclosed. A method includes: configuring a path loss reference signal for one or more SRS resource sets by using a MAC CE, and sending a PDSCH carrying the MAC CE.

Description

Technical Field

[0001] The subject matter disclosed herein relates generally to wireless communications, and more particularly to configuring a path loss reference signal for SRS. Background Art

[0002] The following abbreviations are defined herein, at least some of which are referred to within the following description: 3rd Generation Partnership Project (3GPP), European Telecommunications Standards Institute (ETSI), Frequency Division Duplex (FDD), Frequency Division Multiple Access (FDMA), Long Term Evolution (LTE), New Radio (NR), Very Large Scale Integration (VLSI), Random Access Memory (RAM), Read Only Memory (ROM), Erasable Programmable Read Only Memory (EPROM or Flash Memory), Compact Disc Read Only Memory (CD-ROM), Local Area Network (LAN), Wide Area Network (WAN), Personal Digital Assistant (PDA), User Equipment (UE), Uplink (UL), Evolved Node B (eNB), Next Generation Node B (gNB), New Radio (NR), Downlink (DL), Central Processing Unit (CPU), Graphics Processing Unit (GPU), Field Programmable Gate Array (FPGA), Dynamic RAM (DRAM), Synchronous Dynamic RAM (SDRAM), Static RAM (SRAM), Liquid Crystal Display (LCD), Light Emitting Diode (LED), Organic LED (OLED), Next Generation Node B (gNB), Orthogonal Frequency Division Multiplexing (OFDM), Radio Resource Control (RRC), Reference Signal (RS), Time Division Duplex (TDD), Time Division Multiplexing (TDM), User Entity / Equipment (Mobile Terminal) (UE), Uplink (UL), Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE), Narrowband (NB), Physical Downlink Shared Channel (PDSCH), Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH), Downlink Control Information (DCI), Universal Mobile Telecommunications System (UMTS), Evolved UMTS Terrestrial Radio Access (E-UTRA or EUTRA), Medium Access Control (MAC), Control Element (CE), Bandwidth Part (BWP), Technical Specification (TS), Path Loss Reference Signal (PL-RS), Sounding Reference Signal (SRS), Synchronization Signal Block (SSB), Non-Zero Power (NZP), Channel State Information (CSI), Reference Signal (RS), Semi-Persistent SRS (SP SRS), Aperiodic SRS (AP SRS), Component Carrier (CC).

[0003] In NR Release 15, the path loss reference signal (PL-RS) of SRS is configured through RRC signaling per SRS resource set. All SRS resources included in an SRS resource set share the same PL-RS to determine the transmit power for SRS transmission.

[0004] For UL beam management latency and overhead reduction, configuring PL-RS through RRC signaling is not desirable because RRC signaling consumes about 100ms. During this period, the required path loss reference signal may change, and the configured path loss reference signal may not be appropriate. Therefore, a new and more efficient mechanism is needed to quickly indicate (or update) PL-RS.

[0005] Therefore, an object of the present invention is to provide a method and an apparatus to implement the indication (or update) of a path loss reference signal for SRS. Summary of the invention

[0006] A method and apparatus for configuring a path loss reference signal to an SRS resource set are disclosed.

[0007] In one embodiment, a method includes configuring a path loss reference signal for one or more SRS resource sets by using a MAC CE and transmitting a PDSCH carrying the MAC CE.

[0008] In one embodiment, the MAC CE includes one or more SRS resource set IDs, each of which indicates the SRS resource set to which the MAC CE applies. The MAC CE may further include one or more SRS path loss reference signal IDs, each of which indicates a path loss reference signal configured for the SRS resource set indicated by the SRS resource set ID in the MAC CE.

[0009] In another embodiment, the MAC CE includes a single SRS resource set ID and S i bitmap, with 1 bit for each S i Indicates the activation status of the configured SRS path loss reference signal, and only activates a single SRS resource set indicated by a single SRS resource set ID. i In some embodiments, the MAC CE includes t i bitmap, with 1 bit for each t i Indicates the SRS resource set ID, each t i Indicates whether the MAC CE applies to the SRS resource set with SRS resource set ID equal to i.

[0010] In some embodiments, the MAC CE includes a PL-RS ID, which is an ssb-Index indicating an SS / PBCH block or a csi-RS-Index indicating an NZP CSI-RS resource, wherein the SS / PBCH block or the NZP CSI-RS resource is used as a path loss reference signal for an SRS resource set configuration indicated by an SRS resource set ID. The MAC CE may further include a one-bit field to indicate whether the PL-RS ID is an ssb-Index or a csi-RS-Index.

[0011] In some embodiments, the MAC CE includes a serving cell ID, and when the serving cell ID is in the simultaneousSpatialRelationCellList, for all BWPs in the cells in the simultaneousSpatialRelationCellList including the serving cell ID, a path loss reference signal is configured for all SRS resource sets having the same SRS resource set ID.

[0012] In one embodiment, the base station unit includes a processor for configuring a path loss reference signal for one or more SRS resource sets by using a MAC CE; and a transmitter for transmitting a PDSCH carrying the MAC CE.

[0013] In another embodiment, a method includes receiving a PDSCH carrying a MAC CE, wherein the MAC CE is used to configure a path loss reference signal for one or more SRS resource sets.

[0014] In yet another embodiment, the remote unit includes a receiver for receiving a PDSCH carrying a MAC CE, wherein the MAC CE is used to configure a path loss reference signal for one or more SRS resource sets. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] A more particular description of the embodiments briefly described above will be presented by reference to specific embodiments that are illustrated in the accompanying drawings. Understanding that these drawings depict only some embodiments and are therefore not to be considered limiting of scope, the embodiments will be described and explained with additional specificity and detail through the use of the accompanying drawings, in which:

[0016] Figure 1 FIG. 1 illustrates an example of an SRS path loss reference signal indicating a MAC CE according to the first embodiment;

[0017] Figure 2 FIG. 1 illustrates an example of an SRS path loss reference signal indicating a MAC CE according to the second embodiment;

[0018] Figure 3FIG. 4 illustrates an example of an SRS path loss reference signal indicating a MAC CE according to a third embodiment;

[0019] Figure 4 FIG. 4 illustrates an example of an SRS path loss reference signal indicating a MAC CE according to a fourth embodiment;

[0020] Figure 5 FIG. 4 illustrates an example of an SRS path loss reference signal indicating a MAC CE according to a sixth embodiment;

[0021] Figure 6 is a schematic flow chart illustrating an embodiment of a method for configuring a path loss reference signal for an SRS;

[0022] Figure 7 is a schematic flow chart illustrating yet another embodiment of a method for configuring a path loss reference signal for an SRS; and

[0023] Figure 8 is a schematic block diagram illustrating an apparatus according to one embodiment. DETAILED DESCRIPTION

[0024] As will be appreciated by those skilled in the art, certain aspects of the embodiments may be embodied as systems, devices, methods or program products. Thus, the embodiments may take the form of a complete hardware embodiment, a complete software embodiment (including firmware, resident software, microcode, etc.), or a combination of software and hardware aspects, which may be generally referred to herein as a "circuit," "module," or "system." In addition, the embodiments may take the form of a program product embodied in one or more computer-readable storage devices, which store machine-readable code, computer-readable code, and / or program code, hereinafter referred to as "code." The storage device may be tangible, non-transitory, and / or non-transmitting. The storage device may not embody a signal. In a certain embodiment, the storage device employs only a signal for accessing the code.

[0025] Some functional units described in this specification may be labeled as "modules" to more particularly emphasize their independent implementation. For example, a module may be implemented as a hardware circuit including custom very large scale integration (VLSI) circuits or gate arrays, off-the-shelf semiconductors such as logic chips, transistors, or other discrete components. A module may also be implemented in a programmable hardware device such as a field programmable gate array, programmable array logic, a programmable logic device, etc.

[0026] Modules may also be implemented in code and / or software for execution by various types of processors. An identification module of code may, for example, include one or more physical or logical blocks of executable code, which may, for example, be organized as objects, procedures, or functions. However, the executable files identifying the modules need not be physically located together, but may include different instructions stored in different locations, which, when logically joined together, comprise the module and achieve the stated purpose of the module.

[0027] In fact, the module of code can contain a single instruction or many instructions, and can even be distributed on several different code segments, in different programs and across several memory devices. Similarly, operating data can be identified and illustrated in this article in the module and can be embodied in any suitable form and organized in the data structure of any suitable type. This operating data can be collected as a single data set, or can be distributed on different locations, including on different computer-readable storage devices. When the module or the parts of the module are implemented in software, the software part is stored on one or more computer-readable storage devices.

[0028] Any combination of one or more computer readable media may be utilized. The computer readable medium may be a computer readable storage medium. The computer readable storage medium may be a storage device storing code. The storage device may be, for example, but not necessarily, an electronic, magnetic, optical, electromagnetic, infrared, holographic, micromechanical, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing.

[0029] A non-exhaustive list of more specific examples of storage devices would include the following: an electrical connection having one or more wires, a portable computer floppy disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer-readable storage medium may be any tangible medium that can contain or store a program for use by or in connection with an instruction execution system, apparatus, or device.

[0030] The code for performing the operations of the embodiments may include any number of lines and may be written in any combination of one or more programming languages ​​including object-oriented programming languages ​​such as Python, Ruby, Java, Smalltalk, C++, etc., conventional procedural programming languages ​​such as the "C" programming language, and / or machine languages ​​such as assembly languages. The code may be executed entirely on the user's computer, partially on the user's computer, as a stand-alone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the last scenario, the remote computer may be connected to the user's computer through any type of network including a local area network (LAN) or a wide area network (WAN), or a connection may be made to an external computer (e.g., over the Internet using an Internet service provider).

[0031] References to "one embodiment", "embodiment" or similar language throughout the specification mean that the specific features, structures or characteristics described together with the embodiment are included in at least one embodiment. Therefore, unless otherwise explicitly specified, the phrases "in one embodiment", "in an embodiment" and similar language throughout the specification may, but not necessarily, refer to the same embodiment, but mean "one or more but not all embodiments". Unless otherwise explicitly specified, the terms "including", "comprising", "having" and their variations mean "including but not limited to". Unless explicitly specified, an enumerated list of items does not imply that any or all of the items are mutually exclusive. Unless otherwise explicitly specified, the terms "one", "an" and "the" also mean "one or more".

[0032] In addition, the features, structures or characteristics of the descriptions of the various embodiments may be combined in any suitable manner. In the following description, many specific details are provided, such as examples of programming, software modules, user selections, network transactions, database queries, database structures, hardware modules, hardware circuits, hardware chips, etc., to provide a thorough understanding of the embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of the specific details or using other methods, components, materials, etc. In other cases, well-known structures, materials or operations are not shown or described in detail to avoid confusing aspects of the embodiments.

[0033] Various aspects of different embodiments are described below with reference to schematic flow charts and / or schematic block diagrams of methods, devices, systems, and program products according to embodiments. It will be understood that each frame of the schematic flow chart and / or schematic block diagram and the combination of frames in the schematic flow chart and / or schematic block diagram can be implemented by code. The code can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, so that instructions executed by a processor of a computer or other programmable data processing device create a device for implementing the functions specified for a frame or frames in the schematic flow chart and / or schematic block diagram.

[0034] The code may also be stored in a storage device that is capable of directing a computer, other programmable data processing apparatus, or other device to function in a specific manner so that the instructions stored in the storage device produce an article of manufacture including instructions for implementing the functions specified in the blocks or some blocks of the flowchart and / or block diagram.

[0035] The code may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus, or other device to produce a computer-implemented process, so that the code executed on the computer or other programmable apparatus provides a process for implementing the functions specified in a box or some boxes of the flowchart and / or block diagram.

[0036] The schematic flow charts and / or schematic block diagrams in the figures illustrate the architecture, functions and operations of possible implementations of the apparatus, system, method and program product according to various embodiments. In this regard, each box in the schematic flow charts and / or schematic block diagrams may represent a module, segment or portion of code, which includes one or more executable instructions of the code for implementing the specified logical function.

[0037] It should also be noted that in some alternative implementations, the functions annotated in the blocks may not occur in the order indicated in the various figures. For example, two blocks shown in succession may be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order, depending on the functions involved. Other steps and methods may be envisioned that are equivalent in function, logic, or effect to one or more blocks or portions thereof of the illustrated figures.

[0038] Although various arrow types and line types can be adopted in flow charts and / or block diagrams, they are understood to not limit the scope of the corresponding embodiments. In fact, some arrows or other connectors can be used to indicate the logical flow of only the depicted embodiments. For example, an arrow can indicate a waiting or monitoring period of unspecified duration between the enumeration steps of the depicted embodiments. It will also be noted that each frame of the block diagram and / or flow chart and the combination of frames in the block diagram and / or flow chart can be realized by a combination of a dedicated hardware-based system or dedicated hardware and code that performs a specified function or behavior.

[0039] Descriptions of elements in various figures may refer to elements of previous figures. The same reference numerals refer to the same elements in all figures, including alternative embodiments of the same elements.

[0040] MAC CE can perform configuration faster than RRC signaling. Therefore, the present invention proposes to configure PL-RS for SRS by using MAC CE, and send the PDSCH carrying MAC CE from the base station unit (e.g., gNB) to the remote unit (e.g., UE).

[0041] The PL-RS for SRS is configured according to the SRS resource set. That is, all SRS resources contained in an SRS resource set use the same PL-RS for SRS power control to determine the transmit power for SRS transmission. When the PL-RS is configured for the SRS resource set for the first time (that is, the SRS resource set has not been previously configured with a PL-RS for SRS), it can be said that the PL-RS for SRS is indicated to the SRS resource set. When a new PL-RS for SRS is configured for the SRS resource set (that is, the SRS resource set was previously configured with a PL-RS for SRS), it can be said that the PL-RS for SRS is updated to the SRS resource set. Up to 64 path loss reference signals for SRS, i.e., SRS-PathlossReferenceRS, can be configured for UEs in the BWP according to the capabilities of the UE through RRC signaling, and one of them can be selected and configured for the SRS resource set at a time.

[0042] An example of the SRS path loss reference signal indicating the MAC CE according to the first embodiment is as follows: Figure 1 The MAC CE according to the first embodiment is used to indicate or update an SRS path loss reference signal (SRS-PathlossReferenceRS) to an SRS resource set. It includes the following fields:

[0043] (1) Serving Cell ID: This field indicates the identity of the serving cell used by the MAC CE. The length of the Serving Cell ID field is 5 bits.

[0044] (2) BWP ID: This field indicates the UL BWP that the MAC CE applies to as the code point of the DCI bandwidth part indicator field. The length of the BWP ID field is 2 bits.

[0045] (3) SRS Resource Set ID: This field indicates the SRS resource set applied by the MAC CE. The length of the SRS Resource Set ID field is 4 bits, because a maximum of 16 SRS resource sets can be configured for the UE in the BWP according to the UE's capabilities.

[0046] (4) SRS-PathlossReferenceRS-ID: This field indicates the SRS path loss reference signal (SRS-PathlossReferenceRS) configured for the SRS resource set indicated by the SRS Resource Set ID field. The length of the SRS-PathlossReferenceRS-ID is 6 bits because up to 64 SRS-PathlossReferenceRS can be configured for the UE in the BWP depending on the UE's capabilities.

[0047] (5) R: Reserved bit. Each reserved bit can be set to "0".

[0048] According to the first embodiment, the SRS path loss reference signal indication MAC CE has a fixed size of 24 bits.The SRS path loss reference signal indication MAC CE according to the first embodiment can indicate (or update) the SRS path loss reference signal to one SRS resource set.

[0049] Figure 2 The figure shows an example of an SRS path loss reference signal indicating MAC CE according to the second embodiment. The MAC CE according to the second embodiment is used to indicate an SRS path loss reference signal (SRS-PathlossReferenceRS) to an SRS resource set. It includes the following fields:

[0050] (1) Serving Cell ID: This field indicates the identity of the serving cell to which the MAC CE applies. The length of the Serving Cell ID field is 5 bits.

[0051] (2) BWP ID: This field indicates the UL BWP to which the MAC CE applies as the code point of the DCI bandwidth part indicator field. The length of the BWP ID field is 2 bits.

[0052] (3) SRS Resource Set ID: This field indicates the SRS resource set to which the MAC CE applies. The length of the SRS Resource Set ID field is 4 bits because up to 16 SRS resource sets can be configured for the UE in the BWP according to the UE's capabilities.

[0053] The above-mentioned fields (1) to (3) according to the second embodiment are the same as the fields (1) to (3) according to the first embodiment.

[0054] (4)S i :Each configured SRS-PathlossReferenceRS consists of a single bit S i For the SRS-PathlossReferenceRS with SRS-PathlossReferenceRS-Id configured with index i for the UL BWP indicated by the BWPID field, S i The SRS-PathlossReferenceRS field is set to 1 (or 0) to indicate that the SRS-PathlossReferenceRS is activated (or deactivated) as the path loss reference signal for the SRS resource set indicated by the SRS resource set ID field. Obviously, for an SRS resource set, only a single SRS-PathlossReferenceRS (i.e., only one SRS) is used at a time. i ) may be activated. Because there are up to 64 SRS-PathlossReferenceRS that can be configured for the UE in the BWP according to the UE's capabilities, there may be up to 64 SRS-PathlossReferenceRS in the SRS path loss reference signal indication MAC CE according to the second embodiment. i By the way, if the configured SRS-PathlossReferenceRS is less than 64, this field contains the S i The number of S can also be less than 64. That is, the S contained in this field i The number of PathlossReferenceRS is equal to the number of configured PathlossReferenceRS, up to 64.

[0055] (5) R: Reserved bit. Each reserved bit can be set to "0".

[0056] like Figure 2As shown in , when the number of PathlossReferenceRS configured for the UE in the BWP is 64, N is equal to 9. That is, under this condition, the SRS path loss reference signal indication MAC CE according to the second embodiment has a size of 80 (=8*(9+1)) bits. The size of the SRS path loss reference signal indication MAC CE according to the second embodiment depends on the number of PathlossReferenceRS configured for the UE in the BWP. The size can range from 24 to 80 and is an integer that is a multiple of 8.

[0057] According to the first and second embodiments, for a UE in a BWP, only one PathlossReferenceRS can be indicated (or updated) to one SRS resource set. According to the third embodiment, one SRS path loss reference signal indicates that the MAC CE can be applied to more than one SRS resource set. That is, one MAC CE can indicate (or update) an SRS path loss reference signal (SRS-PathlossReferenceRS) to each of multiple SRS resource sets.

[0058] Figure 3 FIG. 1 shows an example of an SRS path loss reference signal indicating a MAC CE according to the third embodiment. i The SRS-PathlossReferenceRS-ID field indicates the ith SRS resource set ID to which the MAC CE applies. i The field indicates the configuration for the SRS Resource Set ID i The SRS path loss reference signal (SRS-PathlossReferenceRS) of the SRS resource set indicated by the field (with the same i SRS Resource Set ID of index i with the same field i field). The index i may range from 0 to 15 (ie, N-1) because a maximum of 16 (ie, N) SRS resource sets may be applied for the UEs in the BWP according to the capabilities of the UEs.

[0059] Specifically, the SRS path loss reference signal indication MAC CE according to the third embodiment includes the following fields:

[0060] (1) Serving Cell ID: This field indicates the identity of the serving cell to which the MAC CE applies. The length of the Serving Cell ID field is 5 bits.

[0061] (2) BWP ID: This field indicates the UL BWP that the MAC CE applies to as the code point of the DCI bandwidth part indicator field. The length of the BWP ID field is 2 bits.

[0062] The above-mentioned fields (1)-(2) according to the third embodiment are the same as the fields (1)-(2) according to the first embodiment.

[0063] (3)SRS Resource Set ID i : Each SRS Resource Set ID i Indicates the SRS resource set to which the MAC CE applies. Each SRS Resource Set ID i The length of is 4 bits, because up to 16 SRS resource sets can be configured for UEs in the BWP according to the UE's capabilities. According to the third embodiment, there may be up to 16 SRS resource set IDs in the SRS path loss reference signal indication MAC CE. i According to the third embodiment, the SRS Resource Set ID included in the MAC CE i The number can be determined by the corresponding sub-header of this MAC CE.

[0064] (4)SRS-PathlossReferenceRS-ID i : Each SRS-PathlossReferenceRS-ID i Indicates the resource set ID that applies to i The SRS resource set indicated by the field has a path loss reference signal. Each SRS-PathlossReferenceRS-ID i The length of is 6 bits, because up to 64 SRS-PathlossReferenceRS can be configured for the UE in the BWP according to the capability of the UE. i The number and SRS Resource Set ID i The same number of.

[0065] (5) R: Reserved bit. Each reserved bit can be set to "0".

[0066] The SRS path loss reference signal indication MAC CE according to the third embodiment has a variable size. In particular, the MAC CE according to the third embodiment has a size of 8+16*N bits, where N is the number of SRS resource sets to each of which an SRS path loss reference signal (SRS-PathlossReferenceRS) is indicated (or updated), and N ranges from 1 to 16. If N=1, the MAC CE according to the third embodiment has the same structure as that according to the first embodiment.

[0067] Figure 4 FIG. 4 shows an example of an SRS path loss reference signal indicating a MAC CE according to the fourth embodiment. Figure 4 As shown in , all SRS resource set IDs are represented using a bitmap in the MAC CE, where each SRS resource set ID is represented by a single bit, i.e., t i (t0 to t 15 ). Each t i The field indicates whether this MAC CE applies to the SRS resource set with SRS-ResourceSetId equal to i. i This field is set to 1 to indicate that the PL-RS of the SRS resource set with SRS-ResourceSetId equal to i is to be indicated or updated. SRS-PathlossReferenceRS-ID i is an SRS-PathlossReferenceRS-ID indicating an SRS path loss reference signal for the i-th SRS resource set, wherein t i The field is set to 1. i The field is set to 0 to indicate that the PL-RS of the SRS resource with SRS-ResourceSetId equal to i will not be updated. In other words, when t i = 1, including SRS-PathlossReferenceRS-ID i field to indicate the i The indicated SRS resource set indicates or updates the SRS path loss reference signal. On the other hand, when t i = 0, does not include SRS-PathlossReferenceRS-ID i field.

[0068] like Figure 4As shown in , the SRS-PathlossReferenceRS-ID0 field and the SRS-PathlossReferenceRS-ID2 field are included in the example of the SRS path loss reference signal indication MAC CE according to the fourth embodiment. Therefore, t0 and t2 are both equal to 1. On the other hand, the SRS-PathlossReferenceRS-ID1 field is not included in the example of the SRS path loss reference signal indication MAC CE according to the fourth embodiment. Therefore, t1 is equal to 0. That is, when the SRS-PathlossReferenceRS-ID i When the field is i is equal to 0.

[0069] If included, SRS-PathlossReferenceRS-ID i The fields are included in a sequential manner (from the smallest number 0 to the largest number 15). For example, if Figure 4 As shown in , since the PathlossReferenceRS-ID1 field is not included, the SRS-PathlossReferenceRS-ID0 field is included in front of the SRS-PathlossReferenceRS-ID2 field.

[0070] Specifically, the SRS path loss reference signal indication MAC CE according to the fourth embodiment includes the following fields:

[0071] (1) Serving Cell ID: This field indicates the identity of the serving cell to which the MAC CE applies. The length of the Serving Cell ID field is 5 bits.

[0072] (2) BWP ID: This field indicates the UL BWP that the MAC CE applies to as the code point of the DCI bandwidth part indicator field. The length of the BWP ID field is 2 bits.

[0073] The above-mentioned fields (1)-(2) according to the fourth embodiment are the same as the fields (1)-(2) according to the first embodiment.

[0074] (3)t i field (i.e., t0 to t 15 ): Each t as 1 bit i Indicates whether the PL-RS used for the SRS resource set is indicated or updated by this MAC CE. i When the SRS path loss reference signal indicated by the field is indicated or updated, ti The t field is set to 1. When the PL-RS for this SRS resource set is not updated by this MAC CE (ie, maintained with the existing SRS path loss reference signal), t i field is set to 0. When t i When the field is set to 0, SRS-PathlossReferenceRS-ID is not included i field.

[0075] (4)SRS-PathlossReferenceRS-ID i (i.e., SRS-PathlossReferenceRS-ID0 to SRS-PathlossReferenceRS-ID 15 At least one of the following): When t i When the field is set to 1, it includes SRS-PathlossReferenceRS-ID i Field to be indicated or updated by t i Indicates the SRS path loss reference signal of the SRS resource set. Each SRS-PathlossReferenceRS-ID i The field is 6 bits.

[0076] (5) R: Reserved bit. Each reserved bit can be set to "0".

[0077] According to the fourth embodiment, the SRS path loss reference signal indication MAC CE has a size of 24+8*N bits, where N is the number of SRS resource sets for which the SRS-PathlossReferenceRS-ID is to be indicated (or updated), i.e., t i The field is set to the number of 1s, and N ranges from 1 to 16.

[0078] In the above-mentioned first to fourth embodiments, up to 64 SRS-PathlossReferenceRS may be indicated or updated to the SRS resource set. According to the fifth embodiment, the existing PUCCH-PathlossReferenceRS may be reused as the SRS-PathlossReferenceRS.

[0079] It has been agreed that the total maximum configurable path loss signals for PUCCH, PUSCH and SRS is 64, and it has also been agreed that up to 64 PL-RS for PUCCH can be configured for a UE according to the BWP. Therefore, it is reasonable to use PUCCH-PathlossReferenceRS as the PL-RS indication (or update) for SRS.

[0080] The SRS path loss reference signal indication MAC CE according to the fifth embodiment has the same structure as any of the SRS path loss reference signal indication MAC CEs according to the first to fourth embodiments, except that the SRS-PathlossReferenceRS-ID field (the SRS-PathlossReferenceRS-ID field in the first embodiment, the SRS-PathlossReferenceRS-ID field in the second embodiment) i Field, SRS-PathlossReferenceRS-ID in the third embodiment i Field, SRS-PathlossReferenceRS-ID in the fourth embodiment i The PUCCH-PathlossReferenceRS-Id field is replaced by the PUCCH-PathlossReferenceRS-Id field. i The field indicates the configured SRS-PathlossReferenceRS, and each S i The field indicates the configured PUCCH-PathlossReferenceRS.

[0081] In the first to fourth embodiments described above, an SRS path loss reference signal (SRS-PathlossReferenceRS) is indicated or updated to an SRS resource set. SRS-PathlossReferenceRS can be configured only as SSB or NZP-CSI-RS. According to the sixth embodiment, SSB or NZP-CSI-RS is indicated or updated to an SRS resource set.

[0082] According to the sixth embodiment, the SRS-PathlossReferenceRS-ID field is replaced with a PL-RS ID, which is an ssb-Index or an NZP-CSI-RS-Resource-Index. The UE can monitor 64 SSBs, and up to 128 NZP-CSI-RS resources can be configured for the UE in the BWP according to the UE's capabilities. Therefore, the PL-RS ID can be "0+ssb-Index" or "NZP-CSI-RS-Resource-Index", where the UE can monitor 64 SSBs and up to 128 NZP-CSI-RS resources can be configured for the UE in the BWP according to the UE's capabilities. i The field identifies the RS type (ssb-Index or NZP-CSI-RS-Resource-index).

[0083] The SRS path loss reference signal indication MAC CE according to the sixth embodiment has a structure substantially the same as any SRS path loss reference signal indication MAC CE according to the first to fourth embodiments, except that the SRS-PathlossReferenceRS-ID field (the SRS-PathlossReferenceRS-ID field in the first embodiment, the SRS-PathlossReferenceRS-ID field in the second embodiment) is i Field, SRS-PathlossReferenceRS-ID in the third embodiment i Field, SRS-PathlossReferenceRS-ID in the fourth embodiment i field) is replaced by the PL-RS ID field.

[0084] In particular, each S in the second embodiment i The field indicates the configured SRS-PathlossReferenceRS, and each S i The field indicates the configured PL-RS. In addition, because each SRS-PathlossReferenceRS-ID field occupies 6 bits and each PL-RS ID i The field occupies 7 bits and each F i The field occupies 1 bit, so the two reserved bits in "Oct" which are the same as the SRS-PathlossReferenceRS-ID field and the 6 bits used for the SRS-PathlossReferenceRS-ID field are combined for F in the sixth embodiment. i Field and PL-RS ID i field.

[0085] Figure 5 An example of an SRS path loss reference signal indication MAC CE according to the sixth embodiment is shown, in which the PL-RS is indicated or updated to more than one SRS resource set (similar to the third embodiment). In particular, the following fields are included:

[0086] (1) Serving Cell ID: This field indicates the identity of the serving cell to which the MAC CE applies. The length of the Serving Cell ID field is 5 bits.

[0087] (2) BWP ID: This field indicates the UL BWP that the MAC CE applies to as the code point of the DCI bandwidth part indicator field. The length of the BWP ID field is 2 bits.

[0088] The above-mentioned fields (1)-(2) according to the sixth embodiment are the same as the fields (1)-(2) according to the first embodiment.

[0089] (3)SRS Resource Set ID i : Each SRS Resource Set ID i Indicates the SRS resource set to which the MAC CE applies. Each SRS Resource Set ID i The length of the field is 4 bits because a maximum of 16 SRS resource sets can be configured for a UE in a BWP according to the UE's capabilities.

[0090] The above-mentioned field (3) according to the sixth embodiment is the same as the field (3) according to the third embodiment.

[0091] (4)F i :Each F i Indicates the use of the resource set ID i The SRS-ResourceSetId field indicates the type of PL-RS resources in the SRS resource set. i Set to 1 to indicate the use of NZP CSI-RS resource indexing, and set to 0 to indicate the use of SSB indexing. i The length of is 1 bit.

[0092] (5)PL-RS ID i : Each PL-RS ID i Contains the resource set ID used by the SRS i The SRS-ResourceSetId field indicates the resource identifier of the SRS resource set (path loss reference signal). i is set to 0, this field contains the SSB-Index. i If set to 1, this field contains the NZP-CSI-RS-Resource-Index. i The length of this field is 7 bits. SSB-Index itself occupies 6 bits, while NZP-CSI-RS-Resource-Index occupies 7 bits. Therefore, if SSB-Index is indicated, the first bit of this field is set to 0.

[0093] (6) R: Reserved bit. Each reserved bit can be set to "0".

[0094] Figure 3 and Figure 5The comparison between them can indicate that, in the sixth embodiment, the “SRS-PathlossReferenceRS-ID i " field is the same as the two reserved bits in "Oct" are occupied because "F i " field and "PL-RS ID i The " field occupies a total of eight bits.

[0095] Figure 5 The illustrated SRS path loss reference signal indication MAC CE has a size of 8+16*N bits, where N is the number of SRS resource sets for which PL-RS (SSB or NZP-CSI-RS) is indicated (updated), and N ranges from 1 to 16.

[0096] In the first to sixth embodiments, each SRS resource set is individually indicated or updated with an SRS path loss reference signal. If the same SRS path loss reference signal is to be used to indicate or update multiple SRS resource sets configured for different BWPs in different cells, this may be inefficient.

[0097] According to the seventh embodiment, all SRS resource sets configured in all BWPs on multiple cells having the same SRS resource set ID may be indicated or updated with the same SRS path loss reference signal.

[0098] It has been agreed to support simultaneous spatial relation updates for SP and / or AP SRS resources across multiple CCs / BWPs by MAC CE. Up to 2 lists of CCs can be configured by RRC for each UE, for example, simultaneousSpatialRelationCellList0 and simultaneousSpatialRelationCellList1. This means that aperiodic and / or semi-persistent SRS resources with the same SRS resource ID in all BWPs on all cells included in simultaneousSpatialRelationCellList can share the same spatial relation for transmission.

[0099] When one or more simultaneousSpatialRelationCellLists (i.e., simultaneousSpatialRelationCellList0 and / or simultaneousSpatialRelationCellList1) are configured for the UE and the UE receives an SRS path loss reference signal indication MAC CE for a BWP, if the serving cell ID indicated by the serving cell ID field in the MAC CE is included in a simultaneousSpatialRelationCellList, for all BWPs in all cells within this simultaneousSpatialRelationCellList containing the serving cell ID, the indicated path loss reference signal is configured (indicated or updated) for all SRS resource sets with the same SRS resource set ID.

[0100] The SRS path loss reference signal indication MAC CE according to the seventh embodiment has the same structure as any one of the SRS path loss reference signal indication MAC CEs according to the first to sixth embodiments. In the first to sixth embodiments, one PL-RS is indicated or updated for only one SRS resource set (the SRS path loss reference signal indicated by SRS-PathlossReferenceRS-ID in the first embodiment, the SRS path loss reference signal indicated by SRS-PathlossReferenceRS-ID in the second embodiment). i The SRS path loss reference signal indicated by SRS-PathlossReferenceRS-ID in the third embodiment and the fourth embodiment i Each SRS path loss reference signal indicated by the PL-RS ID i However, in the seventh embodiment, according to the service cell ID field included in the MACCE, one PL-RS can be indicated or updated for multiple SRS resource sets, that is, all SRS resource sets with the same SRS resource set ID for all BWPs in all cells within the simultaneousSpatialRelationCellList of the service cell ID indicated by the service cell ID field.

[0101] For example, it is assumed that cell 1, cell 2, and cell 3 are in simultaneousSpatialRelationCellList0, and the serving cell ID of the SRS path loss reference signal indication MAC CE according to the seventh embodiment is cell 1. Under this condition, for all BWPs (e.g., BWP1, BWP2, BWP3, and BWP4) of all cells (e.g., cell 1, cell 2, and cell 3) in simultaneousSpatialRelationCellList0, a SRS ResourceSet ID is provided to the BWPs having the same SRS ResourceSet ID. i The SRS resource set indication or update is performed by including the PL-RS ID in the MAC CE according to the seventh embodiment i (For example, SRS-PathlossReferenceRS-ID i , or PL-RS ID i ) indicates the SRS path loss reference signal.

[0102] Figure 6 6 is a schematic flow chart illustrating an embodiment of a method 600 for configuring an SRS path loss reference signal for an SRS resource set. In some embodiments, the method 600 is performed by an apparatus such as a base station unit. In some embodiments, the method 600 may be performed by a processor executing program code, such as a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, an FPGA, etc.

[0103] The method 600 may include configuring a path loss reference signal for one or more SRS resource sets by using a MAC CE at 602, and transmitting a PDSCH carrying the MAC CE at 604. The MAC CE can be an SRS path loss reference signal indication MAC CE according to any one of the first to seventh embodiments.

[0104] Figure 7 is a schematic flow chart illustrating an embodiment of a method 700 for configuring an SRS path loss reference signal for an SRS resource set. In some embodiments, the method 700 is performed by an apparatus such as a remote unit (UE). In some embodiments, the method 700 may be performed by a processor executing program code, such as a microcontroller, a microprocessor, a CPU, a GPU, an auxiliary processing unit, an FPGA, etc.

[0105] The method 700 may include receiving a PDSCH carrying a MAC CE at 702, wherein the MAC CE is used to configure a path loss reference signal for one or more SRS resource sets. The MAC CE can be an SRS path loss reference signal indication MAC CE according to any one of the first to seventh embodiments.

[0106] Figure 8 is a schematic block diagram illustrating an apparatus according to one embodiment.

[0107] refer to Figure 8 , UE (ie, remote unit) includes a processor, a memory and a transceiver. The processor is implemented in Figure 7 The functions, processes and / or methods proposed in the gNB (i.e., base station unit) include a processor, a memory and a transceiver. The processor is implemented in Figure 6 The functions, processes and / or methods proposed in the present invention are described in detail. The layers of the radio interface protocol can be implemented by a processor. The memory is connected to the processor to store various pieces of information for driving the processor. The transceiver is connected to the processor to send and / or receive radio signals. Needless to say, the transceiver can be implemented as a transmitter for sending radio signals and a receiver for receiving radio signals.

[0108] The memory may be located inside or outside the processor and connected to the processor through various well-known means.

[0109] In the above-described embodiments, the components and features of the embodiments are combined in a predetermined form. Unless otherwise explicitly stated, each component or function should be considered as an option. Each component or feature can be implemented to be not associated with other components or features. In addition, the embodiments can be configured by associating some components and / or features. The order of the operations described in the embodiments can be changed. Some components or features of any embodiment can be included in another embodiment or replaced with components and features corresponding to another embodiment. It is obvious that claims that are not explicitly cited in the claims are combined to form embodiments or are included in new claims.

[0110] The embodiments may be implemented by hardware, firmware, software or a combination thereof. In the case of being implemented by hardware, according to the hardware implementation, the exemplary embodiments described herein may be implemented by using one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.

[0111] Embodiments may be practiced in other specific forms. The described embodiments are to be considered in all respects as merely illustrative and not restrictive. The scope of the present invention is therefore indicated by the appended claims rather than by the preceding description. All changes falling within the equivalent meaning and scope of the claims should be included within their scope.

Claims

1. A method performed by a base station unit, comprising: Configuring a path loss reference signal for one or more SRS resource sets by using a MAC CE; as well as Sending a PDSCH carrying the MAC CE, The MAC CE includes one or more SRS resource set IDs, each of the one or more SRS resource set IDs indicates an SRS resource set to which the MAC CE applies, and The MAC CE further includes one or more SRS path loss reference signal IDs, each of the one or more SRS path loss reference signal IDs indicates a path loss reference signal configured for the SRS resource set indicated by the SRS resource set ID in the MAC CE.

2. The method according to claim 1, wherein: The MAC CE includes a single SRS resource set ID and S i The bitmap, Each S is 1 bit i Indicates the activation status of the configured SRS path loss reference signal, and Only a single SRS resource set is activated for the SRS resource set indicated by the single SRS resource set ID. i .

3. The method according to claim 1, wherein: The MAC CE includes t i The bitmap, Each t is 1 bit i Indicates the SRS resource set ID, Each t i Indicates whether the MAC CE applies to the SRS resource set with SRS resource set ID equal to i.

4. The method according to claim 1, wherein: The MAC CE includes a PL-RS ID, wherein the PL-RS ID is an ssb-Index indicating an SS / PBCH block or a csi-RS-Index indicating an NZP CSI-RS resource, wherein the SS / PBCH block or the NZP CSI-RS resource is used as the path loss reference signal configured by the SRS resource set indicated by the SRS resource set ID.

5. The method according to claim 4, wherein: The MAC CE further includes a one-bit field to indicate whether the PL-RS ID is the ssb-Index or the csi-RS-Index.

6. The method according to claim 1, wherein: The MAC CE includes a serving cell ID, When the serving cell ID is in the simultaneousSpatialRelationCellList, for all BWPs in the cells in the simultaneousSpatialRelationCellList containing the serving cell ID, the path loss reference signal is configured for all SRS resource sets having the same SRS resource set ID.

7. A method performed by a remote unit, comprising: receiving a PDSCH carrying a MAC CE, wherein the MAC CE is used to configure a path loss reference signal for one or more SRS resource sets, The MAC CE includes one or more SRS resource set IDs, each of the one or more SRS resource set IDs indicates an SRS resource set to which the MAC CE applies, and The MAC CE further includes one or more SRS path loss reference signal IDs, each of the one or more SRS path loss reference signal IDs indicates a path loss reference signal configured for the SRS resource set indicated by the SRS resource set ID in the MAC CE.

8. The method according to claim 7, wherein: The MAC CE includes a single SRS resource set ID and S i The bitmap, Each S is 1 bit i Indicates the activation status of the configured SRS path loss reference signal, and Only a single SRS resource set is activated for the SRS resource set indicated by the single SRS resource set ID. i .

9. The method according to claim 7, wherein: The MAC CE includes t i The bitmap, Each t is 1 bit i Indicates the SRS resource set ID, Each t i Indicates whether the MAC CE applies to the SRS resource set with SRS resource set ID equal to i.

10. The method according to claim 7, wherein: The MAC CE includes a PL-RS ID, wherein the PL-RS ID is an ssb-Index indicating an SS / PBCH block or a csi-RS-Index indicating an NZP CSI-RS resource, wherein the SS / PBCH block or the NZP CSI-RS resource is used as the path loss reference signal configured by the SRS resource set indicated by the SRS resource set ID.

11. The method according to claim 10, wherein: The MAC CE further includes a one-bit field to indicate whether the PL-RS ID is the ssb-Index or the csi-RS-Index.

12. The method according to claim 7, wherein: The MAC CE includes a serving cell ID, When the serving cell ID is in the simultaneousSpatialRelationCellList, for all BWPs in the cells in the simultaneousSpatialRelationCellList containing the serving cell ID, the path loss reference signal is configured for all SRS resource sets having the same SRS resource set ID.

13. A base station unit, comprising: a processor configured to configure a path loss reference signal for one or more SRS resource sets by using a MAC CE; as well as a transmitter, the transmitter being configured to send a PDSCH carrying the MAC CE, The MAC CE includes one or more SRS resource set IDs, each of the one or more SRS resource set IDs indicates an SRS resource set to which the MAC CE applies, and The MAC CE further includes one or more SRS path loss reference signal IDs, each of the one or more SRS path loss reference signal IDs indicates a path loss reference signal configured for the SRS resource set indicated by the SRS resource set ID in the MAC CE.

14. The base station unit according to claim 13, wherein: The MAC CE includes a single SRS resource set ID and S i The bitmap, Each S is 1 bit i Indicates the activation status of the configured SRS path loss reference signal, and Only a single SRS resource set is activated for the SRS resource set indicated by the single SRS resource set ID. i .

15. The base station unit according to claim 13, wherein: The MAC CE includes t i The bitmap, Each t is 1 bit i Indicates the SRS resource set ID, Each t i Indicates whether the MAC CE applies to the SRS resource set with SRS resource set ID equal to i.

16. The base station unit according to claim 13, wherein: The MAC CE includes a PL-RS ID, wherein the PL-RS ID is an ssb-Index indicating an SS / PBCH block or a csi-RS-Index indicating an NZP CSI-RS resource, wherein the SS / PBCH block or the NZP CSI-RS resource is used as the path loss reference signal configured by the SRS resource set indicated by the SRS resource set ID.

17. The base station unit according to claim 16, wherein: The MAC CE further includes a one-bit field to indicate whether the PL-RS ID is the ssb-Index or the csi-RS-Index.

18. The base station unit of claim 13, wherein: The MAC CE includes a serving cell ID, When the serving cell ID is in the simultaneousSpatialRelationCellList, for all BWPs in the cells in the simultaneousSpatialRelationCellList containing the serving cell ID, the path loss reference signal is configured for all SRS resource sets having the same SRS resource set ID.

19. A remote unit comprising: a receiver, the receiver being configured to receive a PDSCH carrying a MAC CE, wherein the MAC CE is used to configure a path loss reference signal for one or more SRS resource sets, The MAC CE includes one or more SRS resource set IDs, each of the one or more SRS resource set IDs indicates an SRS resource set to which the MAC CE is applied, The MAC CE further includes one or more SRS path loss reference signal IDs, each of the one or more SRS path loss reference signal IDs indicates a path loss reference signal configured for the SRS resource set indicated by the SRS resource set ID in the MAC CE.

20. The remote unit of claim 19, wherein: The MAC CE includes a single SRS resource set ID and S i The bitmap, Each S is 1 bit i Indicates the activation status of the configured SRS path loss reference signal, and Only a single SRS resource set is activated for the SRS resource set indicated by the single SRS resource set ID. i .

21. The remote unit of claim 19, wherein: The MAC CE includes t i The bitmap, Each t is 1 bit i Indicates the SRS resource set ID, Each t i Indicates whether the MAC CE applies to the SRS resource set with SRS resource set ID equal to i.

22. The remote unit of claim 19, wherein: The MAC CE includes a PL-RS ID, wherein the PL-RS ID is an ssb-Index indicating an SS / PBCH block or a csi-RS-Index indicating an NZP CSI-RS resource, wherein the SS / PBCH block or the NZP CSI-RS resource is used as the path loss reference signal configured by the SRS resource set indicated by the SRS resource set ID.

23. The remote unit of claim 22, wherein: The MAC CE further includes a one-bit field to indicate whether the PL-RS ID is the ssb-Index or the csi-RS-Index.

24. The remote unit of claim 19, wherein: The MAC CE includes a serving cell ID, When the serving cell ID is in the simultaneousSpatialRelationCellList, for all BWPs in the cells in the simultaneousSpatialRelationCellList containing the serving cell ID, the path loss reference signal is configured for all SRS resource sets having the same SRS resource set ID.

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