Random access messages for cancelling active cell timing adjustments

Abstract

Methods, systems, and devices are described for updating a timing advance value for a deactivated cell. A user equipment (UE) may transmit a random access message for a timing advance detection procedure to a first cell that is deactivated. The UE may send the random access message to the first cell. In some examples, the UE may receive, from a second cell, an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message. In other examples, the UE may monitor a random access response (RAR) message from the first cell, the RAR message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message. The UE may communicate with the first cell based on the activation command and the timing advance value.

Description

Cross-references

[0001] This patent application claims the benefit of U.S. patent application No. 17 / 949,924, entitled “RANDOM ACCESSMESSAGE FOR DEACTIVATED CELL TIMING ADJUSTMENTS,” filed by Zhou et al. on September 21, 2022, which is assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0002] The following relates to wireless communications, including a random access message for deactivating cell timing adjustment. Background Art

[0003] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcast, etc. These systems may be able to support communication with multiple users by sharing available system resources (e.g., time, frequency, and power). Examples of such multiple access systems include fourth generation (4G) systems (such as long term evolution (LTE) systems, advanced LTE (LTE-A) systems, or LTE-A Pro systems) and fifth generation (5G) systems (which may be referred to as new radio (NR) systems). These systems may employ techniques such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal FDMA (OFDMA), or discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations, each of which supports wireless communication of a communication device, which may be referred to as a user equipment (UE).

[0004] In some wireless communication systems, a wireless device may receive a timing advance value for communication with one or more cells. However, the timing advance value may become stale, and communication with a cell with a stale timing advance value presents challenges. Summary of the invention

[0005] The described technology relates to improved methods, systems, devices and apparatuses for supporting random access messages for deactivating cell timing adjustment. A user equipment (UE) may be configured with multiple cells, including a deactivated first cell and an activated second cell. The UE may receive a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The UE may send the random access message to the first cell based on the first control signaling. In some examples, the UE may receive an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from the second cell. In other examples, the UE may monitor a random access response message from the first cell, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message. The UE may communicate with the first cell based on the activation command and the timing advance value.

[0006] A method for wireless communication at a user equipment (UE) is described. The method may include: receiving first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to a deactivated first cell; sending the random access message to the first cell based on the first control signaling; receiving an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from a second cell; and communicating with the first cell based on the activation command and the timing advance value.

[0007] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to cause the apparatus to: receive a first control signaling indicating that the UE is to send a random access message for a timing advance detection process to a deactivated first cell; send the random access message to the first cell based on the first control signaling; receive an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from a second cell; and communicate with the first cell based on the activation command and the timing advance value.

[0008] Another apparatus for wireless communication at a UE is described. The apparatus may include: a component for receiving a first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to a deactivated first cell; a component for sending the random access message to the first cell based on the first control signaling; a component for receiving an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from a second cell; and a component for communicating with the first cell based on the activation command and the timing advance value.

[0009] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions that can be executed by a processor to: receive first control signaling indicating that the UE is to send a random access message for a timing advance detection process to a deactivated first cell; send the random access message to the first cell based on the first control signaling; receive an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from a second cell; and communicate with the first cell based on the activation command and the timing advance value.

[0010] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: receiving a second control signaling indicating a set of multiple random access configurations, wherein the first control signaling indicates a first random access configuration in the set of multiple random access configurations; and based on receiving the second control signaling, communicating with the first cell according to the first random access configuration.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the set of multiple random access configurations indicates a set of multiple resources for sending the random access message, the first random access configuration indicates one or more first resources in the set of multiple resources, and sending the random access message includes sending the random access message in the one or more first resources.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving system information signaling indicating a random access resource for performing a random access procedure associated with the first cell; receiving the first control signaling including an indication of a random access preamble associated with the timing advance detection procedure; and wherein sending the random access message includes sending the random access preamble in the random access resource.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: receiving the first control signaling indicating resources used for the timing advance detection process, and wherein sending the random access message includes sending a random access preamble code in these resources used for the timing advance detection process.

[0014] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the random access preamble may be a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving first control signaling indicating that the UE may send one or more repetitions of the random access message; and sending the one or more repetitions of the random access message.

[0016] A method for wireless communication at a UE is described. The method may include: receiving first control signaling, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to a deactivated first cell; sending the random access message to the first cell based on the first control signaling; monitoring a random access response message, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message; and communicating with the first cell based on the activation command and the timing advance value.

[0017] An apparatus for wireless communication at a UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executed by the processor to enable the apparatus to: receive a first control signaling indicating that the UE is to send a random access message for a timing advance detection process to a deactivated first cell; send the random access message to the first cell based on the first control signaling; monitor a random access response message, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message; and communicate with the first cell based on the activation command and the timing advance value.

[0018] Another apparatus for wireless communication at a UE is described. The apparatus may include: a component for receiving a first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to a deactivated first cell; a component for sending the random access message to the first cell based on the first control signaling; a component for monitoring a random access response message, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message; and a component for communicating with the first cell based on the activation command and the timing advance value.

[0019] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions that can be executed by a processor to: receive a first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to a deactivated first cell; send the random access message to the first cell based on the first control signaling; monitor a random access response message, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message; and communicate with the first cell based on the activation command and the timing advance value.

[0020] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: receiving a second control signaling indicating a set of multiple random access configurations, wherein the first control signaling indicates a first random access configuration in the set of multiple random access configurations; and based on receiving the second control signaling, communicating with the first cell according to the first random access configuration.

[0021] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the set of multiple random access configurations indicates a set of multiple resources for sending the random access message, the first random access configuration indicates one or more first resources in the set of multiple resources, and sending the random access message includes sending the random access message in the one or more first resources.

[0022] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving system information signaling indicating a random access resource associated with the first cell; receiving the first control signaling, the first control signaling including an indication of a random access preamble associated with the timing advance detection process; and wherein sending the random access message includes sending the random access preamble in the random access resource.

[0023] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: receiving the first control signaling indicating resources used for the timing advance detection process, and wherein sending the random access message includes sending a random access preamble code in these resources used for the timing advance detection process.

[0024] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the random access preamble may be a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0025] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving the random access response message; and sending a positive acknowledgement based on receiving the random access response message.

[0026] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for the following actions: starting a random access response timer based on sending the random access message; failing to receive the random access response message before the random access response timer expires; and sending an indication to an activated cell that the random access response message was not received.

[0027] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: starting a random access response timer based on sending the random access message; failing to receive the random access response message before the random access response timer expires; and resending the random access message after a backoff delay.

[0028] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may also include operations, features, components, or instructions for: receiving first control signaling indicating that the UE may send one or more repetitions of the random access message; and sending the one or more repetitions of the random access message.

[0029] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first control signaling may be received from an activated cell that may be different from the first cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 An example of a wireless communication system supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is illustrated.

[0031] Figure 2 An example of a wireless communication system supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is illustrated.

[0032] Figure 3 An example of a process flow to support a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is illustrated.

[0033] Figure 4 An example of a process flow to support a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is illustrated.

[0034] Figure 5 and Figure 6 A block diagram of a device supporting a random access message for deactivating cell timing adjustment is shown according to one or more examples as disclosed herein.

[0035] Figure 7 A block diagram of a communications manager supporting random access messages for deactivating cell timing adjustment is shown according to one or more examples as disclosed herein.

[0036] Figure 8 A diagram of a system including a device supporting a random access message for deactivating cell timing adjustment is shown according to one or more examples as disclosed herein.

[0037] Fig. 9 and Fig.10 A flow chart illustrating a method of supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is shown. DETAILED DESCRIPTION

[0038] In the process of wireless communication, a user equipment (UE) may operate in a mobility-configured cell set, which may include an activated cell set (e.g., which may be used to communicate with a network entity) and a deactivated cell set (e.g., including one or more cells, which may include one or more configured cells not used for data communication, control communication, or both, one or more prepared neighboring cells, one or more serving cells not used for data communication, control communication, or both, or any combination thereof). In the process of communication, the UE may have sent a random access message to the activated cell set, and the UE may receive timing advance (TA) information associated with the activated cell set generated based on the random access message. Such TA information may be updated during the communication process between the UE and the activated cell set. However, the TA information for the deactivated cell set may not be constantly updated, resulting in outdated or inaccurate TA information (e.g., due to UE mobility, changes in the communication environment, or other changes).

[0039] In order to reduce or eliminate such inaccurate TA information, the UE may send a random access message to the deactivated cell set to detect the cell set, so that when one or more cells in the deactivated cell set are activated for communication with the UE, the TA information of the deactivated cell set can be obtained. The network entity may send an indication of resource allocation (e.g., dedicated resources for the detection process), configuration, or both to the UE, and the UE may send a random access message to the deactivated cell set. The random access message may include a modified random access preamble (e.g., a dedicated preamble, a preamble configured in advance, or a preamble indicated dynamically). The UE may receive an activation command that may activate one or more deactivated cells, and may also receive a message including the generated TA information, or both. In some examples, the activation command, the TA information, or both may be received in a random access response (RAR) message sent in response to a random access message sent by the UE. The UE may then communicate with one or more cells in the newly activated cells based on the TA information. In this way, the TA information of the deactivated cell may be generated and maintained so that after the activation of the deactivated cell, the UE may communicate with the latest TA information.

[0040] First, various aspects of the disclosure are described in the context of a wireless communication system. Then, various aspects of the disclosure are described with reference to wireless communication systems and process flows. Various aspects of the disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow diagrams related to random access messages for deactivating cell timing adjustment.

[0041] Figure 1An example of a wireless communication system 100 supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is illustrated. The wireless communication system 100 may include one or more network entities 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an Advanced LTE (LTE-A) network, an LTE-A Pro network, a New Radio (NR) network, or a network operating according to other systems and radio technologies (including future systems and radio technologies not explicitly mentioned herein).

[0042] The network entities 105 may be dispersed throughout a geographic area to form the wireless communication system 100 and may include devices in different forms or with different capabilities. In various examples, the network entities 105 may be referred to as network elements, mobility elements, radio access network (RAN) nodes, or network equipment, among other names. In some examples, the network entities 105 and the UE 115 may communicate wirelessly via one or more communication links 125 (e.g., radio frequency (RF) access links). For example, the network entity 105 may support a coverage area 110 (e.g., a geographic coverage area) within which the UE 115 and the network entity 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area within which the network entity 105 and the UE 115 may support signal communications according to one or more radio access technologies (RATs).

[0043] The UEs 115 may be dispersed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be stationary or mobile, or both stationary and mobile at different times. The UEs 115 may be devices in different forms or with different capabilities. Figure 1 Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of supporting communication with various types of devices, such as Figure 1 Communicate with other UEs 115 or network entities 105) as shown.

[0044] As described herein, a node of the wireless communication system 100 (which may be referred to as a network node or a wireless node) may be a network entity 105 (e.g., any network entity described herein), a UE 115 (e.g., any UE described herein), a network controller, an apparatus, a device, a computing system, one or more components, or another suitable processing entity configured to perform any of the techniques described herein. For example, the node may be a UE 115. As another example, the node may be a network entity 105. As another example, a first node may be configured to communicate with a second node or a third node. In one aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a UE 115. In another aspect of this example, the first node may be a UE 115, the second node may be a network entity 105, and the third node may be a network entity 105. In yet other aspects of this example, the first node, the second node, and the third node may be different relative to these examples. Similarly, references to UE 115, network entity 105, apparatus, device, computing system, etc. may include disclosure of UE 115, network entity 105, apparatus, device, computing system, etc. as a network node. For example, a disclosure that UE 115 is configured to receive information from network entity 105 also discloses that the first node is configured to receive information from the second node.

[0045] In some examples, the network entities 105 may communicate with the core network 130, or with each other, or both. For example, the network entities 105 may communicate with the core network 130 via one or more backhaul communication links 120 (e.g., according to S1, N2, N3, or other interface protocols). In some examples, the network entities 105 may communicate with each other directly (e.g., directly between the network entities 105) or indirectly (e.g., via the core network 130) via the backhaul communication links 120 (e.g., according to X2, Xn, or other interface protocols). In some examples, the network entities 105 may communicate with each other via midhaul communication links 162 (e.g., according to a midhaul interface protocol) or fronthaul communication links 168 (e.g., according to a fronthaul interface protocol) or any combination thereof. The backhaul communication links 120, midhaul communication links 162, or fronthaul communication links 168 may be or include one or more wired links (e.g., electrical links, optical fiber links), one or more wireless links (e.g., radio links, wireless optical links), etc. or various combinations thereof. UE 115 may communicate with core network 130 via communication link 155 .

[0046] One or more of the network entities 105 described herein may include or may be referred to as a base station 140 (e.g., a transceiver base station, a radio base station, an NR base station, an access point, a radio transceiver, a Node B, an evolved Node B (eNB), a next generation Node B, or a Gigabit Node B (any of which may be referred to as a gNB), a 5G NB, a next generation eNB (ng-eNB), a Home Node B, a Home Evolved Node B, or other suitable terminology). In some examples, the network entity 105 (e.g., a base station 140) may be implemented in a converged (e.g., monolithic, stand-alone) base station architecture that may be configured to utilize a protocol stack that is physically or logically integrated within a single network entity 105 (e.g., a single RAN node, such as a base station 140).

[0047] In some examples, the network entity 105 may be implemented in a disaggregated architecture (e.g., a disaggregated base station architecture, a disaggregated RAN architecture) that may be configured to utilize a protocol stack that is physically or logically distributed between two or more network entities 105, such as an integrated access backhaul (IAB) network, an open RAN (O-RAN) (e.g., a network configuration initiated by the O-RAN Alliance), or a virtualized RAN (vRAN) (e.g., a cloud RAN (C-RAN)). For example, the network entity 105 may include one or more of the following: a central unit (CU) 160, a distributed unit (DU) 165, a radio unit (RU) 170, a RAN intelligent controller (RIC) 175 (e.g., a near real-time RIC (near RT RIC), a non-real-time RIC (non-RT RIC)), a service management and orchestration (SMO) 180 system, or any combination thereof. The RU 170 may also be referred to as a radio head, a smart radio head, a remote radio head (RRH), a remote radio unit (RRU), or a transmit receive point (TRP). One or more components of the network entity 105 in the decomposed RAN architecture may be co-located, or one or more components of the network entity 105 may be located in distributed locations (e.g., separate physical locations). In some examples, one or more network entities 105 of the decomposed RAN architecture may be implemented as virtual units (e.g., virtual CU (VCU), virtual DU (VDU), virtual RU (VRU)).

[0048] The functional split between CU 160, DU 165, and RU 170 is flexible and may support different functionalities depending on which functions (e.g., network layer functions, protocol layer functions, baseband functions, RF functions, and any combination thereof) are performed at CU 160, DU 165, or RU 170. For example, a functional split of a protocol stack may be employed between CU 160 and DU 165 such that CU 160 may support one or more layers of a protocol stack and DU 165 may support one or more different layers of a protocol stack. In some examples, CU 160 may host higher protocol layer (e.g., Layer 3 (L3), Layer 2 (L2)) functionality and signaling (e.g., Radio Resource Control (RRC), Service Data Adaptation Protocol (SDAP), Packet Data Convergence Protocol (PDCP)). The CU 160 may be connected to one or more DUs 165 or RUs 170, and the one or more DUs 165 or RUs 170 may host lower protocol layers, such as layer 1 (L1) (e.g., physical (PHY) layer) or L2 (e.g., radio link control (RLC) layer, medium access control (MAC) layer) functionality and signaling, and may each be at least partially controlled by the CU 160. Additionally or alternatively, a functional split of the protocol stack may be employed between the DU 165 and the RU 170, such that the DU 165 may support one or more layers of the protocol stack, and the RU 170 may support one or more different layers of the protocol stack. The DU 165 may support one or more different cells (e.g., via one or more RUs 170). In some cases, the functional split between the CU 160 and the DU 165 or between the DU 165 and the RU 170 may be within the protocol layer (e.g., some functions of the protocol layer may be performed by one of the CU 160, DU 165, or RU 170, while other functions of the protocol layer are performed by the other of the CU 160, DU 165, or RU 170). The CU 160 may be further functionally split into CU control plane (CU-CP) functions and CU user plane (CU-UP) functions. The CU 160 may be connected to one or more DUs 165 via midhaul communication links 162 (e.g., F1, F1-c, F1-u), and the DU 165 may be connected to one or more RUs 170 via fronthaul communication links 168 (e.g., open fronthaul (FH) interface). In some examples, midhaul communication link 162 or fronthaul communication link 168 may be implemented according to interfaces (eg, channels) between layers of a protocol stack supported by respective network entities 105 communicating via those communication links.

[0049] In a wireless communication system (e.g., wireless communication system 100), infrastructure and spectrum resources for radio access may support wireless backhaul link capabilities to supplement wired backhaul connections, thereby providing an IAB network architecture (e.g., to a core network 130). In some cases, in an IAB network, one or more network entities 105 (e.g., IAB nodes 104) may be partially controlled by each other. One or more IAB nodes 104 may be referred to as a donor entity or an IAB donor. One or more DUs 165 or one or more RUs 170 may be controlled in part by one or more CUs 160 associated with a donor network entity 105 (e.g., a donor base station 140). One or more donor network entities 105 (e.g., IAB donors) may communicate with one or more additional network entities 105 (e.g., IAB nodes 104) via supported access and backhaul links (e.g., backhaul communication links 120). The IAB node 104 may include an IAB mobile terminal (IAB-MT) controlled (e.g., scheduled) by a coupled IAB donor's DU 165. The IAB-MT may include an independent set of antennas for relaying communications with the UE 115, or may share the same antennas (e.g., of the RU 170) of the IAB node 104 for access via the DU 165 of the IAB node 104 (e.g., referred to as a virtual IAB-MT (vIAB-MT)). In some examples, the IAB node 104 may include a DU 165 that supports communication links with additional entities (e.g., IAB node 104, UE 115) within (e.g., downstream) a relay chain or configuration of the access network. In such cases, one or more components of the decomposed RAN architecture (e.g., one or more IAB nodes 104 or components of the IAB node 104) may be configured to operate according to the techniques described herein.

[0050] For example, an access network (AN) or RAN may include an access node (e.g., an IAB donor), communications between an IAB node 104, and one or more UEs 115. The IAB donor may facilitate connectivity between the core network 130 and the AN (e.g., via a wired or wireless connection to the core network 130). That is, the IAB donor may refer to a RAN node that has a wired or wireless connection to the core network 130. The IAB host may include a CU 160 and at least one DU 165 (e.g., and RU 170), in which case the CU 160 may communicate with the core network 130 via an interface (e.g., a backhaul link). The IAB host and the IAB node 104 may communicate via an F1 interface according to a protocol that defines signaling messages (e.g., an F1 AP protocol). Additionally or alternatively, CU 160 may communicate with the core network via an interface (which may be an example of part of a backhaul link) and may communicate with other CUs 160 (e.g., CUs 160 associated with alternative IAB hosts) via an Xn-C interface (which may be an example of part of a backhaul link).

[0051] An IAB node 104 may refer to a RAN node that provides IAB functionality (e.g., access for UE 115, wireless self-backhaul capabilities, etc.). DU 165 may act as a distributed scheduling node toward child nodes associated with IAB node 104, and IAB-MT may act as a scheduled node toward a parent node associated with IAB node 104. That is, an IAB donor may be referred to as a parent node that communicates with one or more child nodes (e.g., an IAB donor may relay for UE transmissions through one or more other IAB nodes 104). Additionally or alternatively, depending on the relay chain or configuration of the AN, an IAB node 104 may also be referred to as a parent node or child node of other IAB nodes 104. Thus, the IAB-MT entity of the IAB node 104 may provide a Uu interface for the child IAB node 104 to receive signaling from the parent IAB node 104 , and a DU interface (eg, DU 165 ) may provide a Uu interface for the parent IAB node 104 to signal the child IAB node 104 or the UE 115 .

[0052] For example, the IAB node 104 may be referred to as a parent node supporting communications for a child IAB node or as a child node associated with the IAB host, or both. The IAB donor may include a CU 160 having a wired or wireless connection (e.g., backhaul communication link 120) to the core network 130, and may act as a parent node of the IAB node 104. For example, the DU 165 of the IAB host may relay the transmission to the UE 115 through the IAB node 104, or may directly signal the transmission to the UE 115, or both. The CU 160 of the IAB donor may signal the IAB node 104 via the F1 interface that the communication link is established, and the IAB node 104 may schedule the transmission (e.g., the transmission relayed from the IAB donor to the UE 115) via the DU 165. That is, data may be relayed to and from the IAB node 104 via signaling via the NR Uu interface of the MT to the IAB node 104. Communications with the IAB node 104 may be scheduled by the DU 165 of the IAB donor, and communications with the IAB node 104 may be scheduled by the DU 165 of the IAB node 104 .

[0053] In the context of the application of the techniques described herein to a decomposed RAN architecture, one or more components of the decomposed RAN architecture may be configured to support a random access message for deactivating cell timing adjustment as described herein. For example, some operations described as being performed by a UE 115 or a network entity 105 (e.g., a base station 140) may additionally or alternatively be performed by one or more components of the decomposed RAN architecture (e.g., an IAB node 104, a DU 165, a CU 160, a RU 170, a RIC 175, a SMO 180).

[0054] UE 115 may include or may be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable term, where "device" may also be referred to as other examples such as a unit, a station, a terminal, or a client. UE 115 may also include or may be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, UE 115 may include or may be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, etc., which may be implemented in various objects such as appliances or vehicles, meters, and other examples.

[0055] The UE 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may sometimes act as relays, as well as network entities 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples. Figure 1 shown.

[0056] The UE 115 and the network entity 105 may wirelessly communicate with each other via one or more communication links 125 (e.g., access links) using resources associated with one or more carriers. The term "carrier" may refer to a set of RF spectrum resources having a physical layer structure defined for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of an RF spectrum band (e.g., a bandwidth portion (BWP)) that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry acquisition signaling (e.g., synchronization signals, system information), control signaling for coordinating carrier operations, user data, or other signaling. The wireless communication system 100 may support communications with the UE 115 using carrier aggregation or multi-carrier operation. Depending on the carrier aggregation configuration, the UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation may be used for both frequency division duplex (FDD) component carriers and time division duplex (TDD) component carriers. Communication between the network entity 105 and other devices may refer to communication between these devices and any portion (e.g., entity, sub-entity) of the network entity 105. For example, the terms "send," "receive," or "communicate" when referring to the network entity 105 may refer to any portion of the network entity 105 (e.g., base station 140, CU 160, DU 165, RU 170) of the RAN communicating with another device (e.g., directly or via one or more other network entities 105).

[0057] In some examples, such as in a carrier aggregation configuration, a carrier may also have acquisition signaling or control signaling that coordinates the operation of other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute RF Channel Number (EARFCN)) and may be identified based on a channel raster for discovery by UE 115. A carrier may operate in a standalone mode, in which case initial acquisition and connection may be made by UE 115 via the carrier, or a carrier may operate in a non-standalone mode, in which case the connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0058] The communication link 125 shown in the wireless communication system 100 may include downlink transmissions (e.g., forward link transmissions) from the network entity 105 to the UE 115, uplink transmissions (e.g., return link transmissions) from the UE 115 to the network entity 105, or both, among other transmission configurations. A carrier may carry either downlink communications or uplink communications (e.g., in FDD mode), or may be configured to carry both downlink communications and uplink communications (e.g., in TDD mode).

[0059] A carrier may be associated with a particular bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as a "system bandwidth" of the carrier or wireless communication system 100. For example, the carrier bandwidth may be one of a set of bandwidths (e.g., 1.4 megahertz (MHz), 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz) of a carrier of a particular radio access technology. A device (e.g., a network entity 105, a UE 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communications using a particular carrier bandwidth, or may be capable of being configured to support communications using one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a network entity 105 or a UE 115 that supports concurrent communications using carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate using a portion (e.g., a subband, a BWP) or all of a carrier bandwidth.

[0060] The signal waveform transmitted via the carrier may include multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system using MCM technology, a resource element may refer to a resource of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, in which case the symbol period and the subcarrier spacing may be inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both), so that a relatively high number of resource elements (e.g., in the transmission duration) and a relatively high order modulation scheme may correspond to a relatively high communication rate. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers, beams), and the use of multiple spatial resources may increase the data rate or data integrity of communications with UE 115.

[0061] One or more parameter sets for a carrier may be supported, and a parameter set may include a subcarrier spacing ( ) and cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter sets. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communications of a UE 115 may be constrained to one or more active BWPs.

[0062] The time interval for the network entity 105 or the UE 115 may be expressed in multiples of a basic time unit, which may be, for example, a sampling period. seconds, of which can represent the supported subcarrier spacing, and The supported discrete Fourier transform (DFT) size may be indicated. Time intervals of the communication resources may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., in the range of 0 to 1023).

[0063] Each frame may include a plurality of consecutively numbered subframes or time slots, and each subframe or time slot may have the same duration. In some examples, a frame may be divided into subframes (e.g., in the time domain), and each subframe may be further divided into a certain number of time slots. Alternatively, each frame may include a variable number of time slots, and the number of time slots may depend on the subcarrier spacing. Each time slot may include a certain number of symbol periods (e.g., depending on the length of a cyclic prefix added before each symbol period). In some wireless communication systems 100, the time slot may be further divided into a plurality of micro-time slots associated with one or more symbols. Excluding the cyclic prefix, each symbol period may be associated with one or more (e.g., The duration of a symbol period may depend on the subcarrier spacing or the operating frequency band.

[0064] A subframe, a time slot, a mini-time slot, or a symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communication system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 may be dynamically selected (e.g., in a burst of a shortened TTI (sTTI)).

[0065] Physical channels may be multiplexed according to various techniques for communicating using a carrier. Physical control channels and physical data channels may be multiplexed, for example, using one or more of a time division multiplexing (TDM) technique, a frequency division multiplexing (FDM) technique, or a hybrid TDM-FDM technique for signaling via a downlink carrier. A control region (e.g., a control resource set (CORESET)) of a physical control channel may be defined by a set of symbol periods and may extend across a system bandwidth or a subset of a system bandwidth of a carrier. One or more control regions (e.g., CORESETs) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search the control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates in one or more aggregation levels arranged in a cascaded manner. The aggregation level of the control channel candidates may refer to the amount of control channel resources (e.g., control channel elements (CCEs)) associated with coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for transmitting control information to multiple UEs 115 , and a UE-specific search space set for transmitting control information to a specific UE 115 .

[0066] The network entity 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with the network entity 105 (e.g., using a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other identifier) ​​used to distinguish adjacent cells. In some examples, a cell may also refer to a coverage area 110 or a portion of a coverage area 110 (e.g., a sector) on which the logical communication entity operates. Depending on various factors such as the capabilities of the network entity 105, such cells may range from smaller areas (e.g., structures, subsets of structures) to larger areas. For example, a cell may be or may include a building, a subset of a building, or an external space between or overlapping coverage areas 110, and the like.

[0067] A macro cell generally covers a relatively large geographic area (e.g., several kilometers in radius) and may allow unrestricted access to UEs 115 that have service subscriptions with a network provider that supports the macro cell. A small cell may be associated with a lower power network entity 105 (e.g., a lower power base station 140) (compared to a macro cell), and the small cell may operate using the same or different (e.g., licensed, unlicensed) frequency band as the macro cell. A small cell may provide unrestricted access to UEs 115 that have service subscriptions with a network provider, or may provide restricted access to UEs 115 associated with the small cell (e.g., UEs 115 in a closed subscriber group (CSG), UEs 115 associated with users in a home or office). A network entity 105 may support one or more cells, and may also use one or more component carriers to support communications via one or more cells.

[0068] In some examples, a carrier may support multiple cells, and different cells may be configured according to different protocol types (e.g., MTC, narrowband IoT (NB-IoT), enhanced mobile broadband (eMBB)) that may provide access for different types of devices.

[0069] In some examples, the network entities 105 (e.g., base stations 140, RUs 170) may be mobile and, therefore, provide communication coverage for mobile geographic coverage areas 110. In some examples, different coverage areas 110 associated with different technologies may overlap, but the different coverage areas 110 may be supported by the same network entity 105. In some other examples, overlapping coverage areas 110 associated with different technologies may be supported by different network entities 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of network entities 105 provide coverage for respective coverage areas 110 using the same or different radio access technologies.

[0070] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the network entities 105 (e.g., base stations 140) may have similar frame timing, and transmissions from different network entities 105 may be approximately aligned in time. For asynchronous operation, the network entities 105 may have different frame timing, and in some examples, transmissions from different network entities 105 may not be aligned in time. The techniques described herein may be used for synchronous or asynchronous operation.

[0071] Some UEs 115, such as MTC or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technology that allows devices to communicate with each other or with a network entity 105 (e.g., base station 140) without human intervention. In some examples, M2M communication or MTC may include communication from devices that integrate sensors or meters to measure or capture information and relay such information to a central server or application that uses the information or presents the information to a person interacting with the application. Some UEs 115 may be designed to collect information or implement automated behavior of machines or other devices. Examples of applications for MTC devices include: smart metering, inventory monitoring, water level monitoring, equipment monitoring, health care monitoring, wildlife monitoring, weather and geographic event monitoring, queue management and tracking, remote security sensing, physical access control, and transaction-based commercial charging.

[0072] Some UEs 115 may be configured to employ a reduced power consumption mode of operation, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception but does not transmit and receive concurrently). In some examples, half-duplex communication may be performed at a reduced peak rate. Other power saving techniques for UEs 115 include entering a power saving deep sleep mode when not engaged in active communications, operating using limited bandwidth (e.g., according to narrowband communications), or a combination of these techniques. For example, some UEs 115 may be configured to operate using a narrowband protocol type that is associated with a defined portion or range (e.g., a subcarrier or resource block (RB) set) within a carrier, within a guard band of a carrier, or outside a carrier.

[0073] The wireless communication system 100 may be configured to support ultra-reliable communication or low-latency communication or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low-latency communication (URLLC). The UE 115 may be designed to support ultra-reliable, low-latency, or critical functions. Ultra-reliable communications may include private or group communications and may be supported by one or more services such as push-to-talk, video, or data. Support for ultra-reliable, low-latency functions may include prioritization of services, and such services may be used for public safety or general commercial applications. The terms ultra-reliable, low-latency, and ultra-reliable low-latency may be used interchangeably herein.

[0074] In some examples, the UE 115 may be configured to support communication directly with other UEs 115 via a device-to-device (D2D) communication link 135 (e.g., according to a peer-to-peer (P2P), D2D, or sidelink protocol). In some examples, one or more UEs 115 in a group that are performing D2D communication may be within a coverage area 110 of a network entity 105 (e.g., base station 140, RU 170), which may support aspects of such D2D communication configured (e.g., scheduled) by the network entity 105. In some examples, one or more UEs 115 in such a group may be outside of the coverage area 110 of the network entity 105, or may otherwise be unable or not configured to receive transmissions from the network entity 105. In some examples, the group of UEs 115 communicating via D2D communication may support a one-to-many (1:M) system in which each UE 115 transmits to each of the other UEs 115 in the group. In some examples, network entity 105 may facilitate scheduling of resources for D2D communications. In some other examples, D2D communications may be performed between UEs 115 without involving network entity 105.

[0075] In some systems, the D2D communication link 135 can be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, the vehicles can communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these items. The vehicles can signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, vehicles in the V2X system can communicate with roadside infrastructure (such as roadside units), or communicate with the network via one or more network nodes (e.g., network entity 105, base station 140, RU 170) using vehicle-to-network (V2N) communication, or both.

[0076] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or a 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) for managing access and mobility and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) for routing packets or interconnecting to an external network. The control plane entity may manage non-access stratum (NAS) functions such as mobility, authentication, and bearer management of UEs 115 served by network entities 105 (e.g., base stations 140) associated with the core network 130. User IP packets may be delivered through the user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to IP services 150 for one or more network operators. IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0077] The wireless communication system 100 may operate using one or more frequency bands that may be in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). Generally speaking, the region from 300 MHz to 3 GHz is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about one decimeter to one meter in length. UHF waves may be blocked or redirected by buildings and environmental features (which may be referred to as clusters), but these waves may be sufficient to penetrate structures so that macro cells provide service to UEs 115 located indoors. Communications using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than communications using the lower frequencies and longer wavelengths of the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0078] The wireless communication system 100 may also operate using a super high frequency (SHF) region, which may be in the range of 3 GHz to 30 GHz (also known as the centimeter band), or an extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also known as the millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the network entity 105 (e.g., base station 140, RU 170), and the EHF antennas of the corresponding devices may be smaller and closer together than UHF antennas. In some examples, such techniques may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be affected by even greater attenuation and shorter range than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the use of frequency bands specified across these frequency regions may vary by country or regulatory agency.

[0079] The wireless communication system 100 may utilize both licensed RF spectrum bands and unlicensed RF spectrum bands. For example, the wireless communication system 100 may employ license assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology using unlicensed bands (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating using an unlicensed RF spectrum band, devices such as the network entity 105 and the UE 115 may employ carrier sensing for conflict detection and avoidance. In some examples, operations performed using an unlicensed band may be based on a carrier aggregation configuration in conjunction with a component carrier (e.g., LAA) operating using a licensed band. Operations performed using the unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, and the like.

[0080] The network entity 105 (e.g., base station 140, RU 170) or UE 115 may be equipped with multiple antennas that can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of the network entity 105 or UE 115 may be located in one or more antenna arrays or antenna panels, which may support MIMO operations or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be co-located at an antenna assembly, such as an antenna tower. In some examples, antennas or antenna arrays associated with the network entity 105 may be located at different geographical locations. The network entity 105 may include an antenna array having a set of antenna ports of multiple rows and columns that the network entity 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may include one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support RF beamforming for signals sent via the antenna ports.

[0081] The network entity 105 or the UE 115 may use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by sending or receiving multiple signals via different spatial layers. Such a technique may be referred to as spatial multiplexing. The multiple signals may be, for example, sent by a transmitting device via different antennas or different combinations of antennas. Similarly, the multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry information associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers may be associated with different antenna ports for channel measurement and reporting. MIMO techniques include single-user MIMO (SU-MIMO), for which multiple spatial layers are sent to the same receiving device; and multi-user MIMO (MU-MIMO), for which multiple spatial layers are sent to multiple devices.

[0082] Beamforming (which may also be referred to as spatial filtering, directional transmission, or directional reception) is a signal processing technique that may be used at a transmitting device or a receiving device (e.g., a network entity 105, a UE 115) to shape or steer an antenna beam (e.g., a transmit beam, a receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated via antenna elements of an antenna array so that some signals propagating along a particular orientation relative to the antenna array experience constructive interference, while other signals experience destructive interference. Adjustments to signals communicated via antenna elements may include the transmitting device or the receiving device applying an amplitude offset, a phase offset, or both to signals carried via antenna elements associated with the device. Adjustments associated with each of these antenna elements may be defined by a set of beamforming weights associated with a particular orientation (e.g., relative to the antenna array of the transmitting device or the receiving device, or relative to some other orientation).

[0083] The network entity 105 or the UE 115 may use beam scanning techniques as part of a beamforming operation. For example, the network entity 105 (e.g., base station 140, RU 170) may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be sent multiple times by the network entity 105 along different directions. For example, the network entity 105 may send signals according to different sets of beamforming weights associated with different transmission directions. Transmissions along different beam directions may be used to identify (e.g., by a transmitting device such as the network entity 105, or by a receiving device such as the UE 115) beam directions for later transmission or reception by the network entity 105.

[0084] Some signals, such as data signals associated with a particular receiving device, may be transmitted by a transmitting device (e.g., transmitting network entity 105, transmitting UE 115) along a single beam direction (e.g., a direction associated with a receiving device, such as receiving network entity 105 or receiving UE 115). In some examples, a beam direction associated with transmission along a single beam direction may be determined based on signals transmitted along one or more beam directions. For example, UE 115 may receive one or more of the signals transmitted by network entity 105 along different directions, and may report to network entity 105 an indication of the signal received by UE 115 with the highest signal quality or other acceptable signal quality.

[0085] In some examples, transmission by a device (e.g., by network entity 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or beamforming to generate a combined beam for transmission (e.g., from network entity 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured set of beams across a system bandwidth or one or more subbands. Network entity 105 may send a reference signal (e.g., a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS)), which may be precoded or unprecoded. UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., a multi-panel codebook, a linear combination codebook, a port selection codebook). Although these techniques are described with reference to signals sent along one or more directions by a network entity 105 (e.g., base station 140, RU 170), UE 115 may use similar techniques to send signals multiple times along different directions (e.g., to identify a beam direction for subsequent transmission or reception by UE 115), or to send signals along a single direction (e.g., to send data to a receiving device).

[0086] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from a receiving device (e.g., network entity 105), the receiving device (e.g., UE 115) may perform receiving operations (e.g., directional listening) according to multiple receiving configurations. For example, the receiving device may perform reception according to multiple receiving directions by: receiving via different antenna subarrays, processing the received signals according to different antenna subarrays, receiving according to different receiving beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of an antenna array, or processing the received signals according to different receiving beamforming weight sets applied to signals received at multiple antenna elements of an antenna array, any of which may be referred to as "listening" according to different receiving configurations or receiving directions. In some examples, the receiving device may use a single receiving configuration to receive along a single beam direction (e.g., when receiving a data signal). A single receive configuration may be aligned along a beam direction determined based on listening according to different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality based on listening according to multiple beam directions).

[0087] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, the communication at the bearer or PDCP layer may be IP-based. The RLC layer may perform packet segmentation and reassembly to communicate via logical channels. The MAC layer may perform priority processing and multiplexing of logical channels into transport channels. The MAC layer may also implement error detection techniques, error correction techniques, or both to support retransmission to improve link efficiency. In the control plane, the RRC layer may provide the establishment, configuration, and maintenance of an RRC connection that supports a radio bearer for user plane data between the UE 115 and the network entity 105 or the core network 130. The PHY layer may map a transport channel to a physical channel.

[0088] UE 115 and network entity 105 may support retransmission of data to increase the likelihood that the data is successfully received. Hybrid automatic repeat request (HARQ) feedback is a technique for increasing the likelihood of correctly receiving data via a communication link (e.g., communication link 125, D2D communication link 135). HARQ may include a combination of error detection (e.g., using a cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve throughput at the MAC layer under poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support same-slot HARQ feedback, in which case the device may provide HARQ feedback in a specific slot for data received via a previous symbol in the slot. In some other examples, the device may provide HARQ feedback in a subsequent slot or based on some other time interval.

[0089] In some specific implementations, the UE may communicate with one or more activated cells. During such communication, the TA value used for communication with the activated cell may be updated. However, the UE may change position and may establish communication with one or more deactivated cells, but the TA value of such deactivated cells may not have been updated. The UE may send a random access message to the deactivated cell to provide a basis for generating a TA value for the UE to communicate with the deactivated cell. In some examples, the UE may receive an activation command and a TA value from an already activated cell. Additionally or alternatively, the UE may receive an activation command and a TA value in a random access response message sent by the deactivated cell. The UE may then communicate with the newly activated cell based on the TA value. In this way, the TA value used for communication with the deactivated cell may be updated, avoiding problems that exist when using outdated or inaccurate TA values, which may result in interruption and reduced quality of communication.

[0090] Figure 2An example of a wireless communication system 200 supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is illustrated. The wireless communication system 200 may include a UE 115-a, a network entity 105-a, and one or more cells. In some examples, the cells may be organized or identified with various designations, including a primary cell (PCell) designation, a secondary cell (SCell) designation, a PCell+SCell (PSCell) designation, and a PCell+PSCell (SPCell) designation.

[0091] During wireless communication, the network entity 105-a may establish or be associated with a mobility-configured cell set 210 that may support mobility (e.g., layer 1 (L1) / layer 2 (L2) mobility). The network entity 105-a may configure the mobility-configured cell set 210 to include cells that support such mobility (e.g., via control signaling such as RRC signaling). The cells in the mobility-configured cell set 210 may be associated with or may have a PSCell configuration. In some examples, control signaling (e.g., L1 / L2 signaling) may be used to update an SPCell from the mobility-configured cell set 210. Different cells in the mobility-configured cell set 210 may operate on fully overlapping, partially overlapping, or non-overlapping frequencies.

[0092] In some examples, the mobility-configured cell set 210 may include an activated cell set 215 and a deactivated cell set 217. The activated cell set 215 may include serving cells in the mobility-configured cell set 210 that are activated and can be used for data transmission, control transmission, SPCell update, or any combination thereof through control signaling (e.g., L1 / L2 signaling). The deactivated cell set 217 may include one or more deactivated cells (which may be one or more configured cells that are not used for data communication, control communication, or both), one or more prepared neighboring cells, one or more serving cells that are not used for data communication, control communication, or both, or any combination thereof. For example, for cells in the deactivated cell set 217, the UE 115-a may not monitor a downlink control channel or may assign control resources of an uplink control channel (e.g., resources for scheduling requests) to the UE. In some examples, a special situation may occur in which UE 115-a may operate with (or has the capability to operate with) one cell in activated cell set 215, and activation of another cell from mobility configured cell set 210 may involve deactivation of the current serving cell and SPCell switching.

[0093] The deactivated cell set 217 may include a group of serving cells in the mobility configured cell set 210, the group of serving cells may not be used for data transmission and reception, control signaling transmission and reception, or both, but may be activated and used for SPCell update through control signaling (e.g., L1 / L2 signaling), and measurement reports (e.g., L1 measurement reports) may be provided for the group of serving cells. In some examples, some or all of the cells that are not activated in the mobility configured cell set 210 may be included in the deactivated cell set 217.

[0094] In some examples, a network entity 105-a or other device may assign a timing advance (TA) group (TAG) to a UE 115-a, and the UE 115-a may obtain one or more initial TAs via a RAR message during a random access procedure (e.g., a random access channel (RACH) procedure). For example, the UE 115-a may initiate a random access procedure to a cell (e.g., a PCell). The UE 115-a may receive control signaling (e.g., a PDCCH instruction) to initiate a random access procedure with another cell (e.g., a SCell). The TA information or value may be used, for example, to adjust one or more timing parameters for communication between the UE 115-a and a cell (e.g., an activated cell 220 or a deactivated cell 225 that may optionally be activated via the techniques described herein). In some examples, the UE 115-a may perform a single random access procedure for one cell per TAG (e.g., because cells within a TAG may use the same TA information for communication with the UE 115-a).

[0095] The TA information of the cells in the TAG including the activated cells 220 may be updated (e.g., periodically) via control signaling (e.g., TA MAC-CE signaling sent from a network entity). However, in other approaches, the TA information of the TAG including only the deactivated cells may not be constantly updated. As a result, the initial TA information about those cells may be out of date or inaccurate due to the mobility of the UE 115-a, changes in radio conditions, or other factors.

[0096] Thus, the subject matter described herein considers technical difficulties in maintaining TA information in a mobility setting (e.g., an L1 / L2 mobility setting). The subject matter described herein includes techniques for an efficient TA estimation process for a TAG that includes all deactivated cells. For example, such techniques may include TA probing based on a random access procedure for deactivated cells. Different options of behavior (e.g., network entity 105-a behavior, UE 115-a behavior, behavior of other devices, or any combination thereof) may be discussed for estimating one or more TA values. In addition, the subject matter described herein may include resource allocation considerations and control signaling considerations (e.g., RRC configuration considerations).

[0097] In some examples, UE 115-a may receive first control signaling 230 (e.g., from activated cell 220), which may indicate that UE 115-a is to send a random access message 235 to deactivated cell 225 for a TA detection process. In some examples, first control signaling 230 may be RRC signaling. The first control signaling 230 may configure one or more parameters for the TA detection process, including TA estimation options, random access resources in terms of time, frequency, spatial relationship, or any combination thereof, one or more random access preambles to be sent in the random access message 235, a burst length, periodicity, or both for sending semi-persistent random access message 235 bursts, a RAR message timer parameter (e.g., indicating how long UE115-a should wait to receive a RAR before engaging in a retransmission or reporting a RAR failure), a backoff or delay parameter (e.g., a random delay parameter) that should be adopted in a situation where a random access message 235 is sent and a RAR message 250 is not received after expiration of the RAR timer, one or more other parameters for performing the TA detection process, or any combination thereof. In some examples, one or more parameters may be configured by first control signaling 230 (which may be RRC signaling), other control signaling (e.g., RRC signaling), or both, and the one or more parameters may be modified by additional control signaling (e.g., MAC-CE signaling or DCI signaling) to select or switch between one or more configurations for the TA detection process.

[0098] As part of the TA detection process, the UE 115-a may send a random access message 235 to one of the deactivated cells 225. In response, a device associated with the deactivated cell 225 may generate a TA value 245 based on receiving the random access message. The TA value 245 may then be communicated to the UE 115-a.

[0099] For example, the UE 115-a may receive an activation command 240 and a TA value 245 from an activated cell 220 in the set of activated cells 215. The activation command 240 may activate the deactivated cell 225 to which the UE 115-a sent the random access message 235, and the TA value 245 may indicate a timing adjustment for the UE 115-a for communications between the UE 115-a and the deactivated cell 225. However, in other examples, the UE 115-a may monitor for a RAR message 250 that may include the activation command 240 and the TA value 245. In either case, the UE 115-a may communicate with the deactivated cell 225 based on the activation command and the timing advance value.

[0100] In this manner, a TA probing procedure may be performed to generate or update a TA value 245 for communications with a deactivated cell 225, thereby providing improved communication reliability and speed due to an updated or accurate TA value 245. For example, a UE 115-a may communicate with a deactivated cell 225 for which it received an activation command via an uplink control channel (e.g., by transmitting a scheduling request) without transmitting an additional random access message to the cell.

[0101] Figure 3 An example of a process flow 300 for supporting a random access message for deactivating a cell timing adjustment according to one or more examples as disclosed herein is illustrated. The process flow 300 may implement various aspects of the present disclosure described herein, including a method in which a second cell 315 sends an activation command and a TA value to a UE 115-b. The elements described in the process flow 300 may be examples of similarly named elements described herein.

[0102] In the following description of process flow 300, operations between various entities or elements may be performed in different orders or at different times. Some operations may also be excluded from process flow 300, or other operations may be added. For example, one or more operations of process flow 400 may be incorporated into process flow 300, and the description of any operation or element of process flow 400 may be equally applicable to the operation or element of process flow 300. Although various entities or elements are shown as performing operations of process flow 300, some aspects of some operations may also be performed by other entities or elements of process flow 300 or by entities or elements not depicted in the process flow, or any combination thereof.

[0103] The process flow 300 may depict an example in which a UE 115-b receives a control signaling instruction or command (e.g., a first control signaling) to trigger a random access procedure for deactivating TA estimation at a cell (e.g., a first cell 310). In the process flow 300, the UE 115-a may receive an activation command and a TA value from a second cell 315.

[0104] At 320, UE 115-b may receive second control signaling indicating a plurality of random access configurations, and the first control signaling may indicate a first random access configuration of the plurality of random access configurations. In some examples, the plurality of random access configurations may indicate a plurality of resources for sending a random access message. In some examples, the first random access configuration may indicate one or more first resources of the plurality of resources.

[0105] The random access resources may be characterized by time resources, frequency resources, space domain resources, or any combination thereof. In some examples, the random access resources may be resources dedicated to the TA detection process. Such resources may be defined in time, frequency, space, or any combination thereof and may be indicated in a first control signaling (e.g., which may be a physical downlink control channel (PDCCH) instruction or indication). Additionally or alternatively, the random access resources may be random access resources configured for UE 115-b for a random access process that is not associated with the TA detection process (e.g., resources received by the UE from a system information (SI) broadcast).

[0106] In some examples, the second control signaling (e.g., which may be RRC signaling) may configure dedicated resources for the TA detection process. For example, the second control signaling may indicate multiple configurations, and the network entity may send control signaling (e.g., first control signaling, which may optionally be MAC-CE signaling or DCI signaling) to select or switch between configurations.

[0107] In some examples, UE 115-b may send one or more messages confirming or indicating that the configuration or reconfiguration has been completed, and may be sent based on receiving second control signaling, system information, or both.

[0108] At 325 , the UE 115 - b may receive system information signaling indicating random access resources for performing a random access procedure associated with the first cell 310 .

[0109] At 330, UE 115-b may receive first control signaling from second cell 315, the first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to the deactivated first cell 310. In some examples, UE 115-b may receive the first control signaling, which may include an indication of a random access preamble associated with the timing advance detection procedure. In some examples, UE 115-b may receive the first control signaling indicating resources for the timing advance detection procedure. In some examples, UE 115-b may receive the first control signaling indicating that the UE is to send one or more repetitions of the random access message.

[0110] The first control signaling may provide one or more indications for selecting or switching between one or more configurations for the TA detection process. While the second control signaling may indicate one or more resources used in the TA detection process, the second control signaling may additionally or alternatively indicate one or more random access resources, random access preambles, or both used in the TA detection process.

[0111] For example, if the UE 115-b is instructed to use random access resources for a random access procedure that is not associated with a TA detection procedure (e.g., those resources received via system information), the UE 115-b may receive one or more preambles that may be sent in a random access message that are dedicated for use in association with the TA detection procedure. Additionally or alternatively, if the UE 115-b is instructed to use random access resources that are dedicated for a TA detection procedure, the UE 115-b may employ one or more different options for the random access message preambles. For example, the UE 115-b may send one or more unspecified preambles, which may be random preambles preconfigured for contention-based random access (CBRA). Additionally or alternatively, UE 115-b may send one or more designated preambles, which may be one or more CBRA preambles selected or indicated, or may be a dedicated contention-free random access (CFRA) preamble (e.g., which may be provided or indicated by control signaling including first control signaling, second control signaling, or other signaling, any of which may be RRC control signaling, PDCCH signaling, or other control signaling).

[0112] In some examples, UE 115-b may be instructed to send one or more repetitions of a random access message or a burst of multiple random access messages. Such repetitions or bursts may improve the reliability of the TA detection process, thereby providing the first cell 310 with multiple opportunities to receive the random access message. In some examples, the UE may send the random access message in a semi-persistent manner, or may periodically send the random access message (e.g., with Periodicity in ms ).

[0113] In some examples, the first control signaling may be a PDCCH command or a MAC-CE control signaling. In any case, the first control signaling may include one or more bits (e.g., bits previously reserved in other methods) to indicate whether the first control signaling is used to trigger a random access procedure associated with a TA detection procedure.

[0114] At 335, UE 115-b may send a random access message to the first cell 310 based on the first control signaling. In some examples, sending the random access message includes sending the random access message in one or more first resources. In some examples, sending the random access message includes sending a random access preamble in the random access resources. In some examples, sending the random access message includes sending a random access preamble in resources used for a timing advance detection process. In some examples, the random access preamble may be a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0115] At 340, UE 115-b may send one or more repetitions of the random access message. In some examples, a network entity associated with the first cell 310 may generate or update one or more TA values ​​or TA information based on receiving the random access message.

[0116] At 345 , the UE 115 - b may receive, from the second cell 315 , an activation command to activate the first cell 310 and an indication of a timing advance value for the first cell 310 generated based on the random access message.

[0117] At 350, UE 115-b may communicate with first cell 310 based on the activation command and the timing advance value. In some examples, UE 115-b may communicate with first cell 310 according to the first random access configuration based on receiving the second control signaling.

[0118] Figure 4 An example of a process flow 400 for supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is illustrated. The process flow 400 may implement various aspects of the disclosure described herein. The elements described in the process flow 400 may be examples of similarly named elements described herein.

[0119] In the following description of process flow 400, operations between various entities or elements may be performed in different orders or at different times. Some operations may also be excluded from process flow 400, or other operations may be added. For example, one or more operations of process flow 300 may be incorporated into process flow 400, and the description of any operation or element of process flow 300 may be equally applicable to the operation or element of process flow 400. Although various entities or elements are shown as performing operations of process flow 400, some aspects of some operations may also be performed by other entities or elements of process flow 400 or by entities or elements not depicted in the process flow, or any combination thereof.

[0120] Process flow 400 may depict an example in which UE 115-c receives a control signaling instruction or command (e.g., first control signaling) to trigger a random access procedure for deactivating TA estimation at a cell (e.g., first cell 310-a). In process flow 300, UE 115-a may receive an activation command and a TA value from the first cell 310-a in a random access response message. Some steps of the process flow may be the same, similar, or related to one or more steps of process flow 300, and the discussion of such steps in process flow 300 may also apply to the steps of process flow 400.

[0121] At 420, UE 115-c may receive second control signaling indicating a plurality of random access configurations, and the first control signaling may indicate a first random access configuration of the plurality of random access configurations. In some examples, the plurality of random access configurations may indicate a plurality of resources for sending a random access message. In some examples, the first random access configuration may indicate one or more first resources of the plurality of resources.

[0122] At 425 , the UE 115 - c may receive system information signaling indicating random access resources for performing a random access procedure associated with the first cell 310 - a .

[0123] At 430, the UE 115-c may receive first control signaling from the second cell 315-a, the first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to the deactivated first cell 310-a. In some examples, the UE 115-c may receive the first control signaling, which may include an indication of a random access preamble associated with the timing advance detection procedure. In some examples, the UE 115-c may receive the first control signaling indicating resources for the timing advance detection procedure. In some examples, the UE 115-c may receive the first control signaling indicating that the UE is to send one or more repetitions of the random access message. In some examples, the first control signaling may be received from an activated cell different from the first cell 310-a (e.g., the second cell 315-a).

[0124] At 435, UE 115-c may send a random access message to the first cell 310-a based on the first control signaling. In some examples, sending the random access message includes sending the random access message in one or more first resources. In some examples, sending the random access message includes sending a random access preamble in the random access resources. In some examples, sending the random access message includes sending a random access preamble in resources used for a timing advance detection process. In some examples, the random access preamble may be a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0125] At 440, the UE 115-c may send one or more repetitions of the random access message.

[0126] At 445, the UE 115-c may start a random access response timer based on sending the random access message. For example, the UE 115-c may start a random access response timer (e.g., with a length of 445) (e.g., at or after sending the random access message or any repetition or retransmission thereof). ). For example, if UE 115-c sends one or more repetitions of a random access message or a burst of random access messages, UE 115-c may start a random access response timer after sending the first message, the last message, or any other message.

[0127] At 450, the UE 115-c may monitor for a random access response message from the first cell 310-a, and the random access response message may include an activation command to activate the first cell 310-a and an indication of a timing advance value generated based on the random access message.

[0128] At 455, UE 115-c may fail to receive the random access response message before the random access response timer expires.

[0129] At 460, the UE 115-c may send an indication that the random access response message was not received to the activated cell (e.g., the second cell 315-a). For example, if the UE 115-c does not receive the random access response message before the random access response timer expires, the UE 115-c may send an indication that the random access response message was not received (e.g., a random access response failure indication) (e.g., to the second cell 315-a or another cell, either of which may be an activated cell).

[0130] At 465, the UE 115-c may resend the random access message after the backoff delay. For example, if the UE 115-c does not receive the random access response message before the random access response timer expires, the UE 115-c may optionally resend the random access message at (e.g., time The random access message is resent after a backoff delay or a random delay.

[0131] At 470, the UE 115-c may receive a random access response message. In some examples, the random access response message may include an activation command, one or more TA values, or both. The activation command may activate the cell to which the UE 115-c has sent the random access message (e.g., the first cell 310-a). In some examples, the first cell 310-a may be updated to become an SPCell. In some examples, the random access response message may not include or may omit one or more uplink grants (e.g., compared to a random access response message that may be received during a random access procedure that is not associated with a TA detection procedure). In some examples, the UE 115-c may receive and store the TA value, other TA information, or both in the random access response message. The UE 115-c may use the TA value, other TA information, or both for uplink transmission (e.g., in the case where the random access message does not include an activation command and the second cell 315-a or other activated cell may send an activation command to the UE 115-c).

[0132] At 475 , UE 115 - c may send a positive acknowledgement based on receiving the random access response message.

[0133] At 480, the UE 115-c may communicate with the first cell 310-a based on the activation command and the timing advance value. In some examples, the UE 115-c may communicate with the first cell 310-a according to the first random access configuration based on receiving the second control signaling.

[0134] Figure 5 A block diagram 500 of a device 505 supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is shown. The device 505 may be an example of aspects of a UE 115 as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communication manager 520. The device 505 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0135] The receiver 510 may provide means for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., a control channel, a data channel, an information channel related to a random access message for deactivating a cell timing adjustment). The information may be communicated to other components of the device 505. The receiver 510 may utilize a single antenna or a collection of multiple antennas.

[0136] The transmitter 515 may provide means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., control channels, data channels, information channels related to random access messages for deactivating cell timing adjustments). In some examples, the transmitter 515 may be co-located with the receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a collection of multiple antennas.

[0137] The communication manager 520, the receiver 510, the transmitter 515, or various combinations thereof, or various components thereof, may be examples of means for performing various aspects of the random access message for deactivating cell timing adjustment as described herein. For example, the communication manager 520, the receiver 510, the transmitter 515, or various combinations thereof, or components thereof, may support methods for performing one or more of the functions described herein.

[0138] In some examples, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in hardware (e.g., in a communication management circuit). The hardware may include a processor, a digital signal processor (DSP), a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a microcontroller, discrete gate or transistor logic, discrete hardware components, or any combination thereof that is configured as or otherwise supports components for performing the functions described in the present disclosure. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing instructions stored in the memory by the processor).

[0139] Additionally or alternatively, in some examples, the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communication management software or firmware). If implemented in code executed by a processor, the functionality of the communication manager 520, the receiver 510, the transmitter 515, or various combinations or components thereof may be performed by a general purpose processor (e.g., configured as or otherwise supporting components for performing the functionality described in the present disclosure), a DSP, a CPU, an ASIC, an FPGA, a microcontroller, or any combination of these or other programmable logic devices.

[0140] In some examples, communication manager 520 may be configured to perform various operations (e.g., receive, obtain, monitor, output, transmit) using or otherwise cooperating with receiver 510, transmitter 515, or both. For example, communication manager 520 may receive information from receiver 510, transmit information to transmitter 515, or be integrated with receiver 510, transmitter 515, or both to obtain information, output information, or perform various other operations as described herein.

[0141] Additionally or alternatively, according to the examples disclosed herein, the communication manager 520 may support wireless communication at the UE. For example, the communication manager 520 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The communication manager 520 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The communication manager 520 may be configured as or otherwise support a component for receiving an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from the second cell. The communication manager 520 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0142] Additionally or alternatively, according to the examples disclosed herein, the communication manager 520 may support wireless communication at the UE. For example, the communication manager 520 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The communication manager 520 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The communication manager 520 may be configured as or otherwise support a component for monitoring a random access response message from the first cell, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message. The communication manager 520 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0143] By including or configuring a communication manager 520 according to examples as described herein, a device 505 (e.g., a processor controlling or otherwise coupled to a receiver 510, a transmitter 515, a communication manager 520, or a combination thereof) may support techniques for reducing processing, reducing power consumption, more efficiently utilizing communication resources, or any combination thereof.

[0144] Figure 6 A block diagram 600 of a device 605 supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is shown. The device 605 may be an example of aspects of the device 505 or UE 115 as described herein. The device 605 may include a receiver 610, a transmitter 615, and a communication manager 620. The device 605 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0145] The receiver 610 may provide means for receiving information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., a control channel related to a random access message for deactivating cell timing adjustment, a data channel, an information channel). The information may be communicated to other components of the device 605. The receiver 610 may utilize a single antenna or a collection of multiple antennas.

[0146] The transmitter 615 may provide means for transmitting signals generated by other components of the device 605. For example, the transmitter 615 may transmit information (such as packets, user data, control information, or any combination thereof) associated with various information channels (e.g., a control channel, a data channel, an information channel related to a random access message for deactivating a cell timing adjustment). In some examples, the transmitter 615 may be co-located with the receiver 610 in a transceiver module. The transmitter 615 may utilize a single antenna or a collection of multiple antennas.

[0147] The device 605 or its various components may be examples of components for performing various aspects of the random access message for deactivating cell timing adjustment as described herein. For example, the communication manager 620 may include a control signaling component 625, a random access message component 630, an activation component 635, an activated communication component 640, a random access response message component 645, or any combination thereof. The communication manager 620 may be an example of various aspects of the communication manager 520 as described herein. In some examples, the communication manager 620 or its various components may be configured to use or otherwise cooperate with the receiver 610, the transmitter 615, or both to perform various operations (e.g., receive, obtain, monitor, output, send). For example, the communication manager 620 may receive information from the receiver 610, transmit information to the transmitter 615, or be integrated with the receiver 610, the transmitter 615, or both to obtain information, output information, or perform various other operations as described herein.

[0148] According to examples as disclosed herein, the communication manager 620 may support wireless communications at the UE. The control signaling component 625 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The random access message component 630 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The activation component 635 may be configured as or otherwise support a component for receiving an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from the second cell. The activated communication component 640 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0149] Additionally or alternatively, according to examples as disclosed herein, the communication manager 620 may support wireless communication at the UE. The control signaling component 625 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The random access message component 630 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The random access response message component 645 may be configured as or otherwise support a component for monitoring a random access response message from the first cell, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message. The activated communication component 640 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0150] Figure 7 A block diagram 700 of a communication manager 720 supporting random access messages for deactivating cell timing adjustment according to one or more examples as disclosed herein is shown. The communication manager 720 may be an example of aspects of the communication manager 520, the communication manager 620, or both as described herein. The communication manager 720 or its various components may be examples of components for performing various aspects of random access messages for deactivating cell timing adjustment as described herein. For example, the communication manager 720 may include a control signaling component 725, a random access message component 730, an activation component 735, an activated communication component 740, a random access response message component 745, a random access configuration component 750, a random access preamble component 755, a repetition component 760, a random access response message timer component 765, or any combination thereof. Each of these components may communicate with each other directly or indirectly (e.g., via one or more buses).

[0151] Additionally or alternatively, according to examples as disclosed herein, the communication manager 720 may support wireless communication at the UE. The control signaling component 725 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The random access message component 730 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The activation component 735 may be configured as or otherwise support a component for receiving an activation command from the second cell to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message. The activated communication component 740 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0152] In some examples, random access configuration component 750 may be configured as or otherwise support means for receiving a second control signaling indicating a set of multiple random access configurations, wherein the first control signaling indicates a first random access configuration in the set of multiple random access configurations. In some examples, activated communication component 740 may be configured as or otherwise support means for communicating with the first cell according to the first random access configuration based on receiving the second control signaling.

[0153] In some examples, the set of multiple random access configurations indicates a set of multiple resources for sending a random access message. In some examples, the first random access configuration indicates one or more first resources in the set of multiple resources. In some examples, sending a random access message includes sending the random access message in the one or more first resources.

[0154] In some examples, the control signaling component 725 can be configured as or otherwise support means for receiving system information signaling indicating a random access resource for performing a random access procedure associated with a first cell. In some examples, the random access message component 730 can be configured as or otherwise support means for receiving a first control signaling including an indication of a random access preamble associated with a timing advance detection procedure. In some examples, the random access message component 730 can be configured as or otherwise support means for sending a random access message including sending a random access preamble in a random access resource.

[0155] In some examples, control signaling component 725 may be configured as or otherwise support means for receiving first control signaling indicating resources for a timing advance detection procedure. In some examples, random access preamble component 755 may be configured as or otherwise support means for sending a random access message including sending a random access preamble in resources for a timing advance detection procedure.

[0156] In some examples, the random access preamble is a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0157] In some examples, the repetition component 760 may be configured as or otherwise support a component for receiving a first control signaling from a second cell indicating that the UE is to send one or more repetitions of a random access message. In some examples, the repetition component 760 may be configured as or otherwise support a component for sending one or more repetitions of a random access message.

[0158] Additionally or alternatively, according to the examples disclosed herein, the communication manager 720 may support wireless communication at the UE. In some examples, the control signaling component 725 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. In some examples, the random access message component 730 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The random access response message component 745 may be configured as or otherwise support a component for monitoring a random access response message from the first cell, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message. In some examples, the activated communication component 740 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0159] In some examples, random access configuration component 750 may be configured as or otherwise support means for receiving a second control signaling indicating a set of multiple random access configurations, wherein the first control signaling indicates a first random access configuration in the set of multiple random access configurations. In some examples, activated communication component 740 may be configured as or otherwise support means for communicating with the first cell according to the first random access configuration based on receiving the second control signaling.

[0160] In some examples, the set of multiple random access configurations indicates a set of multiple resources for sending a random access message. In some examples, the first random access configuration indicates one or more first resources in the set of multiple resources. In some examples, sending a random access message includes sending the random access message in the one or more first resources.

[0161] In some examples, the control signaling component 725 can be configured as or otherwise support means for receiving system information signaling indicating a random access resource associated with the first cell. In some examples, the random access message component 730 can be configured as or otherwise support means for receiving a first control signaling including an indication of a random access preamble associated with a timing advance detection procedure. In some examples, the random access message component 730 can be configured as or otherwise support means for sending a random access message including sending a random access preamble in a random access resource.

[0162] In some examples, control signaling component 725 may be configured as or otherwise support means for receiving first control signaling indicating resources for a timing advance detection procedure. In some examples, random access preamble component 755 may be configured as or otherwise support means for sending a random access message including sending a random access preamble in resources for a timing advance detection procedure.

[0163] In some examples, the random access preamble is a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0164] In some examples, the random access response message component 745 can be configured as or otherwise support means for receiving a random access response message. In some examples, the random access response message component 745 can be configured as or otherwise support means for sending a positive acknowledgement based on receiving the random access response message.

[0165] In some examples, the random access response message timer component 765 may be configured as or otherwise support a component for starting a random access response timer based on sending a random access message. In some examples, the random access response message timer component 765 may be configured as or otherwise support a component for failing to receive a random access response message before the random access response timer expires. In some examples, the random access response message timer component 765 may be configured as or otherwise support a component for sending an indication to an activated cell that a random access response message was not received.

[0166] In some examples, the random access response message timer component 765 may be configured as or otherwise support a component for starting a random access response timer based on sending a random access message. In some examples, the random access response message timer component 765 may be configured as or otherwise support a component for failing to receive a random access response message before the random access response timer expires. In some examples, the random access message component 730 may be configured as or otherwise support a component for resending a random access message after a backoff delay.

[0167] In some examples, the repetition component 760 may be configured as or otherwise support a component for receiving a first control signaling from a second cell indicating that the UE is to send one or more repetitions of a random access message. In some examples, the repetition component 760 may be configured as or otherwise support a component for sending one or more repetitions of a random access message.

[0168] In some examples, the first control signaling is received from an activated cell different from the first cell.

[0169] Figure 8 A diagram of a system 800 including a device 805 supporting a random access message for deactivating cell timing adjustment according to one or more examples as disclosed herein is shown. The device 805 may be an example of a device 505, a device 605, or a UE 115 as described herein, or include components thereof. The device 805 may communicate (e.g., wirelessly) with one or more network entities 105, one or more UEs 115, or any combination thereof. The device 805 may include components for two-way voice and data communications, including components for sending and receiving communications, such as a communication manager 820, an input / output (I / O) controller 810, a transceiver 815, an antenna 825, a memory 830, a code 835, and a processor 840. These components may be electronically communicated or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more buses (e.g., a bus 845).

[0170] The I / O controller 810 can manage the input and output signals of the device 805. The I / O controller 810 can also manage peripheral devices that are not integrated into the device 805. In some cases, the I / O controller 810 can represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 810 can utilize an operating system such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX® or another known operating system. Additionally or alternatively, the I / O controller 810 can represent or interact with a modem, keyboard, mouse, touch screen or similar device. In some cases, the I / O controller 810 can be implemented as a part of a processor such as a processor 840. In some cases, a user can interact with the device 805 via the I / O controller 810 or via the hardware components controlled by the I / O controller 810.

[0171] In some cases, the device 805 may include a single antenna 825. However, in some other cases, the device 805 may have more than one antenna 825, which can send or receive multiple wireless transmissions concurrently. The transceiver 815 can communicate bidirectionally via one or more antennas 825, wired or wireless links, as described herein. For example, the transceiver 815 may represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. The transceiver 815 may also include a modem for: modulating packets; providing the modulated packets to one or more antennas 825 for transmission; and demodulating packets received from one or more antennas 825. The transceiver 815 or the transceiver 815 and one or more antennas 825 can be examples of transmitters 515, transmitters 615, receivers 510, receivers 610, or any combination thereof or components thereof as described herein.

[0172] The memory 830 may include random access memory (RAM) and read-only memory (ROM). The memory 830 may store computer-readable, computer-executable code 835 including instructions that, when executed by the processor 840, cause the device 805 to perform various functions described herein. The code 835 may be stored in a non-transitory computer-readable medium such as a system memory or another type of memory. In some cases, the code 835 may not be directly executable by the processor 840, but may (for example, when compiled and executed) cause the computer to perform the functions described herein. In some cases, the memory 830 may also contain, among other things, a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0173] The processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 840 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 840. The processor 840 may be configured to execute computer-readable instructions stored in a memory (e.g., a memory 830) so that the device 805 performs various functions (e.g., supporting various functions or tasks of a random access message for deactivating cell timing adjustment). For example, the device 805 or a component of the device 805 may include a processor 840 and a memory 830 coupled to or coupled to the processor 840, and the processor 840 and the memory 830 are configured to perform the various functions described herein.

[0174] Additionally or alternatively, according to the examples disclosed herein, the communication manager 820 may support wireless communication at the UE. For example, the communication manager 820 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The communication manager 820 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The communication manager 820 may be configured as or otherwise support a component for receiving an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message from the second cell. The communication manager 820 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0175] Additionally or alternatively, according to the examples disclosed herein, the communication manager 820 may support wireless communication at the UE. For example, the communication manager 820 may be configured as or otherwise support a component for receiving a first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to the deactivated first cell. The communication manager 820 may be configured as or otherwise support a component for sending a random access message to the first cell based on the first control signaling. The communication manager 820 may be configured as or otherwise support a component for monitoring a random access response message from the first cell, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message. The communication manager 820 may be configured as or otherwise support a component for communicating with the first cell based on the activation command and the timing advance value.

[0176] By including or configuring a communications manager 820 according to the examples described herein, the device 805 may support techniques for improving communications reliability, reducing latency, improving user experience associated with reduced processing, reducing power consumption, more efficiently utilizing communications resources, improving coordination between devices, extending battery life, improving utilization of processing power, or any combination thereof.

[0177] In some examples, the communication manager 820 may be configured to perform various operations (e.g., receive, monitor, transmit) using or otherwise cooperating with the transceiver 815, one or more antennas 825, or any combination thereof. Although the communication manager 820 is illustrated as a separate component, in some examples, one or more functions described with reference to the communication manager 820 may be supported or performed by the processor 840, the memory 830, the code 835, or any combination thereof. For example, the code 835 may include instructions executable by the processor 840 to cause the device 805 to perform various aspects of the random access message for deactivating cell timing adjustment as described herein, or the processor 840 and the memory 830 may be otherwise configured to perform or support such operations.

[0178] Fig. 9 A flowchart illustrating a method 900 for supporting a random access message for deactivating cell timing adjustment according to one or more examples disclosed herein is shown. The operations of the method 900 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 900 may be implemented by a UE or a component thereof as described herein. Figures 1 to 8 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0179] At 905, the method may include: receiving first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to the deactivated first cell. The operation of 905 may be performed according to the examples disclosed herein. In some examples, aspects of the operation of 905 may be performed as described in reference Figure 7 The control signaling component 725 is used to execute.

[0180] At 910, the method may include: sending a random access message to the first cell based on the first control signaling. The operations of 910 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 910 may be performed as described in reference to Figure 7 The random access message component 730 is used to perform.

[0181] At 915, the method may include: receiving from the second cell an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based on the random access message. The operations of 915 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 915 may be performed as described in reference to Figure 7 The activation component 735 is used to execute.

[0182] At 920, the method may include: communicating with the first cell based on the activation command and the timing advance value. The operations of 920 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 920 may be performed as described in reference Figure 7 The activated communication component 740 is executed.

[0183] Fig.10 A flowchart illustrating a method 1000 for supporting a random access message for deactivating cell timing adjustment according to one or more examples disclosed herein is shown. The operations of the method 1000 may be implemented by a UE or a component thereof as described herein. For example, the operations of the method 1000 may be implemented by a UE or a component thereof as described herein. Figures 1 to 8 The UE 115 described herein may be executed. In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the described functions.

[0184] At 1005, the method may include: receiving first control signaling from the second cell, the first control signaling indicating that the UE is to send a random access message for a timing advance detection procedure to the deactivated first cell. The operations of 1005 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1005 may be performed as described in reference to Figure 7 The control signaling component 725 is used to execute.

[0185] At 1010, the method may include: sending a random access message to the first cell based on the first control signaling. The operations of 1010 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1010 may be performed as described in reference Figure 7 The random access message component 730 is used to perform.

[0186] At 1015, the method may include: monitoring a random access response message from the first cell, the random access response message including an activation command to activate the first cell and an indication of a timing advance value generated based on the random access message. The operations of 1015 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1015 may be performed as described in reference to Figure 7 The random access response message component 745 is used to perform.

[0187] At 1020, the method may include: communicating with the first cell based on the activation command and the timing advance value. The operations of 1020 may be performed according to examples disclosed herein. In some examples, aspects of the operations of 1020 may be performed as described in reference Figure 7 The activated communication component 740 is executed.

[0188] The following provides an overview of various aspects of the disclosure:

[0189] Aspect 1: A method for performing wireless communications at a UE, the method comprising: receiving first control signaling, the first control signaling indicating that the UE is to send a random access message for a timing advance detection process to a deactivated first cell; sending the random access message to the first cell based at least in part on the first control signaling; receiving an activation command to activate the first cell and an indication of a timing advance value for the first cell generated at least in part based on the random access message from a second cell; and communicating with the first cell based at least in part on the activation command and the timing advance value.

[0190] Aspect 2: According to the method described in Aspect 1, the method further includes: receiving a second control signaling indicating multiple random access configurations, wherein the first control signaling indicates a first random access configuration among the multiple random access configurations; and communicating with the first cell according to the first random access configuration based at least in part on receiving the second control signaling.

[0191] Aspect 3: A method according to Aspect 2, wherein the multiple random access configurations indicate multiple resources for sending the random access message; the first random access configuration indicates one or more first resources among the multiple resources; and sending the random access message includes sending the random access message in the one or more first resources.

[0192] Aspect 4: According to the method described in any one of Aspects 1 to 3, the method further includes: receiving system information signaling, the system information signaling indicating a random access resource for performing a random access process associated with the first cell; and receiving the first control signaling, the first control signaling including an indication of a random access preamble code associated with the timing advance detection process; wherein sending the random access message includes sending the random access preamble code in the random access resource.

[0193] Aspect 5: According to the method described in any one of Aspects 1 to 4, the method further includes: receiving the first control signaling indicating the resources used for the timing advance detection process; wherein sending the random access message includes sending a random access preamble code in the resources used for the timing advance detection process.

[0194] Aspect 6: The method according to aspect 5, wherein the random access preamble is a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0195] Aspect 7: According to the method described in any one of Aspects 1 to 6, the method further includes: receiving the first control signaling, the first control signaling indicating that the UE is to send one or more repetitions of the random access message; and sending the one or more repetitions of the random access message.

[0196] Aspect 8: A method for performing wireless communications at a UE, the method comprising: receiving a first control signaling indicating that the UE is to send a random access message for a timing advance detection process to a deactivated first cell; sending the random access message to the first cell based at least in part on the first control signaling; monitoring a random access response message, the random access response message comprising an activation command for activating the first cell and an indication of a timing advance value generated at least in part based on the random access message; and communicating with the first cell based at least in part on the activation command and the timing advance value.

[0197] Aspect 9: According to the method described in Aspect 8, the method also includes: receiving a second control signaling indicating multiple random access configurations, wherein the first control signaling indicates a first random access configuration among the multiple random access configurations; and communicating with the first cell according to the first random access configuration based at least in part on receiving the second control signaling.

[0198] Aspect 10: A method according to Aspect 9, wherein the multiple random access configurations indicate multiple resources for sending the random access message; the first random access configuration indicates one or more first resources among the multiple resources; and sending the random access message includes sending the random access message in the one or more first resources.

[0199] Aspect 11: According to the method described in any one of Aspects 8 to 10, the method further includes: receiving system information signaling, the system information signaling indicating a random access resource associated with the first cell; and receiving the first control signaling, the first control signaling including an indication of a random access preamble code associated with the timing advance detection process; wherein sending the random access message includes sending the random access preamble code in the random access resource.

[0200] Aspect 12: According to the method described in any one of Aspects 8 to 11, the method further includes: receiving the first control signaling indicating the resources used for the timing advance detection process; wherein sending the random access message includes sending a random access preamble code in the resources used for the timing advance detection process.

[0201] Aspect 13: The method according to aspect 12, wherein the random access preamble is a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

[0202] Aspect 14: The method according to any one of aspects 8 to 13, the method further comprising: receiving the random access response message; and sending a positive acknowledgement based at least in part on receiving the random access response message.

[0203] Aspect 15: According to the method described in any one of Aspects 8 to 14, the method further includes: starting a random access response timer based at least in part on sending the random access message; failing to receive the random access response message before the expiration of the random access response timer; and sending an indication to the activated cell that the random access response message has not been received.

[0204] Aspect 16: According to the method described in any one of Aspects 8 to 15, the method further includes: starting a random access response timer based at least in part on sending the random access message; failing to receive the random access response message before the expiration of the random access response timer; and resending the random access message after a backoff delay.

[0205] Aspect 17: According to the method described in any one of Aspects 8 to 16, the method further includes: receiving the first control signaling, the first control signaling indicating that the UE is to send one or more repetitions of the random access message; and sending the one or more repetitions of the random access message.

[0206] Aspect 18: The method according to any one of aspects 8 to 17, wherein the first control signaling is received from an activated cell different from the first cell.

[0207] Aspect 19: An apparatus for performing wireless communications at a UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 1 to 7.

[0208] Aspect 20: An apparatus for wireless communication at a UE, the apparatus comprising: at least one component for performing the method according to any one of aspects 1 to 7.

[0209] Aspect 21: A non-transitory computer-readable medium storing a code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 1 to 7.

[0210] Aspect 22: An apparatus for performing wireless communications at a UE, the apparatus comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method according to any one of Aspects 8 to 18.

[0211] Aspect 23: An apparatus for wireless communication at a UE, the apparatus comprising: at least one component for performing a method according to any one of aspects 8 to 18.

[0212] Aspect 24: A non-transitory computer-readable medium storing a code for wireless communication at a UE, the code comprising instructions executable by a processor to perform the method according to any one of aspects 8 to 18.

[0213] It should be noted that the methods described herein describe possible implementations, and that the various operations and steps may be rearranged or otherwise modified and that other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0214] Although aspects of an LTE, LTE-A, LTE-A Pro, or NR system may be described for example purposes, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used in much of the description, the techniques described herein may also be applicable to networks other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0215] The information and signals described herein may be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips mentioned throughout the specification may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or optical particles, or any combination thereof.

[0216] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or executed using a general purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0217] The functions described herein may be implemented using hardware, software executed by a processor, firmware, or any combination thereof. If implemented using software executed by a processor, the functions may be stored as one or more instructions or codes of a computer-readable medium, or sent using one or more instructions or codes of a computer-readable medium. Other examples and specific implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein may be implemented using software executed by a processor, hardware, firmware, hard wiring, or a combination of any of these items. Features that implement the functions may also be physically located at different locations, including being distributed so that the various parts of the functions are implemented at different physical locations.

[0218] Computer-readable media include both non-transient computer storage media and communication media, including any media that facilitates the transfer of a computer program from one location to another. Non-transient storage media can be any available media that can be accessed by a general or special computer. By way of example and not limitation, non-transient computer-readable media may include RAM, ROM, electrically erasable programmable ROM (EEPROM), flash memory, compact disc (CD) ROM or other optical disc storage device, disk storage device or other magnetic storage device, or can be used to carry or store desired program code components in the form of instructions or data structures and any other non-transient media that can be accessed by a general or special computer or a general or special processor. In addition, any connection is appropriately referred to as a computer-readable medium. For example, if the software is sent from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technologies such as infrared, radio and microwaves, then coaxial cable, fiber optic cable, twisted pair, DSL or wireless technologies such as infrared, radio and microwaves are included in the definition of computer-readable media. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk and Blu-ray disc. Disks can reproduce data magnetically, while discs can reproduce data optically using lasers. Combinations of the above are also included within the scope of computer readable media.

[0219] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items introduced by a phrase such as "at least one of..." or "one or more of...") indicates an inclusive list, so 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). In addition, as used herein, the phrase "based on" should not be interpreted as a reference to a closed set of conditions. For example, an example step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "based at least in part on."

[0220] The term "determining" encompasses a wide variety of actions, and thus, "determining" may include calculating, computing, processing, deriving, investigating, looking up (such as via looking up in a table, database or other data structure), ascertaining, etc. Furthermore, "determining" may include receiving (e.g., receiving information), accessing (e.g., accessing data stored in a memory), etc. Furthermore, "determining" may include parsing, retrieving, selecting, choosing, establishing, and other such similar actions.

[0221] In the drawings, similar components or features may have the same reference label. In addition, components of the same type may be distinguished by following the reference label with a dash and a second label to distinguish between similar components. If only the first reference label is used in the specification, the description may apply to any of the similar components having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0222] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "advantageous over other examples." The specific embodiments include specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0223] The description herein is provided to enable one of ordinary skill in the art to implement or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but should be granted the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receiving a first control signaling from the second cell, wherein the first control signaling indicates that the UE is to send a random access message for a timing advance detection process to the deactivated first cell; sending the random access message to the first cell based at least in part on the first control signaling; receiving, from a second cell, an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based at least in part on the random access message; as well as Communicating with the first cell based at least in part on the activation command and the timing advance value.

2. The apparatus of claim 1 , wherein the instructions are further executable by the processor to cause the apparatus to: receiving a second control signaling indicating a plurality of random access configurations, wherein the first control signaling indicates a first random access configuration among the plurality of random access configurations; and Based at least in part on receiving the second control signaling, communicating with the first cell according to the first random access configuration.

3. The device according to claim 2, wherein: The multiple random access configurations indicate multiple resources used to send the random access message; The first random access configuration indicates one or more first resources among the plurality of resources; and Sending the random access message includes sending the random access message in the one or more first resources.

4. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: receiving system information signaling indicating random access resources for performing a random access procedure associated with the first cell; and receiving the first control signaling, the first control signaling comprising an indication of a random access preamble associated with the timing advance detection procedure; The sending of the random access message includes sending the random access preamble in the random access resource.

5. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: receiving the first control signaling indicating resources for the timing advance detection process; The sending of the random access message includes sending a random access preamble in the resource used for the timing advance detection process.

6. The apparatus of claim 5, wherein the random access preamble is a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

7. The apparatus of claim 1, wherein the instructions are further executable by the processor to cause the apparatus to: receiving the first control signaling, the first control signaling indicating that the UE is to send one or more repetitions of the random access message; and The one or more repetitions of the random access message are sent.

8. An apparatus for wireless communication at a user equipment (UE), the apparatus comprising: processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to: receiving a first control signaling from the second cell, wherein the first control signaling indicates that the UE is to send a random access message for a timing advance detection process to the deactivated first cell; sending the random access message to the first cell based at least in part on the first control signaling; monitoring a random access response message from the first cell, the random access response message comprising an activation command to activate the first cell and an indication of a timing advance value generated based at least in part on the random access message; and Communicating with the first cell based at least in part on the activation command and the timing advance value.

9. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: receiving a second control signaling indicating a plurality of random access configurations, wherein the first control signaling indicates a first random access configuration among the plurality of random access configurations; and Based at least in part on receiving the second control signaling, communicating with the first cell according to the first random access configuration.

10. The device according to claim 9, wherein: The multiple random access configurations indicate multiple resources used to send the random access message; The first random access configuration indicates one or more first resources among the plurality of resources; and Sending the random access message includes sending the random access message in the one or more first resources.

11. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: receiving system information signaling indicating random access resources associated with the first cell; and receiving the first control signaling, the first control signaling comprising an indication of a random access preamble associated with the timing advance detection procedure; The sending of the random access message includes sending the random access preamble in the random access resource.

12. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: receiving the first control signaling indicating resources for the timing advance detection process; The sending of the random access message includes sending a random access preamble in the resource used for the timing advance detection process.

13. The apparatus of claim 12, wherein the random access preamble is a randomly selected preamble for contention-based random access, a predefined preamble for contention-based random access, or a preamble for contention-free random access received by the UE in control signaling.

14. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: receiving the random access response message; and A positive acknowledgement is sent based at least in part on receiving the random access response message.

15. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: starting a random access response timer based at least in part on sending the random access message; The random access response message fails to be received before the random access response timer expires; and Sending an indication to the activated cell that the random access response message has not been received.

16. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: starting a random access response timer based at least in part on sending the random access message; The random access response message fails to be received before the random access response timer expires; and The random access message is resent after a backoff delay.

17. The apparatus of claim 8, wherein the instructions are further executable by the processor to cause the apparatus to: receiving the first control signaling, the first control signaling indicating that the UE is to send one or more repetitions of the random access message; and The one or more repetitions of the random access message are sent.

18. The apparatus of claim 8, wherein the first control signaling is received from an activated cell different from the first cell.

19. A method for wireless communication at a user equipment (UE), the method comprising: receiving a first control signaling from the second cell, wherein the first control signaling indicates that the UE is to send a random access message for a timing advance detection process to the deactivated first cell; sending the random access message to the first cell based at least in part on the first control signaling; receiving, from a second cell, an activation command to activate the first cell and an indication of a timing advance value for the first cell generated based at least in part on the random access message; as well as Communicating with the first cell based at least in part on the activation command and the timing advance value.

20. The method according to claim 19, further comprising: receiving a second control signaling indicating a plurality of random access configurations, wherein the first control signaling indicates a first random access configuration among the plurality of random access configurations; as well as Based at least in part on receiving the second control signaling, communicating with the first cell according to the first random access configuration.

21. The method according to claim 19, further comprising: receiving system information signaling indicating random access resources for performing a random access procedure associated with the first cell; as well as receiving the first control signaling, the first control signaling comprising an indication of a random access preamble associated with the timing advance detection procedure; The sending of the random access message includes sending the random access preamble in the random access resource.

22. The method according to claim 19, further comprising: receiving the first control signaling indicating resources for the timing advance detection process; The sending of the random access message includes sending a random access preamble in the resource used for the timing advance detection process.

23. A method for wireless communication at a user equipment (UE), the method comprising: receiving a first control signaling from the second cell, wherein the first control signaling indicates that the UE is to send a random access message for a timing advance detection process to the deactivated first cell; sending the random access message to the first cell based at least in part on the first control signaling; monitoring a random access response message from the first cell, the random access response message comprising an activation command to activate the first cell and an indication of a timing advance value generated based at least in part on the random access message; and Communicating with the first cell based at least in part on the activation command and the timing advance value.

24. The method according to claim 23, further comprising: receiving a second control signaling indicating a plurality of random access configurations, wherein the first control signaling indicates a first random access configuration among the plurality of random access configurations; as well as Based at least in part on receiving the second control signaling, communicating with the first cell according to the first random access configuration.

25. The method according to claim 23, further comprising: receiving system information signaling, the system information signaling indicating random access resources associated with the first cell; as well as receiving the first control signaling, the first control signaling comprising an indication of a random access preamble associated with the timing advance detection procedure; The sending of the random access message includes sending the random access preamble in the random access resource.

26. The method according to claim 23, further comprising: receiving the first control signaling indicating resources for the timing advance detection process; The sending of the random access message includes sending a random access preamble in the resource used for the timing advance detection process.

27. The method according to claim 23, further comprising: receiving the random access response message; as well as A positive acknowledgement is sent based at least in part on receiving the random access response message.

28. The method according to claim 23, further comprising: starting a random access response timer based at least in part on sending the random access message; Before the random access response timer expires, the random access response message fails to be received; as well as Sending an indication to the activated cell that the random access response message has not been received.

29. The method of claim 23, further comprising: starting a random access response timer based at least in part on sending the random access message; Before the random access response timer expires, the random access response message fails to be received; as well as The random access message is resent after a backoff delay.

30. The method of claim 23, wherein the first control signaling is received from an activated cell different from the first cell.

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