Method and apparatus for scell activation and dynamic measurement configuration change
The solution for managing SCell activation and dynamic measurement configurations in wireless communication systems addresses inefficiencies in advanced radio access technologies by using LTM candidate configurations and synchronization signals to enhance network performance and resource utilization.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- LENOVO (BEIJING) LTD
- Filing Date
- 2025-07-16
- Publication Date
- 2026-06-11
Smart Images

Figure CN2025108831_11062026_PF_FP_ABST
Abstract
Description
METHOD AND APPARATUS FOR SCELL ACTIVATION AND DYNAMIC MEASUREMENT CONFIGURATION CHANGETECHNICAL FIELD
[0001] Embodiments of the present disclosure relate generally to wireless communication technology, and more particularly to the activation of secondary cells (SCells) configured in a layer 1 / layer 2 triggered mobility (LTM) scenario and dynamic measurement configuration change.BACKGROUND
[0002] A wireless communication system may include one or multiple network communication devices, such as base stations (BSs) , which may support wireless communication for one or multiple user communication devices, which may be otherwise known as UE, or other suitable terminology. The wireless communication system may support wireless communication 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, or the like) . Additionally, the wireless communication system may support wireless communication across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) (which is also known as new radio (NR) ) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) .SUMMARY
[0003] 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” , a “group” or a “list” may include one or more elements.
[0004] Some embodiments of the present disclosure provide a UE. The UE may include at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive, from a BS, configuration information including at least one of a layer 1 (L1) measurement configuration, a layer 3 (L3) measurement configuration or an LTM candidate configuration for at least one candidate cell; receive, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate identifiers (IDs) associated with the report configuration; and transmit, to the BS, a measurement report based on the configuration information and the indication.
[0005] Some embodiments of the present disclosure provide a BS. The BS may include at least one memory; and at least one processor coupled with the at least one memory and configured to cause the BS to: transmit, to a UE, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; transmit, to the UE, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and receive, from the UE, a measurement report based on the configuration information and the indication.
[0006] Some embodiments of the present disclosure provide a processor. The processor may include at least one controller coupled with at least one memory and configured to cause the processor to: receive, from a BS, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; receive, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and transmit, to the BS, a measurement report based on the configuration information and the indication.
[0007] Some embodiments of the present disclosure provide a processor. The processor may include at least one controller coupled with at least one memory and configured to cause the processor to: transmit, to a UE, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; transmit, to the UE, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and receive, from the UE, a measurement report based on the configuration information and the indication.
[0008] Some embodiments of the present disclosure provide a method for wireless communication. The method may include: receiving, from a BS, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; receiving, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and transmitting, to the BS, a measurement report based on the configuration information and the indication.
[0009] Some embodiments of the present disclosure provide a method for wireless communication. The method may include: transmit, to a UE, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; transmit, to the UE, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and receiving, from the UE, a measurement report based on the configuration information and the indication.
[0010] Some embodiments of the present disclosure provide an apparatus. According to some embodiments of the present disclosure, the apparatus may include: at least one non-transitory computer-readable medium having stored thereon computer-executable instructions; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the at least one non-transitory computer-readable medium and the computer executable instructions may be configured to, with the at least one processor, cause the apparatus to perform a method according to some embodiments of the present disclosure.BRIEF DESCRIPTION OF THE DRAWINGS
[0011] In order to describe the manner in which the advantages and features of the disclosure can be obtained, a description of the disclosure is rendered by reference to specific embodiments thereof, which are illustrated in the appended drawings. These drawings depict only exemplary embodiments of the disclosure and are not therefore to be considered limiting of its scope.
[0012] FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present disclosure;
[0013] FIGs. 2 and 3 illustrate exemplary procedures related to SCell activation in accordance with some embodiments of the present disclosure;
[0014] FIG. 4 illustrates an exemplary procedures related to dynamic measurement configuration change in accordance with some embodiments of the present disclosure;
[0015] FIGs. 5 and 6 illustrate flowcharts of wireless communication methods in accordance with some embodiments of the present disclosure;
[0016] FIG. 7 illustrates an example of a UE in accordance with some embodiments of the present disclosure;
[0017] FIG. 8 illustrates an example of a processor in accordance with some embodiments of the present disclosure; and
[0018] FIG. 9 illustrates an example of network equipment (NE) in accordance with some embodiments of the present disclosure.DETAILED DESCRIPTION
[0019] The detailed description of the appended drawings is intended as a description of the preferred embodiments of the present disclosure and is not intended to represent the only form in which the present disclosure may be practiced. It should be understood that the same or equivalent functions may be accomplished by different embodiments that are intended to be encompassed within the spirit and scope of the present disclosure.
[0020] Reference will now be made in detail to some embodiments of the present disclosure, examples of which are illustrated in the accompanying drawings. To facilitate understanding, embodiments are provided under a specific network architecture (s) and new service scenarios, such as the 3rd generation partnership project (3GPP) 5G NR or 6G, 3GPP LTE, and so on. It is contemplated that along with the development of network architectures and new service scenarios, all embodiments in the present disclosure are also applicable to similar technical problems; and moreover, the terminologies recited in the present disclosure may change, which should not affect the principles of the present disclosure.
[0021] LTM is a procedure in which a network equipment receives an L1 measurement report and / or L3 measurement report from a UE, and the network equipment changes the UE’s serving cell by a cell switch command indicating a candidate cell configuration which has been configured to UE in advance. An LTM candidate configuration may configure a candidate cell and optionally one or more SCells. The present disclosure provides solutions for activating or deactivating the configured candidate SCells. In addition, solutions for dynamic measurement configuration indication are provided.
[0022] FIG. 1 illustrates a schematic diagram of wireless communication system 100 in accordance with some embodiments of the present disclosure.
[0023] The wireless communication system 100 may include one or more NEs 102 (e.g., one or more BSs) , one or more UEs 104, and a core network (CN) 106. The wireless communication system 100 may support various radio access technologies. In some implementations, the wireless communication 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 communication system 100 may be an NR network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultra-wideband (5G-UWB) network. In other implementations, the wireless communication 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) , and IEEE 802.20. The wireless communication system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communication system 100 may support technologies, such as time division multiple access (TDMA) , frequency division multiple access (FDMA) , or code division multiple access (CDMA) , etc.
[0024] The one or more NEs 102 may be dispersed throughout a geographic region to form the wireless communication system 100. One or more of the NEs 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN) node, a NodeB, an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. In some implementations, the one or more NEs 102 may include different types of BSs (e.g., macro BS, pico BS, femto BS, relay BS, etc. ) . These different types of BSs may have different transmit power levels and different coverage areas. For example, a macro BS may have a relatively high transmit power level, while pico BSs, femto BSs, and relay BSs may have a relatively low transmit power levels. In some embodiments of the present disclosure, an NE 102 may include a CU and one or more DUs. An F1 interface or an F1-like interface may be established between the DU of NE 102 and the CU of NE 102.
[0025] An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.
[0026] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 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, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN) . 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 may be associated with a different NE 102.
[0027] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communication system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, a receiver 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.
[0028] A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. 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.
[0029] A relaying function based on a sidelink may be supported in the wireless communication system 100. For example, a UE 104 supporting sidelink communication may function as a relay node to extend the coverage of an NE 102 (e.g., a BS) . An out-of-coverage or in-coverage UE may communicate with a BS via a relay node (e.g., a relay UE) . In some implementations, a UE, which functions as a relay between another UE and a BS, may be referred to as a UE-to-network (U2N) relay.
[0030] An NE 102 may support communication with the CN 106, or with another NE 102 or both. For example, an NE 102 may interface with another NE 102 or the CN 106 through one or more backhaul links (e.g., S1, N2, N3 or another network interface) . In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other indirectly (e.g., via the CN 106) . In some implementations, one or more NEs 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 radio heads, smart radio heads, or transmission-reception points (TRPs) .
[0031] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 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 function (AMF) ) functions 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 NEs 102 associated with the CN 106.
[0032] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an S1, N2, N3, or another network interface) . The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server 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 CN 106 (e.g., one or more network functions of the CN 106) .
[0033] In the wireless communication system 100, the NEs 102 and the UEs 104 may use resources of the wireless communication 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 communication) . In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 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 NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures) . The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.
[0034] One or more numerologies may be supported in the wireless communication system 100, and a numerology may include 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. A sixth numerology (e.g., μ =5) may be associated with a sixth subcarrier spacing (e.g., 480 kHz) and a normal cyclic prefix. A seventh numerology (e.g., μ=6) may be associated with a seventh subcarrier spacing (e.g., 960 kHz) and a normal cyclic prefix. For ambient IoT communication, additional numerologies (e.g., μ=-1 or μ =-2) may be introduced corresponding to 7.5 kHz or 3.75 kHz, respectively.
[0035] 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.
[0036] 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 communication 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 (SCSs) 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., orthogonal frequency-division multiplexing (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.
[0037] In the wireless communication 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 communication system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 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 NEs 102 and the UEs 104 may perform wireless communication over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communication traffic (e.g., control information, data) . In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.
[0038] 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 two 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.
[0039] A UE 104 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like. According to some embodiments of the present disclosure, a UE 104 may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network. In some embodiments of the present disclosure, a UE 104 includes wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like. Moreover, a UE 104 may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art. A UE 104 may communicate with an NE 102 (e.g., a BS) via uplink (UL) communication signals. An NE 102 may communicate with a UE 104 via downlink (DL) communication signals.
[0040] In some embodiments of the present disclosure, an NE 102 and a UE 104 may communicate over licensed spectrums, whereas in some other embodiments, an NE 102 and a UE 104 may communicate over unlicensed spectrums. The present disclosure is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol. Persons skilled in the art should understand that as technology develops and advances, the terminologies described in the present disclosure may change, but should not affect or limit the principles and spirit of the present disclosure.
[0041] In some embodiments, a UE may access the network via single connectivity, where it connects to a single cell group (e.g., master cell group (MCG) only) configured by the serving BS. This single cell group may include a primary cell (PCell) and optionally one or more SCells. In some embodiments, a UE may access the network via multi-connectivity (e.g., via dual connectivity (DC) ) . In DC, the UE may access the network via an MCG managed by a master node (MN) and a secondary cell group (SCG) managed by a secondary node (SN) . The MCG may include a PCell and optional SCells, and the SCG may include a primary secondary cell (PSCell) and optional SCells. The PCell (in MCG) and PSCell (in SCG) may be jointly termed special cell (SpCell) . In some embodiments, the MN and SN are deployed as separate physical BSs. In some embodiments, the MN and SN may be collocated within the same BS. For example, in a CU-DU split architecture, the MN and SN may correspond to different DUs under the same CU. In some embodiments, the MN and SN may correspond to different DUs under different CUs.
[0042] LTM is a procedure in which a network equipment (e.g., a BS such as a gNB or a RAN node in 6G) receives an L1 measurement report and / or L3 measurement report from a UE, and the network equipment (e.g., a BS) changes the UE’s serving cell by a cell switch command. The cell switch command may indicate an LTM candidate configuration that the network equipment previously prepared and provided to the UE through, for example, RRC signaling. Then, the UE switches to the target cell via applying the target configuration indicated by the cell switch command.
[0043] In some embodiments, an LTM candidate configuration may configure a candidate cell (e.g., an SpCell) and optionally one or more SCells. Embodiments of the present disclosure provide solutions for activating or deactivating the configured candidate SCells of the LTM candidate configuration in the case of L3 measurement-based LTM. For example, solutions are provided for managing various timers associated with the activated SCells. Embodiments of the present disclosure also provide solutions for supporting dynamic measurement configuration indication. For example, solutions are provided for handling L1 measurement and L1 event evaluation when supporting dynamic measurement configuration indication. More details on the embodiments of the present disclosure will be illustrated in the following text in combination with the appended drawings.
[0044] FIG. 2 illustrates exemplary procedure 200 related to SCell activation in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 2.
[0045] Referring to FIG. 2, UE 204 may connect to (or access) BS 202. For example, UE 204 may access a cell of BS 202, whereby this cell can be referred to as the "serving cell" of UE 204 and BS 202 can be referred to as the "serving BS" of UE 204. In some embodiments, UE 204 may access the network via single connectivity and BS 202 is associated with the MCG of UE 204. For example, UE 204 may access the network via MCG only in a stand-alone mode. In some embodiments, UE 204 may access the network via multi-connectivity (e.g., via DC) . For example, in addition to BS 202, UE 204 may connect to another BS (denoted as BS #A) . In some examples, BS 202 and BS #A may be respectively associated with the MCG and SCG of UE 204, and thus may be respectively referred to as an MN and an SN of UE 204. In some examples, BS 202 and BS #A may be respectively associated with the SCG and MCG of UE 204, and thus may be respectively referred to as an SN and an MN of UE 204. In some embodiments, BS 202 may include a CU and at least one DU.
[0046] At 211, UE 204 may transmit UE capability information (e.g., a capability related message) to BS 202. In some examples, the UE capability information is transmitted in response to a request from BS 202. In some examples, the request for UE capability information may be transmitted from the MN and the UE capability information may be transmitted to the MN. In some examples, the request for UE capability information may be transmitted from the SN and the UE capability information may be transmitted to the SN.
[0047] In some embodiments, the UE capability information may include first information indicating whether UE 204 supports activating or deactivating a candidate SCell configured in radio access technologies beyond 5G (e.g., 6G radio (6GR) ) . In some embodiments, the UE capability information may include second information indicating whether UE 204 supports activating or deactivating a candidate SCell in the case of L3 measurement-based LTM. In some embodiments, the UE capability information may include third information indicating whether UE 204 supports activating a candidate SCell with an LTM cell switch. In some embodiments, the UE capability information may include fourth information indicating whether UE 204 supports activating a candidate SCell via a MAC CE. In some embodiments, the UE capability information may include fifth information indicating whether UE 204 supports activating a candidate SCell that belongs to the same or different TAG as the candidate SpCell. In some embodiments, the UE capability information may include one or more of the first information to fifth information.
[0048] In some embodiments, BS 202 (e.g., the CU of BS 202) may determine to prepare an LTM candidate cell for UE 204 and perform an LTM candidate preparation procedure at 213. BS 202, the CU of BS 202 and the DU of BS 202 may also be referred to as the source BS, the source CU and the source DU, respectively. In the case of inter-BS (e.g., inter-CU) LTM, BS 202 (e.g., the CU of BS 202) may transmit a request message (e.g., a handover request) for an LTM candidate cell to a candidate BS (denoted as BS #B, not shown in FIG. 2) . BS #B may include a CU and at least one DU. For example, BS 202 may perform the LTM candidate preparation procedure with BS #B. During the LTM candidate preparation procedure, BS 202 (e.g., the CU of BS 202) may transmit a request message for an LTM candidate cell to BS #B (e.g., the CU of BS #B) . In the case of intra-BS (e.g., intra-CU) LTM, the signaling between BS 202 and BS #B (e.g., the handover request as well as the corresponding response which will be described below) can be omitted. For example, the CU of BS 202 can transmit the request for an LTM candidate cell to the candidate DU directly via the F1 interface or F1-like interface. The candidate DU may then perform similar operations as the DU of BS #B as described below. The candidate DU can transmit the response to the CU of BS 202 directly via the F1 interface or F1-like interface.
[0049] In some embodiments, the request message may include information related to subsequent LTM. This means that the prepared LTM candidate should support subsequent LTM. In some examples, the UE capability information of UE 204 may be transmitted to BS #B. For example, UE capability related to SCell activation may be transmitted to BS #B.
[0050] Either the MN or the SN can determine to prepare an LTM candidate cell for UE 204. For example, in the case of MCG LTM, the MN may transmit the request to a candidate MN. In the case of SCG LTM, the MN may transmit the request to a candidate SN after the SN requests the MN to prepare a candidate cell (e.g., a candidate SCG or a candidate PSCell) .
[0051] In response to receiving the request message from BS 202, the CU of BS #B may transmit a request message (e.g., a UE context setup request message) to a candidate DU (denoted as DU #B1) of BS #B. In some embodiments, the request message may include a list of SCells to be set up. If DU #B1 succeeds in establishing the UE context, it may reply to the CU of BS #B with a response message (e.g., a UE context setup response message) . In the case of intra-BS (e.g., intra-CU) , the CU of BS 202 may transmit the request message to a candidate DU, which belongs to BS 202 and transmits the response message to the CU of BS 202.
[0052] For example, if DU #B1 determines to accept the request for LTM configuration related to a candidate cell (i.e., a candidate SpCell such as a candidate PCell or PSCell) , DU #B1 may respond to the CU of BS #B with a response message including RRC configuration for the accepted target candidate cell. In some embodiments, DU #B1 may respond a list of SCells that failed to set up in the response message.
[0053] In response to receiving the response message from DU #B1, the CU of BS #B may transmit a response message to BS 202 (e.g., the CU of BS 202) in response to the request message for an LTM candidate cell from BS 202. In some embodiments, the CU of BS #B may transmit an LTM candidate configuration to BS 202 (e.g., the CU of BS 202) . For example, the response message to BS 202 (e.g., the CU of BS 202) may include a container for the LTM candidate configuration.
[0054] In some embodiments, the LTM candidate configuration may be associated with an LTM candidate cell (e.g., an SpCell) and one or more SCells. For example, in the case of MCG LTM, the LTM candidate configuration may indicate information for a candidate PCell and one or more candidate SCells. In the case of SCG LTM, the LTM candidate configuration may indicate information for a candidate PSCell and one or more candidate SCells. In some embodiments, the LTM candidate configuration may include an LTM candidate ID, which can identify the LTM candidate configuration. In this sense, persons skilled in the art can understand that an LTM candidate configuration or an LTM candidate ID can be associated with an LTM candidate cell (e.g., SpCell, which is a PCell for MCG or a PSCell for SCG) and one or more SCells.
[0055] In some embodiments, the response message to BS 202 (e.g., the CU of BS 202) may include a list of the one or more SCells associated with the LTM candidate configuration. For convenience, this list is hereinafter referred to as List #A. List #A may be generated by the CU of BS #B and provided independent of the container for the LTM candidate configuration. List #A may include one or more of the following information: (1) an association between the SCell index of each of the one or more SCells and the cell ID of the LTM candidate cell (e.g., the candidate PCell or the candidate PSCell) ; (2) an association between the SCell index of each of the one or more SCells and one of an LTM candidate ID and a target configuration index; and (3) at least one RS configuration for each of the one or more SCells. The cell ID of an LTM candidate cell may refer to a physical cell identifier (PCI) , NR cell global identifier (NCGI) or the like. In some examples, the above information (1) - (3) may only be applicable to MCG LTM. In some examples, the above information (1) - (3) may be applicable to both MCG LTM and SCG LTM. In the case of DC, the candidate SN will provide the above information to the source SN via the source MN. A target configuration index can be mapped to an LTM candidate ID. For example, the value of the target configuration index may be equal to the value of the LTM candidate ID minus 1. In this sense, the target configuration index can identify an LTM candidate configuration. In some embodiments, the at least one RS configuration may be at least one RS (e.g., synchronization signal block (SSB) or channel state information RS (CSI-RS) ) resource set. In some embodiments, information (3) may indicate an association between the RS configuration and the SCell index of the corresponding SCell.
[0056] In response to receiving the response message from the candidate BS, the CU of BS 202 may transmit a request for a modification purpose (e.g., a UE context modification request message) to the DU of BS 202.
[0057] In some embodiments, the DU of BS 202 should be aware of the SCell configuration. The DU of BS 202 can activate or deactivate the SCell based on L1 or L3 measurement results from the UE. Furthermore, the DU of BS 202 should be aware of the association between the SCell index and cell ID. In some embodiments, List #A should be provided by the CU of BS 202 to the DU of BS 202. In some embodiments, the CU of BS 202 may provide all SCells to the DU of BS 202. In some embodiments, the CU of BS 202 may select a part of the SCell list and provide the selected SCells to the DU of BS 202. In some embodiments, the request message may include an indicator indicating whether the SCell (s) is activated or deactivated. In some embodiments, the SCell (s) may be activated or deactivated by default. In some embodiments, the request message may include an early sync candidate cell information list, which indicates the cell ID (s) and early UL sync configuration. The specific definition of the early sync candidate cell information list can be referred to in 3GPP specifications. In some embodiments, the request message may include a semi-persistent CSI-RS (SP-CSI-RS) resource configuration. In some embodiments, the DU of BS 202 can transmit a MAC CE to a UE (e.g., UE 204) to activate or deactivate a CSI-RS resource set based on the measurement report from the UE.
[0058] At 215, BS 202 may transmit configuration information to UE 204. The configuration information may include at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell. In some embodiments, the LTM candidate configuration may be associated with a candidate cell (e.g., an SpCell such as a PCell for MCG LTM or a PSCell for SCG LTM) and (optionally) one or more SCells associated with the candidate cell.
[0059] In some embodiments, the L1 and / or L3 measurement configuration may include a resource configuration indicating at least one RS (e.g., SSB or CSI-RS) resource set for the one or more SCells, thereby enabling SCell activation or deactivation based on the measurement results. For example, the resource configuration may include an SCell index of each of the one or more SCells as well as the corresponding RS resource set (s) . For example, the SSB / CSI-RS configuration per LTM candidate PCell / PSCell may include an associated SCell index and may be configured for UE 204. UE 204 can perform SCell measurement on the SCells based on the resource configurations.
[0060] In some embodiments, for subsequent LTM, the association between the RS configuration and the SCell index may be transmitted from the CU of BS 202 to the candidate DUs. In some embodiments, for subsequent LTM, the information in List #A may be transmitted from the CU of BS 202 to the candidate DUs. As mentioned above, the CU of BS 202 may also transmit the association or information to the DU of BS 202.
[0061] Based on the configuration information from BS 202, UE 204 can perform measurements and may report L1 measurement results, L3 measurement results or both to BS 202 at 217. For example, BS 202 (e.g., the CU of BS 202) may receive the L3 measurement report from UE 204. In response to receiving the measurement report, BS 202 (e.g., the CU of BS 202) may, at 219, determine to trigger at least one of the following operations: activation or deactivation of at least one SCell associated with the at least one candidate cell, an early UL sync with the at least one SCell, or an early DL sync with the at least one SCell. In some embodiments, BS 202 (e.g., the CU of BS 202) may determine to trigger at least one of the following operations: an early UL synchronization with a candidate cell of the at least one candidate cell, an early DL synchronization the candidate cell, or a cell switch to the candidate cell. In some embodiments, BS 202 may determine to trigger any combination of the above mentioned operations.
[0062] For example, the CU of BS 202 may transmit a message (e.g., a CU-DU mobility initiation request message) to the DU (e.g., the DU serving UE 204) of BS 202 to indicate the triggering of the above operation (s) . In response to receiving the message from the CU, the DU of BS 202 may, at 231, transmit a message to UE 204 to trigger UE 204 to perform the corresponding operation (s) .
[0063] For example, the CU-DU mobility initiation request message may indicate the triggering of an early UL sync of at least one SCell, and BS 202 (e.g., the DU of BS 202) may instruct UE 204 to trigger the early UL sync with the at least one SCell accordingly. For example, BS 202 (e.g., the DU of BS 202) may transmit a physical downlink control channel (PDCCH) order to UE 204 to trigger the UE to perform an early UL sync procedure towards the at least one SCell. In response to receiving the PDCCH order for early UL sync, UE 204 may transmit a preamble to the at least one SCell. In some embodiments, the CU-DU mobility initiation request message may indicate assistance information associated with the at least one SCell, such as beam information or transmission configuration indication (TCI) state information associated with the at least one SCell. In some embodiments, the beam information may include an SSB index, a TCI state ID or both.
[0064] For example, the CU-DU mobility initiation request message may indicate the triggering of an early DL sync of at least one SCell, and BS 202 (e.g., the DU of BS 202) may instruct UE 204 to trigger the DL sync with the at least one SCell accordingly. In some embodiments, the CU-DU mobility initiation request message may indicate assistance information associated with the at least one SCell such as beam information or TCI state information associated with the at least one SCell.
[0065] For example, the CU-DU mobility initiation request message may indicate to switch UE 204 to a candidate cell of the at least one candidate cell (e.g., configured by the LTM candidate configuration) and indicate the triggering of the activation or deactivation of at least one SCell associated with this candidate cell. For example, the CU-DU mobility initiation request message may indicate at least one of the index (es) of the SCell (s) to be activated or the index (es) of the SCell (s) to be deactivated. BS 202 (e.g., the DU of BS 202) may instruct UE 204 to switch to the candidate cell and activate or deactivate the at least one SCell. In some embodiments, the CU-DU mobility initiation request message may indicate assistance information associated with the at least one SCell such as beam information or TCI state information associated with the at least one SCell.
[0066] For example, at 231, BS 202 may transmit a cell switch command (e.g., LTM cell switch command MAC CE) to UE 204 for cell switching as well as SCell activation or deactivation. For example, the cell switch command may instruct UE 204 to switch to an SpCell (e.g., a PCell for MCG LTM or a PSCell for SCG LTM) by indicating a corresponding LTM candidate configuration (e.g., the MAC CE includes a target configuration ID identifying the LTM candidate configuration configured for and stored at UE 204) . The cell switch command may also indicate the SCell index of each of the at least one SCell to be activated or deactivated. At 233, UE 204 may perform a cell switch towards the target candidate cell (e.g., the target SpCell) and may activate or deactivate the at least one SCell. UE 204 may then access the target candidate cell (e.g., the target SpCell) with an activated SCell (s) .
[0067] It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary procedure 200 may be changed and that some of the operations in exemplary procedure 200 may be eliminated or modified, without departing from the spirit and scope of the disclosure.
[0068] FIG. 3 illustrates exemplary procedure 300 related to SCell activation in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 3.
[0069] Referring to FIG. 3, UE 304 may connect to (or access) BS 302A. For example, UE 304 may access a cell of BS 302A, whereby this cell can be referred to as the "serving cell" of UE 304 and BS 302A can be referred to as the "serving BS" of UE 304. In some embodiments, UE 304 may access the network via single connectivity and BS 302A is associated with the MCG of UE 304. For example, UE 304 may access the network via MCG only in a stand-alone mode. In some embodiments, UE 304 may access the network via multi-connectivity (e.g., via DC) . For example, in addition to BS 302A, UE 304 may connect to another BS (denoted as BS #C) . In some examples, BS 302A and BS #C may be respectively associated with the MCG and SCG of UE 304, and thus may be respectively referred to as an MN and an SN of UE 304. In some examples, BS 302A and BS #C may be respectively associated with the SCG and MCG of UE 304, and thus may be respectively referred to as an SN and an MN of UE 304. In some embodiments, BS 302A may include a CU and at least one DU.
[0070] At 311, UE 304 may transmit UE capability information (e.g., a capability related message) to BS 302A. In some examples, the UE capability information is transmitted in response to a request from BS 302A. In some examples, the request for UE capability information may be transmitted from the MN and the UE capability information may be transmitted to the MN. In some examples, the request for UE capability information may be transmitted from the SN and the UE capability information may be transmitted to the SN. The descriptions of the UE capability information mentioned with respect to FIG. 2 can apply here, and are thus omitted here. For example, the UE capability information may include one or more of the first information to fifth information as mentioned with respect to FIG. 2.
[0071] In some embodiments, BS 302A (e.g., the CU of BS 302A) may determine to prepare an LTM candidate cell for UE 304. BS 302A, the CU of BS 302A and the DU of BS 302A may also be referred to as the source BS, the source CU and the source DU, respectively. In the case of inter-BS (e.g., inter-CU) LTM, BS 302A (e.g., the CU of BS 302A) may transmit a request message (e.g., a handover request) for an LTM candidate cell to a candidate BS (e.g., BS 302B) . BS 302B may include a CU and at least one DU. For example, BS 302A and BS 302B may perform an LTM candidate preparation procedure at 313. During the LTM candidate preparation procedure, BS 302A (e.g., the CU of BS 302A) may transmit a request message for an LTM candidate cell to BS 302B (e.g., the CU of BS 302B) . In the case of intra-BS (e.g., intra-CU) LTM, the signaling between BS 302A and BS 302B (e.g., the handover request as well as the corresponding response which will be described below) can be omitted. For example, the CU of BS 302A can transmit the request for an LTM candidate cell to the candidate DU directly via the F1 interface or F1-like interface. The candidate DU may then perform similar operations as the DU of BS 302B as described below. The candidate DU can transmit the response to the CU of BS 302A directly via the F1 interface or F1-like interface.
[0072] In some embodiments, the request may include information related to subsequent LTM. This means that the prepared LTM candidate should support subsequent LTM. In some examples, the UE capability information of UE 304 may be transmitted to BS 302B. For example, UE capability related to SCell activation may be transmitted to BS 302B.
[0073] Either the MN or the SN can determine to prepare an LTM candidate cell for UE 304. For example, in the case of MCG LTM, the MN may transmit the request to a candidate MN. In the case of SCG LTM, the MN may transmit the request to a candidate SN after the SN requests the MN to prepare a candidate cell (e.g., a candidate SCG or a candidate PSCell) .
[0074] In response to receiving the request message from BS 302A, the CU of BS 302B may transmit a request message (e.g., a UE context setup request message) to a candidate DU (denoted as DU #B2) of BS 302B. In some embodiments, the request message may include a list of SCells to be set up. If DU #B2 succeeds in establishing the UE context, it may reply to the CU of BS 302B with a response message (e.g., a UE context setup response message) . In the case of intra-BS (e.g., intra-CU) , the CU of BS 302A may transmit the request message to a candidate DU, which belongs to BS 302A and transmits the response message to the CU of BS 302A.
[0075] In some embodiments, if DU #B2 determines to accept the request for LTM configuration related to a candidate cell (i.e., a candidate SpCell such as a candidate PCell or PSCell) , DU #B2 may respond to the CU of BS 302B with a response message including RRC configuration for the accepted target candidate cell. In some embodiments, DU #B2 may respond a list of SCells that failed to set up in the response message.
[0076] In response to receiving the response message from DU #B2, the CU of BS 302B may transmit a response message to BS 302A (e.g., the CU of BS 302A) in response to the request message for an LTM candidate cell from BS 302A. In some embodiments, the CU of BS 302B may transmit an LTM candidate configuration to BS 302A (e.g., the CU of BS 302A) . For example, the response message to BS 302A (e.g., the CU of BS 302A) may include a container for the LTM candidate configuration. The descriptions of the LTM candidate configuration mentioned with respect to FIG. 2 can apply here, and are thus omitted here.
[0077] In some embodiments, the response message to BS 302A (e.g., the CU of BS 302A) may include a list of the one or more SCells associated with the LTM candidate configuration. For convenience, this list is hereinafter referred to as List #B. The descriptions of List #A mentioned with respect to FIG. 2 can apply to List #B. For example, List #B may be generated by the CU of BS 302B and provided independent of the container for the LTM candidate configuration. List #B may include one or more of information (1) to information (3) as mentioned with respect to FIG. 2.
[0078] In response to receiving the response message from the candidate BS (e.g., its CU) , the CU of BS 302A may transmit a request for a modification purpose (e.g., a UE context modification request message) to the DU of BS 302A at 315. In some embodiments, the DU of BS 302A should be aware of the SCell configuration. The DU of BS 302A can activate or deactivate the SCell based on L1 or L3 measurement results from the UE. Furthermore, the DU of BS 302A should be aware of the association between the SCell index and cell ID. In some embodiments, List #B should be provided by the CU of BS 302A to the DU of BS 302A. In some embodiments, the CU of BS 302A may provide all SCells to the DU of BS 302A. In some embodiments, the CU of BS 302A may select a part of the SCell list and provide the selected SCells to the DU of BS 302A. In some embodiments, the request message at 315 may include an indicator indicating whether the SCell (s) is activated or deactivated. In some embodiments, the SCell (s) may be activated or deactivated by default. In some embodiments, the request message at 315 may include an early sync candidate cell information list, which indicates the cell ID (s) and early UL sync configuration. In some embodiments, the request message at 315 may include an SP-CSI-RS resource configuration. In some embodiments, the DU of BS 302A can transmit a MAC CE to a UE (e.g., UE 304) to activate or deactivate a CSI-RS resource set based on the measurement report from the UE.
[0079] At 317, BS 302A may transmit configuration information to UE 304. The configuration information may include at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell. In some embodiments, the LTM candidate configuration may be associated with a candidate cell (e.g., an SpCell such as a PCell for MCG LTM or a PSCell for SCG LTM) and (optionally) one or more SCells associated with the candidate cell.
[0080] The descriptions of the measurement configuration and the LTM candidate configuration mentioned with respect to FIG. 2 can apply here. For example, an RS (e.g., SSB or CSI-RS) from the one or more SCells may be configured for the purpose of SCell measurement, so that the SCells can be activated or deactivated based on the measurement results. For example, the L1 and / or L3 measurement configuration may include a resource configuration indicating at least one RS (e.g., SSB or CSI-RS) resource set for the one or more SCells. For example, the resource configuration may include an SCell index of each of the one or more SCells as well as the corresponding RS resource set (s) . For example, the SSB / CSI-RS configuration per LTM candidate PCell / PSCell may include an associated SCell index and may be configured for UE 204. UE 204 can perform SCell measurement on the SCells based on the resource configurations.
[0081] In some embodiments, for subsequent LTM, the association between the RS configuration and the SCell index may be transmitted from the CU of BS 302A to the candidate DUs. In some embodiments, for subsequent LTM, the information in List #B may be transmitted from the CU of BS 302A to the candidate DUs. As mentioned above, the CU of BS 302A may also transmit the association or information to the DU of BS 302A.
[0082] Based on the configurations from BS 302A, UE 304 can perform measurements and may report L1 measurement results, L3 measurement results or both to BS 302A at 319. For example, BS 302A (e.g., the CU of BS 302A) may receive the L3 measurement report from UE 304. For example, BS 302A (e.g., the DU of BS 302A) may receive the L1 measurement report from UE 304.
[0083] In response to receiving the measurement report from UE 304, BS 302A may, at 331, select at least one SCell for activation or deactivation based on the measurement results from UE 304. At 333, BS 302A (e.g., the DU of BS 302A) may transmit a MAC CE to UE 304 to activate or deactivate the at least one SCell. In some embodiments, the at least one SCell may be associated with an LTM candidate configuration (s) . In some embodiments, the MAC CE may indicate the SCell index of each of the at least one SCell.
[0084] For example, BS 302A may transmit a cell switch command (e.g., LTM cell switch command MAC CE) to UE 304 for cell switching as well as SCell activation or deactivation. For example, the cell switch command may instruct UE 304 to switch to a target cell (e.g., a PCell for MCG LTM or a PSCell for SCG LTM) by indicating a corresponding LTM candidate configuration. For example, the cell switch command includes a target configuration ID identifying the LTM candidate configuration configured for and stored at UE 304. The cell switch command may also indicate UE 304 to activate or deactivate at least one SCell associated with the LTM candidate configuration (or other LTM candidate configuration (s) ) . The cell switch command may indicate the SCell index of each of the at least one SCell to be activated or deactivated. For example, the LTM candidate configuration may include configuration information for one or more SCells associated with a candidate SpCell and the at least one SCell to be activated or deactivated may be from the one or more SCells.
[0085] In response to receiving the cell switch command, UE 304 may perform a cell switch towards the target cell and may activate or deactivated the at least one SCell at 335. UE 304 may then access the target cell with an activated SCell (s) .
[0086] For the sake of clarity, it is assumed that the cell switch command indicates UE 304 to switch to cell #T and indicate the activation of SCell #S associated with cell #T. In some embodiments, in response to receiving the cell switch command, UE 304 may start a timer for the LTM cell switch (e.g., timer T304 as specified in 3GPP specifications) . UE 304 may stop the timer in response to a completion of the LTM cell switch (e.g., UE 304 is switched to cell #T) .
[0087] In some embodiments, an SCell deactivation timer may be configured for SCell #S. For example, UE 304 may be configured with an SCell deactivation timer per configured SCell (except the SCell configured with physical uplink control channel (PUCCH) , if any) . In response to the expiry of the timer, UE 304 may deactivate the associated SCell. In various cases, UE 304 may start or restart the timer. For example, UE 304 may restart the deactivation timer associated with a specific SCell if a MAC PDU is received by UE 304 in a configured DL assignment for the SCell.
[0088] In some embodiments, UE 304 may start the SCell deactivation timer for SCell #S in response to receiving the cell switch command (i.e., in response to receiving the activation indication of SCell #S) . In some embodiments, UE 304 may start the SCell deactivation timer for SCell #S in response to the start of the timer for the LTM cell switch.
[0089] In some embodiments, it would be beneficial to start the SCell deactivation timer later, to, for example, avoid deactivating an activated SCell due to timer expiry before the SCell is actually used.
[0090] For example, UE 304 may start the SCell deactivation timer for SCell #S in response to the completion of the LTM cell switch. In some embodiments, UE 304 may start the SCell deactivation timer for SCell #S in response to the stop of the timer for the LTM cell switch.
[0091] In some embodiments, in response to receiving the cell switch command, UE 304 may perform a random access channel (RACH) -less cell switch to cell #T. For example, UE 304 may be configured with a configured grant (CG) resource of cell #T (i.e., target cell) or SCell #S (i.e., activated SCell) , which may be used during the cell switch. For example, UE 304 may perform a RACH-less cell switch using the CG resource, including for example, transmitting a first transmission on the CG resource. In some embodiments, in response to transmitting the first transmission, UE 304 may start the SCell deactivation timer for SCell #S. In some embodiments, in response to transmitting the first transmission using the CG resource of SCell #S, UE 304 may start the SCell deactivation timer for SCell #S.
[0092] In some embodiments, in response to receiving the cell switch command, UE 304 may perform a RACH-less cell switch without a CG resource. That is, UE 304 is not configured with a CG resource of cell #T or SCell #S. UE 304 may monitor a PDCCH (i.e., downlink control information (DCI) ) in cell #T and / or SCell #S. In some embodiments, in response to receiving a PDCCH allocating a UL grant from cell #T or SCell #S, UE 304 may start the SCell deactivation timer for SCell #S. In some embodiments, in response to receiving a PDCCH allocating a UL grant from SCell #S, UE 304 may start the SCell deactivation timer for SCell #S.
[0093] In some embodiments, a bandwidth part (BWP) inactivity timer associated with an active downlink BWP of SCell #S may be configured for UE 304. In response to the expiry of the timer, UE 304 may fall back to the default BWP of SCell #S. In some embodiments, when the network releases the timer configuration, UE 304 may stop the timer without switching to the default BWP of SCell #S. In various cases, UE 304 may start or restart the timer. For example, UE 304 may start or restart the BWP inactivity timer for SCell #S if, for example, a MAC PDU is received on SCell #S in a configured downlink assignment for unicast or multicast / broadcast service (MBS) multicast and if no RACH procedure is ongoing.
[0094] In some embodiments, UE 304 may start or restart the BWP inactivity timer for SCell #S in response to receiving the cell switch command (i.e., in response to receiving the activation indication of SCell #S) . In some embodiments, UE 304 may start the BWP inactivity timer for SCell #S in response to the start of the timer for the LTM cell switch.
[0095] In some embodiments, similar to the SCell deactivation timer, it would be beneficial to start or restart the BWP inactivity timer later. For example, UE 304 may start or restart the BWP inactivity timer for SCell #S in response to the completion of the LTM cell switch. In some embodiments, UE 304 may start or restart the BWP inactivity timer for SCell #S in response to the completion of the LTM cell switch and SCell #S being activated. In some embodiments, UE 304 may start or restart the BWP inactivity timer for SCell #S in response to the stop of the timer for the LTM cell switch. In some embodiments, UE 304 may start or restart the BWP inactivity timer for SCell #S in response to the stop of the timer for the LTM cell switch and SCell #S being activated.
[0096] In some embodiments, in response to receiving the cell switch command, UE 304 may perform a RACH-less cell switch to cell #T. For example, UE 304 may be configured with a CG resource of cell #T (i.e., target cell) or SCell #S (i.e., activated SCell) , which may be used during the cell switch. For example, UE 304 may perform a RACH-less cell switch using the CG resource, including for example, transmitting a first transmission on the CG resource. In some embodiments, in response to transmitting the first transmission, UE 304 may start or restart the BWP inactivity timer for SCell #S. In some embodiments, in response to transmitting the first transmission using the CG resource of SCell #S, UE 304 may start or restart the BWP inactivity timer for SCell #S.
[0097] In some embodiments, in response to receiving the cell switch command, UE 304 may perform a RACH-less cell switch without a CG resource. UE 304 may monitor a PDCCH (i.e., a DCI) in cell #T and / or SCell #S. In some embodiments, in response to receiving a PDCCH allocating a UL grant from cell #T or SCell #S, UE 304 may start or restart the BWP inactivity timer for SCell #S. In some embodiments, in response to receiving a PDCCH allocating a UL grant from SCell #S, UE 304 may start or restart the BWP inactivity timer for SCell #S.
[0098] It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary procedure 300 may be changed and that some of the operations in exemplary procedure 300 may be eliminated or modified, without departing from the spirit and scope of the disclosure.
[0099] FIG. 4 illustrates exemplary procedure 400 related to dynamic measurement configuration change in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 4.
[0100] Referring to FIG. 4, UE 404 may connect to (or access) BS 402A. For example, UE 404 may access a cell of BS 402A, whereby this cell can be referred to as the "serving cell" of UE 404 and BS 402A can be referred to as the "serving BS" of UE 404. In some embodiments, UE 404 may access the network via single connectivity and BS 402A is associated with the MCG of UE 404. For example, UE 404 may access the network via MCG only in a stand-alone mode. In some embodiments, UE 404 may access the network via multi-connectivity (e.g., via DC) . For example, in addition to BS 402A, UE 404 may connect to another BS (denoted as BS #C) . In some examples, BS 402A and BS #C may be respectively associated with the MCG and SCG of UE 404, and thus may be respectively referred to as an MN and an SN of UE 404. In some examples, BS 402A and BS #C may be respectively associated with the SCG and MCG of UE 404, and thus may be respectively referred to as an SN and an MN of UE 404. In some embodiments, BS 402A may include a CU and at least one DU.
[0101] At 411, UE 404 may transmit UE capability information (e.g., a capability related message) to BS 402A. In some examples, the UE capability information is transmitted in response to a request from BS 402A. In some examples, the request for UE capability information may be transmitted from the MN and the UE capability information may be transmitted to the MN. In some examples, the request for UE capability information may be transmitted from the SN and the UE capability information may be transmitted to the SN. The descriptions of the UE capability information mentioned with respect to FIG. 2 can apply here, and are thus omitted here. For example, the UE capability information may include one or more of the first information to fifth information as mentioned with respect to FIG. 2.
[0102] In some embodiments, BS 402A (e.g., the CU of BS 402A) may determine to prepare an LTM candidate cell for UE 404. BS 402A, the CU of BS 402A, and the DU of BS 402A may also be referred to as the source BS, the source CU and the source DU, respectively. In the case of inter-BS (e.g., inter-CU) LTM, BS 402A (e.g., the CU of BS 402A) may transmit a request message (e.g., a handover request) for an LTM candidate cell to a candidate BS (e.g., BS 402B) . BS 402B may include a CU and at least one DU. For example, BS 402A and BS 402B may perform an LTM candidate preparation procedure at 413. During the LTM candidate preparation procedure, BS 402A (e.g., the CU of BS 402A) may transmit a request message for an LTM candidate cell to BS 402B (e.g., the CU of BS 402B) . In the case of intra-BS (e.g., intra-CU) LTM, the signaling between BS 402A and BS 402B (e.g., the handover request as well as the corresponding response which will be described below) can be omitted. For example, the CU of BS 402A can transmit the request for an LTM candidate cell to the candidate DU directly via the F1 interface or F1-like interface. The candidate DU may then perform similar operations as the DU of BS 402B as described below. The candidate DU can transmit the response to the CU of BS 402A directly via the F1 interface or F1-like interface.
[0103] In some embodiments, the request may include information related to subsequent LTM. This means that the prepared LTM candidate should support subsequent LTM. In some examples, the UE capability information of UE 404 may be transmitted to BS 402B. For example, UE capability related to SCell activation may be transmitted to BS 402B.
[0104] Either the MN or the SN can determine to prepare an LTM candidate cell for UE 404. For example, in the case of MCG LTM, the MN may transmit the request to a candidate MN. In the case of SCG LTM, the MN may transmit the request to a candidate SN after the SN requests the MN to prepare a candidate cell (e.g., a candidate SCG or a candidate PSCell) .
[0105] In response to receiving the request message from BS 402A, the CU of BS 402B may transmit a request message (e.g., a UE context setup request message) to a candidate DU (denoted as DU #B3) of BS 402B. In some embodiments, the request message may include a list of SCells to be set up. If DU #B3 succeeds in establishing the UE context, it may reply to the CU of BS 402B with a response message (e.g., a UE context setup response message) . In the case of intra-BS (e.g., intra-CU) , the CU of BS 402A may transmit the request message to a candidate DU, which belongs to BS 402A and transmits the response message to the CU of BS 402A.
[0106] In some embodiments, if DU #B3 determines to accept the request for LTM configuration related to a candidate cell (i.e., a candidate SpCell such as a candidate PCell or PSCell) , DU #B3 may respond to the CU of BS 402B with a response message including RRC configuration for the accepted target candidate cell. In some embodiments, DU #B3 may respond a list of SCells that failed to set up in the response message.
[0107] In response to receiving the response message from DU #B3, the CU of BS 402B may transmit a response message to BS 402A (e.g., the CU of BS 402A) in response to the request message for an LTM candidate cell from BS 402A. In some embodiments, the CU of BS 402B may transmit an LTM candidate configuration to BS 402A (e.g., the CU of BS 402A) . For example, the response message to BS 402A (e.g., the CU of BS 402A) may include a container for the LTM candidate configuration. The descriptions of the LTM candidate configuration mentioned with respect to FIG. 2 can apply here, and are thus omitted here.
[0108] In some embodiments, the response message to BS 402A (e.g., the CU of BS 402A) may include a list of the one or more SCells associated with the LTM candidate configuration. For convenience, this list is hereinafter referred to as List #C. The descriptions of List #A mentioned with respect to FIG. 2 can apply to List #C. For example, List #C may be generated by the CU of BS 402B and provided independent of the container for the LTM candidate configuration. List #C may include one or more of information (1) to information (3) as mentioned with respect to FIG. 2.
[0109] In response to receiving the response message from the candidate BS (e.g., its CU) , the CU of BS 402A may transmit a request for a modification purpose (e.g., a UE context modification request message) to the DU of BS 402A at 415. In some embodiments, the DU of BS 402A should be aware of the SCell configuration. The DU of BS 402A can activate or deactivate the SCell based on L1 or L3 measurement results from the UE. Furthermore, the DU of BS 402A should be aware of the association between the SCell index and cell ID. In some embodiments, List #C should be provided by the CU of BS 402A to the DU of BS 402A. In some embodiments, the CU of BS 402A may provide all SCells to the DU of BS 402A. In some embodiments, the CU of BS 402A may select a part of the SCell list and provide the selected SCells to the DU of BS 402A. In some embodiments, the request message at 415 may include an indicator indicating whether the SCell (s) is activated or deactivated. In some embodiments, the SCell (s) may be activated or deactivated by default. In some embodiments, the request message at 415 may include an early sync candidate cell information list, which indicates the cell ID (s) and early UL sync configuration. In some embodiments, the request message at 415 may include an SP-CSI-RS resource configuration. In some embodiments, the DU of BS 402A can transmit a MAC CE to a UE (e.g., UE 404) to activate or deactivate a CSI-RS resource set based on the measurement report from the UE.
[0110] At 417, BS 402A may transmit configuration information to UE 404. The configuration information may include at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell. In some embodiments, the LTM candidate configuration may be associated with a candidate cell (e.g., an SpCell such as a PCell for MCG LTM or a PSCell for SCG LTM) and (optionally) one or more SCells associated with the candidate cell. The descriptions of the measurement configuration and the LTM candidate configuration mentioned with respect to FIG. 2 can apply here.
[0111] In some embodiments, the L1 measurement configuration may include at least one of a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration. In some embodiments, each report configuration may include a report configuration ID for identifying the corresponding report configuration, and may be associated with an L1 event. For example, when the L1 event is satisfied, UE 404 may report the measurement results based on the report configuration. Each resource configuration may include a resource configuration ID for identifying the corresponding resource configuration. Each resource configuration may indicate RS (e.g., SSB or CSI-RS) resource sets for LTM candidate cells. For example, the resource configuration may include a list of RS resources and the corresponding candidate ID for each RS resource. Each candidate ID (e.g., LTM candidate ID) can identify an LTM candidate configuration for an LTM candidate cell. The resource configuration may be associated with the report configuration. For example, the report configuration may point to a specific resource configuration (s) that UE 404 uses to perform measurements and report the measurement results. For example, the report configuration may include the report configuration ID (s) .
[0112] The report configuration, the resource configuration or LTM candidate configuration can be activated or deactivated by default or based on an activation or deactivation indication. Persons skilled in the art can understand that activating or deactivating a configuration ID means activating or deactivating the configuration (e.g., the report configuration, the resource configuration or the LTM candidate configuration) identified by the configuration ID. Similarly, activating or deactivating a list of candidate IDs means activating or deactivating each LTM candidate configuration identified by the list of candidate IDs.
[0113] In some embodiments, the report configuration may indicate one or more lists of candidate IDs. For each listed candidate ID, the network (e.g., BS 402A) may configure an offset, which can be applied to all the RSs belonging to the corresponding candidate ID associated with the report configuration. In an example, the offset value may be 0dB. In some embodiments, if a candidate ID is not provided in the one or more lists of candidate IDs in the report configuration, it means that UE 404 is not required to measure or evaluate the RSs that belong to this candidate ID for the event associated with the report configuration, even if the RSs are configured within the resource configuration to which the report configuration points to.
[0114] In some embodiments, the network (e.g., BS 402A) may activate or deactivate a report configuration ID for dynamic L1 measurement and reporting configuration change. In some embodiments, the network (e.g., BS 402A) may activate or deactivate at least one list of candidate IDs among the one or more lists of candidate IDs in a report configuration for dynamic L1 measurement and reporting configuration change. For example, BS 402A may transmit, to UE 404, an indication for activating or deactivating at least one list of candidate IDs among the one or more lists of candidate IDs. For example, BS 402A may transmit, to UE 404, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration.
[0115] Based on the configurations as well as the activation or deactivation indication of the configurations from BS 402A, UE 404 can perform measurements and event evaluation.
[0116] In some embodiments, in response to receiving the configuration information (e.g., the L1 measurement configuration which includes a report configuration, a resource configuration and one or more lists of candidate IDs associated with the report configuration) , UE 404 may perform at least one of an L1 measurement based on the L1 measurement configuration or evaluating the L1 event associated with the report configuration, regardless of whether the report configuration, the resource configuration or the lists of candidate IDs are activated or not. For example, in response to receiving an RRC message including an L1 measurement configuration, UE 404 may start at least one of measurement or event evaluation based on the L1 measurement configuration even if the L1 measurement configuration (e.g., the report configuration ID, resource configuration ID, or the list of candidate ID associated with the report configuration) is not activated.
[0117] In some embodiments, in response to receiving the configuration information (e.g., the L1 measurement configuration which includes a report configuration, a resource configuration and one or more lists of candidate IDs associated with the report configuration) , UE 404 may perform at least one of an L1 measurement based on the L1 measurement configuration or evaluating the L1 event associated with the report configuration when the resource configuration is activated, regardless of whether the report configuration or the lists of candidate IDs are activated or not. For example, in response to receiving an RRC message including an L1 measurement configuration, if the resource configuration ID in the L1 measurement configuration is activated, UE 404 may start at least one of measurement or event evaluation based on the L1 measurement configuration even if the report configuration ID or the list of candidate ID associated with the report configuration is not activated.
[0118] In some embodiments, in response to receiving the configuration information (e.g., the L1 measurement configuration which includes a report configuration, a resource configuration and one or more lists of candidate IDs associated with the report configuration) , UE 404 may start at least one of performing an L1 measurement based on the L1 measurement configuration or evaluating the L1 event associated with the report configuration only when the resource configuration, the report configuration and at least one list of candidate IDs are activated. For example, in response to receiving an RRC message including an L1 measurement configuration, UE 404 does not start a measurement or event evaluation if no resource configuration ID, no RS resource ID or no list of candidate IDs is activated. UE 404 may start at least one of measurement or event evaluation based on the L1 measurement configuration in response to the resource configuration, the report configuration ID and at least one list of candidate IDs associated with the report configuration being activated.
[0119] In some embodiments, a report configuration may be associated with an SP-CSI-RS resource. In some embodiments, the network needs to ensure that the SP-CSI-RS resource is activated before or when the network activates the report configuration. For example, when BS 402A transmits an indication (e.g., via a MAC CE) to activate the report configuration, the associated SP-CSI-RS resource should be activated at the same time or beforehand. In some embodiments, if UE 404 receives an indication (e.g., via a MAC CE) to activate the report configuration while the associated SP-CSI-RS resource is in a deactivated state, UE 404 may discard the indication. For example, UE 404 may discard the MAC CE including the indication, the MAC sub-PDU including the MAC CE or the MAC PDU including the MAC CE.
[0120] At 419, UE 404 may report L1 measurement results, L3 measurement results or both to BS 402A. For example, BS 402A (e.g., the CU of BS 402A) may receive the L3 measurement report from UE 404. For example, BS 402A (e.g., the DU of BS 402A) may receive the L1 measurement report from UE 404. In response to receiving the measurement report from UE 404, BS 402A may transmit a MAC CE to UE 404 to activate or deactivate the at least one SCell. In some embodiments, the at least one SCell may be associated with an LTM candidate configuration (s) . In some embodiments, the MAC CE may indicate the SCell index of each of the at least one SCell.
[0121] For example, at 433, BS 402A may transmit a cell switch command (e.g., LTM cell switch command MAC CE) to UE 404 for cell switching as well as SCell activation or deactivation. In response to receiving the cell switch command, UE 404 may perform a cell switch towards the target cell and may activate or deactivated the indicated SCell at 435. UE 404 may then access the target cell with an activated SCell (s) .
[0122] It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary procedure 400 may be changed and that some of the operations in exemplary procedure 400 may be eliminated or modified, without departing from the spirit and scope of the disclosure.
[0123] FIG. 5 illustrates a flowchart of method 500 for wireless communication in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 5. In some examples, method 500 may be performed by a UE. In some embodiments, the UE may execute a set of instructions to control the functional elements of the UE to perform the described functions or operations. In some examples, a processor of the UE may cause the UE to perform method 500.
[0124] At 511, a UE may receive, from a BS, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell.
[0125] At 513, the UE may receive, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration.
[0126] At 515, the UE may transmit, to the BS, a measurement report based on the configuration information and the indication.
[0127] In some embodiments, the UE may receive, from the BS, a cell switch command for switching the UE to a first candidate cell of the at least one candidate cell, and the cell switch command indicates activation of an SCell associated with the first candidate cell.
[0128] In some embodiments, the UE may, in response to receiving the cell switch command or in response to switching the UE to the first candidate cell being completed, perform at least one of: starting a deactivation timer for the SCell; or starting or restarting a BWP inactivity timer associated with an active downlink BWP of the SCell.
[0129] In some embodiments, the UE may, in response to switching the UE to the first candidate cell being completed and the SCell being activated, start or restart the BWP inactivity timer associated with an active downlink BWP of the SCell.
[0130] In some embodiments, the UE may perform a RACH-less cell switch to the first candidate cell, which may include transmitting a first transmission on a CG resource of the first candidate cell or the SCell. In some embodiments, the UE may, in response to transmitting the first transmission, perform at least one of starting a deactivation timer for the SCell, or starting or restarting a BWP inactivity timer associated with an active downlink BWP of the SCell.
[0131] In some embodiments, the UE may: perform a RACH-less cell switch to the first candidate cell, including receiving a UL grant from the first candidate cell or the SCell; and in response to receiving the UL grant, perform at least one of starting a deactivation timer for the SCell, or starting or restarting a BWP inactivity timer associated with an active downlink BWP of the SCell.
[0132] In some embodiments, the report configuration indicates a plurality of lists of candidate IDs, and the indication activates or deactivates at least one list of candidate IDs among the plurality of lists of candidate IDs.
[0133] In some embodiments, the UE may, in response to receiving the configuration information, perform at least one of an L1 measurement based on the L1 measurement configuration or evaluating an L1 event associated with the report configuration, regardless of whether the report configuration, the resource configuration or the list of candidate IDs is activated or not. In some embodiments, the UE may, in response to receiving the configuration information, perform at least one of the L1 measurement based on the L1 measurement configuration or evaluating the L1 event when the resource configuration is activated, regardless of whether the report configuration or the list of candidate IDs is activated or not.
[0134] In some embodiments, the UE may start at least one of performing an L1 measurement based on the L1 measurement configuration or evaluating an L1 event associated with the report configuration until the report configuration, the resource configuration and the list of candidate IDs are activated.
[0135] In some embodiments, the report configuration is associated with an SP-CSI-RS resource. The indication activates the report configuration. The UE may discard the indication in response to the SP-CSI-RS resource being in a deactivated state. For example, the UE may receive a MAC CE which activates the report configuration while the SP-CSI-RS resource is deactivated. The UE may discard the MAC CE, discard the MAC sub-PDU including the MAC CE, or discard the MAC PDU including the MAC CE.
[0136] It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary method 500 may be changed and some of the operations in exemplary method 500 may be eliminated or modified, without departing from the spirit and scope of the disclosure.
[0137] FIG. 6 illustrates a flowchart of method 600 for wireless communication in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 6. In some examples, method 600 may be performed by a network node such as a BS or a RAN node. In some embodiments, the BS may execute a set of instructions to control the functional elements of the BS to perform the described functions or operations. In some examples, a processor of the BS may cause the BS to perform method 600.
[0138] At 611, a BS may transmit, to a UE, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell.
[0139] At 613, the BS may transmit, to the UE, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration.
[0140] At 615, the BS may receive, from the UE, a measurement report based on the configuration information and the indication.
[0141] In some embodiments, the measurement report is a L3 measurement report and is received by a CU of the BS. The BS may transmit, from the CU to a DU of the BS, a first message indicating triggering of at least one operation of following operations based on the L3 measurement report: activation or deactivation of at least one SCell associated with the at least one candidate cell, an early UL sync with the at least one SCell, or an early DL sync with the at least one SCell.
[0142] In some embodiments, the first message is a CU-DU mobility initiation request message.
[0143] In some embodiments, the BS may transmit, from the DU to the UE, a second message for triggering the UE to perform the at least one operation.
[0144] In some embodiments, the first message indicates triggering of the early UL sync or the early DL sync, and the first message further indicates beam information or TCI state information associated with the at least one SCell.
[0145] In some embodiments, the first message indicates triggering of the early UL sync. The BS may transmit, from the DU to the UE, a PDCCH order for triggering the UE to perform an early UL sync procedure towards the at least one SCell.
[0146] In some embodiments, the first message indicates to switch the UE to a first candidate cell of the at least one candidate cell and triggering of the activation or deactivation of the at least one SCell associated with the first candidate cell. The first message further indicates beam information or TCI state information associated with the at least one SCell.
[0147] In some embodiments, the report configuration indicates a plurality of lists of candidate IDs, and the indication activates or deactivates at least one list of candidate IDs among the plurality of lists of candidate IDs.
[0148] In some embodiments, the report configuration is associated with an SP-CSI-RS resource, and the indication activates the report configuration. The BS may activate the SP-CSI-RS resource for the UE before or when transmitting the indication. In other words, the BS may ensure that the CSI-RS resource is activated before the corresponding report configuration is activated.
[0149] It should be appreciated by persons skilled in the art that the sequence of the operations in exemplary method 600 may be changed and some of the operations in exemplary method 600 may be eliminated or modified, without departing from the spirit and scope of the disclosure.
[0150] FIG. 7 illustrates an example of UE 700 in accordance with aspects of the present disclosure. The UE 700 may include a processor 702, a memory 704, a controller 706, and a transceiver 708. The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0151] The processor 702, the memory 704, the controller 706, or the transceiver 708, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a digital signal processor (DSP) , an application-specific integrated circuit (ASIC) , or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
[0152] The processor 702 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 702 may be configured to operate the memory 704. In some other implementations, the memory 704 may be integrated into the processor 702. The processor 702 may be configured to execute computer-readable instructions stored in the memory 704 to cause the UE 700 to perform various functions of the present disclosure.
[0153] The memory 704 may include volatile or non-volatile memory. The memory 704 may store computer-readable, computer-executable code including instructions when executed by the processor 702 cause the UE 700 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 704 or another type of memory. 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.
[0154] In some implementations, the processor 702 and the memory 704 coupled with the processor 702 may be configured to cause the UE 700 to perform one or more of the functions described herein (e.g., executing, by the processor 702, instructions stored in the memory 704) . For example, the processor 702 may support wireless communication at the UE 700 in accordance with examples as disclosed herein. For example, the UE 700 may be configured to support means for performing the operations as described with respect to FIGs. 1-6.
[0155] For example, the UE 700 may be configured to or operable to support: a means for receiving, from a BS, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; a means for receiving, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and a means for transmitting, to the BS, a measurement report based on the configuration information and the indication.
[0156] The controller 706 may manage input and output signals for the UE 700. The controller 706 may also manage peripherals not integrated into the UE 700. In some implementations, the controller 706 may utilize an operating system such as or other operating systems. In some implementations, the controller 706 may be implemented as part of the processor 702.
[0157] In some implementations, the UE 700 may include at least one transceiver 708. In some other implementations, the UE 700 may have more than one transceiver 708. The transceiver 708 may represent a wireless transceiver. The transceiver 708 may include one or more receiver chains 710, one or more transmitter chains 712, or a combination thereof.
[0158] A receiver chain 710 may be configured to receive signals (e.g., control information, data, or packets) over a wireless medium. For example, the receiver chain 710 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 710 may include at least one amplifier (e.g., a low-noise amplifier (LNA) ) configured to amplify the received signal. The receiver chain 710 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 receiver chain 710 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0159] A transmitter chain 712 may be configured to generate and transmit signals (e.g., control information, data, or packets) . The transmitter chain 712 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 transmitter chain 712 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 transmitter chain 712 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0160] It should be appreciated by persons skilled in the art that the components in exemplary UE 700 may be changed, for example, some of the components in exemplary UE 700 may be omitted or modified or a new component (s) may be added to exemplary UE 700, without departing from the spirit and scope of the disclosure. For example, in some embodiments, the UE 700 may not include the controller 706.
[0161] FIG. 8 illustrates an example of processor 800 in accordance with aspects of the present disclosure. The processor 800 may be an example of a processor configured to perform various operations in accordance with examples as described herein. The processor 800 may include a controller 802 configured to perform various operations in accordance with examples as described herein. The processor 800 may optionally include at least one memory 804, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 800 may optionally include one or more arithmetic-logic units (ALUs) 806. 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) .
[0162] The processor 800 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 800) 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) .
[0163] The controller 802 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 800 to cause the processor 800 to support various operations in accordance with examples as described herein. For example, the controller 802 may operate as a control unit of the processor 800, generating control signals that manage the operation of various components of the processor 800. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.
[0164] The controller 802 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 804 and determine a subsequent instruction (s) to be executed to cause the processor 800 to support various operations in accordance with examples as described herein. The controller 802 may be configured to track memory address of instructions associated with the memory 804. The controller 802 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 802 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 800 to cause the processor 800 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 802 may be configured to manage flow of data within the processor 800. The controller 802 may be configured to control transfer of data between registers, ALUs, and other functional units of the processor 800.
[0165] The memory 804 may include one or more caches (e.g., memory local to or included in the processor 800 or other memory, such RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 804 may reside within or on a processor chipset (e.g., local to the processor 800) . In some other implementations, the memory 804 may reside external to the processor chipset (e.g., remote to the processor 800) .
[0166] The memory 804 may store computer-readable, computer-executable code including instructions that, when executed by the processor 800, cause the processor 800 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 802 and / or the processor 800 may be configured to execute computer-readable instructions stored in the memory 804 to cause the processor 800 to perform various functions. For example, the processor 800 and / or the controller 802 may be coupled with or to the memory 804, the processor 800, the controller 802, and the memory 804 may be configured to perform various functions described herein. In some examples, the processor 800 may include multiple processors and the memory 804 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.
[0167] The one or more ALUs 806 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 806 may reside within or on a processor chipset (e.g., the processor 800) . In some other implementations, the one or more ALUs 806 may reside external to the processor chipset (e.g., the processor 800) . One or more ALUs 806 may perform one or more computations such as addition, subtraction, multiplication, and division on data. For example, one or more ALUs 806 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 806 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 806 may support logical operations such as AND, OR, exclusive-OR (XOR) , not-OR (NOR) , and not-AND (NAND) , enabling the one or more ALUs 806 to handle conditional operations, comparisons, and bitwise operations.
[0168] The processor 800 may support wireless communication in accordance with examples as disclosed herein. For example, the processor 800 may be configured to support means for performing the operations as described with respect to FIGs. 1-6.
[0169] For example, the processor 800 may be configured to or operable to support: a means for receiving, from a BS, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; a means for receiving, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and a means for transmitting, to the BS, a measurement report based on the configuration information and the indication.
[0170] For example, the processor 800 may be configured to or operable to support: a means for transmitting, to a UE, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; a means for transmitting, to the UE, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and a means for receiving, from the UE, a measurement report based on the configuration information and the indication.
[0171] It should be appreciated by persons skilled in the art that the components in exemplary processor 800 may be changed, for example, some of the components in exemplary processor 800 may be omitted or modified or a new component (s) may be added to exemplary processor 800, without departing from the spirit and scope of the disclosure. For example, in some embodiments, the processor 800 may not include the ALUs 806.
[0172] FIG. 9 illustrates an example of NE 900 in accordance with aspects of the present disclosure. The NE 900 may include a processor 902, a memory 904, a controller 906, and a transceiver 908. The processor 902, the memory 904, the controller 906, or the transceiver 908, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.
[0173] The processor 902, the memory 904, the controller 906, or the transceiver 908, or various combinations or components thereof may be implemented in hardware (e.g., circuitry) . The hardware may include a processor, a DSP, an ASIC, or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.
[0174] The processor 902 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof) . In some implementations, the processor 902 may be configured to operate the memory 904. In some other implementations, the memory 904 may be integrated into the processor 902. The processor 902 may be configured to execute computer-readable instructions stored in the memory 904 to cause the NE 900 to perform various functions of the present disclosure.
[0175] The memory 904 may include volatile or non-volatile memory. The memory 904 may store computer-readable, computer-executable code including instructions when executed by the processor 902 cause the NE 900 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 904 or another type of memory. 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.
[0176] In some implementations, the processor 902 and the memory 904 coupled with the processor 902 may be configured to cause the NE 900 to perform one or more of the functions described herein (e.g., executing, by the processor 902, instructions stored in the memory 904) . For example, the processor 902 may support wireless communication at the NE 900 in accordance with examples as disclosed herein. For example, the NE 900 may be configured to support means for performing the operations as described with respect to FIGs. 1-6.
[0177] For example, the NE 900 may be configured to or operable to support: a means for transmitting, to a UE, configuration information including at least one of an L1 measurement configuration, an L3 measurement configuration or an LTM candidate configuration for at least one candidate cell; a means for transmitting, to the UE, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate IDs associated with the report configuration; and a means for receiving, from the UE, a measurement report based on the configuration information and the indication.
[0178] The controller 906 may manage input and output signals for the NE 900. The controller 906 may also manage peripherals not integrated into the NE 900. In some implementations, the controller 906 may utilize an operating system such as or other operating systems. In some implementations, the controller 906 may be implemented as part of the processor 902.
[0179] In some implementations, the NE 900 may include at least one transceiver 908. In some other implementations, the NE 900 may have more than one transceiver 908. The transceiver 908 may represent a wireless transceiver. The transceiver 908 may include one or more receiver chains 910, one or more transmitter chains 912, or a combination thereof.
[0180] A receiver chain 910 may be configured to receive signals (e.g., control information, data, or packets) over a wireless medium. For example, the receiver chain 910 may include one or more antennas for receive the signal over the air or wireless medium. The receiver chain 910 may include at least one amplifier (e.g., an LNA) configured to amplify the received signal. The receiver chain 910 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 receiver chain 910 may include at least one decoder for decoding the processing the demodulated signal to receive the transmitted data.
[0181] A transmitter chain 912 may be configured to generate and transmit signals (e.g., control information, data, or packets) . The transmitter chain 912 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 AM, FM, or digital modulation schemes like PSK or QAM. The transmitter chain 912 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 transmitter chain 912 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.
[0182] It should be appreciated by persons skilled in the art that the components in exemplary NE 900 may be changed, for example, some of the components in exemplary NE 900 may be omitted or modified or a new component (s) may be added to exemplary NE 900, without departing from the spirit and scope of the disclosure. For example, in some embodiments, the NE 900 may not include the controller 906.
[0183] Those having ordinary skill in the art would understand that the operations or steps of the methods described in connection with the aspects disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art. Additionally, in some aspects, the operations or steps of the methods may reside as one or any combination or set of codes and / or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
[0184] While this disclosure has been described with specific embodiments thereof, it is evident that many alternatives, modifications, and variations may be apparent to those skilled in the art. The disclosure is not limited to the examples and designs described herein but is to be accorded with the broadest scope consistent with the principles and novel features disclosed herein. For example, various components of the embodiments may be interchanged, added, or substituted in other embodiments. Also, all of the elements of each figure are not necessary for the operation of the disclosed embodiments. For example, one of ordinary skill in the art of the disclosed embodiments would be enabled to make and use the teachings of the disclosure by simply employing the elements of the independent claims. Accordingly, embodiments of the disclosure as set forth herein are intended to be illustrative, not limiting. Various changes may be made without departing from the spirit and scope of the disclosure.
[0185] In this document, the terms "includes, " "including, " or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. The terms "handover" and "cell switch" can be used interchangeably. An element proceeded by "a, " "an, " or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element. Also, the term "another" is defined as at least a second or more. The term "having" or the like, as used herein, is defined as "including. " Expressions such as "A and / or B" or "at least one of A and B" may include any and all combinations of words enumerated along with the expression. For instance, the expression "A and / or B" or "at least one of A and B" may include A, B, or both A and B. The wording "the first, " "the second" or the like is only used to clearly illustrate the embodiments of the present disclosure, but is not used to limit the substance of the present disclosure.
Claims
1.A user equipment (UE) , comprising:at least one memory; andat least one processor coupled with the at least one memory and configured to cause the UE to:receive, from a base station (BS) , configuration information comprising at least one of a layer 1 (L1) measurement configuration, a layer 3 (L3) measurement configuration or an L1 / layer 2 triggered mobility (LTM) candidate configuration for at least one candidate cell;receive, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate identifiers (IDs) associated with the report configuration; andtransmit, to the BS, a measurement report based on the configuration information and the indication.2.The UE of claim 1, wherein the at least one processor is further configured to cause the UE to receive, from the BS, a cell switch command for switching the UE to a first candidate cell of the at least one candidate cell, and the cell switch command indicates activation of a secondary cell (SCell) associated with the first candidate cell.3.The UE of claim 2, wherein the at least one processor is further configured to cause the UE to, in response to receiving the cell switch command or in response to switching the UE to the first candidate cell being completed, perform at least one of:starting a deactivation timer for the SCell; orstarting or restarting a bandwidth part (BWP) inactivity timer associated with an active downlink BWP of the SCell; orwherein the at least one processor is further configured to cause the UE to, in response to switching the UE to the first candidate cell being completed and the SCell being activated, start or restart the BWP inactivity timer associated with an active downlink BWP of the SCell.4.The UE of claim 2, wherein the at least one processor is further configured to cause the UE to:perform a random access channel (RACH) -less cell switch to the first candidate cell, comprising transmitting a first transmission on a configured grant (CG) resource of the first candidate cell or the SCell; andin response to transmitting the first transmission, perform at least one of starting a deactivation timer for the SCell, or starting or restarting a bandwidth part (BWP) inactivity timer associated with an active downlink BWP of the SCell.5.The UE of claim 2, wherein the at least one processor is further configured to cause the UE to:perform a random access channel (RACH) -less cell switch to the first candidate cell, comprising receiving an uplink (UL) grant from the first candidate cell or the SCell; andin response to receiving the UL grant, perform at least one of starting a deactivation timer for the SCell, or starting or restarting a bandwidth part (BWP) inactivity timer associated with an active downlink BWP of the SCell.6.The UE of claim 1, wherein the report configuration indicates a plurality of lists of candidate IDs, and the indication activates or deactivates at least one list of candidate IDs among the plurality of lists of candidate IDs.7.The UE of claim 1, wherein the at least one processor is further configured to cause the UE to, in response to receiving the configuration information:perform at least one of an L1 measurement based on the L1 measurement configuration or evaluating an L1 event associated with the report configuration, regardless of whether the report configuration, the resource configuration or the list of candidate IDs is activated or not; orperform at least one of the L1 measurement based on the L1 measurement configuration or evaluating the L1 event when the resource configuration is activated, regardless of whether the report configuration or the list of candidate IDs is activated or not.8.The UE of claim 1, wherein the at least one processor is further configured to cause the UE to start at least one of performing an L1 measurement based on the L1 measurement configuration or evaluating an L1 event associated with the report configuration until the report configuration, the resource configuration and the list of candidate IDs are activated.9.The UE of claim 1, wherein the report configuration is associated with a semi-persistent channel state information reference signal (SP-CSI-RS) resource, and the indication activates the report configuration and wherein the at least one processor is further configured to cause the UE to discard the indication in response to the SP-CSI-RS resource being in a deactivated state.10.A base station (BS) , comprising:at least one memory; andat least one processor coupled with the at least one memory and configured to cause the BS to:transmit, to a user equipment (UE) , configuration information comprising at least one of a layer 1 (L1) measurement configuration, a layer 3 (L3) measurement configuration or an L1 / layer 2 triggered mobility (LTM) candidate configuration for at least one candidate cell;transmit, to the UE, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate identifiers (IDs) associated with the report configuration; andreceive, from the UE, a measurement report based on the configuration information and the indication.11.The BS of claim 10, wherein the measurement report is a L3 measurement report and is received by a centralized unit (CU) of the BS, and wherein the at least one processor is further configured to cause the BS to:transmit, from the CU to a distributed unit (DU) of the BS, a first message indicating triggering of at least one operation of following operations based on the L3 measurement report: activation or deactivation of at least one secondary cell (SCell) associated with the at least one candidate cell, an early uplink (UL) sync with the at least one SCell, or an early downlink (DL) sync with the at least one SCell.12.The BS of claim 11, wherein the first message is a CU-DU mobility initiation request message.13.The BS of claim 11, wherein the at least one processor is further configured to cause the BS to transmit, from the DU to the UE, a second message for triggering the UE to perform the at least one operation.14.The BS of claim 11, wherein the first message indicates triggering of the early UL sync or the early DL sync, and the first message further indicates beam information or transmission configuration indication (TCI) state information associated with the at least one SCell.15.The BS of claim 11, wherein the first message indicates triggering of the early UL sync, and the at least one processor is further configured to cause the BS to transmit, from the DU to the UE, a physical downlink control channel (PDCCH) order for triggering the UE to perform an early UL sync procedure towards the at least one SCell.16.The BS of claim 11, wherein the first message indicates to switch the UE to a first candidate cell of the at least one candidate cell and triggering of the activation or deactivation of the at least one SCell associated with the first candidate cell, and the first message further indicates beam information or transmission configuration indication (TCI) state information associated with the at least one SCell.17.The BS of claim 10, wherein the report configuration indicates a plurality of lists of candidate IDs, and the indication activates or deactivates at least one list of candidate IDs among the plurality of lists of candidate IDs.18.The BS of claim 10, wherein the report configuration is associated with a semi-persistent channel state information reference signal (SP-CSI-RS) resource, and the indication activates the report configuration and wherein the at least one processor is further configured to cause the BS to activate the SP-CSI-RS resource for the UE before or when transmitting the indication.19.A processor, comprising:at least one memory; andat least one controller coupled with at least one memory and configured to cause the processor to:receive, from a base station (BS) , configuration information comprising at least one of a layer 1 (L1) measurement configuration, a layer 3 (L3) measurement configuration or an L1 / layer 2 triggered mobility (LTM) candidate configuration for at least one candidate cell;receive, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate identifiers (IDs) associated with the report configuration; andtransmit, to the BS, a measurement report based on the configuration information and the indication.20.A method for wireless communication, comprising:receiving, from a base station (BS) , configuration information comprising at least one of a layer 1 (L1) measurement configuration, a layer 3 (L3) measurement configuration or an L1 / layer 2 triggered mobility (LTM) candidate configuration for at least one candidate cell;receiving, from the BS, an indication for activating or deactivating at least one of the following in the L1 measurement configuration: a report configuration, a resource configuration or a list of candidate identifiers (IDs) associated with the report configuration; andtransmitting, to the BS, a measurement report based on the configuration information and the indication.