Multiple timing advances in multiple transmit / receive points
The system addresses the challenge of multiple TAs in multiple TRPs by enabling multiple beam handling and PL-RS determination for PRACH, enhancing communication efficiency and reliability with multiple TRPs.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2025-05-21
- Publication Date
- 2026-04-09
AI Technical Summary
Existing wireless communication systems face challenges in supporting multiple timing advances (TAs) in multiple transmit/receive points (TRPs), particularly in scenarios where multiple beams are required for physical downlink control channel (PDCCH) transmission, leading to issues in determining pathloss reference signals (PL-RS) and beam selection for random access processes.
The system supports multiple TAs by enabling a UE and network entity to handle multiple joint or downlink indicated beams, with the UE receiving information indicating more than one timing advance groups (TAGs) and transmitting a physical random access channel (PRACH) based on a pathloss reference signal (PL-RS) determined from one of the indicated beams, or synchronization signals, to facilitate efficient communication with multiple TRPs.
This approach allows for efficient and reliable communication with multiple TRPs by accurately determining PL-RS and beam selection, enhancing the capability to handle multiple timing advances, thereby improving communication efficiency and reliability.
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Figure CN2025096340_09042026_PF_FP_ABST
Abstract
Description
MULTIPLE TIMING ADVANCES IN MULTIPLE TRANSMIT / RECEIVE POINTSTECHNICAL FIELD
[0001] The present disclosure relates to wireless communications, and more specifically to a user equipment (UE) , a network entity, a processor for wireless communication, methods, and a computer readable medium for supporting multiple timing advances (TAs) in multiple transmit / receive points (TRPs) .BACKGROUND
[0002] A wireless communication system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. Each network communication devices, such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G)) .
[0003] In 5G specification, 2 timing advances (TAs) is supported in M-DCI (multiple downlink control information) based M-TRP (multiple transmit / receive point) or asymmetric downlink (DL) single-TRP (sTRP) / uplink (UL) multiple TRP (mTRP) scenarios. In these scenarios, only one beam can be used for physical downlink control channel (PDCCH) transmission. According to 5G specification, a PDCCH order triggered physical random access channel (PRACH) is used for TA acquisition, and the pathloss reference signal (PL-RS) of PRACH triggered by the PDCCH order, the beam of random access response (RAR) PDCCH or RAR physical downlink shared channel (PDSCH) is related to the beam of the PDCCH order. Multiple TAs will be supported in multiple TRPs. Issues regarding to random access still need to be further studied.SUMMARY
[0004] Embodiments of the present disclosure are provided to support multiple TAs in multiple TRPs.
[0005] In a first aspect, there is provided a UE. The UE comprises a processor; and a transceiver coupled to the processor, wherein the processor is configured to: receive, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the UE is provided with multiple joint or downlink (DL) indicated beams for the serving cell; receive, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; and transmit, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0006] In a second aspect, there is provided a network entity, comprising: a processor; and a transceiver coupled to the processor, wherein the processor is configured to: transmit, to a user equipment (UE) , information indicating more than one timing advance groups (TAGs) for a serving cell, wherein multiple joint or downlink (DL) indicated beams for the serving cell are indicated to the UE; transmit, to the UE, a physical downlink control channel (PDCCH) order via more than one beams; and receive, from the UE, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0007] In a third aspect, there is provided a processor for wireless communication. The a processor comprise at least one memory; and a controller coupled with the at least one memory and configured to cause the controller to: receive, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the processor is provided with multiple joint or downlink (DL) indicated beams for the serving cell; receive, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; and transmit, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0008] In a fourth aspect, there is provided method performed by a user equipment (UE) , the method comprising: receiving, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the UE is provided with multiple joint or downlink (DL) indicated beams for the serving cell; receiving, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; and transmitting, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0009] In a fifth aspect, there is provided method performed by a network entity, the method comprising: transmitting, to a user equipment (UE) , information indicating more than one timing advance groups (TAGs) for a serving cell, wherein multiple joint or downlink (DL) indicated beams for the serving cell are indicated to the UE; transmitting, to the UE, a physical downlink control channel (PDCCH) order via more than one beams; and receiving, from the UE, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0010] In a sixth aspect, there is provided a computer readable medium having instructions stored thereon, the instructions, when executed by a processor of an apparatus, causing the apparatus to perform the method according to the fourth or the fifth aspect of the disclosure.
[0011] In some implementations of the methods, the UE and the network entity, the PL-RS of the PRACH is determined according to a first beam of the more than one beams of the PDCCH order based on one or more of the following: when a PRACH association indicator is not present in the PDCCH order, or when a cell indicator field in the PDCCH order is not present or has value 0, or when a value of the PRACH association indicator field in the PDCCH order is 0 if the UE is not provided SSB-MTC-AdditionalPCI, or when the PRACH association indicator field in the PDCCH order indicates a physCellId associated with a cell of the PDCCH order reception.
[0012] In some implementations of the methods, the UE and the network entity, the PL-RS of the PRACH is determined according to the SSB indicated by the PDCCH order based on one or more of the following: when transmission of the PRACH is on a non-serving cell indicated by a cell indicator field in the PDCCH order, or when a value of a PRACH association indicator field in the PDCCH order is 1 if the UE is not provided SSB-MTC-AdditionalPCI, or when the PRACH association indicator field in the PDCCH order indicates a physCellId that is different than the physCellId associated with a cell of the PDCCH order reception.
[0013] In some implementations of the methods, the UE and the network entity, a beam of a PDCCH with downlink control information (DCI) format 1_0 with cyclic redundancy check (CRC) scrambled by a corresponding radio access network temporary identifier (RA-RNTI) in response to the PRACH transmission is determined as a first beam of a control resource set (CORESET) or a search space set where the PDCCH is transmitted; or one or more beams of a PDCCH with DCI format 1_0 with CRC scrambled by the corresponding RA-RNTI in response to the PRACH transmission are determined as one or more beams of the CORESET or the search space set if PDCCHs in all common search space (CSS) set are capable with reception with multiple beams.
[0014] In some implementations of the methods, the UE and the network entity, in a case that the serving cell is a special cell (SpCell) and a CORESET where the PDCCH order is transmitted is associated with a physical cell identifier (ID) for the serving cell, a beam of a PDCCH with DCI format 1_0 with CRC scrambled by a corresponding RA-RNTI in response to the PRACH transmission is determined as a first beam of the more than one beams of the PDCCH order; or one or more beams of a PDCCH with DCI format 1_0 with CRC scrambled by the corresponding RA-RNTI in response to the PRACH transmission are determined as one or more beams of the PDCCH order if PDCCHs in all CSS set are capable with reception with multiple beams.
[0015] In some implementations of the methods, the UE and the network entity, in a case that the serving cell is a SpCell and a CORESET where the PDCCH order is transmitted is not associated with a physical cell ID for the serving cell, a beam of a PDCCH with DCI format 1_0 with CRC scrambled by a corresponding RA-RNTI in response to the PRACH transmission is determined as a first beam of the CORESET; or one or more beams of a PDCCH with DCI format 1_0 with CRC scrambled by the corresponding RA-RNTI in response to the PRACH transmission are determined as one or more beams of the CORESET if PDCCHs in all CSS set are capable with reception with multiple beams.
[0016] In some implementations of the methods, the UE and the network entity, the UE may determine one or more beams for a physical downlink shared channel (PDSCH) scheduled with an RA-RNTI in response to the PRACH.
[0017] In some implementations of the methods, the UE and the network entity, in a case that more than one CORESETPoolIndex values are configured in the serving cell and one or more indicated beams of the more than one indicated beams are associated with each of all the configured CORESETPoolIndex values, and when applyIndicatedTCI-StateDCI-1-0 is not configured: a beam of the PDSCH is determined as a first one of the one or more indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order; or one or more beams of the PDSCH are determined as the one or more indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order.
[0018] In some implementations of the methods, the UE and the network entity, in a case that more than one CORESETPoolIndex values are configured in the serving cell and one or more indicated beams of the more than one indicated beams are associated with each of all the configured CORESETPoolIndex values, and when applyIndicatedTCI-StateDCI-1-0 is configured: a beam of the PDSCH is determined as a first indicated beam indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order; or one or more beams of the PDSCH are determined as one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order.
[0019] In some implementations of the methods, the UE and the network entity, in a case that one CORESETPoolIndex value is configured or no CORESETPoolIndex value is configured in the serving cell, and when applyIndicatedTCI-StateDCI-1-0 is not configured: a beam of the PDSCH is determined as a first indicated beam of the more than one joint or DL indicated beams in the serving cell; or beams of the PDSCH are determined as all of the more than one joint or DL indicated beams in the serving cell.
[0020] In some implementations of the methods, the UE and the network entity, in a case that one CORESETPoolIndex value is configured or no CORESETPoolIndex value is configured in the serving cell, and when applyIndicatedTCI-StateDCI-1-0 is configured: a beam of the PDSCH is determined as a first indicated beam indicated by applyIndicatedTCI-StateDCI-1-0 of the more than one indicated beams in the serving cell; or one or more beams of the PDSCH are determined as all of one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of the more than one indicated beams in the serving cell.
[0021] In some implementations of the methods, the UE and the network entity, the serving cell is a SpCell and a CORESET where the PDCCH order is transmitted is not associated with a physical cell ID for the serving cell.
[0022] In some implementations of the methods, the UE and the network entity, in a case the serving cell is SpCell and a CORESET where the PDCCH order is transmitted is associated with the physical cell ID for the serving cell, a beam of the PDSCH is determined as a first beam of the PDCCH order; or one or more beams of the PDSCH are determined as one or more beams of the PDCCH order.
[0023] In some implementations of the methods, the UE and the network entity, a beam of a PDCCH with DCI format 1_0 with CRC scrambled by a corresponding RA-RNTI in response to the PRACH transmission is indicated by the PDCCH order as one of the more than one joint or DL indicated beams.
[0024] In some implementations of the methods, the UE and the network entity, a beam of a PDSCH scheduled with RA-RNTI in response to the PRACH is indicated by the PDCCH order as one of the more than one joint or DL indicated beams.BRIEF DESCRIPTION OF THE DRAWINGS
[0025] FIG. 1 illustrates an example of a wireless communications system in which some embodiments of the present disclosure can be implemented.
[0026] FIG. 2 illustrates an example of a process flow for supporting multiple TAs in multiple TRPs in accordance with some example embodiments of the present disclosure.
[0027] FIG. 3 illustrates an example of a device that is suitable for implementing some embodiments of the present disclosure.
[0028] FIG. 4 illustrates an example of a processor that is suitable for implementing some embodiments of the present disclosure.
[0029] FIG. 5 illustrates a flowchart of a method performed by a user equipment in accordance with aspects of the present disclosure.
[0030] FIG. 6 illustrates a flowchart of a method performed by a network entity in accordance with aspects of the present disclosure.
[0031] Throughout the drawings, the same or similar reference numerals represent the same or similar elements.DETAILED DESCRIPTION
[0032] Principles of the present disclosure will now be described with reference to some embodiments. It is to be understood that these embodiments are described only for the purpose of illustration and help those skilled in the art to understand and implement the present disclosure, without suggesting any limitation as to the scope of the disclosure. The disclosure described herein can be implemented in various manners other than the ones described below. 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 skills in the art to which this disclosure belongs.
[0033] References in the present disclosure to “one embodiment, ” “an example embodiment, ” “an embodiment, ” “some embodiments, ” and the like indicate that the embodiment (s) described may include a particular feature, structure, or characteristic, but it is not necessary that every embodiment includes the particular feature, structure, or characteristic. Moreover, such phrases do not necessarily refer to the same embodiment (s) . Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.
[0034] It shall be understood that although the terms “first” and “second” or the like 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 element. For example, a first element could also be termed as a second element, and similarly, a second element could also be termed as a first element, without departing from the scope of embodiments. As used herein, the term “and / or” includes any and all combinations of one or more of the listed terms. In some examples, values, procedures, or apparatuses are referred to as “best, ” “lowest, ” “highest, ” “minimum, ” “maximum, ” or the like. It will be appreciated that such descriptions are intended to indicate that a selection among many used functional alternatives can be made, and such selections need not be better, smaller, higher, or otherwise preferable to other selections.
[0035] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of embodiments. As used herein, the singular forms “a, ” “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises, ” “comprising, ” “has, ” “having, ” “includes” and / or “including, ” when used herein, specify the presence of stated features, elements, components and / or the like, but do not preclude the presence or addition of one or more other features, elements, components and / or combinations thereof. For example, the term “includes” and its variants are to be read as open terms that mean “includes, but is not limited to. ” The term “based on” is to be read as “based at least in part on. ” The term “one embodiment” and “an embodiment” are to be read as “at least one embodiment. ” The term “another embodiment” is to be read as “at least one other embodiment. ” The use of an expression such as “Aand / or B” can mean either “only A” or “only B” or “both A and B. ” Other definitions, explicit and implicit, may be included below.
[0036] One or more beams for a serving cell can be indicated by the network (NW) to a UE, for example, via a Medium Access Control Control Element (MAC-CE) and / or Downlink Control Information (DCI) . An indicated beam can be a joint-indicated beam in the joint Transmission Configuration Indicator (TCI) state mode, a downlink (DL) -indicated beam for DL transmission, or an uplink (UL) -indicated beam for UL transmission in the separate TCI state mode.
[0037] In the joint TCI state mode, when M (M > 1) joint-indicated beams are indicated to the UE, one indicated beam corresponds to one transmit / receive point (TRP) among M TRPs. In the separate TCI state mode, when M DL-indicated beams and M UL-indicated beams are indicated to the UE, one DL-indicated beam and one UL-indicated beam each correspond to one of the M TRPs.
[0038] If M CORESETPoolIndex values are configured, the configuration corresponds to an M-DCI-based M-TRP scenario. If N (1 < N < M) CORESETPoolIndex values are configured, the configuration corresponds to a combination of an S-DCI-based scenario and an M-DCI-based M-TRP scenario. If no CORESETPoolIndex or only one CORESETPoolIndex value is configured, the configuration corresponds to a S-DCI-based M-TRP scenario. In the M-DCI-based M-TRP scenario, only one beam can be applied to a PDCCH. In contrast, in the S-DCI-based M-TRP scenario or in the combined S-DCI and M-DCI-based M-TRP scenario, multiple beams can be applied to a PDCCH.
[0039] The timing advance (TA) of each TA group (TAG) of multiple TAGs of a serving cell can be obtained by a PDCCH order triggered PRACH. According to the legacy specification or agreement, the pathloss reference signal (PL-RS) of physical random access channel (PRACH) triggered by the PDCCH order is related to the beam of the PDCCH order, and the beam of random access response (RAR) PDSCH and PDSCH is also related to PDCCH order.
[0040] In Release-18, the 2-TA solution is only supported for M-DCI based M-TRP scenarios, while in Release-19, the 2-TA solution is only supported for asymmetric DL sTRP / UL mTRP scenarios. In the two cases, only one beam can be applied for PDCCH order. However, in the future, multiple TAs may be supported in more than one TRPs and the number of beam (s) of PDCCH order can be more than one. For example, in 6G, more than 2 TRPs can serve a UE simultaneously, besides, S-DCI based M-TRP, M-DCI based M-TRP and the combination of S-DCI based and M-DCI based M-TRP scenarios can be supported with more than 2 TRPs in 6G.
[0041] In such a case, issues regarding how to determine the PL-RS of PRACH and the beam (s) of RAR PDCCH and PDSCH need to be studied. In the following, embodiments of the present disclosure are provided to address the noted issues.
[0042] Aspects of the present disclosure are described in the context of a wireless communications system. FIG. 1 illustrates an example of a wireless communications system 100 in which some embodiments of the present disclosure can be implemented. The wireless communications system 100 may include one or more network entities 102 (also referred to as network equipment (NE) ) , one or more UEs 104, a core network 106, and a packet data network 108. The wireless communications system 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE-Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a 5G network, such as an NR network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi) , IEEE 802.16 (WiMAX) , IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0043] The one or more network entities 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the network entities 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a radio access network (RAN) , a base transceiver station, an access point, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. A network entity 102 and a UE 104 may communicate via a communication link 110, which may be a wireless or wired connection. For example, a network entity 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface. In a 3GPP non-terrestrial network (NTN) , a network entity 102 in form of a satellite can directly communicate to UE 104 using NR / LTE Uu interface. The satellite may be a transparent satellite or a regenerative satellite. For NTN with a transparent satellite, a base station on earth may communicate with a UE via the satellite. For NTN with a regenerative satellite, the base station may be on board and directly communicate with the UE.
[0044] A network entity 102 may provide a geographic coverage area 112 for which the network entity 102 may support services (e.g., voice, video, packet data, messaging, broadcast, etc. ) for one or more UEs 104 within the geographic coverage area 112. For example, a network entity 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc. ) according to one or multiple radio access technologies. In some implementations, a network entity 102 may be moveable, for example, a satellite associated with a non-terrestrial network. In some implementations, different geographic coverage areas 112 associated with the same or different radio access technologies may overlap, but the different geographic coverage areas 112 may be associated with different network entities 102. Information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.
[0045] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a mobile device, a wireless device, a remote device, a remote unit, a handheld device, or a subscriber device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an Internet-of-Things (IoT) device, an Internet-of-Everything (IoE) device, or machine-type communication (MTC) device, among other examples. In some implementations, a UE 104 may be stationary in the wireless communications system 100. In some other implementations, a UE 104 may be mobile in the wireless communications system 100. In some other implementations, a UE 104 may be a UAV UE and may communicate with one or more network entities 102 while flying.
[0046] The one or more UEs 104 may be devices in different forms or having different capabilities. Some examples of UEs 104 are illustrated in FIG. 1. A UE 104 may be capable of communicating with various types of devices, such as the network entities 102, other UEs 104, or network equipment (e.g., the core network 106, the packet data network 108, a relay device, an integrated access and backhaul (IAB) node, or another network equipment) , as shown in FIG. 1. Additionally, or alternatively, a UE 104 may support communication with other network entities 102 or UEs 104, which may act as relays in the wireless communications system 100.
[0047] A UE 104 may also be able to support wireless communication directly with other UEs 104 over a communication link 114. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link 114 may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.
[0048] A network entity 102 may support communications with the core network 106, or with another network entity 102, or both. For example, a network entity 102 may interface with the core network 106 through one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The network entities 102 may communicate with each other over the backhaul links 116 (e.g., via an X2, Xn, or another network interface) . In some implementations, the network entities 102 may communicate with each other directly (e.g., between the network entities 102) . In some other implementations, the network entities 102 may communicate with each other or indirectly (e.g., via the core network 106) . In some implementations, one or more network entities 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC) . An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or TRPs.
[0049] In some implementations, a network entity 102 may be configured in a disaggregated architecture, which may be configured to utilize a protocol stack physically or logically distributed among two or more network entities 102, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration sponsored by the O-RAN Alliance) , or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN) ) . For example, a network entity 102 may include one or more of a central unit (CU) , a distributed unit (DU) , a radio unit (RU) , a RAN Intelligent Controller (RIC) (e.g., a Near-Real Time RIC (Near-RT RIC) , a Non-Real Time RIC (Non-RT RIC) ) , a Service Management and Orchestration (SMO) system, or any combination thereof.
[0050] An RU may also be referred to as a radio head, a smart radio head, a remote radio head (RRH) , a remote radio unit (RRU) , or a transmission reception point (TRP) . One or more components of the network entities 102 in a disaggregated RAN architecture may be co-located, or one or more components of the network entities 102 may be located in distributed locations (e.g., separate physical locations) . In some implementations, one or more network entities 102 of a disaggregated RAN architecture may be implemented as virtual units (e.g., a virtual CU (VCU) , a virtual DU (VDU) , a virtual RU (VRU)) .
[0051] Split of functionality between a CU, a DU, and an RU may be flexible and may support different functionalities depending upon which functions (e.g., network layer functions, protocol layer functions, baseband functions, radio frequency functions, and any combinations thereof) are performed at a CU, a DU, or an RU. For example, a functional split of a protocol stack may be employed between a CU and a DU such that the CU may support one or more layers of the protocol stack and the DU may support one or more different layers of the protocol stack. In some implementations, the CU may host upper protocol layer (e.g., a layer 3 (L3) , a layer 2 (L2) ) functionality and signaling (e.g., Radio Resource Control (RRC) , service data adaption protocol (SDAP) , Packet Data Convergence Protocol (PDCP) ) . The CU may be connected to one or more DUs or RUs, and the one or more DUs or RUs may host lower protocol layers, such as a layer 1 (L1) (e.g., physical (PHY) layer) or an L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160.
[0052] Additionally, or alternatively, a functional split of the protocol stack may be employed between a DU and an RU such that the DU may support one or more layers of the protocol stack and the RU may support one or more different layers of the protocol stack. The DU may support one or multiple different cells (e.g., via one or more RUs) . In some implementations, a functional split between a CU and a DU, or between a DU and an RU may be within a protocol layer (e.g., some functions for a protocol layer may be performed by one of a CU, a DU, or an RU, while other functions of the protocol layer are performed by a different one of the CU, the DU, or the RU) .
[0053] A CU may be functionally split further into CU control plane (CU-CP) and CU user plane (CU-UP) functions. A CU may be connected to one or more DUs via a midhaul communication link (e.g., F1, F1-c, F1-u) , and a DU may be connected to one or more RUs via a fronthaul communication link (e.g., open fronthaul (FH) interface) . In some implementations, a midhaul communication link or a fronthaul communication link may be implemented in accordance with an interface (e.g., a channel) between layers of a protocol stack supported by respective network entities 102 that are in communication via such communication links.
[0054] The core network 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The core network 106 may be an evolved packet core (EPC) , or a 5G core (5GC) , which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME) , an access and mobility management functions (AMF) ) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW) , a Packet Data Network (PDN) gateway (P-GW) , or a user plane function (UPF) ) . In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc. ) for the one or more UEs 104 served by the one or more network entities 102 associated with the core network 106.
[0055] The core network 106 may communicate with the packet data network 108 over one or more backhaul links 116 (e.g., via an S1, N2, N2, or another network interface) . The packet data network 108 may include an application server 118. In some implementations, one or more UEs 104 may communicate with the application server 118. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the core network 106 via a network entity 102. The core network 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 118 using the established session (e.g., the established PDU session) . The PDU session may be an example of a logical connection between the UE 104 and the core network 106 (e.g., one or more network functions of the core network 106) .
[0056] In the wireless communications system 100, the network entities 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) ) to perform various operations (e.g., wireless communications) . In some implementations, the network entities 102 and the UEs 104 may support different resource structures. For example, the network entities 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the network entities 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the network entities 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The network entities 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0057] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a subcarrier spacing and a cyclic prefix. A first numerology (e.g., μ=0) may be associated with a first subcarrier spacing (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., μ=0) associated with the first subcarrier spacing (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., μ=1) may be associated with a second subcarrier spacing (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., μ=2) may be associated with a third subcarrier spacing (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., μ=3) may be associated with a fourth subcarrier spacing (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., μ=4) may be associated with a fifth subcarrier spacing (e.g., 240 kHz) and a normal cyclic prefix.
[0058] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames) . Each frame may have a duration, for example, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.
[0059] Additionally or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., μ=0, μ=1, μ=2, μ=3, μ=4) associated with respective subcarrier spacings of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., OFDM symbols) . In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz subcarrier spacing) , a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., μ=0) associated with a first subcarrier spacing (e.g., 15 kHz) may be used interchangeably between subframes and slots.
[0060] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (310 MHz –7.125 GHz) , FR2 (24.25 GHz –52.6 GHz) , FR3 (7.125 GHz –24.25 GHz) , FR4 (52.6 GHz –114.25 GHz) , FR4a or FR4-1 (52.6 GHz –71 GHz) , and FR5 (114.25 GHz –300 GHz) . In some implementations, the network entities 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the network entities 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g., control information, data) . In some implementations, FR2 may be used by the network entities 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0061] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies) . For example, FR1 may be associated with a first numerology (e.g., μ=0) , which includes 15 kHz subcarrier spacing; a second numerology (e.g., μ=1) , which includes 30 kHz subcarrier spacing; and a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies) . For example, FR2 may be associated with a third numerology (e.g., μ=2) , which includes 60 kHz subcarrier spacing; and a fourth numerology (e.g., μ=3) , which includes 120 kHz subcarrier spacing.
[0062] FIG. 2 illustrates an example of a process flow for supporting multiple TAs in multiple TRPs in accordance with some example embodiments of the present disclosure. The process flow 200 may involve a UE 201 and a network entity (e.g. a TRP, or a base station including one or more TRPs) 202. The process flow 200 may be applied to the wireless communications system 100 with reference to FIG. 1, for example, the UE 201 may be any of UEs 104, and the network entity 202 may be any of the network entities 102. It would be appreciated that the process flow 200 may be applied to other communication scenarios.
[0063] At 210, the network entity 202 transmits, to the UE 201, information 215 indicating more than one TAGs for a serving cell, wherein the UE 201 is provided with multiple joint or downlink (DL) indicated beams for the serving cell. Correspondingly, at 220, the UE 201 receives information 215 from the network entity 202.
[0064] At 230, the network entity 202 transmits, to the UE 201, a PDCCH order 235 via more than one beams. Correspondingly, at 240, the UE 201 receives the PDCCH order 235 from the network entity 202. For example, when the network entity 202 wants the UE 201 to perform random access (e.g., due to beam failure recovery, timing alignment, or UL synchronization) , it can send the PDCCH order 235 to the UE 201. The PDCCH order 235 instructs the UE 201 to start a PRACH procedure.
[0065] At 250, the UE 201 transmits, to the network entity 201, a PRACH 255 triggered by the PDCCH order based on a PL-RS. Correspondingly, at 260, the network entity 202 receives the PRACH 255 from the UE 201.
[0066] Upon reception of the PDCCH order 235, the UE 201 may determine a PL-RS of the PRACH 255 triggered by the PDCCH order 235, estimate the pathloss between itself and the network entity 202 based on the PL-RS, and then determine the transmit power for the PRACH.
[0067] The PL-RS may be determined according to one of the more than one beams of the PDCCH order. Alternatively, the PL-RS may be determined according to a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order. Alternatively, the PL-RS may be determined according to a beam indicated by the PDCCH order from the multiple joint or DL indicated beams that are indicted to the UE 201.
[0068] In some embodiments, the PL-RS of the PRACH may be determined according to one (e.g., the first beam) of the more than one beams of the PDCCH order. A DL RS which is associated with the first beam of the PDCCH order may be used as the PL-RS of the PRACH triggered by the PDCCH order. The DL RS used as the PL-RS of the PRACH may be a DL RS which is quasi-co-located (QCLed) with the first beam or a PL-RS of the first beam.
[0069] In some embodiments, the PL-RS of the PRACH may be determined according to one (e.g., the first beam) of the more than one beams of the PDCCH order based on one or more of the following: ■ when the PRACH association indicator is not present in the PDCCH order, or ■ when the cell indicator field in the PDCCH order is not present or has value 0, or ■ when a value of a PRACH association indicator field in the PDCCH order is 0 if the UE is not provided SSB-MTC-AdditionalPCI, or ■ when the PRACH association indicator field in the PDCCH order indicates a physCellId associated with the cell of the PDCCH order reception.
[0070] A control resource set (CORESET) can be configured or configured with multiple beams, and the beam (s) of the PDCCH order may be the beam (s) of the CORESET where the PDCCH order is transmitted. For example, the CORESET of the PDCCH order may be configured or indicated with two beams (e.g., TCI state 3 and TCI state 2) , then the first beam is the first configured or indicated beam of the CORESET which is TCI state 3. Alternatively, the beam for PL-RS determination can also be any of the beams configured in the CORESET, for example, the beam with the lowest / highest beam index.
[0071] Alternatively, the PL-RS of the PRACH is determined according to SSB indicated by the PDCCH order. In some embodiments, the SSB indicated by the PDCCH order may be always used as the PL-RS for the PRACH. The pathloss offset may be applied for the pathloss calculation for the case that PRACH is transmitted to a UL only TRP according to a field in the PDCCH order.
[0072] In some embodiments, the SSB indicated by the PDCCH order may be used as the PL RS for the PRACH based on one or more of the following: ■ when the PRACH transmission is on a non-serving cell indicated by the cell indicator field in the PDCCH order, or ■ when a value of a PRACH association indicator field in the PDCCH order is 1 if the UE is not provided SSB-MTC-AdditionalPCI, or ■ when the PRACH association indicator field in the PDCCH order indicates a physCellId that is different than the physCellId associated with the cell of the PDCCH order reception
[0073] Alternatively, the PL-RS may be determined according to a beam of the more than one joint or DL indicated beams indicated by the PDCCH order. A DL RS which is associated with one joint or DL indicated beam of M joint or DL indicated beam which is indicated by a field in the PDCCH order may be used as the PL-RS of the PRACH triggered by the PDCCH order. The PL-RS of the PRACH can be a DL RS which is QCLed with a joint or DL indicated beam indicated by the PDCCH order or a PL-RS of the joint or DL indicated beam. For example, ceil (log2 (M) ) bits of reserved bits of the PDCCH order may be used for the beam indication for the PL-RS, wherein M is the number of joint or DL indicated beams in the serving cell, and ceil () is the ceiling function.
[0074] With reference to FIG. 2, at 270, the network entity 202 transmits, to the UE 201, a random access response (RAR) PDCCH 275 in response to the PRACH transmission 255. Correspondingly, at 280, the UE 201 receives the RAR PDCCH 275 from the network entity 202. The RAR PDCCH 275 schedules an RAR message on the PDSCH using DCI Format 1_0 and is identified using a temporary radio access network temporary identifier (RA-RNTI) .
[0075] At 290, the network entity 202 transmits a scheduled RAR PDSCH 295 to the UE 201. Correspondingly, at 292, the UE 201 receives the RAR PDSCH 295 from the network entity 202. The RAR PDSCH 295 may include one TA of multiple TAs for the UE 201 to adjust its uplink timing so that UL transmissions arrive correctly aligned at each of the multiple TRPs of the network entity 202.
[0076] In some embodiments, the UE 201 may determine one or more beams of an RAR PDCCH 275 in response to the PRACH 255. In the following, issues regarding the beam determination of the RAR PDCCH 275 are discussed in detail.
[0077] The RAR PDCCH refers to a PDCCH with DCI format 1_0 with cyclic redundancy check (CRC) scrambled by the corresponding RA-RNTI and it is transmitted in a dedicated search space set which is Type1-PDCCH common search space (CSS) set. In this disclosure, only the beam determination of RAR PDCCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure for multiple TA in multiple TRP is considered.
[0078] In some embodiments, the beam (s) of the RAR PDCCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure is always determined according to the beam (s) of the CORESET or search space set where the RAR PDCCH is transmitted. Note that only one beam which is the first beam of the CORESET where a search space set is associated can be used for the PDCCHs in CSS set except for Type3-PDCCH CSS set in 5G specification.
[0079] In some embodiments, beam is configured per CORESET which follows 5G specification, and thus the beam (s) of the RAR PDCCH can be determined based on the CORESET where the RAR PDCCH is transmitted.
[0080] If PDCCHs in all CSS set are capable with reception with multiple beams where it is configured by radio resource control (RRC) which may be according to a UE capability reported to gNB, then the beam (s) of RAR PDCCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure is determined as the beam (s) of the CORESET where the RAR PDCCH is transmitted (Type1-PDCCH CSS set is associated) . In this case, the number of beam (s) of RAR PDCCH is same to the number of beam (s) of the CORESET where the RAR PDCCH is transmitted.
[0081] If PDCCHs in Type1-PDCCH CSS set is not capable with reception with multiple beams, then the beam of RAR PDCCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure is determined as one (e.g., the first beam) of the CORESET where the RAR PDCCH is transmitted (Type1-PDCCH CSS set is associated) . In this case, the number of beam (s) of the CORESET where RAR PDCCH is transmitted can be 1 or more while the number of beam of RAR PDSCH is always 1.
[0082] In some embodiments, beam is configured per search space set, and thus the beam (s) of the RAR PDCCH can be determined based on the search space set where the RAR PDCCH is transmitted.
[0083] In this case, the beam (s) of RAR PDCCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure is determined as the beam (s) of the search space set where the RAR PDCCH is associated.
[0084] In some embodiments, if the RAR PDCCH is in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure for a special cell (SpCell) and multiple TAGs is configured for the SpCell and the CORESET where the UE receives the PDCCH order that triggers a contention-free random access procedure for the SpCell is associated with the physical cell ID for the serving cell, the beam (s) of the RAR PDCCH is determined as follows.
[0085] If PDCCHs in all CSS set are capable with reception with multiple beams where it is configured by RRC which may be according to a UE capability reported to gNB, the beam (s) of the RAR PDCCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined as the beam (s) of the PDCCH order.
[0086] If PDCCHs in Type1-PDCCH CSS set is not capable with reception with multiple beams, then the beam of RAR PDCCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure is determined as one of the beams of the PDCCH order, e.g., the first beam of the PDCCH order.
[0087] In some embodiments, if RAR PDCCH is in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure for SpCell and if multiple TAGs is configured for SpCell and the CORESET where the UE receives the PDCCH order that triggers a contention-free random access procedure for SpCell is not associated with the physical cell ID for the serving cell, the beam (s) of the RAR PDCCH may be determined based on the CORESET or the search space set where the RAR PDCCH is transmitted, as discussed above.
[0088] In some embodiments, the beam of the RAR PDCCH with DCI format 1_0 with CRC scrambled by a corresponding RA-RNTI in response to the PRACH transmission may be indicated by the PDCCH order as one of the more than one joint or DL indicated beams. A field in the PDCCH order may be used to indicate one joint or DL indicated beam for the RAR PDCCH. For example, ceil (log2 (M) ) bits of reserved bits of the PDCCH order may be used for the beam indication for the RAR PDCCH, wherein M is the number of joint or DL indicated beams in the serving cell, and ceil () is the ceiling function.
[0089] In some embodiments, the UE 201 may determine one or more beams of the RAR PDSCH 295 scheduled with an RA-RNTI in response to the PRACH 255. In the following, issues regarding the beam determination of the RAR PDSCH 295 are discussed in detail.
[0090] The RAR PDSCH refers to a PDSCH scheduled with RA-RNTI in response to a random access procedure. In this disclosure, only the beam determination of RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure for multiple TAs in multiple TRPs is considered.
[0091] In some embodiments, the beam (s) of the RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined according to the beam determination for PDSCH scheduled by DCI format 1_0.
[0092] When more than one CORESETPoolIndex values are configured, and one or more indicated beams are associated with each of all the configured CORESETPoolIndex values (i.e., M-DCI based M-TRP scenario, or combination of S-DCI based scenario and M-DCI based M-TRP scenario) , the beams (s) of the RAR PDSCH may be determined based on whether a parameter which indicates beam (s) for PDSCH scheduled or activated by a fallback DL DCI such as DCI format 1_0 (It can be named as applyIndicatedTCI-StateDCI-1-0) is configured.
[0093] If applyIndicatedTCI-StateDCI-1-0 is not configured, the beam of the RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined as a first indicated beam associated with the CORESETPoolIndex value where the corresponding RAR PDCCH (i.e., PDCCH scheduling the RAR PDSCH) is associated. Alternatively, the beam (s) of the RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined as the indicated beam (s) associated with the CORESETPoolIndex value where the corresponding RAR PDCCH (PDCCH scheduling the RAR PDSCH) is associated.
[0094] If applyIndicatedTCI-StateDCI-1-0 is configured and one or more indicated beams are indicated by applyIndicatedTCI-StateDCI-1-0, the beam of the RAR PDSCH may be determined as one (e.g., the first beam) of the one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams associated with the CORESETPoolIndex value where the corresponding RAR PDCCH (PDCCH scheduling the RAR PDSCH) is associated. Alternatively, the beam (s) of the RAR PDSCH may be determined as the one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams associated with the CORESETPoolIndex value where the corresponding RAR PDCCH (PDCCH scheduling the RAR PDSCH) is associated.
[0095] When only one CORESETPoolIndex value is configured or no CORESETPoolIndex value is configured (i.e., S-DCI based M-TRP scenario) , the beams (s) of the RAR PDSCH may be determined based on whether the parameter applyIndicatedTCI-StateDCI-1-0 is configured.
[0096] If applyIndicatedTCI-StateDCI-1-0 is not configured, the beam of the RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined as a first indicated beam of all the indicated beams in the serving cell. Alternatively, the beam (s) of the RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined as all the indicated beams in the serving cell.
[0097] If applyIndicatedTCI-StateDCI-1-0 is configured and one or more indicated beams are indicated by applyIndicatedTCI-StateDCI-1-0, the beam of the RAR PDSCH may be determined as one (e.g., the first beam) of the one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams in the serving cell. Alternatively, the beam (s) of the RAR PDSCH may be determined as the one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams in the serving cell.
[0098] In some embodiments, the serving cell is a special cell (SpCell) , and if multiple TAGs are configured for the SpCell and the CORESET where the UE receives the PDCCH order is associated with the physical cell ID of the serving cell, then the beam (s) of the RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure for the SpCell may be determined as follows.
[0099] The beam of RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined as one of the beams of the PDCCH order, e.g., the first beam of the PDCCH order. Alternatively, the beam (s) of RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure may be determined as the beam (s) of the PDCCH order.
[0100] In some embodiments, the serving cell is SpCell, and if multiple TAGs are configured for the SpCell and the CORESET where the UE receives the PDCCH order is not associated with the physical cell ID of the serving cell, then the beam (s) of the RAR PDSCH in response to a PRACH transmission initiated by a PDCCH order that triggers a contention-free random access procedure for the SpCell may be determined according to the beam determination for PDSCH scheduled by DCI format 1_0, as discussed above. This means that the beam of RAR PDSCH is determined according to the beam determination for PDSCH scheduled by DCI format 1_0, the number of CORESETSETPoolIndex values and applyIndicatedTCI-StateDCI-1-0.
[0101] In some embodiments, a beam of the RAR PDSCH scheduled with RA-RNTI in response to the PRACH may be indicated by the PDCCH order as one of the more than one joint or DL indicated beams. A field in the PDCCH order may be used to indicate one joint or DL indicated beam for the RAR PDSCH. For example, ceil (log2 (M) ) bits of reserved bits of the PDCCH order may be used for the beam indication for the RAR PDSCH, wherein M is the number of joint or DL indicated beams in the serving cell, and ceil () is the ceiling function.
[0102] FIG. 4 illustrates an example of a device that is suitable for implementing some embodiments of the present disclosure. The device 300 may be an example of a UE 104 or network entity 102 as described herein. The device 300 may support wireless communication with one or more network entities 102, UEs 104, or any combination thereof. The device 300 may include components for bi-directional communications including components for transmitting and receiving communications, such as a processor 302, a memory 304, a transceiver 306, and, optionally, an I / O controller 308. These components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0103] The processor 302, the memory 304, the transceiver 306, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. For example, the processor 302, the memory 304, the transceiver 306, or various combinations or components thereof may support a method for performing one or more of the operations described herein.
[0104] In some implementations, the processor 302, the memory 304, the transceiver 306, or various combinations or components thereof may be implemented in hardware (e.g., in communications management circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure. In some implementations, the processor 302 and the memory 304 coupled with the processor 302 may be configured to perform one or more of the functions described herein (e.g., executing, by the processor 302, instructions stored in the memory 304) .
[0105] For example, the processor 302 may support wireless communication at the device 300 in accordance with examples as disclosed herein. The device 300 may be an example of a UE 104. In this case, the processor 302 may be configured to operable to support means for receiving, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the UE is provided with multiple joint or downlink (DL) indicated beams for the serving cell; means for receiving, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; and means for transmitting, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0106] The device 300 may be an example of a network entity 102, e.g. a network entity. In this case, the processor 302 may be configured to operable to support means for transmitting, to a user equipment (UE) , information indicating more than one timing advance groups (TAGs) for a serving cell, wherein multiple joint or downlink (DL) indicated beams for the serving cell are indicated to the UE; means for transmitting, to the UE, a physical downlink control channel (PDCCH) order via more than one beams; and means for receiving, from the UE, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0107] The processor 302 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof) . In some implementations, the processor 302 may be configured to operate a memory array using a memory controller. In some other implementations, a memory controller may be integrated into the processor 302. The processor 302 may be configured to execute computer-readable instructions stored in a memory (e.g., the memory 304) to cause the device 300 to perform various functions of the present disclosure.
[0108] The memory 304 may include random access memory (RAM) and read-only memory (ROM) . The memory 304 may store computer-readable, computer-executable code including instructions that, when executed by the processor 302 cause the device 300 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. In some implementations, the code may not be directly executable by the processor 302 but may cause a computer (e.g., when compiled and executed) to perform functions described herein. In some implementations, the memory 304 may include, among other things, a basic I / O system (BIOS) which may control basic hardware or software operation such as the interaction with peripheral components or devices.
[0109] The I / O controller 308 may manage input and output signals for the device 300. The I / O controller 308 may also manage peripherals not integrated into the device 300. In some implementations, the I / O controller 308 may represent a physical connection or port to an external peripheral. In some implementations, the I / O controller 308 may utilize an operating system such as or another known operating system. In some implementations, the I / O controller 308 may be implemented as part of a processor, such as the processor 302. In some implementations, a user may interact with the device 300 via the I / O controller 308 or via hardware components controlled by the I / O controller 308.
[0110] In some implementations, the device 300 may include a single antenna 310. However, in some other implementations, the device 300 may have more than one antenna 310 (i.e., multiple antennas) , including multiple antenna panels or antenna arrays, which may be capable of concurrently transmitting or receiving multiple wireless transmissions. The transceiver 306 may communicate bi-directionally, via the one or more antennas 310, wired, or wireless links as described herein. For example, the transceiver 306 may represent a wireless transceiver and may communicate bi-directionally with another wireless transceiver. The transceiver 306 may also include a modem to modulate the packets, to provide the modulated packets to one or more antennas 310 for transmission, and to demodulate packets received from the one or more antennas 310. The transceiver 306 may include one or more transmit chains, one or more receive chains, or a combination thereof.
[0111] A transmit chain may be configured to generate and transmit signals (e.g., control information, data, packets) . The transmit chain may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM) , frequency modulation (FM) , or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM) . The transmit chain may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmit chain may also include one or more antennas 310 for transmitting the amplified signal into the air or wireless medium.
[0112] A receive chain may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receive chain may include one or more antennas 310 for receive the signal over the air or wireless medium. The receive chain may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receive chain may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receive chain may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0113] FIG. 4 illustrates an example of a processor 400 is suitable for implementing some embodiments of the present disclosure. The processor 400 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 400 may include a controller 402 configured to perform various operations in accordance with examples as described herein. The processor 400 may optionally include at least one memory 404. Additionally, or alternatively, the processor 400 may optionally include one or more arithmetic-logic units (ALUs) 406. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses) .
[0114] The processor 400 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 400) or other memory (e.g., random access memory (RAM) , read-only memory (ROM) , dynamic RAM (DRAM) , synchronous dynamic RAM (SDRAM) , static RAM (SRAM) , ferroelectric RAM (FeRAM) , magnetic RAM (MRAM) , resistive RAM (RRAM) , flash memory, phase change memory (PCM) , and others) .
[0115] The controller 402 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 400 to cause the processor 400 to support various operations in accordance with examples as described herein. For example, the controller 402 may operate as a control unit of the processor 400, generating control signals that manage the operation of various components of the processor 400. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0116] The controller 402 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 304 and determine subsequent instruction (s) to be executed to cause the processor 400 to support various operations in accordance with examples as described herein. The controller 402 may be configured to track memory address of instructions associated with the memory 404. The controller 402 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 402 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 400 to cause the processor 400 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 402 may be configured to manage flow of data within the processor 400. The controller 402 may be configured to control transfer of data between registers, arithmetic logic units (ALUs) , and other functional units of the processor 400.
[0117] The memory 404 may include one or more caches (e.g., memory local to or included in the processor 400 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementation, the memory 404 may reside within or on a processor chipset (e.g., local to the processor 400) . In some other implementations, the memory 404 may reside external to the processor chipset (e.g., remote to the processor 400) .
[0118] The memory 404 may store computer-readable, computer-executable code including instructions that, when executed by the processor 400, cause the processor 400 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 402 and / or the processor 400 may be configured to execute computer-readable instructions stored in the memory 304 to cause the processor 400 to perform various functions. For example, the processor 400 and / or the controller 402 may be coupled with or to the memory 304, the processor 400, the controller 402, and the memory 304 may be configured to perform various functions described herein. In some examples, the processor 400 may include multiple processors and the memory 404 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.
[0119] The one or more ALUs 406 may be configured to support various operations in accordance with examples as described herein. In some implementation, the one or more ALUs 406 may reside within or on a processor chipset (e.g., the processor 400) . In some other implementations, the one or more ALUs 406 may reside external to the processor chipset (e.g., the processor 400) . One or more ALUs 406 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 406 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 406 be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 406 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 406 to handle conditional operations, comparisons, and bitwise operations.
[0120] The processor 400 may support wireless communication in accordance with examples as disclosed herein. The processor 400 may implemented at a UE 104. In this case, the processor 400 may be configured to operable to support means for receiving, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the processor is provided with multiple joint or downlink (DL) indicated beams for the serving cell; means for receiving, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; and means for transmitting, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0121] The processor 400 may be implemented at a network entity 102, e.g. a base station. In this case, the processor 400 may be configured to operable to support means for transmitting, to a user equipment (UE) , information indicating more than one timing advance groups (TAGs) for a serving cell, wherein multiple joint or downlink (DL) indicated beams for the serving cell are indicated to the UE; means for transmitting, to the UE, a physical downlink control channel (PDCCH) order via more than one beams; and means for receiving, from the UE, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
[0122] FIG. 5 illustrates a flowchart of a method 500 performed by a UE in accordance with aspects of the present disclosure. The operations of the method 500 may be implemented by a device or its components as described herein. For example, the operations of the method 500 may be performed by a UE 104 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0123] At 510, the method may include receiving, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the UE is provided with multiple joint or downlink (DL) indicated beams for the serving cell The operations of 510 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 510 may be performed by a UE 104 as described with reference to FIG. 1.
[0124] At 520, the method may include receiving, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams. The operations of 520 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 520 may be performed by a UE 104 as described with reference to FIG. 1.
[0125] At 530, the method may include transmitting, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) . The operations of 530 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 530 may be performed by a UE 104 as described with reference to FIG. 1.
[0126] FIG. 6 illustrates a flowchart of a method 600 performed by a network entity in accordance with aspects of the present disclosure. The operations of the method 600 may be implemented by a device or its components as described herein. For example, the operations of the method 600 may be performed by a network entity 102 as described herein. In some implementations, the device may execute a set of instructions to control the function elements of the device to perform the described functions. Additionally, or alternatively, the device may perform aspects of the described functions using special-purpose hardware.
[0127] At 610, the method may transmitting, to a user equipment (UE) , information indicating more than one timing advance groups (TAGs) for a serving cell, wherein multiple joint or downlink (DL) indicated beams for the serving cell are indicated to the UE. The operations of 610 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 610 may be performed by a network entity 102 as described with reference to FIG. 1.
[0128] At 620, the method may include transmitting, to the UE, a physical downlink control channel (PDCCH) order via more than one beams. The operations of 620 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 620 may be performed by a network entity 102 as described with reference to FIG. 1.
[0129] At 630, the method may include receiving, from the UE, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) , wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams. The operations of 630 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 630 may be performed by a network entity 102 as described with reference to FIG. 1.
[0130] It should be noted that the methods described herein describes possible implementations, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, aspects from two or more of the methods may be combined.
[0131] The various illustrative blocks and components described in connection with the disclosure herein may be implemented or performed with a general-purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
[0132] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted over as one or more instructions or code on a computer-readable medium. Other examples and implementations are within the scope of the disclosure and appended claims. For example, due to the nature of software, functions described herein may be implemented using software executed by a processor, hardware, firmware, hardwiring, or combinations of any of these. Features implementing functions may also be physically located at various positions, including being distributed such that portions of functions are implemented at different physical locations.
[0133] Computer-readable media includes both non-transitory computer storage media and communication media including any medium that facilitates transfer of a computer program from one place to another. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer. By way of example, non-transitory computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM) , flash memory, compact disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that may be used to carry or store desired program code means in the form of instructions or data structures and that may be accessed by a general-purpose or special-purpose computer, or a general-purpose or special-purpose processor.
[0134] As used herein, including in the claims, an article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a, ” “at least one, ” “one or more, ” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of” or “one or more of” or “one or both of” ) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C) . Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on. Further, as used herein, including in the claims, a “set” may include one or more elements.
[0135] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.
Claims
1.A user equipment (UE) comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:receive, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the UE is provided with multiple joint or downlink (DL) indicated beams for the serving cell;receive, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; andtransmit, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) ,wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.2.The UE of claim 1, wherein the PL-RS of the PRACH is determined according to a first beam of the more than one beams of the PDCCH order based on one or more of the following:when a PRACH association indicator is not present in the PDCCH order, orwhen a cell indicator field in the PDCCH order is not present or has value 0, orwhen a value of the PRACH association indicator field in the PDCCH order is 0 if the UE is not provided SSB-MTC-AdditionalPCI, orwhen the PRACH association indicator field in the PDCCH order indicates a physCellId associated with a cell of the PDCCH order reception.3.The UE of claim 1, wherein the PL-RS of the PRACH is determined according to the SSB indicated by the PDCCH order based on one or more of the following:when transmission of the PRACH is on a non-serving cell indicated by a cell indicator field in the PDCCH order, orwhen a value of a PRACH association indicator field in the PDCCH order is 1 if the UE is not provided SSB-MTC-AdditionalPCI, orwhen the PRACH association indicator field in the PDCCH order indicates a physCellId that is different than the physCellId associated with a cell of the PDCCH order reception.4.The UE of claim 1, whereina beam of a PDCCH with downlink control information (DCI) format 1_0 with cyclic redundancy check (CRC) scrambled by a corresponding radio access network temporary identifier (RA-RNTI) in response to the PRACH transmission is determined as a first beam of a control resource set (CORESET) or a search space set where the PDCCH is transmitted; orone or more beams of a PDCCH with DCI format 1_0 with CRC scrambled by the corresponding RA-RNTI in response to the PRACH transmission are determined as one or more beams of the CORESET or the search space set if PDCCHs in all common search space (CSS) set are capable with reception with multiple beams.5.The UE of claim 1, wherein in a case that the serving cell is a special cell (SpCell) and a CORESET where the PDCCH order is transmitted is associated with a physical cell identifier (ID) for the serving cell,a beam of a PDCCH with DCI format 1_0 with CRC scrambled by a corresponding RA-RNTI in response to the PRACH transmission is determined as a first beam of the more than one beams of the PDCCH order; orone or more beams of a PDCCH with DCI format 1_0 with CRC scrambled by the corresponding RA-RNTI in response to the PRACH transmission are determined as one or more beams of the PDCCH order if PDCCHs in all CSS set are capable with reception with multiple beams.6.The UE of claim 1, wherein in a case that the serving cell is a SpCell and a CORESET where the PDCCH order is transmitted is not associated with a physical cell ID for the serving cell,a beam of a PDCCH with DCI format 1_0 with CRC scrambled by a corresponding RA-RNTI in response to the PRACH transmission is determined as a first beam of the CORESET; orone or more beams of a PDCCH with DCI format 1_0 with CRC scrambled by the corresponding RA-RNTI in response to the PRACH transmission are determined as one or more beams of the CORESET if PDCCHs in all CSS set are capable with reception with multiple beams.7.The UE of claim 1, wherein the processor is further configured to:determine one or more beams for a physical downlink shared channel (PDSCH) scheduled with an RA-RNTI in response to the PRACH.8.The UE of claim 7, wherein in a case that more than one CORESETPoolIndex values are configured in the serving cell and one or more indicated beams of the more than one indicated beams are associated with each of all the configured CORESETPoolIndex values, andwhen applyIndicatedTCI-StateDCI-1-0 is not configured,a beam of the PDSCH is determined as a first one of the one or more indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order; orone or more beams of the PDSCH are determined as the one or more indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order.9.The UE of claim 7, wherein in a case that more than one CORESETPoolIndex values are configured in the serving cell and one or more indicated beams of the more than one indicated beams are associated with each of all the configured CORESETPoolIndex values, andwhen applyIndicatedTCI-StateDCI-1-0 is configured,a beam of the PDSCH is determined as a first indicated beam indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order; orone or more beams of the PDSCH are determined as one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of all indicated beams associated with a CORESETPoolIndex value associated with the PDCCH order.10.The UE of claim 7, wherein in a case that one CORESETPoolIndex value is configured or no CORESETPoolIndex value is configured in the serving cell, andwhen applyIndicatedTCI-StateDCI-1-0 is not configured,a beam of the PDSCH is determined as a first indicated beam of the more than one joint or DL indicated beams in the serving cell; orbeams of the PDSCH are determined as all of the more than one joint or DL indicated beams in the serving cell.11.The UE of claim 7, wherein in a case that one CORESETPoolIndex value is configured or no CORESETPoolIndex value is configured in the serving cell, andwhen applyIndicatedTCI-StateDCI-1-0 is configured,a beam of the PDSCH is determined as a first indicated beam indicated by applyIndicatedTCI-StateDCI-1-0 of the more than one indicated beams in the serving cell; orone or more beams of the PDSCH are determined as all of one or more indicated beams indicated by applyIndicatedTCI-StateDCI-1-0 of the more than one indicated beams in the serving cell.12.The UE of any of claims 8-11, wherein the serving cell is a SpCell and a CORESET where the PDCCH order is transmitted is not associated with a physical cell ID for the serving cell.13.The UE of claim 7, wherein in a case the serving cell is SpCell and a CORESET where the PDCCH order is transmitted is associated with the physical cell ID for the serving cell,a beam of the PDSCH is determined as a first beam of the PDCCH order; orone or more beams of the PDSCH are determined as one or more beams of the PDCCH order.14.The UE of claim 1, wherein a beam of a PDCCH with DCI format 1_0 with CRC scrambled by a corresponding RA-RNTI in response to the PRACH transmission is indicated by the PDCCH order as one of the more than one joint or DL indicated beams.15.The UE of claim 1, wherein a beam of a PDSCH scheduled with RA-RNTI in response to the PRACH is indicated by the PDCCH order as one of the more than one joint or DL indicated beams.16.A network entity comprising:a processor; anda transceiver coupled to the processor,wherein the processor is configured to:transmit, to a user equipment (UE) , information indicating more than one timing advance groups (TAGs) for a serving cell, wherein multiple joint or downlink (DL) indicated beams for the serving cell are indicated to the UE;transmit, to the UE, a physical downlink control channel (PDCCH) order via more than one beams; andreceive, from the UE, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) ,wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.17.The network entity of claim 16, wherein the PL-RS of the PRACH is determined according to a first beam of the more than one beams of the PDCCH order based on one or more of the following:when a PRACH association indicator is not present in the PDCCH order, orwhen a cell indicator field in the PDCCH order is not present or has value 0, orwhen a value of the PRACH association indicator field in the PDCCH order is 0 if the UE is not provided SSB-MTC-AdditionalPCI, orwhen the PRACH association indicator field in the PDCCH order indicates a physCellId associated with a cell of the PDCCH order reception.18.The network entity of claim 16, wherein the PL-RS of the PRACH is determined according to the SSB indicated by the PDCCH order based on one or more of the following:when transmission of the PRACH is on a non-serving cell indicated by a cell indicator field in the PDCCH order, orwhen a value of a PRACH association indicator field in the PDCCH order is 1 if the UE is not provided SSB-MTC-AdditionalPCI, orwhen the PRACH association indicator field in the PDCCH order indicates a physCellId that is different than the physCellId associated with a cell of the PDCCH order reception.19.A processor for wireless communication, comprising:at least one memory; anda controller coupled with the at least one memory and configured to cause the controller to:receive, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the processor is provided with multiple joint or downlink (DL) indicated beams for the serving cell;receive, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; andtransmit, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) ,wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.20.A method performed by a user equipment (UE) , the method comprising:receiving, from a network entity, information indicating more than one timing advance groups (TAGs) for a serving cell, wherein the UE is provided with multiple joint or downlink (DL) indicated beams for the serving cell;receiving, from the network entity, a physical downlink control channel (PDCCH) order via more than one beams; andtransmitting, to the network entity, a physical random access channel (PRACH) triggered by the PDCCH order based on a pathloss reference signal (PL-RS) ,wherein the PL-RS is determined according to one of the more than one beams of the PDCCH order, or a Synchronization Signal / physical broadcast channel Block (SSB) indicated by the PDCCH order, or a beam indicated by the PDCCH order from the multiple joint or DL indicated beams.
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