Additional SRS Power Headroom Report

Abstract

A method and apparatus for power headroom reporting of an additional SRS are disclosed. A method at a UE includes: if an SRS is transmitted on an additional SRS symbol in a normal subframe, calculating a power headroom (PH) according to the additional SRS; and reporting, by a MAC CE, at least one of the PH calculated according to the additional SRS, Type‑3 PH, and Type‑1 PH.

Description

Technical Field

[0001] The subject matter disclosed herein relates generally to wireless communications, and more particularly, to methods and apparatus for power headroom reporting of additional SRS. Background Art

[0002] The following abbreviations are defined herein and some of them are referred to in the following description: 3rd Generation Partnership Project (3GPP), Frequency Division Duplex (FDD), 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), User Equipment (UE), Uplink (UL), Evolved Node B (eNB), Next Generation Node B (gNB), Downlink (DL), Central Processing Unit (CPU), Graphics Processing Unit (GPU), Field Programmable Gate Array (FPGA) ), dynamic RAM (DRAM), physical uplink shared channel (PUSCH), physical uplink control channel (PUCCH), physical downlink control channel (PDCCH), sounding reference signal (SRS), SRS resource indicator (SRI), downlink control information (DCI), resource block (RB), time division duplex (TDD), radio resource control (RRC), medium access control (MAC), power headroom (PH), power headroom report (PHR), authorization assisted access (LAA), listen before talk (LBT), maximum power reduction (MPR), additional maximum power reduction (A-MPR), power management maximum power reduction (P-MPR), uplink pilot time slot (UpPTS).

[0003] SRS is transmitted on the uplink channel to allow the base station to estimate the state of the uplink channel. Assuming reciprocity of the downlink and uplink channels, SRS transmission can also be used for uplink timing estimation as well as estimating downlink channel conditions.

[0004] Currently, enhancements to SRS capacity and coverage have been approved in LTE Release 16. In LTE Release 16, more than one symbol in a normal subframe can be used for SRS transmission. SRS transmitted at symbols other than the last symbol in a normal subframe is called additional SRS, and symbols other than the last symbol in a normal subframe are called additional SRS symbols. Non-periodic SRS transmission in additional SRS symbols can be configured in any symbol except the last symbol in a normal subframe. SRS transmitted at the last symbol in a normal subframe is called legacy SRS. The SRS introduced in Release 14 LTE can also be transmitted in UpPTS, which is a special subframe, and it is called Release 14 SRS.

[0005] Additional SRS, legacy SRS and Release 14 SRS can be transmitted in the same subframe with or without PUSCH / PUCCH. In the following, PUSCH / PUCCH means PUSCH and / or PUCCH. When legacy SRS and / or additional SRS and / or Release 14 SRS and / or PUSCH / PUCCH are configured for SCell, a potential problem is how to report different types of power headroom.

[0006] The extended PHR MAC control element is defined in Release 15. Type-2 and Type-1 PH are reported for PCell, while Type-3 or Type-1 PH is reported for SCell, depending on whether the higher layer parameter ul-Configuration-r14 is configured for the SCell. If ul-Configuration-r14 is configured, which means carrier switching based SRS, that is, Release 14 SRS is configured for the SCell without PUSCH / PUCCH, then Type-3 PH is reported. Otherwise (i.e., ul-Configuration-r14 is not configured), Type-1 PH is reported. Type-1 or Type-2 PH is calculated based on PUSCH / PUCCH and defined in Release 15 LTE specification TS 36.213. Type-3 PH is calculated based on Release 14 SRS and defined in Release 15 LTE specification TS 36.213. Summary of the invention

[0007] The purpose of the present application is to propose a method and apparatus for power headroom reporting of an additional SRS.

[0008] In one embodiment, a method at a UE includes: if an SRS is transmitted on an additional SRS symbol in a normal subframe, calculating a power headroom (PH) based on the additional SRS; and reporting, by a MAC CE, at least one of the PH calculated based on the additional SRS, a Type-3 PH, and a Type-1 PH.

[0009] In some embodiments, the UE is configured with the LAA SCell for uplink transmission. The method may also include receiving a PDCCH or an EPDCCH to schedule a non-periodic SRS transmission on an additional SRS symbol on the LAA SCell in subframe i, wherein, regardless of whether the UE can access the LAA SCell for the additional SRS transmission in subframe i, assuming that the UE performs a non-periodic additional SRS transmission on the LAA SCell in subframe i, to calculate the power headroom of the additional SRS according to subframe i.

[0010] In some embodiments, if an additional SRS is configured for the SCell without PUSCH / PUCCH, a PH calculated based on the additional SRS is reported for this SCell; if no additional SRS is configured for the SCell but ul-Configuration-r14 is configured, a Type-3 PH is reported for this SCell; and if PUSCH / PUCCH is configured, a Type-1 PH is reported for the SCell.

[0011] In some embodiments, if ul-Configuration-r14 is configured for the SCell, Type-3 PH is reported for this SCell; if ul-Configuration-r14 is not configured for the SCell but an additional SRS is configured without PUSCH / PUCCH, the PH calculated based on the additional SRS is reported for this SCell; and if PUSCH / PUCCH is configured, Type-1 PH is reported for the SCell.

[0012] In another embodiment, if an additional SRS is configured for the SCell without PUSCH / PUCCH and ul-Configuration-r14, a PH calculated from the additional SRS is reported for the SCell; if both additional SRS and ul-Configuration-r14 are configured for the SCell without PUSCH / PUCCH, a Type-3 PH and a PH calculated from the additional SRS are reported for the SCell; if an additional SRS is configured for the SCell with PUSCH / PUCCH, a PH calculated from the additional SRS and a Type-1 PH are reported for the SCell; if an additional SRS is not configured for the SCell but ul-Configuration-r14 is configured, a Type-3 PH is reported for the SCell; and if an additional SRS is not configured for the SCell but PUSCH / PUCCH is configured, a Type-1 PH is reported for the SCell. In particular, when two PH values ​​are reported for one SCell, at most one associated P for one or both PH values ​​is reported. CMAX，c field.

[0013] In some embodiments, if the UE transmits an additional SRS in a normal subframe i for a serving cell c having a frame structure Type-1 and / or Type-2 and / or Type-3, the PH type3A，c (i) = P CMAX，c (i)-{10log 10 (M Additional_SRS，c )+P O_Additional_SRS，c +α Additional_SRS，c ·PL c +f Additional_SRS，c (i)} to calculate the PH calculated based on the additional SRS; and if the UE does not actually transmit the additional SRS, use To calculate the PH calculated based on the additional SRS.

[0014] In some embodiments, the UE includes: a processor configured to: calculate a power headroom (PH) based on the additional SRS if the SRS is transmitted on the additional SRS symbol in a normal subframe; and a transmitter configured to: report, by a MAC CE, at least one of the PH calculated based on the additional SRS, Type-3 PH, and Type-1 PH.

[0015] In another embodiment, a method at a base station unit includes: configuring a UE for uplink transmission with an LAA SCell; and receiving a report on a power headroom (PH) for an additional SRS, wherein the report includes at least one of a PH calculated based on the additional SRS, a Type-3 PH, and a Type-1 PH.

[0016] In another embodiment, a base station unit includes: a processor configured to configure a UE for uplink transmission with an LAA SCell; and a receiver configured to receive a report on a power headroom (PH) for an additional SRS, wherein the report includes at least one of a PH calculated based on the additional SRS, a Type-3 PH, and a Type-1 PH.

[0017] Those skilled in the art will appreciate that the effects that can be achieved using the present disclosure are not limited to the contents specifically described above, and the above and other effects that can be achieved by the present disclosure will be more clearly understood from the following specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] A more particular description of the embodiments briefly described above will be presented by reference to specific embodiments illustrated in the accompanying drawings. Understanding that these drawings depict only some embodiments and are not therefore to be considered limiting in scope, the embodiments will be described and explained with additional particularity and detail using the accompanying drawings, in which:

[0019] Figure 1 Show rule 1;

[0020] Figure 2 An example of an enhanced extended PHR MAC CE format according to the first embodiment is shown;

[0021] Figure 3 Show rule 2;

[0022] Figure 4 An example of an enhanced extended PHR MAC CE format according to the second embodiment is shown;

[0023] Figure 5 Show rule 3;

[0024] Figure 6 An example of an enhanced extended PHR MAC CE format according to the third embodiment is shown;

[0025] Figure 7 is a schematic flow chart illustrating an embodiment of a method for additional SRS power headroom reporting;

[0026] Figure 8 is a schematic flow chart showing another embodiment of a method for additional SRS power headroom reporting; and

[0027] Fig. 9 is a schematic block diagram showing an apparatus according to one embodiment. DETAILED DESCRIPTION

[0028] 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, all of 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 that store machine-readable code, computer-readable code, and / or program code, hereinafter referred to as "code." The storage device may be tangible, non-temporary, and / or non-transmitting. The storage device may not contain signals. In some embodiments, the storage device uses only signals to access the code.

[0029] Certain functional units described in this specification may be labeled as "modules" to more specifically emphasize their independent implementation. For example, a module may be implemented as a hardware circuit, including a custom very large scale integration (VLSI) circuit or gate array, an off-the-shelf semiconductor such as a logic chip, a transistor, or other discrete components. A module may also be implemented in a programmable hardware device such as a field programmable gate array, a programmable array logic, a programmable logic device, etc.

[0030] Modules may also be implemented in code and / or software for execution by various types of processors. For example, an identified code module may include one or more physical or logical blocks of executable code, which may be organized, for example, as objects, procedures, or functions. However, the executables of the identified modules need not be physically located together, but may include different instructions stored in different locations, which, when logically connected together, comprise the module and achieve the stated purpose of the module.

[0031] In fact, a code module may include a single instruction or many instructions, and may even be distributed on several different code segments, in different programs, and on several memory devices. Similarly, operational data may be identified and illustrated in this article within a module, and may be embodied in any suitable form and organized in a data structure of any suitable type. The operational data may be collected as a single data set, or may be distributed in different locations including different computer-readable storage devices. When a module or a portion of a module is implemented with software, the software portion is stored on one or more computer-readable storage devices.

[0032] 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.

[0033] A non-exhaustive list of more specific examples of storage devices would include the following: an electrical connection having one or more conductors, 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 above. 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.

[0034] The code for performing the operation of the embodiment can be any number of lines and can be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Python, Ruby, Java, Smalltalk, C++, and conventional procedural programming languages ​​such as the "C" programming language, and / or machine languages ​​such as assembly languages. The code can be executed entirely on the user's computer, partially on the user's computer, as a separate 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 case, the remote computer can 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 to an external computer can be made (e.g., through the Internet using an Internet service provider).

[0035] References throughout this specification to "one embodiment," "an embodiment," or similar language are intended to include, in at least one embodiment, a particular feature, structure, or characteristic described in conjunction with that embodiment. Thus, unless expressly stated otherwise, the appearances of the phrases "in one embodiment," "in an embodiment," and similar language throughout this specification may, but need not, all refer to the same embodiment, but mean "one or more but not all embodiments." Unless expressly stated otherwise, the terms "including," "comprising," "having," and variations thereof mean "including but not limited to." Unless expressly stated otherwise, enumerating a list of items does not mean that any or all of the items are mutually exclusive. Unless expressly stated otherwise, the terms "a," "an," and "the" also refer to "one or more."

[0036] In addition, the described features, structures or characteristics of various embodiments may be combined in any suitable manner. In the following description, numerous 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 any ambiguity in various aspects of the embodiments.

[0037] 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 charts and / or schematic block diagrams and the combination of frames in the schematic flow charts and / or schematic block diagrams 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 the processor of the computer or other programmable data processing device create components for implementing the functions specified in the frames or some frames of the schematic flow charts and / or schematic block diagrams.

[0038] The code may also be stored in a storage device that can direct a computer, other programmable data processing apparatus, or other device to operate in a specific manner, so that the instructions stored in the storage device produce an article of manufacture including instructions that implement the functions specified in the boxes or some boxes in the schematic flowchart and / or schematic block diagram.

[0039] The code may also be loaded onto a computer, other programmable data processing apparatus, or other device, so that a series of operational steps are 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.

[0040] The schematic flow charts and / or schematic block diagrams in the accompanying drawings illustrate the architecture, functionality and operation of possible implementations of devices, systems, methods and program products 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 a code, which includes one or more executable instructions of the code for implementing a specified logical function.

[0041] It should also be noted that in some alternative implementations, the functions indicated in the blocks may not occur in the order shown in the 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 functionality involved. Other steps and methods are contemplated that are equivalent in function, logic, or effect to one or more blocks or portions thereof shown in the figures.

[0042] Although various arrow types and line types can be used in flow charts and / or block diagrams, it should be understood that they do not limit the scope of the corresponding embodiments. In fact, some arrows or other connectors can be used to indicate only the logical flow of the depicted embodiment. For example, an arrow can indicate a waiting or monitoring period of unspecified duration between the enumerated steps of the depicted embodiment. It will also be noted that each box in the block diagram and / or flow chart and the combination of boxes in the block diagram and / or flow chart can be implemented by a system based on dedicated hardware or a combination of dedicated hardware and code that performs a specified function or action.

[0043] The description of an element in each figure may refer to the elements of the previous figure. The same numbers refer to the same elements in all figures, including alternative embodiments of the same elements.

[0044] Licensed Assisted Access (LAA) is a technology in which the carrier in the licensed band acts as the PCell and the carrier in the unlicensed band is used as the SCell. For the LAA SCell, the LBT (Listen Before Talk) channel access procedure is adopted. That is, the UE can actually use the channel for transmission only when the channel is idle (unused). When the UE is scheduled to transmit PUSCH or SRS in the LAA SCell, LBT should be performed before the PUSCH or SRS transmission. If the UE cannot access the LAA SCell before the start symbol of the transmission of PUSCH or SRS, the corresponding PUSCH or SRS should be discarded.

[0045] According to the present disclosure, if a UE is configured with an LAA SCell for uplink transmission, and the UE receives a PDCCH or EPDCCH to schedule non-periodic SRS transmission on additional SRS symbols on the LAA SCell in subframe i, regardless of whether the UE is able to access the LAA SCell for additional SRS transmission in subframe i according to the LBT channel access procedure, it is assumed that the UE performs non-periodic additional SRS transmission on the LAA SCell in subframe i, and the power margin of subframe i is calculated.

[0046] A new PH (power headroom) type, such as PH Type-3A, can be defined as follows:

[0047] If the UE transmits additional SRS in a normal subframe i for a serving cell c with frame structure Type-1 and / or Type-2 and / or Type-3 with or without PUSCH / PUCCH, it calculates the power headroom PH reported by Type-3A using the following formula: type3A，c (i) = P CMAX，c (i)-{10log 10 (M Additional_SRS，c )+P O_Additional_SRS，c +α Additional_SRS，c ·PL c +f Additional_SRS，c (i)}[dB] Otherwise (which means that the UE does not actually transmit additional SRS, e.g. due to failure of the LBT channel access procedure), the power headroom reported by Type-3A is calculated using the following formula:

[0048]

[0049] In the above equation,

[0050] P CMAX，c (i) is the configured UE maximum transmission power in subframe i for serving cell c.

[0051] P O_Additional_SRS，c It is the component P configured by the higher layer parameters p0-Nominal-additionalSRS and p0-UE-additionalSRS for additional SRS. O_Additional_Normal_SRS，c and component P O_UE_Additional_SRS，c The parameters that constitute the and.

[0052] M Additional_SRS，c is the bandwidth used for additional SRS transmission in subframe i of serving cell c, expressed in the number of RBs.

[0053] α Additional_SRS，c It is the value of the higher layer parameter alpha-additionalSRS configured by the higher layer for serving cell c.

[0054] PL c is the downlink path loss estimate calculated in the UE for serving cell c, in dB. Additional_SRS，c (i) is the current SRS power control adjustment state determined by the TPC command carried by DCI format 3 / 3A / 3B.

[0055] Assume SRS transmission in subframe i, and assume MPR (maximum power reduction) = 0 dB, A-MPR (additional maximum power reduction) = 0 dB, P-MPR (power management maximum power reduction) = 0 dB and T C = 0dB, to calculate For this case, the physical layer replaces P CMAX，c (i) will Transfer to the upper level.

[0056] As can be seen above, the power headroom reported by Type-3A is calculated based on the additional SRS.

[0057] Since PH Type-3A was newly added, new rules for reporting power headroom were discussed.

[0058] Similar to Release 15, Type-2 and Type-1 PH are reported for PCell. For SCell, Type-1 and / or Type-3 and / or Type-3 APH may be reported.

[0059] Type-1 PH is calculated based on PUSCH / PUCCH. Therefore, Type-1 PH can be reported when PUSCH / PUCCH is transmitted. Type-3 PH is calculated based on legacy SRS or SRS transmitted in UpPTS. Therefore, Type-3 PH can be reported when SRS is transmitted in legacy SRS symbols or UpPTS. Type-3 APH is calculated based on additional SRS. Therefore, Type-3 APH can be reported when additional SRS is transmitted.

[0060] According to the first embodiment, Rule 1 is applied. Figure 1 Rule 1 is shown. In step 110, it is determined whether to configure additional SRS for SCell without PUSCH / PUCCH. If the determination result of step 110 is yes, Type-3 APH is reported in step 120. If the determination result of step 110 is no, it is determined in step 130 whether ul-Configuration-r14 is configured. If the determination result of step 130 is yes, Type-3 PH is reported in step 140. If the determination result of step 130 is no, Type-1 PH is reported in step 150.

[0061] Table 1 summarizes Rule 1.

[0062] Additional SRS ul-Configuration-r14 PUSCH / PUCCH PH to be reported Configuration Configuration Configuration Type-1 Configuration Configuration Not configured Type-3A Configuration Not configured Configuration Type-1 Configuration Not configured Not configured Type-3A Not configured Configuration Configuration Type-1 Not configured Configuration Not configured Type-3 Not configured Not configured Configuration Type-1

[0063] Figure 2 An example of the enhanced extended PHR MAC CE format according to the first embodiment is shown, in which Rule 1 is adopted.

[0064] exist Figure 2In the example shown, 8 serving cells are configured for uplink transmission, one of which is the PCell and the other seven (7) serving cells are SCells. The PHR MAC CE is identified by a MAC PDU subheader with a dedicated LCID. It has a variable size.

[0065] The fields contained in the enhanced extended PHR MAC CE are defined as follows:

[0066] C i : This field indicates the presence of the PH field of the SCell with SCellIndex i. C i The PH field indicates that the SCell with SCellIndex i is reported. C set to "0" i The field indicates that the PH field of the SCell with SCellIndexi is not reported.

[0067] R: Reserved bit, set to "0".

[0068] V: This field indicates whether the PH value is based on real transmission or reference format. For Type-1 PH, V=0 indicates real transmission on PUSCH, and V=1 indicates the use of PUSCH reference format. For Type-2PH, V=0 indicates real transmission on PUCCH / SPUCCH, and V=1 indicates the use of PUCCH / SPUCCH reference format. For Type-3 PH, V=0 indicates real transmission on legacy SRS, and V=1 indicates the use of SRS reference format. For Type-3APH, V=0 indicates real transmission on additional SRS, and V=1 indicates the use of SRS reference format. In addition, for Type-1, Type-2, Type-3, and Type-3APH, V=0 indicates the presence of a frame containing the associated P CMAX,c octets of the field, and V=1 indicates that the associated P CMAX,c The octets of the field are omitted;

[0069] Power Headroom (PH): This field indicates the power headroom level. The length of this field is 6 bits, which means that 64 different power headroom levels can be defined.

[0070] P: This field indicates whether the MAC entity applies power backoff due to power management. If power backoff is not applied due to power management, then if the corresponding P CMAX,c The field will have different values, the MAC entity shall set P = 1;

[0071] P CMAX,c : If present, this field indicates the P used to calculate the preceding PH field. CMAx，c or

[0072] The first octet indicates the presence of PH for each SCell.

[0073] When Type-2PH is reported for PCell, the next octet contains the "P" field, the "V" field, and the Type-2PH field. When the "V" field in this octet is set to "0", the next octet contains the "P" field, the "V" field, and the Type-2PH field. CMAX,c " field is used to calculate the previous PH field (i.e., Type-2PH field).

[0074] The next octet contains the "P" field, "V" field, and Type-1 PH field of the PCell. If the "V" field in this octet is set to 0, the next octet contains the "P" field, the "V" field, and the Type-1 PH field of the PCell. CMAX,c " field is used to calculate the previous PH field (i.e., Type-1 PH field).

[0075] The next octet is the Type-x PH field for the SCell and the associated P CMAX,c Fields (if reported), in ascending order based on ServCellIndex (provided that the associated C i According to the first embodiment, when additional SRS is configured for this SCell without PUSCH / PUCCH, x is equal to 3A. If additional SRS is not configured, but ul-Configuration-r14 is configured, x is equal to 3. Otherwise (i.e., PUSCH / PUCCH is configured), x is equal to 1. If the "V" field contained in the previous octet containing the Type-x PH field is set to "1", each Type-x PH field of the SCell will be followed by a 8-bit byte containing the associated PUSCH. CMAX,c The octet of the field.

[0076] According to the second embodiment, Rule 2 is applied. Figure 3 Rule 2 is shown. In step 310, it is determined whether ul-Configuration-r14 is configured for the SCell without PUSCH / PUCCH. If the determination result of step 310 is yes, a Type-3 PH is reported in step 320. If the determination result of step 310 is no, it is determined in step 330 whether an additional SRS is configured without PUSCH / PUCCH. If the determination result of step 330 is yes, a Type-3 APH is reported in step 340. If the determination result of step 330 is no, a Type-1 PH is reported in step 350.

[0077] Table 2 summarizes Rule 2.

[0078] Additional SRS ul-Configuration-r14 PUSCH / PUCCH PH to be reported Configuration Configuration Configuration Type-1 Configuration Configuration Not configured Type-3 Configuration Not configured Configuration Type-1 Configuration Not configured Not configured Type-3A Not configured Configuration Configuration Type-1 Not configured Configuration Not configured Type-3 Not configured Not configured Configuration Type-1

[0079] Figure 4 An example of the enhanced extended PHR MAC CE format according to the second embodiment is shown, in which Rule 2 is adopted.

[0080] exist Figure 4 In the example shown, 8 serving cells are configured for uplink transmission, one of which is the PCell and the other seven (7) serving cells are SCells. In addition, PUCCH on the SCell is supported. The PHR MAC CE is identified by a MAC PDU subheader with a dedicated LCID. It has a variable size.

[0081] Figure 4 The definitions of the fields included in the enhanced extended PHR MAC CE shown are basically the same as those in reference Figure 2 Same as described.

[0082] The first octet indicates the presence of a PH for each SCell. Figure 4 In the example of , the configured uplinks are 7 or less. If 8 or more uplinks are configured, four octets are used to indicate the presence of a PH for each SCell.

[0083] When Type-2PH is reported for PCell, the next octet contains the "P" field, the "V" field, and the Type-2PH field. When the "V" field in this octet is set to "0", the next octet contains the "P" field, the "V" field, and the Type-2PH field. CMAX,c " field is used to calculate the previous PH field (i.e., Type-2PH field).

[0084] The next octet contains the "P" field, "V" field, and Type-2PH field of the SCell. If the "V" field in this octet is set to 0, the next octet contains the "P" field, the "V" field, and the Type-2PH field of the SCell. CMAX,c " field is used to calculate the previous PH field (i.e., the Type-2 PH field for SCell).

[0085] The next octet contains the "P" field, "V" field, and Type-1 PH field of the PCell. If the "V" field in this octet is set to 0, the next octet contains the "P" field, the "V" field, and the Type-1 PH field of the PCell. CMAX,c " field is used to calculate the previous PH field (i.e., the Type-1 PH field for PCell).

[0086] The next octet is the Type-xPH field for the SCell and the associated P CMAX,c Fields (if reported), in ascending order based on ServCellIndex (provided that the associated C i field is set to 1). According to the second embodiment, when ul-Configuration-r14 is configured, x is equal to 3. If ul-Configuration-r14 is not configured without PUSCH / PUCCH but additional SRS is configured, x is equal to 3A. Otherwise (i.e., PUSCH / PUCCH is configured), x is equal to 1. If the "V" field contained in the previous octet containing the Type-x PH field is set to "1", each Type-x PH field of the SCell will be followed by a 8-bit byte containing the associated PUSCH. CMAX,c The octet of the field.

[0087] According to the third embodiment, Rule 3 is applied. Figure 5 Rule 3 is shown.

[0088] In step 510, it is determined whether an additional SRS is configured for the SCell without ul-Configuration-r14 and without PUSCH / PUCCH. If the determination result of step 510 is yes, Type-3 APH is reported in step 520. If the determination result of step 510 is no, it is determined in step 530 whether an additional SRS and ul-Configuration-r14 are configured without PUSCH / PUCCH. If the determination result of step 530 is yes, both Type-3 APH and Type-3 PH are reported in step 540. If the determination result of step 530 is no, it is determined in step 550 whether an additional SRS is configured for the SCell with PUSCH / PUCCH. If the determination result of step 550 is yes, both Type-3 APH and Type-1 PH are reported in step 560. If the judgment result of step 550 is no, then in step 570, it is determined whether additional SRS is not configured but ul-Configuration-r14 (no PUSCH / PUCCH) is configured. If the judgment result of step 570 is yes, then in step 580, Type-3 PH is reported. If the judgment result of step 570 is no, then in step 590, Type-1 PH is reported.

[0089] Table 3 summarizes Rule 3.

[0090] Attach SR ul-Configuration-r14 PUSCH / PUCCH PH to be reported Configuration Configuration Configuration Type-3A and Type-1 Configuration Configuration Not configured Type-3A and Type-3 Configuration Not configured Configuration Type-3A and Type-1 Configuration Not configured Not configured Type-3A Not configured Configuration Configuration Type-1 Not configured Configuration Not configured Type-3 Not configured Not configured Configuration Type-1

[0091] Figure 6An example of the enhanced extended PHR MAC CE format according to the third embodiment is shown, in which Rule 3 is adopted.

[0092] exist Figure 6 In the example shown, 32 serving cells are configured for uplink transmission, one serving cell is the PCell and the other thirty-one (31) serving cells are SCells. The PHR MAC CE is identified by a MAC PDU subheader with a dedicated LCID. It has a variable size.

[0093] Figure 6 The definitions of the fields included in the enhanced extended PHR MAC CE shown are basically the same as those in reference Figure 2 Same as described.

[0094] The first four octets indicate the presence of PH for each SCell.

[0095] When Type-2PH is reported for PCell, the next octet contains the "P" field, the "V" field, and the Type-2PH field. When the "V" field in this octet is set to "0", the next octet contains the "P" field, the "V" field, and the Type-2PH field. CMAX,c " field is used to calculate the previous PH field (i.e., Type-2PH field).

[0096] The next octet contains the "P" field, "V" field, and Type-1 PH field of the PCell. If the "V" field in this octet is set to 0, the next octet contains the "P" field, the "V" field, and the Type-1 PH field of the PCell. CMAX,c " field is used to calculate the previous PH field (i.e., Type-1 PH field).

[0097] The next octet is the Type-x PH field for the SCell and the associated P CMAX,c Fields (if reported), in ascending order based on ServCellIndex (provided that the associated C i field is set to 1).

[0098] According to the third embodiment, when an additional SRS is configured for the SCell without ul-Configuration-r14 and PUSCH / PUCCH, x is equal to 3A.

[0099] When both additional SRS and ul-Configuration-r14 are configured for the SCell without PUSCH / PUCCH, x has two values, where x1 is equal to 3A and x2 is equal to 3. That is, two octets are required to report two PHs.

[0100] Similarly, when additional SRS is configured for the SCell with PUSCH / PUCCH, x has two values, where x1 is equal to 3A and x2 is equal to 1.

[0101] When additional SRS is not configured but ul-Configuration-r14 (without PUSCH / PUCCH) is configured, x is equal to 3.

[0102] For other cases, x is equal to 1. That is, PUSCH / PUCCH is configured, but no additional SRS is configured.

[0103] According to the additional SRS of an SCell and the configuration of ul-Configuration-r14, when two PH values ​​are reported (for example, Type-3A and Type-3 or Type-3A and Type-1), at most one associated PH value can be reported for the SCell. CMAX,c If one of the two V values ​​is equal to 0, then the P associated with the reported PH of V=0 is presented. CMAX,c If both V values ​​for both PHs are equal to 0, then the P associated with the reported PH with V=0 is presented. CMAX,c If both V values ​​of two PHs are equal to 1, the associated P CMAX,c The octet of the field.

[0104] Figure 7 is a schematic flow chart illustrating an embodiment of a method 700 for power headroom reporting of additional SRS. In some embodiments, the method 700 is performed by a device such as a base station unit. In a specific embodiment, 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 702 configuring the UE for uplink transmission with the LAA SCell. The method 700 may also include 704 receiving a report on a power headroom (PH) for an additional SRS, wherein the report includes at least one of a PH calculated based on the additional SRS, a Type-3 PH, and a Type-1 PH. The above tables 1-3 indicate detailed implementations of the reported PH. Incidentally, the PH calculated based on the additional SRS is referred to as a Type-3 APH.

[0106] Figure 88 is a schematic flow chart illustrating another embodiment of a method 800 for power headroom reporting of an additional SRS. In some embodiments, the method 800 is performed by a device such as a remote unit or a UE. In a specific embodiment, the method 800 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.

[0107] The method 800 may include, if SRS is transmitted on the additional SRS symbol in the normal subframe, calculating a power headroom (PH) according to the additional SRS at 802; and reporting, by the MAC CE at 804, at least one of the PH calculated according to the additional SRS, the Type-3 PH, and the Type-1 PH. The above-mentioned Tables 1-3 indicate the detailed implementation of the reported PH. By the way, the PH calculated according to the additional SRS is called Type-3 APH.

[0108] Fig. 9 is a schematic block diagram showing an apparatus according to one embodiment.

[0109] refer to Fig. 9 , UE (ie remote unit) includes a processor, a memory and a transceiver. Processor implementation Figure 8 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 implements Figure 7 The functions, processes and / or methods proposed in the present invention are described in detail. The radio interface protocol layer can be implemented by a processor. The memory is connected to the processor to store various information fragments for driving the processor. The transceiver is connected to the processor to transmit and / or receive radio signals. Needless to say, the transceiver can be implemented as a transmitter for transmitting radio signals and a receiver for receiving radio signals.

[0110] The memory may be located inside or outside the processor and connected to the processor through various well-known means.

[0111] In the above-described embodiments, the components and features of the embodiments are combined in a predetermined form. Unless otherwise clearly stated, each component or feature should be considered as an option. Each component or feature can be implemented as not being associated with other components or features. In addition, the embodiment can be configured by associating some components and / or features. The order of operations described in this embodiment can change. Some components or features of any embodiment may be included in another embodiment, or replaced with components and features corresponding to another embodiment. Obviously, claims that are not clearly cited in the claims are combined to form embodiments or are included in new claims.

[0112] The embodiments may be implemented by hardware, firmware, software or a combination thereof. In the case of 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., depending on the implementation.

[0113] Embodiments may be practiced in other specific forms. The described embodiments are to be considered in all respects as merely illustrative and not restrictive. Therefore, the scope of the present invention is indicated by the appended claims rather than by the above description. All changes within the meaning and scope of the equivalence of the claims will be included within their scope.

Claims

1. A method at a UE, comprising: If an SRS is transmitted on an additional SRS symbol in a normal subframe, calculating a power headroom (PH) based on the additional SRS; as well as At least one of the PH calculated according to the additional SRS, the Type-3 PH and the Type-1 PH is reported by the MAC CE, If an additional SRS is configured for the SCell in the absence of PUSCH / PUCCH, a PH calculated based on the additional SRS is reported for the SCell. If ul-Configuration-r14 is configured for an SCell, Type-3 PH is reported for this SCell, and If PUSCH / PUCCH is configured, Type-1 PH is reported for SCell.

2. The method according to claim 1, wherein: configuring the UE with the LAA SCell for uplink transmission, The method further includes: receiving a PDCCH or an EPDCCH to schedule aperiodic SRS transmission on the additional SRS symbol on the LAA SCell in subframe i, In which, regardless of whether the UE can access the LAA SCell for the additional SRS transmission in subframe i, it is assumed that the UE performs non-periodic additional SRS transmission on the LAA SCell in subframe i to calculate the power margin based on the additional SRS for subframe i.

3. The method according to claim 1, wherein: If no additional SRS is configured for the SCell but ul-Configuration-r14 is configured, Type-3 PH is reported for this SCell, and If ul-Configuration-r14 is not configured for an SCell but an additional SRS is configured without PUSCH / PUCCH, the PH calculated based on the additional SRS is reported for this SCell.

4. The method according to claim 1, wherein: If there is no PUSCH / PUCCH If an additional SRS is configured for the SCell without ul-Configuration-r14, the PH calculated based on the additional SRS is reported for this SCell. If both additional SRS and ul-Configuration-r14 are configured for an SCell without PUSCH / PUCCH, both Type-3 PH and PH calculated based on the additional SRS are reported for this SCell. If an additional SRS is configured for an SCell with PUSCH / PUCCH, both the PH calculated from the additional SRS and the Type-1 PH are reported for this SCell, and If no additional SRS is configured for a SCell but PUSCH / PUCCH is configured, Type-1 PH is reported for this SCell.

5. The method according to claim 4, wherein: When two PH values ​​are reported for one SCell, at most one associated P value is reported for one or both PH values. CMAX ,c field.

6. The method according to claim 1, wherein: If the UE transmits an additional SRS in a normal subframe i for a serving cell c having a frame structure of Type-1 and / or Type-2 and / or Type-3, PH type3A，c (i) = P CMAX，c (i)-{10log 10 (M Additional_SRS,c )+P O_Additional__SRS，c +α Additional_SRS，c ·PL c +f Additional_SRS，c (i)} to calculate the PH calculated based on the additional SRS; as well as If the UE does not actually transmit the additional SRS, then To calculate the PH calculated according to the additional SRS, in, P CMAX，c (i) is the configured UE maximum transmit power in subframe i for serving cell c, P O_Additional_SRS，c It is the component P configured by the higher layer parameters p0-Nominal-additionalSRS and p0-UE-additionalSRS for additional SRS. O_Additional_Normal_SRS，c and component P O_UE_Additional_SRS，c The parameters of and composition, M Additional_SRS，c is the bandwidth for the additional SRS transmission in subframe i of serving cell c, expressed in the number of RBs, α Additional_SRS，c is the value of the higher layer parameter alpha-additionalSRS configured by higher layers for serving cell c, PL c is the downlink path loss estimate calculated in the UE for serving cell c, in dB, f Additional_SRS，c (i) the current SRS power control adjustment state determined by the TPC command carried by DCI format 3 / 3A / 3B, and Assuming SRS transmission in subframe i, and assuming maximum power reduction MPR = 0 dB, additional maximum power reduction A-MPR = 0 dB, power management maximum power reduction P-MPR = 0 dB and TC = 0 dB, calculate 7. A UE, comprising: a processor configured to: calculate a power headroom (PH) based on the additional SRS if the SRS is transmitted on the additional SRS symbol in a normal subframe; as well as a transmitter, the transmitter being configured to: report, by a MAC CE, at least one of a PH calculated according to the additional SRS, a Type-3 PH, and a Type-1 PH, If an additional SRS is configured for the SCell in the absence of PUSCH / PUCCH, a PH calculated based on the additional SRS is reported for the SCell. If ul-Configuration-r14 is configured for an SCell, Type-3 PH is reported for this SCell, and If PUSCH / PUCCH is configured, Type-1 PH is reported for SCell.

8. The UE according to claim 7, wherein: configuring the UE with the LAA SCell for uplink transmission, The UE further comprises a receiver configured to: receive a PDCCH or an EPDCCH to schedule aperiodic SRS transmission on the additional SRS symbol on the LAA SCell in subframe i, In which, regardless of whether the UE can access the LAA SCell for the additional SRS transmission in subframe i, it is assumed that the UE performs non-periodic additional SRS transmission on the LAA SCell in subframe i to calculate the power margin based on the additional SRS for subframe i.

9. The UE according to claim 7, wherein: If no additional SRS is configured for the SCell but ul-Configuration-r14 is configured, Type-3 PH is reported for this SCell, and If ul-Configuration-r14 is not configured for an SCell but an additional SRS is configured without PUSCH / PUCCH, the PH calculated based on the additional SRS is reported for this SCell.

10. The UE according to claim 7, wherein: If an additional SRS is configured for the SCell without PUSCH / PUCCH and ul-Configuration-r14, the PH calculated based on the additional SRS is reported for this SCell. If both additional SRS and ul-Configuration-r14 are configured for an SCell without PUSCH / PUCCH, both Type-3 PH and PH calculated based on the additional SRS are reported for this SCell. If an additional SRS is configured for an SCell with PUSCH / PUCCH, both the PH calculated from the additional SRS and the Type-1 PH are reported for this SCell, and If no additional SRS is configured for a SCell but PUSCH / PUCCH is configured, Type-1 PH is reported for this SCell.

11. The UE according to claim 10, wherein: When two PH values ​​are reported for one SCell, at most one associated P value is reported for one or both PH values. CMAX,c field.

12. The UE according to claim 7, wherein: If the UE transmits an additional SRS in a normal subframe i for a serving cell c having a frame structure of Type-1 and / or Type-2 and / or Type-3, PH type3A，c (i) = P CMAX，c (i)-{10log 10 (M Additional_SRS，c )+P O_Additional_SRS，c +α Additional_SRS,c ·PL c +f Additional_SRS,c (i)} to calculate the PH calculated based on the additional SRS; as well as If the UE does not actually transmit the additional SRS, then To calculate the PH calculated according to the additional SRS, in, P CMAX，c (i) is the configured UE maximum transmit power in subframe i for serving cell c, P O_Additional_SRS，c It is the component P configured by the higher layer parameters p0-Nominal-additionalSRS and p0-UE-additionalSRS for additional SRS. O_Additional_Normal_SRS，c and component P O_UE_Additional_SRS，c The parameters of and composition, M Additional_SRS，c is the bandwidth for the additional SRS transmission in subframe i of serving cell c, expressed in the number of RBs, α Additional_SRS，c is the value of the higher layer parameter alpha-additionalSRS configured by higher layers for serving cell c, PL c is the downlink path loss estimate calculated in the UE for serving cell c, in dB, f Additional_SRS，c (i) the current SRS power control adjustment state determined by the TPC command carried by DCI format 3 / 3A / 3B, and Assuming SRS transmission in subframe i, and assuming maximum power reduction MPR = 0 dB, additional maximum power reduction A-MPR = 0 dB, power management maximum power reduction P-MPR = 0 dB and TC = 0 dB, calculate 13. A method at a base station unit, comprising: Configure the UE with the LAA SCell for uplink transmission; as well as receiving a report on a power headroom (PH) of an additional SRS, wherein the report includes at least one of a PH calculated based on the additional SRS, a Type-3 PH, and a Type-1 PH, Wherein, if an additional SRS is configured for the SCell in the absence of PUSCH / PUCCH, the report includes the PH calculated according to the additional SRS for this SCell, If ul-Configuration-r14 is configured for the SCell, the report includes Type-3PH for this SCell, and If PUSCH / PUCCH is configured, the report includes Type-1 PH for SCell.

14. The method according to claim 13, further comprising: The PDCCH or EPDCCH is transmitted to schedule the aperiodic SRS transmission on the additional SRS symbol on the LAASCell in subframe i.

15. The method according to claim 13, wherein: If no additional SRS is configured for the SCell but ul-Configuration-r14 is configured, the report includes the Type-3 PH for this SCell, and If ul-Configuration-r14 is not configured for a SCell but an additional SRS is configured without PUSCH / PUCCH, the report includes the PH calculated based on the additional SRS for this SCell.

16. The method according to claim 13, wherein: If an additional SRS is configured for the SCell without PUSCH / PUCCH and ul-Configuration-r14, the report includes the PH calculated based on the additional SRS for this SCell, If both additional SRS and ul-Configuration-r14 are configured for SCell without PUSCH / PUCCH, the report includes both Type-3 PH for this SCell and PH calculated based on the additional SRS, If an additional SRS is configured for a SCell with PUSCH / PUCCH, the report includes both the PH calculated from the additional SRS and the Type-1 PH for this SCell, and If no additional SRS is configured for the SCell but PUSCH / PUCCH is configured, the report includes the Type-1 PH for this SCell.

17. The method according to claim 16, wherein: When the report includes two PH values ​​for one SCell, the report includes at most one associated PH value for one or both PH values. CMAX,c field.

18. A base station unit, comprising: a processor configured to configure the UE with the LAA SCell for uplink transmission; as well as a receiver configured to receive a report on a power headroom (PH) of an additional SRS, wherein the report includes at least one of a PH calculated based on the additional SRS, a Type-3 PH, and a Type-1 PH, Wherein, if an additional SRS is configured for the SCell in the absence of PUSCH / PUCCH, the report includes the PH calculated according to the additional SRS for this SCell, If ul-Configuration-r14 is configured for the SCell, the report includes Type-3PH for this SCell, and If PUSCH / PUCCH is configured, the report includes Type-1 PH for SCell.

19. The base station unit of claim 18, further comprising a transmitter configured to transmit a PDCCH or an EPDCCH to schedule aperiodic SRS transmission on the additional SRS symbol on the LAA SCell in subframe i.

20. The base station unit of claim 18, wherein: If no additional SRS is configured for the SCell but ul-Configuration-r14 is configured, the report includes the Type-3 PH for this SCell, and If ul-Configuration-r14 is not configured for a SCell but an additional SRS is configured without PUSCH / PUCCH, the report includes the PH calculated based on the additional SRS for this SCell.

21. The base station unit of claim 18, wherein: If an additional SRS is configured for the SCell without PUSCH / PUCCH and ul-Configuration-r14, the report includes the PH calculated based on the additional SRS for this SCell, If both additional SRS and ul-Configuration-r14 are configured for SCell without PUSCH / PUCCH, the report includes both Type-3 PH for this SCell and PH calculated based on the additional SRS, If an additional SRS is configured for a SCell with PUSCH / PUCCH, the report includes both the PH calculated from the additional SRS and the Type-1 PH for this SCell, and If no additional SRS is configured for the SCell but PUSCH / PUCCH is configured, the report includes the Type-1 PH for this SCell.

22. The base station unit of claim 21, wherein: When the report includes two PH values ​​for one SCell, the report includes at most one associated PH value for one or both PH values. CMAX,c field.

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