Transmission pattern configurations for low power synchronization signals

Abstract

Various aspects of the present disclosure relate to transmission pattern configuration for low power synchronization signals. A device with a low power processor and / or a user equipment (UE) with a main radio and a low power radio may receive first signaling including a low power synchronization signal and a portion of a cell identifier (ID) for a serving cell. The first signaling may be transmitted using a transmission pattern associated with an index modulation scheme (e.g., an on-off keying (OOK) waveform). The device may receive second signaling including an indication of a remaining portion of the cell ID. The device may use the cell ID to establish a wireless connection with a network equipment (NE), such as a base station.

Description

TRANSMISSION PATTERN CONFIGURATIONS FOR EOW POWER SYNCHRONIZATION SIGNAESRELATED APPLICATION

[0001] This application claims priority to U.S. Provisional Application Serial No. 63 / 603,801 filed November 29, 2023, entitled “TRANSMISSION PATTERN CONFIGURATIONS FOR LOW POWER SYNCHRONIZATION SIGNALS,” the disclosure of which is incorporated by reference herein in its entirety.TECHNICAL FIELD

[0002] The present disclosure relates to wireless communications, and more specifically to low power synchronization signal transmission and reception.BACKGROUND

[0003] A wireless communications system may include one or multiple network communication devices, such as base stations, which may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE), or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers, or the like)). Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G)).SUMMARY

[0004] An article “a” before an element is unrestricted and understood to refer to “at least one” of those elements or “one or more” of those elements. The terms “a,” “at least one,” “one or more,” and “at least one of one or more” may be interchangeable. As used herein, including in the claims, “or” as used in a list of items (e.g., a list of items prefaced by a phrase such as “at least one of’ or“one or more of’ or “one or both of’) indicates an inclusive list such that, for example, a list of at least one of A, B, or C means A or B or C or AB or AC or BC or ABC (i.e., A and B and C). Also, as used herein, the phrase “based on” shall not be construed as a reference to a closed set of conditions. For example, an example step that is described as “based on condition A” may be based on both a condition A and a condition B without departing from the scope of the present disclosure. In other words, as used herein, the phrase “based on” shall be construed in the same manner as the phrase “based at least in part on.” Further, as used herein, including in the claims, a “set” may include one or more elements.

[0005] Some implementations of the method and apparatuses described herein may further include a low power processor for wireless communication to receive first signaling including a low power synchronization signal and a portion of a cell identifier (ID) associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme, such as on-off keying (OOK), frequency shift keying (FSK), phase shift keying (PSK), minimum shift keying (MSK) etc., and to receive second signaling including an indication of a remaining portion of the cell ID.

[0006] In some implementations of the method and apparatuses described herein, the low power processor determines the first signaling corresponds to the transmission pattern based on comparing the transmission pattern to a set of transmission patterns, the set of transmission patterns preconfigured at the low power processor. The low power processor receives, prior to receiving the first signaling, third signaling indicating the transmission pattern. The low power processor receives, prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. In some examples, to receive one or more of the first signaling or the second signaling, the low power processor receives one or more bits indicating a starting transmission frame of the one or more of the first signaling or the second signaling. In some other examples, to receive one or more of the first signaling or the second signaling, the low power processor receives one or more bits indicating an ending transmission frame of the one or more of the first signaling or the second signaling. The low power processor receives, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble and demodulates the payload based on the one or more bits indicating the start or the end of the preamble. The low powerprocessor detects the preamble based on correlating a sequence of the data transmission with the transmission pattern. The low power synchronization signal is a low power-primary synchronization signal (LP-PSS) and the second signaling includes a low power-secondary synchronization signal (LP-SSS). The second signaling includes one or more of a wake-up signal (WUS) or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a time division duplex (TDD) configuration. The second signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic low power synchronization signal. The low power synchronization signal includes an on-demand low power synchronization signal. One or more of the first signaling or the second signaling indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0007] Some implementations of the method and apparatuses described herein may further include a UE for wireless communication, the UE including a low power radio, at least one memory, and at least one processor to receive, via the low power radio, first signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme and receive second signaling including an indication of a remaining portion of the cell ID.

[0008] In some implementations of the method and apparatuses described herein, the UE further includes a main radio and receives, via the main radio and prior to receiving the first signaling, third signaling indicating a mapping between one or more synchronization signals and a set of transmission patterns including the transmission pattern and determine the first signaling corresponds to the transmission pattern based on the mapping. The UE further includes a main radio and receives, via the main radio and prior to receiving the first signaling, third signaling indicating the transmission pattern. The UE further includes a main radio and receives, via the main radio and prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. The UE indicates the transmission pattern to the low power radio.

[0009] In some implementations of the method and apparatuses described herein, the method further includes receiving first signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme and receiving second signaling including an indicationof a remaining portion of the cell ID. The method further includes determining the first signaling corresponds to the transmission pattern based on comparing the transmission pattern to a set of transmission patterns, the set of transmission patterns preconfigured at the low power processor. The method further includes receiving, prior to receiving the first signaling, third signaling indicating the transmission pattern. The method further includes receiving, prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. To receive one or more of the first signaling or the second signaling, the method further includes receiving one or more bits indicating a starting transmission frame of the one or more of the first signaling or the second signaling. To receive one or more of the first signaling or the second signaling, the method further includes receiving one or more bits indicating an ending transmission frame of the one or more of the first signaling or the second signaling. The method further includes receiving, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble and demodulating the payload based on the one or more bits indicating the start or the end of the preamble. The method further includes detecting the preamble based on correlating a sequence of the data transmission with the transmission pattern. The low power synchronization signal is a LP-PSS and the second signaling includes a LP-SSS. The second signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The second signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic low power synchronization signal. The low power synchronization signal includes an on-demand low power synchronization signal. One or more of the first signaling or the second signaling indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0010] Some implementations of the method and apparatuses described herein may further include a base station for wireless communication to transmit first signaling indicating a set of transmission patterns associated with an index modulation scheme, transmit second signaling based on selecting a transmission pattern of the set of transmission patterns, the second signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, and transmit third signaling including an indication of a remaining portion of the cell ID.

[0011] In some implementations of the method and apparatuses described herein, the base station transmits, prior to transmitting the first signaling, fourth signaling indicating the transmission pattern. The base station transmits, prior to transmitting the first signaling, fourth signaling indicating a mapping between one or more synchronization signals and the set of transmission patterns. To transmit one or more of the second signaling or the third signaling, the base station transmits one or more bits indicating a starting transmission frame of the one or more of the second signaling or the third signaling. To transmit one or more of the second signaling or the third signaling, the base station transmits one or more bits indicating an ending transmission frame of the one or more of the second signaling or the third signaling. The base station transmits, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble. The low power synchronization signal is a LP-PSS and the third signaling includes a LP-SSS. The third signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The third signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic synchronization signal. The low power synchronization signal includes an on-demand synchronization signal. One or more of the second signaling or the third signaling indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0012] Some implementations of the method and apparatuses described herein may further include a method performed by a base station, the method including transmitting first signaling indicating a set of transmission patterns associated with an index modulation scheme, transmitting second signaling based on selecting a transmission pattern of the set of transmission patterns, the second signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, and transmitting third signaling including an indication of a remaining portion of the cell ID.

[0013] In some implementations of the method and apparatuses described herein, the method further includes transmitting, prior to transmitting the first signaling, fourth signaling indicating the transmission pattern. The method further includes transmitting, prior to transmitting the first signaling, fourth signaling indicating a mapping between one or more synchronization signals and the set of transmission patterns. To transmit one or more of the second signaling or the thirdsignaling, the method further includes transmitting one or more bits indicating a starting transmission frame of the one or more of the second signaling or the third signaling. To transmit one or more of the second signaling or the third signaling, the method further includes transmitting one or more bits indicating an ending transmission frame of the one or more of the second signaling or the third signaling. The method further includes transmitting, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble. The low power synchronization signal is a LP-PSS and the third signaling includes a LP-SSS. The third signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The third signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic synchronization signal. The low power synchronization signal includes an on-demand synchronization signal. One or more of the second signaling or the third signaling indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figures 1 through 3 illustrate examples of wireless communications systems in accordance with aspects of the present disclosure.

[0015] Figures 4 through 7 illustrate examples of transmission diagrams in accordance with aspects of the present disclosure.

[0016] Figures 8 and 9 illustrate examples of process flows, in accordance with aspects of the present disclosure.

[0017] Figure 10 illustrates an example of a UE in accordance with aspects of the present disclosure.

[0018] Figure 11 illustrates an example of a processor in accordance with aspects of the present disclosure.

[0019] Figure 12 illustrates an example of a network equipment (NE) in accordance with aspects of the present disclosure.

[0020] Figure 13 illustrates a flowchart of a method performed by a low power processor in accordance with aspects of the present disclosure.

[0021] Figure 14 illustrates a flowchart of a method performed by a UE in accordance with aspects of the present disclosure.

[0022] Figure 15 illustrates a flowchart of a method performed by an NE in accordance with aspects of the present disclosure.DETAILED DESCRIPTION

[0023] A UE and a NE, such as a base station, in a wireless communications system can communicate using time-frequency resources. To synchronize the timing and frequency of the communications, the UE and the NE exchange synchronization signals. The synchronization signals may include a primary synchronization signal (PSS) for initial cell search and identification and one or more secondary synchronization signals (SSSs) to provide additional information about a cell identity group. A UE can utilize the synchronization signals to determine a unique ID assigned to a cell in the network that sent the synchronization signals, referred to as a cell ID. The synchronization signals provide for a UE to perform an initial cell search, identify a serving cell, and establish a reliable connection with the network.

[0024] In some examples, a UE or other wireless device may be a low power wireless device and therefore may be designed to operate with relatively low power consumption. A low power wireless device may operate using reduced transmission and / or reception capabilities (due to reduced transmit power, energy efficient radio transceivers, low power processors, etc.), may perform energy harvesting techniques to supplement battery power, may utilize sleep modes for different components of the wireless device, or the like. Examples of low power wireless devices include, but are not limited to, internet of things (loT) devices, wearable devices, remote sensor devices, and mobile devices. In some examples, a low power wireless device may be unable to monitor for, receive, and / or decode a synchronization signal transmission from a NE. For example, the low power wireless device may have a reduced receiver range, may be unable to process a synchronization signal due to reduced processing capabilities, may have a reduced power budget for active monitoring for transmissions, among other factors. A low power wireless device failing to receive a synchronization signal may result in inefficient communications due to increasedsignaling related to cell search and selection failures, network entry and handover failure, reduced network efficiency, connection instability, and the like. Further, a low power wireless device failing to receive the synchronization signal may result in increased power consumption at the low power wireless device due to the wireless device continuously attempting to perform synchronization with the network without success.

[0025] As described herein, a low power wireless device may receive signaling including a low power synchronization signal that is sent using a transmission pattern from a set of defined transmission patterns. The synchronization signal is low power in that the signal is modulated according to an index modulation scheme, in which indices of elements of a transmission (e.g., subcarriers, antennas, or time slots) convey information in addition to the information indicated by other modulation parameters (e.g., amplitude or phase). In some examples, a NE, such as a base station, may configure the set of defined transmission patterns at the low power wireless device. For example, if the low power wireless device is a UE with a main radio and a low power radio, the NE may transmit an indication of the transmission patterns to the main radio, and the main radio may convey an indication of one or more of the transmission patterns to the low power radio. Additionally, or alternatively, the NE may transmit the transmission patterns to a low power processor of a low power wireless device in control signaling (e.g., prior to transmission of the synchronization signals). In yet other examples, the transmission patterns may be otherwise preconfigured or defined at a low power wireless device. The signaling including the low power synchronization signal may include a portion of a cell ID for a serving cell. The low power wireless device may receive additional signaling indicating a remaining portion of the cell ID for the serving cell. For example, a NE may transmit the remaining portion of the cell ID in broadcast signaling, a WUS, a LP-SSS, or in any other type of signaling. The low power wireless device may utilize the synchronization signal and / or the cell ID to establish and maintain a wireless connection with the serving cell.

[0026] Aspects of the present disclosure are described in the context of a wireless communications system.

[0027] Figure 1 illustrates an example of a wireless communications system 100 in accordance with aspects of the present disclosure. The wireless communications system 100 may include one or more NE 102, one or more UE 104, and a core network (CN) 106. The wireless communicationssystem 100 may support various radio access technologies. In some implementations, the wireless communications system 100 may be a 4G network, such as an LTE network or an LTE- Advanced (LTE-A) network. In some other implementations, the wireless communications system 100 may be a new radio (NR) network, such as a 5G network, a 5G-Advanced (5G-A) network, or a 5G ultrawideband (5G-UWB) network. In other implementations, the wireless communications system 100 may be a combination of a 4G network and a 5G network, or other suitable radio access technology including Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20. The wireless communications system 100 may support radio access technologies beyond 5G, for example, 6G. Additionally, the wireless communications system 100 may support technologies, such as time division multiple access (TDMA), frequency division multiple access (FDMA), or code division multiple access (CDMA), etc.

[0028] The one or more NE 102 may be dispersed throughout a geographic region to form the wireless communications system 100. One or more of the NE 102 described herein may be or include or may be referred to as a network node, a base station, a network element, a network function, a network entity, a radio access network (RAN), a NodeB, an eNodeB (eNB), a nextgeneration NodeB (gNB), or other suitable terminology. An NE 102 and a UE 104 may communicate via a communication link, which may be a wireless or wired connection. For example, an NE 102 and a UE 104 may perform wireless communication (e.g., receive signaling, transmit signaling) over a Uu interface.

[0029] An NE 102 may provide a geographic coverage area for which the NE 102 may support services for one or more UEs 104 within the geographic coverage area. For example, an NE 102 and a UE 104 may support wireless communication of signals related to services (e.g., voice, video, packet data, messaging, broadcast, etc.) according to one or multiple radio access technologies. In some implementations, an NE 102 may be moveable, for example, a satellite associated with a non-terrestrial network (NTN). In some implementations, different geographic coverage areas associated with the same or different radio access technologies may overlap, but the different geographic coverage areas may be associated with different NE 102.

[0030] The one or more UEs 104 may be dispersed throughout a geographic region of the wireless communications system 100. A UE 104 may include or may be referred to as a remote unit, a mobile device, a wireless device, a remote device, a subscriber device, a transmitter device, areceiver device, or some other suitable terminology. In some implementations, the UE 104 may be referred to as a unit, a station, a terminal, or a client, among other examples. Additionally, or alternatively, the UE 104 may be referred to as an loT device, an Internet-of-Every thing (loE) device, or machine-type communication (MTC) device, among other examples.

[0031] A UE 104 may be able to support wireless communication directly with other UEs 104 over a communication link. For example, a UE 104 may support wireless communication directly with another UE 104 over a device-to-device (D2D) communication link. In some implementations, such as vehicle-to-vehicle (V2V) deployments, vehicle-to-everything (V2X) deployments, or cellular-V2X deployments, the communication link may be referred to as a sidelink. For example, a UE 104 may support wireless communication directly with another UE 104 over a PC5 interface.

[0032] An NE 102 may support communications with the CN 106, or with another NE 102, or both. For example, an NE 102 may interface with other NE 102 or the CN 106 through one or more backhaul links (e.g., SI, N2, N6, or another network interface). In some implementations, the NE 102 may communicate with each other directly. In some other implementations, the NE 102 may communicate with each other indirectly (e.g., via the CN 106). In some implementations, one or more NE 102 may include subcomponents, such as an access network entity, which may be an example of an access node controller (ANC). An ANC may communicate with the one or more UEs 104 through one or more other access network transmission entities, which may be referred to as a radio heads, smart radio heads, or transmission-reception points (TRPs).

[0033] The CN 106 may support user authentication, access authorization, tracking, connectivity, and other access, routing, or mobility functions. The CN 106 may be an evolved packet core (EPC), or a 5G core (5GC), which may include a control plane entity that manages access and mobility (e.g., a mobility management entity (MME), an access and mobility management functions (AMF)) and a user plane entity that routes packets or interconnects to external networks (e.g., a serving gateway (S-GW), a packet data network (PDN) gateway (P-GW), or a user plane function (UPF)). In some implementations, the control plane entity may manage non-access stratum (NAS) functions, such as mobility, authentication, and bearer management (e.g., data bearers, signal bearers, etc.) for the one or more UEs 104 served by the one or more NE 102 associated with the CN 106.

[0034] The CN 106 may communicate with a packet data network over one or more backhaul links (e.g., via an SI, N2, N6, or another network interface). The packet data network may include an application server. In some implementations, one or more UEs 104 may communicate with the application server. A UE 104 may establish a session (e.g., a protocol data unit (PDU) session, or the like) with the CN 106 via an NE 102. The CN 106 may route traffic (e.g., control information, data, and the like) between the UE 104 and the application server using the established session (e.g., the established PDU session). The PDU session may be an example of a logical connection between the UE 104 and the CN 106 (e.g., one or more network functions of the CN 106).

[0035] In the wireless communications system 100, the NEs 102 and the UEs 104 may use resources of the wireless communications system 100 (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers)) to perform various operations (e.g., wireless communications). In some implementations, the NEs 102 and the UEs 104 may support different resource structures. For example, the NEs 102 and the UEs 104 may support different frame structures. In some implementations, such as in 4G, the NEs 102 and the UEs 104 may support a single frame structure. In some other implementations, such as in 5G and among other suitable radio access technologies, the NEs 102 and the UEs 104 may support various frame structures (i.e., multiple frame structures). The NEs 102 and the UEs 104 may support various frame structures based on one or more numerologies.

[0036] One or more numerologies may be supported in the wireless communications system 100, and a numerology may include a SCS and a cyclic prefix. A first numerology (e.g., / r=0) may be associated with a first SCS (e.g., 15 kHz) and a normal cyclic prefix. In some implementations, the first numerology (e.g., / r=0) associated with the first SCS (e.g., 15 kHz) may utilize one slot per subframe. A second numerology (e.g., / r=l) may be associated with a second SCS (e.g., 30 kHz) and a normal cyclic prefix. A third numerology (e.g., / r=2) may be associated with a third SCS (e.g., 60 kHz) and a normal cyclic prefix or an extended cyclic prefix. A fourth numerology (e.g., / r=3) may be associated with a fourth SCS (e.g., 120 kHz) and a normal cyclic prefix. A fifth numerology (e.g., / r=4) may be associated with a fifth SCS (e.g., 240 kHz) and a normal cyclic prefix.

[0037] A time interval of a resource (e.g., a communication resource) may be organized according to frames (also referred to as radio frames). Each frame may have a duration, forexample, a 10 millisecond (ms) duration. In some implementations, each frame may include multiple subframes. For example, each frame may include 10 subframes, and each subframe may have a duration, for example, a 1 ms duration. In some implementations, each frame may have the same duration. In some implementations, each subframe of a frame may have the same duration.

[0038] Additionally, or alternatively, a time interval of a resource (e.g., a communication resource) may be organized according to slots. For example, a subframe may include a number (e.g., quantity) of slots. The number of slots in each subframe may also depend on the one or more numerologies supported in the wireless communications system 100. For instance, the first, second, third, fourth, and fifth numerologies (i.e., / r=0, jU=l , / r=2, / r=3, / r=4) associated with respective SCSs of 15 kHz, 30 kHz, 60 kHz, 120 kHz, and 240 kHz may utilize a single slot per subframe, two slots per subframe, four slots per subframe, eight slots per subframe, and 16 slots per subframe, respectively. Each slot may include a number (e.g., quantity) of symbols (e.g., orthogonal frequency division multiplexed (OFDM) symbols). In some implementations, the number (e.g., quantity) of slots for a subframe may depend on a numerology. For a normal cyclic prefix, a slot may include 14 symbols. For an extended cyclic prefix (e.g., applicable for 60 kHz SCS), a slot may include 12 symbols. The relationship between the number of symbols per slot, the number of slots per subframe, and the number of slots per frame for a normal cyclic prefix and an extended cyclic prefix may depend on a numerology. It should be understood that reference to a first numerology (e.g., / r=0) associated with a first SCS (e.g., 15 kHz) may be used interchangeably between subframes and slots.

[0039] In the wireless communications system 100, an electromagnetic (EM) spectrum may be split, based on frequency or wavelength, into various classes, frequency bands, frequency channels, etc. By way of example, the wireless communications system 100 may support one or multiple operating frequency bands, such as frequency range designations FR1 (410 MHz - 7.125 GHz), FR2 (24.25 GHz - 52.6 GHz), FR3 (7.125 GHz - 24.25 GHz), FR4 (52.6 GHz - 114.25 GHz), FR4a or FR4-1 (52.6 GHz - 71 GHz), and FR5 (114.25 GHz - 300 GHz). In some implementations, the NEs 102 and the UEs 104 may perform wireless communications over one or more of the operating frequency bands. In some implementations, FR1 may be used by the NEs 102 and the UEs 104, among other equipment or devices for cellular communications traffic (e.g.,control information, data). In some implementations, FR2 may be used by the NEs 102 and the UEs 104, among other equipment or devices for short-range, high data rate capabilities.

[0040] FR1 may be associated with one or multiple numerologies (e.g., at least three numerologies). For example, FR1 may be associated with a first numerology (e.g., / r=0), which includes 15 kHz SCS; a second numerology (e.g., / r=l), which includes 30 kHz SCS; and a third numerology (e.g., / r=2), which includes 60 kHz SCS. FR2 may be associated with one or multiple numerologies (e.g., at least 2 numerologies). For example, FR2 may be associated with a third numerology (e.g., / r=2), which includes 60 kHz SCS; and a fourth numerology (e.g., / r=3), which includes 120 kHz SCS.

[0041] In some cases, a cell may refer to a radio access node in communication with a base station or including a base station. A cell may have a coverage area, which is a geographic area in which the cell may provide wireless connectivity to devices within. Different cells may operate on defined frequencies or frequency bands, referred to as subcarriers. In some examples, a UE 104 may establish a wireless connection with a cell, and subsequently that cell may be referred to as a serving cell of the UE 104.

[0042] In some examples, a wireless device (e.g., a low power wireless device and / or a UE 104) and a NE 102 may exchange synchronization signals to establish and / or maintain a wireless connection. For example, a NE 102 may transmit a PSS to the UE 104 to facilitate initial cell search and identification by the UE 104. The PSS may include a cell ID, time and frequency information to assist the UE 104 in cell search procedures and to synchronize with the NE 102 for communications, cell group information, among other parameters. The NE 102 may also transmit one or more SSSs to the UE 104. An SSS may include additional information to further refine cell identification, including, but not limited to, information indicating a physical cell identity group (PCIG) of a serving cell and frequency domain information. In some other examples, the synchronization signal may include an on-demand synchronization signal and / or a periodic synchronization signal. The NE 102 may transmit an on-demand synchronization signal after receiving a request for a synchronization signal from a wireless device. The NE 102 may transmit a periodic synchronization signal according to a defined periodicity. The on-demand synchronization signal and / or the periodic synchronization signal may include similar information as the PSS and / or the SSS.

[0043] In some examples, the wireless communications system 100 may include one or more low power wireless devices. A low power wireless device may be a wireless device with reduced processing, power, and / or memory capabilities compared to other wireless devices. For example, a low power wireless device may be designed to operate with relatively low power consumption, with reduced transmission and / or reception capabilities (due to reduced transmit power, energy efficient radio transceivers, low power processors, etc.), or both. The low power device may perform energy harvesting techniques to collect and store energy from a received signal to supplement battery power, may utilize sleep modes for different components (transmitter, receiver, processing components etc.) of the wireless device, or the like. Examples of low power wireless devices include, but are not limited to, power sensitive and / or small form factor devices, such as industrial sensors, controllers, wearable device extended reality (XR) devices (e.g., smart glasses), and mobile devices.

[0044] The loT devices may include ambient loT devices. There may be multiple different types of ambient loT devices. A first type of ambient loT device, referred to as a passive loT device, may have no energy storage and no independent signal generation, thus may utilize backscattering transmission techniques to communicate signaling. A second type of ambient loT device, referred to as a semi-passive loT device, may have energy storage, but may not perform independent signal generation. Semi-passive loT devices may utilize backscattering transmission techniques and may utilize stored energy to amplify the reflected (e.g., backscattered) signals. A third type of ambient loT device, referred to as an active loT device, may have energy storage and independent signal generation. For example, an active loT device may include active radio frequency components (e.g., radio, receiver, transmitter, transceiver) for transmitting and / or receiving signals.

[0045] In some examples, the low power wireless device may be an example of a UE 104 with multiple radios, including a main radio and a low power radio, which is described in further detail with respect to Figure 2. In some examples, a low power wireless device may be unable to monitor for, receive, and / or decode a synchronization signal transmission from a NE 102. For example, the low power wireless device may have a reduced receiver range, may be unable to process a synchronization signal due to reduced processing capabilities, may have a reduced power budget for active monitoring for transmissions, among other factors. A low power wireless device failing toreceive a synchronization signal may result in inefficient communications due to increased signaling related to cell search and selection failures, network entry and handover failure, reduced network efficiency, connection instability, and the like. Further, a low power wireless device failing to receive the synchronization signal may result in increased power consumption at the low power wireless device due to the wireless device continuously attempting to perform synchronization with the network without success.

[0046] In some examples, a low power wireless device may receive signaling including a low power synchronization signal that is sent using a transmission pattern from a set of defined transmission patterns. The synchronization signal is low power in that the signal is modulated according to an index modulation scheme, in which indices of elements of a transmission (e.g., subcarriers, antennas, or time slots) convey information in addition to the information indicated by other modulation parameters (e.g., amplitude or phase). In some examples, a NE 102, such as a base station, may configure the set of defined transmission patterns at the low power wireless device. For example, if the low power wireless device is a UE 104 with a main radio and a low power radio, the NE 102 may transmit an indication of the transmission patterns to the main radio, and the main radio may convey an indication of one or more of the transmission patterns to the low power radio. Additionally, or alternatively, the NE 102 may transmit the transmission patterns to a low power processor of a low power wireless device in control signaling (e.g., prior to transmission of the synchronization signals). In yet other examples, the transmission patterns may be otherwise preconfigured or defined at a low power wireless device. The signaling including the low power synchronization signal may include a portion of a cell ID for a serving cell. The low power wireless device may receive additional signaling indicating a remaining portion of the cell ID for the serving cell. For example, a NE 102 may transmit the remaining portion of the cell ID in broadcast signaling, a WUS, a LP-SSS, or in any other type of signaling. The low power wireless device may utilize the synchronization signal and / or the cell ID to establish and maintain a wireless connection with the serving cell.

[0047] Figure 2 illustrates an example of a wireless communications system 200, in accordance with aspects of the present disclosure. In some examples, the wireless communications system 200 implements aspects of the wireless communications system 100. For example, the wireless communications system 200 includes a NE 102 and a UE 104, which may be examples of a NE 102and a UE 104 as described with reference to Figure 1. The NE 102 may be an example of a base station and / or a serving cell. The NE 102 may transmit signaling to one or more radios of the UE 104 via a downlink wireless communications links 202. For example, the NE 102 may transmit data, control signaling, or both to the UE 104 via the downlink wireless communications links 202. Although the downlink wireless communications links 202 are illustrated as separate wireless communications links, the NE 102 may establish a single downlink wireless communications link 202 with the UE 104.

[0048] In some cases, a UE 104 may include multiple radio components for transmitting and receiving signaling from a network device, such as the NE 102. For example, the UE 104 may include a main radio 204 and a low power radio 206. The main radio 204 may additionally, or alternatively, be referred to as or may implement a main receiver. Similarly, the low power radio 206 may additionally, or alternatively, be referred to as or may implement a low power receiver and / or a low power wake-up radio (LP-WUR). The main radio 204 may monitor for and receive NR signaling, which may utilize higher power relative to signaling sent to the low power radio 206. For example, the low power radio 206 may receive a low power WUS (LP-WUS) and may subsequently wake-up the main radio 204 (e.g., by triggering or otherwise initiating an active mode at the low power radio 206). The low power radio 206 may operate with reduced power consumption and / or reduced processing relative to the main radio 204. Thus, the low power radio 206 monitoring for a WUS may utilize relatively less power resources and / or processing resource relative to a main radio 204 monitoring for the WUS, providing for reduced power consumption at the UE 104. A UE 104 may include any numerical quantity of radios (e.g., main radios 204 and low power radios 206).

[0049] In some examples, a low power radio 206 may have a separate baseband (BB) processor, radio frequency (RF) chain 208, and / or antenna 210 than the main radio 204. In some other examples, the low power radio 206 may have a separate BB processor but a shared RF chain 208 and a shared antenna 210 with the main radio 204. In yet other examples, the low power radio 206 may have a shared BB processor, RF chain 208, and antenna 210 with the main radio 204. For dynamic spectrum sharing (DSS), a single low power processor may be connected to the main radio 204 and one or more low power radios 206. A low power radio 206 may correspond to a radio access technology (RAT) or a frequency.

[0050] One or more receiver components of the UE 104 (e.g., a receiver utilized by the main radio 204 and / or the low power radio 206) may have different components and / or functionality. For example, the low power radio 206 may include a heterodyne envelope detector implemented at an intermediate frequency (IF) level. Envelop detection is a demodulation process that extracts a shape that represents the varying amplitude of a modulated signal over time. A heterodyne envelope detector combines an incoming modulated signal with a local oscillator signal to obtain an IF. The IF represents a difference of the frequency of the modulated signal and the frequency of the local oscillator signal. The envelope detector extracts the envelope of the IF signal. In some other examples, the low power radio 206 may include a homodyne, or zero IF, envelop detector at the BB processor. In yet other examples, the low power radio 206 may include an OFDM-based sequence or signal with time domain and / or frequency domain correlation.

[0051] In some examples, the NE 102 may select a waveform to utilize for generating the transmissions to the low power radio 206. For example, the NE 102 may select a waveform that provides for a flat spectrum in the frequency domain, resulting in robustness against frequency selective fading compared to concentrated energy transmissions in the frequency domain. To achieve a flat spectrum transmission, the NE 102 may select an amplitude-shift keying (ASK) modulation scheme, such as an OOK modulation scheme, or sequence. An ASK modulation scheme is a modulation scheme where a transmitting device (e.g., the NE 102) varies an amplitude of a signal between different levels to represent digital data. Different modulation schemes may include different numerical quantities of levels. For example, if there are two levels, then the data may be transmitted as binary values (e.g., “0” for a first amplitude level or “1” for a second amplitude level). For example, OOK-4 may refer to an OOK modulation scheme with four levels. An OOK-4 modulation scheme with a sequence (e.g., Zadoff-Chu, M-sequence, or quadrature amplitude modulation (QAM) sequence) applied before a Discrete Fourier Transform (DFT) and / or least square (ES) with variation in phase may achieve a flatter spectrum. In some examples, the UE 104 knowing a sequence the NE 102 used to generate a signal (e.g., a EP-WUS) may improve performance for a receiver of the UE 104.

[0052] In some examples, a receiver may implement in-phase and quadrature (I / Q) branches to represent and demodulate a signal. For example, a receiver may separate a received signal into separate in-phase and quadrature components to represent the modulation of a signal. Knowledge ofone or more sequences used in LP-WUS waveform generation may improve performance for at least a receiver with I / Q branches. In some examples, the NE 102 may select a waveform with a harmonized design that accommodates different waveforms (e.g., OOK with one level (OOK-1), OOK-4, and an OFDM waveform). For example, the waveform may include OFDM sequences overlaid with OOK symbols. According to the harmonized waveform implementation, the OOK signal may include a sequence or randomly modulated symbols (e.g., for quadrature PSK (QPSK)) transmitted within an ON-duration of the OOK transmission to produce a flattened spectrum to improve against frequency selective fading. The sequence may be a Zadoff-Chu sequence, an M- sequence, a gold sequence, and / or a Golay sequence. In some cases, in the off duration of OOK transmission, no signal transmission occurs.

[0053] In some examples, the NE 102 and the UE 104 may exchange control signaling to establish and maintain a wireless connection. For example, the NE 102 and / or the UE 104 may transmit and / or receive one or more reference signals, including, but not limited to, a synchronization signal block (e.g., a PSS, SSS, physical broadcast channel (PBCH), demodulation reference signal (DMRS)), a LP-WUS waveform sequence, or a low power synchronization signal 212 (e.g., LP-PSS, LP-SSS, on-demand low power synchronization signal 212 or periodic low power synchronization signal 212). The NE 102 and / or the UE 104 may perform one or more measurements on the reference signals to evaluate signal metrics, including signal quality, signal power, and / or detection rate of a reference signal. Example measurements include, but are not limited to, a low power receive signal strength indicator (LP-RSSI) or energy detection including a linear average of total received power over a RSSI resource, low power reference signal receive power (LP-RSRP) including a linear average of received power of resource of reference signals or signal parts, a low power reference signal receive quality (LP-RSRQ) (e.g., [N x] LP-RSRP / LP- RSSI, where N is the factor of resource size difference for evaluation LP-RSRP and LP-RSSI).

[0054] In some examples, a UE 104 may utilize a physical cell ID (PCI), or other cell ID, to identify a serving cell they are connected to. The UE 104 may obtain the PCI by decoding a PSS and SSS. In some cases, the NE 102 may transmit the PSS in a defined numerical quantity of bits and according to a periodicity (e.g., as a 15-bit signal every 1 millisecond (ms)). Similarly, the NE 102 may transmit the SSS in a defined numerical quantity of bits and according to a periodicity (e.g., a 10-bit signal that is transmitted every 10 ms). The UE 104 may calculate the PCI bymultiplying the SSS by a factor, x (e.g., 3), and adding the PSS. In some examples, the PCI for NR is a bit value (e.g., a 24 bit value ranging from 0 to 1007). For example, the PSS may have 3 values (e.g., 0, 1, and 2), and the NE 102 may generate the PSS using a sequence (e.g., m-sequence). The SSS may have 336 values (e.g., values 0 to 335), and the NE 102 may generate the SSS using a product of 2 m-sequences. In some examples, the NE 102 may transmit a PSS and one or more SSSs. A UE 104 may calculate a PCI of a cell using Equation 1:E {0,1,2} for a PSS having 3 values and an SSS having 336 values. Using the above values as an example, the PCI values may vary from 0 to 1007 (e.g., 1008 unique PCIs).

[0055] In some cases, a low power radio 206 may be unable to monitor for, receive, and / or decode a synchronization signal transmission from the NE 102. For example, the low power radio 206 may have a reduced receiver range, may be unable to process a synchronization signal due to reduced processing capabilities, may have a reduced power budget for active monitoring for transmissions, among other factors. A low power radio 206 failing to receive a synchronization signal may result in inefficient communications due to increased signaling related to cell search and selection failures, network entry and handover failure, reduced network efficiency, connection instability, and the like. Further, a low power radio 206 failing to receive the synchronization signal may result in increased power consumption at the UE 104 due to the UE 104 continuously attempting to perform synchronization with the network without success.

[0056] For a low power radio 206 that cannot receive a synchronization signal, the NE 102 may transmit a periodic low power synchronization signal 212 for radio resource management (RRM) measurements, at least course time synchronization of the low power radio 206, and / or at least course frequency synchronization of the low power radio 206. The signaling overhead of the periodic low power synchronization signal 212 depends on the periodicity of the low power synchronization signal 212, system bandwidth, a numerical quantity of beams, and / or resources to fulfill the target functionality, among other factors. The NE 102 transmitting a periodic low power synchronization signal 212 for course synchronization may reduce signaling overhead of signaling preceding a LP-WUS. A low power synchronization signal 212 may have a common design amongUE groups (e.g., may be cell specific) to further reduce system overhead. For fine time and frequency synchronization, a signal (e.g., a preamble) preceding or part of a LP-WUS may be used.

[0057] In some examples, the network (e.g., the NE 102) may configure a set of transmission patterns to use for transmitting a low power synchronization signal 212. That is, the transmission patterns may be preconfigured, or otherwise defined, at the UE 104. For example, the NE 102 may send a transmission pattern indication 214 to the UE 104 (e.g., to a main radio 204 and / or to the low power radio 206). In some cases, the transmission pattern indication 214 may include an indication of the set of the transmission patterns and may be sent prior to exchanging synchronization signals using the transmission pattern. In some other cases, the transmission patterns may be otherwise defined at the main radio 204 and / or the low power radio 206 prior to exchanging synchronization signals. In some examples, the transmission pattern indication 214 may additionally, or alternatively, include an indication of a transmission pattern of the set of transmission patterns the NE 102 plans to use to transmit a low power synchronization signal 212.

[0058] Example transmission patterns include, but are not limited to, binary transmission patterns (e.g., including “1” and “0”). In some examples, a transmission pattern includes alternating “1” and “0” (e.g., 101010...), where each symbol “1” or “0” is modulated using an OOK modulation scheme. In some other examples, a transmission pattern includes a group of multiple “Is” followed by a single “0,” such as “110110110...,” where each symbol is modulated using an OOK modulation scheme. In yet other examples, a transmission pattern includes all “Is” using an OOK modulation scheme. In some examples, the set of transmission patterns may be defined for a low power synchronization signal 212 modulated using the OOK modulation scheme. The NE 102 utilizing an OOK modulation scheme advantageously features stability in power measurement and therefore the automatic gain control (AGC) may settle quickly at a low power radio 206. Utilizing an OOK modulation scheme may also accelerate synchronization by measuring power within OOK chips. Although an OOK modulation scheme is described, the transmission pattern may be modulated using any type of index modulation scheme (e.g., FSK, PSK, or MSK). In the OOK modulation scheme, the amplitude of the signal may be varied to differentiate between “Is” and “0s.” In the FSK modulation scheme, a frequency shifts produces “Is” and “0s.” In the PSK modulation scheme, a phase shift produces “Is” and “0s.” The MSK modulation scheme is a formof a continuous-phase FSK modulation scheme. To further improve reliability, the NE 102 may apply Manchester coding or miller coding to the modulated signal.

[0059] The NE 102 may select a transmission pattern to use for the transmission of one or more low power synchronization signals 212 (e.g., a LP-PSS, a LP-SSS, an on-demand low power synchronization signal, a periodic low power synchronization signal, or the like). The transmission may include multiple OOK bits and a location of the low power synchronization signal 212 within a subframe. The NE 102 may generate and transmit the low power synchronization signal 212 to a low power radio 206 of the UE 104. Additionally, or alternatively, the NE 102 may generate and transmit the low power synchronization signal 212 to a low power processor of a low power wireless device, which is described in further detail with respect to Figure 3. The NE 102 may generate the low power synchronization signal 212 using the selected transmission pattern by modulating the low power synchronization signal 212 using the transmission pattern and an index modulation scheme.

[0060] If the low power radio 206 is capable of envelop detection, then the low power radio 206 may decode the low power synchronization signal 212 using the OOK symbols. If the low power radio 206 is capable of decoding sequences, then the low power radio 206 may decode the sequence within the low power synchronization signal 212. In some examples, the low power radio 206 may blindly detect the transmission pattern of the low power synchronization signal 212 from a set of preconfigured or otherwise defined transmission patterns (e.g., radio resource control (RRC) configured transmission patterns). That is, the low power radio 206 may not know what transmission pattern the NE 102 used to transmit the low power synchronization signal 212 prior to receiving the low power synchronization signal 212. The low power radio 206 may compare the transmission pattern of the received low power synchronization signal 212 to the set of preconfigured transmission patterns to identify which transmission pattern the NE 102 used to transmit the low power synchronization signal 212. In some examples, the low power radio 206 may blindly detect the transmission pattern to detect the low power synchronization signal 212 (e.g., a LP-PSS). In some cases, the low power radio 206 may determine the portion of the cell ID included in the low power synchronization signal 212 after detecting the low power synchronization signal 212 (e.g., a LP-PSS). The NE 102 may transmit a remaining portion of the cell ID as payloadmodulated using a same index modulation scheme (e.g., an OOK modulation scheme), such as using a LP-SSS or as part of a broadcast signal or WUS.

[0061] In some cases, the main radio 204 may provide an indication of the transmission pattern to the low power radio 206 to reduce time and processing resource utilized by the low power radio 206 to blind decode the low power synchronization signal 212. For example, the transmission pattern may be derived from the main radio 204 cell ID and provided to the low power radio 206. Additionally, or alternatively, the NE 102 may explicitly indicate the transmission pattern to the main radio 204 (e.g., in system information broadcast signaling), and the main radio 204 may indicate the transmission pattern to the low power radio 206. In some examples, the NE 102 may include a mapping between an NR SSB and / or PSS sequence and a low power synchronization signal 212 transmission pattern in the transmission pattern indication 214 to the main radio 204. The main radio 204 may use the association to detect the pattern of the low power synchronization signal 212 transmitted by the NE 102. In some examples, the NE 102 may explicitly indicate the mapping to the main radio 204 (e.g., via the transmission pattern indication 214). In some other examples, the mapping may be preconfigured or otherwise defined, and the main radio 204 may implicitly determine the association.

[0062] In some examples, a low power synchronization signal 212 (e.g., a LP-PSS, on-demand low power synchronization signal 212, or periodic low power synchronization signal 212) may include a portion of a cell ID for a serving cell transmitting the low power synchronization signal 212. The NE 102 (e.g., the serving cell) may transmit a remaining portion of the cell ID as a pay load either in a LP-SSS, a LP-WUS payload, or any other low power broadcast signaling. In some examples, the low power broadcast signaling may include information related to the cell bearing, frame numbering, TDD uplink or downlink configuration bits, among other information. If the remaining portion of the cell ID is included in a LP-SSS, the NE 102 may transmit the LP-SSS as an index modulated payload. In some cases, the LP-SSS may include Iog2( / V / £>(1)) bits, where if / V / £>(1) 6 {0, 1, ... , 335} the LP-SSS includes 9 bits. The UE 104 may utilize the cell ID to establish a wireless connection with the NE 102. For example, the UE 104 may enter the coverage area of a serving cell (e.g., the NE 102 or in communication with the NE 102), and may perform a synchronization procedure including cell search, exchanging of synchronization signals, and cell selection and handover utilizing the cell ID to identify a new serving cell. Once the UE 104 and theNE 102 have established a wireless connection, the UE 104 and the NE 102 may exchange data transmissions, including a preamble and a payload, which is described in further detail with respect to Figure 4.

[0063] In some examples, a UE 104 may be unable to identify a start or an end of a transmission (e.g., a data transmission and / or transmission of the low power synchronization signal 212). For example, the low power radio 206 may wake-up and begin monitoring during the middle of a data transmission or low power synchronization signal 212 transmission. Thus, the UE 104 may be unable to identify whether the transmission is a data transmission or a low power synchronization signal 212. To prevent increased signaling overhead due to incorrectly decoding a low power synchronization signal 212 as a data transmission or a data transmission as a low power synchronization signal 212, the NE 102 may include one or more known bits into the transmission. The known bits may be referred to as a synchronization word (e.g., sync word). The synchronization word may be preconfigured or otherwise defined, such as included in control signaling from a NE 102. The use and implementation of the synchronization word is further described with respect to Figures 4 through 7.

[0064] In some examples, the symbols in the low power synchronization signal 212 and / or in a data transmission from the NE 102 may include a sequence, such as a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence transmitted within the on-duration of the symbols. If the UE 104 is capable of performing correlation, then the UE 104 may correlate the received sequence with a predefined sequence to perform peak detection and thus performing low power synchronization signal 212 and / or preamble detection. The sequence may be predefined for the low power synchronization signal 212 and may have orthogonal cyclic shifts from the base sequence for different cell IDs (e.g., or a cell ID may have different orthogonal base sequence). The sequence of the preamble may be scrambled with the cell ID to reduce inter-cell interference. In some examples, the NE 102 may assemble a payload with a numerical quantity of bits (e.g., X bits) into a frame structure including a preamble, one or more synchronization words, a payload, and cyclic redundance check (CRC) bits. The UE 104 may receive a preamble at the beginning of the frame, and a receiver of the UE 104 may determine the preamble by correlating the preamble with the known sequence to determine a start of the frame. The UE 104 receives the synchronization word at the beginning and / or end of the preamble or along with the preamble sequence, where thebeginning and / or at the end of the preamble may have a sequence to identify the synchronization word. After receiving and / or detecting the synchronization word, the UE 104 may demodulate the payload of the data transmission.

[0065] Figure 3 illustrates an example of a wireless communications system 300, in accordance with aspects of the present disclosure. In some examples, the wireless communications system 300 implements aspects of the wireless communications system 100 and the wireless communications system 200. For example, the wireless communications system 300 includes a NE 102, which may be an example of a NE 102 as described with reference to Figure 1. The NE 102 may be an example of a base station and / or a serving cell. The NE 102 may transmit signaling to a low power processor 302 of a low power wireless device via a downlink wireless communications link 304. For example, the NE 102 may transmit data, control signaling, or both to the low power processor 302 via the downlink wireless communications link 304.

[0066] In some examples, the low power processor 302 may include or implement architecture or receiver type of a low power radio (e.g., the low power radio 206) as described with reference to Figure 2. The low power processor 302 may be related to a standalone transmission and / or reception loT device and / or an auxiliary chip to wake-up a main processor of a wireless device, among other implementations.

[0067] In some cases, the NE 102 and the low power processor 302 may exchange control signaling to establish and maintain a wireless connection, as described with reference to Figure 2. For example, the NE 102 and / or the low power processor 302 may transmit and / or receive one or more reference signals, including, but not limited to, a synchronization signal block, a LP-WUS waveform sequence, or a low power synchronization signal 306 (e.g., LP-PSS, LP-SSS, on-demand low power synchronization signal 306 or periodic low power synchronization signal 306). In some cases, a low power processor 302 may be unable to monitor for, receive, and / or decode a synchronization signal transmission from the NE 102 (e.g., an NR synchronization signal transmission). For example, the low power processor 302 may have a reduced receiver range, may be unable to process a synchronization signal due to reduced processing capabilities, may have a reduced power budget for active monitoring for transmissions, among other factors. A low power processor 302 failing to receive a synchronization signal may result in inefficient communications due to increased signaling related to cell search and selection failures, network entry and handoverfailure, reduced network efficiency, connection instability, and the like. Further, the low power processor 302 failing to receive the synchronization signal may result in increased power consumption at the low power processor 302 due to the low power processor 302 continuously attempting to perform synchronization with the network without success.

[0068] For a low power processor 302 that cannot receive a synchronization signal, the NE 102 may transmit a periodic low power synchronization signal 306, an on-demand low power synchronization signal 306, a LP-PSS, and / or a LP-SSS, as described with reference to Figure 2. In some examples, the network (e.g., the NE 102) may configure a set of transmission patterns to use for transmitting a low power synchronization signal 306. That is, the transmission patterns may be preconfigured, or otherwise defined, at the low power processor 302. For example, the NE 102 may send an indication of the transmission patterns to the low power processor 302 prior to exchanging synchronization signals using the transmission pattern. In some other cases, the transmission patterns may be otherwise defined at the low power processor 302 prior to exchanging synchronization signals.

[0069] The NE 102 may select a transmission pattern to use for the transmission of one or more low power synchronization signals 306 (e.g., a LP-PSS, a LP-SSS, an on-demand low power synchronization signal, a periodic low power synchronization signal, or the like). The NE 102 may generate and transmit the low power synchronization signal 306 to a low power processor 302. The NE 102 may generate the low power synchronization signal 306 using the selected transmission pattern by modulating the low power synchronization signal 306 using the transmission pattern and an index modulation scheme.

[0070] In some examples, at 308, the low power processor 302 may blindly detect the transmission pattern of the low power synchronization signal 306 from a set of preconfigured or otherwise defined transmission patterns. That is, the low power processor 302 may not know what transmission pattern the NE 102 used to transmit the low power synchronization signal 306 prior to receiving the low power synchronization signal 306. The low power processor 302 may compare the transmission pattern of the received low power synchronization signal 306 to the set of preconfigured transmission patterns to identify which transmission pattern the NE 102 used to transmit the low power synchronization signal 306. In some examples, the low power processor 302 may blindly detect the transmission pattern to detect the low power synchronization signal 306 (e.g.,a LP-PSS). In some examples, the low power processor 302 may determine the portion of the cell ID included in the low power synchronization signal 306 after detecting the low power synchronization signal 306 (e.g., a LP-PSS). The NE 102 may transmit a remaining portion of the cell ID as payload modulated using a same index modulation scheme (e.g., an OOK modulation scheme), such as using a LP-SSS or as part of a broadcast signal or WUS.

[0071] In some cases, the NE 102 may provide an indication of the transmission pattern to the low power processor 302 to reduce time and processing resource utilized by the low power processor 302 to blind decode the low power synchronization signal 306. For example, the NE 102 may explicitly indicate the transmission pattern to the low power processor 302 (e.g., in system information broadcast signaling). In some examples, the NE 102 may include a mapping between an NR SSB and / or PSS sequence and a low power synchronization signal 306 to the low power processor 302. The low power processor 302 may use the association to detect the pattern of the low power synchronization signal 306 transmitted by the NE 102. In some examples, the NE 102 may explicitly indicate the mapping to the low power processor 302. In some other examples, the mapping may be preconfigured or otherwise defined, and the low power processor 302 may implicitly determine the association.

[0072] In some examples, a low power synchronization signal 306 (e.g., a LP-PSS, on-demand low power synchronization signal 212, or periodic low power synchronization signal 212) may include a portion of a cell ID for a serving cell transmitting the low power synchronization signal 306. The NE 102 (e.g., the serving cell) may transmit a remaining portion of the cell ID in a cell ID indication 310. For example, the NE 102 may include the cell ID indication 310 as a payload either in a LP-SSS, a LP-WUS payload, or any other low power broadcast signaling. In some examples, the low power broadcast signaling may include information related to the cell bearing, frame numbering, TDD uplink or downlink configuration bits, among other information. If the remaining portion of the cell ID is included in a LP-SSS, the NE 102 may transmit the LP-SSS as an index modulated payload. The low power processor 302 may utilize the cell ID to establish a wireless connection with the NE 102. For example, the low power processor 302 may enter the coverage area of a serving cell (e.g., the NE 102 or in communication with the NE 102), and may perform a synchronization procedure including cell search, exchanging of synchronization signals, and cell selection and handover utilizing the cell ID to identify a new serving cell. Once the low powerprocessor 302 and the NE 102 have established a wireless connection, the low power processor 302 and the NE 102 may exchange data transmissions, including a preamble and a payload, which is described in further detail with respect to Figure 4.

[0073] In some examples, a low power processor 302 may be unable to identify a start or an end of a transmission (e.g., a data transmission and / or transmission of the low power synchronization signal 306). For example, the low power processor 302 may wake-up and begin monitoring during the middle of a data transmission or low power synchronization signal 306 transmission. Thus, the low power processor 302 may be unable to identify whether the transmission is a data transmission or a low power synchronization signal 306. To prevent increased signaling overhead due to incorrectly decoding a low power synchronization signal 306 as a data transmission or a data transmission as a low power synchronization signal 306, the NE 102 may include a synchronization word. The synchronization word may be preconfigured or otherwise defined, such as included in control signaling from a NE 102. The use and implementation of the synchronization word is further described with respect to Figures 4 through 7.

[0074] In some examples, the symbols in the low power synchronization signal 306 and / or in a data transmission from the NE 102 may include a sequence, such as a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence transmitted within the on-duration of the symbols. If the low power processor 302 is capable of performing correlation, then the low power processor 302 may correlate the received sequence with a predefined sequence to perform peak detection and thus performing low power synchronization signal 306 and / or preamble detection. The sequence may be predefined for the low power synchronization signal 306 and may have orthogonal cyclic shifts from the base sequence for different cell IDs (e.g., or a cell ID may have different orthogonal base sequence). The sequence of the preamble may be scrambled with the cell ID to reduce inter-cell interference. In some examples, the NE 102 may assemble a payload with a numerical quantity of bits (e.g., X bits) into a frame structure including a preamble, one or more synchronization words, a payload, and cyclic redundance check (CRC) bits. The low power processor 302 may receive a preamble at the beginning of the frame, and a receiver of the low power processor 302 may determine the preamble by correlating the preamble with the known sequence to determine a start of the frame. The low power processor 302 receives the synchronization word at the beginning and / or end of the preamble or along with the preamblesequence, where the beginning and / or at the end of the preamble may have a sequence to identify the synchronization word. After receiving and / or detecting the synchronization word, the low power processor 302 may demodulate the payload of the data transmission.

[0075] Figure 4 illustrates an example of a transmission diagram 400 in accordance with aspects of the present disclosure. In some examples, the transmission diagram 400 may implement, or be implemented by, aspects of the wireless communications system 100, the wireless communications system 200, and the wireless communications system 300. The example transmission diagram 400 may be implemented by a low power wireless device (e.g., a UE and / or a low power processor) and a NE (e.g., a base station), which may be examples of the corresponding devices as described with reference to Figures 1 through 3. For example, a low power wireless device may receive signaling from a NE including a data transmission with a transmission scheme (e.g., a transmission scheme A, transmission scheme B, or transmission scheme C).

[0076] In some examples, a NE and a low power wireless device (e.g., a low power processor 302 and / or a UE 104 with a low power radio 206, as described with reference to Figures 2 and 3) may exchange synchronization signaling to establish a wireless connection, as descried with reference to Figures 2 and 3. Once the NE and the low power wireless device have established a wireless connection, the NE may transmit a data transmission to the low power wireless device. The data transmission may include a preamble 402 and a payload including data 404. The NE may transmit the data transmission according to different transmission schemes, such as a transmission scheme A, a transmission scheme B, or a transmission scheme C. The transmission schemes may include a synchronization word 406, or a sync word, that indicates to the receiving device (e.g., the low power wireless device) the start and / or end of a portion of the data transmission. If the low power wireless device begins monitoring for and receiving the data transmission in the middle of the transmission, the low power wireless device may be unable to determine what portion of the data transmission is being received. Thus, the NE may insert one or more known bits (e.g., the synchronization word 406) into various portions of the data transmission to indicate the start and / or end of transmission of a preamble 402 or data 404.

[0077] In some examples, such as for the transmission scheme A, the NE may insert a synchronization word 406 at the end of the preamble 402. Thus, if the low power wireless device begins monitoring for and receiving the data transmission in the middle of the preamble 402, thenthe low power wireless device may determine that the transmission is the preamble 402 upon receiving the synchronization word 406. If the low power wireless device begins monitoring for and receiving the data transmission in the middle of the data 404, then the low power wireless device may determine that the transmission is the data 404 based on not receiving a synchronization word 406.

[0078] In some other examples, such as for the transmission scheme B, the NE may insert a synchronization word 406 at the beginning of the preamble 402 and at the beginning of the data 404. The NE may utilize the same or different synchronization words 406 at the beginning of the preamble 402 and at the beginning of the data 404. Thus, if the low power wireless device begins monitoring for and receiving the data transmission in the middle of the preamble 402, then the low power wireless device may determine that the transmission is the preamble 402 upon receiving the synchronization word 406 prior to the data 404. If the low power wireless device begins monitoring for and receiving the data transmission in the middle of the data 404, then the low power wireless device may determine that the transmission is the data 404 based on not receiving a synchronization word 406. If the low power wireless device is able to receive the entire data transmission, then the low power device may detect the preamble 402 based on the synchronization word 406 prior to the transmission of the preamble 402.

[0079] In yet other examples, such as for the transmission scheme C, the NE may insert a synchronization word 406 at the beginning of the preamble 402. Thus, if the low power wireless device begins monitoring for and receiving the data transmission prior to transmission of the preamble 402, then the low power wireless device may determine that the transmission includes the preamble 402 upon receiving the synchronization word 406.

[0080] In some examples, the NE may assemble a data transmission including a numerical quantity of bits (e.g., X bits) into a frame structure, the data transmission including a preamble 402, one or more synchronization words 406, a payload including the data 404, and one or more CRC bits. The NE may transmit the data transmission to a low power wireless device. The low power wireless device may receive a known preamble at a beginning of the frame and may determine the preamble by correlating the known preamble with the known binary bit pattern to determine the start of the frame. Additionally, or alternatively, the low power wireless device may receive the synchronization word 406 at the beginning and / or end of the preamble 402. The synchronizationword 406 may be transmitted along with a preamble binary pattern. The beginning and / or the end of the preamble 402 may have a same bit pattern to identify the synchronization word 406. After receiving the synchronization word 406, the low power wireless device may proceed to demodulate the payload.

[0081] In some examples, the value of the synchronization word 406 may be a preconfigured, or otherwise defined, value. For example, the synchronization word 406 may be predefined as OxFF, so that the low power wireless device may ramp up the power for the transmission of a following signal. In some other examples, the sync word may be predefined as OxFO to indicate for the low power device to ramp down the power at the end of a slot. In some cases, the NE may send the synchronization word 406 after the preamble 402, along with the preamble 402, or as part of the preamble 402. The synchronization word 406 may provide byte level synchronization to the received frame structure. For example, the first and / or last few bits of the preamble 402 may include a same repeated bit pattern to identify the start and / or end of preamble (e.g., <1111> sync word <110011001100> preamble <1111> sync word). As the payload may be variable, the synchronization word 406 may be transmitted at the end of the payload to determine the end of the frame. There may be a low power synchronization signal block frame including a synchronization word 406, a LP-PSS, a LP-SSS or / and a broadcast payload, which is then followed by the preamble 402 and the data 404. For a low power wake up radio integrated with a main radio, the synchronization word 406 is placed after the low power synchronization signal for byte synchronization. The synchronization word 406 maybe part of the low power synchronization signal. A predefined pattern may be added to the beginning or end of the synchronization pattern and similarly to the LP-WUS payload to determine the end of the signal.

[0082] Figure 5 illustrates an example of a transmission diagram 500 in accordance with aspects of the present disclosure. In some examples, the transmission diagram 500 may implement, or be implemented by, aspects of the wireless communications system 100, the wireless communications system 200, the wireless communications system 300, and the transmission diagram 400. The example transmission diagram 500 may be implemented by a low power wireless device (e.g., a UE and / or a low power processor) and a NE (e.g., a base station), which may be examples of the corresponding devices as described with reference to Figures 1 through 3. Forexample, a low power wireless device may receive signaling from a NE including a data transmission with a transmission scheme (e.g., a transmission scheme D or transmission scheme E).

[0083] In some examples, a NE and a low power wireless device (e.g., a low power processor 302 and / or a UE 104 with a low power radio 206, as described with reference to Figures 2 and 3) may exchange synchronization signaling to establish a wireless connection, as descried with reference to Figures 2 and 3. For example, the NE may transmit a LP-PSS 502 and / or one or more LP-SSSs 504 to the low power wireless device. The NE may transmit the low power synchronization signals (e.g., the LP-PSS 502 and / or the one or more LP-SSSs 504) according to different transmission schemes, such as a transmission scheme D or a transmission scheme E. The transmission schemes may include a synchronization word 506, or a sync word, that indicates to the receiving device (e.g., the low power wireless device) the start and / or end of a portion of the low power synchronization signal transmission. The synchronization word 506 may be an example of the synchronization word 406 as described with reference to Figure 4. If the low power wireless device begins monitoring for and receiving the low power synchronization signal transmission in the middle of the transmission, the low power wireless device may be unable to determine what portion of the low power synchronization signal transmission is being received. Thus, the NE may insert one or more known bits (e.g., the synchronization word 506) into various portions of the low power synchronization signal transmission to indicate the start and / or end of transmission of the LP- PSS 502 and / or the one or more LP-SSSs 504.

[0084] In some examples, such as for the transmission scheme D, the NE may insert a synchronization word 506 at the beginning of the LP-PSS 502 and the one or more LP-SSSs 504. Thus, if the low power wireless device begins monitoring for and receiving the low power synchronization signal transmission in the middle of the LP-PSS 502, then the low power wireless device may determine that the transmission is the LP-PSS 502 and is followed by the LP-SSS 504 upon receiving the synchronization word 506 at the beginning of the LP-SSS 504. If the low power wireless device begins monitoring for and receiving the data transmission in the middle of the LP- SSS 504, then the low power wireless device may determine that the transmission is the LP-SSS 504 based on not receiving a synchronization word 506 at the end of the transmission. If the low power wireless device is able to receive the entire low power synchronization signal transmission, then the low power device may detect the LP-PSS 502 based on the synchronization word 506 priorto the transmission of the LP-PSS 502. The NE may utilize the same or different synchronization words 506 at the beginning of LP-PSS 502 and at the beginning of the one or more LP-SSSs 504.

[0085] In some other examples, such as for the transmission scheme E, the NE may insert a synchronization word 506 at the end of the LP-PSS 502 and the one or more LP-SSSs 504. Thus, if the low power wireless device begins monitoring for and receiving the low power synchronization signal transmission in the middle of the LP-PSS 502, then the low power wireless device may determine that the transmission is the LP-PSS 502 upon receiving the synchronization word 506 prior to the LP-SSS 504. If the low power wireless device begins monitoring for and receiving the low power synchronization signal transmission in the middle of the LP-SSS 504, then the low power wireless device may determine that the transmission is the LP-SSS 504 based on receiving a synchronization word 506 at the end of the transmission. The NE may utilize the same or different synchronization words 506 at the end of LP-PSS 502 and at the end of the one or more LP-SSSs 504.

[0086] In some examples, the NE may assemble a low power synchronization signal transmission including a numerical quantity of bits (e.g., X bits) into a frame structure, the low power synchronization signal transmission including a LP-PSS 502, one or more synchronization words 506, and one or more LP-SSSs 504. The NE may transmit the low power synchronization signal transmission to a low power wireless device. The low power wireless device may receive the synchronization word 506 at the beginning and / or end of the LP-PSS 502 and / or LP-SSS 504. After receiving the synchronization word 506, the low power wireless device may proceed to demodulate the LP-PSS 502 and / or the LP-SSS 504.

[0087] Figure 6 illustrates an example of a transmission diagram 600 in accordance with aspects of the present disclosure. In some examples, the transmission diagram 600 may implement, or be implemented by, aspects of the wireless communications system 100, the wireless communications system 200, and the wireless communications system 300. The example transmission diagram 600 may be implemented by a low power wireless device (e.g., a UE and / or a low power processor) and a NE (e.g., a base station), which may be examples of the corresponding devices as described with reference to Eigures 1 through 3. Lor example, a low power wireless device may receive signaling from a NE including a data transmission with a transmission scheme (e.g., a transmission scheme E or transmission scheme G).

[0088] In some examples, a NE and a low power wireless device (e.g., a low power processor 302 and / or a UE 104 with a low power radio 206, as described with reference to Figures 2 and 3) may exchange synchronization signaling to establish a wireless connection, as descried with reference to Figures 2 and 3. For example, the NE may transmit a low power synchronization signal 602 to the low power wireless device. The low power synchronization signal 602 may be a periodic or on-demand low power synchronization signal 602 with a predefined bit pattern. The bit pattern may include part of a cell ID for a serving cell that transmitted the low power synchronization signal 602 but may not include a EP-PSS and / or EP-SSS. A NE may begin a transmission of an on- demand low power synchronization signal 602 when an inventory round is triggered by higher layer signaling and may stop transmitting the on-demand low power synchronization signal 602 when the inventory round is finished. In some cases, there is a fixed offset between the low power synchronization signal 602 and a preamble and data block. The transmission occasions of the low power synchronization signal 602 are semi-statically configured.

[0089] The NE may transmit the low power synchronization signals 602 according to different transmission schemes, such as a transmission scheme F or a transmission scheme G. The transmission schemes may include a synchronization word 604, or a sync word, that indicates to the receiving device (e.g., the low power wireless device) the start and / or end of a portion of the low power synchronization signal 602. The synchronization word 604 may be an example of the synchronization word 406 as described with reference to Figure 4. If the low power wireless device begins monitoring for and receiving the low power synchronization signal 602 in the middle of the transmission, the low power wireless device may be unable to determine that a low power synchronization signal 602 is being received. Thus, the NE may insert one or more known bits (e.g., the synchronization word 604) at the beginning and / or end of the low power synchronization signal 602 to indicate the start and / or end of the transmission.

[0090] In some examples, such as for the transmission scheme F, the NE may insert a synchronization word 604 at the end of the low power synchronization signal 602. Thus, if the low power wireless device begins monitoring for and receiving the low power synchronization signal 602 in the middle of the transmission, then the low power wireless device may determine that the transmission is the low power synchronization signal 602 upon receiving the synchronization word 604 at the end of the low power synchronization signal 602. In some other examples, such as for thetransmission scheme G, the NE may insert a synchronization word 604 at the beginning of the low power synchronization signal 602.

[0091] Figure 7 illustrates an example of a transmission diagram 700 in accordance with aspects of the present disclosure. In some examples, the transmission diagram 700 may implement, or be implemented by, aspects of the wireless communications system 100, the wireless communications system 200, and the wireless communications system 300. The example transmission diagram 700 may be implemented by a low power wireless device (e.g., a UE and / or a low power processor) and a NE (e.g., a base station), which may be examples of the corresponding devices as described with reference to Figures 1 through 3. For example, a low power wireless device may receive signaling from a NE including a data transmission with a transmission scheme (e.g., a transmission scheme H, transmission scheme I, transmission scheme J, or transmission scheme K).

[0092] In some examples, a NE and a low power wireless device (e.g., a low power processor 302 and / or a UE 104 with a low power radio 206, as described with reference to Figures 2 and 3) may exchange synchronization signaling to establish a wireless connection, as descried with reference to Figures 2 and 3. For example, the NE may transmit a LP-PSS 702 and / or one or more LP-SSSs 704 to the low power wireless device. The NE may transmit the low power synchronization signals (e.g., the LP-PSS 702 and / or the one or more LP-SSSs 704) according to different transmission schemes, such as a transmission scheme H, a transmission scheme I, a transmission scheme J, or a transmission scheme K. The transmission schemes may include a synchronization word 706, or a sync word, that indicates to the receiving device (e.g., the low power wireless device) the start and / or end of a portion of the low power synchronization signal transmission. The synchronization word 706 may be an example of the synchronization word 406 as described with reference to Figure 4. The transmission schemes may also include a low power broadcast transmission 708, which may include information related to a cell bearing of the serving cell, frame numbering, TDD uplink and / or downlink configuration bits, among other information. Additionally, or alternatively, the transmission schemes may include a preamble 710 and data 712, which may be examples of the preamble 402 and the data 404 as described with reference to Figure 4. If the low power wireless device begins monitoring for and receiving the LP-PSS 702, the LP- SSS 704, the low power broadcast transmission 708, the preamble 710, and / or the data 712 in themiddle of the transmission, the low power wireless device may be unable to determine what portion of the transmission is being received. Thus, the NE may insert one or more known bits (e.g., the synchronization word 706) into various portions of the transmission to indicate the start and / or end of the LP-PSS 702, the LP-SSS 704, the low power broadcast transmission 708, the preamble 710, and / or the data 712.

[0093] In some examples, such as for the transmission scheme H, the NE may insert a synchronization word 706 at the beginning of the LP-PSS 702, the one or more LP-SSSs 704, and the low power broadcast transmission 708. Thus, if the low power wireless device begins monitoring for and receiving the low power synchronization signal transmission in the middle of the LP-PSS 702 and / or the LP-SSS 704, then the low power wireless device may determine that the transmission is the LP-PSS 702 or the LP-SSS 704 and is followed by the LP-SSS 704 or the low power broadcast transmission 708, respectively, upon receiving the synchronization word 706 at the beginning of the LP-SSS 704 or the low power broadcast transmission 708. If the low power wireless device begins monitoring for and receiving the data transmission in the middle of the low power broadcast transmission 708, then the low power wireless device may determine that the transmission is the low power broadcast transmission 708 based on not receiving a synchronization word 706 at the end of the transmission. If the low power wireless device is able to receive the entire low power synchronization signal transmission, then the low power device may detect the LP-PSS 702 based on the synchronization word 706 prior to the transmission of the LP-PSS 702. The NE may utilize the same or different synchronization words 706 at the beginning of LP-PSS 702 and at the beginning of the one or more LP-SSSs 704.

[0094] In some other examples, such as for the transmission scheme I, the NE may insert a synchronization word 706 at the end of the LP-PSS 702. Thus, if the low power wireless device begins monitoring for and receiving the data transmission in the middle of the LP-PSS 702, then the low power wireless device may determine that the transmission is the LP-PSS 702 upon receiving the synchronization word 706. If the low power wireless device begins monitoring for and receiving the data transmission in the middle of the LP-SSS 704 and / or the low power broadcast transmission 708, then the low power wireless device may determine that the transmission is not the LP-PSS 702 based on not receiving a synchronization word 706.

[0095] In yet other examples, such as for the transmission scheme J, the NE may insert a synchronization word 706 at the end of the LP-PSS 702, the one or more LP-SSSs 704, and the low power broadcast transmission 708. Thus, if the low power wireless device begins monitoring for and receiving the low power synchronization signal transmission in the middle of the LP-PSS 702, the LP-SSS 704, or the low power broadcast transmission 708, then the low power wireless device may determine that the transmission is the LP-PSS 702, the LP-SSS 704, or the low power broadcast transmission 708 upon receiving the synchronization word 706. The NE may utilize the same or different synchronization words 706 at the end of LP-PSS 702, the LP-SSS 704, and / or the low power broadcast transmission 708.

[0096] In yet other examples, such as for the transmission scheme J, the NE may insert a synchronization word 706 at the end of the LP-PSS 702, the one or more LP-SSSs 704, the low power broadcast transmission 708, and after a preamble 710 (e.g., as described with reference to transmission scheme A in Ligure 4). The NE may utilize the same or different synchronization words 706 at the end of LP-PSS 702, the LP-SSS 704, the low power broadcast transmission 708, and / or the preamble 710.

[0097] In some examples, the NE may assemble a low power synchronization signal transmission followed by a data transmission. The low power synchronization signal transmission includes a numerical quantity of bits (e.g., X bits) for a LP-PSS 702, one or more synchronization words 706, one or more LP-SSSs 704, and / or low power broadcast transmission 708. The data transmission includes a numerical quantity of bits for the preamble 710 and the data 712. The NE may transmit the low power synchronization signal transmission and the data transmission to a low power wireless device. The low power wireless device may receive the synchronization word 706 at the beginning and / or end of the LP-PSS 702, LP-SSS 704, the low power broadcast transmission 708, the preamble 710, and / or the data 712. After receiving the synchronization word 706, the low power wireless device may proceed to demodulate the LP-PSS 702, LP-SSS 704, the low power broadcast transmission 708, the preamble 710, and / or the data 712.

[0098] Figure 8 illustrates an example of a process flow 800, in accordance with aspects of the present disclosure. In some examples, the process flow 800 may implement aspects of the wireless communications system 100, the wireless communications system 200, the wireless communications system 300, the transmission diagram 400, the transmission diagram 500, thetransmission diagram 600, and the transmission diagram 700. The process flow 800 may illustrate an example of a low power processor 302 receiving a low power synchronization signal according to a detected transmission pattern and receiving a cell ID indication from a NE 102. The low power processor 302 and the NE 102 may be examples of corresponding devices as described with reference to Figures 1 through 3. Alternative examples of the following may be implemented, where some processes are performed in a different order than described or are not performed. In some cases, processes may include additional features not mentioned below, or further processes may be added.

[0099] In some cases, at 802, the NE 102 may transmit a transmission pattern indication to the low power processor 302. The transmission pattern indication may include an indication of a transmission pattern the NE 102 is to use to transmit a low power synchronization signal. Additionally, or alternatively, the transmission pattern indication may include an indication of a set of transmission patterns. That is, the transmission pattern indication may preconfigure the transmission patterns at the low power processor 302 (e.g., in system information signaling).

[0100] At 804, the NE 102 may transmit a low power synchronization signal to the low power processor 302. The low power synchronization signal may include a portion of a cell ID of a serving cell that sent the low power synchronization signal (e.g., of the NE 102). The NE may send the low power synchronization signal using a transmission pattern from a set of preconfigured or otherwise defined transmission patterns and using an index modulation scheme.

[0101] At 806, the low power processor 302 may detect (e.g., blind detect) a transmission pattern used for the low power synchronization signal at 804. For example, the low power processor 302 may determine the low power synchronization signal is sent using the transmission pattern based on comparing the transmission pattern to a set of preconfigured transmission patterns.

[0102] In some examples, at 808, the low power processor 302 may identify a synchronization word utilized in the low power synchronization signal transmission to detect a low power synchronization signal (e.g., a LP-PSS, a LP-SSS, an on-demand low power synchronization signal, or a periodic low power synchronization signal).

[0103] At 810, the NE 102 may transmit a cell ID indication to the low power processor 302. The cell ID indication may include a remaining portion of a cell ID (e.g., the portion not included in the low power synchronization signal transmission at 804).

[0104] In some cases, at 812, the NE 102 may send a data transmission to the low power processor 302. In some examples, the data transmission includes a preamble and a payload. In some examples, the low power processor 302 may detect the preamble by correlating a sequence of the data transmission with the transmission pattern.

[0105] In some examples, one or more of the low power synchronization signal, the cell ID indication, and / or the data transmission may include one or more bits indicating a starting transmission frame of the respective signal (e.g., a synchronization word), as described with reference to Figures 4 through 7. The synchronization word may include any numerical quantity of bits and may be preconfigured or otherwise defined such that the low power processor 302 detects the synchronization word. For example, a preamble of the data transmission may include a synchronization word indicating a start or an end of the preamble. The low power processor 302 may demodulate the payload based on the synchronization word indicating the start or the end of the preamble.

[0106] In some examples, the low power synchronization signal is a LP-SSS, and the cell ID is included in a LP-SSS. In some other examples, the cell ID is included in a WUS, a broadcast signal, or the like. In some examples, the broadcast signal is a low power broadcast signal and includes one or more of a cell bearing, a frame number, or a TDD configuration for uplink or downlink communications. In some examples, the signaling carrying the cell ID is modulated using a same index modulation scheme as the low power synchronization signal. The low power synchronization signal may include an on-demand low power synchronization signal or a periodic low power synchronization signal. In some cases, the low power synchronization signal and / or the cell ID indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0107] Figure 9 illustrates an example of a process flow 900, in accordance with aspects of the present disclosure. In some examples, the process flow 900 may implement aspects of the wireless communications system 100, the wireless communications system 200, the wireless communications system 300, the transmission diagram 400, the transmission diagram 500, thetransmission diagram 600, and the transmission diagram 700. The process flow 900 may illustrate an example of a UE 104 with a main radio 204 and a low power radio 206 receiving a low power synchronization signal according to a detected transmission pattern and receiving a cell ID indication from a NE 102. The UE 104, the main radio 204, the low power radio 206, and the NE 102 may be examples of corresponding devices as described with reference to Figures 1 through 3. Alternative examples of the following may be implemented, where some processes are performed in a different order than described or are not performed. In some cases, processes may include additional features not mentioned below, or further processes may be added.

[0108] In some cases, at 902, the NE 102 may transmit a transmission pattern indication to the UE 104 (e.g., to the main radio 204 and / or to the low power radio 206). The transmission pattern indication may include an indication of a transmission pattern the NE 102 is to use to transmit a low power synchronization signal. Additionally, or alternatively, the transmission pattern indication may include an indication of a set of transmission patterns. That is, the transmission pattern indication may preconfigure the transmission patterns at UE 104 (e.g., in system information signaling). In some examples, the transmission pattern indication includes an explicit indication of a mapping between one or more synchronization signals (e.g., NR synchronization signals and low power synchronization signals) and a set of transmission patterns.

[0109] At 904, if the main radio 204 receives the indication of the transmission patterns, then the main radio 204 may indicate a transmission pattern the NE 102 is using to transmit a low power synchronization signal and / or a set of transmission patterns (e.g., preconfigured transmission patterns) to the low power radio 206. In some examples, the main radio 204 may determine the low power synchronization signal is transmitted using the transmission pattern based on the explicit indication of the mapping. In some other examples, the main radio 204 may be preconfigured with the mapping and may implicitly determine the low power synchronization signal is transmitted using the transmission pattern based on the mapping.

[0110] At 906, the NE 102 may transmit a low power synchronization signal to the low power radio 206. The low power synchronization signal may include a portion of a cell ID of a serving cell that sent the low power synchronization signal (e.g., of the NE 102). The NE may send the low power synchronization signal using a transmission pattern from a set of preconfigured or otherwise defined transmission patterns and using an index modulation scheme.

[0111] At 908, the NE 102 may transmit a cell ID indication to the low power radio 206. The cell ID indication may include a remaining portion of a cell ID (e.g., the portion not included in the low power synchronization signal transmission at 906).

[0112] In some examples, the low power synchronization signal is a LP-SSS, and the cell ID is included in a LP-SSS. In some other examples, the cell ID is included in a WUS, a broadcast signal, or the like. In some examples, the broadcast signal is a low power broadcast signal and includes one or more of a cell bearing, a frame number, or a TDD configuration for uplink or downlink communications. In some examples, the signaling carrying the cell ID is modulated using a same index modulation scheme as the low power synchronization signal. The low power synchronization signal may include an on-demand low power synchronization signal or a periodic low power synchronization signal. In some cases, the low power synchronization signal and / or the cell ID indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0113] Figure 10 illustrates an example of a UE 1000 in accordance with aspects of the present disclosure. The UE 1000 may include a processor 1002, a memory 1004, a controller 1006, and a transceiver 1008. The processor 1002, the memory 1004, the controller 1006, or the transceiver 1008, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0114] The processor 1002, the memory 1004, the controller 1006, or the transceiver 1008, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0115] The processor 1002 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 1002 may be configured to operate the memory 1004. In some other implementations, the memory 1004 may be integrated into the processor 1002. The processor 1002may be configured to execute computer-readable instructions stored in the memory 1004 to cause the UE 1000 to perform various functions of the present disclosure.

[0116] The memory 1004 may include volatile or non-volatile memory. The memory 1004 may store computer-readable, computer-executable code including instructions when executed by the processor 1002 cause the UE 1000 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 1004 or another type of memory. 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. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0117] In some implementations, the processor 1002 and the memory 1004 coupled with the processor 1002 may be configured to cause the UE 1000 to perform one or more of the functions described herein (e.g., executing, by the processor 1002, instructions stored in the memory 1004). For example, the processor 1002 may support wireless communication at the UE 1000 in accordance with examples as disclosed herein. In some cases, the UE 1000 may be configured to or operable to support means for receiving first signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme and receiving second signaling including an indication of a remaining portion of the cell ID.

[0118] Additionally, or alternatively, the UE 1000 may be configured to or operable to support any one or combination of determining the first signaling corresponds to the transmission pattern based on comparing the transmission pattern to a set of transmission patterns, the set of transmission patterns preconfigured at the UE 1000. Receiving, prior to receiving the first signaling, third signaling indicating the transmission pattern. Receiving, prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. In some examples, to receive one or more of the first signaling or the second signaling, the UE 1000 receives one or more bits indicating a starting transmission frame of the one or more of the first signaling or the second signaling. In some other examples, to receive one or more of the first signaling or the second signaling, the UE 1000 receives one or more bits indicating an ending transmission frame of the one or more of the first signaling or the second signaling. Receiving, based on the transmissionpattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble and demodulates the payload based on the one or more bits indicating the start or the end of the preamble. Detecting the preamble based on correlating a sequence of the data transmission with the transmission pattern. The low power synchronization signal is a LP-PSS and the second signaling includes a LP-SSS. The second signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The second signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic low power synchronization signal. The low power synchronization signal includes an on-demand low power synchronization signal. One or more of the first signaling or the second signaling indicate a Zadoff- Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0119] Additionally, or alternatively, the UE 1000 includes a low power radio and optionally a main radio, and may be configured to or operable to support any one or combination of receiving, via the main radio and prior to receiving the first signaling, third signaling indicating a mapping between one or more synchronization signals and a set of transmission patterns including the transmission pattern and determine the first signaling corresponds to the transmission pattern based on the mapping. Receiving, via the main radio and prior to receiving the first signaling, third signaling indicating the transmission pattern. Receiving, via the main radio and prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. Indicating the transmission pattern to the low power radio.

[0120] Additionally, or alternatively, the UE 1000 may support at least one memory and at least one processor coupled with the at least one memory and configured to cause the UE to receive first signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme and to receive second signaling including an indication of a remaining portion of the cell ID.

[0121] Additionally, the UE 1000 may be configured to support any one or combination of the at least one processor configured to determine the first signaling corresponds to the transmission pattern based on comparing the transmission pattern to a set of transmission patterns, the set of transmission patterns preconfigured at the UE 1000. The UE 1000 receives, prior to receiving thefirst signaling, third signaling indicating the transmission pattern. The UE 1000 receives, prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. In some examples, to receive one or more of the first signaling or the second signaling, the UE 1000 receives one or more bits indicating a starting transmission frame of the one or more of the first signaling or the second signaling. In some other examples, to receive one or more of the first signaling or the second signaling, the UE 1000 receives one or more bits indicating an ending transmission frame of the one or more of the first signaling or the second signaling. The UE 1000 receives, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble and demodulates the payload based on the one or more bits indicating the start or the end of the preamble. The UE 1000 detects the preamble based on correlating a sequence of the data transmission with the transmission pattern. The low power synchronization signal is a LP-PSS and the second signaling includes a LP-SSS. The second signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The second signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic low power synchronization signal. The low power synchronization signal includes an on-demand low power synchronization signal. One or more of the first signaling or the second signaling indicate a Zadoff-Chu sequence, a Golay sequence, an M- sequence, or a gold sequence.

[0122] Additionally, or alternatively, the UE 1000 includes a low power radio and optionally a main radio, and may be configured to support any one or combination of the at least one processor configured to receive, via the main radio and prior to receiving the first signaling, third signaling indicating a mapping between one or more synchronization signals and a set of transmission patterns including the transmission pattern and determine the first signaling corresponds to the transmission pattern based on the mapping. The UE 1000 further includes a main radio and receives, via the main radio and prior to receiving the first signaling, third signaling indicating the transmission pattern. The UE 1000 further includes a main radio and receives, via the main radio and prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. The UE 1000 indicates the transmission pattern to the low power radio.

[0123] The controller 1006 may manage input and output signals for the UE 1000. The controller 1006 may also manage peripherals not integrated into the UE 1000. In some implementations, the controller 1006 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 1006 may be implemented as part of the processor 1002.

[0124] In some implementations, the UE 1000 may include at least one transceiver 1008. In some other implementations, the UE 1000 may have more than one transceiver 1008. The transceiver 1008 may represent a wireless transceiver. The transceiver 1008 may include one or more receiver chains 1010, one or more transmitter chains 1012, or a combination thereof.

[0125] A receiver chain 1010 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 1010 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 1010 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 1010 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 1010 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.

[0126] A transmitter chain 1012 may be configured to generate and transmit signals(e.g., control information, data, packets). The transmitter chain 1012 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM), frequency modulation (FM), or digital modulation schemes like phase-shift keying (PSK) or quadrature amplitude modulation (QAM). The transmitter chain 1012 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 1012 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0127] Figure 11 illustrates an example of a processor 1100 in accordance with aspects of the present disclosure. The processor 1100 may be an example of a processor configured to performvarious operations in accordance with examples as described herein. The processor 1100 may include a controller 1102 configured to perform various operations in accordance with examples as described herein. The processor 1100 may optionally include at least one memory 1104, which may be, for example, an L1 / L2 / L3 cache. Additionally, or alternatively, the processor 1100 may optionally include one or more arithmetic-logic units (ALUs) 1106. One or more of these components may be in electronic communication or otherwise coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces (e.g., buses). In some examples, a low power processor implements one or more of the functionalities of the processor 1100.

[0128] The processor 1100 may be a processor chipset and include a protocol stack (e.g., a software stack) executed by the processor chipset to perform various operations (e.g., receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) in accordance with examples as described herein. The processor chipset may include one or more cores, one or more caches (e.g., memory local to or included in the processor chipset (e.g., the processor 1100) or other memory (e.g., random access memory (RAM), read-only memory (ROM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), static RAM (SRAM), ferroelectric RAM (FeRAM), magnetic RAM (MRAM), resistive RAM (RRAM), flash memory, phase change memory (PCM), and others).

[0129] The controller 1102 may be configured to manage and coordinate various operations (e.g., signaling, receiving, obtaining, retrieving, transmitting, outputting, forwarding, storing, determining, identifying, accessing, writing, reading) of the processor 1100 to cause the processor 1100 to support various operations in accordance with examples as described herein. For example, the controller 1102 may operate as a control unit of the processor 1100, generating control signals that manage the operation of various components of the processor 1100. These control signals include enabling or disabling functional units, selecting data paths, initiating memory access, and coordinating timing of operations.

[0130] The controller 1102 may be configured to fetch (e.g., obtain, retrieve, receive) instructions from the memory 1104 and determine subsequent instruction(s) to be executed to cause the processor 1100 to support various operations in accordance with examples as described herein. The controller 1102 may be configured to track memory addresses of instructions associated withthe memory 1104. The controller 1102 may be configured to decode instructions to determine the operation to be performed and the operands involved. For example, the controller 1102 may be configured to interpret the instruction and determine control signals to be output to other components of the processor 1100 to cause the processor 1100 to support various operations in accordance with examples as described herein. Additionally, or alternatively, the controller 1102 may be configured to manage flow of data within the processor 1100. The controller 1102 may be configured to control transfer of data between registers, ALUs 1106, and other functional units of the processor 1100.

[0131] The memory 1104 may include one or more caches (e.g., memory local to or included in the processor 1100 or other memory, such as RAM, ROM, DRAM, SDRAM, SRAM, MRAM, flash memory, etc. In some implementations, the memory 1104 may reside within or on a processor chipset (e.g., local to the processor 1100). In some other implementations, the memory 1104 may reside external to the processor chipset (e.g., remote to the processor 1100).

[0132] The memory 1104 may store computer-readable, computer-executable code including instructions that, when executed by the processor 1100, cause the processor 1100 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as system memory or another type of memory. The controller 1102 and / or the processor 1100 may be configured to execute computer-readable instructions stored in the memory 1104 to cause the processor 1100 to perform various functions. For example, the processor 1100 and / or the controller 1102 may be coupled with or to the memory 1104, the processor 1100, and the controller 1102, and may be configured to perform various functions described herein. In some examples, the processor 1100 may include multiple processors and the memory 1104 may include multiple memories. One or more of the multiple processors may be coupled with one or more of the multiple memories, which may, individually or collectively, be configured to perform various functions herein.

[0133] The one or more ALUs 1106 may be configured to support various operations in accordance with examples as described herein. In some implementations, the one or more ALUs 1106 may reside within or on a processor chipset (e.g., the processor 1100). In some other implementations, the one or more ALUs 1106 may reside external to the processor chipset (e.g., the processor 1100). One or more ALUs 1106 may perform one or more computations such as addition,subtraction, multiplication, and division on data. For example, one or more ALUs 1106 may receive input operands and an operation code, which determines an operation to be executed. One or more ALUs 1106 may be configured with a variety of logical and arithmetic circuits, including adders, subtractors, shifters, and logic gates, to process and manipulate the data according to the operation. Additionally, or alternatively, the one or more ALUs 1106 may support logical operations such as AND, OR, exclusive-OR (XOR), not-OR (NOR), and not-AND (NAND), enabling the one or more ALUs 1106 to handle conditional operations, comparisons, and bitwise operations.

[0134] The processor 1100 may support wireless communication in accordance with examples as disclosed herein. The processor 1100 may be configured to or operable to support at least one controller coupled with at least one memory and configured to cause the processor to receive first signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme and receive second signaling including an indication of a remaining portion of the cell ID.

[0135] Additionally, or alternatively, the processor 1100 may be configured to or operable to support any one or combination of to determine the first signaling corresponds to the transmission pattern based on comparing the transmission pattern to a set of transmission patterns, the set of transmission patterns preconfigured at the processor 1100. The processor 1100 receives, prior to receiving the first signaling, third signaling indicating the transmission pattern. The processor 1100 receives, prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern. In some examples, to receive one or more of the first signaling or the second signaling, the processor 1100 receives one or more bits indicating a starting transmission frame of the one or more of the first signaling or the second signaling. In some other examples, to receive one or more of the first signaling or the second signaling, the processor 1100 receives one or more bits indicating an ending transmission frame of the one or more of the first signaling or the second signaling. The processor 1100 receives, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble and demodulates the payload based on the one or more bits indicating the start or the end of the preamble. The processor 1100 detects the preamble based on correlating a sequence of the data transmission with the transmission pattern. The lowpower synchronization signal is a LP-PSS and the second signaling includes a LP-SSS. The second signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The second signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic low power synchronization signal. The low power synchronization signal includes an on-demand low power synchronization signal. One or more of the first signaling or the second signaling indicate a Zadoff- Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0136] Additionally, or alternatively, the processor 1100 may be configured to or operable to support any one or combination of to receive, via a main radio and prior to receiving the first signaling, third signaling indicating a mapping between one or more synchronization signals and a set of transmission patterns including the transmission pattern and determine the first signaling corresponds to the transmission pattern based on the mapping. The processor 1100 receives, via the main radio and prior to receiving the first signaling, third signaling indicating the transmission pattern. The processor 1100 receives, via the main radio and prior to receiving the first signaling, third signaling indicating a set of transmission patterns including the transmission pattern.Indicating the transmission pattern to the low power radio.

[0137] Figure 12 illustrates an example of a NE 1200 in accordance with aspects of the present disclosure. The NE 1200 may include a processor 1202, a memory 1204, a controller 1206, and a transceiver 1208. The processor 1202, the memory 1204, the controller 1206, or the transceiver 1208, or various combinations thereof or various components thereof may be examples of means for performing various aspects of the present disclosure as described herein. These components may be coupled (e.g., operatively, communicatively, functionally, electronically, electrically) via one or more interfaces.

[0138] The processor 1202, the memory 1204, the controller 1206, or the transceiver 1208, or various combinations or components thereof may be implemented in hardware (e.g., circuitry). The hardware may include a processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or other programmable logic device, or any combination thereof configured as or otherwise supporting a means for performing the functions described in the present disclosure.

[0139] The processor 1202 may include an intelligent hardware device (e.g., a general-purpose processor, a DSP, a CPU, an ASIC, an FPGA, or any combination thereof). In some implementations, the processor 1202 may be configured to operate the memory 1204. In some other implementations, the memory 1204 may be integrated into the processor 1202. The processor 1202 may be configured to execute computer-readable instructions stored in the memory 1204 to cause the NE 1200 to perform various functions of the present disclosure.

[0140] The memory 1204 may include volatile or non-volatile memory. The memory 1204 may store computer-readable, computer-executable code including instructions when executed by the processor 1202 cause the NE 1200 to perform various functions described herein. The code may be stored in a non-transitory computer-readable medium such as the memory 1204 or another type of memory. 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. A non-transitory storage medium may be any available medium that may be accessed by a general-purpose or special-purpose computer.

[0141] In some implementations, the processor 1202 and the memory 1204 coupled with the processor 1202 may be configured to cause the NE 1200 to perform one or more of the functions described herein (e.g., executing, by the processor 1202, instructions stored in the memory 1204). For example, the processor 1202 may support wireless communication at the NE 1200 in accordance with examples as disclosed herein. The NE 1200 may be configured to or operable to support means for transmitting first signaling indicating a set of transmission patterns associated with an index modulation scheme, transmitting second signaling based on selecting a transmission pattern of the set of transmission patterns, the second signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, and transmitting third signaling including an indication of a remaining portion of the cell ID.

[0142] Additionally, or alternatively, the NE 1200 may be configured to or operable to support means for any one or combination of transmitting, prior to transmitting the first signaling, fourth signaling indicating the transmission pattern. Transmitting, prior to transmitting the first signaling, fourth signaling indicating a mapping between one or more synchronization signals and the set of transmission patterns. To transmit one or more of the second signaling or the third signaling, transmitting one or more bits indicating a starting transmission frame of the one or more of thesecond signaling or the third signaling. To transmit one or more of the second signaling or the third signaling, transmitting one or more bits indicating an ending transmission frame of the one or more of the second signaling or the third signaling. Transmitting, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble. The low power synchronization signal is a LP-PSS and the third signaling includes a LP-SSS. The third signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The third signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic synchronization signal. The low power synchronization signal includes an on-demand synchronization signal. One or more of the second signaling or the third signaling indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0143] Additionally, or alternatively, the NE 1200 may support at least one memory and at least one processor coupled with the at least one memory and configured to cause the NE 1200 to transmit first signaling indicating a set of transmission patterns associated with an index modulation scheme, transmit second signaling based on selecting a transmission pattern of the set of transmission patterns, the second signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, and transmit third signaling including an indication of a remaining portion of the cell ID.

[0144] Additionally, the NE 1200 may be configured to support any one or combination of the at least one processor configured to transmit, prior to transmitting the first signaling, fourth signaling indicating the transmission pattern. The NE 1200 transmits, prior to transmitting the first signaling, fourth signaling indicating a mapping between one or more synchronization signals and the set of transmission patterns. To transmit one or more of the second signaling or the third signaling, the NE 1200 transmits one or more bits indicating a starting transmission frame of the one or more of the second signaling or the third signaling. To transmit one or more of the second signaling or the third signaling, the NE 1200 transmits one or more bits indicating an ending transmission frame of the one or more of the second signaling or the third signaling. The NE 1200 transmits, based on the transmission pattern, a data transmission including a preamble and a payload, where the preamble includes one or more bits indicating a start or an end of the preamble.The low power synchronization signal is a LP-PSS and the third signaling includes a LP-SSS. The third signaling includes one or more of a WUS or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a TDD configuration. The third signaling is modulated using the index modulation scheme. The low power synchronization signal includes a periodic synchronization signal. The low power synchronization signal includes an on-demand synchronization signal. One or more of the second signaling or the third signaling indicate a Zadoff- Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

[0145] The controller 1206 may manage input and output signals for the NE 1200. The controller 1206 may also manage peripherals not integrated into the NE 1200. In some implementations, the controller 1206 may utilize an operating system such as iOS®, ANDROID®, WINDOWS®, or other operating systems. In some implementations, the controller 1206 may be implemented as part of the processor 1202.

[0146] In some implementations, the NE 1200 may include at least one transceiver 1208. In some other implementations, the NE 1200 may have more than one transceiver 1208. The transceiver 1208 may represent a wireless transceiver. The transceiver 1208 may include one or more receiver chains 1210, one or more transmitter chains 1212, or a combination thereof.

[0147] A receiver chain 1210 may be configured to receive signals (e.g., control information, data, packets) over a wireless medium. For example, the receiver chain 1210 may include one or more antennas to receive a signal over the air or wireless medium. The receiver chain 1210 may include at least one amplifier (e.g., a low-noise amplifier (LNA)) configured to amplify the received signal. The receiver chain 1210 may include at least one demodulator configured to demodulate the receive signal and obtain the transmitted data by reversing the modulation technique applied during transmission of the signal. The receiver chain 1210 may include at least one decoder for decoding the demodulated signal to receive the transmitted data.

[0148] A transmitter chain 1212 may be configured to generate and transmit signals(e.g., control information, data, packets). The transmitter chain 1212 may include at least one modulator for modulating data onto a carrier signal, preparing the signal for transmission over a wireless medium. The at least one modulator may be configured to support one or more techniques such as amplitude modulation (AM), frequency modulation (FM), or digital modulation schemeslike phase-shift keying (PSK) or quadrature amplitude modulation (QAM). The transmitter chain 1212 may also include at least one power amplifier configured to amplify the modulated signal to an appropriate power level suitable for transmission over the wireless medium. The transmitter chain 1212 may also include one or more antennas for transmitting the amplified signal into the air or wireless medium.

[0149] Figure 13 illustrates a flowchart of a method 1300 in accordance with aspects of the present disclosure. The operations of the method may be implemented by a processor (e.g., a low power processor) as described herein. In some implementations, the processor may execute a set of instructions to control the function elements of the processor to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0150] At 1302, the method may include receiving first signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme. The operations of 1302 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1302 may be performed by a processor as described with reference to Figure 11.

[0151] At 1304, the method may include receiving second signaling including an indication of a remaining portion of the cell ID. The operations of 1304 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1304 may be performed by a processor as described with reference to Figure 11.

[0152] Figure 14 illustrates a flowchart of a method 1400 in accordance with aspects of the present disclosure. The operations of the method may be implemented by a UE as described herein. In some implementations, the UE may execute a set of instructions to control the function elements of the UE to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible. Further, some of the operations and steps may be optional.

[0153] In some examples, at 1402, the method may include receiving, via a main radio of the UE and prior to receiving first signaling, third signaling indicating a transmission pattern associated with an index modulation scheme. The operations of 1402 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1402 may be performed by a UE as described with reference to Figure 10.

[0154] At 1404, the method may include receiving, via a low power radio, the first signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell, the first signaling corresponding to the transmission pattern. The operations of 1404 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1404 may be performed by a UE as described with reference to Figure 10.

[0155] At 1406, the method may include receiving second signaling including an indication of a remaining portion of the cell ID. The operations of 1406 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1406 may be performed by a UE as described with reference to Figure 10.

[0156] Figure 15 illustrates a flowchart of a method 1500 in accordance with aspects of the present disclosure. The operations of the method may be implemented by a NE as described herein. In some implementations, the NE may execute a set of instructions to control the function elements of the NE to perform the described functions. It should be noted that the method described herein describes a possible implementation, and that the operations and the steps may be rearranged or otherwise modified and that other implementations are possible.

[0157] At 1502, the method may include transmitting first signaling indicating a set of transmission patterns associated with an index modulation scheme. The operations of 1502 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1502 may be performed by a NE as described with reference to Figure 12.

[0158] At 1504, the method may include transmitting second signaling based on selecting a transmission pattern of the set of transmission patterns, the second signaling including a low power synchronization signal and a portion of a cell ID associated with a serving cell. The operations of 1504 may be performed in accordance with examples as described herein. In some implementations,aspects of the operations of 1504 may be performed by a NE as described with reference to Figure 12.

[0159] At 1506, the method may include transmitting third signaling including an indication of a remaining portion of the cell ID. The operations of 1506 may be performed in accordance with examples as described herein. In some implementations, aspects of the operations of 1506 may be performed by a NE as described with reference to Figure 12.

[0160] The description herein is provided to enable a person having ordinary skill in the art to make or use the disclosure. Various modifications to the disclosure will be apparent to a person having ordinary skill in the art, and the generic principles defined herein may be applied to other variations without departing from the scope of the disclosure. Thus, the disclosure is not limited to the examples and designs described herein but is to be accorded the broadest scope consistent with the principles and novel features disclosed herein.

Claims

CLAIMSWhat is claimed is:

1. A low power processor for wireless communication, comprising: at least one controller coupled with at least one memory and configured to cause the low power processor to: receive first signaling comprising a low power synchronization signal and a portion of a cell identifier associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme; and receive second signaling comprising an indication of a remaining portion of the cell identifier.

2. The low power processor of claim 1 , wherein the at least one controller is further configured to cause the low power processor to determine the first signaling corresponds to the transmission pattern based at least in part on comparing the transmission pattern to a plurality of transmission patterns, the plurality of transmission patterns preconfigured at the low power processor.

3. The low power processor of claim 1, wherein the at least one controller is further configured to cause the low power processor to receive, prior to receiving the first signaling, third signaling indicating the transmission pattern.

4. The low power processor of claim 1, wherein the at least one controller is further configured to cause the low power processor to receive, prior to receiving the first signaling, third signaling indicating a plurality of transmission patterns comprising the transmission pattern.

5. The low power processor of claim 1, wherein to receive one or more of the first signaling or the second signaling, the at least one controller is further configured to cause the low power processor to receive one or more bits indicating a starting transmission frame of the one or more of the first signaling or the second signaling.

6. The low power processor of claim 1 , wherein to receive one or more of the first signaling or the second signaling, the at least one controller is further configured to cause the lowpower processor to receive one or more bits indicating an ending transmission frame of the one or more of the first signaling or the second signaling.

7. The low power processor of claim 1, wherein the at least one controller is further configured to cause the low power processor to: receive, based at least in part on the transmission pattern, a data transmission comprising a preamble and a payload, wherein the preamble comprises one or more bits indicating a start or an end of the preamble; and demodulate the payload based at least in part on the one or more bits indicating the start or the end of the preamble.

8. The low power processor of claim 7, wherein the at least one controller is further configured to cause the low power processor to detect the preamble based at least in part on correlating a sequence of the data transmission with the transmission pattern.

9. The low power processor of claim 1, wherein: the low power synchronization signal is a low power-primary synchronization signal (LP-PSS); and the second signaling comprises a low power-secondary synchronization signal (LP-SSS).

10. The low power processor of claim 1, wherein the second signaling comprises one or more of a wake-up signal (WUS) or a broadcast signal corresponding to one or more of a cell bearing, a frame number, or a time division duplex (TDD) configuration.

11. The low power processor of claim 1 , wherein the second signaling is modulated using the index modulation scheme.

12. The low power processor of claim 1, wherein the low power synchronization signal comprises a periodic low power synchronization signal.

13. The low power processor of claim 1, wherein the low power synchronization signal comprises an on-demand low power synchronization signal.

14. The low power processor of claim 1, wherein one or more of the first signaling or the second signaling indicate a Zadoff-Chu sequence, a Golay sequence, an M-sequence, or a gold sequence.

15. A UE for wireless communication, comprising: a low power radio; at least one memory; and at least one processor coupled with the at least one memory and configured to cause the UE to: receive, via the low power radio, first signaling comprising a low power synchronization signal and a portion of a cell identifier associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme; and receive second signaling comprising an indication of a remaining portion of the cell identifier.

16. The UE of claim 15, wherein the UE further comprises a main radio, and the at least one processor is further configured to cause the UE to: receive, via the main radio and prior to receiving the first signaling, third signaling indicating a mapping between one or more synchronization signals and a plurality of transmission patterns comprising the transmission pattern; and determine the first signaling corresponds to the transmission pattern based at least in part on the mapping.

17. The UE of claim 15, wherein the UE further comprises a main radio, and wherein the at least one processor is further configured to cause the UE to receive, via the main radio and prior to receiving the first signaling, third signaling indicating the transmission pattern.

18. The UE of claim 15, wherein the UE further comprises a main radio, and wherein the at least one processor is further configured to cause the UE to receive, via the main radio and prior to receiving the first signaling, third signaling indicating a plurality of transmission patterns comprising the transmission pattern.

19. A method performed by a low power processor, the method comprising: receiving first signaling comprising a low power synchronization signal and a portion of a cell identifier associated with a serving cell, the first signaling corresponding to a transmission pattern associated with an index modulation scheme; and receiving second signaling comprising an indication of a remaining portion of the cell identifier.

20. A network equipment (NE) for wireless communication, comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the NE to: transmit first signaling indicating a plurality of transmission patterns associated with an index modulation scheme; transmit second signaling based at least in part on selecting a transmission pattern of the plurality of transmission patterns, the second signaling comprising a low power synchronization signal and a portion of a cell identifier associated with a serving cell; and transmit third signaling comprising an indication of a remaining portion of the cell identifier.

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