Wireless communication method, terminal device, and network device

Abstract

Provided are a wireless communication method, a terminal device, and a network device. The wireless communication method comprises: a terminal device receives an LP-SS sent by a network device, the LP-SS occupying a plurality of OFDM symbols, and each of the plurality of OFDM symbols comprising a CP.

Description

Wireless communication methods, terminal devices, and network devices Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a wireless communication method, terminal device, and network device. Background Technology

[0002] To achieve energy savings in terminal devices, these devices can use a low-power wake-up receiver (LP-WUR) to listen for wake-up signals. When the terminal device receives a wake-up signal from the network device, the LP-WUR wakes up the main receiver. In this scenario, the LP-WUR can synchronize or measure with the serving cell using a low-power synchronization signal (LP-SS). Therefore, the design of the LP-SS becomes a crucial issue that needs to be addressed.

[0003] Summary of the Invention

[0004] This application provides a wireless communication method, terminal device, and network device. The various aspects covered by this application are described below.

[0005] In a first aspect, a wireless communication method is provided, comprising: a terminal device receiving an LP-SS transmitted by a network device, wherein the LP-SS occupies a plurality of orthogonal frequency division multiplexing (OFDM) symbols, and each of the plurality of OFDM symbols contains a cyclic prefix (CP).

[0006] In a second aspect, a wireless communication method is provided, comprising: a network device sending an LP-SS to a terminal device, wherein the LP-SS occupies a plurality of OFDM symbols, and each OFDM symbol among the plurality of OFDM symbols contains a CP.

[0007] Thirdly, a terminal device is provided, comprising: a receiving module for receiving LP-SS sent by a network device, wherein the LP-SS occupies multiple OFDM symbols, and each OFDM symbol among the multiple OFDM symbols contains a CP.

[0008] Fourthly, a network device is provided, comprising: a transmitting module for transmitting LP-SS to a terminal device, wherein the LP-SS occupies multiple OFDM symbols, and each OFDM symbol among the multiple OFDM symbols contains a CP.

[0009] Fifthly, a terminal device is provided, including a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to invoke the computer programs in the memory to cause the terminal device to perform some or all of the steps in the method of the first aspect.

[0010] In a sixth aspect, a network device is provided, including a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to invoke the computer programs in the memory to cause the network device to perform some or all of the steps in the method of the second aspect.

[0011] Seventhly, embodiments of this application provide a communication system including the aforementioned terminal device and / or network device. In another possible design, the system may further include other devices that interact with the terminal device or network device as described in the embodiments of this application.

[0012] Eighthly, embodiments of this application provide a computer-readable storage medium storing a computer program that causes a computer to perform some or all of the steps in the methods described above.

[0013] Ninthly, embodiments of this application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program operable to cause a computer to perform some or all of the steps of the methods described in the foregoing aspects. In some implementations, the computer program product may be a software installation package.

[0014] In a tenth aspect, embodiments of this application provide a chip including a memory and a processor, the processor being able to call and run a computer program from the memory to implement some or all of the steps described in the methods of the foregoing aspects.

[0015] In the embodiments of this application, the LP-SS occupying multiple OFDM symbols is beneficial to improving synchronization accuracy and channel estimation accuracy. Furthermore, each OFDM symbol in the multiple OFDM symbols contains a CP, which is beneficial to reducing inter-symbol interference and inter-carrier interference. Attached Figure Description

[0016] Figure 1 is a system architecture example diagram of a wireless communication system applicable to embodiments of this application.

[0017] Figure 2 is an example diagram of the performance requirements of the binary sequence of LP-SS provided in the embodiments of this application.

[0018] Figure 3 is a flowchart illustrating a wireless communication method provided in an embodiment of this application.

[0019] Figure 4A is an example diagram of adding a CP to an LP-SS according to an embodiment of this application.

[0020] Figure 4B is an example diagram of adding a CP to an LP-SS according to another embodiment of this application.

[0021] Figure 5 is an example diagram of the sequence evaluation results provided in an embodiment of this application.

[0022] Figure 6 is an example diagram of sequence evaluation results provided by another embodiment of this application.

[0023] Figure 7A is an example diagram of sequence evaluation results provided in another embodiment of this application.

[0024] Figure 7B is an example diagram of sequence evaluation results provided in another embodiment of this application.

[0025] Figure 8 is a flowchart illustrating a wireless communication method provided in another embodiment of this application.

[0026] Figure 9 is a schematic diagram of the structure of the terminal device provided in the embodiment of this application.

[0027] Figure 10 is a schematic diagram of the network device provided in an embodiment of this application.

[0028] Figure 11 is a schematic structural diagram of the communication device provided in an embodiment of this application. Detailed Implementation

[0029] Communication system architecture

[0030] Figure 1 is a system architecture example diagram of a wireless communication system 100 to which embodiments of this application can be applied. The wireless communication system 100 may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120. The network device 110 may provide communication coverage for a specific geographical area and may communicate with the terminal device 120 located within that coverage area.

[0031] Figure 1 illustrates an exemplary network device and two terminal devices. Optionally, the wireless communication system 100 may include multiple network devices, and each network device may include other numbers of terminal devices within its coverage area. This application embodiment does not limit this.

[0032] Optionally, the wireless communication system 100 may also include other network entities such as a network controller and a mobility management entity, which is not limited in this embodiment.

[0033] It should be understood that the technical solutions of the embodiments of this application can be applied to various communication systems, such as: 5th generation (5G) systems or new radio (NR), long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided in this application can also be applied to future communication systems, such as 6th generation mobile communication systems, satellite communication systems, and so on.

[0034] The terminal device in this application embodiment can also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user device. The terminal device in this application embodiment can be a device that provides voice and / or data connectivity to a user, and can be used to connect people, objects, and machines, such as a handheld device with wireless connectivity, vehicle-mounted device, etc. The terminal devices in the embodiments of this application can be mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, self-driving, remote medical surgery, smart grids, transportation safety, smart cities, and smart homes, etc. Optionally, the UE can act as a base station. For example, the UE can act as a scheduling entity, providing sidelink signals between UEs in V2X or D2D, etc. For example, cellular phones and cars communicate with each other using sidelink signals. Cellular phones and smart home devices communicate without relaying communication signals through a base station.

[0035] The network device in this application embodiment can be a device for communicating with a terminal device. This network device can also be called an access network device or a wireless access network device, such as a base station. In this application embodiment, the network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. A base station can broadly encompass, or be replaced by, various names including: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, transmitting and receiving point (TRP), transmitting point (TP), master MeNB, auxiliary SeNB, multi-mode radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station can be a macro base station, micro base station, relay node, donor node, or similar, or a combination thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. Base stations can also be mobile switching centers, devices that perform base station functions in device-to-device (D2D), vehicle-to-everything (V2X), and machine-to-machine (M2M) communications, network-side devices in 6G networks, and devices that perform base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or device forms used in the network equipment.

[0036] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

[0037] In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0038] Network devices and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices and terminal devices are located.

[0039] It should be understood that all or part of the functions of the communication device in this application can also be implemented by software functions running on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

[0040] For ease of understanding, the relevant technologies involved in this application will be introduced below. It should be noted that the content described below can be combined with this application in any way, and it is also part of the embodiments of this application.

[0041] Wake-up signal (WUS) / Wake-up receiver (WUR)

[0042] To further enhance energy efficiency in terminal devices, some research projects (such as 3GPP Release 18) have introduced low-power WURs (LP-WURs) and designed corresponding low-power WUSs (LP-WUSs). Specifically, terminal devices can listen to WUSs (such as LP-WUSs) via LP-WURs. When a terminal device receives a WUS sent by a network device, the LP-WUR wakes up the main receiver (MR). While the terminal device is listening to WUSs via LP-WURs, the MR can be in an extremely low-power state (e.g., ultra-deep sleep), thereby achieving overall energy savings for the terminal device.

[0043] In 3GPP Release 18, LP-WUS / WUR was studied, resulting in research report TR 38.869. In 3GPP Release 19, LP-WUS / WUR was standardized. The following section introduces some of the standardization content and objectives in Release 19.

[0044] R19 standardizes a universal LP-WUS design (RAN1, RAN4) that can be applied simultaneously to both idle / inactive and connected states. The standardization is based on on-off keying (OOK) LP-WUS signals, and orthogonal frequency division multiplexing (OFDM) sequences can be superimposed on the OOK symbols. For example, OOK can include OOK-1 and / or OOK-4. The LP-WUS design should ensure that, in the idle / inactive states, regardless of the receiver design used, the LP-WUS transmits the same information. Simultaneously, the OFDM sequence can also carry information. LP-WUS can at least support duty-cycled listening.

[0045] For the IDLE / INACTIVE state, the relevant technical standardization procedures and configurations for LP-WUS to trigger listening to paging messages include at least: "Configuration", "Subgroup" and "Conditions for entering / exiting LP-WUS listening" (RAN2, RAN1, RAN3, RAN4).

[0046] Additionally, for the IDLE / INACTIVE state, the relevant technology is LP-SS with a LP-WUR standardization period of Yms. LP-SS can be used for synchronization and / or radio resource management (RRM) of the serving cell (RAN1, RAN4). LP-SS can be based on OOK-1 and / or OOK-4 waveforms, and OFDM sequences can be superimposed on the OOK symbols with or without superimposing. The choice of whether to superimpose OFDM sequences on LP-SS is made in the work item (WI).

[0047] It should be noted that for LP-WUR that can receive the primary synchronization signal (PSS) / secondary synchronization signal (SSS) in related technologies, the PSS / SSS signals in related technologies can be used to replace LP-SS for synchronization and RRM.

[0048] It should also be noted that the value of Y needs to be determined during the WI phase. For example, 320ms can be used as an initial value for Y.

[0049] Furthermore, for the IDLE / INACTIVE state, the relevant technologies further standardize the RRM relaxation for the terminal equipment's main receiver measurements in the serving cell and neighboring cells. The RRM measurement of the terminal equipment's serving cell can be decentralized from the main receiver to the LP-WUR, including the necessary condition design (RAN4, RAN2).

[0050] For the CONNECTED state, the relevant technical standardization describes the process by which the master receiver of the LP-WUS-triggered terminal device listens to the physical downlink control channel (PDCCH), including the activation and deactivation processes of LP-WUS (RAN2, RAN1). For example, the time unit (TU) adjustment for RAN2 is considered in the RAN#105 meeting.

[0051] It should be noted that in CONNECTED state, the main receiver of the terminal device will not enter a deep sleep state. The radio resources (RR), radio link monitoring (RLM), beam failure detection (BFD), and channel state information (CSI) measurements of the terminal device are performed by the main receiver.

[0052] It should be noted that the coverage performance of LP-WUS and LP-SS is close to that of Physical Uplink Shared Channel (PUSCH) message 3 (msg3).

[0053] It should be noted that the priority of LP-WUS signal optimization design in the IDLE / INACTIVE state is higher than that in the CONNECTED state.

[0054] LP-SS

[0055] During the 3GPP standardization organization's meeting, preliminary conclusions were reached on the waveform and signal design of LP-SS, and the main conclusions are as follows.

[0056] For the waveform design of LP-SS, further research is needed on the waveform design of LP-SS under the following options 1 and 2, where, option 1: OOK-1; option 2: OOK-4 with M = 1, 2, 4, [8] (OOK-4 with M = 1, 2, 4, [8]). The value of M is the number of OOK symbols transmitted within an OFDM symbol.

[0057] It should be noted that the subcarrier spacing (SCS) used to generate CP-OFDM symbols for LP-SS is the same as the SCS used to generate CP-OFDM symbols for LP-WUS. However, this application is not limited to this, and different SCSs may be further investigated in the future.

[0058] In some embodiments, the 'on-off' pattern for OOK symbols of LP-SS is determined based on binary sequence(s).

[0059] It should be noted that future research may delve deeper into the details of binary sequences, including sequence type, number of sequences, and sequence length.

[0060] It should be noted that, if supported, further research on overlaid OFDM sequences may be conducted in the future.

[0061] In some embodiments, the number of binary LP-SS sequences is 4.

[0062] In some embodiments, in order to determine the binary sequence of LP-SS, it is necessary to formulate some evaluation assumptions. These evaluation assumptions are described below.

[0063] Regarding synchronization accuracy: At least for a signal-to-noise ratio (SNR) of -3dB and -6dB (lower priority), the timing estimation error is smaller than T microseconds (µs) for 90% of the time. Here, P represents the confidence interval.

[0064] In some embodiments, for the OOK-1 scenario, T = 2µs (optional) or 5µs.

[0065] In some embodiments, for a scenario with M=2 OOK-4, T=1us (optional), 2us.

[0066] In some embodiments, for a scenario with M=4 OOK-4, T=0.5us (optional), 1us.

[0067] It should be noted that for cases where SNR is other values, the values ​​of T and M mentioned above shall be based on the company's report.

[0068] It should also be noted that companies can submit results for the signal-to-interference-plus-noise ratio (SINR) and a detailed explanation of how the interference was simulated.

[0069] It should also be noted that the above evaluation assumptions apply to the assumption of one-shot estimation.

[0070] It should also be noted that the timing error is determined based on the 20ppm maximum frequency error for the detection of the first LP-SS.

[0071] It should also be noted that companies may assume other values ​​within the maximum value of 20 ppm, as long as these values ​​are reasonable.

[0072] Regarding RRM measurement accuracy: Within a period, for Q = 90% of measurements based on Y LP-SS samples, the measurement accuracy is comparable to Z within ±XdB, where Z is the length of the inactive discontinuous reception (I-DRX) cycle that is larger or equal to 1.28s for at least SNR = -3dB and SNR = -6dB (lower priority). X, Y, and Z are based on company reports, and other SNR values ​​are based on company reports.

[0073] It should be noted that, as a starting point, the time error is determined based on a residual frequency error of 5-10 ppm.

[0074] It should also be noted that 5-10ppm assumes that frequency error correction is performed, e.g., RTC calibration and / or MR assistance.

[0075] It should also be noted that companies may assume values ​​other than 5-10 ppm, as long as these values ​​are reasonable.

[0076] Regarding frequency error: This depends on the company's report.

[0077] Regarding the sampling rate: Assuming a 30kHz SCS, the sampling rate is 3.84MHz (optional) or 7.68MHz.

[0078] Regarding the channels: We assume an additive white Gaussian noise (AWGN) model and a tapped delay line (TDL) model. The TDL model can be TDL-C 300ns.

[0079] It should be noted that, when considering time and frequency errors, the relevant techniques need to take into account the cross-correlation of the four binary sequences.

[0080] It should also be noted that companies are encouraged to provide detailed information on other additional simulation assumptions, a high-level description of their receiver algorithm, and an assessment of power consumption.

[0081] In some embodiments, to determine the binary sequence of LP-SS, for each M value, the length L of the binary sequence can be selected downwards from the corresponding candidate values. Wherein, for M=1, L={4, 6, 8}; for M=2, L={8, 12, 16, 24}; for M=4, L={16, 24, 32, 46}.

[0082] It should be noted that future research may explore whether one or more L values ​​are applied to each M value (M = 1, 2, 4).

[0083] It should also be noted that future research may explore whether the L value can be applied to other applicable SCSs.

[0084] It should also be noted that future research may focus on the L values ​​corresponding to other M values, provided that other M values ​​are supported.

[0085] It should also be noted that future research may focus on whether time estimation is averaged across multiple LP-SS occasions when multiple LP-SS occasions are applied.

[0086] It should also be noted that for sequence length L, Manchester encoding is included (if LP-SS is supported).

[0087] It should also be noted that this does not preclude any of the three agreed sequence types.

[0088] It should also be noted that the above applies at least to 15kHz and 30kHz.

[0089] In some embodiments, in order to determine the binary sequence of LP-SS, the following performance comparison needs to be considered, and the various metrics for the performance comparison can be seen in Figure 2.

[0090] For synchronization accuracy T': the achieved synchronization accuracy T' for a set of 4 sequences with the same number of occupied OFDM symbols (timing estimation error smaller than T'us for at least SNR = -3dB and SNR = -6dB (low priority)) within 90% of the time. As one implementation, it is assumed that the sliding time window is at least [-25us, 25us].

[0091] For RRM measurement accuracy X: Within one cycle, for a measurement based on Y LP-SS samples with Q = 90%, the achieved measurement accuracy within the range ±X dB is comparable to Z, where Z is the length of the I-DRX cycle that is larger than or equal to 1.28 s. As one implementation, based on Y = 1, 4 and Z = 1.28 s, it is assumed that X = 3.5 dB should be satisfied for LP-RSRP and LP-RSRQ.

[0092] For cross-correlation: the maximum cross-correlation value or the maximum autocorrelation value. Future research may explore how to use cross-correlation for comparison.

[0093] It should be noted that inter-cell interference can be referenced to the RAN4 RRM assumption.

[0094] In some embodiments, LP-SS may support overlay OFDM sequences. In some embodiments, LP-SS may reuse overlay OFDM sequences defined for LP-WUS. This design regarding overlay OFDM sequences designed for LP-WUS is not aimed at the synchronization and RRM measurement performance of LP-SS-based overlay OFDM sequences. In some embodiments, whether to use defined overlay OFDM sequences for LP-SS transmission is configurable. In some embodiments, LP-SS overlay OFDM sequences are applicable at least to OOK-1, and future investigations may explore their applicability to OOK-4.

[0095] It should be noted that, from the perspective of RAN1, there is no intention to introduce new RAN4 requirements for superimposed sequences.

[0096] As can be seen from the above description, under the 3GPP LP-WUS / LP-WUR project, considering the synchronization performance of LP-WUR, a new LP-SS needs to be designed for WUR. This LP-SS first determines the on-off OOK symbol pattern based on a binary sequence, and further, an OFDM sequence can be superimposed on each on symbol. However, the specific design of the LP-SS, i.e., how the values ​​of the binary sequence of the LP-SS are designed, is still undefined.

[0097] To address the aforementioned issues, this application provides an LP-SS design scheme. This LP-SS can occupy multiple OFDM symbols, and each of these OFDM symbols can contain a CP (Concurrent Protocol Component). In this way, the LP-SS occupying multiple OFDM symbols helps improve synchronization accuracy and channel estimation accuracy. Furthermore, the inclusion of a CP in each of these OFDM symbols helps reduce inter-symbol interference and inter-carrier interference.

[0098] The method embodiments of this application will be described below.

[0099] Figure 3 is a schematic flowchart of a wireless communication method provided in an embodiment of this application. The method shown in Figure 3 is described from the perspective of interaction between a terminal device and a network device, which can be, for example, the terminal device 120 and the network device 110 shown in Figure 1. The method shown in Figure 3 may include step S310, which will be described below.

[0100] In step S310, the network device sends an LP-SS to the terminal device. Correspondingly, the terminal device receives (or detects) the LP-SS sent by the network device.

[0101] In some embodiments, LP-SS can be used for synchronization and / or RRM of the terminal device, or in other words, LP-SS can be used for synchronization and / or measurement (such as RRM measurement) of the terminal device. For example, LP-SS can be used for synchronization and / or RRM of the WUR in the terminal device. As an example, LP-SS can be used for WUR synchronization. As another example, LP-SS can be used for WUR RRM. As yet another example, LP-SS can be used for both WUR synchronization and RRM.

[0102] It should be noted that the name of LP-SS is not limited in the embodiments of this application, as long as it is used for synchronization and / or RRM in terminal devices (such as WUR in terminal devices). For example, LP-SS can also be understood or replaced as the name of a signal with the same or similar function as LP-SS in future communication systems.

[0103] In some embodiments, LP-SS can be modulated using an OOK method to simplify the LP-SS demodulation process.

[0104] In some embodiments, LP-SS may include an LP-SS sequence. Or, LP-SS can be generated from an LP-SS sequence.

[0105] In some embodiments, the LP-SS sequence can be a binary sequence. That is, the LP-SS can include a binary sequence to simplify the LP-SS demodulation process. The following description uses a binary LP-SS sequence as an example.

[0106] The embodiments of this application do not limit the type or number of binary sequences for LP-SS. As an example, the number of binary sequences for LP-SS can be 4. As another example, the number of binary sequences for LP-SS can be 6. As an example, the type of binary sequence for LP-SS can include an OOK-modulated LP-SS sequence. As another example, the type of binary sequence for LP-SS can include an OFDM sequence superimposed on OOK modulation.

[0107] In some embodiments, the design of the LP-SS needs to meet certain performance requirements and / or evaluation assumptions. For a detailed description of the performance requirements and / or evaluation assumptions that the LP-SS needs to meet, please refer to the above text; they will not be repeated here.

[0108] In this embodiment, the LP-SS can occupy multiple OFDM symbols. In some embodiments, the LP-SS occupying multiple OFDM symbols can be understood as the LP-SS having a time-domain resource overhead greater than that of one OFDM symbol. The number of OFDM symbols occupied by the LP-SS is described below using different M values ​​as examples. Here, M indicates the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS.

[0109] Taking M=1 as an example, the length L of the LP-SS can take one of the following values: {4, 6, 8}. In this case, the number of OFDM symbols occupied by the LP-SS is L / M, that is, L / M is the OFDM symbol overhead required by the LP-SS. As an example, when M=1 and L=4, the LP-SS occupies 4 OFDM symbols. As another example, when M=1 and L=6, the LP-SS occupies 6 OFDM symbols. As yet another example, when M=1 and L=8, the LP-SS occupies 8 OFDM symbols. It can be seen that the LP-SS occupies multiple OFDM symbols.

[0110] Taking M=2 as an example, the length L of the LP-SS can take one of the following values: {8, 12, 16, 24}. In this case, the number of OFDM symbols occupied by the LP-SS is L / M, that is, L / M is the OFDM symbol overhead required by the LP-SS. As an example, when M=2 and L=8, the LP-SS occupies 4 OFDM symbols. As another example, when M=2 and L=12, the LP-SS occupies 6 OFDM symbols. As yet another example, when M=2 and L=16, the LP-SS occupies 8 OFDM symbols. As yet another example, when M=2 and L=24, the LP-SS occupies 12 OFDM symbols. It can be seen that the LP-SS occupies multiple OFDM symbols.

[0111] Taking M=4 as an example, the length L of the LP-SS can take one of the following values: {16, 24, 32, 56}. In this case, the number of OFDM symbols occupied by the LP-SS is L / M, that is, L / M is the OFDM symbol overhead required by the LP-SS. As an example, when M=4 and L=16, the LP-SS occupies 4 OFDM symbols. As another example, when M=4 and L=24, the LP-SS occupies 6 OFDM symbols. As yet another example, when M=4 and L=32, the LP-SS occupies 8 OFDM symbols. As yet another example, when M=4 and L=56, the LP-SS occupies 14 OFDM symbols. It can be seen that the LP-SS occupies multiple OFDM symbols.

[0112] In some embodiments, to reduce inter-symbol interference and inter-carrier interference caused by multipath propagation, each OFDM symbol among the multiple OFDM symbols occupied by the LP-SS may include a CP. That is, to reduce inter-symbol interference and inter-carrier interference caused by multipath propagation, a CP can be appended before each OFDM symbol among the multiple OFDM symbols occupied by the LP-SS. In other words, in the embodiments of this application, the LP-SS may include multiple CPs.

[0113] As one possible implementation, before sending the LP-SS, the network device can append a CP to each OFDM symbol among the multiple OFDM symbols occupied by the binary sequence of the LP-SS to generate the LP-SS to be sent. Taking the length of the binary sequence of the LP-SS as L and the number of OOK symbols transmitted on each OFDM as M as an example, the LP-SS needs to be transmitted on L / M OFDM symbols, and each of these L / M OFDM symbols needs to have a CP appended.

[0114] In some embodiments, a network device may copy the sampling points (i.e. signals) at the end (or tail) of an OFDM symbol to the beginning (or front) of that OFDM symbol to form a CP.

[0115] To facilitate understanding, examples of adding a CP in LP-SS are given below with reference to Figures 4A and 4B. Figure 4A is an example diagram of added CP corresponding to the OOK-1 modulation scheme. As shown in Figure 4A, one OOK symbol is transmitted in one OFDM symbol, and each OFDM symbol contains a CP. Figure 4B is an example diagram of added CP corresponding to the OOK-4 modulation scheme. As shown in Figure 4B, two OOK symbols can be transmitted in one OFDM symbol, and each OFDM symbol contains a CP.

[0116] In some embodiments, if the LP-SS contains multiple CPs, the CPs can affect the terminal device's performance of LP-SS correlation detection when performing such detection. For example, the more OOK symbols transmitted within an OFDM symbol (i.e., the larger M is), the closer the lengths of the CPs and OOK symbols become, resulting in a greater impact of the CPs on the LP-SS waveform. Since the terminal device needs to perform correlation processing on the entire sequence when performing LP-SS correlation detection, the impact of the CPs on the LP-SS waveform may cause synchronization failure.

[0117] Therefore, this application's embodiments consider the impact of CP on the LP-SS when designing it. The following describes how this application designs the LP-SS after considering the impact of CP, using Embodiment 1 and Embodiment 2 as examples. Embodiment 1 aims to ensure superior LP-SS performance, so that even if the LP-SS is affected by CP, it still meets performance requirements. Embodiment 2 aims to eliminate the impact of CP on correlation detection before the terminal device performs correlation detection between the LP-SS and the local synchronization sequence.

[0118] It should be noted that Embodiment 1 and Embodiment 2 can be used individually or in combination. For example, the embodiments of this application can use the LP-SS provided in Embodiment 1, and after receiving the LP-SS, the terminal device can process the LP-SS or the local synchronization sequence based on Embodiment 2.

[0119] Example 1:

[0120] When the design of LP-SS takes into account the impact of CP, the correlation of the binary sequence of LP-SS itself will be lost. Therefore, Example 1 aims to design a binary sequence of LP-SS that is less affected by CP and meets the synchronization performance requirements.

[0121] In some embodiments, LP-SS comprises a binary sequence with a uniform distribution of OOK symbols, meaning that the OOK symbols in the binary sequence of LP-SS are uniformly distributed. That is, for a binary sequence of LP-SS, the number of 0s and 1s (or, on and off) in the OOK symbols is the same. A binary sequence with a uniform distribution of OOK symbols is beneficial for improving the performance of correlation detection.

[0122] As an example, assuming the length of the binary sequence of LP-SS is 4, the binary sequence can include 2 1s (or on) and 2 0s (or off).

[0123] As another example, assuming the length of the binary sequence of LP-SS is 6, the binary sequence can include 3 1s (or on) and 3 0s (or off).

[0124] As another example, assuming the length of the binary sequence of LP-SS is 8, the binary sequence can include 4 1s (or on) and 4 0s (or off).

[0125] As another example, assuming the length of the binary sequence of LP-SS is 16, the binary sequence can include 8 ones (or on) and 8 zeros (or off).

[0126] For ease of understanding, the following section uses different binary sequence lengths as examples to introduce the binary sequence of LP-SS provided in the embodiments of this application.

[0127] Example 1.1: The length of the binary sequence of LP-SS is 4 (i.e., L = 4).

[0128] For L=4, considering the uniform distribution of OOK symbols in the binary sequence, there are a total of 6 sequences. This application embodiment evaluates the performance of these 6 sequences, and the evaluation results are shown in Figure 5 and Table 1. It can be seen that, according to the performance evaluation results, all 6 sequences meet the performance requirements of LP-SS.

[0129] Table 1

[0130] Therefore, in some embodiments, the binary sequence of LP-SS can be selected from multiple sequences (or, sequence sets, sequence groups, etc.).

[0131] In some embodiments, the plurality of sequences may include one or more of the following: sequence 0011, sequence 0101, sequence 0110, sequence 1001, sequence 1010, and sequence 1100.

[0132] In some embodiments, the plurality of sequences may include one of the sequences described above. In this case, the plurality of sequences may also include other sequences besides those listed. As an example, the plurality of sequences may include sequence 0011. As another example, the plurality of sequences may include sequence 0101. As yet another example, the plurality of sequences may include sequence 0110. As yet another example, the plurality of sequences may include sequence 1001. As yet another example, the plurality of sequences may include sequence 1010. As yet another example, the plurality of sequences may include sequence 1100.

[0133] In some embodiments, the plurality of sequences may include a variety of the sequences described above.

[0134] As an example, the multiple sequences may include sequence 0011 and sequence 0101.

[0135] As another example, the plurality of sequences may include sequence 0011 and sequence 0110.

[0136] As yet another example, the multiple sequences could include sequence 0101 and sequence 1001.

[0137] As yet another example, the plurality of sequences may include sequence 1001, sequence 0101, and sequence 0011.

[0138] As yet another example, the plurality of sequences may include sequence 1001, sequence 0101, and sequence 0110.

[0139] As yet another example, the plurality of sequences may include sequence 0011, sequence 0101, sequence 0110, and sequence 1001.

[0140] As yet another example, the plurality of sequences may include sequence 0011, sequence 0101, sequence 1001, and sequence 1010.

[0141] As yet another example, the plurality of sequences may include sequence 0011, sequence 0101, sequence 0110, sequence 1001, and sequence 1010.

[0142] As yet another example, the plurality of sequences may include sequence 0011, sequence 0101, sequence 0110, sequence 1001, and sequence 1100.

[0143] As yet another example, the plurality of sequences may include sequence 0011, sequence 0101, sequence 0110, sequence 1001, sequence 1010, and sequence 1100.

[0144] It should be noted that the above examples are merely illustrations, and the multiple sequences can be any combination of one or more of the above sequences. For the sake of brevity, other combinations will not be listed.

[0145] In some embodiments, the plurality of sequences may be selected from the sequences listed above based on one or more of the following: maximum cross-correlation, maximum autocorrelation, and synchronization performance.

[0146] Taking a sequence consisting of two sequences as an example, the two sequences can be selected based on synchronization performance. For instance, the two sequences could include sequence 1001 and sequence 0101.

[0147] Taking a sequence comprising four sequences as an example, these four sequences can be selected based on synchronization performance. For instance, the four sequences may include sequence 0011, sequence 0101, sequence 0110, and sequence 1001. That is, in some embodiments, the LP-SS may be selected from the following sequences: sequence 0011, sequence 0101, sequence 0110, and sequence 1001.

[0148] Taking a sequence comprising four sequences as an example, these four sequences can be selected based on maximum cross-correlation, maximum autocorrelation, and synchronization performance. Since the maximum cross-correlation / maximum autocorrelation of any four sequences out of the above six sequences is 1, the four sequences selected based on synchronization performance can include sequence 0011, sequence 0101, sequence 0110, and sequence 1001.

[0149] In some embodiments, Example 1.1 can be applied to a scenario where M=1. That is, in Example 1.1, the number of OOK symbols transmitted within one OFDM symbol corresponding to LP-SS is 1.

[0150] Example 1.2: The length of the binary sequence of LP-SS is 6 (i.e., L = 6).

[0151] For L=6, considering the uniform distribution of OOK symbols in the binary sequence, there are a total of 20 sequences, as shown in Table 2.

[0152] Table 2

[0153] This application embodiment evaluates the performance of these 20 sequences, and the evaluation results are shown in Figure 6 and Table 3 (Table 3 shows the 6 sequences with the best synchronization performance). It can be seen that, according to the performance evaluation results, all 6 sequences shown in Table 3 meet the performance requirements of LP-SS.

[0154] Table 3

[0155] Therefore, in some embodiments, the binary sequence of LP-SS can be selected from multiple sequences (or, sequence sets, sequence groups, etc.).

[0156] In some embodiments, the plurality of sequences may include one or more of the following: sequence 100101, sequence 101001, sequence 100011, sequence 110001, sequence 010101, and sequence 010011.

[0157] In some embodiments, the plurality of sequences may include one of the sequences described above. In this case, the plurality of sequences may also include other sequences besides those listed. As an example, the plurality of sequences may include sequence 100101. As another example, the plurality of sequences may include sequence 101001. As yet another example, the plurality of sequences may include sequence 100011. As yet another example, the plurality of sequences may include sequence 110001. As yet another example, the plurality of sequences may include sequence 010101. As yet another example, the plurality of sequences may include sequence 010011.

[0158] In some embodiments, the plurality of sequences may include a variety of the sequences described above.

[0159] As an example, the multiple sequences could include sequence 100101 and sequence 101001.

[0160] As another example, the multiple sequences may include sequence 100101 and sequence 100011.

[0161] As yet another example, the plurality of sequences may include sequence 101001 and sequence 100011.

[0162] As yet another example, the multiple sequences may include sequence 100101, sequence 101001, and sequence 100011.

[0163] As yet another example, the plurality of sequences may include sequence 100101, sequence 101001, and sequence 110001.

[0164] As yet another example, the plurality of sequences may include sequence 100101, sequence 101001, sequence 100011, and sequence 110001.

[0165] As yet another example, the plurality of sequences may include sequence 100101, sequence 101001, sequence 100011, and sequence 010101.

[0166] As yet another example, the plurality of sequences may include sequence 100101, sequence 101001, sequence 100011, sequence 110001, and sequence 010101.

[0167] As yet another example, the plurality of sequences may include sequence 100101, sequence 101001, sequence 100011, sequence 110001, and sequence 010011.

[0168] As yet another example, the plurality of sequences may include sequence 100101, sequence 101001, sequence 100011, sequence 110001, sequence 010101, and sequence 010011.

[0169] It should be noted that the above examples are merely illustrations, and the multiple sequences can be any combination of one or more of the above sequences. For the sake of brevity, other combinations will not be listed.

[0170] In some embodiments, the plurality of sequences may be selected from the sequences listed above based on one or more of the following: maximum cross-correlation, maximum autocorrelation, and synchronization performance.

[0171] Taking a sequence consisting of two sequences as an example, the two sequences can be selected based on synchronization performance. For instance, the two sequences could include sequence 100101 and sequence 101001.

[0172] Taking a sequence comprising four sequences as an example, these four sequences can be selected based on synchronization performance. For instance, the four sequences could include sequence 100101, sequence 101001, sequence 100011, and sequence 110001. That is, in some embodiments, the LP-SS can be selected from the following sequences: sequence 100101, sequence 101001, sequence 100011, and sequence 110001.

[0173] Taking a sequence comprising four sequences as an example, these four sequences can be selected based on maximum cross-correlation, maximum autocorrelation, and synchronization performance. Since the maximum cross-correlation / maximum autocorrelation ratio of any four sequences out of the above six sequences is 0.6667, the four sequences selected based on synchronization performance can include sequences 100101, 101001, 100011, and 110001.

[0174] In some embodiments, Example 1.2 can be applied to a scenario where M=1. That is, in Example 1.2, the number of OOK symbols transmitted within one OFDM symbol corresponding to LP-SS is 1.

[0175] Example 1.3: The length of the binary sequence of LP-SS is 8 (i.e., L = 8).

[0176] For L=8, considering the uniform distribution of OOK symbols in the binary sequence, there are a total of 70 sequences, as shown in Table 4.

[0177] Table 4

[0178] This application embodiment evaluates the performance of these 70 sequences, and the evaluation results are shown in Figures 7A and 7B, and Table 5 (Table 5 shows the 10 sequences with the best synchronization performance). It can be seen that, according to the performance evaluation results, the 10 sequences shown in Table 5 all meet the performance requirements of LP-SS.

[0179] Table 5

[0180] Therefore, in some embodiments, the binary sequence of LP-SS can be selected from multiple sequences (or, sequence sets, sequence groups, etc.).

[0181] In some embodiments, the plurality of sequences may include one or more of the following: sequence 10100101, sequence 10010101, sequence 10001011, sequence 10001101, sequence 10110001, sequence 10011001, sequence 10010011, sequence 10101001, sequence 11000101, and sequence 11001001.

[0182] In some embodiments, the plurality of sequences may include one of the sequences described above. In this case, the plurality of sequences may also include other sequences besides those listed. As an example, the plurality of sequences may include sequence 10100101. As another example, the plurality of sequences may include sequence 10010101. As yet another example, the plurality of sequences may include sequence 10001011. As yet another example, the plurality of sequences may include sequence 10001101. As yet another example, the plurality of sequences may include sequence 10110001. As yet another example, the plurality of sequences may include sequence 10010011. As yet another example, the plurality of sequences may include sequence 10101001. As yet another example, the plurality of sequences may include sequence 11000101. As yet another example, the plurality of sequences may include sequence 11001001.

[0183] In some embodiments, the plurality of sequences may include a variety of the sequences described above.

[0184] As an example, the multiple sequences could include sequence 10100101 and sequence 10010101.

[0185] As another example, the plurality of sequences may include sequence 10100101 and sequence 10001011.

[0186] As yet another example, the plurality of sequences may include sequence 10010101 and sequence 10001011.

[0187] As yet another example, the plurality of sequences may include sequence 10100101, sequence 10010101, and sequence 10001011.

[0188] As yet another example, the plurality of sequences may include sequence 10100101, sequence 10010101, and sequence 10001101.

[0189] As yet another example, the plurality of sequences may include sequence 10100101, sequence 10010101, sequence 10001011, and sequence 10001101.

[0190] As yet another example, the plurality of sequences may include sequence 10100101, sequence 10010101, sequence 10001011, and sequence 10110001.

[0191] As yet another example, the plurality of sequences may include sequence 10100101, sequence 10010101, sequence 10001011, sequence 10001101, and sequence 10110001.

[0192] As yet another example, the plurality of sequences may include sequence 10100101, sequence 10010101, sequence 10001011, sequence 10001101, and sequence 10011001.

[0193] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, and 10011001.

[0194] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, and 10010011.

[0195] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, 10011001, and 10010011.

[0196] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, 10011001, and 10101001.

[0197] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, 10011001, 10010011, and 10101001.

[0198] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, 10011001, 10010011, and 11000101.

[0199] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, 10011001, 10010011, 10101001, and 11000101.

[0200] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, 10011001, 10010011, 10101001, and 11001001.

[0201] As yet another example, the plurality of sequences may include the sequences 10100101, 10010101, 10001011, 10001101, 10110001, 10011001, 10010011, 10101001, 11000101, and 11001001.

[0202] It should be noted that the above examples are merely illustrations, and the multiple sequences can be any combination of one or more of the above sequences. For the sake of brevity, other combinations will not be listed.

[0203] In some embodiments, the plurality of sequences may be selected from the sequences listed above based on one or more of the following: maximum cross-correlation, maximum autocorrelation, and synchronization performance.

[0204] Taking a sequence consisting of two sequences as an example, the two sequences can be selected based on synchronization performance. For instance, the two sequences could include sequence 10100101 and sequence 10010101.

[0205] Taking a sequence comprising four sequences as an example, these four sequences can be selected based on synchronization performance. For instance, the four sequences could include sequence 10100101, sequence 10010101, sequence 10001011, and sequence 10001101. That is, in some embodiments, the LP-SS can be selected from the following sequences: sequence 10100101, sequence 10010101, sequence 10001011, and sequence 10001101.

[0206] Taking a sequence comprising four sequences as an example, these four sequences can be selected based on maximum cross-correlation, maximum autocorrelation, and synchronization performance. Since the maximum cross-correlation / maximum autocorrelation ratio of any four sequences out of the six sequences mentioned above is 0.75, the four sequences selected based on synchronization performance can include sequences 10100101, 10010101, 10001011, and 10001101.

[0207] In some embodiments, Example 1.3 can be applied to scenarios where M=1 or M=2. That is, in Example 1.3, the number of OOK symbols transmitted within one OFDM symbol corresponding to LP-SS is 1 or 2.

[0208] Example 1.4: M is greater than or equal to 2

[0209] In some embodiments, if M is greater than or equal to 2, that is, the number of OOK symbols transmitted within an OFDM symbol corresponding to LP-SS is greater than or equal to 2, then the binary sequence of LP-SS can be obtained based on the first sequence.

[0210] In some embodiments, the first sequence is a binary sequence in which OOK symbols are evenly distributed.

[0211] In some embodiments, the number of OOK symbols transmitted within an OFDM symbol corresponding to the first sequence is 1.

[0212] In some embodiments, the first sequence may include any binary sequence described in Embodiments 1.1 to 1.3. As an example, the first sequence may be any of the six binary sequences described in Embodiment 1.1. As another example, the first sequence may be any of the four binary sequences with the best synchronization performance described in Embodiment 1.1, i.e., the first sequence is any of sequence 0011, sequence 0101, sequence 0110, and sequence 1001. As yet another example, the first sequence may be any of the six binary sequences described in Embodiment 1.2. As yet another example, the first sequence may be any of the four binary sequences with the best synchronization performance described in Embodiment 1.2, i.e., the first sequence is any of sequence 100101, sequence 101001, sequence 100011, and sequence 110001. As yet another example, the first sequence may be any of the ten binary sequences described in Embodiment 1.3. As another example, the first sequence can be any one of the four binary sequences with the best synchronization performance introduced in Example 1.3, that is, the first sequence is any one of the sequences 10100101, 10010101, 10001011, and 10001101.

[0213] In some embodiments, the binary sequence of LP-SS is obtained based on the first sequence, which can be understood or replaced by the binary sequence of LP-SS being obtained by extending the first sequence.

[0214] This application does not limit the implementation method of obtaining the binary sequence of LP-SS based on the first sequence. Exemplarily, the binary sequence of LP-SS can be obtained by repetition and / or reversal of the first sequence. Reversing the first sequence means reversing (or inverting, logically negating) the OOK symbols in the first sequence. As an example, if a certain OOK symbol in the first sequence is 0, reversing it means reversing that OOK symbol to 1. As another example, if a certain OOK symbol in the first sequence is 1, reversing it means reversing that OOK symbol to 0.

[0215] For example, the binary sequence of LP-SS can be obtained by repeating the first sequence.

[0216] Taking an LP-SS with M=2 and L=16 as an example, the binary sequence of this LP-SS can be obtained by repeating the first sequence with M=1 (or M=2) and L=8. Assuming the first sequence is 10100101, then the binary sequence of the LP-SS with M=2 and L=16 obtained by repeating the first sequence is 1010010110100101.

[0217] Taking the LP-SS with M=2 and L=16 as an example, the binary sequence of this LP-SS can be obtained by repeating the first sequence with M=1 and L=4. Assuming the first sequence is 0011, then the binary sequence of the LP-SS with M=2 and L=16 obtained by repeating the first sequence is 0011001100110011.

[0218] For example, the binary sequence of LP-SS can be obtained by repeating and reversing the first sequence.

[0219] Taking an LP-SS with M=2 and L=16 as an example, the binary sequence of this LP-SS can be obtained by repeating and reversing the first sequence with M=1 (or M=2) and L=8. Assuming the first sequence is 10100101, then the reversed sequence of the first sequence is 01011010. The binary sequence of the LP-SS with M=2 and L=16 obtained by repeating and reversing the first sequence is either 1010010101011010 or 0101101010100101.

[0220] Taking the LP-SS with M=2 and L=16 as an example, the binary sequence of this LP-SS can be obtained by repeating and reversing the first sequence with M=1 and L=4. Assuming the first sequence is 0011, then the reversed sequence of the first sequence is 1100. The binary sequence of the LP-SS with M=2 and L=16 obtained by repeating and reversing the first sequence is 0011001111001100 or 0011110000111100 or 001111001100001100 or 1100110000110011 or 1100001111000011 or 11000011001111000011 or 1100001100111100.

[0221] Example 2:

[0222] In actual signal transmission, the CP length contained in each OFDM symbol (or the CP length at the beginning of each OFDM symbol) may vary. Therefore, in order to avoid the influence of CP on correlation detection, when the terminal device performs sequence correlation detection on LP-SS and obtains synchronization information, it can process the received LP-SS or process the local synchronization sequence to eliminate the influence of CP on sequence correlation detection. This will be explained in conjunction with Figure 8 below.

[0223] As shown in Figure 8, the terminal device can receive the LP-SS sent by the network device. This LP-SS contains the CP. Furthermore, the terminal device can construct a local synchronization sequence (or local sequence), and the construction process of this local synchronization sequence is consistent with the process by which the network device constructs the binary sequence of the LP-SS. In other words, this local synchronization sequence is the same as the binary sequence used by the network device to generate the LP-SS.

[0224] In Example 2, the terminal device can process the received LP-SS or the local synchronization sequence to eliminate the influence of CP on sequence correlation detection.

[0225] Referring to the method shown in Figure 8 (1), as a possible implementation, the terminal device can remove the CP contained in the received LP-SS and perform correlation detection on the sequence obtained after removing the CP and the local synchronization sequence. That is, the terminal device can remove the CP contained in the received LP-SS, concatenate the signal parts after removing the CP, and perform correlation detection on the concatenated sequence and the local synchronization sequence. Removing the CP contained in the received LP-SS helps to eliminate the influence of CP on sequence correlation detection.

[0226] In some embodiments, the removal of the CP contained in the received LP-SS by the terminal device can also be referred to as, or understood as, the terminal device performing a punching process on the CP contained in the received LP-SS.

[0227] In some embodiments, the length of the CP removed by the terminal device is determined based on the index of the OFDM symbol occupied by the LP-SS. Alternatively, the terminal device can determine the length of the CP based on the index of the OFDM symbol in order to remove the CP contained in the received LP-SS.

[0228] Referring to method (2) shown in Figure 8, as another possible implementation, the terminal device can pad the beginning of each OFDM symbol in the multiple OFDM symbols corresponding to the local synchronization sequence with bits, and perform correlation detection on the received LP-SS and the sequence obtained after padding. That is, the terminal device can pad the local synchronization sequence with bits to make the CP length in the local synchronization sequence consistent with the CP length contained in the received LP-SS, thereby helping to eliminate the influence of CP on sequence correlation detection.

[0229] In some embodiments, the terminal device fills the beginning of each OFDM symbol corresponding to the local synchronization sequence with bits of 0. That is, the terminal device can fill the local synchronization sequence with 0 (as CP) to obtain a filled sequence containing 0 elements, and perform correlation detection based on the filled sequence containing 0 elements. In other words, the terminal device can fill the local synchronization sequence with 0 elements, where the filling position is the position of the CP in the LP-SS. This application embodiment uses 0 elements to fill the local synchronization sequence, which is simple to implement and has little impact on correlation detection. However, this application embodiment is not limited to this; for example, this application embodiment can use 1 elements for filling.

[0230] In some embodiments, the bits padded at the beginning of each OFDM symbol corresponding to the local synchronization sequence by the terminal device are the sampling points (signals or OOK symbols) at the end of each OFDM symbol. In other words, the terminal device can padded the local synchronization sequence according to the current CP padding rule (i.e., within each OFDM symbol, copying the corresponding sampling points from the end of the OFDM symbol and placing them at the beginning of the OFDM symbol). Taking a local synchronization sequence corresponding to 4 OFDM symbols as an example, the terminal device can padded the sampling points at the beginning of the first OFDM symbol to the end of the first OFDM symbol, the beginning of the second OFDM symbol to the end of the second OFDM symbol, the beginning of the third OFDM symbol to the end of the third OFDM symbol, and the beginning of the fourth OFDM symbol to the end of the fourth OFDM symbol. The terminal device padding the local synchronization sequence according to the current CP padding rule more closely resembles the actual LP-SS signal transmission process, which is beneficial for improving the performance of correlation detection.

[0231] In some embodiments, the length of the bits padded by the terminal device is determined based on the index of the OFDM symbol occupied by the LP-SS. Alternatively, the terminal device can determine the length of the CP based on the index of the OFDM symbol, so as to padded bits in the local synchronization sequence according to the determined CP length.

[0232] It should be noted that the embodiments of this application do not limit the implementation method of the terminal device determining the length of the CP based on the index of the OFDM symbol. For details on the implementation method of the terminal device determining the length of the CP based on the index of the OFDM symbol, please refer to related technologies, which will not be elaborated here.

[0233] It should be noted that the correlation detection (or sequence correlation detection) mentioned in the embodiments of this application is for obtaining synchronization information. For an introduction to the correlation detection of sequences by terminal devices, please refer to related technologies, which will not be detailed here.

[0234] The method embodiments of this application have been described in detail above with reference to Figures 1 to 8. The apparatus embodiments of this application will be described in detail below with reference to Figures 9 to 11. It should be understood that the descriptions of the method embodiments correspond to the descriptions of the apparatus embodiments; therefore, any parts not described in detail can be referred to the foregoing method embodiments.

[0235] Figure 9 is a schematic diagram of the structure of a terminal device provided in an embodiment of this application. The terminal device 900 shown in Figure 9 includes a receiving module 910. The receiving module 910 can be used to receive LP-SS sent by a network device, wherein the LP-SS occupies multiple OFDM symbols, and each OFDM symbol in the multiple OFDM symbols contains a CP.

[0236] In some embodiments, the LP-SS comprises a binary sequence with a uniform distribution of OOK symbols.

[0237] In some embodiments, the binary sequence of the LP-SS is selected from a plurality of sequences, including one or more of the following: sequence 0011; sequence 0101; sequence 0110; sequence 1001; sequence 1010; sequence 1100.

[0238] In some embodiments, the plurality of sequences include: sequence 0011; sequence 0101; sequence 0110; and sequence 1001.

[0239] In some embodiments, the length of the binary sequence is 4, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

[0240] In some embodiments, the binary sequence of the LP-SS is selected from a plurality of sequences, including one or more of the following: sequence 100101; sequence 101001; sequence 100011; sequence 110001; sequence 010101; sequence 010011.

[0241] In some embodiments, the plurality of sequences include: sequence 100101; sequence 101001; sequence 100011; and sequence 110001.

[0242] In some embodiments, the length of the binary sequence is 6, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

[0243] In some embodiments, the binary sequence of the LP-SS is selected from a plurality of sequences, including one or more of the following: sequence 10100101; sequence 10010101; sequence 10001011; sequence 10001101; sequence 10110001; sequence 10011001; sequence 10010011; sequence 10101001; sequence 11000101; sequence 11001001.

[0244] In some embodiments, the plurality of sequences include: sequence 10100101; sequence 10010101; sequence 10001011; sequence 10001101.

[0245] In some embodiments, the length of the binary sequence is 8, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1 or 2.

[0246] In some embodiments, if the number of OOK symbols transmitted within an OFDM symbol corresponding to the LP-SS is greater than or equal to 2, then the binary sequence of the LP-SS is obtained based on a first sequence, which is a binary sequence in which OOK symbols are uniformly distributed, and the number of OOK symbols transmitted within an OFDM symbol corresponding to the first sequence is 1.

[0247] In some embodiments, the binary sequence of the LP-SS is obtained based on a first sequence, including: the binary sequence of the LP-SS is obtained by repeating and / or reversing the first sequence.

[0248] In some embodiments, the terminal device further includes a processing module 920, which is configured to: remove the CP contained in the LP-SS and perform correlation detection on the sequence obtained after removing the CP and the local synchronization sequence of the terminal device; or pad the beginning of each OFDM symbol in the plurality of OFDM symbols corresponding to the local synchronization sequence with bits and perform correlation detection on the LP-SS and the sequence obtained after padding the bits.

[0249] In some embodiments, the terminal device fills the beginning of each OFDM symbol corresponding to the local synchronization sequence with 0 elements.

[0250] In some embodiments, the bits padded at the beginning of each OFDM symbol corresponding to the local synchronization sequence by the terminal device are the sampling points at the end of each OFDM symbol.

[0251] In some embodiments, the length of the CP removed by the terminal device is determined based on the index of the OFDM symbol occupied by the LP-SS, or the length of the bits filled by the terminal device is determined based on the index of the OFDM symbol occupied by the LP-SS.

[0252] In some embodiments, the receiving module 910 may be a transceiver 1130. The terminal device 900 may also include a processor 1110 and a memory 1120, as shown in FIG11.

[0253] Figure 10 is a schematic diagram of the structure of a network device provided in an embodiment of this application. The network device 1000 shown in Figure 10 includes a transmitting module 1010. The transmitting module 1010 can be used to transmit LP-SS to a terminal device, wherein the LP-SS occupies multiple OFDM symbols, and each OFDM symbol in the multiple OFDM symbols contains a CP.

[0254] In some embodiments, the LP-SS comprises a binary sequence with a uniform distribution of OOK symbols.

[0255] In some embodiments, the binary sequence of the LP-SS is selected from a plurality of sequences, including one or more of the following: sequence 0011; sequence 0101; sequence 0110; sequence 1001; sequence 1010; sequence 1100.

[0256] In some embodiments, the plurality of sequences include: sequence 0011; sequence 0101; sequence 0110; and sequence 1001.

[0257] In some embodiments, the length of the binary sequence is 4, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

[0258] In some embodiments, the binary sequence of the LP-SS is selected from a plurality of sequences, including one or more of the following: sequence 100101; sequence 101001; sequence 100011; sequence 110001; sequence 010101; sequence 010011.

[0259] In some embodiments, the plurality of sequences include: sequence 100101; sequence 101001; sequence 100011; and sequence 110001.

[0260] In some embodiments, the length of the binary sequence is 6, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

[0261] In some embodiments, the binary sequence of the LP-SS is selected from a plurality of sequences, including one or more of the following: sequence 10100101; sequence 10010101; sequence 10001011; sequence 10001101; sequence 10110001; sequence 10011001; sequence 10010011; sequence 10101001; sequence 11000101; sequence 11001001.

[0262] In some embodiments, the plurality of sequences include: sequence 10100101; sequence 10010101; sequence 10001011; sequence 10001101.

[0263] In some embodiments, the length of the binary sequence is 8, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1 or 2.

[0264] In some embodiments, if the number of OOK symbols transmitted within an OFDM symbol corresponding to the LP-SS is greater than or equal to 2, then the binary sequence of the LP-SS is obtained based on a first sequence, which is a binary sequence in which OOK symbols are uniformly distributed, and the number of OOK symbols transmitted within an OFDM symbol corresponding to the first sequence is 1.

[0265] In some embodiments, the binary sequence of the LP-SS is obtained based on a first sequence, including: the binary sequence of the LP-SS is obtained by repeating and / or reversing the first sequence.

[0266] In some embodiments, the transmitting module 1010 may be a transceiver 1130. The network device 1000 may also include a processor 1110 and a memory 1120, as shown in FIG11.

[0267] Figure 11 is a schematic structural diagram of a communication device according to an embodiment of this application. The dashed lines in Figure 11 indicate that the unit or module is optional. This device 1100 can be used to implement the methods described in the above method embodiments. Device 1100 can be a chip, a terminal device, or a network device.

[0268] Apparatus 1100 may include one or more processors 1110. The processor 1110 may support apparatus 1100 in implementing the methods described in the preceding method embodiments. The processor 1110 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0269] The apparatus 1100 may further include one or more memories 1120. The memories 1120 store a program that can be executed by the processor 1110, causing the processor 1110 to perform the methods described in the preceding method embodiments. The memories 1120 may be independent of the processor 1110 or integrated within the processor 1110.

[0270] The device 1100 may also include a transceiver 1130. The processor 1110 can communicate with other devices or chips via the transceiver 1130. For example, the processor 1110 can send and receive data with other devices or chips via the transceiver 1130.

[0271] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal device or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

[0272] This application also provides a computer program product. The computer program product includes a program. This computer program product can be applied to a terminal device or network device provided in the embodiments of this application, and the program causes a computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

[0273] This application also provides a computer program. This computer program can be applied to the terminal device or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal device or network device in various embodiments of this application.

[0274] It should be understood that the terms "system" and "network" in this application can be used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0275] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0276] In the embodiments of this application, "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0277] In the embodiments of this application, the term "correspondence" can indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0278] In the embodiments of this application, the term "comprising" can refer to direct inclusion or indirect inclusion. Optionally, "comprising" in the embodiments of this application can be replaced with "instructing" or "used to determine". For example, "A includes B" can be replaced with "A instructs B" or "A is used to determine B".

[0279] In this application embodiment, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0280] In this application embodiment, the "protocol" may refer to a standard protocol in the field of communication, such as the LTE protocol, the NR protocol, and related protocols applied to future communication systems. This application does not limit this.

[0281] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0282] In the various embodiments of this application, the order of the above-mentioned processes does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0283] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0284] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0285] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0286] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can read or a data storage device such as a server or data center that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs) or semiconductor media (e.g., solid-state disks, SSDs), etc.

[0287] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method of wireless communication, comprising: include: The terminal device receives a low-power synchronization signal LP-SS sent by the network device. The LP-SS occupies multiple orthogonal frequency division multiplexing (OFDM) symbols, and each OFDM symbol contains a cyclic prefix (CP).

2. The method of claim 1, wherein, The LP-SS comprises a binary sequence of on / off key OOK symbols evenly distributed.

3. The method according to claim 1 or 2, characterized in that, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001; Sequence 1010; Sequence 1100.

4. The method of claim 3, wherein, The plurality of sequences includes: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001.

5. The method according to claim 3 or 4, characterized in that, The length of the binary sequence is 4, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

6. The method of claim 1 or 2, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001; Sequence 010101; Sequence 010011.

7. The method of claim 6, wherein, The plurality of sequences includes: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001.

8. The method according to claim 6 or 7, characterized in that, The length of the binary sequence is 6, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

9. The method of claim 1 or 2, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101; Sequence 10110001; Sequence 10011001; Sequence 10010011; Sequence 10101001; Sequence 11000101; Sequence 11001001.

10. The method of claim 9, wherein, The plurality of sequences includes: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101.

11. The method according to claim 9 or 10, characterized in that, The length of the binary sequence is 8, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1 or 2.

12. The method according to any one of claims 1-11, characterized in that, If the number of OOK symbols transmitted within an OFDM symbol corresponding to the LP-SS is greater than or equal to 2, then the binary sequence of the LP-SS is obtained based on a first sequence, which is a binary sequence in which OOK symbols are evenly distributed, and the number of OOK symbols transmitted within an OFDM symbol corresponding to the first sequence is 1.

13. The method of claim 12, wherein, The binary sequence of the LP-SS is obtained based on the first sequence and includes: The binary sequence of the LP-SS is obtained by repeating and / or reversing the first sequence.

14. The method of any one of claims 1-13, wherein, The method further includes: The terminal device removes the CP contained in the LP-SS and performs correlation detection between the sequence obtained after CP removal and the local synchronization sequence of the terminal device; or The terminal device pads the beginning of each OFDM symbol in the multiple OFDM symbols corresponding to the local synchronization sequence with bits, and performs correlation detection on the LP-SS and the sequence obtained after padding the bits.

15. The method of claim 14, wherein, The terminal device fills the beginning of each OFDM symbol corresponding to the local synchronization sequence with 0 elements.

16. The method of claim 14, wherein, The terminal device fills the beginning of each OFDM symbol corresponding to the local synchronization sequence with bits that are the sampling points at the end of each OFDM symbol.

17. The method according to any one of claims 14-16, characterized by, The length of the CP removed by the terminal device is determined according to the index of the OFDM symbol occupied by the LP-SS, or the length of the bits filled by the terminal device is determined according to the index of the OFDM symbol occupied by the LP-SS.

18. A method of wireless communication, comprising: include: The network device sends a low-power synchronization signal LP-SS to the terminal device. The LP-SS occupies multiple orthogonal frequency division multiplexing (OFDM) symbols, and each of the multiple OFDM symbols contains a cyclic prefix (CP).

19. The method of claim 18, wherein, The LP-SS comprises a binary sequence of on / off key OOK symbols evenly distributed.

20. The method of claim 18 or 19, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001; Sequence 1010; Sequence 1100.

21. The method of claim 20, wherein, The plurality of sequences includes: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001.

22. The method of claim 20 or 21, wherein, The length of the binary sequence is 4, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

23. The method of claim 18 or 19, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001; Sequence 010101; Sequence 010011.

24. The method of claim 23, wherein, The plurality of sequences includes: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001.

25. The method of claim 23 or 24, wherein, The length of the binary sequence is 6, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

26. The method of claim 18 or 19, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101; Sequence 10110001; Sequence 10011001; Sequence 10010011; Sequence 10101001; Sequence 11000101; Sequence 11001001.

27. The method of claim 26, wherein, The plurality of sequences includes: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101.

28. The method of claim 26 or 27, wherein, The length of the binary sequence is 8, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1 or 2.

29. The method of any one of claims 18-28, wherein, If the number of OOK symbols transmitted within an OFDM symbol corresponding to the LP-SS is greater than or equal to 2, then the binary sequence of the LP-SS is obtained based on a first sequence, which is a binary sequence in which OOK symbols are evenly distributed, and the number of OOK symbols transmitted within an OFDM symbol corresponding to the first sequence is 1.

30. The method of claim 29, wherein, The binary sequence of the LP-SS is obtained based on the first sequence and includes: The binary sequence of the LP-SS is obtained by repeating and / or reversing the first sequence.

31. A terminal device, comprising: include: The receiving module is used to receive a low-power synchronization signal LP-SS sent by a network device. The LP-SS occupies multiple orthogonal frequency division multiplexing (OFDM) symbols, and each OFDM symbol contains a cyclic prefix (CP).

32. The terminal device of claim 31, wherein, The LP-SS comprises a binary sequence of on / off key OOK symbols evenly distributed.

33. The terminal device of claim 31 or 32, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001; Sequence 1010; Sequence 1100.

34. The terminal device of claim 33, wherein, The plurality of sequences includes: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001.

35. The terminal device of claim 33 or 34, wherein, The length of the binary sequence is 4, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

36. The terminal device of claim 31 or 32, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001; Sequence 010101; Sequence 010011.

37. The terminal device of claim 36, wherein, The plurality of sequences includes: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001.

38. The terminal device of claim 36 or 37, wherein, The length of the binary sequence is 6, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

39. The terminal device of claim 31 or 32, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101; Sequence 10110001; Sequence 10011001; Sequence 10010011; Sequence 10101001; Sequence 11000101; Sequence 11001001.

40. The terminal device of claim 39, wherein, The plurality of sequences includes: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101.

41. The terminal device of claim 39 or 40, wherein, The length of the binary sequence is 8, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1 or 2.

42. The terminal device of any one of claims 31-41, wherein, If the number of OOK symbols transmitted within an OFDM symbol corresponding to the LP-SS is greater than or equal to 2, then the binary sequence of the LP-SS is obtained based on a first sequence, which is a binary sequence in which OOK symbols are evenly distributed, and the number of OOK symbols transmitted within an OFDM symbol corresponding to the first sequence is 1.

43. The terminal device of claim 42, wherein, The binary sequence of the LP-SS is obtained based on the first sequence and includes: The binary sequence of the LP-SS is obtained by repeating and / or reversing the first sequence.

44. The terminal device of any one of claims 31-43, wherein, The terminal device further includes a processing module, which is used for: Remove the CP contained in the LP-SS, and perform correlation detection between the sequence obtained after CP removal and the local synchronization sequence of the terminal device; or The beginning of each OFDM symbol in the plurality of OFDM symbols corresponding to the local synchronization sequence is padded with bits, and the LP-SS and the sequence obtained after the padded bits are correlated and detected.

45. The terminal device of claim 44, wherein, The terminal device fills the beginning of each OFDM symbol corresponding to the local synchronization sequence with 0 elements.

46. The terminal device of claim 44, wherein, The terminal device fills the beginning of each OFDM symbol corresponding to the local synchronization sequence with bits that are the sampling points at the end of each OFDM symbol.

47. The terminal device of any one of claims 44-46, wherein, The length of the CP removed by the terminal device is determined according to the index of the OFDM symbol occupied by the LP-SS, or the length of the bits filled by the terminal device is determined according to the index of the OFDM symbol occupied by the LP-SS.

48. A network device, comprising: include: The transmitting module is used to transmit a low-power synchronization signal LP-SS to the terminal device. The LP-SS occupies multiple orthogonal frequency division multiplexing (OFDM) symbols, and each OFDM symbol contains a cyclic prefix (CP).

49. The network device of claim 48, wherein, The LP-SS comprises a binary sequence of on / off key OOK symbols evenly distributed.

50. The network device of claim 48 or 49, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001; Sequence 1010; Sequence 1100.

51. The network device of claim 50, wherein, The plurality of sequences includes: Sequence 0011; Sequence 0101; Sequence 0110; Sequence 1001.

52. The network device of claim 50 or 51, wherein, The length of the binary sequence is 4, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

53. The network device of claim 48 or 49, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001; Sequence 010101; Sequence 010011.

54. The network device of claim 53, wherein, The plurality of sequences includes: Sequence 100101; Sequence 101001; Sequence 100011; Sequence 110001.

55. The network device of claim 53 or 54, wherein, The length of the binary sequence is 6, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1.

56. The network device of claim 48 or 49, wherein, The binary sequence of the LP-SS is selected from a plurality of sequences, which include one or more of the following: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101; Sequence 10110001; Sequence 10011001; Sequence 10010011; Sequence 10101001; Sequence 11000101; Sequence 11001001.

57. The network device of claim 56, wherein, The plurality of sequences includes: Sequence 10100101; Sequence 10010101; Sequence 10001011; Sequence 10001101.

58. The network device of claim 56 or 57, wherein, The length of the binary sequence is 8, and the number of OOK symbols transmitted within one OFDM symbol corresponding to the LP-SS is 1 or 2.

59. The network device of any of claims 48-58, wherein, If the number of OOK symbols transmitted within an OFDM symbol corresponding to the LP-SS is greater than or equal to 2, then the binary sequence of the LP-SS is obtained based on a first sequence, which is a binary sequence in which OOK symbols are evenly distributed, and the number of OOK symbols transmitted within an OFDM symbol corresponding to the first sequence is 1.

60. The network device of claim 59, wherein, The binary sequence of the LP-SS is obtained based on the first sequence and includes: The binary sequence of the LP-SS is obtained by repeating and / or reversing the first sequence.

61. A terminal device, comprising: The device includes a transceiver, a memory, and a processor. The memory stores a program, and the processor invokes the program in the memory and controls the transceiver to receive or send signals so that the terminal device performs the method as described in any one of claims 1-17.

62. A network device, comprising: The device includes a transceiver, a memory, and a processor. The memory stores a program, and the processor invokes the program in the memory and controls the transceiver to receive or transmit signals so that the network device performs the method as described in any one of claims 18-30.

63. An apparatus, comprising: Includes a processor for calling a program from memory to cause the device to perform the method as described in any one of claims 1-17 or 18-30.

64. A chip, comprising: Includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1-17 or 18-30.

65. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method as described in any one of claims 1-17 or 18-30.

66. A computer program product, characterised in that, Includes a program that causes a computer to perform the method as described in any one of claims 1-17 or 18-30.

67. A computer program characterised in that, The computer program causes the computer to perform the method as described in any one of claims 1-17 or 18-30.

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