Power control for multiple trp

Abstract

Example embodiments of the present disclosure relate to power control for multiple TRP. For physical random access channel (PRACH) transmission to a first transmission receiving point (TRP), the terminal device determines a transmission power corresponding to the first TRP. The PRACH transmission is triggered via a Physical Downlink Control Channel (PDCCH) command from the second TRP to the terminal device. And the terminal equipment sends the PRACH transmission to the first TRP by using the transmission power.

Description

Technical Field

[0001] Various example embodiments of the present disclosure relate generally to the field of telecommunications, and in particular, to methods, apparatus, and computer-readable storage media for power control of multiple transmission reception points (TRPs). Background Art

[0002] Communication technologies have been developed across various communication standards to provide common protocols that enable diverse wireless devices to communicate at the city, national, regional, and even global levels. An example communication standard is New Radio (NR), such as 5G radio access. In NR, a next-generation Node B (gNB) can be equipped with multiple Transmission Relays (TRPs). This means that a gNB can communicate with a user equipment (UE) via one or more of these TRPs, also known as multi-TRP operation. Summary of the Invention

[0003] In a first aspect of the present disclosure, an apparatus is provided. The apparatus includes: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: determine, for a physical random access channel (PRACH) transmission to a first transmission reception point (TRP), a transmission power corresponding to the first TRP, wherein the PRACH transmission is triggered via a physical downlink control channel (PDCCH) command from a second TRP to the apparatus; and send the PRACH transmission to the first TRP using the transmission power.

[0004] In a second aspect of the present disclosure, an apparatus is provided. The apparatus includes: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: receive, from a terminal device, a PRACH transmission at a first transmission resource allocation (TRP), the PRACH transmission being triggered via a PDCCH command from a second transmission resource allocation (TRP) to the terminal device, wherein a transmission power corresponding to the first transmission resource allocation (TRP) is determined for the PRACH transmission.

[0005] In a third aspect of the present disclosure, a method is provided. The method comprises: determining, at a terminal device, for a PRACH transmission to a first TRP, a transmission power corresponding to the first TRP, wherein the PRACH transmission is triggered via a PDCCH command from a second TRP to the terminal device; and sending the PRACH transmission to the first TRP using the transmission power.

[0006] In a fourth aspect of the present disclosure, a method is provided. The method includes: receiving, at a network device, a PRACH transmission from a terminal device by a first TRP, the PRACH transmission being triggered via a PDCCH command from a second TRP to the terminal device, wherein a transmission power corresponding to the first TRP is determined for the PRACH transmission.

[0007] In a fifth aspect of the present disclosure, an apparatus is provided. The apparatus comprises: means for determining a transmission power corresponding to a first TRP for a PRACH transmission to the first TRP, wherein the PRACH transmission is triggered via a PDCCH command from a second TRP to the apparatus; and means for sending the PRACH transmission to the first TRP using the transmission power.

[0008] In a sixth aspect of the present disclosure, an apparatus is provided. The apparatus includes means for receiving, by a first TRP, a PRACH transmission from a terminal device, the PRACH transmission being triggered via a PDCCH command from a second TRP to the terminal device, wherein a transmission power corresponding to the first TRP is determined for the PRACH transmission.

[0009] In a seventh aspect of the present disclosure, a non-transitory computer-readable medium is provided. The non-transitory computer-readable medium includes program instructions that, when executed by an apparatus, cause the apparatus to at least: determine, for a PRACH transmission to a first TRP, a transmission power corresponding to the first TRP, wherein the PRACH transmission is triggered via a PDCCH command from a second TRP to the apparatus; and send the PRACH transmission to the first TRP using the transmission power.

[0010] In an eighth aspect of the present disclosure, a non-transitory computer-readable medium is provided. The non-transitory computer-readable medium includes program instructions that, when executed by an apparatus, cause the apparatus to at least perform: receiving, by a first transmission resource allocation protocol (TRP), a PRACH transmission from a terminal device, the PRACH transmission being triggered via a PDCCH command from a second transmission resource allocation protocol (TRP) to the terminal device, wherein a transmission power corresponding to the first transmission resource allocation protocol (TRP) is determined for the PRACH transmission.

[0011] In a ninth aspect of the present disclosure, a computer program is provided. The computer program includes instructions that, when executed by an apparatus, cause the apparatus to at least perform the following: determining, for a PRACH transmission to a first TRP, a transmit power corresponding to the first TRP, wherein the PRACH transmission is triggered via a PDCCH command from a second TRP to the apparatus; and sending the PRACH transmission to the first TRP using the transmit power.

[0012] In a tenth aspect of the present disclosure, a computer program is provided. The computer program includes instructions that, when executed by an apparatus, cause the apparatus to at least perform the following: receiving, by a first transmission resource allocation (TRP), a PRACH transmission from a terminal device, the PRACH transmission being triggered via a PDCCH command from a second transmission resource allocation (TRP) to the terminal device, wherein a transmission power corresponding to the first transmission resource allocation (TRP) is determined for the PRACH transmission.

[0013] It should be understood that the invention summary is not intended to identify the key or essential features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Some example embodiments will now be described with reference to the accompanying drawings, in which:

[0015] Figure 1 An example communication environment is shown in which example embodiments of the present disclosure may be implemented;

[0016] Figure 2 shows a signaling diagram for power control of multiple TRPs according to some example embodiments of the present disclosure;

[0017] Figure 3 A flowchart of a method implemented at a terminal device according to some example embodiments of the present disclosure is shown;

[0018] Figure 4 A flowchart illustrating a method implemented at a network device according to some example embodiments of the present disclosure is shown;

[0019] Figure 5 shows a simplified block diagram of a device suitable for implementing an example embodiment of the present disclosure; and

[0020] Figure 6 A block diagram of an example computer-readable medium is shown, according to some example embodiments of the present disclosure.

[0021] Throughout the drawings, the same or similar reference numerals refer to the same or similar elements. DETAILED DESCRIPTION

[0022] The principles of the present disclosure will now be described with reference to some example embodiments. It should be understood that these embodiments are described for illustrative purposes only and help those skilled in the art understand and implement the present disclosure without implying any limitation on the scope of the present disclosure. The embodiments described herein can be implemented in various ways except for the manner described below.

[0023] In the following description and claims, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.

[0024] References in this disclosure to "one embodiment," "an embodiment," "an example embodiment," etc., indicate that the described embodiment may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes the particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is considered within the knowledge of those skilled in the art to affect such feature, structure, or characteristic in conjunction with other embodiments (whether or not explicitly described).

[0025] It should be understood that although the terms "first," "second," etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of the example embodiments. As used herein, the term "and / or" includes any and all combinations of one or more of the listed terms.

[0026] As used herein, “at least one of: ” and “at least one of ” and similar expressions (where a list of two or more elements is connected by “and” or “or”) refer to at least any one of the elements, or at least any two or more of the elements, or at least all of the elements.

[0027] As used herein, unless explicitly stated, performing a step “in response to A” does not mean performing the step immediately after “A” occurs, and one or more intermediate steps may be included.

[0028] The terms used herein are for the purpose of describing specific embodiments only and are not intended to limit the example embodiments. As used herein, unless the context clearly indicates otherwise, the singular forms "a," "an," and "the" are intended to include the plural forms as well. It will be further understood that when used herein, the terms "comprise," "including," "having," "including," and / or "comprising" specify the presence of stated features, elements, and / or components, etc., but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof.

[0029] As used in this application, the term "circuitry" may refer to one or more or all of the following: (a) hardware circuit implementation only (such as implementation only in analog and / or digital circuitry), and (b) a combination of hardware circuitry and software such as (if applicable): (i) a combination of analog and / or digital hardware circuitry and software / firmware; and (ii) any portion of a hardware processor with software (including a digital signal processor, software, and memory that work together to enable a device such as a mobile phone or server to perform various functions); and (c) Hardware circuits and / or processors, such as a microprocessor or portion of a microprocessor, that require software (e.g., firmware) for operation, but where the software is not required for operation, the software may not be present.

[0030] This definition of circuitry applies to all uses of this term in this application, including in any claims. As a further example, as used in this application, the term circuitry also covers an implementation of merely a hardware circuit or processor (or processors) or a portion of a hardware circuit or processor and its (or their) accompanying software and / or firmware. For example, and if applicable to the particular claim element, the term circuitry also covers a baseband integrated circuit or processor integrated circuit for a mobile device, or a similar integrated circuit in a server, cellular network device, or other computing or networking device.

[0031] As used herein, the term "communication network" refers to a network that complies with any suitable communication standard, such as New Radio (NR), Long Term Evolution (LTE), Advanced LTE (LTE-A), Wideband Code Division Multiple Access (WCDMA), High Speed ​​Packet Access (HSPA), Narrowband Internet of Things (NB-IoT), etc. In addition, the communication between the terminal equipment and the network equipment in the communication network is performed according to any suitable generation communication protocol, including but not limited to the first generation (1G) communication protocol, the second generation (2G) communication protocol, the 2.5G communication protocol, the 2.75G communication protocol, the third generation (3G) communication protocol, the fourth generation (4G) communication protocol, the 4.5G communication protocol, the fifth generation (5G) communication protocol and / or any other protocol currently known or developed in the future. The embodiments of the present disclosure can be applied to various communication systems. In view of the rapid development of communications, there are of course future types of communication technologies and systems that can implement the present disclosure. It should not be considered that the scope of the present disclosure is limited to the above-mentioned systems.

[0032] As used herein, the term "network device" refers to a node in a communication network via which a terminal device accesses the network and receives services from it. A network device may refer to a base station (BS) or an access point (AP), such as a Node B (NodeB or NB), an evolved NodeB (eNodeB or eNB), a NR NB (also known as a gNB), a remote radio unit (RRU), a radio head (RH), a remote radio head (RRH), a repeater, an integrated access and backhaul (IAB) node, a low-power node (such as a femto, a micro), a non-terrestrial network (NTN) or a non-terrestrial network device (such as a satellite network device, a low earth orbit (LEO) satellite and a geosynchronous orbit (GEO) satellite, an aircraft network device, etc.), depending on the terminology and technology applied. In some example embodiments, a radio access network (RAN) split architecture includes a central unit (CU) and a distributed unit (DU) at an IAB donor node. An IAB node includes a mobile terminal (IAB-MT) portion similar to a UE toward a parent node, and the DU portion of the IAB node is similar to a base station toward a next-hop IAB node.

[0033] The term "terminal device" refers to any terminal device capable of wireless communication. As an example and not limitation, a terminal device may also be referred to as a communication device, user equipment (UE), subscriber station (SS), portable subscriber station, mobile station (MS) or access terminal (AT). Terminal devices may include, but are not limited to, mobile phones, cellular phones, smart phones, voice over IP (VoIP) phones, wireless local loop phones, tablet computers, wearable terminal devices, personal digital assistants (PDAs), portable computers, desktop computers, image acquisition terminal devices such as digital cameras, game terminal devices, music storage and playback devices, in-vehicle wireless terminal devices, wireless endpoints, mobile stations, laptop embedded devices (LEEs), laptop mounted devices (LMEs), USB dongles, smart devices, wireless customer premises equipment (CPEs), Internet of Things (IoT) devices, watches or other wearable devices, head-mounted displays (HMDs), vehicles, drones, medical devices and applications (e.g., remote surgery), industrial devices and applications (e.g., robots and / or other wireless devices operating in the context of industrial and / or automated processing chains), consumer electronic devices, devices operating on commercial and / or industrial wireless networks, etc. The terminal device may also correspond to the mobile terminal (MT) portion of an IAB node (eg, a relay node).In the following description, the terms "terminal device," "communication device," "terminal," "user equipment," and "UE" may be used interchangeably.

[0034] As used herein, the terms "resource," "transmission resource," "resource block," "physical resource block" (PRB), "uplink resource," or "downlink resource" may refer to any resource used to perform communication (e.g., communication between a terminal device and a network device), such as resources in the time domain, resources in the frequency domain, resources in the spatial domain, resources in the code domain, or any other combination thereof for achieving communication. Hereinafter, unless explicitly stated otherwise, resources in the frequency domain and the time domain will be used as examples of transmission resources for describing some example embodiments of the present disclosure. Note that the example embodiments of the present disclosure are equally applicable to other resources in other domains.

[0035] As used herein, the term "TRP" may refer to an antenna port or antenna array (having one or more antenna elements) available to a network device located at a specific geographic location. For example, a network device may be coupled with multiple TRPs in different geographic locations to achieve better coverage. Alternatively or additionally, multiple TRPs may be incorporated into a network device, or in other words, a network device may include multiple TRPs. The term "TRP" may also be referred to as a cell, such as a macro cell, a small cell, a pico cell, a femto cell, a remote radio head, a relay node, etc. It should be understood that the term "TRP" may refer to a logical concept that can be physically implemented in various ways. For example, a TRP may refer to or correspond to a physical cell identifier (PCI) or a control resource set (CORESET) pool index (CORESETPoolIndex) or an uplink reference signal set or a timing advance group (TAG). In the example embodiments of the present disclosure, the term "TRP" may be used interchangeably with the terms "PCI", "CORESETPoolIndex", and "TAG". Therefore, the example embodiments described with respect to TRP may be applied to PCI, CORESETPoolIndex, and TAG.

[0036] In some example embodiments of the present disclosure, a PCI may be associated with a TRP in any suitable manner. For example, the PCI associated with a TRP may represent or correspond to the TRP. For another example, the PCI associated with a TRP may be the PCI of a cell to which the TRP belongs, or the PCI of a cell in which the TRP is located, or the PCI of a cell associated with the TRP.

[0037] In some example embodiments of the present disclosure, CORESETPoolIndex may be associated with a TRP in any suitable manner. For example, the CORESETPoolIndex associated with a TRP may be the CORESETPoolIndex of the control resources configured for the TRP.

[0038] In some example embodiments of the present disclosure, a TAG may be associated with a TRP in any suitable manner. For example, the TAG associated with the TRP may be a TAG to which a cell belongs, or is located within or associated with the cell.

[0039] Figure 1 An example communication environment 100 is shown in which example embodiments of the present disclosure may be implemented. In the communication environment 100, a network device 120 is coupled to or equipped with two TRPs, including a first TRP 131 and a second TRP 132. The network device 120 provides one or more cells. In this example, the first TRP 131 is within or associated with cell 101, and the second TRP 132 is within or associated with cell 102. It should be understood that Figure 1 The communication environment 100 shown is an example without any limitation. Alternatively, in some example embodiments, two network devices may be coupled to two TRPs, respectively. For example, the network device 120 may be coupled to the first TRP 131, and another network device (not shown) may be coupled to the second TRP 132.

[0040] Environment 100 also includes a terminal device 110 served by network device 120. In some example embodiments, cell 101 may be a serving cell for terminal device 110 and cell 102 may be a non-serving cell for terminal device 110.

[0041] It should be understood that the number of network devices, terminal devices, and TRPs is for illustrative purposes only and does not imply any limitation. Environment 100 may include any suitable number of network devices, terminal devices, and TRPs suitable for implementing embodiments of this aspect of the present disclosure. Furthermore, it should be understood that the operations described in conjunction with terminal device 110 may be implemented at a network device or other device, and that the operations described in conjunction with network device 120 may be implemented at a terminal device or other device.

[0042] In the communication environment 100, the network device 120 can communicate data and control information to the terminal device 110 through the first TRP 131 and / or the second TRP 132. The terminal device 110 can also communicate data and control information to the network device 120 through the first TRP 131 and / or the second TRP 132. The link from the network device 120 to the terminal device 110 is called the downlink (DL) or forward link, and the link from the terminal device 110 to the network device 120 is called the uplink (UL) or reverse link. In the DL, the network device 120 is a transmitting (TX) device (or transmitter), and the terminal device 110 is a receiving (RX) device (or receiver). In the UL, the terminal device 110 is a TX device (or transmitter), and the network device 120 is an RX device (or receiver).

[0043] Communications in the communication environment 100 may be implemented according to any suitable communication protocol, including but not limited to first generation (1G), second generation (2G), third generation (3G), fourth generation (4G), fifth generation (5G), sixth generation (6G), etc. cellular communication protocols, wireless local area network communication protocols such as Institute of Electrical and Electronics Engineers (IEEE) 802.11, etc., and / or any other protocol currently known or developed in the future. In addition, communications may utilize any suitable wireless communication technology, including but not limited to: code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), frequency division duplex (FDD), time division duplex (TDD), multiple input multiple output (MIMO), orthogonal frequency division multiple access (OFDM), discrete Fourier transform spread OFDM (DFT-s-OFDM), and / or any other technology currently known or developed in the future.

[0044] During communication, terminal device 110 may perform a physical random access channel (PRACH) transmission with network device 120. In other words, terminal device 110 may send a random access preamble (RAP) to network device 120. To perform the PRACH transmission, terminal device 110 may determine a transmission power for the PRACH transmission.

[0045] In an example, the terminal device 110 may determine the transmission power P for PRACH over the active UL bandwidth (BWP) b of carrier f of serving cell c based on the DL reference signal (RS) for serving cell c in transmission opportunity i. PRACH,b,f,c (i) is: P PRACH,b,f,c (i) = min{P CMAX,f,c (i),P PRACH,target,f,c +PL b,f,c}[dBm], (1) Among them, P CMAX,f,c(i) is the maximum output power of carrier f configured by the terminal device for serving cell c in transmission opportunity i, P PRACH,target,f,c is the PRACH target received power PREAMBLE_RECEIVED_TARGET_POWER provided by higher layers for the active UL BWPb of carrier f serving cell c, and PL b,f,c is the path loss of the active UL BWPb for carrier f based on the DL RS associated with the PRACH transmission on the active DL BWP of serving cell c and is calculated by the terminal device 110 in dB as referenceSignalPower - higher layer filtered reference signal received power (RSRP) in dBm. If the active DL BWP is the initial DL BWP and is for synchronization signal (SS) / physical broadcast channel (PBCH) blocks and control resource set (CORESET) multiplexing mode 2 or 3, the terminal device 110 determines the PL based on the SS / PBCH blocks associated with the PRACH transmission. b,f,c .

[0046] If the PRACH transmission from the terminal device 110 is not in response to a PDCCH command detected by the terminal device 110, or is in response to a PDCCH command detected by the terminal device 110 that triggers a contention-based random access procedure, or is associated with a link recovery procedure, where the corresponding index q new If associated with an SS / PBCH block, referenceSignalPower is provided by ss-PBCH-BlockPower.

[0047] If the PRACH transmission from the terminal device 110 is in response to a PDCCH command detected by the terminal device 110 triggering a contention-free random access procedure and depends on a DLRS that is quasi-co-located (QCL) with a demodulation reference signal (DM-RS) of the PDCCH command, the referenceSignalPower is provided by ss-PBCH-BlockPower, or if the terminal device 110 is configured for resources for periodic channel state information reference signal (CSI-RS) reception or the PRACH transmission is associated with a link recovery procedure, where the corresponding index q newIn association with a periodic CSI-RS configuration, referenceSignalPower is derived from ss-PBCH-BlockPower and powerControlOffsetSS, where powerControlOffsetSS provides an offset for the CSI-RS transmit power relative to the SS / PBCH block transmit power. If powerControlOffsetSS is not provided to the terminal device 110, the terminal device 110 assumes an offset of 0 dB. If the active transmission configuration indicator (TCI) state of the PDCCH used to provide the PDCCH command includes two RSs, the terminal device 110 expects one RS to be configured with qcl-Type set to 'typeD', and the terminal device 110 uses that one RS when applying the value provided by powerControlOffsetSS.

[0048] As can be seen from the above, PRACH transmission can be triggered by a PDCCH command. On the other hand, two timing advances (TAs) for UL multi-DCI have been proposed for multi-TRP operation. Specifically, for multi-TRP operation based on multi-DCI with two TA enhancements, it is necessary to support the case where a PDCCH command sent by one TRP triggers a RACH process to the same TRP or different TRPs for at least inter-cell multi-DCI. This means that a PRACH transmission towards or to a TRP can be triggered by a PDCCH command from another TRP.

[0049] In one approach, for example, as described above in the PRACH transmission power formula (1), the PRACH target received power is the same regardless of the TRP and / or cell to which the PRACH is sent. However, this does not apply to multi-TRP operation.

[0050] Furthermore, for contention-free random access (CFRA), the UE assumes that the random access response (RAR) and the PDCCH order that trigger the PRACH transmission are co-located. However, this assumption may no longer hold if one TRP triggers a PRACH transmission towards another TRP and depends on the TRP from which the corresponding RAR is sent. Therefore, proper path loss estimation needs to be ensured in this case.

[0051] According to some example embodiments of the present disclosure, a scheme for power control of multiple TRPs is provided. In this scheme, for a PRACH transmission to a first TRP, a terminal device determines a transmission power corresponding to the first TRP. The PRACH transmission is triggered via a PDCCH command from a second TRP to the terminal device. The terminal device then performs a PRACH transmission to the first TRP using the transmission power.

[0052] The proposed solution enables determination of the appropriate PRACH transmission power when one TRP triggers a PRACH transmission towards another TRP. In this way, UL power control for multi-TRP operation is enhanced. Furthermore, this enhancement is achieved without increasing control overhead and reducing the burden on the terminal device.

[0053] Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0054] Figure 2 2 shows a signaling diagram 200 for power control of multiple TRPs according to some example embodiments of the present disclosure. Figure 2 As shown, the signaling diagram 200 involves the terminal device 110 and the network device 120. For the purpose of discussion, reference is made to Figure 1 2. Signaling diagram 200 is described below.

[0055] For a PRACH transmission to a TRP (shown as a first TRP 131 as an example and also referred to as a target TRP), the terminal device 110 determines 205 a transmission power corresponding to the first TRP 101. The PRACH transmission to the first TRP 101 is triggered via a PDCCH command from another TRP (shown as a second TRP 132 as an example) to the terminal device 110.

[0056] In some example embodiments, first TRP 131 and second TRP 132 may each be associated with two different PCIs. In other words, first TRP 131 is associated with a first PCI, and second TRP 132 is associated with a second PCI that is different from the first PCI. For example, first TRP 131 may be located within or associated with cell 101 (also referred to as a target cell), and second TRP 132 may be located within or associated with cell 102. Cell 101 and cell 102 have different PCIs.

[0057] In some example embodiments, first TRP 131 may be located within or associated with a serving cell, and second TRP 132 may be located within or associated with a non-serving cell. For example, first TRP 131 may correspond to a PCI for a serving cell, and second TRP 132 may correspond to another PCI for a non-serving cell.

[0058] The terminal device 110 can determine the transmission power corresponding to the first TRP 131 based on one or more factors (also referred to as one or more specific factors, or one or more TRP-specific factors) for the first TRP 131.

[0059] The one or more TRP-specific factors may include a PRACH target receive power for the first TRP 131. In some example embodiments, the transmission power may be determined based on a PRACH target receive power corresponding to a PCI associated with the first TRP 131, also referred to as a target TRP. For example, the PRACH target receive power may be configured according to the PCI via higher layers (such as via a radio resource control RRC or a system information block SIB) or indicated according to the TRP in dynamic signaling (such as via a medium access control MAC, a control element CE, or downlink control information DCI). Therefore, the terminal device 110 may determine the transmission power based on the PRACH target receive power configured or indicated for the PCI associated with the first TRP 131.

[0060] Alternatively or additionally, in some example embodiments, the transmission power may be determined based on a PRACH target received power for the first TRP 131. For example, the PRACH target received power may be configured according to the TRP via higher layers or indicated according to the TRP in dynamic signaling. Accordingly, the terminal device 110 may determine the transmission power based on the PRACH target received power configured or indicated for the first TRP 131.

[0061] Alternatively or additionally, in some example embodiments, the transmission power may be determined based on a PRACH target received power corresponding to a CORESETPoolIndex associated with the first TRP 131, the CORESETPoolIndex also being referred to as a target CORESETPoolIndex. For example, the PRACH target received power may be configured via a higher layer according to the CORESETPoolIndex or indicated in dynamic signaling according to the CORESETPoolIndex. Thus, the terminal device 110 may determine the transmission power based on the PRACH target received power configured or indicated for the CORESETPoolIndex associated with the first TRP 131.

[0062] Alternatively or additionally, in some example embodiments, the transmission power may be determined based on a PRACH target received power corresponding to a TAG associated with the first TRP 131, which TAG is also referred to as a target TAG. For example, the PRACH target received power may be configured via a higher layer according to the TAG or indicated in dynamic signaling according to CORESETPoolIndex. Thus, the terminal device 110 may determine the transmission power based on the PRACH target received power configured or indicated for the TAG associated with the first TRP 131.

[0063] Hereinafter, a PRACH target reception power corresponding to at least one of a PCI associated with the first TRP 131, the first TRP 131, a CORESETPoolIndex associated with the first TRP 131, or a TAG associated with the first TRP 131 may be referred to as a specific PRACH target reception power.

[0064] In an example, more than one preambleReceivedTargetPower value may be configured in an information element (IE) (e.g., in an IE RACH-ConfigGeneric). Each preambleReceivedTargetPower value (which is also referred to as a specific preambleReceivedTargetPower value) may be associated with at least one of a PCI, a TRP, a CoresetPoolindex, or a TAG. In such an example, the terminal device 110 may determine the transmission power corresponding to the first TRP 131 using the preambleReceivedTargetPower value associated with: the PCI associated with the first TRP 131, the first TRP 131, the CoresetPoolIndex associated with the first TRP 131, or the TAG associated with the first TRP 131.

[0065] In some exemplary embodiments, the specific preambleReceivedTargetPower value may be an absolute value of the PRACH target received power. Therefore, the specific preambleReceivedTargetPower value is directly used as the specific PRACH target received power to determine the transmission power.

[0066] Alternatively, in some example embodiments, the specific preambleReceivedTargetPower value may be an offset value relative to a reference power level or a common power level. Thus, the terminal device 110 may determine the specific PRACH target received power based on the specific preambleReceivedTargetPower value and the reference power level or the common power level. For example, the term P in the above formula (1) does not distinguish between different TRPs. PRACH,tar get,f,cThe specific preambleReceivedTargetPower value is then added to the common power level as an offset to determine the exact value for a specific PRACH target received power, for example, the exact value of PREAMBLE_RECEIVED_TARGET_POWER corresponding to: the PCI associated with the first TRP 131, the first TRP 131, the CORESETPoolIndex associated with the first TRP 131, or the TAG associated with the first TRP 131.

[0067] Alternatively or additionally, in some example embodiments, the one or more TRP-specific factors may include a path loss for the first TRP 131. For example, the terminal device 110 may determine the transmit power based on a path loss (which may also be referred to as a TRP-specific path loss) corresponding to at least one of the following: a PCI associated with the first TRP 131, the first TRP 131, a CORESETPoolIndex associated with the first TRP 131, or a TAG associated with the first TRP 131.

[0068] In some example embodiments, a PRACH transmission to a first TRP 131 may be associated with a CFRA procedure. In such example embodiments, a random access response (RAR) from the first TRP 131 is not collocated with a PDCCH order that triggers the PRACH transmission because the PDCCH order is from another TRP. Therefore, the transmission power corresponding to the first TRP 131 may be determined based at least in part on a path loss estimate using a RS associated with a synchronization signal-physical broadcast channel block (SSB) corresponding to the PRACH transmission.

[0069] The path loss may be based on a reference signal power, which may be denoted as referenceSignalPower. For example, the path loss may be determined as the reference signal power plus the higher layer filtered RSRP. In view of this, in some example embodiments, the terminal device 110 may determine the transmission power based on the reference signal power for the first TRP 131. For example, the transmission power may be determined based on the reference signal power corresponding to the PCI associated with the first TRP 131. Alternatively or additionally, the transmission power may be determined based on the reference signal power corresponding to the first TRP 131. Alternatively or additionally, the transmission power may be determined based on the reference signal power corresponding to the CORESETPoolIndex associated with the first TRP 131. Alternatively or additionally, the transmission power may be determined based on the reference signal power corresponding to the TAG associated with the first TRP 131. As an example, the reference signal power may be configured per PCI, per TRP, per CORESETPoolIndex, or per TAG.

[0070] In some example embodiments, the reference signal power for the first TRP 131 may be associated with a synchronization signal-physical broadcast channel (ss-PBCH) block power, which may be denoted as ss-PBCH-BlockPower. For example, if the PRACH transmission to the first TRP 131 is in response to a PDCCH command that triggers a CFRA procedure detected from the second TRP 132, or is associated with a link recovery procedure, where the corresponding index q new If associated with the SS / PBCH block, the reference signal power used for the first TRP 131 is associated with the SS-PBCH block power.

[0071] In such an example embodiment, the reference signal power for the first TRP 131 may be determined based on the ss-PBCH block power corresponding to the PCI associated with the first TRP 131. Alternatively or additionally, the reference signal power for the first TRP 131 may be determined based on the ss-PBCH block power corresponding to the first TRP 131. Alternatively or additionally, the reference signal power for the first TRP 131 may be determined based on the ss-PBCH block power corresponding to the CORESETPoolIndex associated with the first TRP 131. Alternatively or additionally, the reference signal power for the first TRP 131 may be determined based on the ss-PBCH block power corresponding to the TAG associated with the first TRP 131. In other words, the referenceSignalPower used for path loss calculation may be provided by the ss-PBCH-BlockPower corresponding to the target PCI, TRP, TAG, cell, or CORESETPoolIndex.

[0072] The path loss may be based on a higher layer filtered RSRP. For example, the path loss may be determined as the reference signal power plus the higher layer filtered RSRP. In view of this, in some example embodiments, the terminal device 110 may determine the transmission power based on the higher layer filtered RSRP for the first TRP 131. For example, the transmission power may be determined based on the higher layer filtered RSRP corresponding to the PCI associated with the first TRP 131. Alternatively or additionally, the transmission power may be determined based on the higher layer filtered RSRP corresponding to the first TRP 131. Alternatively or additionally, the transmission power may be determined based on the higher layer filtered RSRP corresponding to the CORESETPoolIndex associated with the first TRP 131. Alternatively or additionally, the transmission power may be determined based on the higher layer filtered RSRP corresponding to the TAG associated with the first TRP 131.

[0073] In some example embodiments, the higher layer filtered RSRP may be determined based on a DL RS corresponding to at least one of: a PCI associated with the first TRP 131, the first TRP 131, a CORESETPoolIndex associated with the first TRP 131, or a TAG associated with the first TRP 131. For example, the RSRP may be measured on the DL RS and filtered based on a higher layer filter configuration.

[0074] In some example embodiments, the transmit power may be determined based on a higher layer filtered RSRP associated with a DL RS corresponding to a PRACH transmission. That is, the higher layer filtered RSRP may be calculated based on the DL RS corresponding to or associated with the PRACH transmission. For example, the RSRP may be measured on the DL RS corresponding to the PRACH transmission to the first TRP 131 and filtered based on a higher layer filter configuration.

[0075] In some example embodiments, the transmit power may be determined based on an ss-PBCH block power associated with a DL RS corresponding to a PRACH transmission. For example, an SSB that is quasi-co-located (QCL) with a DL RS corresponding to a PRACH transmission may be determined, and the ss-PBCH block power for the SSB may be used as a reference signal power to determine the transmit power.

[0076] Continuing with the signaling diagram 200, upon determining the transmit power, the terminal device 110 sends 210 a PRACH transmission to the first TRP using the transmit power. The network device 120 receives 215 the PRACH transmission by the first TRP 131 .

[0077] The above signaling diagram 200 is described with respect to the TRP. As described above, the TRP can be associated with the PCI, and the terms "TRP" and "PCI" can be used interchangeably. That is, for a PRACH transmission corresponding to a first PCI, the terminal device 110 determines the transmission power corresponding to the first PCI. The PRACH transmission is triggered via a PDCCH command to the terminal device 110 corresponding to the second PCI. The terminal device 110 then performs the PRACH transmission corresponding to the first PCI using the transmission power.

[0078] The signaling diagram 200 is described above. An example scenario is now described. In the example scenario, it is assumed that the first TRP 131 is in a serving cell, and it is assumed that the second TRP 132 is in a non-serving cell. The first TRP 131 is associated with PCI 1, and the second TRP 132 is associated with PCI 2. The terminal device 110 is configured via a higher layer with a first PRACH target receive power for PCI 1 (which is represented as "P_PRACH, target, 1") and a second PRACH target receive power for PCI 2 (which is represented as "P_PRACH, target, 2").

[0079] The PDCCH command from the second TRP 132 or corresponding to PCI 2 triggers a PRACH transmission to the first TRP 131 or corresponding to PCI 1. This means that the first TRP 131 is the target TRP and PCI 1 is the target PCI. To determine the transmit power for the PRACH transmission, the terminal device 110 may use the configured "P_PRACH, target, 1" as the PRACH target receive power. For example, "P_PRACH, target, 1" may be incorporated into formula (1) as the term P PRACH,target,f,c .

[0080] The path loss may be calculated as the reference signal power minus the upper layer filter RSRP. The reference signal power, denoted as referenceSignalPower, may be determined as the SSB power corresponding to the target PCI or target TRP (i.e., PCI 1 or first TRP 131). The upper layer filter RSRP may be determined based on the DLRS corresponding to the PRACH transmission toward the first TRP 131 or PCI 1. Alternatively or additionally, the upper layer filter RSRP may be determined based on the SSB corresponding to the PRACH transmission toward the first TRP 131 or PCI 1. Based on the reference signal power and the upper layer filter RSRP, the path loss may be determined for the PRACH transmission and may be incorporated into formula (1) as the term PL b,f,c . Therefore, the transmission power corresponding to the first TRP 131 is determined as PRACH transmission toward the first TRP 131.

[0081] With the proposed solution, UL power control for multi-TRP operation is enhanced without actually increasing the control overhead, but rather reducing the burden at the terminal device.

[0082] Furthermore, the RAR monitoring operation can be improved for the CFRA case, especially when one TRP triggers a PRACH transmission towards another TRP and the backhaul between the TRPs is non-ideal. An efficient solution for the RAR monitoring operation to account for delays due to non-ideal backhaul is achieved.

[0083] Figure 3 FIG. 3 is a flow chart illustrating an example method 300 implemented at a terminal device according to some example embodiments of the present disclosure. Figure 1 The method 300 is described from the perspective of the terminal device 110.

[0084] At block 310, for a PRACH transmission to a first TRP, the terminal device 110 determines a transmission power corresponding to the first TRP. The PRACH transmission is triggered via a PDCCH command to the terminal device 110 from a second TRP.

[0085] At box 320, the terminal device 110 sends a PRACH transmission to the first TRP using the transmission power.

[0086] In some example embodiments, the first TRP and the second TRP are respectively associated with two different physical cell identifiers PCIs.

[0087] In some example embodiments, determining the transmission power includes determining the transmission power based on a PRACH target receive power corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a control resource set CORESET pool index CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0088] In some example embodiments, to determine the transmission power, the terminal device 110 may determine the transmission power based on a path loss corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0089] In some example embodiments, to determine the transmission power, the terminal device 110 may determine the transmission power based on a reference signal power corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0090] In some example embodiments, determining the transmission power based on the reference signal power includes determining the reference signal power based on an ss-PBCH block power corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0091] In some example embodiments, determining the transmission power includes determining the transmission power based on a higher layer filtered reference signal received power RSRP corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0092] In some example embodiments, determining the transmission power based on the higher layer filtered RSRP includes: determining the higher layer filtered RSRP based on a downlink reference signal corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0093] In some example embodiments, determining the transmit power comprises the terminal device 110 determining the transmit power based on a higher layer filtered RSRP associated with a downlink reference signal corresponding to the PRACH transmission.

[0094] In some example embodiments, determining the transmission power includes the terminal device 110 determining the transmission power based on an ss-PBCH block power associated with a downlink reference signal corresponding to a PRACH transmission.

[0095] In some example embodiments, the PRACH transmission is associated with a contention-free random access procedure.

[0096] Figure 4 FIG. 4 is a flow chart illustrating an example method 400 implemented at a network device according to some example embodiments of the present disclosure. For discussion purposes, Figure 1 Method 400 is described from the perspective of network device 120.

[0097] At block 410, the network device 120 receives a PRACH transmission from the terminal device 110 by a first TRP, the PRACH transmission being triggered via a PDCCH order from a second TRP to the terminal device 110. For the PRACH transmission, a transmission power corresponding to the first TRP is determined.

[0098] In some example embodiments, the first TRP and the second TRP are respectively associated with two different physical cell identifiers PCIs.

[0099] In some example embodiments, the PRACH transmission is associated with a contention-free random access procedure. Example devices, equipment, and media

[0100] In some example embodiments, an apparatus capable of performing any of the methods 300 (e.g., Figure 1 The terminal device 110 in the embodiment may include a component for performing the corresponding operation of the method 300. The component may be implemented in any suitable form. For example, the component may be implemented in a circuit or a software module. The device may be implemented as or included in Figure 1 In the terminal device 110.

[0101] In some example embodiments, the apparatus includes: a component for determining a transmission power corresponding to a physical random access channel (PRACH) transmission to a first transmission reception point (TRP) for a first TRP, wherein the PRACH transmission is triggered via a physical downlink control channel (PDCCH) command from a second TRP to the apparatus; and a component for sending the PRACH transmission to the first TRP using the transmission power.

[0102] In some example embodiments, the first TRP and the second TRP are respectively associated with two different physical cell identifiers PCIs.

[0103] In some example embodiments, the component for determining the transmission power includes: a component for determining the transmission power based on a PRACH target received power corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a control resource set CORESET pool index CORESETPoolIndex associated with the first TRP, or a timing advance group TAG associated with the first TRP.

[0104] In some example embodiments, the means for determining the transmission power includes: means for determining the transmission power based on a path loss corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0105] In some example embodiments, the means for determining the transmission power includes: means for determining the transmission power based on a reference signal power corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0106] In some example embodiments, the means for determining the transmission power based on the reference signal power includes: means for determining the reference signal power based on a synchronization signal-physical broadcast channel ss-PBCH block power corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0107] In some example embodiments, the component for determining the transmission power includes: a component for determining the transmission power based on a higher layer filtered reference signal received power RSRP corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0108] In some example embodiments, the means for determining the transmission power based on the higher layer filtered RSRP includes: means for determining the higher layer filtered RSRP based on a downlink reference signal corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0109] In some example embodiments, the means for determining the transmit power includes means for determining the transmit power based on a higher layer filtered RSRP associated with a downlink reference signal corresponding to the PRACH transmission.

[0110] In some example embodiments, the means for determining the transmit power includes means for determining the transmit power based on an ss-PBCH block power associated with a downlink reference signal corresponding to the PRACH transmission.

[0111] In some example embodiments, the PRACH transmission is associated with a contention-free random access procedure.

[0112] In some example embodiments, the apparatus further comprises means or terminal device 110 for performing other operations in some example embodiments of method 300. In some example embodiments, the means comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to perform operations.

[0113] In some example embodiments, an apparatus capable of performing any of the methods 400 (e.g., Figure 1 The network device 120 in the embodiment may include a component for performing the corresponding operation of the method 400. The component may be implemented in any suitable form. For example, the component may be implemented in a circuit or a software module. The second device may be implemented as or included in Figure 1 In the network device 120.

[0114] In some example embodiments, the apparatus includes a component for receiving a physical random access channel (PRACH) transmission from a terminal device by a first transmission reception point (TRP), the PRACH transmission being triggered via a physical downlink control channel (PDCCH) command from a second TRP to the terminal device, wherein a transmission power corresponding to the first TRP is determined for the PRACH transmission.

[0115] In some example embodiments, the first TRP and the second TRP are respectively associated with two different physical cell identifiers PCIs.

[0116] In some example embodiments, the PRACH transmission is associated with a contention-free random access procedure.

[0117] In some example embodiments, the apparatus further comprises means or network device 120 for performing other operations in some example embodiments of method 400. In some example embodiments, the means comprises: at least one processor; and at least one memory storing instructions that, when executed by the at least one processor, cause execution of the apparatus.

[0118] In some example embodiments, an apparatus includes: at least one processor; and at least one memory storing instructions. The instructions, when executed by the at least one processor, cause the apparatus to at least: determine a transmit power corresponding to a first transmission reception point (TRP) for a Physical Random Access Channel (PRACH) transmission to the first TRP, wherein the PRACH transmission is triggered via a Physical Downlink Control Channel (PDCCH) command from a second TRP to the apparatus; and send the PRACH transmission to the first TRP using the transmit power.

[0119] In some example embodiments, the first TRP and the second TRP are respectively associated with two different physical cell identifiers PCIs.

[0120] In some example embodiments, the apparatus is further configured to determine the transmission power based on a PRACH target receive power corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a control resource set CORESET pool index CORESETPoolIndex associated with the first TRP, or a timing advance group TAG associated with the first TRP.

[0121] In some example embodiments, the apparatus is further configured to determine the transmission power based on a path loss corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0122] In some example embodiments, the apparatus is further configured to determine the transmission power based on a reference signal power corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0123] In some example embodiments, determining the transmission power based on the reference signal power includes determining the reference signal power based on a synchronization signal-physical broadcast channel ss-PBCH block power corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0124] In some example embodiments, the apparatus is further configured to determine the transmission power based on a higher layer filtered reference signal received power RSRP corresponding to at least one of: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0125] In some example embodiments, determining the transmission power based on the higher layer filtered RSRP includes: determining the higher layer filtered RSRP based on a downlink reference signal corresponding to at least one of the following: a PCI associated with the first TRP, the first TRP, a CORESETPoolIndex associated with the first TRP, or a TAG associated with the first TRP.

[0126] In some example embodiments, the apparatus is further caused to determine the transmit power based on a higher layer filtered RSRP associated with a downlink reference signal corresponding to the PRACH transmission.

[0127] In some example embodiments, the apparatus is further caused to determine the transmission power based on an ss-PBCH block power associated with a downlink reference signal corresponding to the PRACH transmission.

[0128] In some example embodiments, the PRACH transmission is associated with a contention-free random access procedure.

[0129] In some example embodiments, an apparatus includes: at least one processor; and at least one memory storing instructions. The instructions, when executed by the at least one processor, cause the apparatus to at least: receive, at a first transmission reception point (TRP), a physical random access channel (PRACH) transmission from a terminal device, the PRACH transmission being triggered via a physical downlink control channel (PDCCH) command from a second TRP to the terminal device, wherein a transmission power corresponding to the first TRP is determined for the PRACH transmission.

[0130] In some example embodiments, the first TRP and the second TRP are respectively associated with two different physical cell identifiers PCIs.

[0131] In some example embodiments, the PRACH transmission is associated with a contention-free random access procedure.

[0132] Figure 5 is a simplified block diagram of a device 500 suitable for implementing an example embodiment of the present disclosure. The device 500 may be provided to implement a communication device, such as Figure 1 The terminal device 110 or the network device 120 is shown. As shown in the figure, the device 500 includes one or more processors 510, one or more memories 520 coupled to the processor 510, and one or more communication modules 540 coupled to the processor 510.

[0133] Communication module 540 is configured for bidirectional communication. Communication module 540 includes one or more communication interfaces to facilitate communication with one or more other modules or devices. A communication interface may represent any interface necessary for communicating with other network elements. In some exemplary embodiments, communication module 540 may include at least one antenna.

[0134] Processor 510 may be of any type suitable for the local technology network and may include one or more of the following: a general purpose computer, a special purpose computer, a microprocessor, a digital signal processor (DSP), and a processor based on a multi-core processor architecture, as non-limiting examples. Device 500 may have multiple processors, such as application specific integrated circuit chips, that are time-slave to a clock synchronized with a main processor.

[0135] The memory 520 may include one or more non-volatile memories and one or more volatile memories. Examples of non-volatile memories include, but are not limited to, read-only memory (ROM) 524, electrically programmable read-only memory (EPROM), flash memory, hard disks, compact discs (CDs), digital video discs (DVDs), optical discs, laser discs, and other magnetic and / or optical storage devices. Examples of volatile memories include, but are not limited to, random access memory (RAM) 522 and other volatile memories that will not persist until power is removed.

[0136] Computer program 530 includes computer-executable instructions executed by associated processor 510. The instructions of program 530 may include instructions for performing the operations / actions of some example embodiments of the present disclosure. Program 530 may be stored in a memory (e.g., ROM 524). Processor 510 may perform any suitable actions and processes by loading program 530 into RAM 522.

[0137] The exemplary embodiments of the present disclosure may be implemented by the program 530 so that the device 500 may execute the procedures described in the reference Figures 2 to 4 Any process of the present disclosure discussed. The exemplary embodiments of the present disclosure may also be implemented by hardware or a combination of software and hardware.

[0138] In some example embodiments, program 530 may be tangibly embodied in a computer-readable medium that may be included in device 500 (such as in memory 520) or in other storage devices accessible by device 500. Device 500 may load program 530 from the computer-readable medium into RAM 522 for execution. In some example embodiments, the computer-readable medium may include any type of non-transitory storage medium, such as ROM, EPROM, flash memory, hard disk, CD, DVD, etc. The term "non-transitory" as used herein is a limitation of the medium itself (i.e., tangible, not a signal), not a limitation on the persistence of data storage (e.g., RAM versus ROM).

[0139] Figure 6 An example of a computer readable medium 600 is shown, which may be in the form of a CD, DVD, or other optical storage disc.The computer readable medium 600 has a program 530 stored thereon.

[0140] In general, various embodiments of the present disclosure may be implemented in hardware or dedicated circuits, software, logic, or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software executed by a controller, microprocessor, or other computing device. Although various aspects of the embodiments of the present disclosure are illustrated and described as block diagrams, flow charts, or using some other graphical representations, it should be understood that, as non-limiting examples, the blocks, devices, systems, techniques, or methods described herein may be implemented in hardware, software, firmware, dedicated circuits or logic, general-purpose hardware or a controller or other computing device, or some combination thereof.

[0141] Some example embodiments of the present disclosure also provide at least one computer program product tangibly stored on a computer-readable medium (such as a non-transitory computer-readable medium). The computer program product includes computer-executable instructions, such as those included in a program module, that are executed in a device on a target entity or virtual processor to perform any of the methods described above. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The functionality of the program modules can be combined or split between program modules as needed in various embodiments. The machine-executable instructions for the program modules can be executed in local or distributed devices. In distributed devices, the program modules can be located in local and remote storage media.

[0142] The program code for performing the method of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general-purpose computer, a special-purpose computer, or other programmable data processing device so that the program code, when executed by the processor or controller, causes the implementation of the functions / operations specified in the flow chart and / or block diagram. The program code can be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0143] In the context of the present disclosure, computer program codes or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform various processes and operations as described above. Examples of carriers include signals, computer-readable media, etc.

[0144] The computer-readable medium can be a computer-readable signal medium or a computer-readable storage medium. The computer-readable medium can include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. More specific examples of computer-readable storage media will include an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0145] In addition, although operations are depicted in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all described operations be performed, to achieve the desired result. In some cases, multitasking and parallel processing can be advantageous. Similarly, although several specific implementation details have been included in the above discussion, these should not be interpreted as limiting the scope of this disclosure, but rather as describing features that may be specific to a particular embodiment. Unless explicitly stated, certain features described in the context of a separate embodiment may also be implemented in combination in a single embodiment. On the contrary, unless explicitly stated, various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable subcombination.

[0146] Although the disclosure has been described in language specific to structural features and / or methodological acts, it is to be understood that the disclosure defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims.

Claims

1. A device comprising: at least one processor; as well as at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: determining a transmission power corresponding to a first transmission reception point (TRP) for a physical random access channel (PRACH) transmission to the first TRP, wherein the PRACH transmission is triggered via a physical downlink control channel (PDCCH) order from a second TRP to the apparatus; as well as The PRACH transmission is sent to the first TRP using the transmission power.

2. The apparatus according to claim 1, wherein the first TRP and the second TRP are respectively associated with two different physical cell identifiers (PCIs).

3. The device according to claim 1 or 2, wherein the device is further configured to: The transmission power is determined based on a PRACH target received power corresponding to at least one of the following: the PCI associated with the first TRP, The first TRP, The control resource set CORESET pool index CORESETPoolIndex associated with the first TRP, or The timing advance group TAG associated with the first TRP.

4. The device according to any one of claims 1 to 3, wherein the device is further configured to: The transmission power is determined based on a path loss corresponding to at least one of the following: the PCI associated with the first TRP, The first TRP, the CORESETPoolIndex associated with the first TRP, or The TAG associated with the first TRP.

5. The device according to any one of claims 1 to 4, wherein the device is further configured to: The transmission power is determined based on a reference signal power corresponding to at least one of the following: the PCI associated with the first TRP, The first TRP, the CORESETPoolIndex associated with the first TRP, or The TAG associated with the first TRP.

6. The apparatus of claim 5 , wherein determining the transmission power based on a reference signal power comprises: The reference signal power is determined based on a synchronization signal-physical broadcast channel ss-PBCH block power corresponding to at least one of the following: the PCI associated with the first TRP, The first TRP, the CORESETPoolIndex associated with the first TRP, or The TAG associated with the first TRP.

7. The device according to any one of claims 1 to 6, wherein the device is further configured to: The transmission power is determined based on a higher layer filtered reference signal received power (RSRP) corresponding to at least one of the following: the PCI associated with the first TRP, The first TRP, the CORESETPoolIndex associated with the first TRP, or The TAG associated with the first TRP.

8. The apparatus of claim 7, wherein determining the transmission power based on higher layer filtered RSRP comprises: The higher layer filtered RSRP is determined based on a downlink reference signal corresponding to at least one of the following: the PCI associated with the first TRP, The first TRP, the CORESETPoolIndex associated with the first TRP, or The TAG associated with the first TRP.

9. The device according to any one of claims 1 to 6, wherein the device is further configured to: The transmit power is determined based on a higher layer filtered RSRP associated with a downlink reference signal corresponding to the PRACH transmission.

10. The device according to any one of claims 1 to 9, wherein the device is further configured to: The transmission power is determined based on an ss-PBCH block power associated with a downlink reference signal corresponding to the PRACH transmission.

11. The apparatus according to any one of claims 1 to 10, wherein the PRACH transmission is associated with a contention-free random access procedure.

12. A device comprising: at least one processor; as well as at least one memory storing instructions that, when executed by the at least one processor, cause the apparatus to at least: A physical random access channel PRACH transmission is received from a terminal device by a first transmission receiving point TRP, and the PRACH transmission is triggered via a physical downlink control channel PDCCH command from a second TRP to the terminal device, wherein for the PRACH transmission, a transmission power corresponding to the first TRP is determined.

13. The apparatus according to claim 12, wherein the first TRP and the second TRP are respectively associated with two different physical cell identifiers (PCIs).

14. The apparatus according to any one of claims 12 to 13, wherein the PRACH transmission is associated with a contention-free random access procedure.

15. A method comprising: determining, at a terminal device, a transmit power corresponding to a first transmission reception point (TRP) for a Physical Random Access Channel (PRACH) transmission to the first TRP, wherein the PRACH transmission is triggered via a Physical Downlink Control Channel (PDCCH) command from a second TRP to the terminal device; as well as The PRACH transmission is sent to the first TRP using the transmission power.

16. A method comprising: At a network device, a physical random access channel PRACH transmission is received from a terminal device by a first transmission receiving point TRP, and the PRACH transmission is triggered via a physical downlink control channel PDCCH command from a second TRP to the terminal device, wherein for the PRACH transmission, a transmission power corresponding to the first TRP is determined. 17 . A non-transitory computer-readable medium comprising program instructions, which, when executed by a device, cause the device to at least perform the method according to claim 15 or the method according to claim 16.

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