Signaling in asynchronous carrier aggregation

Abstract

Methods, systems, and apparatus for wireless communications are described. A user equipment (UE) may identify misalignments between system frame numbers (SFNs) associated with multiple serving cells in an asynchronous carrier aggregation configuration. The UE may select a SFN to use as an input for calculating transmission parameters associated with communicating with one or more serving cells. Additionally, the serving cells may identify which SFN the UE selects in order to efficiently communicate with the UE. In some examples, the UE may receive an explicit indication of which SFN to use and select the SFN accordingly. In other examples, the UE may select which SFN to use based on one or more parameters associated with the serving cells in the asynchronous carrier aggregation configuration.

Description

[0001] Cross-references

[0002] This patent application claims the benefit of PCT Application No. PCT / CN2019 / 116146, entitled “SIGNALING INASYNCHRONOUS CARRIER AGGREGATION,” filed by Cheng et al. on November 7, 2019, which is assigned to the assignee of this application. Technical Field

[0003] The following relates generally to wireless communications, and more particularly to signaling in asynchronous carrier aggregation.

[0004] background

[0005] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasting, 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 use various technologies, such as code division multiple access (CDMA), time division multiple access (TDMA), frequency division multiple access (FDMA), orthogonal frequency division multiple access (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 or one or more network access nodes, each base station or network access node simultaneously supporting communication with multiple communication devices, which may be referred to as user equipment (UE) in addition.

[0006] In some examples, a UE may communicate with multiple serving cells of a wireless communication system in a carrier aggregation (CA) configuration. In some instances, the communications with the multiple serving cells may be asynchronous, wherein frame boundaries of the communications with the multiple serving cells may be misaligned. Such misalignment may make it difficult for the UE to communicate with the multiple serving cells concurrently.

[0007] Overview

[0008] The described techniques relate to improved methods, systems, devices, and apparatuses for supporting signaling in asynchronous carrier aggregation. In general, the described techniques are provided for enabling a user equipment (UE) to identify misalignments between system frame numbers (SFNs) associated with multiple serving cells in an asynchronous carrier aggregation configuration. Due to the misalignment, there may be ambiguity as to which of these SFNs the UE should use as input when calculating various transmission parameters. Therefore, the described techniques provide a potential method for the UE to select an SFN for use as input for calculating transmission parameters associated with communicating with one or more of these serving cells. Additionally or alternatively, these serving cells may identify which SFN the UE selects in order to communicate efficiently with the UE. In some examples, the UE may receive a display indication of which SFN to use and select the SFN accordingly. In other examples, the UE may select which SFN to use based on one or more parameters associated with these serving cells in the asynchronous carrier aggregation configuration.

[0009] A method of wireless communication at a UE is described. The method may include: identifying that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with the second serving cell; selecting a system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculating a transmission parameter based on the selected system frame number; and communicating with at least one of the first serving cell and the second serving cell based on the calculated transmission parameter.

[0010] 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 executable by the processor to cause the apparatus to: identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with the second serving cell; select a system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculate a transmission parameter based on the selected system frame number; and communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameter.

[0011] Another apparatus for wireless communication at a UE is described. The apparatus may include means for: identifying that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with the second serving cell; selecting a system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculating a transmission parameter based on the selected system frame number; and communicating with at least one of the first serving cell and the second serving cell based on the calculated transmission parameter.

[0012] A non-transitory computer-readable medium storing code for wireless communication at a UE is described. The code may include instructions executable by a processor for the following operations: identifying that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with the second serving cell; selecting a system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculating a transmission parameter based on the selected system frame number; and communicating with at least one of the first serving cell and the second serving cell based on the calculated transmission parameter.

[0013] In some examples of the methods, devices, and non-transitory computer-readable media described herein, selecting a system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for the following actions: identifying that one of a first serving cell and a second serving cell may be a configured serving cell configured for at least one of semi-persistent scheduled communications or configured granted communications; and selecting the first system frame number or the second system frame number based on one of the first serving cell and the second serving cell being a configured serving cell.

[0014] In some examples of the methods, devices, and non-transitory computer-readable media described herein, selecting a system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for the following actions: identifying that one of a first service cell and a second service cell can be a current service cell; and selecting a first system frame number or a second system frame number based on that one of the first service cell and the second service cell is the current service cell.

[0015] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, selecting a system frame number for transmission parameter calculation input may include operations, features, apparatus, or instructions for the following actions: identifying that one of the first service cell and the second service cell can operate in frequency range 2 and can have the smallest service cell index among the first service cell and the second service cell operating in frequency range 2; and selecting the first system frame number or the second system frame number based on one of the first service cell and the second service cell having the smallest service cell index among the service cells operating in frequency range 2.

[0016] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating a measurement gap for a serving cell operating in frequency range 2 based on a selected system frame number.

[0017] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating measurement gaps for serving cells in a master cell group (MCG) and a secondary cell group (SCG) based on a selected system frame number.

[0018] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, selecting a system frame number for transmission parameter calculation input may include operations, features, apparatus, or instructions for the following actions: identifying that one of a first service cell and a second service cell can operate in frequency range 2 and can have a maximum service cell index among the first service cell and the second service cell operating in frequency range 2; and selecting the first system frame number or the second system frame number based on one of the first service cell and the second service cell having the maximum service cell index among the service cells operating in frequency range 2.

[0019] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating a measurement gap for a serving cell operating in frequency range 2 based on a selected system frame number.

[0020] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating the measurement gap for the serving cellular cells in the MCG and SCG based on the selected system frame number.

[0021] In some examples of the methods, devices, and non-transitory computer-readable media described herein, selecting a system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for the following actions: identifying that a first service cell and a second service cell may be part of the same cell group; identifying a primary cell within the same cell group; and selecting a first system frame number or a second system frame number based on one of the first service cell and the second service cell being the primary cell.

[0022] In some examples of the methods, devices (apparatuses), and non-transitory computer-readable media described herein, the primary cell in the same cell group may be a primary cell (PCell) of an MCG.

[0023] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the primary cell in the same cell group may be a primary secondary cell (PSCell) of the SCG.

[0024] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, selecting a system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for the following actions: receiving an indication that one of a first service cell or a second service cell may be associated with a selected system frame number; and selecting the first system frame number or the second system frame number based on the indication.

[0025] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the indication includes a cell index.

[0026] In some examples of the methods, devices, and non-transitory computer-readable media described herein, receiving the indication may include operations, features, means, or instructions for receiving the indication via a radio resource control message.

[0027] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include a hybrid automatic repeat request (HARQ) process identifier for semi-persistent scheduling or configured grant operation.

[0028] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include a time slot associated with a downlink assignment occurrence in a semi-persistent scheduling operation.

[0029] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include one or more symbols associated with an uplink grant occurrence in a configured grant operation.

[0030] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameter includes a starting point for an on duration in a discontinuous reception cycle.

[0031] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include measurement gap timing for serving cell operation in frequency range 2.

[0032] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a first serving cell may be associated with a first radio access technology (RAT) and a second serving cell may be associated with a second RAT.

[0033] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the first RAT may be different from the second RAT.

[0034] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: identifying that the UE may be further configured to communicate with one or more additional service cells, wherein there is a second misalignment between the first system frame number, the second system frame number, and an additional system frame number associated with the one or more additional service cells, updating the selected system frame number based on the second misalignment, wherein the updated system frame number includes the first system frame number, the second system frame number, or one of the additional system frame numbers; and calculating the transmission parameter based on the updated system frame number.

[0035] A method of wireless communication at a first serving cell is described. The method may include: determining a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a UE via asynchronous carrier aggregation; identifying a selected system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculating a transmission parameter based on the selected system frame number; and communicating with the UE based on the calculated transmission parameter.

[0036] An apparatus for wireless communication at a first serving cell is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: determine a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a UE via asynchronous carrier aggregation; identify a selected system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculate transmission parameters based on the selected system frame number; and communicate with the UE based on the calculated transmission parameters.

[0037] An apparatus for wireless communication at a first serving cell is described. The apparatus may include means for determining a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a UE via asynchronous carrier aggregation; identifying a selected system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculating transmission parameters based on the selected system frame number; and communicating with the UE based on the calculated transmission parameters.

[0038] A non-transitory computer-readable medium storing code for wireless communication at a first serving cell is described. The code may include instructions executable by a processor for: determining a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a UE via asynchronous carrier aggregation; identifying a selected system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based on the presence of the misalignment; calculating transmission parameters based on the selected system frame number; and communicating with the UE based on the calculated transmission parameters.

[0039] In some examples of the methods, devices, and non-transitory computer-readable media described herein, identifying a selected system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for the following actions: identifying that one of a first serving cell and a second serving cell may be a configured serving cell configured for at least one of semi-persistent scheduled communications or configured granted communications; and identifying the first system frame number or the second system frame number as the selected system frame number based on one of the first serving cell and the second serving cell being a configured serving cell.

[0040] In some examples of the methods, devices, and non-transitory computer-readable media described herein, identifying a selected system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for the following actions: identifying that one of a first service cell and a second service cell may be a current service cell; and identifying the first system frame number or the second system frame number as the selected system frame number based on one of the first service cell and the second service cell being the current service cell.

[0041] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying a selected system frame number for transmission parameter calculation input may include operations, features, apparatus, or instructions for the following actions: identifying that one of a first service cell and a second service cell can operate in frequency range 2 and can have a minimum service cell index among service cells operating in frequency range 2; and identifying the first system frame number or the second system frame number as the selected system frame number based on one of the first service cell and the second service cell having the minimum service cell index among service cells operating in frequency range 2.

[0042] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating a measurement gap for a serving cell operating in frequency range 2 based on a selected system frame number.

[0043] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating the measurement gap for the serving cellular cells in the MCG and SCG based on the selected system frame number.

[0044] In some examples of the methods, apparatuses, and non-transitory computer-readable media described herein, identifying a selected system frame number for transmission parameter calculation input may include operations, features, apparatus, or instructions for the following actions: identifying that one of a first service cell and a second service cell can operate in frequency range 2 and can have a maximum service cell index among service cells operating in frequency range 2; and identifying the first system frame number or the second system frame number as the selected system frame number based on one of the first service cell and the second service cell having the maximum service cell index among service cells operating in frequency range 2.

[0045] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating a measurement gap for a serving cell operating in frequency range 2 based on a selected system frame number.

[0046] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, calculating the transmission parameter may include operations, features, apparatus, or instructions for the following actions: calculating the measurement gap for the serving cellular cells in the MCG and SCG based on the selected system frame number.

[0047] In some examples of the methods, devices, and non-transitory computer-readable media described herein, identifying a selected system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for the following actions: identifying that a first service cell and a second service cell may be part of the same cell group; identifying a primary cell within the same cell group; and identifying the first system frame number or the second system frame number as the selected system frame number based on one of the first service cell and the second service cell being the primary cell.

[0048] In some examples of the methods, devices (apparatuses), and non-transitory computer-readable media described herein, the primary cell in the same cell group may be a PCell of an MCG.

[0049] In some examples of the methods, devices (apparatuses), and non-transitory computer-readable media described herein, the primary cell in the same cell group may be a PSCell of an SCG.

[0050] In some examples of the methods, apparatus (devices), and non-transitory computer-readable media described herein, identifying a selected system frame number for transmission parameter calculation input may include operations, features, devices, or instructions for: transmitting an indication that one of a first service cell or a second service cell may be associated with the selected system frame number; and identifying the first system frame number or the second system frame number as the selected system frame number based on the transmitted indication.

[0051] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the indication includes a cell index.

[0052] In some examples of the methods, devices, and non-transitory computer-readable media described herein, transmitting the indication may include operations, features, means, or instructions for transmitting the indication via a radio resource control message.

[0053] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include a HARQ process identifier for semi-persistent scheduling or configured grant operation.

[0054] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include a time slot associated with a downlink assignment occurrence in a semi-persistent scheduling operation.

[0055] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include one or more symbols associated with an uplink grant occurrence in a configured grant operation.

[0056] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameter includes a starting point for an on duration in a discontinuous reception cycle.

[0057] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the transmission parameters include measurement gap timing for serving cell operation in frequency range 2.

[0058] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, a first serving cell may be associated with a first RAT and a second serving cell may be associated with a second RAT.

[0059] In some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein, the first RAT may be different from the second RAT.

[0060] Some examples of the methods, devices (apparatus), and non-transitory computer-readable media described herein may further include operations, features, apparatus, or instructions for the following actions: identifying that the UE may be further configured to communicate with one or more additional service cells, wherein there is a second misalignment between the first system frame number, the second system frame number, and an additional system frame number associated with the one or more additional service cells; updating the selected system frame number based on the second misalignment, wherein the updated system frame number includes the first system frame number, the second system frame number, or one of the additional system frame numbers; and calculating the transmission parameter based on the updated system frame number. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 and 2

[0013] An example of a wireless communication system supporting signaling in asynchronous carrier aggregation in accordance with aspects of the present disclosure is illustrated.

[0063] Figure 3 An example of a timing diagram supporting signaling in asynchronous carrier aggregation is illustrated in accordance with aspects of the present disclosure.

[0064] Figure 4 An example of a process flow to support signaling in asynchronous carrier aggregation according to aspects of the present disclosure is illustrated.

[0065] Figure 5 and 6 A block diagram of an apparatus supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown.

[0066] Figure 7 A block diagram of a communications manager supporting signaling in asynchronous carrier aggregation is shown in accordance with aspects of the present disclosure.

[0067] Figure 8 A diagram of a system including devices supporting signaling in asynchronous carrier aggregation is shown in accordance with aspects of the present disclosure.

[0068] Fig. 9 and 10 A block diagram of an apparatus supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown.

[0069] Fig.11 A block diagram of a communications manager supporting signaling in asynchronous carrier aggregation is shown in accordance with aspects of the present disclosure.

[0070] Fig.12 A diagram of a system including devices supporting signaling in asynchronous carrier aggregation is shown in accordance with aspects of the present disclosure.

[0071] Figures 13 to 18 A flow chart illustrating a method of supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown.

[0072] Detailed Description

[0073] A user equipment (UE) in a wireless communication system may communicate with multiple serving cells (e.g., associated with one or more base stations) in a carrier aggregation (CA) configuration to increase the available bandwidth and data rate of the UE. Each serving cell may communicate with the UE on a corresponding component carrier (CC) in a corresponding frequency band. Each serving cell may be associated with a radio access technology (RAT) (e.g., a fourth generation (4G) system (such as a long term evolution (LTE) system), a fifth generation (5G) system (which may be referred to as a new radio (NR) system), etc.). For example, a UE may communicate with two serving cells in a dual connectivity scheme, where each serving cell may belong to a different RAT or a different cell group within a RAT.

[0074] In some examples, each serving cell in communication with the UE may have a different starting point for communications on the corresponding CC. As a result, the frame boundaries of the communications may be misaligned in time (i.e., asynchronous). For example, a first serving cell may be associated with a first system frame number (SFN), while a second serving cell may be associated with a second SFN that is different from the first SFN. Several transmission parameters at the UE may be calculated using the SFN as input, and it may be difficult to communicate concurrently with serving cells associated with different SFNs in a CA configuration. Additionally, using different aligned SFNs, there may be ambiguity as to which SFN the UE should use when determining various transmission parameters.

[0075] According to the techniques described herein, a UE may identify misalignments between SFNs associated with a plurality of serving cells and subsequently select a SFN to use as an input for calculating transmission parameters. Additionally, the serving cells may identify which SFN the UE selects for efficient communication with the UE. In some examples, the transmission parameters may include a hybrid automatic repeat request (HARQ) process identifier (ID), a time slot in which a downlink assignment occurs, a symbol in which an uplink grant occurs, a starting point for a start duration of a discontinuous reception (DRX) cycle, a measurement gap timing for communication in a frequency range (e.g., frequency range 2 (FR2)), or a combination thereof.

[0076] The UE may select the SFN to use as input for the calculation based on one or more factors. In some examples, the UE may receive an explicit indication from the network identifying the SFN to be used by the UE. The UE may receive the indication as a serving cell index associated with the serving cell, for example, in a radio resource control (RRC) message. In some examples, the UE may communicate with the serving cell based on semi-persistent scheduling, configured grant, or a combination thereof. The UE may select an SFN associated with a serving cell configured for semi-persistent scheduling or configured grant operation. In some examples, the UE may identify a current serving cell in a CA configuration, where the current serving cell may be a serving cell with which the UE has most recently communicated. The UE may select an SFN associated with the current serving cell. In some examples, the UE may identify that each serving cell in the CA configuration is included in a common cell group. The UE may select a SFN associated with a primary cell of a common cell group, where the primary cell may be a primary cell (PCell) in a master cell group (MCG) or a primary secondary cell (PSCell) in a secondary cell group (SCG).

[0077] In some examples, the UE may identify that one or more serving cells in the CA configuration are operating in FR2, which may correspond to a millimeter wave (mmW) frequency range. In one example, the UE may select a SFN associated with a serving cell having a maximum serving cell index among the serving cells operating in FR2. In another example, the UE may select a SFN associated with a serving cell having a minimum serving cell index among the serving cells operating in FR2.

[0078] Various aspects of the present disclosure are initially described in the context of wireless communication systems. Example timing diagrams and example process flows that illustrate various aspects of the discussed techniques are then described. Various aspects of the present disclosure are further illustrated and described by and with reference to apparatus diagrams, system diagrams, and flow diagrams related to signaling in asynchronous carrier aggregation.

[0079] Figure 1 An example of a wireless communication system 100 supporting signaling in asynchronous carrier aggregation according to various aspects of the present disclosure is illustrated. The wireless communication system 100 may include one or more base stations 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-APro network, or a new radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0080] The base stations 105 may be dispersed throughout a geographic area to form the wireless communication system 100, and may be different forms of devices or devices with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals according to one or more radio access technologies.

[0081] 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 stationary and mobile at different times. The UEs 115 may be different forms of devices or devices with different capabilities. Figure 1Some example UEs 115 are illustrated in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment), such as Figure 1 as shown in .

[0082] Each base station 105 may communicate with the core network 130 or with each other or both. For example, the base station 105 may interface with the core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). The base stations 105 may communicate with each other directly (e.g., directly between the base stations 105) or indirectly (e.g., via the core network 130), or directly and indirectly on the backhaul link 120 (e.g., via X2, Xn, or other interfaces). In some examples, the backhaul link 120 may be or include one or more wireless links.

[0083] One or more of the base stations 105 described herein may include or may be referred to by a person of ordinary skill in the art as a base transceiver station, a radio base station, an access point, a radio transceiver, a B node, an evolved B node (eNB), a next generation B node or a gigabit B node (any of which may be referred to as a gNB), a home B node, a home evolved B node, or other suitable terminology.

[0084] 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 a "device" may also be referred to as a unit, a station, a terminal, or a client, etc. 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 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 electrical appliances or vehicles, meters, etc.

[0085] 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 base stations 105 and network equipment including macro eNBs or gNBs, small cell eNBs or gNBs, relay base stations, etc. Figure 1 as shown in .

[0086] The UE 115 and the base station 105 may communicate wirelessly with each other via one or more communication links 125 on one or more carriers. The term "carrier" may refer to a set of radio frequency spectrum resources having a defined physical layer structure for supporting the communication link 125. For example, a carrier for the communication link 125 may include a portion of a radio frequency 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 communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured to have multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used in conjunction with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0087] In some examples (e.g., 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 Radio Frequency Channel Number (EARFCN)) and may be located according to a channel grid for discovery by UE 115. A carrier may operate in a standalone mode in which 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 a connection is anchored using a different carrier (e.g., a different carrier of the same or different radio access technology).

[0088] The communication link 125 shown in the wireless communication system 100 may include an uplink transmission from the UE 115 to the base station 105, or a downlink transmission from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in an FDD mode), or may be configured to carry both downlink and uplink communications (e.g., in a TDD mode).

[0089] A carrier may be associated with a particular bandwidth of a radio frequency 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 several determined bandwidths (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 megahertz (MHz)) of a carrier of a particular radio access technology. Devices (e.g., base stations 105, UEs 115, or both) of the wireless communication system 100 may have a hardware configuration that supports communications on a particular carrier bandwidth, or may be configurable to support communications on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous communications via carriers associated with multiple carrier bandwidths. In some examples, each served UE 115 may be configured to operate on a portion (e.g., subband, BWP) or all of a carrier bandwidth.

[0090] The signal waveform transmitted on 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 include a code element period (e.g., the duration of a modulation code element) and a subcarrier, where the code element period and the subcarrier spacing are 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). Thus, the more resource elements received by UE 115 and the higher the order of the modulation scheme, the higher the data rate of UE 115 can be. Wireless communication resources may refer to a combination of radio frequency spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further improve the data rate or data integrity of communication with UE 115.

[0091] One or more parameter sets for a carrier may be supported, where the parameter set may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs with the same or different parameter designs. 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 for a UE 115 may be limited to the one or more active BWPs.

[0092] The time interval of the base station 105 or the UE 115 can be expressed as a multiple of a basic time unit, and the basic time unit can be, for example, a sampling period T s =1 / (Δf max ·N f ) seconds, where Δf max It can represent the maximum supported subcarrier spacing, and N fThe maximum 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., ranging from 0 to 1023).

[0093] 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 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 number of code element periods (e.g., depending on the length of the cyclic prefix added before each code element period). In some wireless communication systems 100, a time slot may be further divided into a plurality of mini-time slots containing one or more code elements. Excluding the cyclic prefix, each code element period may contain one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the operating band.

[0094] A subframe, slot, mini-slot, or 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 bursts of shortened TTIs (sTTIs)).

[0095] Physical channels may be multiplexed on a carrier according to various techniques. Physical control channels and physical data channels may be multiplexed on a downlink carrier, 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. A control region (e.g., a control resource set (CORESET)) for a physical control channel may be defined by a number 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 a 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. An aggregation level for a control channel candidate may refer to the number 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 .

[0096] Each base station 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 a base station 105 (e.g., on a carrier), and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) used to distinguish adjacent cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion of a geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The range of such a cell may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area depending on various factors (such as the capabilities of the base station 105). For example, a cell may be or include a building, a subset of a building, or an external space between or overlapping a geographic coverage area 110, as well as other examples.

[0097] 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 base station 105 (compared to a macro cell), and the small cell may operate in 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 base station 105 may support one or more cells and may also support communications on one or more cells using one or more component carriers.

[0098] 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 to different types of devices.

[0099] In some examples, base stations 105 may be mobile and thus provide communication coverage for mobile geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include, for example, a heterogeneous network in which different types of base stations 105 provide coverage for various geographic coverage areas 110 using the same or different radio access technologies.

[0100] The wireless communication system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing, and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing, and transmissions from different base stations 105 may not be aligned in time in some examples. The techniques described herein may be used for synchronous or asynchronous operation.

[0101] 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) or mission-critical communication. UE 115 may be designed to support ultra-reliable, low latency or critical functions (e.g., mission-critical functions). Ultra-reliable communication may include private communication or group communication, and may be supported by one or more mission-critical services (such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include prioritization of services, and mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, critical mission, and ultra-reliable low latency may be used interchangeably herein.

[0102] In some examples, UE 115 may also be able to communicate directly with other UE 115 over a device-to-device (D2D) communication link 135 (e.g., using a peer-to-peer (P2P) or D2D protocol). One or more UEs 115 utilizing D2D communication may be within a geographic coverage area 110 of a base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105, or may not be able to receive transmissions from the base station 105 for other reasons. In some examples, each group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system, wherein each UE 115 transmits to each other UE 115 in the group. In some examples, the base station 105 facilitates the scheduling of resources for D2D communication. In other cases, D2D communication is performed between each UE 115 without involving the base station 105.

[0103] 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), and the EPC or 5GC 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 UE 115 served by a base station 105 associated with the core network 130. User IP packets may be delivered via a user plane entity, which may provide IP address allocation and other functions. The user plane entity may be connected to a network operator IP service 150. Operator IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0104] Some network devices (such as base stations 105) may include subcomponents, such as access network entities 140, which may be examples of access node controllers (ANCs). Each access network entity 140 may communicate with each UE 115 through one or more other access network transport entities 145, which may be referred to as radio heads, smart radio heads, or transmission / reception points (TRPs). Each access network transport entity 145 may include one or more antenna panels. In some configurations, the various functions of each access network entity 140 or base station 105 may be distributed across various network devices (e.g., radio heads and ANCs) or merged into a single network device (e.g., base station 105).

[0105] The wireless communication system 100 may operate using one or more frequency bands, typically in the range of 300 megahertz (MHz) to 300 gigahertz (GHz). In general, the 300 MHz to 3 GHz region is referred to as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range from about 1 decimeter to 1 meter long. UHF waves may be blocked or redirected by buildings and environmental features, but these waves may penetrate various structures sufficiently for macro cells to provide service to UEs 115 located indoors. Transmissions using UHF waves may be associated with smaller antennas and shorter ranges (e.g., less than 100 kilometers) than transmissions using smaller frequencies and longer waves in the high frequency (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0106] The wireless communication system 100 may also operate in a super high frequency (SHF) zone using a frequency band from 3 GHz to 30 GHz (also known as a centimeter band) or in an extremely high frequency (EHF) zone of a spectrum (e.g., from 30 GHz to 300 GHz) (also known as a millimeter band). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between UE 115 and base station 105, and the EHF antenna of the corresponding device may be smaller and more closely spaced than the UHF antenna. In some examples, this may facilitate the use of antenna arrays within the device. However, the propagation of EHF transmissions may be subject to even greater atmospheric attenuation and a shorter range than SHF or UHF transmissions. The technology disclosed herein may be adopted across transmissions using one or more different frequency zones, and the use of frequency bands specified across these frequency zones may vary by country or regulatory agency.

[0107] The wireless communication system 100 may utilize both licensed and unlicensed radio frequency spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band (such as the 5 GHz Industrial, Scientific, and Medical (ISM) band). When operating in an unlicensed radio frequency spectrum band, devices (such as base stations 105 and UEs 115) may employ carrier sensing for conflict detection and avoidance. In some examples, operations in an unlicensed band may be based on a carrier aggregation configuration (e.g., LAA) in coordination with component carriers operating in a licensed band. Operations in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among others.

[0108] The base station 105 or UE 115 may be equipped with multiple antennas, which can be used to employ technologies such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that can 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, the antennas or antenna arrays associated with the base station 105 may be located at different geographical locations. The base station 105 may have an antenna array having antenna ports of several rows and columns that the base station 105 can use to support beamforming for communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, the antenna panel may support radio frequency beamforming for signals transmitted via the antenna ports.

[0109] The base station 105 or UE 115 can use MIMO communication to utilize multipath signal propagation and improve spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such technology may be referred to as spatial multiplexing. For example, the transmitting device may transmit multiple signals via different antennas or different antenna combinations. Similarly, the receiving device may receive multiple signals via different antennas or different antenna combinations. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits 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 technology includes single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0110] 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 base station 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 at 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 antenna element 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).

[0111] 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 of the bearer or packet data convergence protocol (PDCP) layer may be IP-based. The radio link control (RLC) layer may perform packet segmentation and reassembly to communicate on a logical channel. The media access control (MAC) layer may perform priority handling and multiplex logical channels into transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmission of the MAC layer to improve link efficiency. In the control plane, the radio resource control (RRC) protocol layer may provide the establishment, configuration, and maintenance of an RRC connection that supports radio bearers of user plane data between UE 115 and base station 105 or core network 130. At the physical layer, transport channels may be mapped to physical channels.

[0112] UE 115 and base station 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 that data is correctly received on communication link 125. HARQ may include a combination of error detection (e.g., using cyclic redundancy check (CRC)), forward error correction (FEC), and retransmission (e.g., automatic repeat request (ARQ)). HARQ may improve the throughput of the MAC layer in poor radio conditions (e.g., low signal-to-noise ratio conditions). In some examples, a device may support simultaneous slot HARQ feedback, wherein the device may provide HARQ feedback in a specific time slot for data received in a previous symbol in the time slot. In other cases, the device may provide HARQ feedback in a subsequent time slot or according to some other time interval.

[0113] The UE 115 may communicate with one or more serving cells (e.g., one or more base stations 105) in an asynchronous CA configuration. The UE 115 may identify misalignment between SFNs associated with the serving cells. The UE 115 may select an SFN to use as an input for calculating transmission parameters associated with communicating with the one or more serving cells. In some examples, the transmission parameters may include a HARQ process ID, a time slot in which a downlink assignment occurs, a symbol in which an uplink grant occurs, a starting point for the on duration of a DRX cycle, a measurement gap timing for communication in a frequency range (e.g., FR2), or a combination thereof. Additionally, the serving cells may identify which SFN the UE 115 selects in order to efficiently communicate with the UE.

[0114] The UE 115 may select which SFN to use as input based on one or more factors. In some examples, the base station 105 may explicitly indicate in the RRC message which SFN the UE 115 is to use, for example, by including an associated serving cell index in one or both of the CellGroupConfig or mac-CellGroupConfig fields in the RRC message. In some examples, the UE 115 may select an SFN associated with a base station 105 configured for semi-persistent scheduling or configured to grant operation. In some examples, the UE 115 may select an SFN associated with the current base station 105. In some examples, the UE 115 may identify that the base station 105 is in a cell group. The UE 115 may select an SFN associated with a primary cell of the cell group, which may be a PCell of an MCG or a PSCell of an SCG. In some examples, the UE 115 may identify that the base station 105 is operating in FR2. UE 115 may select a SFN associated with a base station 105 having a maximum serving cell index or a minimum serving cell index among base stations 105. SFN selection techniques performed by UE 115 may support improvements to UE 115 communication operations and, in some examples, may result in improvements to UE 115 reliability, among other benefits.

[0115] Figure 2 An example of a wireless communication system 200 that supports signaling in asynchronous carrier aggregation according to aspects of the present disclosure is illustrated. In some examples, the wireless communication system 200 can implement aspects of the wireless communication system 100. For example, the wireless communication system 200 can include a base station 205 and a UE 215, which can be referenced Figure 1 Examples of corresponding devices described. The wireless communication system 200 may include features for improved signaling in asynchronous CA configurations, among other benefits.

[0116] In wireless communication system 200, base station 205 may serve as a serving cell for geographic coverage area 210. Base station 205 may configure and transmit downlink transmissions 220 to UE 215, and receive uplink transmissions 225 from UE 215. Figure 2, UE 215 may communicate concurrently with base station 205-a and base station 205-b, for example, in a CA configuration. In some examples, each base station 205 in communication with UE 215 may have a different starting point for communication on a corresponding CC. As a result, the CA configuration may be asynchronous. For example, base station 205-a may be associated with an SFN, while base station 205-a may be associated with a second SFN that is different from the first SFN. Several transmission parameters at UE 215 may be calculated using an SFN as input, and thus a misaligned SFN may make it difficult for UE 215 to communicate concurrently with base station 205-a and base station 205-b in a CA configuration.

[0117] UE 215 may select an SFN to be used as an input for calculating one or more transmission parameters. In some examples, UE 215 may receive an indication from base station 205-a or base station 205-b identifying which SFN UE 215 is to use. For example, base station 205 may transmit the indication in an RRC message. In some examples, UE 215 may select an SFN associated with a base station 205 configured for semi-persistent scheduling or configured to grant operation. In some examples, UE 215 may select an SFN associated with the current base station 205. In some examples, UE 215 may identify that base station 205 is in a cell group. UE 215 may select an SFN associated with a primary cell of the cell group, where the primary cell may be a PCell of an MCG or a PSCell of an SCG. In some examples, UE 215 may identify that base station 205 is operating in FR2. The UE 215 may select a SFN associated with a base station 205 having a maximum serving cell index or a minimum serving cell index among the base stations 205 operating in FR2.

[0118] Figure 3 An example of a timing diagram 300 that supports signaling in asynchronous carrier aggregation according to aspects of the present disclosure is illustrated. In some examples, the timing diagram 300 can implement aspects of wireless communication systems 100 and 200. The timing diagram 300 can be associated with communications between a base station 305 and a UE, which can be a reference Figure 1 and 2 Examples of corresponding devices described.

[0119] Base station 305-a and base station 305-b may communicate concurrently with the UE, for example, in a CA configuration. Base station 305-a may exchange transmissions with the UE in frame 315, and base station 305-b may exchange transmissions with the UE in frame 320. In some examples, the UE may communicate with one or more base stations 305 based on semi-persistent scheduling, configured grants, or a combination thereof. Each base station 305 may have an associated starting point 310 for communication with the UE. For example, the starting point 310-a for base station 305-a may be associated with the beginning of a first frame 315-a for communication with the UE, and the starting point 310-b for base station 305-b may be associated with the beginning of a first frame 320-a for communication with the UE. Frame 315-a may be associated with a first SFN, and frame 320-a may be associated with a second SFN.

[0120] like Figure 3 As illustrated in FIG. 1 , starting point 310 - a and starting point 310 - b may be misaligned in time, separated by misalignment 325 . In some examples, misalignment 325 may be below a threshold, which may correspond to a number of sampling periods T . S (For example, 76800 T S ). As a result of the misalignment 325, the first SFN may be different from the second SFN. The misalignment 325 may be a duration such that the time slots within the frame 315 may be aligned with the time slots within the frame 320. That is, although the boundaries of the frame 315 may be misaligned with the boundaries of the frame 320, the boundaries of the time slots within the frame 315 and the frame 320 may remain aligned.

[0121] Based on the misalignment 325, the UE may select a SFN (e.g., a first SFN or a second SFN) to use as an input for calculating one or more transmission parameters. In some examples, the transmission parameters may include a HARQ process ID, a time slot in which a downlink assignment occurs, a symbol in which an uplink grant occurs, a starting point for an on duration of a DRX cycle, a measurement gap timing for communications in a frequency range (e.g., FR2), or a combination thereof.

[0122] The UE may select which SFN to use as input based on one or more factors. In some examples, the base station 305 may explicitly indicate in the RRC message which SFN the UE is to use, for example by including an associated serving cell index in one or both of the CellGroupConfig or mac-CellGroupConfig fields in the RRC message. In some examples, the UE may select an SFN associated with a base station 305 configured for semi-persistent scheduling or configured to grant operation. In some examples, the UE may select an SFN associated with the current base station 305. In some examples, the UE may identify that the base station 305 is in a cell group. The UE may select an SFN associated with the primary cell of the cell group, where the primary cell may be a PCell of an MCG or a PSCell of an SCG. In some examples, the UE may identify that the base station 305 is operating in FR2. The UE may select an SFN associated with a base station 305 having the largest serving cell index or the smallest serving cell index among the base stations 305.

[0123] In some examples, in addition to using the selected SFN as an input, the UE may also calculate the transmission parameters based on the number of consecutive time slots (e.g., 10, 20, etc.) configured in a frame (e.g., within frame 315 or frame 320), which may be represented by the input parameter numberOfSlotsPerFrame. Additionally or alternatively, the UE may calculate the transmission parameters based on the number of symbols configured in a time slot, which may be represented by the input parameter numberOfSymbolsPerSlot.

[0124] In semi-persistent scheduling or configured grant operation, the UE may calculate the HARQ process ID based on the formula [floor(current_slot×10 / (numberOfSlotsPerFrame×periodicity))], where current_slot=[(SFN×numberOfSlotsPerFrame)+number of slots in the frame]. The UE may calculate the current_slot parameter using the selected SFN (e.g., the first SFN or the second SFN) as input.

[0125] In semi-persistent scheduling operation, a given downlink assignment (which may be referred to as the Nth downlink assignment) may occur in a time slot that satisfies the following equation: (numberOfSlotsPerFrame×SFN+number of slots in the frame)=[(numberOfSlotsPerFrame×SFN 起始时间 +Time Slot 起始时间)+N×periodicity×numberOfSlotsPerFrame / 10]mod(1024×numberOfSlotsPerFrame), where SFN 起始时间 and time slot 起始时间 The SFN and the timeslot respectively represent the SFN and the timeslot corresponding to the first transmission of the physical downlink shared channel (PDSCH) in which the downlink assignment is initialized (or reinitialized). The UE can use the selected SFN (e.g., the first SFN or the second SFN) as input to calculate the parameter numberOfSlotsPerFrame×SFN+the number of timeslots in the frame.

[0126] For the first type of configured grant operation (which may be referred to as configured grant type 1), the MAC entity may consider the uplink grant to recur in each codeword that satisfies the following formula: [(SFN×numberOfSlotsPerFrame×numberOfSymbolsPerSlot)+(number of time slots in the frame×numberOfSymbolsPerSlot)+number of codewords in the time slot]=(time domain offset×numberOfSymbolsPerSlot+S+N×periodicity)mod(1024×numberOfSlotsPerFrame×numberOfSymbolsPerSlot), where N≥0. For the second type of configured grant operation (which may be referred to as configured grant type 2), the MAC entity may consider the uplink grant to recur in each symbol satisfying the following equation: [(SFN×numberOfSlotsPerFrame×numberOfSymbolsPerSlot)+(number of slots in the frame×numberOfSymbolsPerSlot)+number of symbols in the slot]=[(SFN 起始时间 ×numberOfSlotsPerFrame×numberOfSymbolsPerSlot+time slot 起始时间 ×numberOfSymbolsPerSlot+code element 起始时间 )+N×periodicity]mod(1024×numberOfSlotsPerFrame×numberOfSymbolsPerSlot), where SFN 起始时间 , Time Slot 起始时间 and code element 起始时间, timeslot, and symbol, respectively, corresponding to the first transmission opportunity of the physical uplink shared channel (PUSCH) in which an uplink grant is initialized (or reinitialized). In both configured grant types, the UE may calculate the parameter SFN×numberOfSlotsPerFrame×numberOfSymbolsPerSlot using the selected SFN (e.g., the first SFN or the second SFN) as input.

[0127] For a short DRX cycle, the UE may calculate the starting point drx-start offset of the DRX on duration according to the formula [(SFN×10)+subframe number] mod(drx-short cycle)=(drx-start offset) mod(drx-short cycle). For a long DRX cycle, the UE may calculate the starting point drx-start offset of the DRX on duration according to the formula [(SFN×10)+subframe number] mod(drx-long cycle)=drx-start offset. For two DRX cycle lengths, the UE may use the selected SFN (e.g., the first SFN or the second SFN) as input to calculate the parameter [(SFN×10)+subframe number].

[0128] For communications in FR2, the UE may calculate that the first subframe of the gap occurs at a SFN satisfying the following equation: SFN modT = floor(gap offset / 10) and at a subframe satisfying the following equation: subframe = gap offset mod 10, where T = MGRP / 10 and MGRP represents the measurement gap repetition period. In a standalone NR connectivity scheme or a dual connectivity scheme (e.g., Next Generation Radio Access Network (NG-RAN), Evolved Universal Terrestrial Radio Access (E-UTRA) -NR dual connectivity (NG) EN-DC, NR-E-UTRA dual connectivity (NE-DC), E-UTRA-NR dual connectivity (EN-DC), NR dual connectivity (NR-DC), etc.), the first subframe of the gap may occur at a SFN and subframe associated with a base station 305 operating in FR2. The UE may select which SFN to use according to the selection techniques described herein. In some examples (such as in NE-DC or NR-DC schemes), the base station 305 may indicate which SFN to use in the refServCellIndicator field of the RRC message. The refServCellIndicator field may include values ​​pCell, pSCell, or mcg-FR2, where these values ​​correspond to pCell of MCG, pSCell of SCG, and base station 305 in MCG operating in FR2, respectively. If the UE operates in a standalone NR connectivity scheme, a (NG) EN-DC scheme, or if a value mcg-FR2 is indicated in the refServCellIndicator field, the UE may select which SFN to use for gap calculation according to the selection techniques described herein. In some examples, if the value mcg-FR2 is indicated in the refServCellIndicator field, the base station 305 may indicate (such as in the refFR2ServCellAsyncCA (reference FR2 serving cell asynchronous CA) field of the RRC message) which serving cell the UE is to use as the FR2 gap timing reference. In some examples, the calculated measurement gap may be applicable to all base stations 305 operating in FR2. In some examples, the calculated measurement gap may be applicable to all base stations 305 in both the MCG and the SCG.

[0129] Figure 4 An example of a process flow 400 for supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is illustrated. In some examples, the process flow 400 can implement aspects of wireless communication systems 100 and 200. For example, the process flow 400 can include a base station 405 and a UE 415, which can be referenced Figure 1 and 2Examples of corresponding devices described. In the following description of process flow 400, operations between base station 405 and UE 415 may be transmitted in an order different from the example order shown, or operations performed by base station 405 and UE 415 may be performed in a different order or at a different time. Some operations may also be omitted from process flow 400, and other operations may be added to process flow 400. The operations performed by base station 405 and UE 415 can support improvements to UE 415 transmission operations, and in some examples, can improve UE 415 reliability and other benefits.

[0130] At 420, UE 415 may identify a misalignment between a first SFN associated with base station 405-a and a second SFN associated with base station 405-b. UE 415 may communicate concurrently with base stations 405 in an asynchronous CA configuration. Several transmission parameters at UE 415 may be calculated using an SFN as input, and thus a misaligned SFN may make it difficult for UE 415 to communicate concurrently with base station 405-a and base station 405-b in a CA configuration. At 420, base station 405-a and base station 405-b may also identify the SFN misalignment.

[0131] In some examples, UE 415 can identify additional base stations 405 (not shown) configured to communicate with UE 415 in the asynchronous CA configuration. UE 415 can identify additional misalignments between the first SFN, the second SFN, and the additional SFNs associated with the additional base stations 405.

[0132] In some examples, base station 405-a or base station 405-b may transmit an explicit indication of which SFN UE 415 is to use for calculating transmission parameters at 425. In some examples, base station 405 may explicitly indicate which SFN UE 415 is to use in an RRC message, for example, by including an associated serving cell index in one or both of the CellGroupConfig or mac-CellGroupConfig fields in the RRC message.

[0133] In some examples, at 430, UE 415 may identify one or more serving cell parameters associated with base station 405-a and base station 405-b. The identified serving cell parameters may affect which SFN UE 415 selects to calculate transmission parameters. In some examples, UE 415 may identify a first serving cell index associated with base station 405-a and a second serving cell index associated with base station 405-b. In some examples, UE 415 may identify a configuration for communicating with base station 405-a or base station 405-b based on semi-persistent scheduling, a configured grant, or a combination thereof. In some examples, UE 415 may identify base station 405-a or base station 405-b as a current serving cell in a CA configuration, where the current serving cell may be a serving cell with which UE 415 most recently communicated. In some examples, UE 415 may identify that base station 405-a and base station 405-b are included in a shared cell group. UE 415 may additionally identify that base station 405-a or base station 405-b is a primary cell within a common cell group (e.g., a PCell in an MCG or a PSCell in an SCG). In some examples, UE 415 may identify that one or both of base station 405-a or base station 405-b are operating in FR2.

[0134] At 435, UE 415 may select a SFN to be used for calculating transmission parameters. Base station 405-a and base station 405-b may additionally identify which SFN UE 415 has selected for efficient communication with UE 415. In some examples, UE 415 may select the SFN based on an indication received from base station 405-a or base station 405-b. In some examples, UE 415 may select a SFN associated with a base station 405 configured for semi-persistent scheduling or configured for granting operation. In some examples, UE 415 may select a SFN associated with a current serving cell. In some examples, UE 415 may select a SFN associated with a primary cell of a shared cell group. In some examples, UE 415 may select a SFN associated with a base station 405 having a maximum serving cell index or a minimum serving cell index among base stations 405 operating in FR2.

[0135] In some examples, UE 415 can update the selected SFN based on the additional misalignment between the first SFN, the second SFN, and the additional SFN. The updated SFN can include the first SFN, the second SFN, or one of the additional SFNs.

[0136] At 440, the UE 415 may calculate one or more transmission parameters using the selected SFN as input. The base station 405-a and the base station 405-b may additionally calculate one or more transmission parameters to efficiently communicate with the UE 415. In some examples, the one or more transmission parameters may include a HARQ process ID, a time slot in which a downlink assignment occurs, a codeword in which an uplink grant occurs, a starting point for an on duration of a DRX cycle, a measurement gap timing for communications in a frequency range (e.g., FR2), or a combination thereof. In some examples, the UE 415 may calculate a measurement gap that applies to all base stations 405 operating in FR2 using the selected SFN. In some examples, the calculated measurement gap may be applied to all base stations 405 in both the MCG and the SCG. In some examples, the UE 415 may calculate the one or more transmission parameters based on the updated SFN.

[0137] At 445, UE 415 may communicate with at least one of base station 405-a and base station 405-b based on the calculated transmission parameters. Operations performed by base station 405 and UE 415 may support improvements to UE 415 communication operations and, in some examples, may improve UE 415 reliability and other benefits.

[0138] Figure 5 A block diagram 500 of a device 505 supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure 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 communication manager 515, and a transmitter 520. The device 505 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0139] The receiver 510 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to signaling in asynchronous carrier aggregation, etc.). The information may be passed to other components of the device 505. The receiver 510 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The receiver 510 may utilize a single antenna or a collection of antennas.

[0140] The communication manager 515 may identify that the UE is configured to communicate with a first service cell and with a second service cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first service cell and a second SFN associated with the second service cell; select an SFN for transmission parameter calculation input from the first SFN and the second SFN based on the presence of the misalignment; calculate transmission parameters based on the selected SFN; and communicate with at least one of the first service cell and the second service cell based on the calculated transmission parameters.

[0141] The communication manager 515 as described herein may be implemented to achieve one or more potential advantages. One implementation may allow the device 505 to communicate with multiple base stations 105 (e.g., Figure 1 5. The communication manager 515 may be an example of aspects of the communication manager 810 described herein.

[0142] The communication manager 515 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 515 or its subcomponents may be performed by a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device designed to perform the functions described in the present disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0143] The communication manager 515 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 515 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0144] The transmitter 520 may transmit signals generated by other components of the device 505. In some examples, the transmitter 520 may be co-located with the receiver 510 in a transceiver module. For example, the transmitter 520 may be a reference Figure 8Examples of aspects of the described transceiver 820. The transmitter 520 may utilize a single antenna or a collection of antennas.

[0145] Figure 6 A block diagram 600 of a device 605 supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure 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 communication manager 615, and a transmitter 640. The device 605 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0146] The receiver 610 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to signaling in asynchronous carrier aggregation, etc.). The information may be passed to other components of the device 605. The receiver 610 may be a reference Figure 8 Examples of aspects of the described transceiver 820. The receiver 610 may utilize a single antenna or a collection of antennas.

[0147] The communication manager 615 may be an example of aspects of the communication manager 515 as described herein. The communication manager 615 may include a misalignment identification component 620, a SFN selection manager 625, a transmission parameter manager 630, and a serving cell communication component 635. The communication manager 615 may be an example of aspects of the communication manager 810 described herein.

[0148] Misalignment identifying component 620 can identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first serving cell and a second SFN associated with the second serving cell.

[0149] The SFN selection manager 625 may select a SFN for transmission parameter calculation input from the first SFN and the second SFN based on the presence of the misalignment.

[0150] The transmission parameter manager 630 may calculate the transmission parameters based on the selected SFN.

[0151] Serving cell communicating component 635 can communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameters.

[0152] The transmitter 640 may transmit signals generated by other components of the device 605. In some examples, the transmitter 640 may be co-located with the receiver 610 in a transceiver module. For example, the transmitter 640 may be a reference Figure 8Examples of aspects of the described transceiver 820. The transmitter 640 may utilize a single antenna or a collection of antennas.

[0153] Figure 7 A block diagram 700 of a communication manager 705 supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown. The communication manager 705 may be an example of aspects of the communication manager 515, the communication manager 615, or the communication manager 810 described herein. The communication manager 705 may include a misalignment identification component 710, a SFN selection manager 715, a transmission parameter manager 720, a serving cell communication component 725, a serving cell identification manager 730, and a cell group component 735. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0154] The misalignment identification component 710 can identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first serving cell and a second SFN associated with the second serving cell. In some examples, the misalignment identification component 710 can identify that the UE is further configured to communicate with one or more additional serving cells, wherein there is a second misalignment between the first SFN, the second SFN, and the additional SFNs associated with the one or more additional serving cells.

[0155] The SFN selection manager 715 may select an SFN for transmission parameter calculation input from the first SFN and the second SFN based on the presence of the misalignment. In some examples, the SFN selection manager 715 may select the first SFN or the second SFN based on one of the first serving cell and the second serving cell being a configured serving cell. In some examples, the SFN selection manager 715 may select the first SFN or the second SFN based on one of the first serving cell and the second serving cell being a current serving cell.

[0156] In some examples, the SFN selection manager 715 may select the first SFN or the second SFN based on one of the first serving cell and the second serving cell having the smallest serving cell index among the serving cells operating in frequency range 2. In some examples, the SFN selection manager 715 may select the first SFN or the second SFN based on one of the first serving cell and the second serving cell having the largest serving cell index among the serving cells operating in frequency range 2.

[0157] In some examples, the SFN selection manager 715 may select the first SFN or the second SFN based on one of the first serving cell and the second serving cell being the primary cell. In some examples, the SFN selection manager 715 may select the first SFN or the second SFN based on the indication. In some examples, the SFN selection manager 715 may update the selected SFN based on the second misalignment, wherein the updated SFN includes the first SFN, the second SFN, or one of the additional SFNs.

[0158] The transmission parameter manager 720 may calculate the transmission parameters based on the selected SFN. In some examples, the transmission parameter manager 720 may calculate the transmission parameters based on the updated SFN. In some cases, the transmission parameters include a HARQ process identifier for semi-persistent scheduling or configured grant operation. In some cases, the transmission parameters include a time slot associated with a downlink assignment occurrence in a semi-persistent scheduling operation. In some cases, the transmission parameters include one or more symbols associated with an uplink grant occurrence in a configured grant operation. In some cases, the transmission parameters include a starting point for the start duration in a discontinuous reception cycle. In some cases, the transmission parameters include measurement gap timing for serving cell operations in frequency range 2. In some examples, the transmission parameter manager 720 may calculate a measurement gap for a serving cell operating in frequency range 2 based on a selected system frame number. In some examples, the transmission parameter manager 720 may calculate a measurement gap for serving cells in MCG and SCG based on a selected system frame number.

[0159] Serving cell communicating component 725 can communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameters.

[0160] The serving cell identification manager 730 may identify one of the first serving cell and the second serving cell as a configured serving cell configured for at least one of semi-persistent scheduled communications or configured granted communications. In some examples, the serving cell identification manager 730 may identify one of the first serving cell and the second serving cell as a current serving cell.

[0161] In some examples, the serving cell identification manager 730 may identify that one of the first serving cell and the second serving cell is operating in frequency range 2 and has the smallest serving cell index among the first serving cell and the second serving cell operating in frequency range 2. In some examples, the serving cell identification manager 730 may identify that one of the first serving cell and the second serving cell is operating in frequency range 2 and has the largest serving cell index among the first serving cell and the second serving cell operating in frequency range 2.

[0162] In some examples, the serving cell identity manager 730 may receive an indication that one of the first serving cell or the second serving cell may be associated with the selected SFN. In some examples, the serving cell identity manager 730 may receive the indication via a radio resource control message. In some cases, the indication may include a cell index. In some cases, the first serving cell may be associated with a first RAT and the second serving cell may be associated with a second RAT. In some cases, the first RAT may be different from the second RAT.

[0163] The cell group component 735 may identify that the first serving cell and the second serving cell are part of the same cell group. In some examples, the cell group component 735 may identify a primary cell within the same cell group. In some cases, the primary cell in the same cell group is a PCell of an MCG. In some cases, the primary cell in the same cell group is a PSCell of an SCG.

[0164] Figure 8 A diagram of a system 800 including a device 805 supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure 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 a component of the device 505, a device 605, or a UE 115. The device 805 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 810, an I / O controller 815, a transceiver 820, an antenna 825, a memory 830, and a processor 840. These components may be in electronic communication via one or more buses (e.g., a bus 845).

[0165] The communication manager 810 may identify that the UE is configured to communicate with a first service cell and with a second service cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first service cell and a second SFN associated with the second service cell; select an SFN for transmission parameter calculation input from the first SFN and the second SFN based on the presence of the misalignment; calculate transmission parameters based on the selected SFN; and communicate with at least one of the first service cell and the second service cell based on the calculated transmission parameters.

[0166] I / O controller 815 can manage input and output signals of device 805. I / O controller 815 can also manage peripheral devices that are not integrated into device 805. In some cases, I / O controller 815 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 815 can utilize an operating system, such as Or another known operating system. In other cases, I / O controller 815 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, I / O controller 815 may be implemented as part of a processor. In some cases, a user may interact with device 805 via I / O controller 815 or via hardware components controlled by I / O controller 815.

[0167] The transceiver 820 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 820 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 820 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0168] In some cases, a wireless device may include a single antenna 825. However, in some cases, the device may have more than one antenna 825, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0169] 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, cause the processor to perform the various functions described herein. In some cases, the memory 830 may include, among other things, a basic input / output system (BIOS), which may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0170] The processor 840 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a central processing unit (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 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., memory 830) to cause the device 805 to perform various functions (e.g., functions or tasks that support signaling in asynchronous carrier aggregation).

[0171] The processor 840 of the device 805 (e.g., controlling the receiver 510, the transmitter 520, or the transceiver 820) can reduce power consumption and improve communication efficiency based on which SFN is selected for calculating transmission parameters for communication with the serving cell. In some examples, the processor 840 of the device 805 can reconfigure parameters associated with calculating transmission parameters for communication with one or more serving cells. For example, the processor 840 of the device 805 can turn on one or more processing units for processing communications, increase processing clocks, or similar mechanisms within the device 805. In this way, when subsequent transmission parameters are calculated, the processor 840 can be ready to respond more efficiently by reducing the ramp-up of processing power. Improvements in power savings and communication efficiency can further increase battery life at the device 805 (e.g., by reducing or eliminating unnecessary or failed communications, etc.).

[0172] The code 835 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 835 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 835 may not be directly executed by the processor 840, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0173] Fig. 9 A block diagram 900 of a device 905 supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown. The device 905 may be an example of aspects of a base station 105 as described herein. The device 905 may include a receiver 910, a communication manager 915, and a transmitter 920. The device 905 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0174] The receiver 910 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to signaling in asynchronous carrier aggregation, etc.). The information may be passed to other components of the device 905. The receiver 910 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 910 may utilize a single antenna or a collection of antennas.

[0175] The communication manager 915 may determine a misalignment between a first SFN associated with a first serving cell and a second SFN associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a UE via asynchronous carrier aggregation; identify a selected SFN for transmission parameter calculation input from the first SFN and the second SFN based on the presence of the misalignment; calculate transmission parameters based on the selected SFN; and communicate with the UE based on the calculated transmission parameters.

[0176] The communication manager 915 as described herein may be implemented to achieve one or more potential advantages. One implementation may allow the device 905 to communicate with the UE 115 (e.g., Figure 1 115) to communicate to save power. For example, the device 905 can improve the reliability of communication with the UE 115 because the device 905 can be able to identify the SFN selected at the UE 115 and adjust the communication accordingly. The communication manager 915 can be an example of various aspects of the communication manager 1210 described herein.

[0177] The communication manager 915 or its subcomponents may be implemented in hardware, in code (e.g., software or firmware) executed by a processor, or any combination thereof. If implemented in code executed by a processor, the functions of the communication manager 915 or its subcomponents may be performed by a general purpose processor, DSP, ASIC, FPGA or other programmable logic device designed to perform the functions described in this disclosure, discrete gate or transistor logic, discrete hardware components, or any combination thereof.

[0178] The communication manager 915 or its subcomponents may be physically located at various locations, including being distributed such that portions of functionality are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of the present disclosure, the communication manager 915 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, a transceiver, a network server, another computing device, one or more other components described in the present disclosure, or a combination thereof.

[0179] The transmitter 920 may transmit signals generated by other components of the device 905. In some examples, the transmitter 920 may be co-located with the receiver 910 in a transceiver module. For example, the transmitter 920 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 920 may utilize a single antenna or a collection of antennas.

[0180] Fig.10 A block diagram 1000 of a device 1005 supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown. The device 1005 may be an example of aspects of the device 905 or base station 105 as described herein. The device 1005 may include a receiver 1010, a communication manager 1015, and a transmitter 1040. The device 1005 may also include a processor. Each of these components may be in communication with each other (e.g., via one or more buses).

[0181] The receiver 1010 may receive information such as packets, user data, or control information associated with various information channels (e.g., control channels, data channels, and information related to signaling in asynchronous carrier aggregation, etc.). The information may be passed to other components of the device 1005. The receiver 1010 may be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The receiver 1010 may utilize a single antenna or a collection of antennas.

[0182] Communications manager 1015 may be an example of aspects of communications manager 915 as described herein. Communications manager 1015 may include CA misalignment component 1020, SFN identification manager 1025, transmission parameter component 1030, and UE communication component 1035. Communications manager 1015 may be an example of aspects of communications manager 1210 as described herein.

[0183] CA misalignment component 1020 can determine a misalignment between a first SFN associated with a first serving cell and a second SFN associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with the UE via asynchronous carrier aggregation.

[0184] The SFN identification manager 1025 may identify a selected SFN from among the first SFN and the second SFN for transmission parameter calculation input based on the presence of the misalignment.

[0185] Transmission parameter component 1030 can calculate transmission parameters based on the selected SFN.

[0186] The UE communication component 1035 can communicate with the UE based on the calculated transmission parameters.

[0187] Transmitter 1040 can transmit signals generated by other components of device 1005. In some examples, transmitter 1040 can be co-located with receiver 1010 in a transceiver module. For example, transmitter 1040 can be a reference Fig.12 Examples of various aspects of the described transceiver 1220. The transmitter 1040 may utilize a single antenna or a collection of antennas.

[0188] Fig.11 A block diagram 1100 of a communication manager 1105 supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown. The communication manager 1105 may be an example of aspects of the communication manager 915, the communication manager 1015, or the communication manager 1210 described herein. The communication manager 1105 may include a CA misalignment component 1110, a SFN identification manager 1115, a transmission parameter component 1120, a UE communication component 1125, a serving cell identification component 1130, and a cell group manager 1135. Each of these modules may communicate directly or indirectly with each other (e.g., via one or more buses).

[0189] The CA misalignment component 1110 can determine a misalignment between a first SFN associated with a first serving cell and a second SFN associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with the UE via asynchronous carrier aggregation. In some examples, the CA misalignment component 1110 can identify that the UE is further configured to communicate with one or more additional serving cells, wherein there is a second misalignment between the first SFN, the second SFN, and the additional SFNs associated with the one or more additional serving cells.

[0190] The SFN identification manager 1115 may identify a selected SFN from the first SFN and the second SFN for transmission parameter calculation input based on the presence of the misalignment. In some examples, the SFN identification manager 1115 may identify the first SFN or the second SFN as the selected SFN based on one of the first serving cell and the second serving cell being a configured serving cell. In some examples, the SFN identification manager 1115 may identify the first SFN or the second SFN as the selected SFN based on one of the first serving cell and the second serving cell being a current serving cell.

[0191] In some examples, the SFN identification manager 1115 may identify the first SFN or the second SFN as the selected SFN based on one of the first serving cell and the second serving cell having the smallest serving cell index among the serving cells operating in frequency range 2. In some examples, the SFN identification manager 1115 may identify the first SFN or the second SFN as the selected SFN based on one of the first serving cell and the second serving cell having the largest serving cell index among the serving cells operating in frequency range 2.

[0192] In some examples, the SFN identification manager 1115 may identify the first SFN or the second SFN as the selected SFN based on one of the first serving cell and the second serving cell being the primary cell. In some examples, the SFN identification manager 1115 may identify the first SFN or the second SFN as the selected SFN based on the transmitted indication. In some examples, the SFN identification manager 1115 may update the selected SFN based on the second misalignment, wherein the updated SFN includes the first SFN, the second SFN, or one of the additional SFNs.

[0193] The transmission parameter component 1120 may calculate the transmission parameter based on the selected SFN. In some examples, the transmission parameter component 1120 may calculate the transmission parameter based on the updated SFN. In some cases, the transmission parameter includes a HARQ process identifier for semi-persistent scheduling or configured grant operation. In some cases, the transmission parameter includes a time slot associated with a downlink assignment occurrence in a semi-persistent scheduling operation. In some cases, the transmission parameter includes one or more codewords associated with an uplink grant occurrence in a configured grant operation. In some cases, the transmission parameter includes a starting point for the start duration in a discontinuous reception cycle. In some examples, the transmission parameter component 1120 may calculate a measurement gap for a serving cell operating in frequency range 2 based on a selected system frame number. In some examples, the transmission parameter component 1120 may calculate a measurement gap for a serving cell in MCG and SCG based on a selected system frame number.

[0194] In some cases, the transmission parameters include measurement gap timing for serving cell operation in frequency range 2.

[0195] The UE communication component 1125 can communicate with the UE based on the calculated transmission parameters.

[0196] The serving cell identification component 1130 may identify that one of the first serving cell and the second serving cell is a configured serving cell configured for at least one of semi-persistent scheduled communications or configured granted communications. In some examples, the serving cell identification component 1130 may identify that one of the first serving cell and the second serving cell is a current serving cell.

[0197] In some examples, the serving cell identification component 1130 may identify that one of the first serving cell and the second serving cell is operating in frequency range 2 and has the smallest serving cell index among the serving cells operating in frequency range 2. In some examples, the serving cell identification component 1130 may identify that one of the first serving cell and the second serving cell is operating in frequency range 2 and has the largest serving cell index among the serving cells operating in frequency range 2.

[0198] In some examples, the serving cell identification component 1130 may transmit an indication that one of the first serving cell or the second serving cell may be associated with the selected SFN. In some examples, the serving cell identification component 1130 may transmit the indication via a radio resource control message. In some cases, the indication includes a cell index. In some cases, the first serving cell may be associated with a first RAT and the second serving cell may be associated with a second RAT. In some cases, the first RAT may be different from the second RAT.

[0199] The cell group manager 1135 may identify that the first serving cell and the second serving cell are part of the same cell group. In some examples, the cell group manager 1135 may identify a primary cell within the same cell group. In some cases, the primary cell in the same cell group may be a PCell of an MCG. In some cases, the primary cell in the same cell group may be a PSCell of an SCG.

[0200] Fig.12A diagram of a system 1200 including a device 1205 supporting signaling in asynchronous carrier aggregation according to various aspects of the present disclosure is shown. The device 1205 may be an example of a device 905, a device 1005, or a base station 105 as described herein or include components of the above devices. The device 1205 may include components for two-way voice and data communications, including components for transmitting and receiving communications, including a communication manager 1210, a network communication manager 1215, a transceiver 1220, an antenna 1225, a memory 1230, a processor 1240, and an inter-station communication manager 1245. These components may be in electronic communication via one or more buses (e.g., bus 1250).

[0201] The communication manager 1210 may determine a misalignment between a first SFN associated with a first serving cell and a second SFN associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a UE via asynchronous carrier aggregation; identify a selected SFN for transmission parameter calculation input from the first SFN and the second SFN based on the presence of the misalignment; calculate transmission parameters based on the selected SFN; and communicate with the UE based on the calculated transmission parameters.

[0202] The network communications manager 1215 may manage communications with the core network (eg, via one or more wired backhaul links). For example, the network communications manager 1215 may manage the delivery of data communications for client devices, such as one or more UEs 115.

[0203] The transceiver 1220 may communicate bidirectionally via one or more antennas, wired or wireless links, as described above. For example, the transceiver 1220 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 1220 may also include a modem to modulate packets and provide the modulated packets to an antenna for transmission, and demodulate packets received from an antenna.

[0204] In some cases, a wireless device may include a single antenna 1225. However, in some cases, the device may have more than one antenna 1225, which may be capable of transmitting or receiving multiple wireless transmissions concurrently.

[0205] The memory 1230 may include RAM, ROM, or a combination thereof. The memory 1230 may store computer readable code 1235 including instructions that, when executed by a processor (e.g., processor 1240), cause the device to perform various functions described herein. In some cases, the memory 1230 may include, among other things, a BIOS that may control basic hardware or software operations, such as interaction with peripheral components or devices.

[0206] Processor 1240 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, processor 1240 may be configured to operate a memory array using a memory controller. In some cases, the memory controller may be integrated into processor 1240. Processor 1240 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 1230) to cause device 1205 to perform various functions (e.g., functions or tasks that support signaling in asynchronous carrier aggregation).

[0207] The inter-site communication manager 1245 may manage communications with other base stations 105 and may include a controller or scheduler for controlling communications with UE 115 in cooperation with other base stations 105. For example, the inter-site communication manager 1245 may coordinate scheduling of transmissions to UE 115 for various interference mitigation techniques such as beamforming or joint transmission. In some examples, the inter-site communication manager 1245 may provide an X2 interface within an LTE / LTE-A wireless communication network technology to provide communications between base stations 105.

[0208] The code 1235 may include instructions for implementing various aspects of the present disclosure, including instructions for supporting wireless communications. The code 1235 may be stored in a non-transitory computer-readable medium, such as a system memory or other type of memory. In some cases, the code 1235 may not be directly executed by the processor 1240, but may cause a computer (e.g., when compiled and executed) to perform the functions described herein.

[0209] Fig.13 1 is a flow chart illustrating a method 1300 for supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure. The operations of the method 1300 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1300 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0210] At 1305, the UE may identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first serving cell and a second SFN associated with the second serving cell. The operations of 1305 may be performed according to the methods described herein. In some examples, aspects of the operations of 1305 may be performed as described with reference to Figures 5 to 8 The described misalignment identification assembly is performed.

[0211] At 1310, the UE may select a SFN from the first SFN and the second SFN for transmission parameter calculation input based on the presence of the misalignment. The operations of 1310 may be performed according to the methods described herein. In some examples, aspects of the operations of 1310 may be performed as described with reference to Figures 5 to 8 The described SFN selection manager is performed.

[0212] At 1315, the UE may calculate transmission parameters based on the selected SFN. The operations of 1315 may be performed according to the methods described herein. In some examples, aspects of the operations of 1315 may be performed as described with reference to Figures 5 to 8 The described transmission parameter manager is implemented.

[0213] At 1320, the UE may communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameters. The operations of 1320 may be performed according to the methods described herein. In some examples, aspects of the operations of 1320 may be performed as described with reference to Figures 5 to 8 The described serving cell communication component is performed.

[0214] Fig.14 1 is a flow chart illustrating a method 1400 for supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure. The operations of the method 1400 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1400 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0215] At 1405, the UE may identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first serving cell and a second SFN associated with the second serving cell. The operations of 1405 may be performed according to the methods described herein. In some examples, aspects of the operations of 1405 may be performed as described with reference to Figures 5 to 8 The described misalignment identification assembly is performed.

[0216] At 1410, the UE may identify that one of the first serving cell and the second serving cell is a configured serving cell configured for at least one of semi-persistent scheduled communications or configured granted communications. The operations of 1410 may be performed according to the methods described herein. In some examples, aspects of the operations of 1410 may be performed as described with reference to Figures 5 to 8 The described serving cell identity manager is performed.

[0217] At 1415, the UE may select the first SFN or the second SFN for transmission parameter calculation input based on the presence of the misalignment and based on one of the first serving cell and the second serving cell being a configured serving cell. The operations of 1415 may be performed according to the methods described herein. In some examples, aspects of the operations of 1415 may be performed as described with reference to Figures 5 to 8 The described SFN selection manager is performed.

[0218] At 1420, the UE may calculate transmission parameters based on the selected SFN. The operations of 1420 may be performed according to the methods described herein. In some examples, aspects of the operations of 1420 may be performed as described with reference to Figures 5 to 8 The described transmission parameter manager is implemented.

[0219] At 1425, the UE may communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameters. The operations of 1425 may be performed according to the methods described herein. In some examples, aspects of the operations of 1425 may be performed as described with reference to Figures 5 to 8 The described serving cell communication component is performed.

[0220] Fig.15 A flow chart illustrating a method 1500 for supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure is shown. The operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1500 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0221] At 1505, the UE may identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first serving cell and a second SFN associated with the second serving cell. The operations of 1505 may be performed according to the methods described herein. In some examples, aspects of the operations of 1505 may be performed as described with reference to Figures 5 to 8 The described misalignment identification assembly is performed.

[0222] At 1510, the UE may identify one of the first serving cell and the second serving cell as the current serving cell. The operations of 1510 may be performed according to the methods described herein. In some examples, aspects of the operations of 1510 may be performed as described with reference to Figures 5 to 8 The described serving cell identity manager is performed.

[0223] At 1515, the UE may select the first SFN or the second SFN for transmission parameter calculation input based on the presence of the misalignment and based on one of the first serving cell and the second serving cell being the current serving cell. The operations of 1515 may be performed according to the methods described herein. In some examples, aspects of the operations of 1515 may be performed as described with reference to Figures 5 to 8 The described SFN selection manager is performed.

[0224] At 1520, the UE may calculate transmission parameters based on the selected SFN. The operations of 1520 may be performed according to the methods described herein. In some examples, aspects of the operations of 1520 may be performed as described with reference to Figures 5 to 8 The described transmission parameter manager is implemented.

[0225] At 1525, the UE may communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameters. The operations of 1525 may be performed according to the methods described herein. In some examples, aspects of the operations of 1525 may be performed as described with reference to Figures 5 to 8 The described serving cell communication component is performed.

[0226] Fig.16 1 is a flow chart illustrating a method 1600 for supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure. The operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. For example, the operations of the method 1600 may be implemented by a UE 115 or a component thereof as described herein. Figures 5 to 8 In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0227] At 1605, the UE may identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first serving cell and a second SFN associated with the second serving cell. The operations of 1605 may be performed according to the methods described herein. In some examples, aspects of the operations of 1605 may be performed as described with reference to Figures 5 to 8 The described misalignment identification assembly is performed.

[0228] At 1610, the UE may identify that one of the first serving cell and the second serving cell is operating in frequency range 2 and has a minimum or maximum serving cell index among the first serving cell and the second serving cell operating in frequency range 2. The operations of 1610 may be performed according to the methods described herein. In some examples, aspects of the operations of 1610 may be performed as described with reference to Figures 5 to 8 The described serving cell identity manager is performed.

[0229] At 1615, the UE may select the first SFN or the second SFN for transmission parameter calculation input based on the presence of the misalignment and based on one of the first serving cell and the second serving cell having the minimum or maximum serving cell index among serving cells operating in frequency range 2. The operations of 1615 may be performed according to the methods described herein. In some examples, aspects of the operations of 1615 may be performed as described with reference to Figures 5 to 8 The described SFN selection manager is performed.

[0230] At 1620, the UE may calculate transmission parameters based on the selected SFN. The operations of 1620 may be performed according to the methods described herein. In some examples, aspects of the operations of 1620 may be performed as described with reference to Figures 5 to 8 The described transmission parameter manager is implemented.

[0231] At 1625, the UE may communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameters. The operations of 1625 may be performed according to the methods described herein. In some examples, aspects of the operations of 1625 may be performed as described with reference to Figures 5 to 8 The described serving cell communication component is performed.

[0232] Fig.17 1 is a flow chart illustrating a method 1700 for supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure. The operations of the method 1700 may be implemented by a UE 115 or components thereof as described herein. For example, the operations of the method 1700 may be implemented by a UE 115 or components thereof as described herein. Figures 5 to 8In some examples, the UE may execute an instruction set to control the functional elements of the UE to perform the functions described below. Additionally or alternatively, the UE may use dedicated hardware to perform various aspects of the functions described below.

[0233] At 1705, the UE may identify that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first SFN associated with the first serving cell and a second SFN associated with the second serving cell. The operations of 1705 may be performed according to the methods described herein. In some examples, aspects of the operations of 1705 may be performed as described with reference to Figures 5 to 8 The described misalignment identification assembly is performed.

[0234] At 1710, the UE may receive an indication that one of the first serving cell or the second serving cell is associated with a selected SFN. The operations of 1710 may be performed according to the methods described herein. In some examples, aspects of the operations of 1710 may be performed as described with reference to Figures 5 to 8 The described serving cell identity manager is performed.

[0235] At 1715, the UE may select the first SFN or the second SFN for transmission parameter calculation input based on the presence of the misalignment and based on the indication. The operations of 1715 may be performed according to the methods described herein. In some examples, aspects of the operations of 1715 may be as described with reference to Figures 5 to 8 The described SFN selection manager is performed.

[0236] At 1720, the UE may calculate transmission parameters based on the selected SFN. The operations of 1720 may be performed according to the methods described herein. In some examples, aspects of the operations of 1720 may be performed as described with reference to Figures 5 to 8 The described transmission parameter manager is implemented.

[0237] At 1725, the UE may communicate with at least one of the first serving cell and the second serving cell based on the calculated transmission parameters. The operations of 1725 may be performed according to the methods described herein. In some examples, aspects of the operations of 1725 may be performed as described with reference to Figures 5 to 8 The described serving cell communication component is performed.

[0238] Fig.18 1 is a flow chart illustrating a method 1800 for supporting signaling in asynchronous carrier aggregation according to aspects of the present disclosure. The operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. For example, the operations of the method 1800 may be implemented by a base station 105 or components thereof as described herein. Figures 9 to 12In some examples, the base station may execute an instruction set to control the functional elements of the base station to perform the functions described below. Additionally or alternatively, the base station may use dedicated hardware to perform various aspects of the functions described below.

[0239] At 1805, the base station may determine a misalignment between a first SFN associated with a first serving cell and a second SFN associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with the UE via asynchronous carrier aggregation. The operations of 1805 may be performed according to the methods described herein. In some examples, aspects of the operations of 1805 may be performed as described with reference to Figures 9 to 12 The described CA is performed with misaligned components.

[0240] At 1810, the base station may identify a selected SFN from the first SFN and the second SFN for transmission parameter calculation input based on the presence of the misalignment. The operations of 1810 may be performed according to the methods described herein. In some examples, aspects of the operations of 1810 may be performed as described with reference to Figures 9 to 12 The SFN identity manager described is used to perform the above.

[0241] At 1815, the base station may calculate transmission parameters based on the selected SFN. The operations of 1815 may be performed according to the methods described herein. In some examples, aspects of the operations of 1815 may be performed as described with reference to Figures 9 to 12 The described transmission parameter component is performed.

[0242] At 1820, the base station may communicate with the UE based on the calculated transmission parameters. The operations of 1820 may be performed according to the methods described herein. In some examples, aspects of the operations of 1820 may be as described with reference to Figures 9 to 12 The described UE communication components are used to perform.

[0243] 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 other implementations are possible. Furthermore, aspects from two or more methods may be combined.

[0244] The following provides an overview of various aspects of the invention:

[0245] Aspect 1: A method for wireless communication at a user equipment (UE), comprising: identifying that the UE is configured to communicate with a first service cell and with a second service cell via asynchronous carrier aggregation, wherein there is a misalignment between a first system frame number associated with the first service cell and a second system frame number associated with the second service cell; selecting a system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based at least in part on the presence of the misalignment; calculating a transmission parameter based at least in part on the selected system frame number; and communicating with at least one of the first service cell and the second service cell based at least in part on the calculated transmission parameter.

[0246] Aspect 2: A method as in Aspect 1, wherein selecting a system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is a configured service cell configured for at least one of semi-persistent scheduled communications or configured granted communications; and selecting the first system frame number or the second system frame number based at least in part on one of the first service cell and the second service cell being a configured service cell.

[0247] Aspect 3: A method as in either Aspect 1 or 2, wherein selecting a system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is a current service cell; and selecting the first system frame number or the second system frame number based at least in part on one of the first service cell and the second service cell being the current service cell.

[0248] Aspect 4: A method as in any one of Aspects 1 to 3, wherein selecting a system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is operating in frequency range 2 and has the smallest service cell index among the first service cell and the second service cell operating in frequency range 2; and selecting the first system frame number or the second system frame number based at least in part on one of the first service cell and the second service cell having the smallest service cell index among the service cells operating in frequency range 2.

[0249] Aspect 5: The method of aspect 4, wherein calculating the transmission parameter comprises: calculating a measurement gap for a serving cell operating in frequency range 2 based at least in part on the selected system frame number.

[0250] Aspect 6: The method of any one of Aspects 4 or 5, wherein calculating the transmission parameter comprises: calculating measurement gaps for serving cells in a master cell group (MCG) and a secondary cell group (SCG) based at least in part on a selected system frame number.

[0251] Aspect 7: A method as in any one of Aspects 1 to 6, wherein selecting a system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is operating in frequency range 2 and has the maximum service cell index among the first service cell and the second service cell operating in frequency range 2; and selecting the first system frame number or the second system frame number based at least in part on one of the first service cell and the second service cell having the maximum service cell index among the service cells operating in frequency range 2.

[0252] Aspect 8: The method of aspect 7, wherein calculating the transmission parameter comprises: calculating a measurement gap for a serving cell operating in frequency range 2 based at least in part on the selected system frame number.

[0253] Aspect 9: The method of any one of Aspects 7 or 8, wherein calculating the transmission parameter comprises: calculating measurement gaps for serving cells in a master cell group (MCG) and a secondary cell group (SCG) based at least in part on a selected system frame number.

[0254] Aspect 10: A method as in any one of Aspects 1 to 9, wherein selecting a system frame number for transmission parameter calculation input includes: identifying that a first service cell and a second service cell are part of the same cell group; identifying a primary cell within the same cell group; and selecting the first system frame number or the second system frame number based at least in part on one of the first service cell and the second service cell being the primary cell.

[0255] Aspect 11: The method of aspect 10, wherein the master cell in the same cell group is a master cell (PCell) in a master cell group (MCG).

[0256] Aspect 12: The method of aspect 10 or 11, wherein the primary cell in the same cell group is a primary secondary cell (PSCell) in a secondary cell group (SCG).

[0257] Aspect 13: A method as in any of Aspects 1 to 12, wherein selecting a system frame number for transmission parameter calculation input comprises: receiving an indication that one of a first service cell or a second service cell is associated with a selected system frame number; and selecting the first system frame number or the second system frame number based at least in part on the indication.

[0258] Aspect 14: The method of Aspect 13, wherein the indication comprises a cell index.

[0259] Aspect 15: The method of any one of Aspects 13 or 14, wherein receiving the indication comprises: receiving the indication via a radio resource control message.

[0260] Aspect 16: The method of any one of aspects 1 to 15, wherein the transmission parameter comprises a hybrid automatic repeat request (HARQ) process identifier for semi-persistent scheduling or configured grant operation.

[0261] Aspect 17: The method of any one of aspects 1 to 16, wherein the transmission parameter comprises a time slot associated with a downlink assignment occurrence in a semi-persistent scheduling operation.

[0262] Aspect 18: The method of any one of aspects 1 to 17, wherein the transmission parameters include one or more symbols associated with an uplink grant occurrence in a configured grant operation.

[0263] Aspect 19: The method of any one of aspects 1 to 18, wherein the transmission parameter comprises a starting point of an on duration in a discontinuous reception cycle.

[0264] Aspect 20: The method of any one of aspects 1 to 19, wherein the transmission parameters include measurement gap timing for serving cell operation in frequency range 2.

[0265] Aspect 21: The method of any one of aspects 1 to 20, wherein the first serving cell is associated with a first radio access technology (RAT) and the second serving cell is associated with a second RAT.

[0266] Aspect 22: The method of Aspect 21, wherein the first RAT is different from the second RAT.

[0267] Aspect 23: A method as in any one of Aspects 1 to 22, further comprising: identifying that the UE is further configured to communicate with one or more additional service cells, wherein there is a second misalignment between the first system frame number, the second system frame number, and an additional system frame number associated with the one or more additional service cells; updating the selected system frame number based at least in part on the second misalignment, wherein the updated system frame number includes the first system frame number, the second system frame number, or one of the additional system frame numbers; and calculating the transmission parameter based at least in part on the updated system frame number.

[0268] Aspect 24: A method for wireless communication at a first service cell, comprising: determining a misalignment between a first system frame number associated with the first service cell and a second system frame number associated with a second service cell, wherein the first service cell and the second service cell are in communication with a user equipment (UE) via asynchronous carrier aggregation; identifying a selected system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based at least in part on the presence of the misalignment; calculating transmission parameters based at least in part on the selected system frame number; and communicating with the UE based at least in part on the calculated transmission parameters.

[0269] Aspect 25: A method as in Aspect 24, wherein identifying a selected system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is a configured service cell configured for at least one of semi-persistent scheduled communications or configured granted communications; and identifying the first system frame number or the second system frame number as the selected system frame number based at least in part on one of the first service cell and the second service cell being a configured service cell.

[0270] Aspect 26: A method as in either Aspect 24 or 25, wherein identifying a selected system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is a current service cell; and identifying the first system frame number or the second system frame number as the selected system frame number based at least in part on one of the first service cell and the second service cell being the current service cell.

[0271] Aspect 27: A method as in any of Aspects 24 to 26, wherein identifying a selected system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is operating in frequency range 2 and has the smallest service cell index among the service cells operating in frequency range 2; and identifying the first system frame number or the second system frame number as the selected system frame number based at least in part on one of the first service cell and the second service cell having the smallest service cell index among the service cells operating in frequency range 2.

[0272] Aspect 28: The method of aspect 27, wherein calculating the transmission parameter comprises: calculating a measurement gap for a serving cell operating in frequency range 2 based at least in part on the selected system frame number.

[0273] Aspect 29: The method of any one of Aspects 27 or 28, wherein calculating the transmission parameter comprises: calculating measurement gaps for serving cells in a master cell group (MCG) and a secondary cell group (SCG) based at least in part on a selected system frame number.

[0274] Aspect 30: A method as in any of Aspects 24 to 29, wherein identifying a selected system frame number for transmission parameter calculation input includes: identifying that one of the first service cell and the second service cell is operating in frequency range 2 and has the maximum service cell index among the service cells operating in frequency range 2; and identifying the first system frame number or the second system frame number as the selected system frame number based at least in part on one of the first service cell and the second service cell having the maximum service cell index among the service cells operating in frequency range 2.

[0275] Aspect 31: The method of aspect 30, wherein calculating the transmission parameter comprises: calculating a measurement gap for a serving cell operating in frequency range 2 based at least in part on the selected system frame number.

[0276] Aspect 32: The method of any one of Aspects 30 or 31, wherein calculating the transmission parameter comprises: calculating measurement gaps for serving cells in a master cell group (MCG) and a secondary cell group (SCG) based at least in part on a selected system frame number.

[0277] Aspect 33: A method as in any one of Aspects 24 to 32, wherein identifying a selected system frame number for transmission parameter calculation input includes: identifying that a first service cell and a second service cell are part of the same cell group; identifying a primary cell within the same cell group; and identifying the first system frame number or the second system frame number as the selected system frame number based at least in part on one of the first service cell and the second service cell being the primary cell.

[0278] Aspect 34: The method of Aspect 33, wherein the master cell in the same cell group is a master cell (PCell) in a master cell group (MCG).

[0279] Aspect 35: The method of Aspect 33 or 34, wherein the primary cell in the same cell group is a primary secondary cell (PSCell) in a secondary cell group (SCG).

[0280] Aspect 36: A method as in any of Aspects 24 to 35, wherein identifying a selected system frame number for transmission parameter calculation input comprises: transmitting an indication that one of the first service cell or the second service cell is associated with the selected system frame number; and identifying the first system frame number or the second system frame number as the selected system frame number based at least in part on the transmitted indication.

[0281] Aspect 37: The method of Aspect 36, wherein the indication comprises a cell index.

[0282] Aspect 38: The method of any one of Aspects 36 or 37, wherein transmitting the indication comprises: transmitting the indication via a radio resource control message.

[0283] Aspect 39: The method of any one of aspects 24 to 38, wherein the transmission parameter comprises a hybrid automatic repeat request (HARQ) process identifier for semi-persistent scheduling or configured grant operation.

[0284] Aspect 40: The method of any one of aspects 24 to 39, wherein the transmission parameter comprises a time slot associated with a downlink assignment occurrence in a semi-persistent scheduling operation.

[0285] Aspect 41: The method of any one of aspects 24 to 40, wherein the transmission parameters include one or more symbols associated with an uplink grant occurrence in a configured grant operation.

[0286] Aspect 42: The method of any one of aspects 24 to 41, wherein the transmission parameter comprises a starting point of an on duration in a discontinuous reception cycle.

[0287] Aspect 43: The method of any one of Aspects 24 to 42, wherein the transmission parameters include measurement gap timing for serving cell operation in frequency range 2.

[0288] Aspect 44: The method of any one of Aspects 24 to 43, wherein the first serving cell is associated with a first radio access technology (RAT) and the second serving cell is associated with a second RAT.

[0289] Aspect 45: The method of Aspect 44, wherein the first RAT is different from the second RAT.

[0290] Aspect 46: A method as in any one of Aspects 24 to 45, further comprising: identifying that the UE is further configured to communicate with one or more additional service cells, wherein there is a second misalignment between the first system frame number, the second system frame number, and an additional system frame number associated with the one or more additional service cells, updating the selected system frame number based at least in part on the second misalignment, wherein the updated system frame number includes the first system frame number, the second system frame number, or one of the additional system frame numbers; and calculating the transmission parameter based at least in part on the updated system frame number.

[0291] Aspect 47: An apparatus for wireless communication at a user equipment (UE), comprising at least one means for performing the method of any one of aspects 1 to 23.

[0292] Aspect 49: An apparatus for wireless communication at a user equipment (UE), 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 the method of any one of Aspects 1 to 23.

[0293] Aspect 50: A non-transitory computer-readable medium storing code for wireless communication at a user equipment (UE), the code comprising instructions executable by a processor to perform the method of any one of aspects 1 to 23.

[0294] Aspect 51: An apparatus for wireless communication at a first serving cell, comprising at least one means for performing the method of any one of Aspects 24 to 46.

[0295] Aspect 53: An apparatus for wireless communication at a first serving cell, 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 the method of any one of Aspects 24 to 46.

[0296] Aspect 54: A non-transitory computer-readable medium storing code for wireless communication at a first serving cell, the code comprising instructions executable by a processor to perform the method of any one of aspects 24 to 46.

[0297] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems 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 applied 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.

[0298] The information and signals described herein may be represented using any of a variety of different techniques and technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout this description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0299] The various illustrative blocks and components described in conjunction with the disclosure herein may be implemented or performed with a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any processor, controller, microcontroller, or state machine. 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).

[0300] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored on or transmitted by a computer-readable medium as one or more instructions or codes. Other examples and implementations fall within the scope of the present 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, hardwiring, or any combination thereof. Features that implement the functions may also be physically located in various locations, including being distributed so that parts of the functions are implemented at different physical locations.

[0301] Computer readable medium includes both non-transient computer storage medium and communication medium, and it includes any medium that facilitates computer program to transfer from one place to another place.Non-transient storage medium can be any available medium that can be accessed by general or special-purpose computer.As an example and not limitation, non-transient computer readable medium can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, compact disk (CD) ROM or other optical disk storage, disk storage or other magnetic storage device, or can be used to carry or store instruction or data structure form of desired program code means and can be accessed by general or special-purpose computer or general or special-purpose processor any other non-transient medium.Similarly, any connection is also properly referred to as computer readable medium.For example, if software is transmitted from website, server or other remote source using coaxial cable, optical fiber cable, twisted pair, digital subscriber line (DSL) or wireless technology such as infrared, radio and microwave, then the coaxial cable, optical fiber cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are just included in the definition of computer readable medium. Disk and disc as used herein include CDs, laser discs, optical discs, digital versatile discs (DVDs), floppy disks, and Blu-ray discs, where disks usually reproduce data magnetically, while discs reproduce data optically with lasers. Combinations of the above are also included within the scope of computer-readable media.

[0302] As used herein (including in the claims), "or" used in a list of items (e.g., a list of items with 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). Similarly, as used herein, the phrase "based on" should not be interpreted as referring 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."

[0303] In the accompanying drawings, similar components or features may have the same reference number. In addition, various components of the same type may be distinguished by following the reference number with a dash and a second reference number that distinguishes between similar components. If only the first reference number is used in the specification, the description may apply to any of the similar components having the same first reference number regardless of the second reference number, or other subsequent reference numbers.

[0304] The descriptions set forth herein in conjunction with the accompanying drawings describe example configurations and do not represent all examples that can be implemented or fall within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration" and does not mean "better than" or "better than other examples." This detailed description includes specific details to provide an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0305] The description herein is provided to enable one of ordinary skill in the art to make or use the present disclosure. Various modifications to the present disclosure will be apparent to one of ordinary skill in the art, and the universal 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. A method for wireless communication at a user equipment (UE), comprising: identifying that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with the second serving cell; selecting a system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based at least in part on the presence of the misalignment, wherein selecting the system frame number for transmission parameter calculation input comprises: receiving an indication that one of the first serving cell or the second serving cell is associated with a selected system frame number, and selecting the first system frame number or the second system frame number based at least in part on the indication; calculating a transmission parameter based at least in part on the selected system frame number; and Communicating with at least one of the first serving cell and the second serving cell based at least in part on the calculated transmission parameters.

2. The method of claim 1, wherein selecting the system frame number for transmission parameter calculation input further comprises: identifying that one of the first serving cell and the second serving cell is a configured serving cell configured for at least one of semi-persistently scheduled communications or configured granted communications; as well as The first system frame number or the second system frame number is selected based at least in part on one of the first serving cell and the second serving cell being the configured serving cell.

3. The method of claim 1, wherein selecting the system frame number for transmission parameter calculation input further comprises: identifying that the first serving cell and the second serving cell are part of the same cell group; Identifying a primary cell within the same cell group; as well as The first system frame number or the second system frame number is selected based at least in part on one of the first serving cell and the second serving cell being the primary cell.

4. The method of claim 3, wherein the primary cell in the same cell group is a primary cell (PCell) in a master cell group (MCG).

5. The method of claim 3, wherein the primary cell in the same cell group is a primary secondary cell (PSCell) in a secondary cell group (SCG).

6. The method of claim 1, wherein the indication comprises a cell index.

7. The method of claim 1 , wherein receiving the indication comprises: The indication is received via a radio resource control message.

8. A method for wireless communication at a first serving cell, comprising: determining a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a user equipment (UE) via asynchronous carrier aggregation; identifying a selected system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based at least in part on the presence of the misalignment, wherein identifying the selected system frame number for transmission parameter calculation input comprises: transmitting an indication that one of the first serving cell or the second serving cell is associated with the selected system frame number, and identifying the first system frame number or the second system frame number as the selected system frame number based at least in part on the transmitted indication; calculating a transmission parameter based at least in part on the selected system frame number; and Communicating with the UE is performed based at least in part on the calculated transmission parameters.

9. The method of claim 8, wherein identifying the selected system frame number for transmission parameter calculation input further comprises: identifying that one of the first serving cell and the second serving cell is a configured serving cell configured for at least one of semi-persistently scheduled communications or configured granted communications; as well as The first system frame number or the second system frame number is identified as the selected system frame number based at least in part on one of the first serving cell and the second serving cell being the configured serving cell.

10. The method of claim 8, wherein identifying the selected system frame number for transmission parameter calculation input further comprises: identifying that the first serving cell and the second serving cell are part of the same cell group; Identifying a primary cell within the same cell group; as well as The first system frame number or the second system frame number is identified as the selected system frame number based at least in part on one of the first serving cell and the second serving cell being the primary cell.

11. The method of claim 10, wherein the primary cell in the same cell group is a primary cell (PCell) in a master cell group (MCG).

12. The method of claim 10, wherein the primary cell in the same cell group is a primary secondary cell (PSCell) in a secondary cell group (SCG).

13. The method of claim 8, wherein the indication comprises a cell index.

14. The method of claim 8, wherein transmitting the indication comprises: The indication is transmitted via a radio resource control message.

15. An apparatus for wireless communication at a user equipment (UE), comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the apparatus to: identifying that the UE is configured to communicate with a first serving cell and with a second serving cell via asynchronous carrier aggregation, wherein there is a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with the second serving cell; selecting a system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based at least in part on the presence of the misalignment, wherein the instructions are further executable by the processor to cause the apparatus to: receive an indication that one of the first serving cell or the second serving cell is associated with a selected system frame number, and select the first system frame number or the second system frame number based at least in part on the indication; calculating a transmission parameter based at least in part on the selected system frame number; as well as Communicating with at least one of the first serving cell and the second serving cell based at least in part on the calculated transmission parameters.

16. The apparatus of claim 15, wherein the instructions are further executable by the processor to cause the apparatus to: identifying that one of the first serving cell and the second serving cell is a configured serving cell configured for at least one of semi-persistently scheduled communications or configured granted communications; and The first system frame number or the second system frame number is selected based at least in part on one of the first serving cell and the second serving cell being the configured serving cell.

17. The apparatus of claim 15, wherein the instructions are further executable by the processor to cause the apparatus to: identifying that the first serving cell and the second serving cell are part of the same cell group; identifying a primary cell within the same cell cluster; and The first system frame number or the second system frame number is selected based at least in part on one of the first serving cell and the second serving cell being the primary cell.

18. The apparatus of claim 17, wherein the primary cell in the same cell group is a primary cell (PCell) in a master cell group (MCG).

19. The apparatus of claim 17, wherein the primary cell in the same cell group is a primary secondary cell (PSCell) in a secondary cell group (SCG).

20. The apparatus of claim 15, wherein the indication comprises a cell index.

21. The apparatus of claim 15, wherein the instructions are further executable by the processor to cause the apparatus to: The indication is received via a radio resource control message.

22. An apparatus for wireless communication at a first serving cell, comprising: processor; a memory coupled to the processor; as well as instructions stored in the memory and executable by the processor to cause the apparatus to: determining a misalignment between a first system frame number associated with the first serving cell and a second system frame number associated with a second serving cell, wherein the first serving cell and the second serving cell are in communication with a user equipment (UE) via asynchronous carrier aggregation; identifying a selected system frame number for transmission parameter calculation input from the first system frame number and the second system frame number based at least in part on the presence of the misalignment, wherein the instructions are further executable by the processor to cause the apparatus to: transmit an indication that one of the first serving cell or the second serving cell is associated with the selected system frame number, and identify the first system frame number or the second system frame number as the selected system frame number based at least in part on the transmitted indication; calculating a transmission parameter based at least in part on the selected system frame number; and Communicating with the UE is performed based at least in part on the calculated transmission parameters.

23. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to: identifying that one of the first serving cell and the second serving cell is a configured serving cell configured for at least one of semi-persistently scheduled communications or configured granted communications; and The first system frame number or the second system frame number is identified as the selected system frame number based at least in part on one of the first serving cell and the second serving cell being the configured serving cell.

24. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to: identifying that the first serving cell and the second serving cell are part of the same cell group; identifying a primary cell within the same cell cluster; and The first system frame number or the second system frame number is identified as the selected system frame number based at least in part on one of the first serving cell and the second serving cell being the primary cell.

25. The apparatus of claim 24, wherein the primary cell in the same cell group is a primary cell (PCell) in a master cell group (MCG).

26. The apparatus of claim 24, wherein the primary cell in the same cell group is a primary secondary cell (PSCell) in a secondary cell group (SCG).

27. The apparatus of claim 22, wherein the indication comprises a cell index.

28. The apparatus of claim 22, wherein the instructions are further executable by the processor to cause the apparatus to: The indication is transmitted via a radio resource control message.

29. A device for wireless communication, comprising: Apparatus for performing the steps of the method according to any one of claims 1-14.

30. A non-transitory computer readable medium having program code recorded thereon, wherein the program code, when executed by at least one processor, causes the at least one processor to perform the steps of the method of any one of claims 1-14.

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