Power headroom reporting for sidelinks in carrier aggregation configuration

Abstract

Methods, systems, and apparatuses for wireless communication are described. A user equipment (UE) identifies a carrier aggregation configuration for a set of communication links, wherein at least one of the communication links in the set is a side link. The UE determines an event associated with the side link that triggers a power headroom report and transmits a power headroom report based on the determined event associated with the side link that triggers the power headroom report.

Description

[0001] Cross-references

[0002] This patent application claims priority to U.S. Patent Application No. 17 / 467,865, filed September 7, 2021, entitled “POWER HEADROOM REPORT FOR SIDELINKS IN DUAL CONNECTIVITY CONFIGURATION,” filed by He et al., which is a continuation in part of U.S. Patent Application No. 17 / 366,928, filed July 2, 2021, entitled “POWER HEADROOM REPORT FOR SIDELINKS IN DUAL CONNECTIVITY CONFIGURATION,” and claims U.S. Provisional Patent Application No. 63 / 082,387, filed September 23, 2020, entitled “POWER HEADROOM REPORT FOR SIDELINKS IN DUAL CONNECTIVITY CONFIGURATION,” and U.S. Provisional Patent Application No. 63 / 082,387, filed September 23, 2020, entitled “POWER HEADROOM REPORT FOR SIDELINKS IN DUAL CONNECTIVITY,” filed September 21, 2020, entitled “POWER HEADROOM REPORT FOR SIDELINKS IN DUAL CONNECTIVITY.” Priority is claimed in U.S. Provisional Patent Application No. 63 / 081,218, entitled “CONFIGURATION”; each application is assigned to the assignee of this application and is expressly incorporated herein by reference. Technical Field

[0003] The following content relates to wireless communication, including power margin reporting for sidelinks in one or more of dual connectivity or carrier aggregation configurations. Background Technology

[0004] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, and broadcasting. These systems can 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), LTE-A Advanced (LTE-A), or LTE-A Pro systems, and fifth-generation (5G) systems, which may be referred to as New Radio (NR) systems. These systems can employ 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 Extended Orthogonal Frequency Division Multiplexing (DFT-S-OFDM).

[0005] A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each of which simultaneously supports communication from multiple communication devices, also referred to as User Equipment (UE). A UE can be configured to operate on multiple communication links as part of a dual-connectivity configuration. A UE can also be configured to provide a power headroom report, including power headroom information, to the base station, which can use this report to schedule and allocate resources for the UE. For example, a UE can generate power headroom information for multiple communication links. In some cases, the UE may inefficiently provide power headroom information corresponding to one or more communication links. For example, a UE may support an access link with a base station and a side link with another UE. In some cases, the base station may not be aware of the UE's transmit power dedicated to the side link. Therefore, the resources allocated by the base station to the UE may be insufficient to effectively support both the access link and the side link. Therefore, it may be desirable to provide improvements in power headroom information reporting. Summary of the Invention

[0006] The described aspects of the technology relate to configuring a communication device (which may be a UE) to support power headroom reporting regarding access links with base stations (e.g., eNodeB (eNB), giga-NodeB (gNB)) or side links with another UE, or both. To support improvements to power headroom reporting for side links in a dual-connectivity configuration, aspects for providing indications of power headroom information for each side link associated with the UE are described. For example, the UE may communicate with multiple base stations via multiple communication links as part of a dual-connectivity configuration, and the UE may send a power headroom report to each base station, including an indication of power headroom information associated with each communication link.

[0007] The UE can be configured to identify a dual-connectivity configuration for a set of communication links, wherein at least one of the communication links in the set includes a sidelink. In some examples, the UE can determine a sidelink-related event that triggers a power headroom report and transmit power headroom based on the determined sidelink-related event. In some examples, the UE can be configured to determine the sidelink-related event based on identifying the activation of at least one additional sidelink carrier, establishing a relay communication link between the UE and a relay network node, measuring a set of path loss values, determining the minimum path loss value among the measured set of path loss values, or determining the backoff value of one or more sidelink carriers, or any combination thereof. Therefore, the described techniques can include features for improving sidelink operation and, in some examples, can facilitate high-reliability and low-latency sidelink communication, among other benefits.

[0008] Additionally or alternatively, to support improvements to power headroom reporting, the UE can be configured with sidelink-related power headroom reporting triggers. In some examples, the UE can be configured to provide power headroom reporting based on path loss measurements on the sidelink. In some other examples, the UE can be configured to provide power headroom reporting based on the activation of any carrier on the access link (with the base station) or the sidelink (with another UE). Alternatively, the UE can be configured to provide power headroom reporting based on the addition of a new sidelink with an additional UE. In other examples, the UE can be configured to provide power headroom reporting based on the power backoff value of the access link (with the base station) or the sidelink (with another UE). To support power headroom reporting for both access links and sidelinks, the UE can also be configured with a power headroom medium access control-control element (MAC-CE) bitmap that distinguishes carriers across any link using unique indices. By adapting to improvements in power headroom reporting, the UE can experience power savings. Therefore, the described techniques may also include features for improving sidelink operation, and in some examples, may facilitate highly reliable and low-latency sidelink communication, among other benefits. Attached Figure Description

[0009] Figure 1 and Figure 2 An example of a wireless communication system for reporting power margin for a sidelink in one or more of a dual-connectivity configuration or a carrier aggregation configuration, according to aspects of this disclosure, is shown.

[0010] Figure 3A and Figure 3B An example of a sidelink power headroom reporting message for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration supported by aspects of this disclosure is shown.

[0011] Figure 4 An example of a sidelink power headroom reporting message for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration supported by aspects of this disclosure is shown.

[0012] Figure 5 and Figure 6 An example of a process flow for reporting power margin for a side link in one or more of a dual-connectivity configuration or carrier aggregation configuration supported by aspects of this disclosure is shown.

[0013] Figure 7 and Figure 8 A block diagram of a device for reporting power margin for a sidelink in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown.

[0014] Figure 9 A block diagram of a communication manager for reporting power margin for sidelinks in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown.

[0015] Figure 10 A schematic diagram of a system including devices for sidelink power headroom reporting in one or more of a dual-connectivity configuration or a carrier aggregation configuration, according to aspects of this disclosure, is shown.

[0016] Figures 11 to 18 A flowchart is shown of a method for reporting power margin for a sidelink in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure. Detailed Implementation

[0017] Wireless communication systems may include communication devices, such as UEs and base stations (e.g., eNB, gNB, or another base station), that support wireless communication via one or more radio access technologies. Examples of radio access technologies include 4G systems such as LTE systems and 5G systems, which may be referred to as NR systems. For example, wireless communication between a UE and a base station in a wireless communication system can occur on a communication link known as an access link (e.g., a Uu interface). In some cases, a UE may be configured to operate on multiple communication links in a dual-connectivity mode. A UE may use different frequency resources (e.g., subcarriers, carriers) to communicate with two or more cells (e.g., two or more base stations). In some cases, a UE may be associated with a maximum transmit power, and the base station may schedule uplink transmissions for the UE. The base station may indicate the transmit power used for uplink transmissions on a communication link. However, this may not take into account the transmit power of transmissions scheduled on additional communication links.

[0018] Wireless communication systems may additionally or alternatively support sidelink communication between multiple UEs. Examples of sidelink communication may include, but are not limited to, device-to-device (D2D) communication, vehicle-based communication, which may also be referred to as vehicle-to-everything (V2X) communication systems, vehicle-to-vehicle (V2V) communication systems, cellular V2X (C-V2X) communication systems, etc. For example, sidelink communication between at least two UEs in a wireless communication system may occur on a communication link referred to as a sidelink (e.g., a PC5 interface). In some cases, the base station may not be able to consider the transmit power of transmissions scheduled on the sidelink.

[0019] Various aspects of this disclosure provide techniques for reporting power headroom information in the context of multiple communication links, multiple Media Access Control (MAC) entities, multiple cell groups, or multiple base stations. For example, a UE can identify a dual-connectivity configuration of a set of communication links including at least one sidelink, and the UE can be configured for dynamic power sharing between a first subset of communication links terminating at a first network node and a second subset of communication links terminating at a second network node. The UE can determine event triggers associated with that sidelink (e.g., power headroom reporting trigger). In some scenarios, the UE can receive resource allocations on remote links (e.g., mode 1-based resource allocation). For example, a base station can allocate dynamically or configured resources for sidelink transmissions between the UE and a relay node (e.g., a relay UE). Such scenarios can support a Hybrid Automatic Repeat Request (HARQ) procedure between the UE and the relay node.

[0020] In some cases, dual connectivity configurations can support a UE communicating with two or more cells or cell groups at one or more base stations. In some examples, the base stations can support a first cell group (e.g., a primary cell group) and a second cell group (e.g., a secondary cell group), while in other examples, a first base station can support a first cell group, and a second base station can support a second cell group. Dual connectivity configurations can support the UE sending and receiving data from one or more base stations simultaneously, which can reduce system latency. In some cases, the UE can perform dynamic power sharing across the first and second cell groups. For example, the UE can limit or reduce the transmit power used for the first cell group to reserve transmit power for the second cell group. Dynamic power sharing can support the UE managing transmit power across multiple cell groups such that the total transmit power (e.g., the sum of the transmit power used for the first and second cell groups) is below a transmit power threshold (e.g., the maximum transmit power). Dynamic power sharing can support the UE operating according to transmit power thresholds in dual connectivity configurations.

[0021] Event triggering can be based on determined path loss changes, sidelink carrier activation, new relay establishment, timer expiration, power backoff changes, or any combination thereof. The UE can determine one or more event triggers in a dual-connectivity environment and send a sidelink power headroom report based on the determined event triggers. For example, the UE can measure path loss values ​​for multiple communication links, and event triggering can be based on determining the minimum path loss value among the measured path loss values. In some additional or alternative examples, event triggering can be based on the UE identifying the activation of a sidelink carrier. In some cases, the UE can send a power headroom report on multiple communication links. For example, the UE can send a power headroom report to a base station across a first communication link and to a relay across a second communication link, and the relay can forward the power headroom report to the same or different base stations. In some examples, the UE can send a power headroom report to a first relay across a first communication link and to a second relay across a second communication link. The first and second relays can forward the power headroom report to the same or different base stations. The UE can report power margin information for multiple communication links or cell groups, which can improve transmission scheduling efficiency.

[0022] For example, a UE can be configured to report power headroom information for all communication links or cell groups associated with it. For instance, a UE can be associated with multiple communication links, and each communication link can correspond to a cell group. The UE can generate a power headroom report for each communication link, and each power headroom report can include power headroom information for each carrier of the corresponding communication link. A communication link can be associated with one carrier (e.g., non-carrier aggregation (CA)) or multiple carriers (e.g., CA). In some examples, one or more cell groups in a dual-connectivity configuration can also be configured for carrier aggregation. In such cases, the carriers of the cell group are managed by the same MAC entity.

[0023] In some examples, the UE may generate and send a power headroom report based on receiving one or more reference signals from a relay (e.g., another UE) and determining a minimum path loss value based on the received one or more reference signals. Alternatively, the UE may generate and send a power headroom report based on the activation of a sidelink carrier that identifies a communication link or cell group, the establishment of an additional communication link (e.g., a sidelink) with the relay, or the determination of a backoff value for one or more sidelink carriers.

[0024] Multiple communication links may terminate at the same base station, or the UE may not be configured for dynamic power sharing. In such cases, power headroom reports can be sent across multiple communication links, and each power headroom report may include power headroom information corresponding to the cell group associated with the communication link sending the power headroom report. In some cases, the UE may be configured for dynamic power sharing, and multiple communication links may terminate at different base stations. In such cases, each power headroom report may include power headroom information for each cell associated with multiple communication links. For example, each power headroom report may include multiple cell identifiers and bitmaps, and each bitmap may indicate the power headroom value for each carrier of the corresponding cell. In some additional or alternative cases, each power headroom report may include power headroom information for a single cell, and the base station may communicate to determine the power headroom information for all cells associated with the UE.

[0025] Therefore, this disclosure may include features for improving sidelink operation, and in some examples may facilitate high-reliability and low-latency sidelink communication, among other benefits. Aspects of this disclosure are initially described in the context of wireless communication systems. Aspects of this disclosure are then described with reference to sidelink power headroom reporting messages and process flows. Aspects of this disclosure are further shown and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to power headroom reporting for the sidelink in a dual-connectivity configuration.

[0026] Additionally or alternatively, in some examples, the wireless communication system may support relay operation to extend the network coverage of the communication devices. For example, the UE may communicate directly with a base station (e.g., the network operator of the network (e.g., 4G network, 5G network)). Alternatively, the UE may communicate indirectly with the base station through another UE (also referred to as the relay UE). For example, the UE and the base station may not be able to communicate directly because the UE may be outside the coverage area of ​​the base station, thus requiring a relay UE to relay the communication between the UE and the base station. The UE outside the coverage area may be referred to herein as a remote UE. The relay UE will support the relay function by relaying information (e.g., data) for the remote UE using D2D communication (e.g., sidelink communication).

[0027] The relay UE can support relay functionality in various modes. For example, in the first mode (Mode 1), the base station can allocate resources (e.g., dynamic or configured resources) for sidelink communication between the relay UE and the remote UE. Mode 1 can also support a Hybrid Automatic Repeat Request (HARQ) procedure for sidelink communication. Alternatively, in the second mode (Mode 2), the base station may not participate in sidelink communication. In other words, the relay UE and the remote UE autonomously select the time and frequency resources used for sidelink communication.

[0028] To facilitate resource allocation and scheduling, the UE can provide the base station with a power margin report that includes power margin information. The base station can use this power margin report to schedule and allocate time and frequency resources for the UE. The power margin report includes power margin information indicating how much transmit power is available for the UE. As described herein, in some cases, the UE can support wireless communication on various communication links. For example, the UE can support an access link with the base station and a side link with another UE. In these examples, the base station may not be aware of the transmit power the UE dedicates to the side link. Therefore, the time and frequency resources allocated by the base station to the UE may be insufficient to effectively support both the access link and the side link.

[0029] The described aspects of the technology involve configuring a UE to support power headroom reporting regarding an access link with a base station or a side link with another UE, or both. To support enhanced power headroom reporting, the UE can be configured with side link-related power headroom reporting triggers. In some examples, the UE can be configured to provide power headroom reporting based on path loss measurements on the side link. For example, the UE can measure the path loss of a reference signal received from a corresponding UE (e.g., a relay UE) associated with the side link and calculate the minimum measured path loss change for all reference signals received by the corresponding UE. In some other examples, the UE can be configured to provide power headroom reporting based on the activation of any carrier on the access link (with the base station) or the side link (with other UEs).

[0030] The UE can be configured to provide power headroom reporting based on the addition of a new sidelink with an attached UE. In other examples, the UE can be configured to provide power headroom reporting based on power backoff values ​​of either the access link (with the base station) or the sidelink (with another UE). To support power headroom reporting for both access links and sidelinks, the UE can also be configured with a power headroom bitmap that distinguishes carriers across any link using unique indices. By supporting improved power headroom reporting, the UE can experience power savings because it can allocate sufficient time and frequency resources for sidelink communication. Therefore, the described techniques can also include features for improving sidelink operation and, in some examples, can facilitate highly reliable and low-latency sidelink communication, among other benefits.

[0031] The aspects of this disclosure were initially described in the context of wireless communication systems. These aspects are further illustrated and described with reference to apparatus diagrams, system diagrams, and flowcharts relating to power margin reporting for sidelinks in one or more dual-connectivity or carrier aggregation configurations.

[0032] Figure 1An example of a wireless communication system 100 supporting power headroom reporting for sidelinks in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. 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 an LTE network, an LTE-A network, an LTE-A Pro network, or an NR network. In some examples, the wireless communication system 100 may support enhanced broadband communication, ultra-reliable (e.g., mission-critical) communication, low-latency communication, communication with low-cost and low-complexity devices, or any combination thereof.

[0033] Base stations 105 can be distributed throughout a geographical area to form a wireless communication system 100, and can be devices of different forms or with different capabilities. Base stations 105 and UE 115 can communicate wirelessly via one or more communication links 125. Each base station 105 can provide a coverage area 110, on which UE 115 and base station 105 can establish one or more communication links 125. Coverage area 110 can be an example of a geographical area where base station 105 and UE 115 can support signal communication according to one or more radio access technologies.

[0034] UE 115 can be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 can be fixed, mobile, or both at different times. UE 115 can be devices of different forms or with different capabilities. Figure 1 Some example UE 115s are shown in the document. The UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s, base station 105, or network devices (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network devices), such as... Figure 1 As shown.

[0035] Base station 105 may communicate with core network 130, communicate with each other, or both. For example, base station 105 may be connected to core network 130 via one or more backhaul links 120 (e.g., via S1, N2, N3, or other interfaces). Base station 105 may communicate with each other directly (e.g., directly between base stations 105) or indirectly (e.g., via core network 130) or both via backhaul links 120 (e.g., via X2, Xn, or other interfaces). In some examples, backhaul link 120 may be or include one or more radio links. The one or more base stations 105 described herein may include or may be referred to by those skilled in the art as base transceiver, radio base station, access point, radio transceiver, NodeB, eNodeB (eNB), next-generation NodeB or gigabit NodeB (any of which may be referred to as gNB), home NodeB, home eNodeB, or other suitable terms.

[0036] UE 115 may include or be referred to as a mobile device, wireless device, remote device, handheld device, or subscriber device, or any other suitable term, wherein "device" may also be referred to as a cell, station, terminal, or client, etc. UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, personal digital assistant (PDA), tablet computer, laptop computer, or personal computer. In some examples, UE 115 may include or be referred to as a wireless local loop (WLL) station, Internet of Things (IoT) device, Internet of Everything (IoE) device, or machine-type communication (MTC) device, etc., which may be implemented in various objects such as appliances, vehicles, and meters. Figure 1 As shown, the UE 115 described herein is capable of communicating with various types of devices, such as other UE 115s that can sometimes act as relays, as well as base stations 105 and network devices, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations.

[0037] UE 115 and base station 105 can wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term "carrier" can refer to a set of radio frequency spectrum resources with a defined physical layer structure for supporting communication link 125. For example, a carrier for communication link 125 may include a portion of the radio spectrum band (e.g., a bandwidth portion (BWP)) operating according to one or more physical layer channels of 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 coordinating carrier operation, user data, or other signaling. Wireless communication system 100 can use carrier aggregation or multi-carrier operation to support communication with UE 115. Depending on the carrier aggregation configuration, UE 115 can be configured with multiple downlink component carriers and one or more uplink component carriers. Carrier aggregation can be used with frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0038] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have acquisition or control signaling to coordinate 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 Channel Number (EARFCN)) and can be located according to a channel grid for discovery by UE 115. A carrier may operate in standalone mode, where initial acquisition and connection can be performed by UE 115 via the carrier, or in non-standalone mode, where the connection is anchored using different carriers (e.g., the same or different radio access technologies).

[0039] The communication link 125 shown in the wireless communication system 100 may include uplink transmission from UE 115 to base station 105, or downlink transmission from base station 105 to UE 115. A carrier may carry either downlink or uplink communication (e.g., in FDD mode), or may be configured to carry both downlink and uplink communication (e.g., in TDD mode). A carrier may be associated with a bandwidth of the radio spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several defined bandwidths of a carrier for a radio access technology (e.g., 1.4 MHz, 3 MHz, 5 MHz, 10 MHz, 15 MHz, 20 MHz, 40 MHz, or 80 MHz). Devices of the wireless communication system 100 (e.g., base station 105 or UE 115, or both) may have a hardware configuration that supports communication over a carrier bandwidth, or may be configured to support communication over one bandwidth of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or a UE 115, which supports simultaneous communication 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 the carrier bandwidth.

[0040] The signal waveform transmitted via a carrier can consist of multiple subcarriers (e.g., using multi-carrier modulation (MCM) techniques, such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform extended OFDM (DFT-S-OFDM)). In a system employing MCM, a resource element can consist of one symbol period (e.g., the duration of a modulation symbol) and one subcarrier, where the symbol period and 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 decoding rate of the modulation scheme, or both). Therefore, the more resource elements the UE 115 receives and the higher the order of the modulation scheme, the higher the data rate the UE 115 may achieve. Wireless communication resources can refer to a combination of radio frequency spectrum resources, temporal resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers can further increase the data rate or data integrity of communication with the UE 115.

[0041] One or more parameter sets for a carrier can be supported, where the parameter sets may include subcarrier spacing (Δf) and a cyclic prefix. A carrier can be divided into one or more BWPs with the same or different parameter sets. In some examples, UE115 can be configured with multiple BWPs. In some examples, a single BWP of a carrier can be active at a given time, and communication of UE115 can be limited to one or more active BWPs. The time interval of base station 105 or UE 115 can be represented as a multiple of a basic time unit; for example, a basic time unit can refer to T. s =1 / (Δf) max ·N f The sampling period is ) seconds, where Δf max This can represent the maximum supported subcarrier spacing, and N f This can represent the maximum supported Discrete Fourier Transform (DFT) size. The time interval of the communication resource can be organized according to radio frames, each with a specified duration (e.g., 10 milliseconds (ms)). Each radio frame can be identified by a System Frame Number (SFN) (e.g., ranging from 0 to 1023).

[0042] Each frame may include multiple 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 (e.g., in the time domain) into subframes, and each subframe may be further divided into multiple 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 multiple symbol periods (e.g., depending on the length of the cyclic prefix preceding each symbol period). In some wireless communication systems 100, a time slot may be further divided into multiple micro-time slots comprising one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (e.g., N) f (Number) sampling periods. The duration of a symbol period can depend on the subcarrier spacing or the operating frequency band. A subframe, time slot, small time slot, or symbol can be the smallest scheduling unit of the wireless communication system 100 (e.g., in the time domain) and can be referred to as a transmission time interval (TTI). In some examples, the duration of the TTI (e.g., the number of symbol periods in the TTI) can be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communication system 100 can be dynamically selected (e.g., in bursts of short TTIs (sTTIs)).

[0043] Depending on the technology, physical channels can be multiplexed on a carrier. For example, physical control channels and physical data channels can be multiplexed on a downlink carrier using one or more of time-division multiplexing (TDM), frequency-division multiplexing (FDM), or hybrid TDM-FDM technologies. The control region (e.g., control resource set (CORESET)) of a physical control channel can be defined by multiple symbol periods and can be extended across the system bandwidth or a subset of the system bandwidth of the carrier. One or more control regions (e.g., CORESET) can be configured for a group of UEs 115. For example, one or more UEs 115 can monitor or search for control regions for control information based on one or more search space sets, and each search space set can include one or more control channel candidates from one or more aggregation levels arranged in a cascaded manner. The aggregation level of control channel candidates can refer to multiple control channel resources (e.g., control channel elements (CCEs)) associated with coded information in a control information format with a given payload size. The search space set can include a common search space set configured to send control information to multiple UEs 115 and a UE-specific search space set for sending control information to a specific UE 115.

[0044] Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). The term "cell" may refer to a logical communication entity used to communicate with base station 105 (e.g., via a carrier) and may be associated with an identifier used to distinguish neighboring cells (e.g., Physical Cell Identifier (PCID), Virtual Cell Identifier (VCID), etc.). In some examples, a cell may also refer to a geographic coverage area 110 or a portion of geographic coverage area 110 (e.g., a sector) on which a logical communication entity operates. The extent of such a cell can range from a small area (e.g., a structure, a subset of structures) to a large area, depending on various factors such as the capabilities of base station 105. For example, a cell may be or include buildings, subsets of buildings, external spaces between or overlapping geographic coverage areas 110, etc.

[0045] Macro cells cover a relatively large geographical area (e.g., a radius of several kilometers) and can allow unrestricted access for UE 115 with a service subscription to a network provider supporting the macro cell. In contrast, small cells can be associated with a low-power base station 105 and can operate in the same or different (e.g., licensed, unlicensed) frequency bands as macro cells. Small cells can provide unrestricted access to UE 115 with a service subscription to a network provider, or restricted access to UE 115 associated with a small cell (e.g., UE 115 in a Closed Subscriber Group (CSG), or UE 115 associated with a user in a home or office). Base station 105 can support one or more cells and can also support communication on one or more cells using one or more component carriers. In some examples, carriers can support multiple cells and different cells can be configured based on different protocol types that can provide access to different types of devices (e.g., MTC, Narrowband IoT (NB-IoT), Enhanced Mobile Broadband (eMBB)).

[0046] In some examples, base station 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 different geographic coverage areas 110 may be supported by the same base station 105. In other examples, different base stations 105 may support overlapping geographic coverage areas 110 associated with different technologies. For example, wireless communication system 100 may include a heterogeneous network in which different types of base stations 105 use the same or different radio access technologies to provide coverage for various geographic coverage areas 110.

[0047] Wireless communication system 100 can support synchronous or asynchronous operation. For synchronous operation, base stations 105 can have similar frame timing, and transmissions from different base stations 105 can be approximately time-aligned. For asynchronous operation, base stations 105 may have different frame timing, and in some examples, transmissions from different base stations 105 may be time-disaligned. The techniques described herein can be used for both synchronous and asynchronous operation. Some UEs 115, such as MTC devices or IoT devices, can be low-cost or low-complexity devices and can provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC can refer to data communication technologies that allow devices to communicate with each other or with base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices with integrated sensors or meters to measure or capture information and relay that information to a central server or application, which uses the information or presents it to a person interacting with the application. Some UEs 115 can be designed to collect information or enable automated behavior of machines or other devices. Examples of applications for MTC devices include smart metering, inventory monitoring, water level monitoring, equipment monitoring, healthcare monitoring, wildlife monitoring, weather and geological event monitoring, fleet management and tracking, remote security sensing, physical access control, and transaction-based business charging.

[0048] Some UE 115s can be configured to operate in a power-saving mode, such as half-duplex communication (e.g., a mode that supports unidirectional communication via transmission or reception, but not simultaneous transmission and reception). In some examples, half-duplex communication can be performed at a reduced peak rate. Other power-saving techniques for UE 115s include entering a power-saving deep sleep mode when not engaged in active communication, operating on limited bandwidth (e.g., according to narrowband communication), or a combination of these techniques. For example, some UE 115s can be configured to operate using a narrowband protocol type associated with a defined portion or range (e.g., a set of subcarriers or resource blocks (RBs)) within a carrier, within a carrier's guard band, or outside a carrier.

[0049] Wireless communication system 100 can be configured to support ultra-reliable communication or low-latency communication, or various combinations thereof. For example, wireless communication system 100 can be configured to support ultra-reliable low-latency communication (URLLC) or mission-critical communication. UE 115 can be designed to support ultra-reliable, low-latency, or mission-critical functions (e.g., mission-critical functions). Ultra-reliable communication can include private or group communication and can 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 can include prioritizing services that can be used for public safety or general business applications. The terms ultra-reliable, low-latency, mission-critical, and ultra-reliable low-latency are used interchangeably herein.

[0050] In some examples, UE 115 can also communicate directly with other UE 115 via device-to-device (D2D) communication link 135 (e.g., using peer-to-peer (P2P) or D2D protocols). One or more UE 115s using D2D communication can be within the geographic coverage area 110 of base station 105. Other UE 115s in such a group may be outside the geographic coverage area 110 of base station 105 or unable to receive transmissions from base station 105. In some examples, multiple groups of UE 115s communicating via D2D communication can use a one-to-many (1:M) system, where each UE 115 transmits to every other UE 115 in the group. In some examples, base station 105 facilitates resource scheduling for D2D communication. In other cases, D2D communication is performed between UE 115s without the participation of base station 105.

[0051] In some systems, the D2D communication link 135 may be an example of a communication channel (such as a sidelink communication channel) between vehicles (e.g., UE 115). In some examples, vehicles may communicate using vehicle-to-everything (V2X) communication, vehicle-to-vehicle (V2V) communication, or some combination of these communications. Vehicles may signal information related to traffic conditions, signal control, weather, safety, emergencies, or any other information related to the V2X system. In some examples, vehicles in a V2X system may communicate with roadside infrastructure (such as roadside units) using vehicle-to-network (V2N) communication, or with the network via one or more network nodes (e.g., base station 105), or with both.

[0052] UE 115 can provide a power headroom report to base station 105 via the access link. The power headroom report can include power headroom information indicating how much transmit power remains available for UE 115 beyond what is currently used (e.g., by current transmissions). UE 115 can report the power headroom information in a Power Headroom Report MAC-CE, which can be transmitted via an uplink channel such as the Physical Uplink Shared Channel (PUSCH). In some examples, the MAC-CE can include power headroom information for all UE 115s serving a cell with a configured uplink. For each serving cell, the power headroom information can include a calculated power headroom value (e.g., real or virtual) and the maximum transmit power of that serving cell. UE 115 reports the real power headroom value for carriers with actual uplink transmissions (e.g., PUSCH transmissions) and the virtual power headroom value for carriers without uplink transmissions (e.g., no PUSCH transmissions), calculated based on a reference formula. Base station 105 can use the power margin value reported by UE 115 to help determine how to schedule UE 115.

[0053] UE 115 may provide a power headroom report to base station 105 based on a power headroom report trigger associated with the access link between base station 105 and UE 115. When an uplink clearance is received after the power headroom report is triggered, UE 115 sends a power headroom report MAC-CE in the corresponding time slot. The power headroom report trigger may be the expiration of a periodic timer used for the power headroom report. In some examples, the power headroom report trigger may be the power headroom report disable timer not running, and the uplink path loss of UE 115 changing beyond a configured threshold. In some other examples, the power headroom report trigger may be the configuration or reconfiguration of the power headroom reporting function by one or more upper layers of the protocol stack associated with UE 115. In other examples, the power headroom report trigger may also be the activation of the uplink in any of the secondary cell configurations in UE 115's MAC entity. Alternatively, the power headroom report trigger may be the addition of a primary / secondary cell (e.g., a newly added or changed primary / secondary cell) as part of a dual connectivity configuration. In some examples, a power margin report trigger can be triggered when the power margin report disable timer does not run, or when power backoff due to cell power management has changed beyond a configured threshold since the last transmission of the power margin report.

[0054] The described aspects of the technology relate to configuring UE 115 to support power headroom reporting with respect to an access link with base station 105 (e.g., an eNodeB (eNB), giga-NodeB (gNB)), or a side link with another UE 115, or both. To support enhanced power headroom reporting, UE 115 may be configured with side link-related power headroom reporting triggers. A power headroom report associated with a side link may be referred to as a side link power headroom report. In some examples, UE 115 may be configured to provide power headroom reporting based on path loss measurements on the side link. For example, UE 115 may measure the path loss of a reference signal received from a corresponding UE 115 (e.g., a relay UE 115) associated with the side link and calculate the minimum measured path loss change for all reference signals received by the corresponding UE 115. In some other examples, UE 115 may be configured to provide power headroom reporting based on the activation of any carrier on the access link (with the base station) or the side link (with other UE 115).

[0055] Alternatively, UE 115 can be configured to provide power headroom reporting based on the addition of a new sidelink and an additional UE 115. In other examples, UE 115 can be configured to provide power headroom reporting based on power backoff values ​​of either the access link (with base station 105) or the sidelink (with another UE 115). To support power headroom reporting for both access links and sidelinks, the UE can also be configured with a power headroom MAC-CE bitmap that distinguishes carriers on any link using unique indices. By supporting improved power headroom reporting, UE 115 can experience power savings because it can allocate sufficient time and frequency resources for sidelink communication. Therefore, the described techniques can also include features for improving sidelink operation and, in some examples, can facilitate high-reliability and low-latency sidelink communication, among other benefits.

[0056] Core network 130 can provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. Core network 130 can be an evolved packet core (EPC) or a 5G core (5GC), and can include at least one control plane entity (e.g., a mobility management entity (MME), access and mobility management function (AMF)) managing access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), packet data network (PDN) gateway (P-GW), or user plane function (UPF)) routing packets or interconnects to external networks. The control plane entity can manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management of UE 115 served by base station 105 associated with core network 130. User IP packets can be transmitted through the user plane entity, which can provide IP address allocation and other functions. The user plane entity can connect to one or more network operator IP services 150. IP services 150 can include access to the Internet, intranets, IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0057] Some network devices, such as base station 105, may include sub-components, such as access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with UE 115 through one or more other access network transport entities 145, which may be referred to as a radio head, smart radio head, or transmit / receive point (TRP). 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 combined into a single network device (e.g., base station 105).

[0058] Wireless communication system 100 can operate using one or more frequency bands in the range of 300 MHz to 300 GHz. The region from 300 MHz to 3 GHz is referred to as the Ultra High Frequency (UHF) region or decimeter band because the wavelength range is from approximately 1 decimeter to 1 meter. UHF waves may be blocked or deflected by buildings and environmental features, but the waves can penetrate structures sufficiently to enable macrocells to provide service to UE 115 located indoors. Compared to transmissions using smaller frequencies and longer waves in the High Frequency (HF) or Very High Frequency (VHF) portions of the spectrum below 300 MHz, UHF wave transmissions can be associated with smaller antennas and shorter distances (e.g., less than 100 km).

[0059] The wireless communication system 100 can also operate in the ultra-high frequency (SHF) region using a frequency band from 3 GHz to 30 GHz (also known as the centimeter band), or in the extremely high frequency (EHF) region of the spectrum (e.g., from 30 GHz to 300 GHz) (also known as the millimeter band). In some examples, the wireless communication system 100 can support millimeter-wave (mmW) communication between the UE 115 and the base station 105, and the EHF antennas of the corresponding devices can be smaller and more closely spaced than UHF antennas. In some examples, this can facilitate the use of antenna arrays within the device. However, compared to SHF or UHF transmissions, EHF transmissions may experience greater atmospheric attenuation and therefore shorter propagation distances. The techniques disclosed herein can be employed in transmissions using one or more different frequency regions, and the designated use of frequency bands in these frequency regions may vary by country or regulatory body.

[0060] Wireless communication system 100 can use licensed and unlicensed radio spectrum bands. For example, wireless communication system 100 can employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in unlicensed bands such as the 5 GHz Industrial, Scientific, and Medical (ISM) band. When operating in unlicensed radio spectrum bands, devices such as base station 105 and UE 115 can employ carrier sensing for collision detection and avoidance. In some examples, operation in unlicensed bands can be based on carrier aggregation configurations that combine component carriers operating in licensed bands (e.g., LAA). Operation in unlicensed spectrum can include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, etc.

[0061] Base station 105 or UE 115 may be equipped with multiple antennas that can be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communication, or beamforming. The antennas of base station 105 or UE 115 may be located within one or more antenna arrays or antenna panels that can support MIMO operation or transmit or receive beamforming. For example, one or more base station antennas or antenna arrays may be located together at an antenna assembly, such as an antenna tower. In some examples, the antennas or antenna arrays associated with base station 105 may be located in different geographical locations. Base station 105 may have an antenna array with multiple rows and columns of antenna ports that base station 105 can use to support beamforming for communication with UE 115. Similarly, UE 115 may have one or more antenna arrays that can support various MIMO or beamforming operations. Additionally or alternatively, antenna panels may support radio frequency beamforming of signals transmitted via antenna ports.

[0062] 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 a technique can be called spatial multiplexing. For example, multiple signals can be transmitted by a transmitting device via different antennas or different combinations of antennas. Similarly, a receiving device can receive multiple signals via different antennas or different combinations of antennas. Each of the multiple signals can be referred to as a separate spatial stream and can carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). Different spatial layers can be associated with different antenna ports used for channel measurement and reporting. MIMO techniques include: single-user MIMO (SU-MIMO), where multiple spatial layers are transmitted to the same receiving device; and multi-user MIMO (MU-MIMO), where multiple spatial layers are transmitted to multiple devices.

[0063] Beamforming, also known as spatial filtering, directional transmission, or directional reception, is a signal processing technique used at transmitting or receiving devices (e.g., base station 105, UE 115) to shape or manipulate antenna beams (e.g., transmit or receive beams) along a spatial path between the transmitting and receiving devices. Beamforming can be achieved by combining signals transmitted via antenna elements of an antenna array, such that some signals propagating in a direction relative to the antenna array experience constructive interference, while others experience destructive interference. The adjustment of signals transmitted via antenna elements can include the transmitting or receiving device applying amplitude offset, phase offset, or both to the signals transmitted via the antenna elements associated with the device. The adjustment associated with each antenna element can be defined by a beamforming weight set associated with a direction (e.g., relative to the antenna array of the transmitting or receiving device, or relative to some other direction).

[0064] Base station 105 or UE 115 may use beam scanning technology as part of beamforming operations. For example, base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform beamforming operations for directional communication with UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted multiple times by base station 105 in different directions. For example, base station 105 may transmit signals according to different beamforming weight sets associated with different transmission directions. Transmissions in different beam directions may be used to identify (e.g., by a transmitting device such as base station 105, or by a receiving device such as UE 115) the beam direction for later transmission or reception by base station 105.

[0065] Some signals, such as data signals associated with a receiving device, may be transmitted by base station 105 in a single beam direction (e.g., the direction associated with the receiving device, such as UE 115). In some examples, the beam direction associated with transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, UE 115 may receive one or more signals transmitted by base station 105 in different directions and may report to base station 105 an indication that UE 115 has received signals with the highest signal quality or other acceptable signal quality.

[0066] In some examples, transmission by a device (e.g., base station 105 or UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or radio frequency beamforming to generate a combined beam for transmission (e.g., from base station 105 to UE 115). UE 115 may report feedback indicating precoding weights for one or more beam directions, and this feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. Base station 105 may transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)), which may be precoded or uncoded. UE 115 may provide feedback for beam selection, which may be a precoded matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel codebook, linear combination codebook, port selection codebook). Although these techniques are described with reference to signals transmitted by base station 105 in one or more directions, UE 115 may employ similar techniques to transmit signals multiple times in different directions (e.g., to identify the beam direction that UE 115 subsequently transmits or receives), or to transmit signals in a single direction (e.g., to transmit data to a receiving device).

[0067] When receiving various signals (such as synchronization signals, reference signals, beam selection signals, or other control signals) from base station 105, the receiving device (e.g., UE 115) can attempt multiple receiving configurations (e.g., directional listening). For example, the receiving device can attempt multiple receiving directions by receiving via different antenna subarrays, by processing the received signal according to different antenna subarrays, by receiving according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array (e.g., different sets of directional listening weights), or by processing the received signal according to different sets of receiving beamforming weights applied to signals received at multiple antenna elements of the antenna array. Any of these different receiving configurations or directions can be referred to as "listening." In some examples, the receiving device can use a single receiving configuration to receive along a single beam direction (e.g., when receiving data signals). The single receiving configuration can be aligned based on beam directions determined by listening according to different receiving configuration directions (e.g., a beam direction determined based on listening to multiple beam directions to have the highest signal strength, highest signal-to-noise ratio (SNR), or other acceptable signal quality).

[0068] The wireless communication system 100 can be a packet-based network operating according to a layered protocol stack. In the user plane, communication at the bearer layer or Packet Data Convergence Protocol (PDCP) layer can be IP-based. The Radio Link Control (RLC) layer can perform packet segmentation and reassembly for communication on logical channels. The MAC layer can perform priority processing and multiplex logical channels into transport channels. The MAC layer can also use error detection, error correction, or both to support MAC layer retransmissions to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer can provide the establishment, configuration, and maintenance of RRC connections between the UE 115 and the base station 105 or core network 130 that supports user plane data radio bearers. At the physical layer, transport channels can be mapped to physical channels.

[0069] UE 115 and base station 105 can support data retransmission to increase the likelihood of successful data reception. Hybrid Automatic Repeat Request (HARQ) feedback is a technique to increase the likelihood of data being correctly received through communication link 125. HARQ can 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)). Under adverse radio conditions (e.g., low signal-to-noise ratio conditions), HARQ can improve the throughput of the MAC layer. In some examples, the device can support simultaneous time-slot HARQ feedback, where the device can provide HARQ feedback in a specific time slot for data received in the previous symbol within that time slot. In other cases, the device can provide HARQ feedback in subsequent time slots or according to other time intervals.

[0070] UE 115 can identify a dual-connectivity configuration of a set of communication links, wherein at least one of the communication links in the set includes a sidelink. UE 115 can determine sidelink-related events that trigger a power headroom report and send a power headroom report based on the determined sidelink-related events. In some cases, UE 115 can determine sidelink-related events based on identifying the activation of at least one additional sidelink carrier, establishing a relay communication link between UE 115 and a relay network node (e.g., another UE 115), measuring a set of path loss values, determining the minimum path loss value among the measured set of path loss values, determining the backoff value of one or more sidelink carriers, or any combination thereof.

[0071] Figure 2 An example of a wireless communication system 200 supporting sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. Wireless communication system 200 may implement aspects of wireless communication system 100. For example, wireless communication system 200 may include base stations 105-a, 105-b and UEs 115-a, 115-b, which may be references... Figure 1 Examples of base station 105 and UE 115 are described. Wireless communication system 200 can support various radio access technologies, including 4G systems such as LTE, LTE-A, or LTE-A Pro, and 5G systems, which may be referred to as NR systems. Wireless communication system 200 may include features for improved power saving, and in some examples, can facilitate highly reliable and low-latency sidelink communication, among other benefits.

[0072] exist Figure 2In the example, each base station 105a-a, 105-b may be associated with multiple cells and coverage areas 110, and UE 115-a (e.g., a remote UE) may communicate with base stations 105-a, 105-b via one or more communication links 205. UE 115-a may be within the coverage area 110-a of base station 105-a and within the coverage area 110-b of base station 105-b. In some other cases, UE 115-a may be within the coverage area 110-a of base station 105-a and outside the coverage area 110-b of base station 105-b. UE 115-a may be associated with a set of communication links (e.g., communication link 205-a, communication link 205-b, communication link 205-c, and / or communication link 205-d). The first subset of this set of communication links may include communication link 205-a corresponding to a direct communication link (e.g., a Uu link, a Uu interface), and the second subset of this set of communication links may include communication link 205-b corresponding to a side link (e.g., a PC5 link, a PC5 interface, a remote link). Additionally, the second subset of this set of communication links may include communication links (e.g., relay communication links) terminating at base station 105-a or base station 105-b. For example, communication link 205-c may terminate at base station 105-a, and communication link 205-d may terminate at base station 105-b. Communication link 205 may be associated with one or more carriers.

[0073] The wireless communication system 200 may illustrate techniques for reporting power headroom information in the context of a dual-connectivity configuration. For example, UE 115 may report power headroom information to base station 105 based on measured path loss values ​​of multiple cells or cell groups. Additionally or alternatively, UE 115 may report power headroom information to base station 105 based on the activation of an identifier-side link carrier or cell. UE 115 can report power headroom information across multiple links or cells, which can improve resource scheduling efficiency.

[0074] UE 115-a can determine the triggering of a sidelink power headroom report associated with a sidelink (e.g., communication link 205-a). The sidelink power headroom report triggering can be based on the satisfaction of one or more conditions. In some examples, the sidelink power headroom report triggering can be based on the expiration of a periodic timer. In some cases, UE 115-a can be configured with a periodic timer as part of a control procedure (e.g., an RRC procedure), and the control procedure can indicate the duration of the periodic timer. In some examples, the sidelink power headroom report triggering can be based on UE 115-a receiving one or more path loss reference signals from UE 115-b (e.g., a relay UE), measuring one or more path loss reference signals, and determining the minimum path loss value of the measured one or more path loss reference signals. In some examples, communication link 205-b can be associated with a carrier aggregation configuration, and the sidelink power headroom report triggering can be based on the activation of an additional carrier associated with communication link 205-b. In some examples, sidelink power headroom reporting can be triggered based on a disabled timer (e.g., based on the expiration of a disabled timer, based on the disabled timer not running, etc.) and a power backoff change greater than a threshold since the last transmission of the sidelink power headroom report.

[0075] In some examples, the wireless communication system 200 can support power sharing across multiple communication links 205. For example, the transmit power of UE 115-a can be dynamically shared. The transmit power of UE 115-a can dynamically span communication links 205-a and 205-b. In some cases, UE 115-a can reduce the transmit power of communication link 205-a to reserve transmit power for communication link 205-b. Dynamically sharing transmit power across multiple communication links, cells, or base stations can support simultaneous uplink and downlink communication. In some examples, sidelink power margin reporting can be triggered based on the establishment of a new relay device (e.g., a new UE 115) or the activation of a new sidelink carrier associated with any relay device associated with UE 115-a. In some cases, the transmit power of UE 115-a may not be dynamically shared, and sidelink power margin reporting can be triggered based on the establishment of a new relay device.

[0076] UE 115-a can determine the power margin values ​​of communication link 205-a and communication link 205-b. In some cases, the power margin value of a side link (e.g., communication link 205-b) can be determined in the same manner as the power margin value of a direct link (e.g., communication link 205-a). When the side link associated with UE 115-a is configured in carrier aggregation mode, when UE 115-a determines the physical side link shared channel (PSSCH) resource in which the power margin report MAC control element (CE) will be transmitted, UE 115-a can determine whether to report the actual or virtual power margin value of the carrier of the side link. For example, in the first time slot (e.g., time slot "N"), UE 115-a can determine that the subsequent time slot (e.g., time slot "N+K") corresponds to the first available PSSCH for transmitting the power margin report MAC-CE. During the first time slot, UE 115-a can determine whether to report the actual or virtual power headroom value of the carrier (e.g., carrier "C"). The actual power headroom value can be calculated based on one or more uplink messages (e.g., PUSCH) transmitted on the channel, and the virtual headroom value can be calculated based on a reference formula for the channel. In some cases, the actual power headroom corresponds to the actual power of the channel, and the virtual power headroom corresponds to the estimated power of the channel. UE 115-a can determine whether to report the actual or virtual power headroom value based on available scheduling information and whether there will be PSSCH transmission on the carrier in subsequent time slots. When the sidelink associated with UE 115-a is not configured in carrier aggregation mode, UE 115-a can report the actual power headroom value of the sidelink's carrier.

[0077] Considering the power currently used for transmission, the power margin value reported for the sidelink can indicate the amount of available transmit power for UE 115-a. Each cell group can be associated with a periodic power margin report timer and a power margin report disable timer. Communication link 205 can be associated with a cell group, and the timer associated with the cell group can be reset after the power margin report MAC-CE is transmitted in the cell group. The timer for the cell group can be unaffected by the transmission of power margin report MAC-CEs in different cell groups. Therefore, wireless communication system 200 can include features for improving sidelink operation, and in some examples, can facilitate high reliability and low latency sidelink communication, among other benefits.

[0078] Alternatively or additionally, each base station 105 may provide a coverage area 110 on which a corresponding UE 115 and a corresponding base station 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographical region on which the corresponding base station 105 and the corresponding UE 115 may support communication of information (e.g., control information, data) based on one or more radio access technologies. Each base station 105 may provide communication coverage via one or more cells (e.g., macro cells, small cells, hotspots, or other types of cells, or any combination thereof). For example, the coverage area 110 may correspond to one or more cells.

[0079] UE 115-a may be within the coverage area 110-a of base station 105-a and within the coverage area 110-b of base station 105-b. In some other cases, UE 115-a may be within the coverage area 110-a of base station 105-a and outside the coverage area 110-b of base station 105-b. UE 115-a may be associated with one or more communication links (e.g., communication link 205-a, communication link 205-b, communication link 205-c, and / or communication link 205-d), which may be associated with one or more carriers. For example, communication link 205-a may correspond to a direct communication link (e.g., a Uu link, a Uu interface), and another communication link 205-b may correspond to a side link (e.g., a PC5 link, a PC5 interface, a remote link). In some examples, UE 115-b may support one or more additional communication links (e.g., relay communication links) terminating at base station 105-a or base station 105-b. For example, communication link 205-c can terminate at base station 105-a, and communication link 205-d can terminate at base station 105-b.

[0080] UE 115-a or UE 115-b, or both, can be configured to support various levels of carrier aggregation. In some examples, UE 115-a or UE 115-b, or both, can support aggregation between communication links 205 of UE 115 (e.g., Uu communication links and PC5 communication links). For example, UE 115-a may be outside coverage and has multiple relays (e.g., PC5 communication links). All these relays may be connected to the same corresponding base station 105 (e.g., base station 105-a or base station 105-b). Alternatively, UE 115-a may be within coverage and has both Uu communication links and PC5 communication links. Both the Uu communication links and PC5 communication links may be connected to the same corresponding base station 105 (e.g., base station 105-a or base station 105-b). In some other examples, UE 115-a or UE 115-b, or both, can support aggregation between carriers on communication links 205. Each communication link 205 (e.g., a Uu communication link or a PC5 communication link) may or may not be configured with multiple carriers. Carriers on the same communication link may be managed by the same MAC entity of UE115-a or UE115-b.

[0081] UE 115-a can be configured to support power headroom reporting for access links with the corresponding base station 105 (e.g., eNodeB (eNB), giga-NodeB (gNB)) or side links with the corresponding UE 115, or both. To support improvements to power headroom reporting, UE 115-a can be configured to trigger power headroom reporting associated with a side link (e.g., communication link 205-b). Power headroom reports associated with a side link can be referred to as side link power headroom reports. In some examples, UE 115-a can be configured to provide power headroom reports based on path loss measurements on the side link (e.g., communication link 205-b). For example, UE 115-a can measure the path loss of a reference signal received from a UE 115-b (e.g., relay UE 115) associated with the side link (e.g., communication link 205-b), and calculate the minimum measured path loss variation for all reference signals received by UE 115-a.

[0082] In some other examples, UE 115-a can be configured to provide power headroom reporting based on the activation of any carrier on the access link with the corresponding base station 105 (e.g., base station 105-a) or on the side link with UE 115-b (e.g., communication link 205-b). Alternatively, UE 115-a can be configured to provide power headroom reporting based on the addition of a new side link and the additional UE 115. In other examples, UE 115-a can be configured to provide power headroom reporting based on the power backoff value of the access link with the corresponding base station 105 (e.g., base station 105-a) or on the side link with UE 115-b (e.g., communication link 205-b).

[0083] UE 115-a can be configured to determine whether to report the actual or virtual power headroom value of the carrier when it determines a resource on which the Power Headroom Report MAC-CE can be transmitted. This resource can reside on the Physical Side Link Shared Channel (PSSCH) or the PUSCH. For example, in a first time slot (e.g., time slot "N"), UE 115-a can determine that a subsequent time slot (e.g., time slot "n+k") corresponds to the first available PSSCH for transmitting the Power Headroom Report MAC-CE. During the first time slot, UE 115-a can determine whether to report the actual or virtual power headroom value of the carrier. UE 115-a can determine whether to report the actual or virtual power headroom value based on available scheduling information and whether there will be PSSCH transmission on the carrier in a subsequent time slot. When the side link associated with UE 115-a (e.g., communication link 205-b) is not configured in carrier aggregation mode, UE 115-a can report the actual power margin value of the side link's carrier. The power margin value reported for side link transmissions is defined as how much transmit power is available for UE 115-a in addition to the power used by the current PSSCH transmission.

[0084] In some examples, if UE 115-a (e.g., a remote UE) has both a Uu communication link and a PC5 communication link, and the network has been configured with a Logical Channel Priority (LCP) limiting policy, UE 115-a can determine, based on the LCP limiting policy, to send a Power Margin Report MAC-CE on a specific type of communication link (e.g., only on Uu). In other words, depending on the first available resource on any communication link 205, the type and power margin value determination remain the same. However, based on the LCP limiting policy, the transmission of the Power Margin MAC-CE has been restricted to a specific communication link 205.

[0085] To support power headroom reporting for both access links and sidelinks, UE 115-a can also be configured with a power headroom MAC-CE bitmap, which distinguishes carriers on any link using unique indices. By supporting improved power headroom reporting, UE 115 can experience power savings because it can allocate sufficient time and frequency resources for sidelink communication. Therefore, the described techniques can also include features for improving sidelink operation and, in some examples, can facilitate high-reliability and low-latency sidelink communication, among other benefits.

[0086] Figure 3A and Figure 3B Examples of sidelink power headroom reporting messages 301 and 302 supporting sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure are shown. In some examples, sidelink power headroom messages 301 and 302 may be implemented as follows: Figure 1 and Figure 2 Aspects of the wireless communication system 100 and wireless communication system 200 are shown. Operations associated with sidelink power margin messages 301, 302 can be implemented by the UE 115 or its components, as described herein.

[0087] Sidelink power headroom message 301 can be transmitted on a sidelink with a single carrier (e.g., without carrier aggregation), while sidelink power headroom message 302 can be transmitted on a sidelink with multiple carriers (e.g., carrier aggregation). UE 115 can transmit sidelink power headroom message 301 on a sidelink including a single carrier. Sidelink power headroom message 301 may include multiple reserved bit fields 305, a power headroom value field 310, and a maximum transmit power field 315. The first eight bits of sidelink power headroom message 301 may include reserved bit 305-a, reserved bit 305-b, and power headroom value 310-a. Power headroom value 310-a may indicate the power headroom value corresponding to the communication link (e.g., cell group, MAC entity) on which sidelink power headroom message 301 is transmitted. In some cases, sidelink power headroom message 301 may be transmitted in a sidelink power headroom report MAC-CE.

[0088] UE 115 can transmit a sidelink power margin message 302 on a sidelink that includes multiple carriers. The sidelink power margin message 302 may include multiple reserved bit fields 305, multiple power margin value fields 310, multiple maximum transmit power fields 315, multiple carrier bit fields 320, multiple flag fields 325, and multiple flag fields 330. The first eight bits of the sidelink power margin message 301 may include reserved bits 305-e and a bitmap that includes the carrier bit field 310. For example, if UE 115 has both Uu and PC5 communication links, then the carriers of UE 115 on any communication link can have a unique index (e.g., a carrier index). Thus, if a remote UE 115 has both a Uu link and a PC5 link, the base station 105 ensures that all carriers of the remote UE 115 on any link have a unique index. The bitmap of the sidelink power headroom message 302 includes seven carrier fields 310 (e.g., carrier bits 320-a, 320-b, 320-c, 320-d, 320-e, 320-f, and 320-g). However, it should be understood that the number of carrier fields can be varied to match the number of carriers associated with the communication link (e.g., cell group, MAC entity) on which the sidelink power headroom message 302 is transmitted. Each carrier field 320 can indicate whether the power headroom information for the corresponding carrier is included in the sidelink power headroom message 302, and the length of the bitmap can correspond to the number of carriers associated with the communication link. In some cases, multiple reserved bit fields 305 can be used to ensure that the bitmap is byte-aligned.

[0089] In some examples, UE 115 may send a sidelink power headroom report message based on a sidelink power headroom report trigger. For example, if UE 115 is configured without dynamic power sharing or multiple relays associated with the same base station, and UE 115 determines that the sidelink power headroom report trigger condition has been met, then UE 115 may send one or more sidelink power headroom report messages. Sidelink power headroom report message 301 may be sent on a sidelink with a single carrier (e.g., without CA configured), and sidelink power headroom report message 302 may be sent on a sidelink with multiple carriers (e.g., with CA configured).

[0090] UE 115 can transmit a sidelink power headroom report message 301 on a sidelink comprising a single carrier. The sidelink power headroom report message 301 may include multiple reserved bit fields 305, a power headroom value field 310, and a maximum transmit power field 315. The first eight bits of the sidelink power headroom report message 301 may include reserved bits 305-a, reserved bits 305-b, and a power headroom value 310-a. The power headroom value 310-a may indicate the power headroom value corresponding to the link (e.g., cell group, MAC entity) on which the sidelink power headroom report message 301 is transmitted. In some cases, the sidelink power headroom report message 301 may be transmitted in a sidelink power headroom report MAC-CE.

[0091] UE 115 may transmit a sidelink power headroom report message 302 on a sidelink that includes multiple carriers. The sidelink power headroom report message 302 may include multiple reserved bit fields 305, multiple power headroom value fields 310, multiple maximum transmit power fields 315, multiple carrier bit fields 320, multiple flag fields 325, and multiple flag fields 330. The first eight bits of the sidelink power headroom report message 302 may include reserved bits 305-e and a bitmap that includes the carrier bit fields 310. The bitmap of the sidelink power headroom report message 302 includes seven carrier fields 310 (e.g., carrier bits 320-a, 320-b, 320-c, 320-d, 320-e, 320-f, and 320-g), but it should be understood that the number of carrier fields may be varied to match the number of carriers associated with the link (e.g., cell group, MAC entity) on which the sidelink power headroom report message 302 is transmitted. Each carrier field 320 can indicate whether the power headroom information of the corresponding carrier is included in the sidelink power headroom report message 302, and the length of the bitmap can correspond to the number of carriers associated with the link. In some cases, multiple reserved bit fields 305 can be used to ensure that the bitmap is byte-aligned.

[0092] Flag field 325 can indicate whether the maximum transmit power of a carrier is included in the sidelink power headroom report message 302. For example, flag field 325-a can indicate whether the maximum transmit power of a first carrier (e.g., carrier 320-a) is included in the sidelink power headroom report message 302. In some cases, flag field 325 can be set if the corresponding power headroom value (e.g., the corresponding power headroom value field 310) is real. Flag field 330 can indicate whether the power headroom value of a carrier is dummy. For example, flag field 330-a can indicate whether the power headroom value of a first carrier (e.g., carrier 320-a) is dummy. In some cases, if flag field 330 (e.g., flag field 330-a) indicates that the power headroom value field (e.g., power headroom value field 310-b) is dummy, then the corresponding maximum transmit power field (e.g., maximum transmit power field 315-b) may not be included in the sidelink power headroom report message 302. In some cases, the Sidelink Power Headroom Report Message 301 can be sent as a Sidelink Power Headroom Report MAC-CE.

[0093] Figure 4 Examples of a sidelink power headroom reporting message 400 supporting sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure are shown. In some examples, the sidelink power headroom reporting message 400 may implement aspects of wireless communication system 100 or wireless communication system 200. The operations associated with the sidelink power headroom reporting message 400 may be implemented by UE 115 or its components as described herein.

[0094] UE 115 can send a sidelink power headroom report message based on a sidelink power headroom report trigger. For example, if UE 115 is configured with dynamic power sharing and multiple relays associated with different base stations, and UE 115 determines that the sidelink power headroom report trigger condition has been met, then UE 115 can send one or more sidelink power headroom report messages. The sidelink power headroom report message 400 can be sent on a sidelink with a single carrier (e.g., without CA configured) or on a sidelink with multiple carriers (e.g., with CA configured). In some cases, UE 115 can send the sidelink power headroom report message 400 on each sidelink associated with UE 115, and each sidelink power headroom report message 400 can include power headroom information corresponding to the carrier associated with the sidelink on which the power headroom report message 400 is sent. In such a scenario, different base stations associated with UE 115 can communicate (e.g., via a backhaul link) to allocate resources to UE 115 (e.g., the base stations can coordinate the carrier index of UE 115, the transmit power of UE 115, the transmission mode of UE, etc.).

[0095] In some cases, UE 115 may send a sidelink power headroom report message 400, which includes power headroom information for each link (e.g., cell group, MAC entity) associated with UE 115. UE 115 may send the sidelink power headroom report message 400 on one or more sidelinks. Some sidelinks may include multiple carriers, while some sidelinks may include a single carrier. The sidelink power headroom report message 400 may include multiple reserved bit fields 405, multiple cell ID fields 410, multiple power headroom value fields 415, multiple maximum transmit power fields 420, multiple carrier bit fields 425, multiple flag fields 430, and multiple flag fields 435. The first eight bits of the sidelink power headroom report message 400 may include reserved bits 405-a, 405-b, and a cell ID field 410-a, where cell ID field 410-a indicates the cell associated with UE 115 for the base station. The number of cell ID fields 410 included in the sidelink power headroom report message 400 can correspond to the number of cell groups associated with UE 115. The sidelink power headroom report message 400 can include power headroom information for each cell group associated with UE 115.

[0096] The sidelink power headroom report message 400 may include multiple bitmaps, each corresponding to a cell group. Each bitmap may include multiple carrier bit fields 425. For example, a bitmap corresponding to a cell group identified in the cell ID field 410-a may include seven carrier bit fields 425 (e.g., carrier bit fields 425-a, 425-b, 425-c, 425-d, 425-e, 425-f, and 425-g). However, it should be understood that the number of carrier fields may be varied to match the number of carriers associated with the corresponding cell group. Each carrier bit field 425 may indicate whether the power headroom information for the corresponding carrier is included in the sidelink power headroom report message 400. In some cases, multiple reserved bit fields 405 may be used to ensure that the bitmap is byte-aligned.

[0097] Each cell group indicated in the sidelink power margin report message 400 may include multiple power margin value fields 415 corresponding to the number of carriers in the corresponding cell group, multiple maximum transmit power fields 420 corresponding to the number of carriers in the corresponding cell group, multiple flag fields 430 corresponding to the number of carriers in the corresponding cell group, and multiple flag fields 435 corresponding to the number of carriers in the corresponding cell group.

[0098] Flag field 430 can indicate whether the maximum transmit power of a carrier is included in the sidelink power headroom report message 400. For example, flag field 430-b can indicate whether the maximum transmit power of a carrier (e.g., carrier 410-a) of a cell group (e.g., the cell group indicated in cell ID field 410-b) is included in the sidelink power headroom report message 400. In some cases, flag field 430 can be set if the corresponding power headroom value (e.g., the corresponding power headroom value field 415) is real. Flag field 435 can indicate whether the power headroom value of a carrier is dummy. For example, flag field 435-b can indicate whether the power headroom value of a carrier (e.g., carrier 410-h) is dummy. In some cases, if flag field 435 (e.g., flag field 435-b) indicates that the power headroom value field (e.g., power headroom value field 415-b) is dummy, then the corresponding maximum transmit power field (e.g., maximum transmit power field 420-b) may not be included in the sidelink power headroom report message 400. In some cases, the sidelink power headroom report message 400 may be sent as a sidelink power headroom report MAC-CE.

[0099] UE 115 can be configured without dynamic power sharing. In this case, UE 115 can transmit a sidelink power headroom report message 400 via a relay, which triggers the transmission of the sidelink power headroom report message 400. The sidelink power headroom report message 400 may include power headroom information for the carrier corresponding to the MAC entity that triggered the power headroom report. In some additional or alternative scenarios, UE 115 may be configured with dynamic power sharing. The sidelink power headroom report message 400 may include power headroom information for all sidelink carriers associated with the UE. Based on when UE 115 determines when a resource (e.g., a first PSSCH resource) becomes available, UE 115 may determine a real or virtual power headroom value for the carrier (e.g., power headroom value field 415). Following this resource and before assembling a MAC protocol data unit (PDU) that includes a power headroom report MAC-CE (e.g., sidelink power headroom report message 400), any additional available uplink resources may not change the type (e.g., real type, virtual type) of the power headroom value reported to the relay.

[0100] In some examples, UE 115 may be associated with (e.g., communicate with) multiple relays at different base stations. In such an example, UE 115 may send a sidelink power headroom report message 400 through each relay associated with UE 115. For example, if the first relay triggers a power headroom information report, UE 115 may send a sidelink power headroom report message 400 to both the first and second relays. Based on sending the sidelink power headroom report message to the corresponding relay, a power headroom report timer (e.g., a disable timer) associated with each relay may be started or restarted.

[0101] In some other examples, UE 115 may be associated with multiple relays associated with a base station. In such examples, UE 115 may send a single sidelink power headroom report message 400 to a relay. The sidelink power headroom report message 400 may be sent to the relay that provides the first available resource (e.g., the first available PSSCH). In some cases, the base station may configure UE 115 with a policy (e.g., a Logical Channel Priority (LCP) restriction policy) that restricts the transmission of messages (e.g., MAC-CE) through the indicated relay. In such cases, UE 115 may prohibit the transmission of the sidelink power headroom report message 400 through the indicated relay. The transmission of the sidelink power headroom report message 400 may be triggered for each relay, but once the sidelink power headroom report message has been sent to a relay, the transmission of sidelink power headroom report messages to other relays may be canceled. Sending sidelink power headroom report messages that include power headroom information for multiple cell groups can enable the base station to efficiently allocate resources to the UE, which can reduce latency and improve system performance.

[0102] Figure 5 An example of process flow 500 supporting sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. Process flow 500 can be implemented with reference to the following references: Figure 1 and Figure 2 Aspects of the described wireless communication systems 100 and 200 are described. Process flow 500 can be based on the configuration of base station 105-c and implemented by UEs 115-c and 115-d to improve network efficiency and reduce latency by providing power margin reports on multiple sidelinks, thereby promoting power savings for UEs 115-c and 115-d. Process flow 500 can also be based on the configuration of base station 105-c and implemented by UEs 115c and 115d to promote highly reliable and low-latency sidelink communication, among other benefits.

[0103] In the following description of process flow 500, operations between base station 105-c and UEs 115-c and 115-d may be transmitted in a different order than the example order shown, or operations performed by base station 105-c and UEs 115-c and 115-d may be performed in a different order or at different times. Some operations may also be omitted from process flow 500, and other operations may be added to process flow 500. Base station 105-c and UEs 115-c and 115-d may be referenced separately. Figure 1 and Figure 2 Examples of base station 105 and UE 115 are described.

[0104] At 505, UE 115-c can identify a dual-connectivity configuration of a set of communication links. In some cases, at least one of the communication links in this set may include a sidelink. At 510, UE 115-a can determine an event trigger associated with this sidelink (e.g., a power headroom report trigger). In some cases, the event trigger may trigger a power headroom report. In other cases, the event trigger may be based on identifying the activation of at least one additional sidelink carrier, establishing an additional sidelink, or determining a minimum path loss value.

[0105] At 515, UE 115-c can send a power headroom report based on a determined event associated with the sidelink. At 520, a relay device such as UE 115-d can forward or send a power headroom report to base station 105-c. In some cases, UE 115-c can receive one or more reference signals at 525. UE 115-c can measure a set of path loss values ​​based on one or more reference signals and determine the minimum path loss value among the measured path loss values. In some cases, event triggering can be based on the determined minimum path loss value.

[0106] Figure 6 An example of process flow 600 supporting sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. Process flow 600 can be implemented with reference to the following references: Figure 1 and Figure 2 Aspects of the described wireless communication systems 100 and 200 are described. Process flow 600 can be based on the configuration of base station 105-d and implemented by UEs 115-d and 115-e to facilitate power savings for UEs 115-d and 115-e by providing power margin reports based on events that trigger power margin reports. Process flow 600 can also be based on the configuration of base station 105-c and implemented by UEs 115c and 115d to facilitate highly reliable and low-latency sidelink communication, among other benefits.

[0107] In the following description of process flow 600, operations between base station 105-d and UEs 115-d and 115-e may be transmitted in a different order than the example order shown, or operations performed by base station 105-d and UEs 115-d and 115-e may be performed in a different order or at different times. Some operations may also be omitted from process flow 600, and other operations may be added to process flow 600. Base station 105-d and UEs 115-d and 115-e may be referenced separately. Figure 1 and Figure 2 Examples of base station 105 and UE 115 are described.

[0108] At position 605, UE 115-d can identify carrier aggregation configurations. For example, UE 115-d can identify configurations such as... Figure 1 and Figure 2 The diagram illustrates a carrier aggregation configuration for a set of communication links. In some examples, at least one communication link in this set includes, for example, a side link between UE 115-d and UE 115-e. In some other examples, at least one communication link in this set includes, for example, an access link between UE 115-d and base station 105-d, an access link between UE 115-e and base station 105-d, or both. Therefore, the side link and access link associated with UE 115-e may terminate at base station 105-d (e.g., the same network node).

[0109] UE 115-d can be based on, respectively, as Figure 3A and Figure 3B The carrier aggregation configuration shown determines a set of carriers associated with a sidelink. Each carrier in this set can share the same MAC entity. In some examples, each carrier in this set corresponds to a specific index in the bitmap of the Power Headroom Report MAC-CE. UE 115-e can identify each carrier based on the corresponding index and associate each carrier with a corresponding communication link in this set of communication links.

[0110] At 610, UE 115-d can determine the event that triggers a power headroom report. In some examples, UE 115-d can measure a set of path loss values ​​in part based on one or more reference signals and trigger a power headroom report based on the measured set of path loss values. For example, UE 115-d can determine the minimum path loss value among the measured path loss values ​​and trigger a power headroom report based on the minimum path loss value. In some other examples, UE 115-d can determine the activation of a carrier on a side link associated with UE 115-e or an access link associated with base station 105-d, or both, and trigger a power headroom report based on the activated carrier. In other examples, UE 115-d can establish, for example, an additional side link associated with another UE 115 (not shown) and trigger a power headroom report based on the established additional side link. Alternatively or additionally, UE 115-d may determine a power backoff value associated with UE 115-e or an access link associated with base station 105-d, or both, and trigger a power margin report based on that power backoff value.

[0111] At 615, UE 115-d may send a power headroom report to UE 115-e via a sidelink. At 620, for example, when UE 115-e is a relay UE, UE 115-d may optionally send a power headroom report to base station 105-d via an access link or via UE 115-e. In some examples, UE 115-d may send a power headroom report to UE 115-e or base station 105-d or both in a power headroom report MAC-CE based on an LCP-limiting policy. The power headroom report may include power headroom information for each active carrier on the sidelink, or power headroom information for each active carrier on a configured uplink with an access link, or both.

[0112] Figure 7 A block diagram 700 illustrates a device 705 supporting sidelink power headroom reporting in one or more dual-connectivity or carrier aggregation configurations according to aspects of this disclosure. Device 705 may be an example of an aspect of UE 115 as described herein. Device 705 may include a receiver 710, a communications manager 715, and a transmitter 720. Device 705 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0113] Receiver 710 can receive information associated with various information channels (e.g., control channels, data channels, and information related to sidelink power headroom reporting in a dual-connectivity configuration), such as packets, user data, or control information. This information can be passed to other components of device 705. Receiver 710 can serve as a reference. Figure 10 Examples of aspects of the transceiver 1020 described. The receiver 710 can use a single antenna or a set of antennas.

[0114] Communication manager 515 may be implemented as an integrated circuit or chipset of device 505, and receiver 510 and transmitter 520 may be implemented as analog components (e.g., amplifiers, filters, antennas) coupled to a modem of device 505 to enable wireless transmission and reception. The actions performed by communication manager 515 as described herein may be implemented to achieve one or more potential advantages. For example, communication manager 715 may identify a dual-connectivity configuration of a set of communication links, wherein at least one of the communication links in the set includes a side link. Communication manager 715 may send a report based on an event associated with the side link that triggers a report, the report including power headroom information of the side link. Additionally or alternatively, communication manager 715 may identify a carrier aggregation configuration of a set of communication links, wherein at least one of the communication links in the set includes a side link; determine an event associated with the side link that triggers a power headroom report; and send a power headroom report based on the determined event associated with the side link that triggers the power headroom report. Communication manager 715 may be an example of an aspect of communication manager 1010 described herein.

[0115] The communication manager 715 or its sub-components may be implemented in hardware, processor-executable code (e.g., software or firmware), or any combination thereof. If implemented in processor-executable code, the functionality of the communication manager 715 or its sub-components may be performed by a general-purpose processor, DSP, application-specific integrated circuit (ASIC), FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described in this disclosure.

[0116] The communication manager 715 or its subcomponents may be physically located in various locations, including being distributed such that some functions are implemented by one or more physical components at different physical locations. In some examples, according to various aspects of this disclosure, the communication manager 715 or its subcomponents may be separate and distinct components. In some examples, according to various aspects of this disclosure, the communication manager 715 or its subcomponents may be combined with one or more other hardware components, including but not limited to input / output (I / O) components, transceivers, network servers, another computing device, one or more other components described in this disclosure, or combinations thereof.

[0117] Transmitter 720 can transmit signals generated by other components of device 705. In some examples, transmitter 720 can be co-located with receiver 710 in transceiver components. For example, transmitter 720 can be a reference. Figure 10 Examples of aspects of the transceiver 1020 described. The transmitter 720 can use a single antenna or a set of antennas.

[0118] Figure 8A block diagram 800 of a device 805 supporting sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. Device 805 may be an example of aspects of device 705 or UE 115 described herein. Device 805 may include receiver 810, communication manager 815, and transmitter 840. Device 805 may also include a processor. Each of these components may communicate with each other (e.g., via one or more buses).

[0119] Receiver 810 can receive information associated with various information channels (e.g., control channels, data channels, and information related to sidelink power headroom reporting in a dual-connectivity configuration), such as packets, user data, or control information. This information can be passed to other components of device 805. Receiver 810 can serve as a reference. Figure 10 Examples of aspects of the transceiver 1020 described. The receiver 810 can use a single antenna or a set of antennas.

[0120] Communication manager 815 may be an example of an aspect of communication manager 715 described herein. Communication manager 815 may include configuration component 820, reporting component 825, carrier component 830, and event component 835. Communication manager 815 may be an example of an aspect of communication manager 1010 described herein. Configuration component 820 may identify a dual-connectivity configuration of a group of communication links, wherein at least one of the communication links in the group includes a side link. Reporting component 825 may send a report based on an event associated with a side link that triggers the report, the report including power headroom information of the side link. Additionally or alternatively, carrier component 830 may identify a carrier aggregation configuration of a group of communication links, wherein at least one of the communication links in the group includes a side link. Event component 835 may determine an event associated with a side link that triggers a power headroom report. Reporting component 825 may send a power headroom report based on the determined event associated with the side link that triggers the power headroom report.

[0121] Transmitter 840 can transmit signals generated by other components of device 805. In some examples, transmitter 840 can be co-located with receiver 810 in a transceiver assembly. For example, transmitter 840 can be a reference... Figure 10 Examples of aspects of the transceiver 1020 are described. The transmitter 840 can use a single antenna or a set of antennas.

[0122] Figure 9A block diagram 900 of a communication manager 905 supporting sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. The communication manager 905 may be an example of aspects of the communication manager 715, communication manager 815, or communication manager 1010 described herein. The communication manager 905 may include a configuration component 910, a carrier component 915, an event component 920, a reporting component 925, a path loss component 930, a sidelink component 935, a power component 940, and a resource component 945. Each of these components may communicate directly or indirectly with each other (e.g., via one or more buses).

[0123] Configuration component 910 can identify a dual-connectivity configuration of a group of communication links, wherein at least one of the communication links in the group includes a sidelink. Event component 920 can determine an event associated with the sidelink that triggers a report. In some examples, event component 920 can identify the activation of at least one additional sidelink carrier associated with one of the communication links in the group. In some examples, event component 920 can determine the event associated with the sidelink that triggers a report based on the activation of at least one additional sidelink carrier. In some other examples, reporting component 925 can send a report based on the activation of at least one additional sidelink carrier. In some examples, event component 920 can establish a relay communication link between the UE and a relay network node. In some examples, event component 920 can determine the event associated with the sidelink that triggers a report based on the establishment of the relay communication link. In some other examples, reporting component 925 can send a report based on the establishment of the relay communication link.

[0124] Event component 920 can receive a set of reference signals via one or more sidelink carriers associated with the sidelink. In some examples, event component 920 can measure a set of path loss values ​​based on the set of reference signals received on one or more sidelink carriers associated with the sidelink. In some examples, event component 920 can determine a sidelink-associated event that triggers a report based on the measured set of path loss values. In some other examples, reporting component 925 can send a report based on the measured set of path loss values.

[0125] In some examples, event component 920 may determine the minimum path loss value from a set of measured path loss values. In some examples, event component 920 may determine, based on the minimum path loss value, an event associated with the sidelink that triggers a power headroom report. In some examples, event component 920 may determine the power backoff value of one or more sidelink carriers associated with the sidelink. In some examples, event component 920 may determine, based on the power backoff value of one or more sidelink carriers associated with the sidelink, an event associated with the sidelink that triggers a report. In some other examples, reporting component 925 may send a report based on the power backoff value of one or more sidelink carriers associated with the sidelink.

[0126] Reporting component 925 can send a report based on a sidelink-related event that triggers the report. In some examples, reporting component 925 can determine the available resources for sending the report based on the sidelink. In some examples, reporting component 925 can determine whether to include actual or virtual power headroom information of the sidelink carrier in the report based on the available resources. In some examples, reporting component 925 can send a power headroom report MAC-CE via the sidelink based on a sidelink-related event that triggers the report, and the report includes the power headroom report MAC-CE.

[0127] Reporting component 925 can send a power headroom report MAC-CE regardless of whether the sidelinks and access links of the group of communication links terminate at the same base station. In some examples, reporting component 925 can send a first power headroom report MAC-CE via a first communication link in the group of communication links, based on the UE being configured for dynamic power sharing between at least two communication links. In some examples, reporting component 925 can send a second power headroom report MAC-CE via a second communication link in the group of communication links, based on the UE being configured for dynamic power sharing between the at least two communication links. In some examples, reporting component 925 can send a power headroom report MAC-CE individually on each of the at least two communication links.

[0128] Reporting component 925 can transmit a single power headroom report MAC-CE via at least one of the communication links in the group of communication links, the at least one communication link including a side link or access link based on the available resources of the at least one communication link. In some examples, reporting component 925 can transmit the power headroom report MAC-CE via at least one of the communication links in the group of communication links based on an LCP throttling policy. In some examples, reporting component 925 can transmit the report based on a report sent on at least one of the communication links in the group of communication links to terminate a triggering event on at least one other communication link in the group of communication links. In some cases, the report includes a power headroom report MAC-CE that includes power headroom information for all carriers associated with the side link. In some cases, the report includes a power headroom report MAC-CE that includes power headroom information dedicated to the side link carrier in which the report was triggered.

[0129] The Power Headroom Report MAC-CE includes a bitmap identifying each sidelink carrier associated with a sidelink. In some cases, the size of the bitmap is equal to the total number of sidelink carriers configured for the sidelink. In some cases, the bitmap includes a carrier identifier associated with the corresponding communication link in the group of communication links, or a cell identifier of the corresponding base station, or both. In some cases, the first Power Headroom Report MAC-CE includes first power headroom information, and the second Power Headroom Report MAC-CE includes second power headroom information, and the first power headroom information is the same as the second power headroom information or the first power headroom information is different from the second power headroom information.

[0130] Power component 940 can determine dynamic power sharing between a first subset of the set of communication links terminating at a first network node and a second subset of the set of communication links terminating at a second network node. In some cases, the UE is configured for dynamic power sharing between the first subset of the set of communication links terminating at the first network node and the second subset of the set of communication links terminating at the second network node.

[0131] Carrier component 915 can identify a carrier aggregation configuration of a group of communication links, wherein at least one of the communication links in the group includes a side link. In some examples, carrier component 915 can determine a group of carriers associated with a side link based on the carrier aggregation configuration, wherein each carrier in the group shares the same Media Access Control entity. In some cases, at least one communication link in the group includes an access link. In some cases, the access link and the side link associated with the relay UE associated with the access link terminate at the same network node. In some cases, each carrier in the group corresponds to a corresponding index in the bitmap of the Power Headroom Report MAC-CE, which identifies each carrier and associates each carrier with a corresponding communication link in the group. In some cases, the group of communication links shares the same MAC entity.

[0132] Event component 920 can determine the sidelink-related event that triggers the power headroom report. Reporting component 925 can send a power headroom report based on the determined sidelink-related event that triggers the power headroom report. In some examples, reporting component 925 can send the power headroom report MAC-CE via the sidelink or the access link based on an LCP limiting policy. In some cases, the power headroom report includes power headroom information for each active carrier on the sidelink, or power headroom information for each active carrier on a configured uplink with an access link, or both.

[0133] The path loss component 930 can receive a set of reference signals from the relay UE via a side link. In some examples, the path loss component 930 can measure a set of path loss values ​​based on the received set of reference signals, wherein determining the side link-related event that triggers a power headroom report is based on the measured set of path loss values. In some examples, the path loss component 930 can determine the minimum path loss value among the measured path loss values, wherein determining the side link-related event that triggers a power headroom report is based on determining the minimum path loss value.

[0134] Sidelink component 935 can determine the activation of a carrier on a sidelink or access link within the group of communication links, wherein determining the sidelink-related event that triggers a power headroom report is based on determining the activation of a carrier on the sidelink or access link. In some examples, sidelink component 935 can establish an additional sidelink, wherein determining the sidelink-related event that triggers a power headroom report is based on establishing the additional sidelink.

[0135] Power component 940 can determine the power backoff value associated with a side link or access link in the group of communication links, wherein determining the event associated with the side link that triggers a power headroom report is based on determining the power backoff value associated with the side link or access link. Resource component 945 can determine the available resources for sending the power headroom report, wherein sending the power headroom report includes sending a power headroom report MAC-CE on the PSSCH or PUSCH based on determining the available resources.

[0136] Figure 10 A schematic diagram of a system 1000, including device 1005 supporting power margin reporting for sidelinks in one or more of a dual-connectivity configuration or carrier aggregation configuration, is shown according to aspects of this disclosure. Device 1005 may be an example of device 705, device 805, or UE 115 described herein, or include components thereof. Device 1005 may include components for bidirectional voice and data communication, including components for transmitting and receiving communications, including a communication manager 1010, an I / O controller 1015, a transceiver 1020, an antenna 1025, a memory 1030, and a processor 1040. These components may communicate electronically via one or more buses (e.g., bus 1045).

[0137] Communication manager 1010 can identify a dual-connectivity configuration of a group of communication links, wherein at least one of the communication links in the group includes a side link, and sends a report based on an event associated with the side link that triggers the report, the report including power headroom information of the side link. Additionally or alternatively, communication manager 1010 can support side links in a carrier aggregation configuration, and communication manager 1010 can provide power headroom reports for the side links in the carrier aggregation configuration. For example, communication manager 1010 can identify a carrier aggregation configuration of a group of communication links, wherein at least one of the communication links in the group includes a side link. Communication manager 1010 can determine an event associated with the side link that triggers the power headroom report, and send the power headroom report based on the determined event associated with the side link that triggers the power headroom report.

[0138] I / O controller 1015 can manage the input and output signals of device 1005. I / O controller 1015 can also manage peripheral devices not integrated into device 1005. In some cases, I / O controller 1015 can represent a physical connection or port to an external peripheral device. In some cases, I / O controller 1015 can use an operating system, such as... Or another known operating system. In other cases, the I / O controller 1015 may represent or interact with a modem, keyboard, mouse, touchscreen, or similar device. In some cases, the I / O controller 1015 may be implemented as part of a processor. In some cases, a user may interact with the device 1005 via the I / O controller 1015 or via hardware components controlled by the I / O controller 1015.

[0139] As described above, transceiver 1020 can communicate bidirectionally via one or more antennas, wired or wireless links. For example, transceiver 1020 can represent a wireless transceiver and can communicate bidirectionally with another wireless transceiver. Transceiver 1020 may also include a modem to modulate packets and provide the modulated packets to the antenna for transmission, and demodulate packets received from the antenna. In some cases, device 905 may include a single antenna 1025. However, in some cases, device 905 may have multiple antennas 1025, which are capable of transmitting or receiving multiple wireless transmissions simultaneously.

[0140] Memory 1030 may include RAM and ROM. Memory 1030 may store computer-readable, computer-executable code 1035, including instructions that, when executed, cause processor 940 to perform the various functions described herein. In some cases, memory 1030 may include a BIOS, which can control basic hardware or software operations, such as interaction with peripheral components or devices.

[0141] Code 1035 may include instructions for implementing aspects of this disclosure, including instructions for supporting wireless communication. Code 1035 may be stored in a non-transitory computer-readable medium, such as system memory or other types of memory. In some cases, code 1035 may not be directly executable by processor 1040, but may enable a computer (e.g., when compiled and executed) to perform the functions described herein.

[0142] Processor 1040 may include intelligent hardware devices (e.g., general-purpose processors, DSPs, CPUs, microcontrollers, ASICs, FPGAs, programmable logic devices, discrete gate or transistor logic components, discrete hardware components, or any combination thereof). In some cases, processor 1040 may be configured to use a memory controller to operate a memory array. In other cases, the memory controller may be integrated into processor 1040. Processor 1040 may be configured to execute computer-readable instructions stored in memory (e.g., memory 1030) to cause device 1005 to perform various functions (e.g., a function or task supporting sidelink power headroom reporting in a dual-connectivity configuration).

[0143] Figure 11A flowchart illustrating method 1100 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1100 can be implemented by the UE or its components. For example, operation of method 1100 can be performed by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0144] At point 1105, the UE can identify a dual-connectivity configuration for a set of communication links, wherein at least one of the communication links in the set includes a side link. Operation of point 1105 can be performed according to the methods described herein. In some examples, aspects of operation of point 1105 can be derived from references... Figures 7 to 10 The configuration components described are used for execution.

[0145] At 1110, the UE can send a report based on a sidelink-related event that triggers the report, which includes sidelink power margin information. The operation of 1110 can be performed according to the methods described herein. In some examples, aspects of the operation of 1110 can be derived from references... Figures 7 to 10 The described reporting component is used to perform this.

[0146] Figure 12 A flowchart illustrating method 1200 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1200 can be implemented by the UE or its components. For example, operation of method 1200 can be provided by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0147] At point 1205, the UE can identify a dual-connectivity configuration for a set of communication links, wherein at least one of the communication links in the set includes a side link. Operation of point 1205 can be performed according to the methods described herein. In some examples, aspects of operation of point 1205 can be derived from references... Figures 7 to 10 The configuration components described are used for execution.

[0148] At 1210, the UE can identify the activation of at least one additional sidelink carrier associated with one of the communication links in the group. The operation of 1210 can be performed according to the method described herein. In some examples, aspects of the operation of 1210 can be derived from references... Figures 7 to 10 The described event component is used to execute.

[0149] At point 1215, the UE can determine the sidelink-related event that triggers the report based on the activation of at least one additional sidelink carrier. The operation of point 1215 can be performed according to the method described herein. In some examples, aspects of the operation of point 1215 can be derived from references... Figures 7 to 10 The described event component is used to execute.

[0150] At point 1220, the UE can send a report based on a sidelink-related event that triggered the report. The operation of point 1220 can be performed according to the method described herein. In some examples, aspects of the operation of point 1220 can be derived from references. Figures 7 to 10 The described reporting component is used to perform this.

[0151] Figure 13 A flowchart illustrating method 1300 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1300 can be implemented by the UE or its components. For example, operation of method 1300 can be provided by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0152] At point 1305, the UE can identify a dual-connectivity configuration for a set of communication links, wherein at least one of the communication links in the set includes a side link. Operation of point 1305 can be performed according to the methods described herein. In some examples, aspects of operation of point 1305 can be derived from references... Figures 7 to 10 The configuration components described are used for execution.

[0153] At 1310, the UE can receive a set of reference signals via one or more sidelink carriers associated with the sidelink. The operation of 1310 can be performed according to the method described herein. In some examples, aspects of the operation of 1310 can be determined by the reference... Figures 7 to 10 The described event component is used to execute.

[0154] At 1315, the UE can measure a set of path loss values ​​based on a set of reference signals received on one or more sidelink carriers associated with the sidelink. The operation of 1315 can be performed according to the method described herein. In some examples, aspects of the operation of 1315 can be determined by reference... Figures 7 to 10 The described event component is used to execute.

[0155] At 1320, the UE can determine the sidelink-related event that triggers the report based on a set of measured path loss values. The operation of 1320 can be performed according to the method described herein. In some examples, aspects of the operation of 1320 can be derived from references... Figures 7 to 10 The described event component is used to execute.

[0156] At point 1325, the UE can send a report based on a sidelink-related event that triggers the report. The operation at point 1325 can be performed according to the method described herein. In some examples, aspects of the operation at point 1325 can be derived from references... Figures 7 to 10 The described reporting component is used to perform this.

[0157] Figure 14 A flowchart illustrating method 1400 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1400 can be implemented by UE 115 or its components. For example, operation of method 1400 can be provided by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0158] At point 1405, the UE may identify a carrier aggregation configuration for a set of communication links, wherein at least one of the communication links in the set includes a side link. Operation at point 1405 can be performed according to the methods described herein. In some examples, aspects of operation at point 1405 may be derived from references... Figures 7 to 10 The carrier component described is used to perform this.

[0159] At point 1410, the UE can determine the side-link-related event that triggers the power headroom report. The operation at point 1410 can be performed according to the methods described herein. In some examples, aspects of the operation at point 1410 can be derived from references... Figures 7 to 10 The described event component is used to execute.

[0160] At point 1415, the UE can send a power headroom report based on a determined side-link-related event that triggers the power headroom report. The operation at point 1415 can be performed according to the method described herein. In some examples, aspects of the operation at point 1415 can be derived from references... Figures 7 to 10 The described reporting component is used to perform this.

[0161] Figure 15A flowchart illustrating method 1500 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1500 can be implemented by UE 115 or its components. For example, operation of method 1500 can be provided by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0162] At point 1505, the UE can identify a carrier aggregation configuration for a set of communication links, wherein at least one of the communication links in the set includes a side link. Operation at point 1505 can be performed according to the methods described herein. In some examples, aspects of operation at point 1505 can be derived from references... Figures 7 to 10 The carrier component described is used to perform this.

[0163] At 1510, the UE can receive a set of reference signals from the relay UE via a side link. The operation of 1510 can be performed according to the method described herein. In some examples, aspects of the operation of 1510 can be determined by the reference... Figures 7 to 10 The described path loss component is used for execution.

[0164] At point 1515, the UE can measure a set of path loss values ​​based on a set of received reference signals. The operation of point 1515 can be performed according to the method described herein. In some examples, aspects of the operation of point 1515 can be determined by reference... Figures 7 to 10 The described path loss component is used for execution.

[0165] At point 1520, the UE can send a power margin report based on a set of path loss values ​​according to the policy. The operation at point 1520 can be performed according to the method described herein. In some examples, aspects of the operation at point 1520 can be derived from references. Figures 7 to 10 The described reporting component is used to perform this.

[0166] Figure 16 A flowchart illustrating method 1600 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1600 can be implemented by UE 115 or its components. For example, operation of method 1600 can be provided by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0167] At point 1605, the UE may identify a carrier aggregation configuration for a set of communication links, wherein at least one of the communication links in the set includes a side link. Operation at point 1605 can be performed according to the method described herein. In some examples, aspects of operation at point 1605 may be derived from references... Figures 7 to 10 The carrier component described is used to perform this.

[0168] At point 1610, the UE can determine the activation of a carrier on a side link or access link within the group of communication links. The operation at point 1610 can be performed according to the method described herein. In some examples, aspects of the operation at point 1610 can be derived from references... Figures 7 to 10 The sidelink components described are used to perform this.

[0169] At point 1615, the UE can send a power headroom report based on the activation of a carrier on the determined side link or access link. The operation of point 1615 can be performed according to the method described herein. In some examples, aspects of the operation of point 1615 can be derived from references... Figures 7 to 10 The described reporting component is used to perform this.

[0170] Figure 17 A flowchart illustrating method 1700 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1700 can be implemented by UE 115 or its components. For example, operation of method 1700 can be provided by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0171] At point 1705, the UE can identify a carrier aggregation configuration for a group of communication links, wherein at least one of the communication links in the group includes a side link. Operation at point 1705 can be performed according to the methods described herein. In some examples, aspects of operation at point 1705 can be derived from references... Figures 7 to 10 The carrier component described is used to perform this.

[0172] At 1710, the UE can establish an additional side link. Operation of 1710 can be performed according to the methods described herein. In some examples, aspects of operation of 1710 can be derived from references. Figures 7 to 10 The sidelink components described are used to perform this.

[0173] At point 1715, the UE can send a power headroom report based on the establishment of an additional sidelink. The operation of point 1715 can be performed according to the method described herein. In some examples, aspects of the operation of point 1715 can be derived from references... Figures 7 to 10 The described reporting component is used to perform this.

[0174] Figure 18 A flowchart illustrating method 1800 for sidelink power headroom reporting in one or more of a dual-connectivity configuration or carrier aggregation configuration according to aspects of this disclosure is shown. As described herein, operation of method 1800 can be implemented by the UE or its components. For example, operation of method 1800 can be provided by reference to... Figures 7 to 10 The described communication manager is used to perform these functions. In some examples, the UE can execute a set of instructions to control the UE's functional elements to perform the functions described below. Additionally or alternatively, the UE can use dedicated hardware to perform aspects of the functions described below.

[0175] At point 1805, the UE can identify a carrier aggregation configuration for a set of communication links, wherein at least one of the communication links in the set includes a side link. Operation at point 1805 can be performed according to the methods described herein. In some examples, aspects of operation at point 1805 can be derived from references... Figures 7 to 10 The carrier component described is used to perform this.

[0176] At 1810, the UE can determine the power backoff value associated with a side link or access link in this group of communication links. The operation of 1810 can be performed according to the method described herein. In some examples, aspects of the operation of 1810 can be derived from references... Figures 7 to 10 The power components described are used to perform this.

[0177] At point 1815, the UE can send a power headroom report based on a determined power backoff value associated with the sidelink or access link. The operation of point 1815 can be performed according to the method described herein. In some examples, aspects of the operation of point 1815 can be derived from references... Figures 7 to 10 The described reporting component is used to perform this.

[0178] It should be noted that the methods described herein depict possible implementations, and the operations and steps can be rearranged or otherwise modified, and other implementations are also possible. Furthermore, aspects of two or more methods can be combined.

[0179] While aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described for illustrative purposes, and the terms LTE, LTE-A, LTE-A Pro, or NR may be used in most of the description, the techniques described herein can be applied beyond LTE, LTE-A, LTE-A Pro, or NR networks. For example, the described techniques can be applied to a variety of other wireless communication systems, such as Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0180] The information and signals described herein can be represented using any of a variety of different technologies and processes. For example, data, instructions, commands, information, signals, bits, symbols, and chips referenced throughout the description can be represented by voltage, current, electromagnetic waves, magnetic fields or particles, light fields or particles, or any combination thereof.

[0181] The following examples are given for illustrative purposes. Aspects of the following examples may be combined with aspects or embodiments shown or discussed with respect to the accompanying drawings or elsewhere herein.

[0182] Example 1 is a method for wireless communication at a UE, the method comprising: identifying a dual connectivity configuration for multiple communication links, wherein at least one of the multiple communication links includes a side link; and sending a report, including power margin information of the side link, based at least in part on an event associated with the side link that triggers a report.

[0183] Example 2 of the method according to Example 1 further includes identifying the activation of at least one additional sidelink carrier associated with a communication link in a plurality of communication links, wherein the transmission report is based at least in part on the activation of at least one additional sidelink carrier.

[0184] Example 3, based on the method of Example 1 or 2, further includes establishing a relay communication link between the UE and a relay network node, wherein sending reports is based at least in part on establishing the relay communication link.

[0185] Example 4 of the method according to any of Examples 1 to 3 further includes receiving a set of reference signals via one or more sidelink carriers associated with the sidelink; and measuring a set of path loss values ​​based at least in part on the set of reference signals received on one or more sidelink carriers associated with the sidelink, wherein the transmission report is based at least in part on the measured set of path loss values.

[0186] Example 5, based on the method of Example 4, further includes determining the minimum path loss value among a set of measured path loss values, wherein the report is sent based at least in part on the minimum path loss value.

[0187] Example 6 of the method according to any of Examples 1 to 5 further includes determining a power backoff value for one or more sidelink carriers associated with the sidelink, wherein the transmission report is based at least in part on the power backoff value of one or more sidelink carriers associated with the sidelink.

[0188] Example 7, based on the method of any of Examples 1 to 6, further includes determining the available resources for sending reports based at least in part on the side link, wherein sending reports includes sending a power margin report MAC-CE on the PSSCH based at least in part on the available resources.

[0189] Example 8, based on the method of Example 7, further includes determining, at least in part, the actual or virtual power margin information for including sidelink carriers in the report based on available resources.

[0190] Example 9 of the method according to Example 7, wherein the power headroom report includes a power headroom report MAC-CE, which includes power headroom information for all carriers associated with the side link.

[0191] According to Example 10 of the method in Example 7, the report includes a power headroom report MAC-CE, which includes power headroom information dedicated to the sidelink carrier in which the report is triggered.

[0192] Example 11 of the method according to any of Examples 1 to 10, wherein the power margin report MAC-CE includes a bitmap identifying each sidelink carrier associated with the sidelink.

[0193] Example 12 of the method of Example 11, wherein the size of the bitmap is equal to the total number of sidelink carriers configured for the sidelink.

[0194] Example 13 of the method according to Example 11, wherein the bitmap includes a carrier identifier or a cell identifier of a corresponding base station associated with a corresponding communication link in a plurality of communication links, or both.

[0195] Example 14 of the method according to any of Examples 1 to 13 further includes sending a power headroom report MAC-CE via the side link, at least in part based on an event associated with the side link that triggers the report. The report includes the power headroom report MAC-CE.

[0196] Example 15 of the method according to Example 14, wherein the transmit power margin report MAC-CE is independent of the side links in multiple communication links and the access links in multiple communication links terminating at the same base station.

[0197] Example 16 of the method according to any one of Examples 1 to 15 further includes transmitting a first power margin report MAC-CE via a first communication link of a plurality of communication links, based at least in part on the UE being configured for dynamic power sharing between at least two communication links, and transmitting a second power margin report MAC-CE via a second communication link of a plurality of communication links, based at least in part on the UE being configured for dynamic power sharing between at least two communication links.

[0198] Example 17 of the method according to Example 16, wherein the first power margin report MAC-CE includes first power margin information, and the second power margin report MAC-CE includes second power margin information, and the first power margin information is the same as the second power margin information or the first power margin information is different from the second power margin information.

[0199] Example 18 of the method according to Example 16 also includes sending a power margin report MAC-CE separately on each of the at least two communication links.

[0200] Example 19 of the method according to any of Examples 1 to 18 further includes transmitting a single power margin report MAC-CE via at least one of a plurality of communication links, the at least one communication link including a side link or access link that is at least partially based on the available resources of the at least one communication link.

[0201] Example 20 of the method according to Example 19 also includes transmitting a power margin report MAC-CE via at least one of a plurality of communication links, at least in part based on an LCP limiting strategy.

[0202] Example 21 of the method according to any of Examples 1 to 20 further includes terminating the report sent on at least one of the multiple communication links based at least in part on sending a report on at least one of the multiple communication links.

[0203] Example 22, based on the method of any of Examples 1 to 21, wherein the UE is configured to perform dynamic power sharing between a first subset of a plurality of communication links terminating at a first network node and a second subset of a plurality of communication links terminating at a second network node.

[0204] Example 23 is an apparatus for wireless communication, including a processor, a memory coupled to the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as in any of Examples 1 to 22.

[0205] Example 24 is an apparatus that includes components for implementing a method or apparatus as in any of Examples 1 to 22.

[0206] Example 25 is a non-transitory computer-readable medium storing instructions that can be executed by one or more processors to cause one or more processors to implement a method as in any of the examples 1 to 22.

[0207] Additionally or alternatively, the following examples are given by way of illustration. Aspects of the following examples may be combined with aspects or embodiments shown or discussed with respect to the accompanying drawings or elsewhere herein.

[0208] Example 1 is a method for wireless communication at a user equipment (UE), the method comprising: identifying a carrier aggregation configuration for a plurality of communication links, wherein at least one of the plurality of communication links includes a side link; determining an event associated with the side link that triggers a power headroom report; and transmitting a power headroom report at least in part based on the determined event associated with the side link that triggers the power headroom report.

[0209] Example 2 of the method according to Example 1 further includes receiving a set of reference signals from a relay UE via a side link; and measuring a set of path loss values ​​based at least in part on the received set of reference signals, wherein determining the side link-related event that triggers a power margin report is based at least in part on the measured set of path loss values.

[0210] Example 3, based on the method of Example 2, further includes determining a minimum path loss value among the measured path loss values, wherein determining the side-link-related event that triggers the power margin report is based at least in part on determining the minimum path loss value.

[0211] Example 4 of the method according to any one of Examples 1 to 3 further includes determining the activation of a carrier on a side link or access link in a plurality of communication links, wherein determining the side link-related event that triggers a power margin report is based at least in part on determining the activation of a carrier on the side link or access link.

[0212] Example 5, based on the method of any of Examples 1 to 4, further includes establishing an additional side link, wherein determining the side link-related event that triggers the power margin report is based at least in part on establishing the additional side link.

[0213] Example 6 of the method according to any one of Examples 1 to 5 further includes determining a power backoff value associated with a side link or access link among a plurality of communication links, wherein determining the side link-related event that triggers a power headroom report is based at least in part on determining the power backoff value associated with the side link or access link.

[0214] Example 7 of the method according to any of Examples 1 to 6 further includes determining available resources for transmitting a power headroom report, wherein transmitting the power headroom report includes: transmitting a power headroom report media access control-control element on a physical side link shared channel or a physical uplink shared channel based at least in part on determining the available resources.

[0215] Example 8, based on any of Examples 1 to 7, further includes transmitting a power margin report medium access control element via a side link or access link, at least in part, based on a logical channel priority limiting strategy.

[0216] Example 9, based on the method of any of Examples 1 to 8, wherein at least one of the plurality of communication links includes an access link.

[0217] Example 10 of the method according to Example 9, wherein the access link and the side link associated with the relay UE associated with the access link terminate at the same network node.

[0218] Example 11, based on the method of any of Examples 1 to 10, further includes determining a set of carriers associated with the side link based at least in part on a carrier aggregation configuration, wherein each carrier in the set of carriers shares the same media access control entity.

[0219] Example 12 of the method according to Example 11, wherein each carrier in the set of carriers corresponds to a corresponding index in the bitmap of the power margin report medium access control - control element, the corresponding index identifying each carrier and associating each carrier with a corresponding communication link in a plurality of communication links.

[0220] Example 13, based on the method of any of Examples 1 to 12, wherein multiple communication links share the same media access control entity.

[0221] Example 14 of the method according to any of Examples 1 to 13, wherein the power headroom report includes power headroom information for each active carrier on the side link, or power headroom information for each active carrier on the uplink with configuration with the access link, or both.

[0222] Example 15 is an apparatus for wireless communication, including a processor, a memory coupled to the processor, and instructions stored in the memory and executable by the processor to cause the apparatus to perform a method as in any of Examples 1 to 14.

[0223] Example 16 is an apparatus that includes components for implementing a method or apparatus as in any of Examples 1 to 14.

[0224] Example 17 is a non-transitory computer-readable medium storing instructions that can be executed by one or more processors to cause one or more processors to implement a method as in any of the examples 1 to 14.

[0225] The various illustrative blocks and components described in connection with this disclosure may be implemented or performed using a general-purpose processor, DSP, ASIC, CPU, FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware component, or any combination thereof designed to perform the functions described herein. A general-purpose processor may be a microprocessor, but alternatively, 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, multiple microprocessors, a combination of one or more microprocessors with a DSP core, or any other such configuration).

[0226] The functions described herein can be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, these functions can be stored as one or more instructions or code in or transmitted through a computer-readable medium. Other examples and implementations are within the scope of this disclosure and the appended claims. For example, due to the nature of software, the functions described herein can be implemented using software executed by a processor, hardware, firmware, hardwired, or any combination thereof. Features implementing the functions can also be physically located in different locations, including being distributed such that portions of the functions are implemented in different physical locations.

[0227] Computer-readable media include non-transitory computer storage media and communication media, with communication media including any medium that facilitates the transfer of a computer program from one place to another. Non-transitory storage media can be any available medium accessible to a general-purpose or special-purpose computer. By way of example, and not limitation, non-transitory computer-readable media can include random access memory (RAM), read-only memory (ROM), electrically erasable programmable ROM (EEPROM), flash memory, optical disc (CD) ROM or other optical disc storage, disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code components in the form of instructions or data structures and that can be accessed by a general-purpose or special-purpose computer or a general-purpose or special-purpose processor. Furthermore, any connection is properly referred to as a computer-readable medium. For example, if software is transmitted from a website, server, or other remote source using coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), or wireless technologies such as infrared, radio, and microwave, then coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are all included in the definition of computer-readable media. As used in this article, discs and platters include CDs, laser discs, optical discs, digital multifunction discs (DVDs), floppy disks, and Blu-ray discs. Discs typically reproduce data magnetically, while platters reproduce data optically using lasers. Combinations of these are also included within the scope of computer-readable media.

[0228] As used herein, the word "or" in the list of items (e.g., a list of items beginning with phrases such as "at least one" or "one or more") signifies an inclusive list, such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Furthermore, as used herein, the phrase "based on" should not be construed as referring to a closed set of conditions. For example, an example step described as "based on condition A" may be based on conditions A and B without departing from the scope of this disclosure. In other words, as used herein, the phrase "based on" should be interpreted in the same manner as the phrase "at least partially based on".

[0229] In the accompanying drawings, similar components or features may have the same reference numerals. Furthermore, various components of the same type may be distinguished by adding a dash after the reference numeral and a second reference numeral to differentiate between similar components. If only the first reference numeral is used in the description, the description applies to any similar component having the same first reference numeral, regardless of the second or other subsequent reference numerals.

[0230] The description presented herein, taken in conjunction with the accompanying drawings, describes an example configuration and does not represent all examples that can be implemented or that are within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration," and not "preferred" or "superior to other examples." To provide an understanding of the described techniques, the detailed description includes specific details. However, these techniques can be implemented without these specific details. In some cases, known structures and devices are shown in block diagram form to avoid obscuring the concept of the described examples.

[0231] The description provided herein is intended to enable those skilled in the art to make or use this disclosure. Various modifications to this disclosure will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other variations without departing from the scope of this disclosure. Therefore, this disclosure is not limited to the examples and designs described herein, but is consistent with the widest scope of the principles and novel features disclosed herein.

Claims

1. A method for performing wireless communication at a user equipment (UE), comprising: Identify a carrier aggregation configuration for multiple communication links, wherein at least one of the multiple communication links includes a side link; Determine whether to activate additional carriers or establish additional side links in the carrier aggregation configuration; The event associated with the sidelink that triggers a power headroom report is determined, at least in part, based on the determination of the activation or establishment of the additional sidelink by the additional carrier in the carrier aggregation configuration; and The power headroom report is sent at least in part based on the determined event associated with the side link that triggers the power headroom report.

2. The method according to claim 1, further comprising: A set of reference signals is received from the relay UE via the side link; as well as A set of path loss values ​​is measured at least in part based on a set of received reference signals, wherein the event associated with the side link that triggers the power margin report is determined at least in part based on the measured set of path loss values.

3. The method according to claim 2, further comprising: Determine the minimum path loss value among the measured path loss values, wherein determining the event associated with the side link that triggers the power margin report is at least in part based on determining the minimum path loss value.

4. The method according to claim 1, wherein, The additional carriers include carriers on the access links or side links of the plurality of communication links.

5. The method according to claim 1, further comprising: Determine a power backoff value associated with an access link or a side link among the plurality of communication links, wherein determining the event associated with the side link that triggers the power headroom report is based at least in part on determining the power backoff value associated with the access link or the side link.

6. The method according to claim 1, further comprising: Determine the available resources for sending the power headroom report, wherein sending the power headroom report includes: Based at least in part on determining the available resources, a power margin report medium access control-control element is transmitted on the physical side link shared channel or the physical uplink shared channel.

7. The method according to claim 1, wherein, Sending the power headroom report includes: Power margin reports are transmitted via the side link or access link, at least in part, based on a logical channel priority restriction strategy.

8. The method according to claim 1, wherein, At least one of the plurality of communication links includes an access link.

9. The method according to claim 8, wherein, The access link and the side link associated with the relay UE connected to the access link terminate at the same network node.

10. The method according to claim 1, further comprising: A set of carriers associated with the side link is determined at least in part based on the carrier aggregation configuration, wherein each carrier in the set of carriers shares the same medium access control entity.

11. The method according to claim 10, wherein, Each of the set of carriers corresponds to a corresponding index in the bitmap of the power margin report medium access control - control element, the corresponding index identifying each carrier and associating each carrier with a corresponding communication link among the plurality of communication links.

12. The method according to claim 1, wherein, The multiple communication links share the same media access control entity.

13. The method according to claim 1, wherein, The power headroom report includes power headroom information for each active carrier on the side link, or power headroom information for each active carrier on the uplink with the configuration of the access link, or both.

14. An apparatus for wireless communication, comprising: At least one memory containing instructions; as well as At least one processor is configured to execute the instructions to cause the device to: Identify a carrier aggregation configuration for multiple communication links, wherein at least one of the multiple communication links includes a side link; Determine whether to activate additional carriers or establish additional side links in the carrier aggregation configuration; The event associated with the sidelink that triggers a power headroom report is determined, at least in part, based on the determination of the activation or establishment of the additional sidelink by the additional carrier in the carrier aggregation configuration; and The power headroom report is sent at least in part based on the determined event associated with the side link that triggers the power headroom report.

15. The apparatus according to claim 14, wherein, The at least one processor is further configured to cause the device to: A set of reference signals is received from the relay device via the side link; as well as A set of path loss values ​​is measured at least in part based on a set of received reference signals, wherein the instructions for determining the event associated with the side link that triggers the power headroom report can also be executed by the processor at least in part based on the measured set of path loss values.

16. The apparatus according to claim 15, wherein, The at least one processor is further configured to cause the device to: The minimum path loss value among the measured path loss values ​​is determined, wherein the instructions for determining the event associated with the side link that triggers the power margin report can also be executed by the processor at least in part based on the determination of the minimum path loss value.

17. The apparatus according to claim 14, wherein, The additional carriers include carriers on the access links or side links of the plurality of communication links.

18. The apparatus according to claim 14, wherein, The at least one processor is further configured to cause the device to: Determine a power backoff value associated with an access link or a side link among the plurality of communication links, wherein the instruction for determining the event associated with the side link that triggers the power headroom report can also be executed by the processor at least in part based on determining the power backoff value associated with the side link or the access link.

19. The apparatus according to claim 14, wherein, The at least one processor is further configured to cause the device to: Determine the available resources for sending the power headroom report, wherein sending the power headroom report includes: Based at least in part on determining the available resources, a power margin report medium access control-control element is transmitted on the physical side link shared channel or the physical uplink shared channel.

20. The apparatus according to claim 14, wherein, The at least one processor configured to execute the instructions to send the power headroom report is also configured to cause the device to: Power margin reports are transmitted via the side link or access link, at least in part, based on a logical channel priority restriction strategy.

21. The apparatus according to claim 14, wherein, At least one of the plurality of communication links includes an access link.

22. The apparatus according to claim 21, wherein, The access link and the side link associated with the relay UE connected to the access link terminate at the same network node.

23. The apparatus according to claim 14, wherein, The at least one processor is further configured to cause the device to: A set of carriers associated with the side link is determined at least in part based on the carrier aggregation configuration, wherein each carrier in the set of carriers shares the same medium access control entity.

24. The apparatus according to claim 23, wherein, Each of the set of carriers corresponds to a corresponding index in the bitmap of the power margin report medium access control - control element, the corresponding index identifying each carrier and associating each carrier with a corresponding communication link among the plurality of communication links.

25. The apparatus according to claim 14, wherein, The multiple communication links share the same media access control entity.

26. The apparatus according to claim 14, wherein, The power headroom report includes power headroom information for each active carrier on the side link, or power headroom information for each active carrier on the uplink with the configuration of the access link, or both.

27. An apparatus for wireless communication, comprising components for performing the method according to any one of claims 1-13.

28. 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 according to any one of claims 1-13.

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