Phase noise management of out-of-band repeater

A first wireless device transmits one or more transmissions for a second wireless device to a repeater for repetition to the second wireless device; adjusts a repeater operation based on a phase noise in transmission between the first wireless device and the repeater; and communicates with at least one of the repeater or the second wireless device based on the adjusted repeater operation. A repeater receives from a first wireless device, a request for the repeater to report a phase noise in transmissions between the first wireless device and the repeater for repetition with a second wireless device; and transmits a report of the phase noise to the first wireless device based on the request. A repeater receives, from a first wireless device, a transmission for repetition with a second wireless device; and transmits the repetition of the transmission to the second wireless device with a phase noise compensation.

TECHNICAL FIELD

The present disclosure relates generally to communication systems, and more particularly, to wireless communication including a repeater.

INTRODUCTION

BRIEF SUMMARY

In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication at a first wireless device. The apparatus transmits one or more transmissions for a second wireless device to a repeater for repetition to the second wireless device; adjusts a repeater operation based on a phase noise in transmission between the first wireless device and the repeater; and communicates with at least one of the repeater or the second wireless device based on the adjusted repeater operation.

In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication at a repeater. The repeater receives from a first wireless device, a request for the repeater to report a phase noise in transmissions between the first wireless device and the repeater for repetition with a second wireless device; and transmits a report of the phase noise to the first wireless device based on the request.

In another aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided for wireless communication at a repeater. The repeater receives, from a first wireless device, a transmission for repetition with a second wireless device; and transmits the repetition of the transmission to the second wireless device with a phase noise compensation.

DETAILED DESCRIPTION

In certain situations, direct communication between a first wireless device and a second wireless device may be difficult because there is a blockage between the devices or because the second wireless device is out of range of the first wireless device. In such scenarios, a repeater device may be configured to extend the coverage of the second wireless device by amplifying the signals transmitted between the first wireless device and the second wireless device. As an example, a base station may transmit downlink communication for a UE to a repeater for repetition to the UE, and may receive repetitions of uplink transmissions of the UE from the repeater. A link between the base station and the repeater may be referred to as a fronthaul link, and a link between the repeater and the UE may be referred to as an access link.

In some examples, the repeater may support control by a control node, such as a base station, so that a configuration of the repeater can be dynamically adjusted or reconfigured depending on the conditions of the communication system. An out-of-band repeater may operate in different frequency ranges over a fronthaul link with a base station and an access link with a UE. For example, the repeater may transmit and receive signals on the fronthaul link with the base station in FR2, and may transmit and receive signals on the access link with the UE in FR1. In some aspects, the repeater may shift the frequency of the signal that it forwards, or repeats, between the base station and the UE. For example, when repeating/forwarding an uplink transmission from the UE to the base station, the repeater may shift the center frequency of the uplink signal from FR1 to FR2 before forwarding the signal to the base station. The repeater may shift the frequency without changing the numerology of the forwarded signal. The downlink signals for the UE and the uplink signals from the UE may be based on FR1 numerologies (e.g., a 15 kHZ or 30 kHz subcarrier spacing (SCS)).

In some aspects, phase noise may be introduced in signals based on higher frequency (e.g., FR2) components such as local oscillators. The repeater and the base station may experience phase noise in the FR2 signals. The phase noise may affect the UE's signal, which has a smaller SCS and longer symbol duration. The UE may not have a way to compensate for the added phase noise that is introduced based on the signal between the base station and the repeater.

Aspects presented herein provide techniques for addressing or correcting phase noise in the UE's signal, e.g., due to the FR2 signal between the repeater and the base station. In some aspects, a base station may determine a level of the phase noise on the UE's sub-6 signal and may adjust a repeater configuration or stop using a repeater in response phase noise level. The base station may measure a phase noise in the uplink signal forwarded by the repeater or may receive a report of the phase noise from the repeater. In some aspects, the repeater may apply compensation for the phase noise before forwarding the UE's signal.

The wireless communication system ofFIG.1may further include repeaters113that forward communication between a base station102/180and a UE104. The repeater113may be an analog repeater that receives, amplifies, and forwards a signal between the base station102/180and UE104over communication links120. As an example, the repeater113may provide additional coverage for a base station102/180that may have a signal to a UE104at least partially blocked by a blockage117. The repeater113may include a component that is capable of receiving control signaling from a control node (e.g., the base station102,180) and a repeating unit that forwards the communication with one or more parameters based on the control signaling. In some examples, the repeating may be referred to as a remote unit. In some examples, the repeater may be referred to as a pass-through repeater.

As described herein, the control node may include the base station102,180, the IAB node103, etc. The first wireless device may include the base station102,180, the IAB node103, the UE104, or another repeater. The second wireless device may include the base station102,180, the IAB node103, the UE104, or another repeater.

In some aspects, a base station102or180, UE104, or IAB node111, may transmit transmissions for a second wireless device to a repeater113for repetition to the second wireless device (e.g., a UE104, base station102/180, IAB node111, etc.). Similarly, the base station102or180, UE104, or IAB node111may receive repeated transmissions from the second wireless device via the repeater113. A base station102/180, UE104, IAB node111, or other device may include a phase noise component199configured to adjust a repeater operation based on a phase noise in transmission between the first wireless device and the repeater113and to apply the adjusted repeater operation to communicate with the second wireless device and/or the repeater. The repeater113may include a phase noise component198that is configured to receive a request for the repeater113to report a phase noise in transmissions (e.g., between the base station102/180and the repeater113) for repetition to a second wireless device (e.g., with at least one UE104) and to transmit a report of the phase noise to the first wireless device based on the request. The phase noise component198may be configured to receive a transmission from a first wireless device for repetition to at least one second wireless device and to transmit the repetition of the transmission to the second wireless device with a phase noise compensation. Although the following description may be focused on 5G NR, the concepts described herein may be applicable to other similar areas, such as LTE, LTE-A, CDMA, GSM, and other wireless technologies.

In some aspects, a base station102or180may be referred as a RAN and may include aggregated or disaggregated components. As an example of a disaggregated RAN, a base station may include a central unit (CU)106, one or more distributed units (DU)105, and/or one or more remote units (RU)109, as illustrated inFIG.1. A RAN may be disaggregated with a split between an RU109and an aggregated CU/DU. A RAN may be disaggregated with a split between the CU106, the DU105, and the RU109. A RAN may be disaggregated with a split between the CU106and an aggregated DU/RU. The CU106and the one or more DUs105may be connected via an F1 interface. A DU105and an RU109may be connected via a fronthaul interface. A connection between the CU106and a DU105may be referred to as a midhaul, and a connection between a DU105and an RU109may be referred to as a fronthaul. The connection between the CU106and the core network may be referred to as the backhaul. The RAN may be based on a functional split between various components of the RAN, e.g., between the CU106, the DU105, or the RU109. The CU may be configured to perform one or more aspects of a wireless communication protocol, e.g., handling one or more layers of a protocol stack, and the DU(s) may be configured to handle other aspects of the wireless communication protocol, e.g., other layers of the protocol stack. In different implementations, the split between the layers handled by the CU and the layers handled by the DU may occur at different layers of a protocol stack. As one, non-limiting example, a DU105may provide a logical node to host a radio link control (RLC) layer, a medium access control (MAC) layer, and at least a portion of a physical (PHY) layer based on the functional split. An RU may provide a logical node configured to host at least a portion of the PHY layer and radio frequency (RF) processing. A CU106may host higher layer functions, e.g., above the RLC layer, such as a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer. In other implementations, the split between the layer functions provided by the CU, DU, or RU may be different.

An access network may include one or more integrated access and backhaul (IAB) nodes111that exchange wireless communication with a UE104or other IAB node111to provide access and backhaul to a core network. In an IAB network of multiple IAB nodes, an anchor node may be referred to as an IAB donor. The IAB donor may be a base station102or180that provides access to a core network190or EPC160and/or control to one or more IAB nodes111. The IAB donor may include a CU106and a DU105. IAB nodes111may include a DU105and a mobile termination (MT). The DU105of an IAB node111may operate as a parent node, and the MT may operate as a child node.

As illustrated, the repeater113may be configured to perform aspects in connection with the phase noise component198ofFIG.1.

In certain situations, direct communication between a base station and a UE may be at least partially blocked by a blockage, such as shown at117inFIG.1, or the UE may be out of range of the base station. A repeater device may be configured to extend the coverage of the base station by amplifying the signals transmitted between the base station and the UE. In addition to forwarding signals between a base station and a UE, a repeater may forward signals between other devices, such as a base station, IAB node, UE, etc. A repeater is a relay node that performs an amplify and forward operation between two wireless nodes. The repeater may provide a simple and cost-effective way to improve network coverage. The amplify and forward operation of the repeater may be different than a relay node that decodes and forwards the communication, such as an IAB node. A relay node that decodes communication before forwarding the signal may be referred to as a decode and forward relay node.

In some aspects, a repeater may be capable of some types of control, and may receive information such as timing information (e.g., about a slot, symbol, subframe, frame boundary, etc.) about the communication being forwarded, time division duplex (TDD) uplink/downlink configuration, ON-OFF scheduling for the repeater, and/or spatial information for beam management. A first type of repeater may be referred to as a traditional repeater and may amplify and forward the signal without any additional information or control. The repeater may be in an always on state and may receive and forward signals without a change in repeater parameters. A second type of repeater may be referred to as an autonomous smart repeater that is capable of obtaining, acquiring, or inferring information to adjust repeater operation, e.g., without direct control signaling. As an example, the second type of repeater may obtain information based on receiving and decoding broadcast channels, and may adjust one or more repeater parameter based on the obtained information. A third type of repeater may be referred to as a network controlled repeater and may support some aspects of configuration or control based on side information provided to the repeater by a base station. The repeater may receive the information/control signaling/configuration via an established control interface with the base station. In some aspects, the repeater may adjust operation based on side information provided/controlled by the base station without additional side information inferred/obtained by the repeater. In other aspects, the repeater adjust operation based on side information provided/controlled by the base station and also based on remaining side information inferred/obtained/acquired by the repeater itself. In some aspects, the use of the combination of side information from the base station and additional side information obtained/acquired/inferred by the repeater may reduce control signaling overhead and/or latency for the adjustment of parameters at the repeater.

FIG.4Ais a block diagram of an example communication system400including a base station410, a UE430, and a repeater420. The repeater420may include a repeating unit422and a mobile termination424(“MT”). In some examples, the repeating unit422may be referred to as a remote unit. The base station410may correspond to the base station102,180inFIG.1or the base station310inFIG.3. The UE504may correspond to the UE104inFIG.1or the UE350inFIG.3.

InFIG.4A, the repeating unit422of the repeater420may be configured to amplify and transmit downlink signals from the base station410to the UE430using an access link414. The repeating unit422may also be configured to amplify and transmit uplink signals from the UE430to the base station410using the access link414. Thus, the access link414may be used as a path that carries uplink signals from the UE430and/or downlink signals to the UE430. In some examples, the access link414may be controlled by the base station410.

In some examples, the base station410may also establish a front-haul link412with the mobile termination424of the repeater420. The front-haul link412may be configured to carry UL/DL control signals to configure the operation of the repeater420. For example, the front-haul link412may use a control interface of the base station410to send messages to the repeater420to control the beamforming procedures or computations for downlink/uplink transmissions such as using different beams or beams directed to different directions to transmit to different UEs. AlthoughFIG.4Aillustrates an example in which the control node is a base station, in other examples, the control node may be a different device, such as an IAB node. Additionally, the control node may provide control signaling to the repeater for use in repeating communication originating at a different device.

FIG.4Bis an example of a schematic diagram of the repeater420including a repeating unit422and an MT424. The repeater420may also include a receive array428(“RX”) and a transmit array429(“TX”). The receive array428may receive UL/DL signals (e.g., over a control link with a control node and access links with one or more devices for which the repeater forwards communication) and the transmit array429may transmit UL/DL signals (e.g., over the control link and access link(s)). The repeater420may include an analog amplifier421to amplify the UL/DL signals received at the receive array428and pass the amplified signals to the transmit array429(e.g., amplify and forward).

InFIG.4B, the mobile termination component424includes a baseband processor426configured to receive control signaling from a control node (such as the base station410) through the receive array428. For example, the mobile termination424may decode the control signaling to determine the control information provided by the base station, whereas the repeating unit422amplifies and forwards the UL/DL signal (e.g., to the UE430) without decoding the UL/DL signal. The control signaling may include control parameters for the repeater420in forwarding communication (e.g., between the base station410and the UE430). The repeater420applies the control configuration to the repeating unit422component. For example, the repeating unit422may apply one or more control parameters to the receive array428and/or the transmit array429based on the control received by the mobile termination component424from the control node. The repeating unit422may receive and process a control signal from a control node similar to the UE350described in connection withFIG.3.

FIG.5illustrates an example communication flow500between a first wireless device and a second wireless device with an amplify and forward repeater device506. The example inFIG.5illustrates an example for a base station502and a UE504, but the aspects may be similarly applied for repetitions between a UE and UE, an IAB node and UE, an RSU and UE. Similarly, the aspects performed by the base station502may be performed by a UE, an IAB node, an RSU, or another wireless device. Although aspects are described in connection with repetition between a base station and a UE, the aspects may be applied for repetition between two other wireless devices, such as between any of a base station, IAB node, UE, another repeater, etc.

In some examples, the repeater device506may be controlled by a control node, such as the base station502. In other examples, the control node may be separate from the base station or from the device transmitting a signal to be repeated by the repeater device506. The configuration of the repeater device506can be adjusted or reconfigured (statically or dynamically) depending on the conditions (e.g., internal conditions, external conditions, and/or environmental conditions) of the communication system including the base station502, the UE504, and the repeater device506. For example, the base station502may transmit control signaling514to reconfigure the beamforming procedures of the repeater device506based on a change in conditions.

The control signaling514may indicating beamforming information for the repeater device506, e.g., such as a reception beam for receiving communication from the base station502and/or one or more transmission beams for forwarding communication to the UE504. The control signaling514may indicate a transmission power for the repeater to use in uplink and/or downlink forwarding. The control signaling514may indicate an operating bandwidth. In some examples, the operating bandwidth may include frequency processing and filtering. The control signaling514may indicate a time domain resource allocation for the repeater device506. The time domain resource allocation may include an UL/DL pattern that indicates when the repeater device506is configured to use UL and DL resources. For example, a time domain resource allocation may indicate time resources for the repeater device506to apply the indicated beamforming configuration. In some examples, the repeater device506may be configured with more than one beam to be applied at different times, e.g., a set of beams to apply in a pattern. The control signaling514may include ON-OFF scheduling that turns the repeater, or the repeater operation, on and off at particular times or for particular durations. The control signaling514may indicate timing information, such as a slot, symbol, subframe, or frame boundary, for downlink and uplink transmissions with the base station. In some aspects, the repeater may transmit an indication of support for (e.g., a capability) receiving control signaling or additional information from the base station502, at512. The base station502may send the control signaling based on the capability of the repeater device506.

The control signaling may be transmitted or received on a control interface established with the base station502and an MT508(or other component capable of receiving control) of the repeater device506.

The amplify and forward operation may be performed by a repeating unit509of the repeater device506. As illustrated, the base station502may transmit a UE downlink signal522to the repeater device506for forwarding to the UE504. At523, the repeater device506may amplify the downlink signal522from the base station502, and/or may shift the frequency of the downlink signal from FR2 to FR1. The numerology (e.g., of the downlink signal522in FR2 and the downlink signal524after being shifted to FR1) may be based on an FR1 numerology. The repeater may apply the control information received at514in receiving the downlink signal and/or in forwarding the downlink signal to the UE504at524. The UE504may transmit a UE uplink signal526to the repeater device506for forwarding to the base station502. At527, the repeater device506may amplify the uplink signal526from the base station502, and/or may shift the frequency of the uplink signal from FR1 to FR2. The numerology (e.g., of the uplink signal526in FR1 and the uplink signal528after being shifted to FR2) may be based on an FR1 numerology. The repeater may apply the control information received at514in receiving the uplink signal and/or in forwarding the UE uplink signal528to the base station502.

A link between the base station502and the repeater device506may be referred to as a fronthaul link, and a link between the repeater device506and the UE504may be referred to as an access link. As illustrated inFIG.5, the repeater device506may be an out-of-band repeater that operates in different frequency ranges over a fronthaul link with a base station and an access link with a UE. For example, the repeater device506may transmit and receive signals on the fronthaul link with the base station in FR2, and may transmit and receive signals on the access link with the UE in FR1. In some aspects, the repeater may shift the frequency of the signal that it forwards, or repeats, between the base station502and the UE504. For example, when repeating/forwarding an uplink transmission from the UE504to the base station502, the repeater device506may shift the center frequency of the uplink signal from FR1 to FR2 before forwarding the signal to the base station. The repeater may shift the frequency without changing the numerology of the forwarded signal. The downlink signals for the UE and the uplink signals from the UE may be based on FR1 numerologies (e.g., a 15 kHZ or 30 kHz SCS). The waveform communicated between the repeater device506and the base station in FR2 may be based on an FR1 numerology.

In some aspects, phase noise may be introduced in signals based on higher frequency (e.g., FR2) components such as local oscillators. The noise incurred in the oscillators may result in phase modulation of the information signal, and may lead to changes in the frequency spectrum and timing properties of the information signal. The noise related to the oscillators may be referred to as phase noise. Phase noise produced in local oscillators may introduce a significant degradation in some frequencies, such as at mmW frequencies, e.g., depending on the power spectral density of phase noise. Phase noise leads to a common phase error (CPE) and/or inter-carrier interference (ICI). CPE may lead to an identical, or similar, rotation of a received symbol in each subcarrier. ICI may lead to a loss of orthogonality between the subcarriers.

The repeater device506and the base station502may experience phase noise in the FR2 signals. The phase noise may affect the UE's signal, which has a smaller SCS and longer symbol duration. The UE504may not have a way to compensate for the added phase noise that is introduced based on the signal between the base station502and the repeater device506. As an example, the UE signals may not include a phase tracking reference signal (PTRS) as the signals524and526may be in a frequency range (e.g., FR1), that does not include signaling framework for a PTRS.

Aspects presented herein provide techniques for addressing or correcting phase noise in the UE's signal (uplink or downlink), e.g., due to the FR2 signal between the repeater device506and the base station502.

In some aspects, a base station may determine a level of the phase noise on the UE's sub-6 signal and may adjust a repeater configuration or stop using a repeater in response phase noise level.FIG.6illustrates an example communication flow600between a first wireless device and a second wireless device with an amplify and forward repeater606. The example inFIG.6illustrates an example for a base station602and a UE604, but the aspects may be similarly applied for repetitions between a UE and UE, an IAB node and UE, an RSU and UE. Similarly, the aspects performed by the base station602may be performed by a UE, an IAB node, an RSU, or another wireless device.FIG.6illustrates an example communication flow600between a base station602, a repeater606(that may include an MT611and repeating unit609), and a UE604. The aspects ofFIG.6may be employed in connection with the aspects described in connection withFIG.5. The repeater606may be referred to as a frequency shifting repeater, as the repeater606may shift the frequency of the UE signals between FR1 and FR2, as described in connection withFIG.5. The base station602may determine the severity level of the phase noise on the UE's sub-6 signal, at613, and accordingly may adjust the configuration/operation of the repeater606.

If the base station602determines that the phase noise level is below a threshold, the base station602may continue to use the frequency shifting repeater606, and may continue to use an FR2-FR1 frequency shifting configuration for the forwarding operation of the repeater606.

If the base station determines, e.g., at613, that the phase noise meets or exceeds the threshold, the base station602may, in first aspects or a first option650, change a configuration of the repeater606. For example, the repeater606may support a configuration to perform FR2-FR1 frequency shifting, e.g., as described in connection withFIG.5and may support an amplify and forward operation without frequency shifting. The operation without frequency shifting may be referred to as FR1-FR1 operation, and the amplify ad forward operation with frequency shifting may be referred to as FR2-FR1 operation. In some aspects, the repeater606may signal support, at612, for one or more types of operation, and may indicate to the base station602that the repeater606supports FR2-FR1 operation, FR1-FR1 operation, and/or that the repeater supports a configuration change between FR2-FR1 and FR1-FR1 operation. In response to the phase noise, as determined at612, the base station602may indicate to the repeater606, at614, to adopt a different configuration (such as a FR1-FR1 operation/configuration in which the repeater receives and forwards signals in the same FR and without performing a frequency shift). For example, the repeater606may correspond to the repeater device506inFIG.5, and may have been applying a frequency shift at523and527. As illustrated inFIG.6, the repeater606may change to amplify the downlink signal622without a frequency shift, at623, before repeating the downlink signal624to the UE604. Similarly, the repeater606may amplify and forward the uplink signal626, at627, from the UE604to the base station602at628, e.g., without a frequency shift to FR2.

In other aspects, if the base station determines, e.g., at613, that the phase noise meets or exceeds the threshold, the base station602may decide to stop using the repeater606to communicate with the UE604. As a second option or aspect655, the base station may switch to a different repeater608. The base station602may transmit downlink signals632to the new repeater608for forwarding to the UE604at634. The UE604may transmit uplink signals636to the new repeater608for forwarding to the base station602, as uplink signal638. The repeater608may perform an amplify and forward operation with frequency shifting or without frequency shifting, e.g., based on a capability of the repeater608, and/or a configuration provided to the repeater608by the base station602. In other a third option or aspect660, the base station602may stop using the repeater606and may exchange communication directly with the UE604, as shown at640.

The base station may determine the level of the phase noise, e.g., at613, in any of various ways.FIG.7illustrates an example communication flow700between a first wireless device and a second wireless device with an amplify and forward repeater706. The example inFIG.7illustrates an example for a base station702and a UE704, but the aspects may be similarly applied for repetitions between a UE and UE, an IAB node and UE, an RSU and UE. Similarly, the aspects performed by the base station702may be performed by a UE, an IAB node, an RSU, or another wireless device.FIG.7illustrates an example communication flow700between a base station702, a repeater706, and a UE704, including various ways for a base station702to determine a phase noise level. The repeater706may amplify and frequency shift, at723, the downlink signal722before transmission to the UE704at724. The repeater706may amplify and frequency shift, at727, the uplink signal (e.g., the uplink transmission726) before forwarding to the base station at728.FIG.5illustrates example aspects of the frequency shift. The aspects ofFIG.7may be performed in combination with any of the aspects ofFIG.6and/orFIG.5. In some aspects, the base station702may use an uplink signal sent by the UE704(in FR1) as forwarded by the repeater706on FR2 after frequency shifting, at727. The base station602may measure, at730, the phase distortion of the received signal (e.g.,728). The base station702may measure a constant phase offset and a change in the phase offset over time. As an example, the uplink signal728may be scheduled or configured by the base station702. For example, the base station702may have sent a downlink control signal to the UE704at722that scheduled the uplink signal transmission726and/or configured one or more parameter of the uplink transmission726. The downlink control signaling may pass through the same repeater706and be sent over FR2 on the fronthaul and down-converted to FR1 by the repeater706before transmission to the UE at724. The transmission of downlink control signaling to the UE704may work, e.g., if the phase noise level is sufficiently low to allow the UE704to successfully receive and apply the downlink control signaling (e.g., with low MCS). In some aspects, the phase noise measurement, e.g., at730, may be performed during an initial access procedure. For example, the base station may measure a phase noise in a random access channel (RACH) Msg1 or a Msg3 of a random access procedure. As an example,

In some aspects, the source of phase noise may not be the FR1 transmission from the UE, but may be due to the FR2 components at the base station702and the repeater706. The base station may learn the phase noise level over time, e.g., based on uplink signals from multiple UEs via the repeater, e.g., signal(s)732forwarded by the repeater for other UEs that are not illustrated. For example, as the phase noise is introduced in the signal between the repeater and the base station, each uplink signal may include similar phase noise levels even through the signals are with different UEs. The base station702may use the measurement of the phase noise in the UE's uplink signal to determine whether a phase noise threshold has been exceeded, e.g., at613, inFIG.6, which may trigger any of the adjustments described in connection withFIG.6.

In other aspects, the phase noise may be measured based on base station-repeater communication. As an example, the base station702may can transmit a downlink signal736in FR2 to the repeater706, and may request the repeater706to report a phase noise measurement based on the downlink signal. The request may be included in the downlink signal736or may be transmitted in a separate message, e.g., to the MT of the repeater706. The repeater may perform one or more measurements associated with phase noise, in response to the request. For example, the repeater706may estimate a common phase error (CPE) and/or a variation of CPE over time based on the downlink signal from the base station702. The repeater706may report the measured phase noise, or CPE, to the base station702, at738. The base station702may use the report from the repeater to determine whether a phase noise threshold has been exceeded, e.g., at613, inFIG.6, which may trigger any of the adjustments described in connection withFIG.6.

In some aspects, the base station702may indicate the threshold to the repeater, e.g., in the request (e.g., in downlink signal736) or in other control signaling. The repeater706may measure the phase noise in the downlink signal, at730, and may transmit the report for the measurement in response to a measurement that exceeds the threshold indicated by the base station. The use of the threshold by the repeater may reduce the amount of signaling between the repeater and the base station, e.g., with reports of a phase noise that does not exceed the threshold, and may enable the repeater to send targeted reports when a phase noise is to be addressed by the base station.

As another example, the base station702may can transmit a request740to the repeater706to transmit an uplink signal742for measurement of phase noise. The base station702may measure, at744, the uplink signal742from the repeater (e.g., in contrast to the UE uplink signal forwarded by the repeater at728) to measure the phase noise. The base station702may use the measurement of the phase noise in the repeaters uplink signal742to determine whether a phase noise threshold has been exceeded, e.g., at613, inFIG.6, which may trigger any of the adjustments described in connection withFIG.6.

In some aspects, the repeater may apply phase noise compensation when amplifying and forwarding the signal.FIG.8illustrates an example communication flow800between a first wireless device and a second wireless device with an amplify and forward repeater806. The example inFIG.8illustrates an example for a base station802and a UE804, but the aspects may be similarly applied for repetitions between a UE and UE, an IAB node and UE, an RSU and UE. Similarly, the aspects performed by the base station802may be performed by a UE, an IAB node, an RSU, or another wireless device.FIG.8illustrates an example communication flow800between a base station802, a repeater806, and a UE804, including various ways for compensation for or correction of phase noise at the repeater806. The repeater806may amplify and frequency shift, at840, the downlink signal822before transmission to the UE804at824. The repeater806may amplify and frequency shift, at827, the uplink signal826before forwarding to the base station at828.FIG.5illustrates example aspects of the frequency shift. The aspects ofFIG.8may be performed in combination with any of the aspects ofFIG.6and/orFIG.5. The repeater806may support phase noise estimation, e.g., at830, and at least partial compensation or correction of phase noise, e.g., at838. In some aspects, the repeater may support digital processing of the UE's downlink and uplink signals. In some aspects, the repeater may be referred to as a digital repeater.

On the downlink, the repeater receives the signal822from the base station802intended for the UE804. The repeater806digitizes the signal, at832, and stores the digitized signal in a local buffer, at836. The repeater806adjusts the signal822, at838, to compensate for an estimated phase noise, e.g., measured at830, before forwarding the UE's signal to the UE804, at824. For example, the repeater806may forward the UE's downlink signal824in a slot after the phase noise estimation and compensation. In some aspects, the slot may be a first slot after the phase noise estimation. In some aspects, the slot may be 2 or more slots after the phase noise estimation and compensation. To compensate for the phase noise (e.g., compensation), at838, the repeater806at least partially removes the CPE across the symbols of the UE signal. The repeater806may subtract or remove the estimated phase noise from the signal.

The repeater806may acquire an estimation of the phase noise (PN) in any of various ways. In some aspects, the repeater806may measure CPE on the UE's signal, e.g., based on the downlink signal822for the UE804. In some aspects, the repeater may use the UE's downlink signal, e.g., using a reference signal or pilot signal such as downlink DMRS, sent along with the UE's data or control channel to estimate CPE, at830. In some aspects, the repeater806may use a cyclic prefix (CP) of the downlink symbols of the UE's downlink signal822to measure the phase noise or CPE, at830.

In some aspects, the base station802may send an additional reference signal to the repeater806to facilitate the phase noise estimate, at830. As an example, the additional reference signal may include a PTRS, or an additional DMRS, for the repeater. In some aspects, the base station802may transmit the reference signal separately, e.g., at821, from the downlink signal822for the UE. In other aspects, the additional reference signal for the phase noise estimation at the repeater may be multiplexed with the downlink signal822for the UE.

For example, the additional reference signal may be time division multiplexed (TDMed) with UE's signal822. In some aspects, the additional reference signal may be included at the beginning and/or end of the UE's signal822.FIG.9Aillustrates an example900in which the additional reference signal (e.g.,902and904) is included at the beginning and end of the time resources of the UE's downlink signal922(e.g.,822). In some aspects, the additional reference signal(s)902may be interleaved in time with the UE's downlink signal822.FIG.9Billustrates an example925in which the additional reference signal is interleaved in the time resources of the UE's downlink signal922(e.g.,822).

Additionally, or alternatively, the additional reference signal(s) may be frequency division multiplied (FDMed) with UE's signal922(e.g.,822) and sent on separate RBs not occupied by the UE's DL signal922.FIG.9Cillustrates an example950in which the additional reference signal (902,904, and/or906) is included at additional frequency resources than the frequency resources of the UE's downlink signal922(e.g.,822). The reference signal may overlap, at least partially, in time with the UE's downlink signal922, e.g., as shown for the reference signal906. The reference signal may be in time resources before and after the downlink signal922, e.g., as shown for902and904. The frequency resources may be adjacent to, or contiguous with the UE's downlink signal, as shown for902and906, or may be non-contiguous with the UE's downlink signal, as shown for904. In some aspects, the additional reference signal(s) may be interleaved in frequency with the UE's downlink signal822.FIG.9Dillustrates an example975in which the additional reference signal902is interleaved in frequency with the resources of the UE's downlink signal922(e.g.,822).

In some aspects, the repeater806may extract the additional reference signal, at834, and may not forward the additional reference signals to the UE804in the downlink signal824. The repeater extracts, processes these signals, and may not forward them to the UE.FIG.10Aillustrates an example time diagram1000illustrating a UE's downlink signal1022(e.g.,822) that is transmitted by a base station to a repeater for forwarding to a UE, and which includes additional reference signals1002and1004for phase estimation at the repeater.FIG.10Aalso shows the UE's downlink signal1024(e.g.,824) transmitted by the repeater to the UE without the additional reference signal.

The inclusion of the additional reference signal may enable the repeater to compensate for the phase noise of an individual transmission, e.g., whereas the example inFIG.6may be based on longer measurements, e.g., average phase noise measurements or estimates over time or change in phase noise measurements over time.

In some aspects, the repeater806may transmit an additional reference signal to the base station802to enable the base station to measure phase noise in the UE's uplink transmission828. The repeater806may insert the reference signal, at842. The additional reference signal may be in a separate transmission, as shown at829, or may be multiplexed with the uplink transmission828. The additional reference signal may be TDMed and/or FDMed with the uplink transmission828, e.g., as illustrated for the downlink example inFIGS.9A-9D.FIG.10Billustrates an example time diagram1050illustrating a UE's uplink signal1026(e.g.,826) that is transmitted by a UE to a repeater for forwarding to a base station, and the inclusion by the repeater of additional reference signals1002and1004, for phase estimation at the base station, with the UE's uplink signal1028transmitted by the repeater to the base station.

FIG.11Ais a flowchart1100of a method of wireless communication. The method may be performed by a first wireless device (e.g., the apparatus1202). In some aspects, the method may be performed by a base station (e.g., the base station102/180,310,410,502,602,702,802). In some aspects, the method may be performed by a UE (e.g., the UE104,350). In some aspects, the method may be performed by another wireless device, such as an IAB node111, an RSU107, etc. The method may enable adjustment for phase noise in signaling between wireless device and an out-of-band repeater.

At1102, the first wireless device transmits one or more transmissions for a second wireless device to a repeater for repetition to the second wireless device. In some aspects, the first wireless device may be a base station, and the second wireless device may be a UE. In some aspects, the first wireless device may be a UE and the second wireless device may be a base station. In some aspects, the first wireless device may be a UE and the second wireless device may be a UE. For example,FIG.5-8illustrate examples of a base station (as a non-limiting example of a first wireless device) transmitting a downlink signal for a second wireless device to a repeater. A UE may similarly transmit an uplink signal to the repeater for repetition to a base station. The transmission may be performed, e.g., by the transmission component1234of the apparatus1202inFIG.12.

At1104, the first wireless device adjusts a repeater operation based on a phase noise in transmission between the first wireless device and the repeater. The adjustment may be performed, e.g., by the repeater control component1244of the apparatus1202inFIG.12.FIG.6illustrates various aspects and options that the base station may apply to adjust a repeater operation based on a phase noise. For example, the first wireless device may stop communication to the second wireless device via the repeater or transmitting the communication to the second wireless device via a different repeater. As another example, the first wireless device may configure the repeater with a frequency shifting configuration.FIG.7illustrates various ways that the first wireless device may measure or obtain the phase noise.

At1106, the first wireless device communicates with at least one of the repeater or the second wireless device based on the adjusted repeater operation. The communication may include the transmission of signals to the repeater for repetition to the second wireless device based on a change in a frequency shifting configuration as the adjusted repeater operation. The communication may include a direct transmission to the second wireless device without repetition. The communication may be performed, e.g., by the transmission component, e.g., by the transmission component1234and/or the reception component1230.

FIG.11Billustrates an example flowchart of a method1150of wireless communication that may include1102,1104, and1106ofFIG.11A. The method may be performed by a first wireless device (e.g., the apparatus1202). In some aspects, the method may be performed by a base station (e.g., the base station102/180,310,410,502,602,702,802). In some aspects, the method may be performed by a UE (e.g., the UE104,350). In some aspects, the method may be performed by another wireless device, such as an IAB node111, an RSU107, etc.

As illustrated at1101, the first wireless device may receive from the repeater, an indication that the repeater supports the frequency shifting configuration prior to the first wireless device configuring the repeater. The reception may be performed, e.g., by the repeater capability component1248of the apparatus1202inFIG.12. The first wireless device may change a configuration of the repeater based on the receipt of the indication that the repeater supports the configuration change.

As illustrated at1103, the first wireless device may receive, from the repeater, a repeated signal transmission from the second wireless device. For example,FIG.5-8illustrate examples of a base station (e.g., as a non-limiting example of a first wireless device) receiving an uplink signal from a UE (e.g., as a non-limiting example of a second wireless device) via a repeater. The reception may be performed, e.g., by the reception component1230of the apparatus1202.

As illustrated at1110, the first wireless device may measure the phase noise in the transmission between the first wireless device and the repeater, where the first wireless device adjusts the repeater operation based on a measured phase noise being higher than a threshold.FIG.7illustrates various ways that the base station may measure or obtain the phase noise. As an example, the first wireless device may measure a change in a phase offset over time in the transmissions from the second wireless device. As an example, the first wireless device may receive multiple signals from the second wireless device that are repeated by the repeater and may measure the phase noise by measuring a change in phase offset over time in the multiple signals from the at least one second wireless device. The first wireless device may measure the change in the phase offset over the time for communication (e.g., multiple signals) from multiple other wireless devices (e.g., multiple UEs, in some aspects) communicating with the first wireless device.

As illustrated at1126, the first wireless device may receive an indication of the phase noise from the repeater, wherein the first wireless device adjusts the repeater operation based on a measured phase noise being higher than a threshold. The reception may be performed, e.g., by the phase noise component1250of the apparatus1202. In some aspects, the first wireless device may transmit a request for the repeater to report the phase noise, the indication being received in response to the request, at1112. The request may be transmitted by the request component1246of the apparatus1202inFIG.12. The request may indicate for the repeater to report the phase noise if the phase noise exceeds a phase noise threshold. In some aspects, the first wireless device may transmit an additional signal to the repeater, at1124, with the one or more transmission for the repetition to the second wireless device, the additional signal including at least one of a DMRS, a PTRS, or an additional reference signal for the repeater. The additional signal may be multiplexed in at least one of time resources or frequency resources with a signal for the second wireless device. The multiplexing may include any of the aspects described in connection withFIG.9A-Dor10A.

As illustrated, at1108, the first wireless device may receive a reference signal (e.g., an additional reference signal) from the repeater, the reference signal multiplexed in the repetition of a signal from the first wireless device, wherein the phase noise is based the reference signal. The additional reference signal may include any of the aspects described in connection withFIGS.8-10B. The reception may be performed by the reception component1230, and measurement of the phase noise based on the reference signal may be performed, e.g., by the phase noise component1250of the apparatus1202.

FIG.12is a diagram1200illustrating an example of a hardware implementation for an apparatus1202. The apparatus1202may be a base station, a component of a base station, or may implement base station functionality. The apparatus may be a UE, a component of a UE, or may implement UE functionality. The apparatus may be another wireless device, such as an IAB node, and RSU, etc. In some aspects, the apparatus1202may include a baseband unit1204. The baseband unit1204may communicate through a cellular RF transceiver1222with the UE104. The baseband unit1204may include a computer-readable medium/memory. The baseband unit1204is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the baseband unit1204, causes the baseband unit1204to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the baseband unit1204when executing software. The baseband unit1204further includes a reception component1230, a communication manager1232, and a transmission component1234. The communication manager1232includes the one or more illustrated components. The components within the communication manager1232may be stored in the computer-readable medium/memory and/or configured as hardware within the baseband unit1204. The baseband unit1204may be a component of a wireless device, (such as a base station310or UE350) and may include the memory376and/or at least one of the TX processor316, the RX processor370, and the controller/processor375.

The communication manager1232includes a transmission component1234that transmits transmission(s) for a second wireless device to a repeater, e.g., as described in connection with1102inFIG.11A or11B. The communication manager1232further includes a reception component1230that receives, from the repeater, an uplink repetition of one or more uplink transmissions from the second wireless device, e.g., as described in connection with1104inFIG.11A or11B. The communication manager1232further includes a repeater control component1244that adjusts a repeater operation based on a phase noise in transmission between the first wireless device and the repeater, e.g., as described in connection with1106inFIG.11A or11B. The communication manager1232further includes a request component1246that transmits a request for the repeater to report a phase noise, e.g., as described in connection with1122inFIG.11B. The communication manager1232further includes a repeater capability component1248that receives, from the repeater, an indication that the repeater supports the frequency shifting configuration prior to configuring the repeater, e.g., as described in connection with1101inFIG.11B. The communication manager1232further includes a phase noise component1250that measures the phase noise in the transmission between the first wireless device and the repeater or receives an indication of the phase noise from the repeater, e.g., as described in connection with1108,1110or1126inFIG.11B.

The apparatus may include additional components that perform each of the blocks of the algorithm in the flowchart ofFIG.11A or11B, and/or any of the aspects performed by the base station (as a non-limiting example of a first wireless device) inFIG.4A,5,6,7, or8. As such, each block in the flowchart ofFIG.11A or11B, and/or any of the aspects performed by the base station (as a non-limiting example of a first wireless device) inFIG.4A,5,6,7, or8may be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.

As shown, the apparatus1202may include a variety of components configured for various functions. In one configuration, the apparatus1202, and in particular the baseband unit1204, includes means for transmitting one or more transmissions for a second wireless device to a repeater for repetition to the second wireless device; means for receiving, from the repeater, an uplink repetition of one or more uplink transmissions from the second wireless device; and means for adjusting a repeater operation based on a phase noise in transmission between the first wireless device and the repeater. The apparatus1202may further include means for measuring the phase noise in the transmission between the first wireless device and the repeater, wherein the first wireless device adjusts the repeater operation based on a measured phase noise being higher than a threshold. The apparatus1202may further include means for receiving an indication of the phase noise from the repeater, wherein the first wireless device adjusts the repeater operation based on a measured phase noise being higher than a threshold. The apparatus1202may further include means for transmitting a request for the repeater to report the phase noise, the indication being received in response to the request. The apparatus1202may further include means for transmitting an additional signal to the repeater with the one or more transmission for the repetition to the second wireless device, the additional signal including at least one of a demodulation reference signal (DMRS), a phase tracking reference signal (PTRS), or an additional reference signal for the repeater. The apparatus1202may further include means for receiving reference signal from the repeater, the reference signal multiplexed in the repetition of the one or more uplink transmission, wherein the phase noise is based the reference signal. The means may be one or more of the components of the apparatus1202configured to perform the functions recited by the means. As described supra, the apparatus1202may include the TX Processor316, the RX Processor370, and the controller/processor375. As such, in one configuration, the means may be the TX Processor316, the RX Processor370, and the controller/processor375configured to perform the functions recited by the means.

FIG.13Ais a flowchart1300of a method of wireless communication. The method may be performed by a repeater (e.g., the repeater113,420,506,606,706,806; the apparatus1502. The method may enable adjustment for phase noise in signaling between a first wireless device and an out-of-band repeater.

At1302, the repeater receives from a first wireless device, a request for the repeater to report a phase noise in transmissions between the first wireless device and the repeater for repetition with at least one second wireless device. In some aspects, the first wireless device may be a base station, and the second wireless device may be a UE. In some aspects, the first wireless device may be a UE and the second wireless device may be a base station. In some aspects, the first wireless device may be a UE and the second wireless device may be a UE. The request may indicate for the repeater to report the phase noise if the phase noise exceeds a phase noise threshold, the report being transmitted based on the phase noise exceeding the phase noise threshold.FIG.7illustrates an example of a repeater receiving a request from a first wireless device. The request may be received, e.g., by the request component1546of the apparatus1502inFIG.15.

At1306, the repeater transmits a report of the phase noise to the first wireless device based on the request.FIG.7illustrates an example of a repeater transmitting a report of the phase noise to the first wireless device. The transmission may be performed, e.g., by the phase noise component1550of the apparatus1502inFIG.15.

FIG.13Billustrates a method1350of wireless communication that may include1302and1306fromFIG.13A. As illustrated at1308, the repeater may receive a frequency shifting configuration from the first wireless device.FIG.6illustrates an example of a repeater receiving a change of a configuration for frequency shifting, e.g., at650. In some aspects, the first wireless device may be a base station, and the second wireless device may be a UE. In some aspects, the first wireless device may be a UE and the second wireless device may be a base station. In some aspects, the first wireless device may be a UE and the second wireless device may be a UE.

At1310, the repeater may receive one or more transmissions from a second wireless device, and at1312, when transmitting the repetition of the one or more uplink transmissions to the first wireless device with a frequency shift based on the frequency shifting configuration. The uplink transmissions may be received and transmitted by the transmission component1534the apparatus1502.

In some aspects, the repeater may transmit, to the first wireless device, an indication that the repeater supports the frequency shifting configuration prior to receiving the frequency shifting configuration, at1301.FIG.6illustrates an example of a UE (e.g., as a non-limiting example of a second wireless device) providing the indication to the first wireless device. The transmission may be performed, e.g., by the repeater capability component1548of the apparatus1502.

In some aspects, at1304, the repeater may measure the phase noise based on the signal for the second wireless device. In some aspects, at1304, the repeater may measure the phase noise based on an additional signal to the repeater with one or more transmissions for repetition to the second wireless device. The additional signal may include at least one of a DMRS for the repeater, a PTRS, or an additional reference signal for the repeater. The additional signals may be multiplexed in at least one of time resources or frequency resources with a signal for the second wireless device.FIGS.9A-9D and10Aillustrate various aspects of an additional signal that the repeater may receive to measure phase noise.

In some aspects, the repetition of the one or more transmissions from the second wireless device that is transmitted at1312, may include an additional signal from the repeater. The additional signal may include at least one of a DMRS for the first wireless device, a PTRS, or an additional reference signal for the first wireless device, the additional signal being multiplexed in at least one of time resources or frequency resources with a signal from the second wireless device.FIGS.10A and10Billustrate various aspects of transmitting an additional signal to a first wireless device. The transmission may be performed, e.g., by the transmission component1534of the apparatus1502.

FIG.14Ais a flowchart1400of a method of wireless communication. The method may be performed by a repeater (e.g., the repeater113,420,506,606,706,806; the apparatus1502. The method may enable adjustment for phase noise in signaling between a wireless device and an out-of-band repeater.

At1402, the repeater receives, from a first wireless device, a transmission for repetition with at least one second wireless device. In some aspects, the first wireless device may be a base station, and the second wireless device may be a UE. In some aspects, the first wireless device may be a UE and the second wireless device may be a base station. In some aspects, the first wireless device may be a UE and the second wireless device may be a UE.FIGS.4A-10Aillustrates various aspects of a repeater receiving transmissions for a UE (e.g., as a non-limiting example of a second wireless device). The reception may be performed, e.g., by the reception component1530of the apparatus1502inFIG.15.

At1404, the repeater transmits the repetition of the transmission to the at least one second wireless device with a phase noise compensation.FIG.8illustrates various aspects of phase noise measurement and compensation that may be applied by the UE. The transmission may be performed, e.g., by the transmission component1534of the apparatus1502inFIG.15with compensation applied by the compensation component1544.

FIG.14Billustrates an example flowchart of a method1450of wireless communication that may include1402and1412ofFIG.14A. As illustrated at1410, the repeater may further adjust the repetition of the transmission, at the repeater to remove a CPE across symbols of the transmission before transmitting the repetition to the second wireless device.FIG.8illustrates various aspects of a repeater compensating for phase noise. The compensation may be performed, e.g., by the compensation component1544of the apparatus1502.

As illustrated at1404, the repeater may perform a phase noise measurement based on the transmission for the second wireless device. The phase noise measurement may be based on at least one of a DMRS or a cyclic prefix of the transmission for the second wireless device. Various aspects of phase noise measurement are described in connection withFIG.8. The measurement may be performed, e.g., by the phase noise component1550of the apparatus1502inFIG.15.

As illustrated at1406, the repeater may perform a phase noise measurement based on an additional signal received from the first wireless device with the transmission for the repetition to the second wireless device. Various aspects of phase noise measurement based on an additional signal are described in connection withFIG.8-10A. The additional signal may include at least one of a DMRS for the repeater, a PTRS, or an additional reference signal for the repeater. The additional signal may be multiplexed in at least one of time resources or frequency resources with a signal for the second wireless device.FIGS.9A-9Dillustrate various examples of multiplexing the additional signal with the signal for the UE. The measurement may be performed, e.g., by the phase noise component1550of the apparatus1502inFIG.15.

As illustrated at1408, the repeater may extract the additional signal from the transmission prior to transmitting the repetition of the transmission to the second wireless device.FIG.10Aillustrates an example of a repeater extracting the additional reference signal. The extraction may be performed, e.g., by the transmission component1534of the apparatus1502.

FIG.15is a diagram1500illustrating an example of a hardware implementation for an apparatus1502. The apparatus1502may be a repeater, a component of a repeater, or may implement repeater functionality. In some aspects, the apparatus1502may include a baseband unit1504in an MT component1528. The apparatus1502may include a repeating unit1506that is configured to repeat communication, e.g., based on an amplify and forward operation, e.g., as described in connection with any ofFIGS.4A-10B. The MT component1528may receive control signaling, other information, reference signals, and communication from a base station102/180, or from a UE104. The repeating unit1506may repeat (e.g., amplify and forward) downlink and uplink signals between the UE104and the base station102/180, e.g., based on control received by the MT component1528. The baseband unit1504may communicate through a cellular RF transceiver1522with a control node, such as a base station102/180. The baseband unit1504may include a computer-readable medium/memory. The baseband unit1504is responsible for general processing, including the execution of software stored on the computer-readable medium/memory. The software, when executed by the baseband unit1504, causes the baseband unit1504to perform the various functions described supra. The computer-readable medium/memory may also be used for storing data that is manipulated by the baseband unit1504when executing software. The baseband unit1504further includes a reception component1530, a communication manager1532, and a transmission component1534. The communication manager1532includes the one or more illustrated components. The components within the communication manager1532may be stored in the computer-readable medium/memory and/or configured as hardware within the baseband unit1504. The baseband unit1504may be a component of the repeater113and may include the memory376and/or at least one of the TX processor316, the RX processor370, and the controller/processor375.

The apparatus1502includes a reception component1530that is configured to receive from a first wireless device, a transmission for repetition with at least one second wireless device, e.g., as described in connection with1402inFIGS.14A and14B. The apparatus1502further includes a transmission component1534that transmits the repetition of the one or more uplink transmissions to the first wireless device with a frequency shift based on the frequency shifting configuration, e.g., as described in connection with1312inFIG.13B, or that extracts the additional signal from the transmission, e.g., as in1408. The apparatus1502further includes a compensation component1544that adjusts the repetition of the transmission, at the repeater to remove a CPE across symbols of the transmission, e.g., as described in connection with1410and/or transmits the repetition of the transmission to the at least one second wireless device with a phase noise compensation, e.g., as described in connection with1412. The apparatus1502further includes a request component1546that receives, from a first wireless device, a request to report a phase noise in transmissions between the first wireless device and the repeater for repetition with at least one second wireless device, e.g., as described in connection with1302inFIG.13A or13B. The apparatus1502further includes a repeater capability component1548that transmits an indication that the repeater supports the frequency shifting configuration prior to receiving the frequency shifting configuration, e.g., as described in connection with1301inFIG.13B. The apparatus1502further includes a phase noise component1550that performs a phase noise measurement, e.g., as described in connection with any of1304,1404, or1406, or that is configured to transmit a report of the phase noise from the repeater to the first wireless device, e.g., as in1306.

The apparatus may include additional components that perform each of the blocks of the algorithm in the flowcharts ofFIGS.13A,13B and/or14A or14B, and any of the aspects performed by the repeater inFIGS.4A-10B. As such, each block in the flowcharts ofFIGS.13A,13B,14A and/or14B, and any of the aspects performed by the repeater inFIGS.4A-10Bmay be performed by a component and the apparatus may include one or more of those components. The components may be one or more hardware components specifically configured to carry out the stated processes/algorithm, implemented by a processor configured to perform the stated processes/algorithm, stored within a computer-readable medium for implementation by a processor, or some combination thereof.

As shown, the apparatus1502may include a variety of components configured for various functions. In one configuration, the apparatus1502, and in particular the baseband unit1504, may include means for receiving, from a first wireless device, a request for the repeater to report a phase noise in transmissions between the first wireless device and the repeater for repetition with at least one second wireless device; and means for transmitting a report of the phase noise to the first wireless device based on the request. The apparatus1502may further include means for receiving a frequency shifting configuration from the first wireless device; means for receiving, from the first wireless device, one or more uplink transmissions from a second wireless device; and means for transmitting the repetition of the one or more uplink transmissions to the first wireless device with a frequency shift based on the frequency shifting configuration. The apparatus1502may further include means for transmitting, to the first wireless device, an indication that the repeater supports the frequency shifting configuration prior to receiving the frequency shifting configuration. The apparatus1502may further include means for measuring the phase noise based on an additional signal to the repeater with one or more transmissions for repetition to the second wireless device. The apparatus1502may further include means for transmitting, to the first wireless device, an uplink repetition of the one or more uplink transmissions from the second wireless device, the uplink repetition including an additional signal from the repeater. The apparatus1402may further include means for receiving, from a first wireless device, a transmission for repetition with at least one second wireless device; and means for transmitting the repetition of the transmission to the at least one second wireless device with a phase noise compensation. The apparatus1402may further include means for adjusting the repetition of the transmission, at the repeater to remove a common phase error (CPE) across symbols of the transmission before transmitting the repetition to the second wireless device. The apparatus1402may further include means for performing a phase noise measurement based on the transmission for the second wireless device. The apparatus1402may further include means for performing a phase noise measurement based on an additional signal received from the first wireless device with the transmission for the repetition to the second wireless device. The apparatus1402may further include means for extracting the additional signal from the transmission prior to transmitting the repetition of the transmission to the second wireless device. The means may be one or more of the components of the apparatus1502configured to perform the functions recited by the means. As described supra, the apparatus1502may include the TX Processor316, the RX Processor370, and the controller/processor375. As such, in one configuration, the means may be the TX Processor316, the RX Processor370, and the controller/processor375configured to perform the functions recited by the means.

Aspect 1 is a method of wireless communication at a first wireless device, comprising: transmitting one or more transmissions for a second wireless device to a repeater for repetition to the second wireless device; adjusting a repeater operation based on a phase noise in transmission between the first wireless device and the repeater; and communicating with at least one of the repeater or the second wireless device based on the adjusted repeater operation.

In aspect 2, the method of aspect 1 further includes that the first wireless device is a base station and the second wireless device is a UE.

In aspect 3, the method of aspect 1 further includes that the first wireless device is a first UE and the second wireless device is a second UE.

In aspect 4, the method of any of aspects 1-3 further includes that the adjusting the repeater operation includes at least one of stopping communication with the second wireless device via the repeater or communicating with the second wireless device via a different repeater.

In aspect 5, the method of any of aspects 1-3 further includes that the adjusting the repeater operation includes configuring the repeater with a frequency shifting configuration to shift a signal at the repeater from a first frequency to a second frequency.

In aspect 6, the method of any of aspect 5 further includes that receiving, from the repeater, an indication that the repeater supports the frequency shifting configuration prior to configuring the repeater.

In aspect 7, the method of any of aspects 1-6 further includes that measuring the phase noise in the transmission between the first wireless device and the repeater, wherein the first wireless device adjusts the repeater operation based on a measured phase noise being higher than a threshold.

In aspect 8, the method of aspect 7 further includes that receiving multiple signals from the second wireless device that are repeated by the repeater, wherein measuring the phase noise includes measuring a change in a phase offset over time in multiple signals from at least the second wireless device.

In aspect 9, the method of aspect 7 further includes that measuring the phase noise includes measuring the change in the phase offset over the time for the multiple signals from multiple other wireless devices communicating with the first wireless device.

In aspect 10, the method of any of aspects 1-9 further includes receiving an indication of the phase noise from the repeater, wherein the first wireless device adjusts the repeater operation based on a measured phase noise being higher than a threshold.

In aspect 11, the method of aspect 10 further includes transmitting a request for the repeater to report the phase noise, the indication being received in response to the request.

In aspect 12, the method of aspect 11 further includes that the request indicates for the repeater to report the phase noise if the phase noise exceeds a phase noise threshold.

In aspect 13, the method of any of aspects 1-12 further includes transmitting an additional signal to the repeater with the one or more transmissions for the repetition to the second wireless device, the additional signal including at least one of a DMRS, a PTRS, or an additional reference signal for the repeater, wherein the additional signal is multiplexed in at least one of time resources or frequency resources with a signal for the second wireless device.

In aspect 14, the method of any of aspects 1-13 further includes receiving a reference signal from the repeater, the reference signal multiplexed in the repetition of a signal from the second wireless device, wherein the phase noise is based the reference signal.

Aspect 15 is an apparatus for wireless communication comprising means to perform the method of any of aspects 1-14.

In aspect 16, the apparatus of aspect 15 further includes at least one of an antenna or a transceiver coupled to the at least one antenna and the means to perform the method of any of aspects 1-20.

Aspect 17 is an apparatus for wireless communication comprising memory and at least one processor coupled to the memory, the memory and the at least one processor configured to perform the method of any of aspects 1-14.

In aspect 18, the apparatus of aspect 17 further includes at least one of an antenna or a transceiver coupled to the at least one antenna and the at least one processor.

Aspect 19 is a non-transitory computer-readable storage medium storing computer executable code, the code when executed by a processor causes the processor to perform the method of any of aspects 1-14.

Aspect 20 is a method of wireless communication at a repeater, comprising: receiving, from a first wireless device, a request for the repeater to report a phase noise in transmissions between the first wireless device and the repeater for repetition with a second wireless device; and transmitting a report of the phase noise to the first wireless device based on the request.

In aspect 21, the method of aspect 20 further includes that the first wireless device is a base station and the second wireless device is a UE.

In aspect 22, the method of aspect 20 further includes that the first wireless device is a first UE and the second wireless device is a second UE.

In aspect 23, the method of any of aspects 20-23 further includes that the request indicates for the repeater to report the phase noise if the phase noise exceeds a phase noise threshold, the report being transmitted based on the phase noise exceeding the phase noise threshold.

In aspect 24, the method of any of aspects 20-23 further includes receiving a frequency shifting configuration from the first wireless device; receiving one or more signals from one of the first wireless device or the second wireless device; and transmitting the repetition of the one or more signals to the other of the first wireless device or the second wireless device with a frequency shift based on the frequency shifting configuration.

In aspect 25, the method of aspect 24 further includes transmitting, to the first wireless device, an indication that the repeater supports the frequency shifting configuration prior to receiving the frequency shifting configuration.

In aspect 26, the method of any of aspects 20-25 further includes measuring the phase noise based on an additional signal to the repeater with one or more transmissions for repetition to the at least one second wireless device.

In aspect 27, the method of aspect 26 further includes that the additional signal includes at least one of a DMRS for the repeater, a PTRS, or an additional reference signal for the repeater.

In aspect 28, the method of aspect 26 or 27 further includes that the additional signal is multiplexed in at least one of time resources or frequency resources with at least one transmission from the first wireless device for the second wireless device.

In aspect 29, the method of any of aspects 20-28 further includes transmitting, to the first wireless device, a signal repetition of the one or more signals from the second wireless device including an additional signal from the repeater, wherein the additional signal includes at least one of a DMRS for the first wireless device, a PTRS, or an additional reference signal for the first wireless device, the additional signal being multiplexed in at least one of time resources or frequency resources with a signal from the second wireless device.

Aspect 30 is an apparatus for wireless communication comprising means to perform the method of any of aspects 20-29.

In aspect 31, the apparatus of aspect 30 further includes at least one of an antenna or a transceiver coupled to the at least one antenna and the means to perform the method of any of aspects 20-29.

Aspect 32 is an apparatus for wireless communication comprising memory and at least one processor coupled to the memory, the at least one processor configured to perform the method of any of aspects 20-29.

In aspect 33, the apparatus of aspect 30 further includes at least one of an antenna or a transceiver coupled to the at least one antenna and the at least one processor.

Aspect 34 is a non-transitory computer-readable storage medium storing computer executable code, the code when executed by a processor causes the processor to perform the method of any of aspects 20-29.

Aspect 35 is a method of wireless communication at a repeater, comprising: receiving, from a first wireless device, a transmission for repetition with a second wireless device; and transmitting the repetition of the transmission to the second wireless device with a phase noise compensation.

In aspect 36, the method of aspect 35 further includes that the first wireless device is a base station and the second wireless device is a UE.

In aspect 37, the method of aspect 35 further includes that the first wireless device is a first UE and the second wireless device is a second UE.

In aspect 38, the method of any of aspects 35-37 further includes adjusting the repetition of the transmission, at the repeater to remove a CPE across symbols of the transmission before transmitting the repetition to the second wireless device.

In aspect 39, the method of aspect 38 further includes performing a phase noise measurement based on the transmission for the second wireless device.

In aspect 40, the method of aspect 38 or 39 further includes that the phase noise measurement is based on at least one of a DMRS or a cyclic prefix of the transmission for the second wireless device.

In aspect 41, the method of any of aspects 35-40 further includes performing a phase noise measurement based on an additional signal received from the first wireless device with the transmission for the repetition to the second wireless device, wherein the additional signal includes at least one of a demodulation reference signal (DMRS) for the repeater, a phase tracking reference signal (PTRS), or an additional reference signal for the repeater.

In aspect 42, the method of aspect 41 further includes that the additional signal is multiplexed in at least one of time resources or frequency resources with a signal for the second wireless device.

In aspect 43, the method of aspect 41 or 42 further includes extracting the additional signal from the transmission prior to transmitting the repetition of the transmission to the second wireless device.

Aspect 44 is an apparatus for wireless communication comprising means to perform the method of any of aspects 35-43.

In aspect 45, the apparatus of aspect 44 further includes at least one of an antenna or a transceiver coupled to the at least one antenna and the means to perform the method of any of aspects 35-43.

Aspect 46 is an apparatus for wireless communication comprising memory and at least one processor coupled to the memory, the at least one processor configured to perform the method of any of aspects 35-43.

In aspect 47, the apparatus of aspect 46 further includes at least one of an antenna or a transceiver coupled to the at least one antenna and the at least one processor.

Aspect 48 is a non-transitory computer-readable storage medium storing computer executable code, the code when executed by a processor causes the processor to perform the method of any of aspects 35-43.