Systems and methods for determining downlink transmission power
The method addresses the challenge of accurately determining downlink transmission power in non-terrestrial networks by using power gaps and offsets indicated through DCI, MAC CE, and RRC signaling, enhancing decoding performance and service quality.
Patent Information
- Application Number
- PCT/CN2024/090712
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-07-31
AI Technical Summary
Existing wireless communication systems face challenges in accurately determining downlink transmission power for synchronization signal blocks and system information blocks in non-terrestrial networks and networks with network-controlled repeaters, leading to incorrect path loss estimation and decoding performance degradation.
A method for determining downlink transmission power by indicating transmission power gaps and offsets between synchronization signal blocks and other channels using DCI, MAC CE, RRC signaling, and user equipment-specific signaling, along with power compensation factors based on elevation angles and quasi-co-location relationships.
Enables accurate estimation of downlink transmission power, improving decoding performance and ensuring consistent service quality across different footprints in non-terrestrial networks and networks with network-controlled repeaters.
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Figure CN2024090712_31072025_PF_FP_ABST
Abstract
Description
SYSTEMS AND METHODS FOR DETERMINING DOWNLINK TRANSMISSION POWERTECHNICAL FIELD
[0001] The disclosure relates generally to wireless communications, including but not limited to systems and methods for determining downlink (DL) transmission power.BACKGROUND
[0002] The standardization organization Third Generation Partnership Project (3GPP) is currently in the process of specifying a new Radio Interface called 5G New Radio (5G NR) as well as a Next Generation Packet Core Network (NG-CN or NGC) . The 5G NR will have three main components: a 5G Access Network (5G-AN) , a 5G Core Network (5GC) , and a User Equipment (UE) . In order to facilitate the enablement of different data services and requirements, the elements of the 5GC, also called Network Functions, have been simplified with some of them being software based, and some being hardware based, so that they could be adapted according to need. Communication via satellite is one of the typical scenarios of the non-terrestrial networks in 3GPP standardization. In addition, connectivity via satellites and / or airborne vehicles is also extensively studied as one of 6G access technologies.SUMMARY
[0003] The example embodiments disclosed herein are directed to solving the issues relating to one or more of the problems presented in the prior art, as well as providing additional features that will become readily apparent by reference to the following detailed description when taken in conjunction with the accompany drawings. In accordance with various embodiments, example systems, methods, devices and computer program products are disclosed herein. It is understood, however, that these embodiments are presented by way of example and are not limiting, and it will be apparent to those of ordinary skill in the art who read the present disclosure that various modifications to the disclosed embodiments can be made while remaining within the scope of this disclosure.
[0004] At least one aspect is directed to a system, method, apparatus, or a computer-readable medium of the following. A wireless communication device (e.g., a user equipment (UE) ) may determine information regarding a DL transmission power for a DL transmission. The DL transmission is to be from a wireless communication node to the wireless communication device. In certain embodiments, the wireless communication device may perform reception of a DL transmission from a wireless communication node (e.g., a base station (BS) ) according to the determined information.
[0005] In some embodiments, the information regarding DL transmission power may comprise at least one of: a transmission power gap between a system information block type 1 (SIB1) (e.g., a SIB1 transmission / signaling) and a corresponding synchronization signal block (SSB) (e.g., a SSB transmission / signaling) ; a transmission power gap between a system information block type x (SIBx) (e.g., a SIBx transmission / signaling) , where x is a positive integer value and a corresponding SSB; a transmission power (e.g., an absolute transmission power) of the SIB1 or the SIBx; a predefined transmission power gap; a flag for enabling the transmission power gap; an offset of an energy per resource element (EPRE) between a target reference signal (RS) and a corresponding source RS, wherein the offset is an absolute value or an index; a predefined EPRE offset; a flag for enabling the predefined EPRE offset; a transmission power of an SSB (e.g., an ss-PBCH-BlockPower for a SSB) ; a list of power compensation factors associated with one or more elevation angles; a transmission power gap between a cell defining (CD) SSB and one or more non cell defining (NCD) SSBs, wherein the transmission power gap is an absolute value or an index; or a transmission power (e.g., an absolute transmission power) of one or more NCD SSBs.
[0006] In some embodiments, the DL transmission may comprise at least one of: a system information block type 1 (SIB1) (e.g., a SIB1 transmission / signaling) ; a system information block type x (SIBx) where x is a positive integer value; a demodulation reference signal (DM-RS); a physical downlink shared channel (PDSCH) transmission; a physical downlink control channel (PDCCH) transmission; a channel state information reference signal (CSI-RS) ; a tracking reference signal (TRS) ; a cell defining (CD) synchronization signal block (SSB) (e.g., SSB transmission / signaling) ; or a non cell defining (NCD) SSB.
[0007] In some embodiments, if the DL transmission comprises the SIB1, the information regarding the DL transmission power can be indicated in a corresponding PDCCH transmission (e.g., Type0-PDCCH) . In some embodiments, the wireless communication device may determine whether a field is present according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device. In some embodiments, the wireless communication device may determine whether a field is present according to an indication in a master information block (MIB) .
[0008] In some embodiments, if the DL transmission comprises the SIB1, the information regarding the DL transmission power can be indicated by an aggregation level (AL) of a corresponding PDCCH transmission (e.g., Type0-PDCCH’s AL) . In some embodiments, the wireless communication device may determine the information regarding the DL transmission power according to a mapping or a rule corresponding to the aggregation level.
[0009] In some embodiments, if the DL transmission comprises the SIBx, the information regarding the DL transmission power can be indicated in a corresponding PDCCH transmission or by an aggregation level of the corresponding PDCCH transmission (e.g., Type0A-PDCCH’s AL) . In some embodiments, if the DL transmission comprises the SIB1 or the SIBx, the information regarding the DL transmission power can be indicated in a master information block (MIB) .
[0010] In some embodiments, if the DL transmission comprises the DM-RS, the PDSCH, the CSI-RS, or the TRS, the information regarding the DL transmission power can be indicated by a downlink control information (DCI) signaling. In certain embodiments, the CSI-RS or the TRS can be aperiodic. In some embodiments, if the DL transmission comprises the DM-RS, the PDCCH, the CSI-RS, or the TRS, the information regarding the DL transmission power can be indicated by a medium access control control element (MAC CE) signaling. In certain embodiments, the CSI-RS or the TRS can be semi-persistent. In some embodiments, if the DL transmission comprises the CSI-RS or the TRS, the information regarding the DL transmission power can be indicated by a radio resource control (RRC) signaling. In certain embodiments, the CSI-RS or the TRS can be periodic.
[0011] In some embodiments, if the DL transmission comprises the CD SSB, the information regarding the DL transmission power can be indicated by a transmission power of an SSB (e.g., ss-PBCH-BlockPower) in each SIB1. A value of the transmission power of the SSB (e.g., ss-PBCH-BlockPower) can be different among multiple SIB1s. In some embodiments, if the DL transmission comprises the CD SSB, the information regarding the DL transmission power can be determined by wireless communication device according to a list of power compensation factors associated with one or more elevation angles. In some embodiments, if the DL transmission comprises the CD SSB or the NCD SSB, the information regarding the DL transmission power can be indicated by system information or a user equipment (UE) specific signaling.
[0012] In some embodiments, a wireless communication node (e.g., a base station (BS) ) may transmit a downlink (DL) transmission to a wireless communication device (e.g., a user equipment (UE) ) . The wireless communication device may determine information regarding a DL transmission power for the DL transmission.BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Various example embodiments of the present solution are described in detail below with reference to the following figures or drawings. The drawings are provided for purposes of illustration only and merely depict example embodiments of the present solution to facilitate the reader's understanding of the present solution. Therefore, the drawings should not be considered limiting of the breadth, scope, or applicability of the present solution. It should be noted that for clarity and ease of illustration, these drawings are not necessarily drawn to scale.
[0014] FIG. 1 illustrates an example cellular communication network in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure;
[0015] FIG. 2 illustrates a block diagram of an example base station and a user equipment device, in accordance with some embodiments of the present disclosure;
[0016] FIG. 3 illustrates an example framework for determining downlink (DL) transmission power, in accordance with some embodiments of the present disclosure;
[0017] FIG. 4 illustrates an example format for indicating downlink (DL) transmission power, in accordance with some embodiments of the present disclosure; and
[0018] FIG. 5 illustrates a flow diagram of an example method for determining downlink (DL) transmission power, in accordance with an embodiment of the present disclosure.DETAILED DESCRIPTION
[0019] 1. Mobile Communication Technology and Environment
[0020] FIG. 1 illustrates an example wireless communication network, and / or system, 100 in which techniques disclosed herein may be implemented, in accordance with an embodiment of the present disclosure. In the following discussion, the wireless communication network 100 may be any wireless network, such as a cellular network or a narrowband Internet of things (NB-IoT) network, and is herein referred to as “network 100. ” Such an example network 100 includes a base station 102 (hereinafter “BS 102” ; also referred to as wireless communication node) and a user equipment device 104 (hereinafter “UE 104” ; also referred to as wireless communication device) that can communicate with each other via a communication link 110 (e.g., a wireless communication channel) , and a cluster of cells 126, 130, 132, 134, 136, 138 and 140 overlaying a geographical area 101. In Figure 1, the BS 102 and UE 104 are contained within a respective geographic boundary of cell 126. Each of the other cells 130, 132, 134, 136, 138 and 140 may include at least one base station operating at its allocated bandwidth to provide adequate radio coverage to its intended users.
[0021] For example, the BS 102 may operate at an allocated channel transmission bandwidth to provide adequate coverage to the UE 104. The BS 102 and the UE 104 may communicate via a downlink radio frame 118, and an uplink radio frame 124 respectively. Each radio frame 118 / 124 may be further divided into sub-frames 120 / 127 which may include data symbols 122 / 128. In the present disclosure, the BS 102 and UE 104 are described herein as non-limiting examples of “communication nodes, ” generally, which can practice the methods disclosed herein. Such communication nodes may be capable of wireless and / or wired communications, in accordance with various embodiments of the present solution.
[0022] FIG. 2 illustrates a block diagram of an example wireless communication system 200 for transmitting and receiving wireless communication signals (e.g., OFDM / OFDMA signals) in accordance with some embodiments of the present solution. The system 200 may include components and elements configured to support known or conventional operating features that need not be described in detail herein. In one illustrative embodiment, system 200 can be used to communicate (e.g., transmit and receive) data symbols in a wireless communication environment such as the wireless communication environment 100 of Figure 1, as described above.
[0023] System 200 generally includes a base station 202 (hereinafter “BS 202” ) and a user equipment device 204 (hereinafter “UE 204” ) . The BS 202 includes a BS (base station) transceiver module 210, a BS antenna 212, a BS processor module 214, a BS memory module 216, and a network communication module 218, each module being coupled and interconnected with one another as necessary via a data communication bus 220. The UE 204 includes a UE (user equipment) transceiver module 230, a UE antenna 232, a UE memory module 234, and a UE processor module 236, each module being coupled and interconnected with one another as necessary via a data communication bus 240. The BS 202 communicates with the UE 204 via a communication channel 250, which can be any wireless channel or other medium suitable for transmission of data as described herein.
[0024] As would be understood by persons of ordinary skill in the art, system 200 may further include any number of modules other than the modules shown in Figure 2. Those skilled in the art will understand that the various illustrative blocks, modules, circuits, and processing logic described in connection with the embodiments disclosed herein may be implemented in hardware, computer-readable software, firmware, or any practical combination thereof. To clearly illustrate this interchangeability and compatibility of hardware, firmware, and software, various illustrative components, blocks, modules, circuits, and steps are described generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware, or software can depend upon the particular application and design constraints imposed on the overall system. Those familiar with the concepts described herein may implement such functionality in a suitable manner for each particular application, but such implementation decisions should not be interpreted as limiting the scope of the present disclosure.
[0025] In accordance with some embodiments, the UE transceiver 230 may be referred to herein as an "uplink" transceiver 230 that includes a radio frequency (RF) transmitter and a RF receiver each comprising circuitry that is coupled to the antenna 232. A duplex switch (not shown) may alternatively couple the uplink transmitter or receiver to the uplink antenna in time duplex fashion. Similarly, in accordance with some embodiments, the BS transceiver 210 may be referred to herein as a "downlink" transceiver 210 that includes a RF transmitter and a RF receiver each comprising circuity that is coupled to the antenna 212. A downlink duplex switch may alternatively couple the downlink transmitter or receiver to the downlink antenna 212 in time duplex fashion. The operations of the two transceiver modules 210 and 230 may be coordinated in time such that the uplink receiver circuitry is coupled to the uplink antenna 232 for reception of transmissions over the wireless transmission link 250 at the same time that the downlink transmitter is coupled to the downlink antenna 212. Conversely, the operations of the two transceivers 210 and 230 may be coordinated in time such that the downlink receiver is coupled to the downlink antenna 212 for reception of transmissions over the wireless transmission link 250 at the same time that the uplink transmitter is coupled to the uplink antenna 232. In some embodiments, there is close time synchronization with a minimal guard time between changes in duplex direction.
[0026] The UE transceiver 230 and the base station transceiver 210 are configured to communicate via the wireless data communication link 250, and cooperate with a suitably configured RF antenna arrangement 212 / 232 that can support a particular wireless communication protocol and modulation scheme. In some illustrative embodiments, the UE transceiver 210 and the base station transceiver 210 are configured to support industry standards such as the Long Term Evolution (LTE) and emerging 5G standards, and the like. It is understood, however, that the present disclosure is not necessarily limited in application to a particular standard and associated protocols. Rather, the UE transceiver 230 and the base station transceiver 210 may be configured to support alternate, or additional, wireless data communication protocols, including future standards or variations thereof.
[0027] In accordance with various embodiments, the BS 202 may be an evolved node B (eNB) , a serving eNB, a target eNB, a femto station, or a pico station, for example. In some embodiments, the UE 204 may be embodied in various types of user devices such as a mobile phone, a smart phone, a personal digital assistant (PDA) , tablet, laptop computer, wearable computing device, etc. The processor modules 214 and 236 may be implemented, or realized, with a general purpose processor, a content addressable memory, a digital signal processor, an application specific integrated circuit, a field programmable gate array, any suitable programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof, designed to perform the functions described herein. In this manner, a processor may be realized as a microprocessor, a controller, a microcontroller, a state machine, or the like. A processor may also be implemented as a combination of computing devices, e.g., a combination of a digital signal processor and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a digital signal processor core, or any other such configuration.
[0028] Furthermore, the steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in firmware, in a software module executed by processor modules 214 and 236, respectively, or in any practical combination thereof. The memory modules 216 and 234 may be realized as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. In this regard, memory modules 216 and 234 may be coupled to the processor modules 210 and 230, respectively, such that the processors modules 210 and 230 can read information from, and write information to, memory modules 216 and 234, respectively. The memory modules 216 and 234 may also be integrated into their respective processor modules 210 and 230. In some embodiments, the memory modules 216 and 234 may each include a cache memory for storing temporary variables or other intermediate information during execution of instructions to be executed by processor modules 210 and 230, respectively. Memory modules 216 and 234 may also each include non-volatile memory for storing instructions to be executed by the processor modules 210 and 230, respectively.
[0029] The network communication module 218 generally represents the hardware, software, firmware, processing logic, and / or other components of the base station 202 that enable bi-directional communication between base station transceiver 210 and other network components and communication nodes configured to communication with the base station 202. For example, network communication module 218 may be configured to support internet or WiMAX traffic. In a typical deployment, without limitation, network communication module 218 provides an 802.3 Ethernet interface such that base station transceiver 210 can communicate with a conventional Ethernet based computer network. In this manner, the network communication module 218 may include a physical interface for connection to the computer network (e.g., Mobile Switching Center (MSC) ) . The terms “configured for, ” “configured to” and conjugations thereof, as used herein with respect to a specified operation or function, refer to a device, component, circuit, structure, machine, signal, etc., that is physically constructed, programmed, formatted and / or arranged to perform the specified operation or function.
[0030] The Open Systems Interconnection (OSI) Model (referred to herein as, “open system interconnection model” ) is a conceptual and logical layout that defines network communication used by systems (e.g., wireless communication device, wireless communication node) open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below it. The OSI Model also defines a logical network and effectively describes computer packet transfer by using different layer protocols. The OSI Model may also be referred to as the seven-layer OSI Model or the seven-layer model. In some embodiments, a first layer may be a physical layer. In some embodiments, a second layer may be a Medium Access Control (MAC) layer. In some embodiments, a third layer may be a Radio Link Control (RLC) layer. In some embodiments, a fourth layer may be a Packet Data Convergence Protocol (PDCP) layer. In some embodiments, a fifth layer may be a Radio Resource Control (RRC) layer. In some embodiments, a sixth layer may be a Non Access Stratum (NAS) layer or an Internet Protocol (IP) layer, and the seventh layer being the other layer.
[0031] Various example embodiments of the present solution are described below with reference to the accompanying figures to enable a person of ordinary skill in the art to make and use the present solution. As would be apparent to those of ordinary skill in the art, after reading the present disclosure, various changes or modifications to the examples described herein can be made without departing from the scope of the present solution. Thus, the present solution is not limited to the example embodiments and applications described and illustrated herein. Additionally, the specific order or hierarchy of steps in the methods disclosed herein are merely example approaches. Based upon design preferences, the specific order or hierarchy of steps of the disclosed methods or processes can be re-arranged while remaining within the scope of the present solution. Thus, those of ordinary skill in the art will understand that the methods and techniques disclosed herein present various steps or acts in a sample order, and the present solution is not limited to the specific order or hierarchy presented unless expressly stated otherwise.
[0032] 2. Systems and Methods for Determining Downlink (DL) Transmission Power
[0033] A transmission power of a synchronization signal block (SSB) signaling / transmission can be indicated by ss-PBCH-BlockPower in a system information block type 1 (SIB1) signaling / transmission, which can be used by a user equipment (UE) to adjust an automatic gain control (AGC) factor of a receiver of the UE. The AGC factor can be used by the UE in following DL reception including at least other SSBs, Type0-PDCCH, and / or SIB1. In some special networks such as a non-terrestrial network (NTN) and a network with a network-controlled repeater (NCR) / reconfigurable intelligent surface (RIS) , the situation may be different.
[0034] 1. A transmission power of a SSB and a SIB1 / SIBx may be different: To reduce common channel overhead, the periodicity of SIB1 / SIBx may be different from that of SSB. For example, in an NTN, the periodicity for SSB, SIB1 and SIB19 can be 20ms, 160ms and 320ms, respectively. At the same time, the satellite may use dynamic power sharing among satellite beams or different satellite beam patterns / size (e.g., wide or narrow) across the satellite footprint. For another example, in a network with NCR / RIS, the NCR / RIS may only forward part of the DL common channels to reduce interference to other cells, which may result in different periodicity for SSB and / or SIB1 in different areas. The NCR / RIS (active) may carry out amplification in forwarding operation. As a result, the transmission power of SSB and SIB1 / SIBx may be different due to (1) varying power sharing for dynamic scheduled PDSCH or (2) active amplification of NCR / RIS. In such case, if the transmission power for SSB and SIB1 / SIBx is different, the AGC factor of a receiver of a UE may not be correct for SIB1 / SIBx reception and may lead to decoding performance degradation. Therefore, indicating extra information to a UE to facilitate determination of the SIB1 / SIBx transmission power can be performed. Similarly, the DL transmission power for other DL channels / signals may also be different from its quasi co-located (QCLed) DL reference signal (RS) , if the other DL channels / signals and QCLed DL RS are transmitted with different impact to dynamic power sharing.
[0035] 2. The transmission power of different SSBs may be different: For example, if multiple beam per cell is adopted in an NTN, a satellite may transmit different SSB to serve different footprint. Currently, the transmission power indication ss-PBCH-BlockPower in SIB1 can be the same for all SSBs. However, to provide similar service quality in different footprint, the BS may compensate the path loss and the steering loss with different EIRP per SSB. For example, the BS may use a larger effective isotropic radiated power (EIRP) for a footprint with smaller elevation angle (e.g., with larger path loss) , which may lead to different transmission power of different SSBs. In addition, grating lobe may exist if phased-array antenna is used at the satellite, the compensation of the BS can also impact the UE in the footprint illuminated by the grating lobe. For another example, in a network with NCR / RIS, the NCR / RIS (active) may carry out amplification in forwarding operation for better coverage performance. As a result, the UE cannot correctly estimate the path loss with the unknown BS’s compensation and / or NCR / RIS’s amplification. Therefore, the following UL transmission power cannot be correctly calculated at the UE side.
[0036] In the present disclosure, a method for DL transmission power determination is proposed. FIG. 3 illustrates an example framework for determining downlink (DL) transmission power, in accordance with some embodiments of the present disclosure.
[0037] In some embodiments, a transmission power indication (e.g., ss-PBCH-BlockPower) in a SIB1 (e.g., SIB1 transmission or SIB1 format) may indicate an average energy per resource element (EPRE) of resource elements that carry secondary synchronization signals in dBm that the network used for SSB transmission. The ss-PBCH-BlockPower value can be used for path loss estimation at the UE side.
[0038] A UE can be configured with a list of up to M transmission configuration indication (TCI) -state configurations within the higher layer parameter physical downlink shared channel (PDSCH) -Config to decode PDSCH according to a detected PDCCH with downlink control information (DCI) intended for the UE and the given serving cell, where M depends on the UE capability maxNumberConfiguredTCIstatesPerCC. Each TCI-state may include one or more parameters for configuring a quasi co-location relationship between one or two downlink reference signals and the demodulation reference signal (DM-RS) ports of PDSCH, the DM-RS port of physical downlink control channel (PDCCH) or the channel state information reference signal (CSI-RS) port (s) of a CSI-RS resource. The quasi co-location relationship can be configured by a higher layer parameter qcl-Type1 for a first DL RS, and qcl-Type2 for a second DL RS (if configured) . For the case of two DL RSs, in some embodiments, the QCL types cannot be the same, regardless of whether the references are to the same DL RS or different DL RSs. The quasi co-location types corresponding to each DL RS can be given by a higher layer parameter qcl-Type in QCL-Info and may take one of the following values:
[0039] - 'typeA' : {Doppler shift, Doppler spread, average delay, delay spread} ;
[0040] - 'typeB' : {Doppler shift, Doppler spread} ;
[0041] - 'typeC' : {Doppler shift, average delay} ; or
[0042] - 'typeD' : {Spatial Rx parameter} .
[0043] Implementation Example 1: How to determine DL transmission power difference between SSB and other DL common channel?
[0044] A wireless communication device (e.g., a user equipment (UE) ) may determine information regarding a DL transmission power for a DL transmission. In certain embodiments, the wireless communication device may perform reception of a DL transmission from a wireless communication node (e.g., a base station (BS) ) according to the determined information. In some embodiments, the information regarding DL transmission power may comprise at least one of:a transmission power gap between a system information block type 1 (SIB1) (e.g., a SIB1 transmission / signaling) and a corresponding synchronization signal block (SSB) (e.g., a SSB transmission / signaling) ; a transmission power gap between a system information block type x (SIBx) (e.g., a SIBx transmission / signaling) , where x is a positive integer value and a corresponding SSB; a transmission power (e.g., an absolute transmission power) of the SIB1 or the SIBx; a predefined transmission power gap; a flag for enabling the transmission power gap; an offset of an energy per resource element (EPRE) between a target reference signal (RS) and a corresponding source RS, wherein the offset is an absolute value or an index; a predefined EPRE offset; a flag for enabling the predefined EPRE offset; a transmission power of an SSB (e.g., an ss-PBCH-BlockPower for a SSB) ; a list of power compensation factors associated with one or more elevation angles; a transmission power gap between a cell defining (CD) SSB and one or more non cell defining (NCD) SSBs, wherein the transmission power gap is an absolute value or an index; or a transmission power (e.g., an absolute transmission power) of one or more NCD SSBs.
[0045] In some embodiments, the DL common channel / signal may at least include a system information block type 1 (SIB1) or a system information block type x (SIBx) where x is a positive integer value and a corresponding SSB. The SIB1 can be taken as an example in following method description.
[0046] Case 1-1: For SIB1, downlink transmission power can be indicated in Type0-PDCCH.
[0047] In some embodiments, if the DL transmission comprises the SIB1, the information regarding the DL transmission power can be indicated in a corresponding PDCCH transmission (e.g., Type0-PDCCH) . In some embodiments, if a different transmission power is used in a SIB1 transmission, the transmission power can be indicated in a corresponding PDCCH (e.g., Type0-PDCCH) of the SIB1.
[0048] a. A new field can be added in the DCI format 1_0 with cyclic redundancy check (CRC) scrambled by system information -radio network temporary identifier (SI-RNTI) .
[0049] b. How does a UE determine a presence of a new field?
[0050] a) In some embodiments, the wireless communication device may determine whether a field is present according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device. In some embodiments, the new field can be associated with a network / UE type. For example, the UE type can be a non-terrestrial network (NTN) UE, or a special terrestrial network UE in a dedicated network. For another example, the network to be accessed can be an NTN, which may be determined by the UE using global navigation satellite system (GNSS) information (e.g., the UE may determine itself is in an ocean or a desert) .
[0051] b) In some embodiments, the wireless communication device may determine whether a field is present according to an indication in a master information block (MIB) . In some embodiments, the new field can be indicated by an indication in a master information block (MIB) . For example, a bit flag can be added in a MIB. If the bit flag is set to 1, a UE may expect / plan for the presence of the new field. If the bit flag is set to 0, a UE may not expect / plan for the presence of the new field.
[0052] c. The content of the field can be at least one of following:
[0053] a) In some embodiments, the content of the field can be a transmission power gap between the SIB1 and a nearest corresponding SSB before the SIB1. The transmission power gap can be an absolute value, e.g., one of {-3dB, 0dB, 3dB} . The transmission power gap can be an index for a value in a predefined value set, e.g., the index “0” may mean / indicate -3dB in the set {-3dB, 0dB, 3dB} . The corresponding SSB can be the SSB associated with the Type0-PDCCH for the SIB1.
[0054] b) In some embodiments, the content (e.g., value) of the field can be an absolute transmission power of the SIB1.
[0055] c) In some embodiments, the content of the field can be a transmission power gap enable / disable flag for a predefined / configured transmission power gap. For example, a transmission power gap of -3dB can be configured or predefined. If the transmission power gap enable / disable flag is 1, the transmission power gap between the SIB1 and a nearest corresponding SSB before the SIB1 can be -3dB. If the transmission power gap enable / disable flag is 0, the transmission power gap between the SIB1 and a nearest corresponding SSB before the SIB1 can be 0dB, e.g., disabled.
[0056] Case 1-2: For SIB1, downlink transmission power can be indicated by Type0-PDCCH’s AL.
[0057] In some embodiments, if the DL transmission comprises the SIB1, the information regarding the DL transmission power can be indicated by an aggregation level (AL) of a corresponding PDCCH transmission (e.g., Type0-PDCCH’s AL) . In some embodiments, if different transmission power is used in a SIB1 transmission, the downlink transmission power can be indicated by aggregation level (AL) of corresponding PDCCH (e.g., Type0-PDCCH) . The Type0-PDCCH and corresponding SIB1 can be transmitted consecutively. It is reasonable to assume the same transmission power is used for a Type0-PDCCH and its corresponding SIB1. Therefore, if the transmission power is reduced, the Type0-PDCCH may use higher AL to guarantee reception performance.
[0058] a. In some embodiments, the wireless communication device may determine the information regarding the DL transmission power according to a mapping (e.g., mapping relationship / association) corresponding to the aggregation level. For example, the transmission power gap between the SIB1 and a nearest corresponding SSB before the SIB1 can be determined by a mapping (e.g., a one-to-one mapping) to the corresponding PDCCH’s AL. For example, for the AL of {1, 2, 4, 8, 16} , a predefined transmission power gap of {0, 0, 0, -3, -3} dB can be used.
[0059] b. In some embodiments, the wireless communication device may determine the information regarding the DL transmission power according to a rule corresponding to the aggregation level. The mapping can also be explained as a rule (e.g., an N-to-one mapping) , e.g., the AL ranges of {1, 2, 4} and {8, 16} can be mapped to the transmission power gap of 0dB and -3dB, respectively.
[0060] Case 1-3: For SIBx, downlink transmission power can be indicated in Type0A-PDCCH or by Type0A-PDCCH’s AL.
[0061] In some embodiments, if the DL transmission comprises the SIBx, the information regarding the DL transmission power can be indicated in a corresponding PDCCH transmission or by an aggregation level of the corresponding PDCCH transmission (e.g., Type0A-PDCCH’s AL) . In some embodiments, if different transmission power is used in SIBx transmission, the DL transmission power can be indicated using the method described above. The difference may include at least one of the following.
[0062] a. The PDCCH used can be Type0A-PDCCH instead of Type0-PDCCH.
[0063] b. How does a UE determine a presence of the new field in the DCI format 1_0 with CRC scrambled by SI-RNTI (e.g., Type0A-PDCCH) ?
[0064] a) The presence of the new field can be indicated by an indication in SIB1. For example, a bit flag can be added in SIB1. If the bit flag is set to 1, a UE may expect / plan for the presence of the new field. If the bit flag is set to 0, a UE may not expect / plan for the presence of the new field.
[0065] b) The presence of the new field can follow (e.g., be same as, indicated by) the SIB1’s new field indication. For example, as in Case 1-1, if a bit flag is added in the MIB and if the bit flag is set to 1, a UE may expect / plan for the presence of the new field in the DCI format 1_0 with CRC scrambled by SI-RNTI, which may schedule PDSCH carrying SIB1 and / or SIBx.
[0066] Case 1-4: For SIB1 and / or SIBx, downlink transmission power can be indicated in MIB.
[0067] In some embodiments, if the DL transmission comprises the SIB1 or the SIBx, the information regarding the DL transmission power can be indicated in a master information block (MIB) . In some embodiments, if a different transmission power is used in a SIB1 transmission, the downlink transmission power can be indicated in a MIB. For example, a bit flag can be added in a MIB, which may indicate enable / disable of a predefined / configured transmission power gap. For example, a transmission power gap of -3dB can be predefined / configured. If the bit flag is 1, the transmission power gap between the SI (e.g., SIB1 and / or SIBx) and a nearest corresponding SSB before the SI can be -3dB. If the bit flag is 0, the transmission power gap between the SI (e.g., SIB1 and / or SIBx) and a nearest corresponding SSB before the SI can be 0dB, e.g., disabled.
[0068] Implementation Example 2: How to determine EPRE difference between a source RS and a target RS?
[0069] A wireless communication device (e.g., a user equipment (UE) ) may determine information regarding a DL transmission power for a DL transmission. In certain embodiments, the wireless communication device may perform reception of a DL transmission from a wireless communication node (e.g., a base station (BS) ) according to the determined information. In some embodiments, the information regarding DL transmission power may comprise at least one of: a transmission power gap between a system information block type 1 (SIB1) (e.g., a SIB1 transmission / signaling) and a corresponding synchronization signal block (SSB) (e.g., a SSB transmission / signaling) ; a transmission power gap between a system information block type x (SIBx) (e.g., a SIBx transmission / signaling) , where x is a positive integer value and a corresponding SSB; a transmission power (e.g., an absolute transmission power) of the SIB1 or the SIBx; a predefined transmission power gap; a flag for enabling the transmission power gap; an offset of an energy per resource element (EPRE) between a target reference signal (RS) and a corresponding source RS, wherein the offset is an absolute value or an index; a predefined EPRE offset; a flag for enabling the predefined EPRE offset; a transmission power of an SSB (e.g., an ss-PBCH-BlockPower for a SSB) ; a list of power compensation factors associated with one or more elevation angles; a transmission power gap between a cell defining (CD) SSB and one or more non cell defining (NCD) SSBs, wherein the transmission power gap is an absolute value or an index; or a transmission power (e.g., an absolute transmission power) of one or more NCD SSBs.
[0070] In some embodiments, a source RS in a TCI-state may include at least one of: SSB or CSI-RS (may include TRS) . The target RS in a TCI-state may include at least one of: a DM-RS port of a PDSCH, a DM-RS port of PDCCH, or a CSI-RS port of a CSI-RS (may include TRS) resource. The PDSCH may include at least UE-specific data and / or UE-group data.
[0071] In a QCL type definition, there may be no indication about transmission gain. Therefore, a new rule can be added to the QCL definition, e.g., the transmission power (or the average EPRE) of the source RS and the target RS can be assumed as the same by a UE, if no other rules apply.
[0072] The QCL “typeD” may only be applicable for frequency band above 6GHz (e.g., FR2) , which may reflect the usage of spatial filter (e.g., analog and digital beamforming) in high frequency band. In a NTN, the spatial filter may be used in the frequency band below 6GHz (e.g., S band) . Therefore, the QCL “typeD” usage can be extended to the frequency band below 6GHz as well.
[0073] Case 2-1: The target RS can be the DM-RS ports of a PDSCH, or an aperiodic CSI-RS / TRS.
[0074] In some embodiments, if the DL transmission comprises the DM-RS, the PDSCH, the CSI-RS, or the TRS, the information regarding the DL transmission power can be indicated by a downlink control information (DCI) signaling. In certain embodiments, the CSI-RS or the TRS can be aperiodic. For example, a UE can be configured with a list of up to M TCI-state configurations within the higher layer parameter PDSCH-Config to decode PDSCH according to a detected PDCCH with DCI intended for the UE and a given serving cell.
[0075] If a PDSCH is transmitted using a transmission power different from its configured QCLed source RS, the DL transmission power can be indicated in its corresponding PDCCH (e.g., DCI format 1_0 or 1_1) .
[0076] a. If tci-PresentInDCI is omitted or the PDSCH is scheduled by DCI 1_0, a new field can be added in the DCI format 1_0 / 1_1 with CRC scrambled by C-RNTI / RA-RNTI / P-RNTI. The presence of the new field can be configured / indicated to the UE using a RRC parameter. The content of the field can be at least one of following.
[0077] a) The content of the field can be an EPRE offset between the PDSCH and the nearest QCLed source RS in the TCI-state for its corresponding PDCCH. (1) The EPRE offset can be an absolute value. The absolute EPRE offset value can be one value selected from a predefined or configured value set, e.g., one of {-3dB, 0dB, 3dB} . (2) The EPRE offset can be an index for a value in a predefined value set, e.g., the index “0” means -3dB in the set {-3dB, 0dB, 3dB} .
[0078] b) The content of the field can be an EPRE offset enable / disable flag for a predefined / configured EPRE offset. For example, a EPRE offset of -3dB can be configured or predefined. If the EPRE offset enable / disable flag is 1, the EPRE offset between the PDSCH and the nearest QCLed source RS in the TCI-State for its corresponding PDCCH can be -3dB. If the EPRE offset enable / disable flag is 0, the EPRE offset between the PDSCH and the nearest QCLed source RS in the TCI-State for its corresponding PDCCH can be 0dB, e.g., disabled.
[0079] b. If tci-PresentInDCI is enabled, new field can be added in the DCI format 1_1 with CRC scrambled by C-RNTI / RA-RNTI / P-RNTI. The presence of the new field can be configured to the UE using a RRC parameter. The content of the field can be at least one of following.
[0080] a) The content of the field can be an EPRE offset between the PDSCH and its QCLed source RS. (1) The EPRE offset can be an absolute value. The absolute EPRE offset value can be one value selected from a predefined or configured value set, e.g., one of {-3dB, 0dB, 3dB} . (2) The EPRE offset can be an index for a value in a predefined value set, e.g., the index “0” means -3dB in the set {-3dB, 0dB, 3dB} .
[0081] b) An EPRE offset enable / disable flag for a predefined EPRE offset. For example, a EPRE offset of -3dB can be configured or predefined. If the EPRE offset enable / disable flag is 1, the EPRE offset between the PDSCH and its QCLed source RS can be -3dB. If the EPRE offset enable / disable flag is 0, the EPRE offset between the PDSCH and its QCLed source RS can be 0dB, e.g., disabled.
[0082] Case 2-2: The target RS can be the DM-RS ports of a PDCCH, or a semi-persistent CSI-RS / TRS.
[0083] In some embodiments, if the DL transmission comprises the DM-RS, the PDCCH, the CSI-RS, or the TRS, the information regarding the DL transmission power can be indicated by a medium access control control element (MAC CE) signaling. In certain embodiments, the CSI-RS or the TRS can be semi-persistent.
[0084] FIG. 4 illustrates an example format for indicating downlink (DL) transmission power, in accordance with some embodiments of the present disclosure. In some embodiments, a new MAC CE (e.g., called EPRE offset for TCI MAC CE) can be used to indicate the EPRE offset between the target RS and its QCLed source RS. The format of the MAC CE can include at least one of:
[0085] Serving Cell ID: This field may indicate the identity of a serving cell for which the MAC CE applies.
[0086] CORESET ID: This field may indicate a control resource set identified with ControlResourceSetId, for which the TCI state can be being indicated.
[0087] TCI State ID: This field may indicate the TCI state identified by TCI-StateId applicable to the control resource set identified by CORESET ID field.
[0088] EPRE offset: This field may indicate the EPRE offset between the target RS and its QCLed source RS. The content of the field can be at least one of following.
[0089] a. The content (e.g., value) of the field can be / indicate an EPRE offset between the target RS and its QCLed source RS. (1) The EPRE offset can be an absolute value. The absolute EPRE offset value can be one value selected from a predefined or configured value set, e.g., one of {-3dB, 0dB, 3dB} . (2) The EPRE offset can be an index for a value in a predefined value set, e.g., the index “0” means -3dB in the set {-3dB, 0dB, 3dB} .
[0090] b. The content of the field can be / indicate an EPRE offset enable / disable flag for a predefined EPRE offset. For example, a EPRE offset of -3dB can be configured or predefined. If the EPRE offset enable / disable flag can be 1, the EPRE offset between the target RS and its QCLed source RS can be -3dB. If the EPRE offset enable / disable flag is 0, the EPRE offset between the target RS and its QCLed source RS can be 0dB, e.g., disabled.
[0091] In FIG. 4, compared with current “TCI State Indication for UE-specific PDCCH MAC CE” , the proposed “EPRE offset for TCI MAC CE” has a new field “EPRE offset” , e.g., Oct 3. Therefore, the “TCI State Indication for UE-specific PDCCH MAC CE” can be revised with the new field “EPRE offset” added.
[0092] Case 2-3: The target RS can be periodic CSI-RS / TRS.
[0093] In some embodiments, if the DL transmission comprises the CSI-RS or the TRS, the information regarding the DL transmission power can be indicated by a radio resource control (RRC) signaling. In certain embodiments, the CSI-RS or the TRS can be periodic. In some embodiments, in the RRC configuration of QCL information for periodic CSI-RS, a new field can be added to indicate the EPRE offset between the target RS and its QCLed source RS.
[0094] For example, a new field (e.g., qcl-RsEpreOffset) can be added in information element (IE) non-zero-power (NZP) -CSI-RS-resource to indicate the EPRE offset between the target RS and its QCLed source RS. The content of the field can be / include at least one of following.
[0095] a. The content of the field can be / include / indicate an EPRE offset between the target RS and its QCLed source RS. (1) The content of the field can be the EPRE offset can be an absolute value. The absolute EPRE offset value can be one value selected from a predefined or configured value set, e.g., one of {-3dB, 0dB, 3dB} . (2) The EPRE offset can be an index for a value in a predefined value set, e.g., the index “0” may mean / indicate -3dB in the set {-3dB, 0dB, 3dB} .
[0096] b. The content of the field can be / include / indicate an EPRE offset enable / disable flag for a predefined EPRE offset. For example, a EPRE offset of -3dB can be configured or predefined. If the EPRE offset enable / disable flag is 1, the EPRE offset between the target RS and its QCLed source RS can be -3dB. If the EPRE offset enable / disable flag is 0, the EPRE offset between the target RS and its QCLed source RS can be 0dB, e.g., disabled.
[0097] Implementation Example 3: How to determine DL transmission power difference between different SSBs?
[0098] A wireless communication device (e.g., a user equipment (UE) ) may determine information regarding a DL transmission power for a DL transmission. In certain embodiments, the wireless communication device may perform reception of a DL transmission from a wireless communication node (e.g., a base station (BS) ) according to the determined information. In some embodiments, the information regarding DL transmission power may comprise at least one of:a transmission power gap between a system information block type 1 (SIB1) (e.g., a SIB1 transmission / signaling) and a corresponding synchronization signal block (SSB) (e.g., a SSB transmission / signaling) ; a transmission power gap between a system information block type x (SIBx) (e.g., a SIBx transmission / signaling) , where x is a positive integer value and a corresponding SSB; a transmission power (e.g., an absolute transmission power) of the SIB1 or the SIBx; a predefined transmission power gap; a flag for enabling the transmission power gap; an offset of an energy per resource element (EPRE) between a target reference signal (RS) and a corresponding source RS, wherein the offset is an absolute value or an index; a predefined EPRE offset; a flag for enabling the predefined EPRE offset; a transmission power of an SSB (e.g., an ss-PBCH-BlockPower for a SSB) ; a list of power compensation factors associated with one or more elevation angles; a transmission power gap between a cell defining (CD) SSB and one or more non cell defining (NCD) SSBs, wherein the transmission power gap is an absolute value or an index; or a transmission power (e.g., an absolute transmission power) of one or more NCD SSBs.
[0099] Case 3-1: Power difference among CD-SSBs.
[0100] In some embodiments, the transmission power indication ss-PBCH-BlockPower in SIB1 can be the same for all SSBs. However, to provide similar service quality in different footprints, the BS may compensate the path loss and the steering loss with different EIRP per beam. The UE cannot accurately estimate the path loss with the unknown BS’s compensation. As a result, the following UL transmission power cannot be correctly calculated at the UE side. To solve this problem, at least one of following methods can be used.
[0101] a. In some embodiments, if the DL transmission comprises the CD SSB, the information regarding the DL transmission power can be indicated by a transmission power of an SSB (e.g., ss-PBCH-BlockPower) in each SIB1. A value of the transmission power of the SSB (e.g., ss-PBCH-BlockPower) can be different among multiple SIB1s. For example, the ss-PBCH-BlockPower in each SIB1 (e.g., SIB1 transmission) can be indicated according to the corresponding SSB (e.g., SSB transmission) , which can be different among all transmitted SSBs.
[0102] b. In some embodiments, if the DL transmission comprises the CD SSB, the information regarding the DL transmission power can be determined by wireless communication device according to a list of power compensation factors associated with one or more elevation angles. For example, a power compensation factor set can be predefined, which can be associated with elevation angles using a mapping table. To determine the elevation angle, a reference location (e.g., the center of a beam footprint) can be provided in system information (e.g., SIB19) . A UE may calculate the elevation angle using the reference location and the satellite location (e.g., obtained by ephemeris provided in SIB19) . To determine the elevation angle, the UE can also calculate the elevation angle using its GNSS location and the satellite location. The UE may determine the power compensation factor using the elevation angle according to the mapping table. The UE may determine the SSB transmission power as the sum of ss-PBCH-BlockPower and the power compensation factor. The mapping table for serving cell or neighboring cell (e.g., target cells for handover) can be provided to UEs in system information (e.g., SIB19) or via RRC message. The mapping table for different orbit height can be separately configured or predefined in specification. The UE may select / determine an applicable mapping table using the orbit height provided in system information (e.g., obtained by ephemeris provided in SIB19) . An example of the mapping table can be provided for LEO600.
[0103] Table 1. An example of mapping table for LEO600
[0104] c. In some embodiments, if the DL transmission comprises the CD SSB, the information regarding the DL transmission power can be indicated to wireless communication device via a user equipment (UE) specific signaling (e.g., RRC / MAC CE / DCI) . The CD SSB can be an SSB of the UE’s serving cell (e.g., for measurement) or an SSB of a neighboring cell (e.g., for handover) .
[0105] Case 3-2: Power difference between CD-SSB and NCD-SSB.
[0106] In some embodiments, if the DL transmission comprises the CD SSB or the NCD SSB, the information regarding the DL transmission power can be indicated by system information or a user equipment (UE) specific signaling. For example, the non cell defining (NCD) SSB may share the same ss-PBCH-BlockPower with CD SSB of the same cell. If the transmission power the CD SSB and NCD SSBs is different, the transmission power gap may be provided to UE to facilitate correct measurement using NCD SSBs. The transmission power gap can be indicated in system information (e.g., SIB1 or SIB19) . For RRC-CONNECTED UEs, the transmission power gap can be indicated via a UE-specific signaling (e.g., RRC / MAC CE / DCI) .
[0107] A new field can be added / defined in the system information or in the UE-specific signaling. The content of the field can be / indicate at least one of following.
[0108] a. The content of the field can be / indicate / include a transmission power gap between a CD SSB and a NCD SSBs. (1) The transmission power gap can be an absolute value. The absolute value can be one value selected from a predefined or configured value set, e.g., one of {-3dB, 0dB, 3dB} . (2) The transmission power gap can be an index for a value in a predefined value set, e.g., the index “0” means -3dB in the set {-3dB, 0dB, 3dB} .
[0109] b. The content of the field can be / indicate / include an absolute transmission power of the NCD SSBs.
[0110] It should be understood that one or more features from the above / following implementation examples are not exclusive to the specific implementation examples, but can be combined in any manner (e.g., in any priority and / or order, concurrently or otherwise) .
[0111] FIG. 5 illustrates a flow diagram of a method 500 for determining downlink (DL) transmission power. The method 500 may be implemented using any one or more of the components and devices detailed herein in conjunction with FIGs. 1–4. In overview, the method 500 may be performed by a UE, in some embodiments. Additional, fewer, or different operations may be performed in the method 500 depending on the embodiment. At least one aspect of the operations is directed to a system, method, apparatus, or a computer-readable medium.
[0112] A wireless communication device (e.g., a user equipment (UE) ) may determine information regarding a DL transmission power for a DL transmission. In certain embodiments, the wireless communication device may perform reception of a DL transmission from a wireless communication node (e.g., a base station (BS) ) according to the determined information.
[0113] In some embodiments, the information regarding DL transmission power may comprise at least one of: a transmission power gap between a system information block type 1 (SIB1) (e.g., a SIB1 transmission / signaling) and a corresponding synchronization signal block (SSB) (e.g., a SSB transmission / signaling) ; a transmission power gap between a system information block type x (SIBx) (e.g., a SIBx transmission / signaling) , where x is a positive integer value and a corresponding SSB; a transmission power (e.g., an absolute transmission power) of the SIB1 or the SIBx; a predefined transmission power gap; a flag for enabling the transmission power gap; an offset of an energy per resource element (EPRE) between a target reference signal (RS) and a corresponding source RS, wherein the offset is an absolute value or an index; a predefined EPRE offset; a flag for enabling the predefined EPRE offset; a transmission power of an SSB (e.g., an ss-PBCH-BlockPower for a SSB) ; a list of power compensation factors associated with one or more elevation angles; a transmission power gap between a cell defining (CD) SSB and one or more non cell defining (NCD) SSBs, wherein the transmission power gap is an absolute value or an index; or a transmission power (e.g., an absolute transmission power) of one or more NCD SSBs.
[0114] In some embodiments, the DL transmission may comprise at least one of: a system information block type 1 (SIB1) (e.g., SIB1 transmission / signaling) ; a system information block type x (SIBx) (e.g., SIBx transmission / signaling) where x is a positive integer value; a demodulation reference signal (DM-RS) ; a physical downlink shared channel (PDSCH) transmission; a physical downlink control channel (PDCCH) transmission; a channel state information reference signal (CSI-RS) ; a tracking reference signal (TRS) ; a cell defining (CD) synchronization signal block (SSB) (e.g., SSB transmission / signaling) ; or a non cell defining (NCD) SSB.
[0115] In some embodiments, if the DL transmission comprises the SIB1, the information regarding the DL transmission power can be indicated in a corresponding PDCCH transmission (e.g., Type0-PDCCH) . In some embodiments, the wireless communication device may determine whether a field is present according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device. In some embodiments, the wireless communication device may determine whether a field is present according to an indication in a master information block (MIB) .
[0116] In some embodiments, if the DL transmission comprises the SIB1, the information regarding the DL transmission power can be indicated by an aggregation level (AL) of a corresponding PDCCH transmission (e.g., Type0-PDCCH’s AL) . In some embodiments, the wireless communication device may determine the information regarding the DL transmission power according to a mapping or a rule corresponding to the aggregation level.
[0117] In some embodiments, if the DL transmission comprises the SIBx, the information regarding the DL transmission power can be indicated in a corresponding PDCCH transmission or by an aggregation level of the corresponding PDCCH transmission (e.g., Type0A-PDCCH’s AL) . In some embodiments, if the DL transmission comprises the SIB1 or the SIBx, the information regarding the DL transmission power can be indicated in a master information block (MIB) .
[0118] In some embodiments, if the DL transmission comprises the DM-RS, the PDSCH, the CSI-RS, or the TRS, the information regarding the DL transmission power can be indicated by a downlink control information (DCI) signaling. In certain embodiments, the CSI-RS or the TRS can be aperiodic. In some embodiments, if the DL transmission comprises the DM-RS, the PDCCH, the CSI-RS, or the TRS, the information regarding the DL transmission power can be indicated by a medium access control control element (MAC CE) signaling. In certain embodiments, the CSI-RS or the TRS can be semi-persistent.
[0119] In some embodiments, if the DL transmission comprises the CSI-RS or the TRS, the information regarding the DL transmission power can be indicated by a radio resource control (RRC) signaling. In certain embodiments, the CSI-RS or the TRS can be periodic. In some embodiments, if the DL transmission comprises the CD SSB, the information regarding the DL transmission power can be indicated by a transmission power of an SSB (e.g., ss-PBCH-BlockPower) in each SIB1. A value of the transmission power of the SSB (e.g., ss-PBCH-BlockPower) can be different among multiple SIB1s.
[0120] In some embodiments, if the DL transmission comprises the CD SSB, the information regarding the DL transmission power can be determined by wireless communication device according to a list of power compensation factors associated with one or more elevation angles. In some embodiments, if the DL transmission comprises the CD SSB or the NCD SSB, the information regarding the DL transmission power can be indicated by system information or a user equipment (UE) specific signaling.
[0121] In some embodiments, a wireless communication node (e.g., a base station (BS) ) may transmit a downlink (DL) transmission to a wireless communication device (e.g., a user equipment (UE) ) . The wireless communication device may determine information regarding a DL transmission power for the DL transmission.
[0122] While various embodiments of the present solution have been described above, it should be understood that they have been presented by way of example only, and not by way of limitation. Likewise, the various diagrams may depict an example architectural or configuration, which are provided to enable persons of ordinary skill in the art to understand example features and functions of the present solution. Such persons would understand, however, that the solution is not restricted to the illustrated example architectures or configurations, but can be implemented using a variety of alternative architectures and configurations. Additionally, as would be understood by persons of ordinary skill in the art, one or more features of one embodiment can be combined with one or more features of another embodiment described herein. Thus, the breadth and scope of the present disclosure should not be limited by any of the above-described illustrative embodiments.
[0123] It is also understood that any reference to an element herein using a designation such as "first, " "second, " and so forth does not generally limit the quantity or order of those elements. Rather, these designations can be used herein as a convenient means of distinguishing between two or more elements or instances of an element. Thus, a reference to first and second elements does not mean that only two elements can be employed, or that the first element must precede the second element in some manner.
[0124] Additionally, a person having ordinary skill in the art would understand that information and signals can be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits and symbols, for example, which may be referenced in the above description can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0125] A person of ordinary skill in the art would further appreciate that any of the various illustrative logical blocks, modules, processors, means, circuits, methods and functions described in connection with the aspects disclosed herein can be implemented by electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two) , firmware, various forms of program or design code incorporating instructions (which can be referred to herein, for convenience, as "software" or a "software module) , or any combination of these techniques. To clearly illustrate this interchangeability of hardware, firmware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware, firmware or software, or a combination of these techniques, depends upon the particular application and design constraints imposed on the overall system. Skilled artisans can implement the described functionality in various ways for each particular application, but such implementation decisions do not cause a departure from the scope of the present disclosure.
[0126] Furthermore, a person of ordinary skill in the art would understand that various illustrative logical blocks, modules, devices, components and circuits described herein can be implemented within or performed by an integrated circuit (IC) that can include a general purpose processor, a digital signal processor (DSP) , an application specific integrated circuit (ASIC) , a field programmable gate array (FPGA) or other programmable logic device, or any combination thereof. The logical blocks, modules, and circuits can further include antennas and / or transceivers to communicate with various components within the network or within the device. A general purpose processor can be a microprocessor, but in the alternative, the processor can be any conventional processor, controller, or state machine. A processor can also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other suitable configuration to perform the functions described herein.
[0127] If implemented in software, the functions can be stored as one or more instructions or code on a computer-readable medium. Thus, the steps of a method or algorithm disclosed herein can be implemented as software stored on a computer-readable medium. Computer-readable media includes both computer storage media and communication media including any medium that can be enabled to transfer a computer program or code from one place to another. A storage media can be any available media that can be accessed by a computer. By way of example, and not limitation, such computer-readable media can include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium that can be used to store desired program code in the form of instructions or data structures and that can be accessed by a computer.
[0128] In this document, the term "module" as used herein, refers to software, firmware, hardware, and any combination of these elements for performing the associated functions described herein. Additionally, for purpose of discussion, the various modules are described as discrete modules; however, as would be apparent to one of ordinary skill in the art, two or more modules may be combined to form a single module that performs the associated functions according embodiments of the present solution.
[0129] Additionally, memory or other storage, as well as communication components, may be employed in embodiments of the present solution. It will be appreciated that, for clarity purposes, the above description has described embodiments of the present solution with reference to different functional units and processors. However, it will be apparent that any suitable distribution of functionality between different functional units, processing logic elements or domains may be used without detracting from the present solution. For example, functionality illustrated to be performed by separate processing logic elements, or controllers, may be performed by the same processing logic element, or controller. Hence, references to specific functional units are only references to a suitable means for providing the described functionality, rather than indicative of a strict logical or physical structure or organization.
[0130] Various modifications to the embodiments described in this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the scope of this disclosure. Thus, the disclosure is not intended to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the novel features and principles disclosed herein, as recited in the claims below.
Claims
1.A method comprising:determining, by a wireless communication device, information regarding a downlink (DL) transmission power for a DL transmission,wherein the DL transmission is to be from a wireless communication node to the wireless communication device.2.The method of claim 1, wherein the information regarding DL transmission power comprises at least one of:a transmission power gap between a system information block type 1 (SIB1) and a corresponding synchronization signal block (SSB) ;a transmission power gap between a system information block type x (SIBx) where x is a positive integer value and a corresponding SSB;a transmission power of the SIB1 or the SIBx;a predefined transmission power gap;a flag for enabling the transmission power gap;an offset of an energy per resource element (EPRE) between a target reference signal (RS) and a corresponding source RS;a predefined EPRE offset;a flag for enabling the predefined EPRE offset;a transmission power of an SSB;a list of power compensation factors associated with one or more elevation angles;a transmission power gap between a cell defining (CD) SSB and one or more non cell defining (NCD) SSBs; ora transmission power of one or more NCD SSBs.3.The method of claim 1, wherein the DL transmission comprises at least one of:a system information block type 1 (SIB1) ;a system information block type x (SIBx) where x is a positive integer value;a demodulation reference signal (DM-RS) ;a physical downlink shared channel (PDSCH) transmission;a physical downlink control channel (PDCCH) transmission;a channel state information reference signal (CSI-RS) ;a tracking reference signal (TRS) ;a cell defining (CD) synchronization signal block (SSB) ; ora non cell defining (NCD) SSB.4.The method of claim 3, wherein if the DL transmission comprises the SIB1, the information regarding the DL transmission power is indicated in a corresponding PDCCH transmission.5.The method of claim 4, comprising:determining, by the wireless communication device, whether a field is present, according to a type of the wireless communication device or a type of a network to be accessed by the wireless communication device; ordetermining, by the wireless communication device, whether a field is present, according to an indication in a master information block (MIB) .6.The method of claim 3, wherein if the DL transmission comprises the SIB1, the information regarding the DL transmission power is indicated by an aggregation level of a corresponding PDCCH transmission.7.The method of claim 6, comprising:determining, by the wireless communication device, the information regarding the DL transmission power according to a mapping or a rule corresponding to the aggregation level.8.The method of claim 3, wherein if the DL transmission comprises the SIBx, the information regarding the DL transmission power is indicated in a corresponding PDCCH transmission or by an aggregation level of the corresponding PDCCH transmission.9.The method of claim 3, wherein if the DL transmission comprises the SIB1 or the SIBx, the information regarding the DL transmission power is indicated in a master information block (MIB) .10.The method of claim 3, wherein if the DL transmission comprises the DM-RS, the PDSCH, the CSI-RS, or the TRS, the information regarding the DL transmission power is indicated by a downlink control information (DCI) signaling.11.The method of claim 3, wherein if the DL transmission comprises the DM-RS, the PDCCH, the CSI-RS, or the TRS, the information regarding the DL transmission power is indicated by a medium access control control element (MAC CE) signaling.12.The method of claim 3, wherein if the DL transmission comprises the CSI-RS or the TRS, the information regarding the DL transmission power is indicated by a radio resource control (RRC) signaling.13.The method of claim 3, wherein if the DL transmission comprises the CD SSB, the information regarding the DL transmission power is indicated by a transmission power of an SSB in each SIB1, wherein a value of the transmission power of the SSB is different among multiple SIB1s.14.The method of claim 3, wherein if the DL transmission comprises the CD SSB, the information regarding the DL transmission power is determined by wireless communication device according to a list of power compensation factors associated with one or more elevation angles.15.The method of claim 3, wherein if the DL transmission comprises the CD SSB or the NCD SSB, the information regarding the DL transmission power is indicated by system information or a user equipment (UE) specific signaling.16.A method comprising:transmitting, by a wireless communication node to a wireless communication device, a downlink (DL) transmission,wherein the wireless communication device determines information regarding a DL transmission power for the DL transmission.17.A non-transitory computer readable medium storing instructions, which when executed by at least one processor, cause the at least one processor to perform the method of any one of claims 1-16.18.An apparatus comprising:at least one processor configured to perform the method of any one of claims 1-16.
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