Wideband microsleep technique

Abstract

A method, system, and device for wireless communication are described. In the wireless communication system, a first user equipment (UE) may receive a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, and the first symbol period immediately precedes the second symbol period in the time domain. The first UE may calculate, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message. In some cases, the first UE may power down at least one radio frequency chain based on a result of the calculated correlation satisfying a threshold.

Description

[Technical field]

[0001] cross reference This patent application claims priority to U.S. patent application Ser. No. 17 / 366,982 by Yunusov et al., entitled “WIDEBAND MICRO SLEEP TECHNIQUES,” filed July 2, 2021, which is assigned to the assignee of the present application and is expressly incorporated herein by reference. [Background technology]

[0002] Wireless communication systems are widely deployed to provide various types of communication content, such as voice, video, packet data, messaging, broadcasts, and the like. These systems may be capable of supporting 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 Advanced (LTE-A), or LTE-A Pro systems, and fifth generation (5G) systems, sometimes referred to as New Radio (NR) systems. These systems may employ technologies such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal FDMA (OFDMA), or Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing (DFT-S-OFDM). A wireless multiple access communication system may include one or more base stations or one or more network access nodes, each simultaneously supporting communication for multiple communication devices, which may in some cases be known as user equipment (UE).

[0003] Some wireless communication systems may use various techniques for conserving power in a UE. However, in some cases, some power conservation techniques may prevent the UE from conserving power relatively quickly when communicating with another device; instead, such techniques may delay power conservation until some time after a message is received. Summary of the Invention [Means for solving the problem]

[0004] The described techniques relate to improved methods, systems, devices, and apparatuses that support wideband microsleep techniques. In general, the described techniques provide a user equipment (UE) for using wideband microsleep, for example, in a New Radio (NR) cellular vehicle-to-everything (CV2X) system. In some examples, the UE may reduce power consumption by stopping the radio frequency (RF) chain and skipping modem processing from the beginning of a message after determining that the beginning of the message lacks relevant data (e.g., a valid signal addressed to the UE). For example, the UE may receive the first two symbols of a message, where the first two symbols include a replicated wideband signal. The UE may calculate a correlation between the signals received in the first two symbols, and the UE may determine whether the message includes a valid signal based on comparing the correlation to a threshold. For example, if the correlation is below a threshold, it may be determined that the first two symbols lack relevant data (e.g., control information, physical sidelink control channel (PSCCH)), and thus the UE may power down one or more RF chains and modem processing for the remainder of the message (e.g., for the remaining duration of the subframe) to conserve power. In some cases, the described techniques may be combined with a demodulation reference signal (DMRS)-based approach, where the UE may identify a frequency-domain DMRS pattern associated with the message that the UE may use to further determine whether the message contains valid data for the UE.

[0005] A method for wireless communication in a first UE is described that may include receiving a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain, calculating, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message, and powering down at least one RF chain based on calculating the correlation between the first symbol period and the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0006] An apparatus for wireless communication in a first UE is described. The apparatus may include a processor, a memory coupled to the processor, and instructions stored in the memory. The instructions may be executable by the processor to cause the apparatus to: receive a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain; calculate, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message; and power down at least one RF chain based on calculating the correlation between the first symbol period and the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0007] Another apparatus for wireless communication in a first UE is described. The apparatus may include means for receiving a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain, means for calculating, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message, and means for powering down at least one RF chain based on calculating the correlation between the first symbol period and the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0008] A non-transitory computer-readable medium storing code for wireless communication in a first UE is described, the code may include instructions executable by a processor to: receive a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain; calculate, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message; and power down at least one RF chain based on calculating the correlation between the first symbol period and the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0009] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, receiving a message from the second UE may include operations, features, means, or instructions for receiving the message on a channel that meets a threshold bandwidth, where a correlation between the first symbol period and the second symbol period may be calculated for the channel that meets the threshold bandwidth.

[0010] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, calculating a correlation between first data included in a first symbol period and second data included in a second symbol period of the message may include operations, features, means, or instructions for calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period based on a received signal strength indicator (RSSI) for at least one antenna of a set of one or more antennas.

[0011] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, powering down at least one RF chain based on calculating the correlation may include acts, features, means, or instructions for powering down the at least one RF chain for one or more additional symbol periods of the message, where the one or more additional symbol periods are after the second symbol period in the time domain.

[0012] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for powering down modem processing based on the result of the calculated correlation satisfying a threshold, the modem processing including parameter estimation, channel and noise estimation, decoding, or any combination thereof.

[0013] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining that the first symbol period and the second symbol period exclude control information based on the result of the calculated correlation satisfying a threshold, and at least one RF chain may be powered down based on the determination.

[0014] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for performing automatic gain control (AGC) based on receiving a message, where the same gain state may be associated with the message and a second message received prior to the message, and applying the same gain state to a first symbol period and a second symbol period of the message.

[0015] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining that a gain state may have changed based on receiving the message and a second message received prior to the message, and performing AGC on the received message in response to determining that the gain state may have changed, where the AGC may be based on a first portion of a first symbol period and a correlation between first data included in the first symbol period and second data included in the second symbol period may be based on the first data included in a remainder of the first symbol period and a corresponding portion of the second symbol period, where the remainder of the first symbol period is different from the first portion.

[0016] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, calculating a correlation between first data included in a first symbol period and second data included in a second symbol period of a message may include operations, features, means, or instructions for calculating the correlation excluding one or more DMRS symbol patterns.

[0017] Some examples of the methods, apparatus, and non-transitory computer-readable media described herein may further include operations, features, means, or instructions for determining a demodulation reference signal pattern in the frequency domain across two or more symbols of a message, where at least one RF chain may be powered down based on the determined DMRS pattern and a result of the calculated correlation satisfying a threshold.

[0018] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, at least one RF chain may be powered down based on a result of the calculated correlation being below a threshold.

[0019] In some examples of the methods, apparatus, and non-transitory computer-readable media described herein, the first symbol period and the second symbol period may be received at the beginning of a message. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 illustrates an example of a wireless communication system supporting wideband microsleep techniques according to aspects of the present disclosure. [Diagram 2] FIG. 1 illustrates an example of a wireless communication system supporting wideband microsleep techniques according to aspects of the present disclosure. [Diagram 3] FIG. 1 illustrates an example of a process flow supporting wideband microsleep techniques according to aspects of the present disclosure. [Figure 4]FIG. 1 is a block diagram of a device supporting wideband microsleep techniques according to an aspect of the present disclosure. [Diagram 5] FIG. 1 is a block diagram of a device supporting wideband microsleep techniques according to an aspect of the present disclosure. [Figure 6] FIG. 13 is a block diagram of a communications manager supporting wideband microsleep techniques according to an aspect of the present disclosure. [Figure 7] FIG. 1 is a diagram of a system including a device supporting wideband microsleep techniques according to an aspect of the present disclosure. [Figure 8] 1 is a flowchart illustrating a method for supporting wideband microsleep techniques according to an aspect of the present disclosure. [Figure 9] 1 is a flowchart illustrating a method for supporting wideband microsleep techniques according to an aspect of the present disclosure. [Figure 10] 1 is a flowchart illustrating a method for supporting wideband microsleep techniques according to an aspect of the present disclosure. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] Some wireless communication systems may support communication between one or more wireless devices. For example, a wireless communication system may support a sidelink for communication between multiple user equipments (UEs). A sidelink may refer to any communication link between similar wireless devices (e.g., a communication link between UEs). It should be noted that although various examples provided herein are described with respect to a UE sidelink device, such sidelink techniques may be used for any type of wireless device that uses sidelink communication. For example, a sidelink may support one or more of device-to-device (D2D) communication, vehicle-to-everything (V2X) or vehicle-to-vehicle (V2V) communication, cellular V2X (CV2X) communication, message relay, discovery signaling, beacon signaling, or other signals transmitted over the air from one UE to one or more other UEs.

[0022] In some systems, power consumption can cause chips in the UE to overheat. Furthermore, if the modem is placed in a relatively hot environment (e.g., in a vehicle), the modem may shut down due to overheating. RF processing (e.g., by various components of the radio frequency (RF) chain) may also contribute to chip power consumption and thus further contribute to overheating. Thus, techniques that achieve improved power savings through reduced RF processing can help the UE avoid modem shutdowns due to excessive power consumption and resulting heat.

[0023] In some cases, to reduce power consumption, the UE may use a microsleep procedure to temporarily save power when not communicating with another device and enable relatively reduced power consumption when in a sleep state. In one example, the UE may use a per-subchannel microsleep approach based on demodulation reference signal (DMRS) correlation, and the UE may stop modem processing for a subframe after determining that the subframe lacks relevant data. However, some power saving techniques may lack applicability to wideband signals. Additionally or alternatively, some power saving techniques may cause the UE to process or estimate multiple symbol periods of a subframe, thereby preventing the UE from entering microsleep relatively early (e.g., after receiving a subframe).

[0024] Techniques described herein enable a UE to use wideband microsleep in a wireless communication system (e.g., a New Radio (NR) CV2X system). In some examples, the UE may reduce power consumption by shutting down RF chains and skipping modem processing from the beginning of a message when the UE determines that the beginning of a message excludes relevant data (e.g., for a valid signal). In particular, the UE may receive a first symbol period and a second symbol period of a message (e.g., the first two symbol periods of the message), where the first symbol period and the second symbol period may include a replicated wideband signal. The UE may calculate a correlation between the respective signals received in the two symbol periods, and the UE may determine whether the message includes a valid signal based on comparing the correlation to a predetermined threshold. For example, if the correlation is below the threshold, the UE may determine that the first two symbols lack relevant data (e.g., control information, physical sidelink control channel (PSCCH)), and as a result, the UE may power down one or more RF chains and / or modem processing for the remainder of the subframe to conserve power. Such techniques may allow the UE to enter microsleep relatively quickly (e.g., relatively soon after receiving a message, relatively soon after the second symbol period of the message), allowing for improved power savings at the UE. In some cases, the described techniques may be combined with DMRS-based approaches, where the UE may identify a DMRS pattern (e.g., a frequency-domain DMRS pattern) associated with the message that the UE may use to further determine whether the message contains valid data for the UE. In some cases, the use of a DMRS pattern may allow for further accuracy in determining whether a wideband message contains valid data for the UE.

[0025] Certain aspects of the subject matter described herein may be implemented to realize one or more advantages. The described techniques may support improvements in wideband microsleep. For example, the UE may power down the RF chain and modem processing based on correlation between received signals, which may reduce the amount of modem processing and subsequent power consumption and heating in the UE, thus improving the overall quality of communication between wireless devices. Thus, the supported techniques may include improved network operation and, in some examples, may increase network efficiency, among other benefits.

[0026] Aspects of the present disclosure are first described in the context of a wireless communication system. Aspects of the present disclosure are then described in the context of a process flow. Aspects of the present disclosure are further illustrated by and described with reference to apparatus diagrams, system diagrams, and flow charts relating to wideband microsleep techniques.

[0027] 1 illustrates an example of a wireless communication system 100 supporting wideband microsleep techniques according to aspects of the disclosure. The wireless communication system 100 may include one or more base stations 105, one or more UEs 115, and a core network 130. In some examples, the wireless communication system 100 may be a Long Term Evolution (LTE) network, an LTE-Advanced (LTE-A) network, an LTE-A Pro network, or a New Radio (NR) network. In some examples, the wireless communication system 100 may support enhanced broadband communications, ultra-reliable (e.g., mission-critical) communications, low latency communications, communications with low-cost and low-complexity devices, or any combination thereof.

[0028] The base stations 105 may be distributed throughout a geographic area to form a wireless communication system 100 and may be devices in different forms or with different capabilities. The base stations 105 and the UEs 115 may communicate wirelessly via one or more communication links 125. Each base station 105 may provide a coverage area 110 over which the UEs 115 and the base stations 105 may establish one or more communication links 125. The coverage area 110 may be an example of a geographic area over which the base stations 105 and the UEs 115 may support communication of signals via one or more radio access technologies.

[0029] The UEs 115 may be distributed throughout the coverage area 110 of the wireless communication system 100, and each UE 115 may be fixed or mobile or both at different times. The UEs 115 may be devices in different forms or with different capabilities. Some example UEs 115 are shown in FIG. 1. The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, base stations 105, or network equipment (e.g., core network nodes, relay devices, integrated access and backhaul (IAB) nodes, or other network equipment) as shown in FIG. 1.

[0030] The base stations 105 may communicate with the core network 130, with each other, or both. For example, the base stations 105 may interface with the core network 130 through one or more backhaul links 120 (e.g., via an S1, N2, N3, or other interface). The base stations 105 may communicate with each other over the backhaul links 120 (e.g., via an X2, Xn, or other interface), either directly (e.g., directly between the base stations 105), or indirectly (e.g., via the core network 130), or both. In some examples, the backhaul links 120 may be or include one or more wireless links.

[0031] One or more of the base stations 105 described herein may include or be referred to by those skilled in the art as a base transceiver station, radio base station, access point, radio transceiver, Node B, eNode B (eNB), Next Generation Node B or Giga Node B (any of which may be referred to as a gNB), Home Node B, Home eNode B, or other suitable terminology.

[0032] The UE 115 may include or be referred to as a mobile device, a wireless device, a remote device, a handheld device, or a subscriber device, or some other suitable terminology, and a "device" may also be referred to as a unit, a station, a terminal, or a client, among other examples. The UE 115 may also include or be referred to as a personal electronic device, such as a cellular phone, a personal digital assistant (PDA), a tablet computer, a laptop computer, or a personal computer. In some examples, the UE 115 may include or be referred to as a wireless local loop (WLL) station, an Internet of Things (IoT) device, an Internet of Everything (IoE) device, or a machine type communication (MTC) device, among other examples, which may be implemented in various articles, such as an appliance, or a vehicle, a meter, among other examples.

[0033] The UEs 115 described herein may be capable of communicating with various types of devices, such as other UEs 115, which may act as relays, as shown in FIG. 1, as well as base stations 105 and network equipment, including macro eNBs or gNBs, small cell eNBs or gNBs, or relay base stations, among other examples.

[0034] The UE 115 and the base station 105 may wirelessly communicate with each other via one or more communication links 125 on one or more carriers. The term “carrier” may refer to a set of RF spectrum resources having a defined physical layer structure to support the communication link 125. For example, a carrier used for the communication link 125 may include a portion (e.g., a bandwidth part (BWP)) of an RF spectrum band that operates according to one or more physical layer channels for a given radio access technology (e.g., LTE, LTE-A, LTE-A Pro, NR). Each physical layer channel may carry collection signaling (e.g., synchronization signals, system information), control signaling that coordinates operation on the carrier, user data, or other signaling. The wireless communication system 100 may support communication with the UE 115 using carrier aggregation or multi-carrier operation. The UE 115 may be configured with multiple downlink component carriers and one or more uplink component carriers according to a carrier aggregation configuration. Carrier aggregation may be used with both frequency division duplex (FDD) and time division duplex (TDD) component carriers.

[0035] In some examples (e.g., in a carrier aggregation configuration), a carrier may also have collection or control signaling to coordinate operation with respect to other carriers. A carrier may be associated with a frequency channel (e.g., an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access (E-UTRA) Absolute RF Channel Number (EARFCN)) and may be arranged according to a channel raster for discovery by the UE 115. A carrier may operate in a standalone mode, where initial collection and connection may be made by the UE 115 via the carrier, or the carrier may operate in a non-standalone mode, where a connection is anchored using a different carrier (e.g., of the same or different radio access technology).

[0036] The communication links 125 shown in the wireless communication system 100 may include uplink transmissions from the UE 115 to the base station 105 or downlink transmissions from the base station 105 to the UE 115. A carrier may carry downlink or uplink communications (e.g., in FDD mode) or may be configured to carry downlink and uplink communications (e.g., in TDD mode).

[0037] A carrier may be associated with a particular bandwidth of the RF spectrum, and in some examples, the carrier bandwidth may be referred to as the carrier or the “system bandwidth” of the wireless communication system 100. For example, the carrier bandwidth may be one of several determined bandwidths for a particular radio access technology carrier (e.g., 1.4, 3, 5, 10, 15, 20, 40, or 80 Megahertz (MHz)). The devices of the wireless communication system 100 (e.g., the base station 105, the UE 115, or both) may have a hardware configuration that supports communication on a particular carrier bandwidth or may be configurable to support communication on one of a set of carrier bandwidths. In some examples, the wireless communication system 100 may include a base station 105 or UE 115 that supports simultaneous 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., a sub-band, BWP) or all of the carrier bandwidth.

[0038] A signal waveform transmitted on a carrier may be composed of multiple subcarriers (e.g., using a multicarrier modulation (MCM) technique such as orthogonal frequency division multiplexing (OFDM) or discrete Fourier transform spread OFDM (DFT-S-OFDM)). In a system employing MCM techniques, a resource element may consist of one symbol period (e.g., the duration of one modulation symbol) and one subcarrier, where the symbol period and the subcarrier spacing are inversely related. The number of bits carried by each resource element may depend on the modulation scheme (e.g., the order of the modulation scheme, the coding rate of the modulation scheme, or both). Thus, the more resource elements and the higher the order of the modulation scheme that the UE 115 receives, the higher the data rate of the UE 115 may be. Wireless communication resources may refer to a combination of RF spectrum resources, time resources, and spatial resources (e.g., spatial layers or beams), and the use of multiple spatial layers may further increase the data rate or data integrity for communication with the UE 115.

[0039] One or more numerologies for a carrier may be supported, where the numerology may include a subcarrier spacing (Δf) and a cyclic prefix. A carrier may be divided into one or more BWPs having the same or different numerologies. In some examples, a UE 115 may be configured with multiple BWPs. In some examples, a single BWP for a carrier may be active at a given time, and communication for the UE 115 may be limited to one or more active BWPs.

[0040] The time interval for the base station 105 or the UE 115 may be, for example, T s =1 / (Δf max N f ) seconds, or expressed in multiples of a base time unit, where Δf max may represent the maximum supported subcarrier spacing, and N fmay represent the maximum supported discrete Fourier transform (DFT) size. The communication resource time intervals may be organized according to radio frames, each having a specified duration (e.g., 10 milliseconds (ms)). Each radio frame may be identified by a system frame number (SFN) (e.g., ranging from 0 to 1023).

[0041] Each frame may include multiple consecutively numbered subframes or slots, and each subframe or 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 several slots. Alternatively, each frame may include a variable number of slots, and the number of slots may depend on the subcarrier spacing. Each slot may include several symbol periods (e.g., depending on the length of a cyclic prefix prepended to each symbol period). In some wireless communications systems 100, a slot may be further divided into multiple minislots containing one or more symbols. Excluding the cyclic prefix, each symbol period may include one or more (e.g., N f The duration of a symbol period may depend on the subcarrier spacing or the frequency band of operation.

[0042] A subframe, slot, minislot, or symbol may be the smallest scheduling unit (e.g., in the time domain) of the wireless communications system 100 and may be referred to as a transmission time interval (TTI). In some examples, the TTI duration (e.g., the number of symbol periods in a TTI) may be variable. Additionally or alternatively, the smallest scheduling unit of the wireless communications system 100 may be dynamically selected (e.g., in a burst of shortened TTIs (sTTIs)).

[0043] The physical channels may be multiplexed on the carriers according to various techniques. The physical control channels and the physical data channels may be multiplexed on the downlink carriers using, for example, one or more of a time division multiplexing (TDM), a frequency division multiplexing (FDM), or a hybrid TDM-FDM technique. A control region (e.g., a control resource set (CORESET)) for the physical control channel may be defined by a number of symbol periods and may span the system bandwidth of the carrier or a subset of the system bandwidth. One or more control regions (e.g., a CORESET) may be configured for a set of UEs 115. For example, one or more of the UEs 115 may monitor or search the control region for control information according to one or more search space sets, and each search space set may include one or more control channel candidates at one or more aggregation levels arranged in a cascaded manner. The aggregation level for the control channel candidates may refer to the number of control channel resources (e.g., control channel elements (CCEs)) associated with the coded information for a control information format having a given payload size. The search space sets may include a common search space set configured for sending control information to multiple UEs 115 and a UE-specific search space set for sending control information to a particular UE 115.

[0044] Each base station 105 may provide communication coverage via one or more cells, e.g., macro cells, small cells, hot spots, or other types of cells, or any combination thereof. The term "cell" may refer to a logical communication entity used for communication with the base station 105 (e.g., on a carrier) and may be associated with an identifier (e.g., a physical cell identifier (PCID), a virtual cell identifier (VCID), or other) to distinguish neighboring cells. In some examples, a cell may also refer to a geographic coverage area 110 or a portion (e.g., a sector) of the geographic coverage area 110 in which the logical communication entity operates. Such a cell may range from a smaller area (e.g., a structure, a subset of a structure) to a larger area, depending on various factors such as the capabilities of the base station 105. For example, a cell may be or include a building, a subset of a building, or an outside space between or overlapping with the geographic coverage area 110, among other examples.

[0045] In some examples, the base stations 105 may be mobile and thus provide communication coverage to moving geographic coverage areas 110. In some examples, different geographic coverage areas 110 associated with different technologies may overlap, but the different geographic coverage areas 110 may be supported by the same base station 105. In other examples, overlapping geographic coverage areas 110 associated with different technologies may be supported by different base stations 105. The wireless communication system 100 may include heterogeneous networks, for example, where different types of base stations 105 provide coverage to various geographic coverage areas 110 using the same or different radio access technologies.

[0046] The wireless communications system 100 may support synchronous or asynchronous operation. For synchronous operation, the base stations 105 may have similar frame timing and transmissions from different base stations 105 may be approximately aligned in time. For asynchronous operation, the base stations 105 may have different frame timing and transmissions from different base stations 105 may not be aligned in time, in some examples. The techniques described herein may be used for either synchronous or asynchronous operation.

[0047] Some UEs 115, such as MTC devices or IoT devices, may be low-cost or low-complexity devices and may provide automated communication between machines (e.g., via machine-to-machine (M2M) communication). M2M communication or MTC may refer to data communication technologies that allow devices to communicate with each other or with the base station 105 without human intervention. In some examples, M2M communication or MTC may include communication from devices that incorporate sensors or meters to measure or capture information and relay that information to a central server or application program that utilizes such information or presents the information to a human who interacts with the application program. Some UEs 115 may 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 billing.

[0048] Some UEs 115 may be configured to employ operating modes that reduce power consumption, such as half-duplex communication (e.g., a mode that supports one-way communication via transmission or reception, but not simultaneous transmission and reception). In some examples, the half-duplex communication may be performed at a reduced peak rate. Other power conservation techniques for the UE 115 include entering a power-saving deep sleep mode when not engaged in active communication, operating over a limited bandwidth (e.g., in accordance with narrowband communication), or a combination of these techniques. For example, some UEs 115 may be configured for operation 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 guard band of the carrier, or outside of the carrier.

[0049] The wireless communication system 100 may be configured to support ultra-reliable or low latency communications, or various combinations thereof. For example, the wireless communication system 100 may be configured to support ultra-reliable low latency communications (URLLC) or mission-critical communications. The UE 115 may be designed to support ultra-reliable, low latency, or critical functions (e.g., mission-critical functionality). Ultra-reliable communications may include private or group communications and may be supported by one or more mission-critical services, such as mission-critical push-to-talk (MCPTT), mission-critical video (MCVideo), or mission-critical data (MCData). Support for mission-critical functions may include service prioritization, and the mission-critical services may be used for public safety or general commercial applications. The terms ultra-reliable, low latency, mission-critical, and ultra-reliable low latency may be used interchangeably herein.

[0050] In some examples, the UE 115 may also be able to communicate directly with other UEs 115 over the D2D communication link 135 (e.g., using a peer-to-peer (P2P) protocol or a D2D protocol). One or more UEs 115 utilizing D2D communication may be within the geographic coverage area 110 of the base station 105. Other UEs 115 in such a group may be outside the geographic coverage area 110 of the base station 105 or may not be able to receive transmissions from the base station 105 in some examples. In some examples, a group of UEs 115 communicating via D2D communication may utilize a one-to-many (1:M) system in which each UE 115 transmits to every other UE 115 in the group. In some examples, the base station 105 facilitates scheduling of resources for D2D communication. In other cases, D2D communication occurs between UEs 115 without the involvement of the 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, the vehicles may communicate using V2X communication, V2V communication, or some combination thereof. The vehicles may signal information related to traffic conditions, signal scheduling, weather, safety, emergency situations, or any other information related to the V2X system. In some examples, the vehicles in the V2X system may communicate with roadside infrastructure, such as roadside units, and / or with a network via one or more network nodes (e.g., base stations 105) using vehicle-to-network (V2N) communication.

[0052] The core network 130 may provide user authentication, access authorization, tracking, Internet Protocol (IP) connectivity, and other access, routing, or mobility functions. The core network 130 may be an evolved packet core (EPC) or 5G core (5GC), which may include at least one control plane entity (e.g., a mobility management entity (MME), an access and mobility management function (AMF)) that manages access and mobility, and at least one user plane entity (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)) that routes packets or interconnects to external networks. The control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management for the UEs 115 served by the base stations 105 associated with the core network 130. User IP packets may be forwarded through the user plane entity, which may provide IP address allocation as well as other functions. The user plane entity may be connected to one or more network operators' IP services 150. The IP services 150 may include access to the Internet, an intranet, an IP Multimedia Subsystem (IMS), or packet-switched streaming services.

[0053] Some of the network devices, such as the base station 105, may include subcomponents, such as an access network entity 140, which may be an example of an access node controller (ANC). Each access network entity 140 may communicate with the UE 115 through one or more other access network transmitting entities 145, which may be referred to as a radio head, a smart radio head, or a transmit receiving point (TRP). Each access network transmitting entity 145 may include one or more antenna panels. In some configurations, 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 integrated into a single network device (e.g., the base station 105).

[0054] The wireless communication system 100 may typically operate using one or more frequency bands within the range of 300 megahertz (MHz) to 300 gigahertz (GHz). The 300 MHz to 3 GHz region is commonly known as the ultra-high frequency (UHF) region or decimeter band because the wavelengths range in length from approximately 1 decimeter to 1 meter. Although UHF waves may be blocked or redirected by buildings and environmental features, these waves may penetrate structures sufficiently for a macrocell to serve UEs 115 located indoors. Transmission of UHF waves may be associated with smaller antennas and shorter distances (e.g., less than 100 kilometers) compared to transmissions using lower frequencies and longer waves in the shortwave (HF) or very high frequency (VHF) portions of the spectrum below 300 MHz.

[0055] The wireless communication system 100 may also operate in the super high frequency (SHF) region, also known as the centimeter band, using a frequency band from 3 GHz to 30 GHz, or in the extremely high frequency (EHF) region of the spectrum, also known as the millimeter band (e.g., from 30 GHz to 300 GHz). In some examples, the wireless communication system 100 may support millimeter wave (mmW) communications between the UE 115 and the base station 105, and the EHF antennas of the respective devices may be smaller and more closely spaced than the UHF antennas. In some examples, this may facilitate the use of antenna arrays within the devices. However, propagation of EHF transmissions may experience more atmospheric attenuation and shorter distances than SHF or UHF transmissions. The techniques disclosed herein may be employed across transmissions using one or more different frequency regions, and the designated use of the bands across these frequency regions may vary by country or regulatory body.

[0056] The wireless communication system 100 may utilize both licensed and unlicensed RF spectrum bands. For example, the wireless communication system 100 may employ licensed assisted access (LAA), LTE unlicensed (LTE-U) radio access technology, or NR technology in an unlicensed band, such as the 5 GHz Industrial Scientific and Medical (ISM) band. When operating in an unlicensed RF spectrum band, devices such as the base station 105 and the UE 115 may employ carrier sensing for collision detection and avoidance. In some examples, operation in an unlicensed band may be based on a carrier aggregation configuration in conjunction with a component carrier operating in a licensed band (e.g., LAA). Operation in an unlicensed spectrum may include downlink transmissions, uplink transmissions, P2P transmissions, or D2D transmissions, among other examples.

[0057] The base station 105 or UE 115 may be equipped with multiple antennas that may be used to employ techniques such as transmit diversity, receive diversity, multiple-input multiple-output (MIMO) communications, or beamforming. The antennas of the base station 105 or UE 115 may be located in one or more antenna arrays or antenna panels that may support MIMO operations or transmit or receive beamforming. For example, the antennas or antenna arrays of one or more base stations may be co-located in an antenna assembly such as an antenna tower. In some examples, the antennas or antenna arrays associated with the base station 105 may be located in diverse geographic locations. The base station 105 may have an antenna array with several rows and columns of antenna ports that the base station 105 may use to support beamforming of communications with the UE 115. Similarly, the UE 115 may have one or more antenna arrays that may support various MIMO or beamforming operations. Additionally or alternatively, the antenna panels may support RF beamforming for signals transmitted through the antenna ports.

[0058] A base station 105 or UE 115 may use MIMO communications to exploit multipath signal propagation and increase spectral efficiency by transmitting or receiving multiple signals via different spatial layers. Such techniques may be referred to as spatial multiplexing. The multiple signals may be transmitted by a transmitting device via different antennas or different combinations of antennas, for example. Similarly, the multiple signals may be received by a receiving device via different antennas or different combinations of antennas. Each of the multiple signals may be referred to as a separate spatial stream and may carry bits associated with the same data stream (e.g., the same codeword) or different data streams (e.g., different codewords). The different spatial layers may be associated with different antenna ports used for channel measurements and reporting. MIMO techniques include single-user MIMO (SU-MIMO), in which multiple spatial layers are transmitted to the same receiving device, and multi-user MIMO (MU-MIMO), in which multiple spatial layers are transmitted to multiple devices.

[0059] Beamforming, sometimes referred to as spatial filtering, directional transmission, or directional reception, is a signal processing technique that may be used in a transmitting or receiving device (e.g., base station 105, UE 115) to shape or steer an antenna beam (e.g., transmit beam, receive beam) along a spatial path between the transmitting device and the receiving device. Beamforming may be achieved by combining signals communicated through antenna elements of an antenna array such that some signals propagating in a particular orientation relative to the antenna array are subject to constructive interference and other signals are subject to destructive interference. Adjustment of signals communicated through antenna elements may include the transmitting or receiving device applying an amplitude offset, a phase offset, or both to signals conveyed through an antenna element associated with the device. The adjustment associated with each of the antenna elements may be defined by a beamforming weight set associated with a particular orientation (e.g., relative to the antenna array of the transmitting or receiving device, or to some other orientation).

[0060] The base station 105 or the UE 115 may use beam sweeping techniques as part of a beamforming operation. For example, the base station 105 may use multiple antennas or antenna arrays (e.g., antenna panels) to perform a beamforming operation for directional communication with the UE 115. Some signals (e.g., synchronization signals, reference signals, beam selection signals, or other control signals) may be transmitted by the base station 105 multiple times in different directions. For example, the base station 105 may transmit signals according to different beamforming weight sets associated with different directions of transmission. The transmissions in different beam directions may be used to identify beam directions (e.g., by a transmitting device such as the base station 105 or by a receiving device such as the UE 115) for subsequent transmission or reception by the base station 105.

[0061] Some signals, such as data signals associated with a particular receiving device, may be transmitted by the base station 105 in a single beam direction (e.g., a direction associated with a receiving device, such as the UE 115). In some examples, a beam direction associated with a transmission along a single beam direction may be determined based on signals transmitted in one or more beam directions. For example, the UE 115 may receive one or more of the signals transmitted by the base station 105 in different directions and may report to the base station 105 an indication of the signal that the UE 115 received with the highest signal quality or otherwise acceptable signal quality.

[0062] In some examples, transmission by a device (e.g., by the base station 105 or the UE 115) may be performed using multiple beam directions, and the device may use a combination of digital precoding or RF beamforming to generate a combined beam for transmission (e.g., from the base station 105 to the UE 115). The UE 115 may report feedback indicating precoding weights for one or more beam directions, and the feedback may correspond to a configured number of beams across the system bandwidth or one or more subbands. The base station 105 may transmit reference signals (e.g., cell-specific reference signals (CRS), channel state information reference signals (CSI-RS)) that may be precoded or ampliconed. The UE 115 may provide feedback for beam selection, which may be a precoding matrix indicator (PMI) or codebook-based feedback (e.g., multi-panel type codebook, linear combination type codebook, port selection type codebook). These techniques are described with reference to signals transmitted in one or more directions by the base station 105, although the UE 115 may employ similar techniques for transmitting a signal multiple times in different directions (e.g., to identify a beam direction for subsequent transmission or reception by the UE 115) or for transmitting a signal in a single direction (e.g., to transmit data to a receiving device).

[0063] A receiving device (e.g., UE 115) may attempt multiple receive configurations (e.g., directional listening) when receiving various signals, such as synchronization signals, reference signals, beam selection signals, or other control signals, from the base station 105. For example, the receiving device may attempt multiple receive directions by receiving via different antenna subarrays, by processing the received signals according to different antenna subarrays, by receiving according to different receive beamforming weight sets (e.g., different directional listening weight sets) applied to signals received at multiple antenna elements of the antenna array, or by processing the received signals according to different receive beamforming weight sets applied to signals received at multiple antenna elements of the antenna array, any of which may be referred to as "listening" with different receive configurations or receive directions. In some examples, the receiving device may use a single receive configuration to receive along a single beam direction (e.g., when receiving a data signal). The single receive configuration may be aligned to a beam direction determined based on listening with different receive configuration directions (e.g., a beam direction determined to have the highest signal strength, highest signal-to-noise ratio (SNR), or otherwise acceptable signal quality based on listening with multiple beam directions).

[0064] The wireless communication system 100 may be a packet-based network that operates according to a layered protocol stack. In the user plane, communication at the bearer or Packet Data Convergence Protocol (PDCP) layer may be IP-based. The Radio Link Control (RLC) layer may perform packet segmentation and reassembly to communicate over logical channels. The Medium Access Control (MAC) layer may perform priority handling and multiplexing of logical channels into transport channels. The MAC layer may also use error detection techniques, error correction techniques, or both to support retransmissions at the MAC layer to improve link efficiency. In the control plane, the Radio Resource Control (RRC) protocol layer may establish, configure, and maintain an RRC connection between the UE 115 and the base station 105 or core network 130, which supports radio bearers for user plane data. In the physical layer, the transport channels may be mapped to physical channels.

[0065] The UE 115 and the base station 105 may support retransmission of data to increase the likelihood of successful reception of the data. Hybrid Automatic Repeat Request (HARQ) feedback is one technique for increasing the likelihood that data is correctly received on the communication link 125. HARQ may include a combination of error detection (e.g., using a Cyclic Redundancy Check (CRC)), forward error correction (FEC), and retransmission (e.g., Automatic Repeat Request (ARQ)). HARQ may improve throughput at the MAC layer in poor radio conditions (e.g., low signal-to-noise conditions). In some examples, a device may support same-slot HARQ feedback, in which the device may provide HARQ feedback in a particular slot for data received in a previous symbol in that slot. In other cases, the device may provide HARQ feedback in a subsequent slot or according to some other time interval.

[0066] The wireless communication system 100 may support communication between one or more wireless devices. For example, the wireless communication system may support a sidelink for communication between multiple UEs 115. A sidelink may refer to any communication link 125 between like wireless devices (e.g., a communication link 125 between UEs 115). It should be noted that although various examples provided herein are described with respect to a UE sidelink device, such sidelink techniques may be used for any type of wireless device that uses sidelink communication. For example, a sidelink may support one or more of D2D communication, V2X or V2V communication, CV2X communication, message relay, discovery signaling, beacon signaling, or other signals transmitted over the air from one UE 115 to one or more other UEs 115.

[0067] In some cases, the UE 115 may use wideband microsleep in the wireless communication system 100. In some examples, the UE 115 may reduce power consumption by shutting down RF chains and skipping modem processing from the beginning of a subframe after determining that the beginning of a subframe lacks relevant data (e.g., for a valid signal). The UE 115 may receive the first two symbols of a message that includes a replicated wideband signal. The UE 115 may calculate a correlation between the signals received in the two symbols, and the UE 115 may determine whether the message includes a valid signal based on comparing the correlation to a known threshold. For example, if the correlation is below a threshold, it may be determined that the first two symbols lack relevant data (e.g., control information, PSCCH), and the UE 115 may power down one or more RF chains and modem processing for the remainder of the subframe to conserve power. In some cases, the described techniques may be combined with a DMRS-based approach, and the UE 115 may identify a frequency-domain DMRS pattern associated with the message, which the UE 115 may use to further determine whether the message contains valid data for the UE 115.

[0068] 2 illustrates an example of a wireless communication system 200 supporting wideband microsleep techniques according to aspects of the disclosure. In some examples, the wireless communication system 200 may implement or be implemented by aspects of the wireless communication system 100. For example, the wireless communication system 200 may include a UE 115-a and a UE 115-b, which may be examples of corresponding devices described herein with reference to FIG. 1. The wireless communication system 200 may include features for improved communication between the UEs 115, among other benefits.

[0069] In some cases, the UE 115-a and the UE 115-b may communicate via the sidelink communication link 205-a and the sidelink communication link 205-b. In some cases, the UE 115 may support CV2X communication and the modem in the UE 115 may be in a relatively hot environment (e.g., the UE 115 may be part of a vehicle or may be a vehicle). In some cases, power consumption may be troublesome in wireless communication due to heating of the chip in the modem. For example, the modem may be placed in a relatively hot environment (e.g., around 85° C.), so any heating up to 105° C. may cause the modem to shut down. In some cases, the RF chain, or analog functions in the UE 115, or both, may contribute to the chip power consumption.

[0070] To enable power savings, the UE 115-a and / or UE 115-b may use various sleep or microsleep techniques to turn off one or more RF components of the UE 115 for a certain amount of time and achieve relatively reduced power consumption. For example, the UE 115-a may use a microsleep technique that may be based on DMRS pattern correlation. For example, the UE 115-a may determine whether each subframe of a message lacks relevant data (e.g., a signal) based on the DMRS pattern. If the subframe lacks relevant data, the UE 115-a may reduce power consumption by turning off modem processing, RF functions, or both for the remainder of the subframe. However, such techniques may include the UE 115-a remaining awake for multiple symbol periods, delaying the time at which the UE 115-a can enter a sleep state.

[0071] In some cases, the UE 115-a may use an improved microsleep approach based on data contained in the first two symbols (e.g., in some cases, in addition to one or more DMRS symbols) of the message 210, which may enable the UE 115-a to use microsleep relatively more quickly and result in improved power savings in the UE 115-a. For example, the UE 115-a may reduce power by stopping the RF or analog chains and skipping modem processing from the beginning of the subframe (e.g., at symbol 0, symbol 1) after determining that there is no relevant data in the subframe (e.g., at symbol 0, symbol 1). In some cases, such techniques may achieve power savings over exclusive use of a DMRS pattern per subchannel. However, as described herein, the described techniques may be enhanced using DMRS patterns to enable the UE 115-a to determine whether to reduce modem processing for wideband signals, thus enabling efficient microsleep and power savings.

[0072] The UE 115-b may transmit a message 210 to the UE 115-a via the sidelink communication link 205-a. The message 210 may include a subframe 215 (e.g., the message 210 may include data transmitted during the subframe 215), and the first two symbols in the subframe 215 may include a replicated signal (e.g., for automatic gain control (AGC) convergence). For example, the UE 115-a may receive a first symbol 220-a (e.g., symbol 0) and a second symbol 220-b (e.g., symbol 1), where the first symbol 220-a and the second symbol 220-b may be the same (e.g., symbol 0 is replicated to symbol 1).

[0073] After receiving the first symbol 220-a and the second symbol 220-b, the UE 115-a may perform a correlation between the first data included in the first symbol 220-a and the second data included in the second symbol 220-b of the message 210, and the UE 115-a may determine whether the message 210 includes a valid signal based on a known threshold. In some examples, the received signal y in the time domain at the k index of the time domain buffer may be a,0 ,y a,1 (e.g., a wideband signal) and a coarse received signal strength indicator (RSSI) for antenna a at symbols 0 and 1 (e.g., the first symbol 220-a and the second symbol 220-b)

[0074]

number

[0075] ,

[0076]

number

[0077] For symbols a, b, c, and c, the UE 115-a may calculate the correlation for each antenna a between these two symbols. For example, the UE 115-a may calculate the correlation using Equation 1.

[0078]

number

[0079] In some cases, correlation

[0080]

number

[0081] If {right arrow over (x)} satisfies a threshold (e.g., is below some threshold), the UE 115-a may determine that the first symbol 220-a and the second symbol 220-b exclude (e.g., do not include) a valid signal, such as a PSCCH message.

[0082]

number

[0083] If so, the UE 115-a may determine that there is no PSCCH included in the received message. The threshold may be pre-configured or configurable by the UE 115-a to provide the relatively lowest performance loss.

[0084] Additionally or alternatively, the UE 115-a may calculate a correlation for the received signal in the frequency domain. In particular, the UE 115-a may determine whether the message 210 includes data for the UE 115-a based on the correlation between the respective portions of the message in the frequency domain. Based at least in part on the result of the calculated frequency domain correlation, the UE 115-a may determine to enter a microsleep mode to conserve power (e.g., the result of the frequency domain correlation may indicate that the message 210 excludes valid data, data for the UE 115-a, or both).

[0085] The described techniques may be applied to wideband signals, which may avoid the UE 115-a from determining whether the message 210 includes valid data, for example, at a subband level. In such a case, the message 210 may include a wideband signal such that the message 210 is transmitted on a channel that meets a threshold bandwidth that is greater than the bandwidth of the subchannel. If a control channel (e.g., PSCCH) is not found in the first symbol 220-a or the second symbol 220-b (e.g., in the second symbol in the subframe), the UE 115-a may go into microsleep and may shut down (e.g., power down) the RF chain, the analog chain, the modem processing, or a combination thereof, for the remainder of the subframe 215 (which may have, for example, a total of 14 symbols 220 (e.g., OFDM symbols, symbol periods)). In some cases, the modem processing may include parameter estimation, channel and noise estimation, decoding, or other processing functions, which may be avoided when the UE 115-a is in a sleep state. Thus, the UE 115-a may stop modem processing in the second symbol 220-b, effectively conserving power that the UE 115-a may have available for the remaining 14 symbols 220 in the subframe 215.

[0086] In some examples, the first symbol 220-a (e.g., symbol 0) may be used for AGC convergence, the second symbol 220-b (e.g., symbol 1) may be used for PSCCH, and the PSCCH data in the second symbol 220-b may be duplicated in the first symbol 220-a. In some cases, when the AGC gain state remains the same between different subframes 215 (e.g., when the received power is unchanged), the UE 115-a may use the described technique when the first symbol 220-a and the second symbol 220-b carry duplicated signals. However, when the AGC gain state changes between different subframes 215 (e.g., when the power changes), the UE 115-a may use the remainder of the first symbol 220-a after AGC convergence. More specifically, the UE 115-a may perform AGC on the first symbol 220-a until AGC convergence during a first portion (e.g., the first portion) of the first symbol 220-a. The UE 115-a may then calculate a correlation between the data contained in the remaining portion of the first symbol 220-a and the data contained in the corresponding portion of the second symbol 220-b to determine whether to enter a sleep state.

[0087] In some cases, when performing the correlation calculation, the UE 115-a may assume that any impairments that may be applied to the signal, such as timing, frequency, or channel offsets, may be the same across the first symbol 220-a and the second symbol 220-b (e.g., because the first symbol 220-a and the second symbol 220-b are consecutive symbols 220), and may assume that the conjugate function (e.g., y a,1[k]) during the correlation calculation. In some cases, since data for the NR CV2X PSCCH may be duplicated on the first symbol 220-a and the second symbol 220-b, the UE 115-a may calculate the correlation excluding one or more DMRS symbol patterns. For example, using a DMRS-based approach, the UE 115-a may estimate the correct timing, frequency, and channel impairments, which may result in increased power consumption and signal degradation due to estimation errors. If the UE 115-a refrains from compensating for such impairments, signal performance may be significantly degraded. Thus, the UE 115-a may compensate for the impairments when calculating the correlation between the data included in the first symbol 220-a and the data included in the second symbol 220-b (e.g., using a conjugate function as shown in Equation 1). In some cases, since the UE 115-a performs correlation calculations on the same data that is one symbol 220 apart (e.g., because the first symbol 220-a and the second symbol 220-b are close to each other), the UE 115-a may lack the effect of Doppler spread (e.g., due to the speed of the vehicles in the CV2X system), which may result in a high correlation metric. In some cases, the described techniques may be combined with a DMRS-based approach, and the UE 115-a may identify a frequency-domain DMRS pattern associated with a message that the UE 115-a may use to further determine whether the message contains valid data for the UE 115-a. Thus, the UE 115-a may estimate time, frequency, and channel impairments on at least one symbol 220 per subframe 215.

[0088] The techniques described herein may enable the UE 115-a to conserve power and reduce heating, thus allowing the chip to avoid temperatures that may cause the chip to shut down. Compared to a DMRS-based approach in which the UE 115-a may calculate correlations per subchannel, the described techniques allow the UE 115-a to calculate correlations for the entire subframe 215 (e.g., wideband calculations), which may result in more processing gain. Additionally or alternatively, the UE 115-a may use the described techniques to skip modem processing entirely for both the PSCCH and the physical sidelink shared channel (PSSCH). That is, when the UE 115-a goes into microsleep, the UE 115-a may perform a simple correlation between two received symbols 220 and refrain from spending power on the other modem processing functions.

[0089] FIG. 3 illustrates an example of a process flow 300 supporting a wideband microsleep technique according to aspects of the disclosure. The process flow 300 may implement or be implemented by aspects of the wireless communication systems 100 and 200. For example, the process flow 300 may illustrate operations between a first UE 115-c and a second UE 115-d, which may be examples of corresponding devices described with reference to FIG. 1 and FIG. 2. In the following description of the process flow 300, the operations between the first UE 115-c and the second UE 115-d may be transmitted in a different order than the example order shown, or the operations performed by the first UE 115-c and the second UE 115-d may be performed in a different order or at different times. Some operations may also be omitted from the process flow 300, and other operations may be added to the process flow 300.

[0090] At 305, the first UE 115-c may receive a message from the second UE 115-d via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, and the first symbol period immediately precedes the second symbol period in the time domain. For example, the first and second symbol periods may be the first two symbols at the beginning of a subframe of the message. In some cases, the first UE 115-c may receive the message on a channel that meets a threshold bandwidth (e.g., wideband).

[0091] At 310, the first UE 115-c may calculate, for each antenna of the set of one or more antennas, a correlation between the first data included in the first symbol period and the second data included in the second symbol period of the message. In some cases, the correlation may be based on the received signal and an RSSI for at least one antenna of the set of one or more antennas.

[0092] At 315, the first UE 115-c may enter microsleep and power down at least one RF chain based at least in part on calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period, and the at least one RF chain is powered down based on the result of the calculated correlation satisfying a threshold. In some cases, the UE may power down at least one RF chain if the correlation is below a known threshold and therefore if the first two symbols lack associated data (e.g., control information, PSCCH).

[0093] The first UE 115-c may refrain from going into microsleep and may decode the relevant information in the message at 320. For example, the UE may refrain from powering down at least one RF chain if the correlation is above a known threshold and if the first two symbols contain relevant data (e.g., control information, PSCCH).

[0094] 4 illustrates a block diagram 400 of a device 405 supporting wideband microsleep techniques according to an aspect of the disclosure. The device 405 may be an example of an aspect of a UE 115 as described herein. The device 405 may include a receiver 410, a transmitter 415, and a communications manager 420. The device 405 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0095] The receiver 410 may provide a means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels related to wideband microsleep techniques). The information may be passed to other components of the device 405. The receiver 410 may utilize a single antenna or a set of multiple antennas.

[0096] The transmitter 415 may provide a means for transmitting signals generated by other components of the device 405. For example, the transmitter 415 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to wideband microsleep techniques). In some examples, the transmitter 415 may be co-located with the receiver 410 in a transceiver module. The transmitter 415 may utilize a single antenna or a set of multiple antennas.

[0097] The communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be examples of means for performing various aspects of the wideband microsleep techniques as described herein. For example, the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may support a method for performing one or more of the functions described herein.

[0098] In some examples, the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be implemented in hardware (e.g., in a communications management circuit). The hardware may include a processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof configured as or otherwise supporting a means for performing functions described in this disclosure. In some examples, the processor and a memory coupled to the processor may be configured to perform one or more of the functions described herein (e.g., by executing, by the processor, instructions stored in the memory).

[0099] Additionally or alternatively, in some examples, the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be implemented in code executed by a processor (e.g., as communications management software or firmware). When implemented in code executed by a processor, the functions of the communications manager 420, the receiver 410, the transmitter 415, or various combinations or components thereof may be performed by a general purpose processor, a DSP, a central processing unit (CPU), an ASIC, an FPGA, or any combination of these or other programmable logic devices (e.g., configured as or otherwise supporting a means for performing the functions described in this disclosure).

[0100] In some examples, the communications manager 420 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the receiver 410, the transmitter 415, or both. For example, the communications manager 420 may receive information from the receiver 410, send information to the transmitter 415, or be integrated in combination with the receiver 410, the transmitter 415, or both to receive information, transmit information, or perform various other operations as described herein.

[0101] The communications manager 420 may support wireless communications in a first UE according to examples as disclosed herein. For example, the communications manager 420 may be configured with or otherwise support a means for receiving a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, where the first symbol period immediately precedes the second symbol period in the time domain. The communications manager 420 may be configured with or otherwise support a means for calculating, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message. The communications manager 420 may be configured with or otherwise support a means for powering down at least one RF chain based on calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0102] By including or configuring the communications manager 420 according to examples as described herein, the device 405 (e.g., a processor controlling or possibly coupled to the receiver 410, the transmitter 415, the communications manager 420, or a combination thereof) can support techniques for wideband microsleep, which can reduce the amount of modem processing and subsequent power consumption and heating in the UE. Thus, the supported techniques can include improved network operation and, in some examples, can increase network efficiency, among other benefits.

[0103] 5 illustrates a block diagram 500 of a device 505 supporting wideband microsleep techniques according to an embodiment of the disclosure. The device 505 may be an example of an embodiment of a device 405 or a UE 115 as described herein. The device 505 may include a receiver 510, a transmitter 515, and a communications manager 520. The device 505 may also include a processor. Each of these components may be in communication with one another (e.g., via one or more buses).

[0104] The receiver 510 may provide a means for receiving information, such as packets, user data, control information, or any combination thereof, associated with various information channels (e.g., control channels, data channels, information channels related to wideband microsleep techniques). The information may be passed to other components of the device 505. The receiver 510 may utilize a single antenna or a set of multiple antennas.

[0105] The transmitter 515 may provide a means for transmitting signals generated by other components of the device 505. For example, the transmitter 515 may transmit information such as packets, user data, control information, or any combination thereof associated with various information channels (e.g., control channels, data channels, information channels related to wideband microsleep techniques). In some examples, the transmitter 515 may be co-located with the receiver 510 in a transceiver module. The transmitter 515 may utilize a single antenna or a set of multiple antennas.

[0106] The device 505, or various components thereof, may be an example of a means for performing various aspects of the wideband microsleep techniques as described herein. For example, the communications manager 520 may include a message receiving component 525, a correlation calculation component 530, a power component 535, or any combination thereof. The communications manager 520 may be an example of an aspect of the communications manager 420 as described herein. In some examples, the communications manager 520 or various components thereof may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the receiver 510, the transmitter 515, or both. For example, the communications manager 520 may receive information from the receiver 510, send information to the transmitter 515, or be integrated in combination with the receiver 510, the transmitter 515, or both to receive information, transmit information, or perform various other operations as described herein.

[0107] The communications manager 520 may support wireless communications in a first UE according to examples as disclosed herein. The message receiving component 525 may be configured as or otherwise support a means for receiving a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, where the first symbol period immediately precedes the second symbol period in the time domain. The correlation calculation component 530 may be configured as or otherwise support a means for calculating, for each antenna of the set of one or more antennas, a correlation between a first data included in the first symbol period and a second data included in the second symbol period of the message. The power component 535 may be configured as or otherwise support a means for powering down at least one RF chain based on calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0108] FIG. 6 illustrates a block diagram 600 of a communications manager 620 supporting wideband microsleep techniques according to aspects of the disclosure. Communications manager 620 may be an example of aspects of communications manager 420, communications manager 520, or both, as described herein. Communications manager 620, or various components thereof, may be an example of a means for performing various aspects of wideband microsleep techniques as described herein. For example, communications manager 620 may include a message reception component 625, a correlation calculation component 630, a power component 635, an AGC component 640, a DMRS component 645, a modem processing component 650, or any combination thereof. Each of these components may communicate with one another directly or indirectly (e.g., via one or more buses).

[0109] The communications manager 620 may support wireless communications in a first UE according to examples as disclosed herein. The message receiving component 625 may be configured as or otherwise support a means for receiving a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, where the first symbol period immediately precedes the second symbol period in the time domain. The correlation calculation component 630 may be configured as or otherwise support a means for calculating, for each antenna of the set of one or more antennas, a correlation between a first data included in the first symbol period and a second data included in the second symbol period of the message. The power component 635 may be configured as or otherwise support a means for powering down at least one RF chain based on calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0110] In some examples, to support receiving a message from the second UE, the message receiving component 625 may be configured with or otherwise support a means for receiving a message on a channel that meets a threshold bandwidth, where a correlation between first data included in a first symbol period and second data included in a second symbol period is calculated for the channel that meets the threshold bandwidth.

[0111] In some examples, to support calculating a correlation between first data included in a first symbol period and second data included in a second symbol period of a message, correlation calculation component 630 may be configured as or otherwise support a means for calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period based on the RSSI for at least one antenna of the set of one or more antennas.

[0112] In some examples, to support powering down at least one RF chain based on calculating the correlation, power component 635 may be configured with or otherwise support a means for powering down at least one RF chain for one or more additional symbol periods of the message, where the one or more additional symbol periods are after the second symbol period in the time domain.

[0113] In some examples, the modem processing component 650 may be configured as or otherwise support a means for powering down modem processing based on the result of the calculated correlation satisfying a threshold, where modem processing includes parameter estimation, channel and noise estimation, decoding, or any combination thereof.

[0114] In some examples, the power component 635 may be configured with or otherwise support a means for determining, based on the calculated correlation result satisfying a threshold, that the first symbol period and the second symbol period exclude control information, and at least one RF chain is powered down based on the determination.

[0115] In some examples, the AGC component 640 may be configured or otherwise support a means for performing AGC based at least in part on receiving a message, where the same gain state is associated with the message and a second message received prior to the message. In some examples, the AGC component 640 may be configured or otherwise support a means for applying the same gain state to a first symbol period and a second symbol period of the message.

[0116] In some examples, the AGC component 640 may be configured or otherwise support a means for determining that a gain state has changed based on receiving a message and a second message received prior to the message. In some examples, the AGC component 640 may be configured or otherwise support a means for performing AGC on the received message in response to determining that a gain state has changed, where the AGC may be based on an initial portion of a first symbol period (e.g., until convergence). In such a case, the correlation between the first data included in the first symbol period and the second data included in the second symbol period may be based on the first data included in the remaining portion of the first symbol period (e.g., after convergence) and a corresponding portion of the second symbol period, where the remaining portion of the first symbol period may be different from the initial portion of the first symbol period.

[0117] In some examples, to support computing a correlation between first data included in a first symbol period and second data included in a second symbol period of a message, the DMRS component 645 may be configured as or otherwise support a means for computing the correlation except for one or more DMRS symbol patterns.

[0118] In some examples, the DMRS component 645 may be configured with or otherwise support a means for determining a DMRS pattern in the frequency domain across two or more symbols of a message, where at least one RF chain is powered down based on the determined DMRS pattern and a result of a calculated correlation satisfying a threshold.

[0119] In some examples, the at least one RF chain is powered down based on the calculated correlation result being less than a threshold. In some examples, the first symbol period and the second symbol period are received at the beginning of the message.

[0120] FIG. 7 illustrates a diagram of a system 700 including a device 705 supporting wideband microsleep techniques according to aspects of the disclosure. The device 705 may be an example of or may include components of a device 405, a device 505, or a UE 115 as described herein. The device 705 may wirelessly communicate with one or more base stations 105, a UE 115, or any combination thereof. The device 705 may include components for two-way voice and data communication, including components for transmitting and receiving communications, such as a communications manager 720, an input / output (I / O) controller 710, a transceiver 715, an antenna 725, a memory 730, code 735, and a processor 740. These components may be in electronic communication or may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) in some cases via one or more buses (e.g., a bus 745).

[0121] The I / O controller 710 may manage input and output signals for the device 705. The I / O controller 710 may also manage peripheral devices that are not integrated into the device 705. In some cases, the I / O controller 710 may represent a physical connection or port to an external peripheral device. In some cases, the I / O controller 710 may utilize an operating system, such as iOS®, ANDROID®, MS-DOS®, MS-WINDOWS®, OS / 2®, UNIX®, LINUX®, or another known operating system. Additionally or alternatively, the I / O controller 710 may represent or interact with a modem, keyboard, mouse, touch screen, or similar device. In some cases, the I / O controller 710 may be implemented as part of a processor, such as the processor 740. In some cases, a user may interact with the device 705 through the I / O controller 710 or through hardware components controlled by the I / O controller 710.

[0122] In some cases, the device 705 may include a single antenna 725. However, in some other cases, the device 705 may have two or more antennas 725 that may be capable of simultaneously transmitting or receiving multiple wireless transmissions. The transceiver 715 may communicate bidirectionally via one or more antennas 725, wired links, or wireless links as described herein. For example, the transceiver 715 may represent a wireless transceiver and may communicate bidirectionally with another wireless transceiver. The transceiver 715 may also include a modem for modulating packets and providing the modulated packets to one or more antennas 725 for transmission and demodulating packets received from the one or more antennas 725. The transceiver 715, or the transceiver 715 and one or more antennas 725, may be an example of a transmitter 415, a transmitter 515, a receiver 410, a receiver 510, or any combination or components thereof as described herein.

[0123] The memory 730 may include random access memory (RAM) and read only memory (ROM). The memory 730 may store computer-readable computer-executable code 735 that includes instructions that, when executed by the processor 740, cause the device 705 to perform various functions described herein. The code 735 may be stored in a non-transitory computer-readable medium, such as a system memory or another type of memory. In some cases, the code 735 may not be directly executable by the processor 740, but may (e.g., when compiled and executed) cause a computer to perform functions described herein. In some cases, the memory 730 may include a basic I / O system (BIOS) that may control basic hardware or software operations, such as interaction with peripheral components or devices, among other things.

[0124] The processor 740 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, a microcontroller, an ASIC, an FPGA, a programmable logic device, a discrete gate or transistor logic component, a discrete hardware component, or any combination thereof). In some cases, the processor 740 may be configured to operate a memory array using a memory controller. In some other cases, the memory controller may be integrated into the processor 740. The processor 740 may be configured to execute computer-readable instructions stored in a memory (e.g., memory 730) to cause the device 705 to perform various functions (e.g., functions or tasks supporting wideband microsleep techniques). For example, the device 705 or a component of the device 705 may include a processor 740 and a memory 730 coupled to the processor 740, where the processor 740 and the memory 730 are configured to perform various functions described herein.

[0125] Communications manager 720 may support wireless communications at a first UE according to examples as disclosed herein. For example, communications manager 720 may be configured with or otherwise support a means for receiving a message from a second UE via a set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, where the first symbol period immediately precedes the second symbol period in the time domain. Communications manager 720 may be configured with or otherwise support a means for calculating, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message. Communications manager 720 may be configured with or otherwise support a means for powering down at least one RF chain based on calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold.

[0126] By including or configuring a communications manager 720 according to examples as described herein, the device 705 can support techniques for wideband microsleep, which can reduce the amount of modem processing and subsequent power consumption and heating in the UE. Thus, the supported techniques can include improved network operation and, in some examples, can increase network efficiency, among other benefits.

[0127] In some examples, the communications manager 720 may be configured to perform various operations (e.g., receiving, monitoring, transmitting) using or otherwise cooperating with the transceiver 715, the one or more antennas 725, or any combination thereof. Although the communications manager 720 is shown as a separate component, in some examples, one or more functions described with reference to the communications manager 720 may be supported or performed by the processor 740, the memory 730, the code 735, or any combination thereof. For example, the code 735 may include instructions executable by the processor 740 to cause the device 705 to perform various aspects of the wideband microsleep techniques as described herein, or the processor 740 and the memory 730 may be otherwise configured to perform or support such operations.

[0128] FIG. 8 illustrates a flow chart illustrating a method 800 for supporting wideband microsleep techniques according to aspects of the disclosure. The operations of method 800 may be implemented by a UE or components thereof as described herein. For example, the operations of method 800 may be performed by a UE 115 as described with reference to FIGS. 1-7. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described functions.

[0129] At 805, the method may include receiving a message from a second UE via the set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain. The operations of 805 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 805 may be performed by a message receiving component 625 as described with reference to FIG.

[0130] At 810, the method may include calculating, for each antenna of the set of one or more antennas, a correlation between first data included in a first symbol period and second data included in a second symbol period of the message. The operations of 810 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 810 may be performed by a correlation calculation component 630 as described with reference to FIG.

[0131] At 815, the method may include powering down at least one RF chain based on calculating a correlation between first data included in the first symbol period and second data included in the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold. The operations of 815 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 815 may be performed by power component 635 as described with reference to FIG.

[0132] FIG. 9 illustrates a flow chart illustrating a method 900 for supporting wideband microsleep techniques according to aspects of the disclosure. The operations of the method 900 may be implemented by a UE or components thereof as described herein. For example, the operations of the method 900 may be performed by the UE 115 as described with reference to FIGS. 1-7. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described functions.

[0133] At 905, the method may include receiving a message from a second UE via the set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain. The operations of 905 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 905 may be performed by a message receiving component 625 as described with reference to FIG.

[0134] At 910, the method may include calculating a correlation between first data included in a first symbol period and second data included in a second symbol period based on the RSSI for at least one antenna of the set of one or more antennas. The operations of 910 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 910 may be performed by a correlation calculation component 630 as described with reference to FIG.

[0135] At 915, the method may include powering down at least one RF chain based on calculating a correlation between first data included in the first symbol period and second data included in the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold. The operations of 915 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 915 may be performed by power component 635 as described with reference to FIG.

[0136] At 920, the method may include powering down modem processing based on the calculated correlation result satisfying a threshold, the modem processing including parameter estimation, channel and noise estimation, decoding, or any combination thereof. The operations of 920 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 920 may be performed by modem processing component 650 as described with reference to FIG.

[0137] FIG. 10 illustrates a flow chart illustrating a method 1000 for supporting wideband microsleep techniques according to aspects of the disclosure. The operations of method 1000 may be implemented by a UE or components thereof as described herein. For example, the operations of method 1000 may be performed by a UE 115 as described with reference to FIGS. 1-7. In some examples, the UE may execute a set of instructions to control functional elements of the UE to perform the described functions. Additionally or alternatively, the UE may use dedicated hardware to perform aspects of the described functions.

[0138] At 1005, the method may include receiving a message from a second UE via the set of one or more antennas, where a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain. The operations of 1005 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1005 may be performed by a message receiving component 625 as described with reference to FIG. 6.

[0139] At 1010, the method may include performing AGC based at least in part on receiving a message, where the same gain state is associated with the message and a second message received prior to the message. The operations of 1010 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1010 may be performed by AGC component 640 as described with reference to FIG.

[0140] At 1015, the method may include applying the same gain state to a first symbol period and a second symbol period of the message. The operations of 1015 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1015 may be performed by AGC component 640 as described with reference to FIG.

[0141] At 1020, the method may include calculating, for each antenna of the set of one or more antennas, a correlation between first data included in a first symbol period and second data included in a second symbol period of the message. The operations of 1020 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1020 may be performed by a correlation calculation component 630 as described with reference to FIG.

[0142] At 1025, the method may include powering down at least one RF chain based on calculating a correlation between first data included in the first symbol period and second data included in the second symbol period, where the at least one RF chain is powered down based on a result of the calculated correlation satisfying a threshold. The operations of 1025 may be performed according to examples as disclosed herein. In some examples, aspects of the operations of 1025 may be performed by power component 635 as described with reference to FIG.

[0143] The following provides a summary of aspects of the disclosure.

[0144] Aspect 1: A method for wireless communication in a first UE, the method comprising: receiving a message from a second UE via a set of one or more antennas, wherein a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain; calculating, for each antenna of the set of one or more antennas, a correlation between first data included in the first symbol period and second data included in the second symbol period of the message; and powering down at least one RF chain based at least in part on calculating the correlation between the first data included in the first symbol period and the second data included in the second symbol period, wherein the at least one RF chain is powered down based at least in part on a result of the calculated correlation satisfying a threshold.

[0145] Aspect 2: The method of aspect 1, wherein the step of receiving a message from the second UE includes a step of receiving the message on a channel that meets a threshold bandwidth, and a correlation between first data included in the first symbol period and second data included in the second symbol period is calculated for the channel that meets the threshold bandwidth.

[0146] Aspect 3: The method of any of aspects 1 to 2, wherein the step of calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period of the message includes a step of calculating a correlation between the first data included in the first symbol period and the second data included in the second symbol period based at least in part on an RSSI for at least one antenna of the set of one or more antennas.

[0147] Aspect 4: The method of any of aspects 1-3, wherein the step of powering down at least one RF chain based at least in part on calculating the correlation includes a step of powering down the at least one RF chain for one or more additional symbol periods of the message, where the one or more additional symbol periods are after the second symbol period in the time domain.

[0148] Aspect 5: The method of aspect 4, further comprising the step of powering off modem processing based at least in part on the calculated correlation result satisfying a threshold, the modem processing including parameter estimation, channel and noise estimation, decoding, or any combination thereof.

[0149] Aspect 6: The method of any of aspects 1-5, further comprising: determining, based at least in part on the calculated correlation result satisfying a threshold, that the first symbol period and the second symbol period exclude control information, and wherein at least one RF chain is powered down based at least in part on the determination.

[0150] Aspect 7: The method of any of aspects 1-6, further comprising: performing AGC based at least in part on receiving a message, where the same gain state is associated with the message and a second message received prior to the message; and applying the same gain state to a first symbol period and a second symbol period of the message.

[0151] Aspect 8: The method of any of aspects 1-7, further comprising: determining that a gain state has changed based at least in part on receiving the message and a second message received prior to the message; and performing AGC on the received message in response to determining that the gain state has changed, wherein the AGC is based at least in part on a first portion of a first symbol period and a correlation between first data included in the first symbol period and second data included in the second symbol period is based at least in part on the first data included in a remainder of the first symbol period and a corresponding portion of the second symbol period, wherein the remainder of the first symbol period is different from the first portion.

[0152] Aspect 9: The method of any of aspects 1-8, wherein the step of calculating the correlation between first data included in a first symbol period and second data included in a second symbol period of the message includes a step of calculating the correlation excluding one or more DMRS symbol patterns.

[0153] Aspect 10: The method of any of aspects 1-8, further comprising a step of determining a DMRS pattern in the frequency domain across two or more symbols of the message, wherein at least one RF chain is powered down based at least in part on the determined DMRS pattern and a result of the calculated correlation satisfying a threshold.

[0154] Example 11: The method of any of Examples 1-10, wherein at least one RF chain is powered down based at least in part on a result of the calculated correlation being less than a threshold.

[0155] Example 12: The method of any of Examples 1-11, wherein the first symbol period and the second symbol period are received at the beginning of a message.

[0156] Aspect 13: An apparatus for wireless communication in a first UE, comprising: a processor; a memory coupled to the processor; and instructions stored in the memory and executable by the processor to cause the apparatus to perform any of the methods of aspects 1-12.

[0157] Example 14: An apparatus for wireless communication in a first UE, comprising at least one means for performing the method of any of Examples 1-12.

[0158] Aspect 15: A non-transitory computer-readable medium storing code for wireless communication in a first UE, the code including instructions executable by a processor to perform any of the methods of aspects 1-12.

[0159] It should be noted that the methods described herein represent possible implementations, that the acts and steps may be rearranged or otherwise modified, and that other implementations are possible. Additionally, aspects from two or more of the methods may be combined.

[0160] Although aspects of LTE, LTE-A, LTE-A Pro, or NR systems may be described as examples, and LTE, LTE-A, LTE-A Pro, or NR terminology may be used throughout much of the description, the techniques described herein may be applicable to other than LTE, LTE-A, LTE-A Pro, or NR networks. For example, the techniques described may be applicable to various other wireless communication systems, such as Ultra Mobile Broadband (UMB), Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Flash-OFDM, and other systems and radio technologies not explicitly mentioned herein.

[0161] The information and signals described herein may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referred to throughout the description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0162] The various example blocks and components described with respect to the disclosure herein may be implemented or performed using a general purpose processor, a DSP, an ASIC, a CPU, an FPGA or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but alternatively, the processor may be any processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices (e.g., a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration).

[0163] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. When implemented in software executed by a processor, the functions may be stored on or transmitted via a computer-readable medium as one or more instructions or codes. 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 may be implemented using software executed by a processor, hardware, firmware, hardwiring, or any combination thereof. Features implementing the functions may also be physically located in various locations, including being distributed such that parts of the functions are implemented in various physical locations.

[0164] Computer-readable media includes both non-transitory computer storage media and communication media, including any medium that facilitates transfer of a computer program from one place to another. Non-transitory storage media may be any available medium that can be accessed by a general purpose or special purpose computer. By way of example, and not limitation, non-transitory computer-readable media may include RAM, ROM, Electrically Erasable Programmable ROM (EEPROM), Flash memory, Compact Disk (CD) ROM or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other non-transitory medium that can be used to carry or store desired program code means 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. Also, any connection is properly termed a computer-readable medium. For example, if the 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, the coaxial cable, fiber optic cable, twisted pair, DSL, or wireless technologies such as infrared, radio, and microwave are included within the definition of computer readable media. As used herein, disk and disc include CD, laser disc, optical disc, digital versatile disc (DVD), floppy disk, and Blu-ray disc, where disks typically reproduce data magnetically and discs reproduce data optically using lasers. Combinations of the above are also included within the scope of computer readable media.

[0165] As used herein, including in the claims, "or" used in a list of items (e.g., a list of items ending with a phrase such as "at least one of" or "one or more of") indicates an inclusive list, such as, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, the phrase "based on" as used herein should not be construed as a reference to a closed set of conditions. For example, an exemplary step described as "based on condition A" may be based on both condition A and condition B without departing from the scope of the present disclosure. In other words, the phrase "based on" as used herein should be construed similarly to the phrase "based at least in part on."

[0166] The term "determine" or "determining" encompasses a wide variety of actions, and thus "determining" can include calculating, computing, processing, deriving, investigating, looking up (such as by looking up in a table, database, or another data structure), ascertaining, etc. "Determining" can also include receiving (such as receiving information), accessing (such as accessing data in a memory), etc. "Determining" can also include resolving, selecting, choosing, establishing, and other such similar actions.

[0167] In the accompanying figures, similar components or features may have the same reference label. Furthermore, various components of the same type may be distinguished by following the reference label with a dash and a second label that distinguishes the similar components. If only a first reference label is used herein, the description is applicable to any of the similar components having the same first reference label, regardless of the second reference label or other subsequent reference labels.

[0168] The description set forth herein with respect to the accompanying drawings describes exemplary configurations and does not represent every example that may be implemented or fall within the scope of the claims. The term "example" as used herein means "serving as an example, instance, or illustration" and does not mean "preferred" or "advantageous over other examples." The detailed description includes specific details for the purposes of providing an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some instances, known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0169] The description herein is provided to enable any person skilled in the art to make or use the present disclosure. Various modifications of the present disclosure will be apparent to those skilled in the art, and the general principles defined herein may be applied to other variations without departing from the scope of the present disclosure. Thus, the present disclosure is not limited to the examples and designs described herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. [Explanation of symbols]

[0170] 100 Wireless communication system 105 Base station 110 Coverage Area, Geographical Coverage Area 115 UE 115-a UE 115-b UE 115-c First UE 115-d Second UE 120 backhaul links 125 Communication Links 130 Core Network 135 D2D communication links 140 Access Network Entity 145 Access Network Transmission Entity 150 IP Services 200 Wireless Communication System 205-a Sidelink communication link 205-b Sidelink communication link 210 Messages 215 Subframe 220 Symbols 220-a First Symbol 220-b Second Symbol 300 Process Flow 400 Block Diagram 405 Devices 410 Receiver 415 Transmitter 420 Communications Manager 500 Block Diagram 505 Devices 510 Receiver 515 Transmitter 520 Communications Manager 525 Message Receiving Component 530 Correlation Calculation Components 535 Power Components 600 Block Diagram 620 Communications Manager 625 Message Receiving Component 630 Correlation Calculation Components 635 Power Components 640 AGC components 645 DMRS Components 650 Modem Processing Components 700 System 705 Devices 710 I / O Controller 715 Transceiver 720 Communications Manager 725 Antenna 730 Memory 735 Code 740 Processor 745 Bus 800 ways 900 ways 1000 ways

Claims

1. 1. A method for wireless communication in a first user equipment (UE), comprising: receiving a message from a second UE via a set of one or more antennas, wherein a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain; calculating, for each antenna in the set of one or more antennas, a correlation between first data in the first symbol period and second data in the second symbol period of the message; powering down at least one radio frequency chain based at least in part on a result of the calculated correlation satisfying a threshold; A method comprising:

2. receiving the message from the second UE, receiving the message over a channel that meets a threshold bandwidth, wherein the correlation between the first data included in the first symbol period and the second data included in the second symbol period is calculated for the channel that meets the threshold bandwidth; 2. The method of claim 1, comprising:

3. calculating the correlation between the first data included in the first symbol period and the second data included in the second symbol period of the message, calculating the correlation between the first data included in the first symbol period and the second data included in the second symbol period based at least in part on a received signal strength indicator for at least one antenna of the set of one or more antennas.

2. The method of claim 1, comprising: powering down the at least one radio frequency chain based at least in part on the result of the calculated correlation satisfying the threshold, powering down the at least one radio frequency chain for one or more additional symbol periods of the message, the one or more additional symbol periods being after the second symbol period in the time domain; 2. The method of claim 1, comprising:

5. powering down modem processing based at least in part on the result of the calculated correlation satisfying the threshold, the modem processing including parameter estimation, channel and noise estimation, decoding, or any combination thereof.

5. The method of claim 4, further comprising:

6. determining, based at least in part on the result of the calculated correlation satisfying the threshold, that the first symbol period and the second symbol period exclude control information, and wherein the at least one radio frequency chain is powered down based at least in part on the determination. The method of claim 1, further comprising:

7. performing automatic gain control based at least in part on receiving the message, wherein the same gain state is associated with the message and a second message received prior to the message; applying the same gain state to the first symbol period and the second symbol period of the message; The method of claim 1, further comprising:

8. determining that a gain state has changed based at least in part on receiving the message and a second message received prior to the message; performing automatic gain control on the received message in response to the determining that the gain state has changed, the automatic gain control being based at least in part on a first portion of the first symbol period, the correlation between the first data in the first symbol period and the second data in the second symbol period being based at least in part on the first data in a remainder of the first symbol period and a corresponding portion of the second symbol period, the remainder of the first symbol period being different from the first portion; The method of claim 1, further comprising:

9. calculating the correlation between the first data included in the first symbol period and the second data included in the second symbol period of the message, calculating said correlation excluding one or more demodulation reference signal symbol patterns.

2. The method of claim 1, comprising:

10. determining a demodulation reference signal pattern in the frequency domain across two or more symbols of the message, wherein the at least one radio frequency chain is powered down based at least in part on the determined demodulation reference signal pattern and the result of the calculated correlation satisfying the threshold. The method of claim 1, further comprising:

11. The method of claim 1 , wherein the at least one radio frequency chain is powered down based at least in part on the result of the calculated correlation being less than the threshold.

12. The method of claim 1 , wherein the first symbol period and the second symbol period are received at a beginning of the message.

13. An apparatus for wireless communication in a first user equipment (UE), comprising: means for receiving a message from a second UE via a set of one or more antennas, wherein a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain; means for calculating, for each antenna in the set of one or more antennas, a correlation between first data in the first symbol period and second data in the second symbol period of the message; means for powering down at least one radio frequency chain based at least in part on a result of the calculated correlation satisfying a threshold; An apparatus comprising:

14. The apparatus of claim 13, further comprising means for carrying out the method of any one of claims 2 to 12.

15. 1. A non-transitory computer-readable medium having stored thereon code for wireless communication in a first user equipment (UE), the code comprising: receiving, via a set of one or more antennas, a message from a second UE, wherein a first symbol period and a second symbol period of the message include a replicated signal, the first symbol period immediately preceding the second symbol period in the time domain; calculating, for each antenna in the set of one or more antennas, a correlation between first data in the first symbol period and second data in the second symbol period of the message; powering down at least one radio frequency chain based at least in part on a result of the calculated correlation satisfying a threshold; A non-transitory computer-readable storage medium comprising instructions executable by a processor to perform the steps of:

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