Signal synchronization method, terminal, and network-side device

Abstract

The present application relates to the technical field of communications, and discloses a signal synchronization method, a terminal, and a network-side device. The signal synchronization method in the embodiments of the present application comprises: when a first condition is met, a terminal assuming that a first signal is receivable in a first time resource, the first signal being configured for synchronization, and the first condition at least comprising: there being at least one monitoring occasion of a second signal in a group of time resources, the second signal being a signal to be monitored by the terminal; and the first signal corresponding to a monitoring occasion of a specific signal in the group of time resources.

Description

Signal synchronization method, terminal and network side device

[0001] Cross-reference to Related Applications

[0002] This application is based on the Chinese patent application No. 202411374510.5, filed on September 29, 2024, and claims priority to the Chinese patent application No. 202411374510.5, and the entire contents of the Chinese patent application No. 202411374510.5 are hereby incorporated by reference into the present application. TECHNICAL FIELD

[0003] The present application relates to the technical field of communication, in particular to a signal synchronization method, a terminal and a network side device. BACKGROUND

[0004] In related technologies, a periodic synchronization signal (low power synchronization signal, LP-SS) for low power wake up receiver (low power wake up radio, LP-WUR) synchronization is considered. When the LP-SS period is long, due to the residual time-frequency offset after LP-SS synchronization, the accumulated time-frequency offset when receiving a low power wake up signal (low power wake up signal, LP-WUS) is large, which affects the reception performance of the LP-WUS. Therefore, a non-periodic synchronization signal preamble is also considered in related technologies, which is transmitted before each LP-WUS. However, when the LP-WUS is transmitted densely, the overhead of the preamble is large, and the resource utilization efficiency is low. SUMMARY

[0005] Embodiments of the present application provide a signal synchronization method, a terminal and a network side device, which can solve the problems of large overhead and influence on reception performance of LP-WUS caused by transmission of synchronization signal for LP-WUR synchronization in related technologies.

[0006] In a first aspect, a signal synchronization method is provided, which is performed by a terminal, and the method comprises:

[0007] In a case where a first condition is met, the terminal assumes that a first signal can be received in a first time resource, and the first signal is used for synchronization.

[0008] The first condition at least includes at least one listening occasion of a second signal in a group of time resources, and the second signal is a signal that needs to be monitored by the terminal.

[0009] The first signal corresponds to a listening occasion of a specific signal in the group of time resources.

[0010] In a second aspect, a signal synchronization method is provided, performed by a network side device, the method comprising:

[0011] The network side device sends a first signal for synchronization when a first condition is met;

[0012] The first condition comprises at least that there is at least one listening occasion of a second signal that may need to be transmitted in a set of time resources;

[0013] The first signal corresponds to a listening occasion of a specific signal in the set of time resources.

[0014] In a third aspect, a signal synchronization apparatus is provided, comprising:

[0015] A first processing module configured to assume that a first signal for synchronization can be received in a first time resource when a first condition is met;

[0016] The first condition comprises at least that there is at least one listening occasion of a second signal in a set of time resources, the second signal being a signal that the terminal needs to monitor;

[0017] The first signal corresponds to a listening occasion of a specific signal in the set of time resources.

[0018] In a fourth aspect, a signal synchronization apparatus is provided, comprising:

[0019] A first sending module configured to send a first signal for synchronization when a first condition is met;

[0020] The first condition comprises at least that there is at least one listening occasion of a second signal that may need to be transmitted in a set of time resources;

[0021] The first signal corresponds to a listening occasion of a specific signal in the set of time resources.

[0022] In a fifth aspect, a signal synchronization apparatus is provided, configured to perform the steps of the signal synchronization method according to the first aspect, or implement the steps of the signal synchronization method according to the second aspect.

[0023] In a sixth aspect, a terminal is provided, comprising a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions being executed by the processor to implement the steps of the signal synchronization method according to the first aspect.

[0024] In a seventh aspect, a terminal is provided, comprising a processor and a communication interface, wherein the processor is configured to assume that a first signal can be received in a first time resource, the first signal being used for synchronization, if a first condition is met, the first condition at least comprising that there is at least one monitoring occasion of a second signal in a set of time resources, the second signal being a signal that the terminal needs to monitor, the first signal corresponding to the monitoring occasion of a specific signal in the set of time resources.

[0025] In an eighth aspect, a network-side device is provided, comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement the steps of the signal synchronization method according to the second aspect.

[0026] In a ninth aspect, a network-side device is provided, comprising a processor and a communication interface, wherein the communication interface is configured to transmit a first signal for synchronization if a first condition is met, the first condition at least comprising that there is at least one monitoring occasion of a second signal that can need to be transmitted in a set of time resources, the first signal corresponding to the monitoring occasion of a specific signal in the set of time resources.

[0027] In a tenth aspect, a readable storage medium is provided, the readable storage medium storing programs or instructions, the programs or instructions being executed by a processor to implement the steps of the signal synchronization method according to the first aspect, or to implement the steps of the signal synchronization method according to the second aspect.

[0028] In an eleventh aspect, a wireless communication system is provided, comprising a terminal and a network-side device, the terminal being configured to implement the steps of the signal synchronization method according to the first aspect, and the network-side device being configured to implement the steps of the signal synchronization method according to the second aspect.

[0029] In a twelfth aspect, a chip is provided, comprising a processor and a communication interface, the communication interface being coupled to the processor, the processor being configured to run programs or instructions to implement the signal synchronization method according to the first aspect, or to implement the signal synchronization method according to the second aspect.

[0030] In a thirteenth aspect, a computer program / program product is provided, the computer program / program product being stored in a storage medium, the computer program / program product being executed by at least one processor to implement the steps of the signal synchronization method according to the first aspect, or to implement the steps of the signal synchronization method according to the second aspect.

[0031] In the embodiments of the present application, if there is at least one monitoring occasion of the second signal in the set of time resources, the terminal assumes that the first signal for synchronization can be received in the first time resource, the first signal corresponds to the monitoring occasion of the specific signal in the set of time resources, and the synchronization of the second signals of the plurality of terminals can use the same first signal, thereby reducing the overhead of the first signal, providing the synchronization signal for the terminal in time, and improving the resource utilization efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0032] FIG. 1 is a block diagram of a wireless communication system to which the embodiments of the present application can be applied;

[0033] FIG. 2 is a flow diagram of a signal synchronization method according to an embodiment of the present application;

[0034] FIG. 3 is an example diagram in which a set of time resources includes a plurality of LOs according to an embodiment of the present application;

[0035] FIG. 4 is an example diagram in which a set of time resources includes a plurality of LOs according to an embodiment of the present application;

[0036] FIG. 5 is an example diagram in which a set of time resources includes a plurality of LOs according to an embodiment of the present application;

[0037] FIG. 6 is an example diagram in which a set of time resources includes only one LO according to an embodiment of the present application;

[0038] FIG. 7 is an example diagram in which a set of time resources includes only one LO according to an embodiment of the present application;

[0039] FIG. 8 is a diagram of transmission and monitoring of an on-demand LP-SS according to an embodiment of the present application;

[0040] FIG. 9 is an example diagram in which an on-demand LP-SS is located in a specific time resource in a set of time resources according to an embodiment of the present application;

[0041] FIG. 10 is an example diagram in which an on-demand LP-SS is located in a first MO in a set of time resources, and the MO is used only for transmitting the on-demand LP-SS according to an embodiment of the present application;

[0042] FIG. 11 is an example diagram in which an on-demand LP-SS is located in a first MO in a set of time resources, and the MO can also transmit an LP-WUS according to an embodiment of the present application;

[0043] FIG. 12 is a diagram of transmission and monitoring of an on-demand LP-SS according to an embodiment of the present application;

[0044] FIG. 13 is a schematic diagram of a transmission of a multi-beam on-demand LP-SS according to an embodiment of the present application;

[0045] FIG. 14 is a schematic diagram of a transmission of a multi-beam on-demand LP-SS according to an embodiment of the present application;

[0046] FIG. 15 is a schematic diagram of a transmission of a multi-beam on-demand LP-SS according to an embodiment of the present application;

[0047] FIG. 16 is a schematic diagram of a method for signal synchronization according to an embodiment of the present application;

[0048] FIG. 17 is a schematic diagram of a device for signal synchronization according to an embodiment of the present application;

[0049] FIG. 18 is a schematic diagram of a device for signal synchronization according to an embodiment of the present application;

[0050] FIG. 19 is a schematic diagram of a communication device according to an embodiment of the present application;

[0051] FIG. 20 is a schematic diagram of a hardware structure of a terminal according to an embodiment of the present application;

[0052] FIG. 21 is a schematic diagram of a network-side device according to an embodiment of the present application. DETAILED DESCRIPTION

[0053] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all of them. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0054] The terms "first", "second", and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by "first", "second" are usually a category, not limited to the number of objects, for example, the first object can be one or more. In addition, "or" in the present application means at least one of the connected objects. For example, the protection scope of "A or B" at least covers three schemes, namely, scheme one: including A and not including B; scheme two: including B and not including A; scheme three: including A and B. In addition, the terms "A and / or B", "at least one of A and B", "at least one of A or B" also at least cover the above three schemes, respectively. The character " / " generally represents that the objects before and after are in an "or" relationship.

[0055] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). The direct indication can be understood as that the sender explicitly informs the receiver of specific information, operations to be performed or requested results, etc. in the sent indication. The indirect indication can be understood as that the receiver determines the corresponding information according to the indication sent by the sender, or judges and determines the operations to be performed or the requested results according to the judgment result.

[0056] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than the NR system, such as 6th Generation (6G) communication systems. th

[0057] ​FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a terminal-side device such as a mobile phone, a Tablet Personal Computer, a Laptop Computer, a notebook computer, a Personal Digital Assistant (PDA), a palmtop computer, a netbook, an Ultra-mobile Personal Computer (UMPC), a Mobile Internet Device (MID), an Augmented Reality (AR) device, a Virtual Reality (VR) device, a robot, a wearable device, a flight vehicle, a Vehicle User Equipment (VUE), a shipboard device, a Pedestrian User Equipment (PUE), a smart home (a home device with a wireless communication function such as a refrigerator, a television, a washing machine, or furniture), a game console, a Personal Computer (PC), a kiosk, or a self-service machine. The wearable device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, etc.), a smart wristband, smart clothes, etc. The vehicle-mounted device can also be referred to as a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network-side device 12 can include an access network device or a core network device. The access network device can also be referred to as a Radio Access Network (RAN) device, a radio access network function, or a radio access network unit. The access network device can include a base station, a Wireless Local Area Network (WLAN) Access Point (AP), or a Wireless Fidelity (WiFi) node, etc.The base station can be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a relay station (RBS), a serving base station (SBS), a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home Node B (HNB), a home evolved Node B, a transmit / receive point (TRP), or some other suitable terminology in the art, and is not limited to a particular technical terminology, provided that the same technical effect is achieved. It should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0058] The core network device can also be referred to as a core network node, a core network function, or a core network network element, etc., which includes but is not limited to at least one of the following: a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (L-NEF), a binding support function (BSF), an application function (AF), a location management function (LMF), a gateway mobile location center (GMLC), a network data analytics function (NWDAF), etc. It should be noted that only the core network device in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the core network device is not limited. If the name of the core network device mentioned in the embodiments of the present application changes in the subsequent protocol version (for example, 6G), it is also within the protection scope of the present application.

[0059] Optionally, the core network device can be implemented by one or more function modules in one device, or can be implemented by multiple devices together, and the embodiments of the present application do not make a specific limitation. It can be understood that the above function modules can be network elements in a hardware device, can be software function modules running on a dedicated hardware, or can be virtualized function modules instantiated on a platform (for example, a cloud platform).

[0060] In the related art, a periodic synchronization signal LP-SS for LP-WUR synchronization is considered. When the LP-SS period is long, due to the residual time-frequency offset after LP-SS synchronization, the accumulated time-frequency offset when receiving the LP-WUS is large, which affects the reception performance of the LP-WUS. Therefore, the related art also considers a non-periodic synchronization signal preamble, which is transmitted before each LP-WUS. When the LP-WUS is transmitted densely, the overhead of the preamble is too large. In order to reduce the overhead, it is also considered to transmit the preamble before the LP-WUS when the time interval between the LP-WUS and the LP-SS is greater than a threshold. For example, if the time interval between LP-WUS1 and LP-SS is less than the threshold, no preamble is transmitted before LP-WUS1. If the time interval between LP-WUS2 and LP-SS is greater than the threshold, a preamble is transmitted before LP-WUS2. If the time interval between LP-WUS3 and LP-SS is greater than the threshold, a preamble is transmitted before LP-WUS3. However, when the time interval between LP-WUS2 and LP-WUS3 is very small, the two LP-WUSs both transmit the preamble, which also causes unnecessary overhead.

[0061] In order to solve the problems in the related art, the present application proposes a synchronization signal design method for LP-WUR synchronization with higher resource efficiency. The present application is also applicable to other receiver types, such as a main radio (MR), for synchronization.

[0062] The synchronization signal involved in the present application can be a low-power signal based on On-Off Keying (OOK) modulation, or a signal based on Orthogonal Frequency Division Multiplexing (OFDM), such as a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Channel State Information-Reference Signal (CSI-RS), a Tracking Reference Signal (TRS), and the like.

[0063] The signal synchronization method, the terminal, and the network-side device provided by the embodiments of the present application will be described below in combination with the accompanying drawings and some embodiments and application scenarios.

[0064] FIG. 2 is a flowchart of a signal synchronization method provided by an embodiment of the present application. As shown in FIG. 2, the signal synchronization method comprises the following steps.

[0065] In step 210, the terminal assumes that a first signal for synchronization can be received in a first time resource under a first condition.

[0066] The first condition at least comprises a listening occasion of at least one second signal in a group of time resources, the second signal being a signal that needs to be monitored by the terminal.

[0067] The first signal corresponds to the listening occasion of a specific signal in the group of time resources.

[0068] It can be understood that if there is at least one listening occasion of a second signal in a group of time resources, the terminal assumes that a first signal for synchronization can be received in a first time resource.

[0069] Optionally, the specific signal is one or more signals that need to be monitored by the terminal.

[0070] In some embodiments, the second signal is a low power wake-up signal (LP-WUS) for waking up the terminal. The monitoring occasion of the second signal can refer to a low power wake-up signal monitoring occasion (MO) or a low power wake-up signal occasion (LO) of the second signal. Each LO contains one or more LP-WUS monitoring occasions (MOs), and the terminal can monitor the second signal in each MO of the second signal. According to an implementation, if the terminal detects a LP-WUS corresponding to the terminal in one of the MOs, the terminal can stop detecting other MOs in the MOs.

[0071] The second signal and the MO or LO of the second signal are determined according to a terminal-specific identifier.

[0072] It can be understood that the terminal determines the MO or LO of the LP-WUS to be monitored by the terminal according to a terminal-specific identifier, such as a UE-ID, a C-RNTI, or information configured by a network-side device, or a subgroup / group-specific identifier, such as a UE subgroup ID.

[0073] The monitoring occasion of the specific signal in the set of time resources can refer to a monitoring occasion MO or a low power wake-up signal occasion LO of the low power wake-up signal. The low power wake-up signal can be a LP-WUS for waking up one terminal or multiple terminals. From the perspective of a single terminal, the one terminal can only detect the LP-WUS associated with itself in the MO / LO of the LP-WUS associated with itself.

[0074] It should be noted that in the embodiments of the present application, monitoring, monitoring, and detection can be replaced with each other.

[0075] Optionally, the set of time resources refers to a set of MOs or LOs. The first signal corresponds to the MOs or LOs in the set of time resources, including: the first signal corresponds to one or more MOs in the set of time resources, or the first signal corresponds to one or more LOs in the set of time resources.

[0076] The first signal corresponds to the monitoring occasion of the specific signal in the set of time resources, which can be understood as that the first signal can be used for synchronization of the specific signal in the set of time resources. The specific signal can be a signal to be monitored by the current terminal, or a signal to be monitored by other terminals.

[0077] When the second signal or the specific signal is a low-power wake-up signal, the first signal corresponds to multiple MOs or LOs, where the MOs or LOs are not limited to the MOs or LOs of the current terminal, and can be the MOs or LOs of other terminals. It can be understood that the first signal can be used for synchronization of the second signal of one or more terminals.

[0078] The first signal corresponds to multiple MOs or LOs, so that the synchronization of the second signals of multiple terminals can use the same first signal, thereby reducing the number of times of sending the first signal, providing a synchronization signal for the terminal in time, and minimizing the overhead of the synchronization signal, and improving resource utilization efficiency.

[0079] The present application is applicable to RRC idle / inactive state, and is also applicable to RRC connected state. It is applicable to the scenario of receiving paging by waking up based on LP-WUS, and is also applicable to the scenario of monitoring PDCCH or starting DRX by waking up based on LP-WUS, and is also applicable to other scenarios of waking up based on LP-WUS. It should be noted that the present application is also applicable to other scenarios of needing to assist synchronization or measurement by means of aperiodic signals, which can be independent of LP-WUS, that is, the second signal and the specific signal can be other signals that need to be monitored by the terminal. In the following, for the convenience of description, the second signal is taken as LP-WUS for illustration.

[0080] For the convenience of description, a time interval for monitoring LP-WUS, LP-WUS occasion (LO) is defined. Each LO contains one or more LP-WUS monitoring occasions (MOs), and the UE can monitor the LP-WUS in each LP-WUS MO.

[0081] For example, one LO contains N*K LP-WUS MOs, where N is the total number of beams applicable to LP-WUS transmission, and K is the number of MOs corresponding to the LP-WUS of the same beam. Similarly, the LP-SS can also contain N*K LP-SS occasions, and in a typical scenario, K=1. In the following embodiments, unless otherwise specified, the LP-WUS and LP-SS of a single beam are described, but can be extended to the case of multiple beams.

[0082] The UEs monitoring the same paging occasion (PO) can be divided into multiple subgroups. The LP-WUS can provide wake-up indication for each subgroup. According to one implementation, the UEs monitoring the same PO monitor the same LO, or according to another implementation, the UEs monitoring different POs monitor the same LO, for example, one LP-WUS can be used to wake up the UEs of one or more subgroups in multiple POs, or according to another implementation, the UEs monitoring the same PO can be divided into multiple subgroup sets, and the UEs in the same subgroup set monitor the same LO. For the convenience of description, the UEs monitoring the same PO monitor the same LO are taken as an example, but the present application is applicable to all the above manners.

[0083] Optionally, the network side device can send the second signal at the MO or LO of the signal (the second signal) to be monitored by the terminal.

[0084] The signal synchronization method provided by the embodiments of the present application can reduce the overhead of the first signal, provide the synchronization signal for the terminal in time, and improve the resource utilization efficiency, if at least one listening occasion of the low-power wake-up signal (LP-WUS) for waking up the terminal is in a set of time resources, the terminal assumes that the first signal for synchronization can be received in the first time resource, and the first signal corresponds to the MO or LO in the set of time resources.

[0085] In some embodiments, the set of time resources is one of the following:

[0086] a) a set of listening occasions of the second signal to be monitored by the terminal corresponding to the same reference point;

[0087] It can be understood that the set of time resources is a set of MOs or LOs to be monitored by the terminal, and the set of MOs or LOs corresponds to the same reference point.

[0088] b) a time window of N first time lengths T1 or a part of time resources in the time window divided between two adjacent third signals, and the third signal is a periodically transmitted synchronization signal.

[0089] The third signal is a periodically transmitted synchronization signal, for example, a periodic LP-SS (P-LP-SS).

[0090] It can be understood that the interval between two periodically transmitted synchronization signals is divided into N time windows, and the set of time resources is the N time windows or a part of time resources in the N time windows. At least one time window or a part of time resources in the time window in the N time windows or the N time windows is the MO or LO of the signal to be monitored by the terminal.

[0091] The signal synchronization method provided by the embodiments of the present application can be a set of MOs or LOs corresponding to the same reference point that the terminal needs to monitor, or can be a time window of N first time lengths T1 or part of the time resources in the time window, which are divided between the two adjacent periodically transmitted synchronization signals, so that whether the network node transmits the first signal can be determined according to the interval between the MO / LO and the periodically transmitted synchronization signal.

[0092] Optionally, the first time length satisfies one of the following conditions:

[0093] T1=T / N;

[0094] T1=(T-T3) / N;

[0095] T1 is configured by the network;

[0096] wherein T is the period of the third signal, T3 is the time length of one third signal, and N is the number of time windows configured by the network or predefined by a standard.

[0097] Optionally, the time resource position of each time window can be determined by the time resource position of the third signal and the number N of time windows, wherein the time resource of the third signal and N are configured by the network side device or predefined by a standard.

[0098] Optionally, if N is predefined by a standard, the value of N can be different for different subcarrier spacings SCS and / or the number M of OOK symbols in one OFDM symbol.

[0099] The length of each time window is T1=T / N, T is the period of the third signal, or T1=(T-T3) / N, wherein T3 is the time length of the third signal, or T1 is configured by the network. If T or (T-T3) is not an integer multiple of N, then in the N time windows, there is one time window with a shorter length, for example, the lengths of the other N-1 time windows are T1 respectively, and the length of the last time window is T-(N-1)*T1.

[0100] In some embodiments, the start position of the first time window is the start position of the first third signal in the adjacent two third signals, or the end position of the first third signal, or the middle position of the first third signal.

[0101] For example, the start position of the first time window is the start position of the first P-LP-SS signal, or the end position of the first P-LP-SS signal, or the middle position of the first P-LP-SS signal.

[0102] In some embodiments, the set of time resources are a set of monitoring occasions of a specific set of signals corresponding to a same reference point; at least one monitoring occasion of the set of monitoring occasions of the specific set of signals is a monitoring occasion of the second signal.

[0103] It can be understood that the set of time resources are a set of MOs or LOs corresponding to a same reference point; at least one MO or LO of the set of MOs or LOs is a MO or LO of the second signal.

[0104] It can be understood that at least one MO or LO of the set of time resources is a MO or LO of a signal that the terminal needs to monitor.

[0105] The signal synchronization method provided by the embodiments of the present application can be that the set of time resources are a set of MOs or LOs corresponding to a same reference point, and as long as there is a MO / LO of the terminal that needs to be monitored, the terminal considers that there is a first signal transmission in the corresponding first time resource.

[0106] In some embodiments, the same reference point is one of the following:

[0107] a paging occasion (PO);

[0108] a paging frame (PF);

[0109] a time slot, a subframe or a system frame in which the PO is located.

[0110] For example, the MOs / LOs included in the set of time resources correspond to a same PO, or the MOs / LOs included in the set of time resources correspond to multiple POs. The multiple POs are POs of Npf PFs, wherein the Npf PFs are determined according to a predefined rule.

[0111] For example, a first PF of the Npf PFs is determined according to a predefined rule, thereby determining the Npf PFs that are continuous from the first PF.

[0112] For example, a first PF corresponding to the set of time resources is (SFN for PF)-floor(iPO / Ns)*T / N, wherein SFN for PF can be determined according to (SFN+PF_offset)mod T=(T div N)*(UE_ID mod N), wherein iPO is a number of POs corresponding to the MOs / LOs of the set of time resources, T is a DRC cycle, Ns is a number of POs of a PF, and N is a number of PFs in a cycle. In this case, the reference point is a PO of a first PF of the Npf PFs. If Npf=1, the reference point is a first PO of a PF.

[0113] FIG. 3, FIG. 4 and FIG. 5 respectively give an example of a set of time resources including multiple LOs.

[0114] FIG. 3 is an example diagram of a set of time resources including multiple LOs according to an embodiment of the present disclosure. In FIG. 3, the set of time resources corresponds to LOs of multiple POs, and the LP-WUS in each LO is used for wakeup of a subgroup in one PO.

[0115] FIG. 4 is an example diagram of a set of time resources including multiple LOs according to an embodiment of the present disclosure. In FIG. 4, the set of time resources corresponds to LOs of multiple POs, and the LP-WUS in each LO is used for wakeup of a subgroup in one or more POs.

[0116] FIG. 5 is an example diagram of a set of time resources including multiple LOs according to an embodiment of the present disclosure. In FIG. 5, the set of time resources corresponds to multiple LOs of one PO, and the LP-WUS in each LO is used for wakeup of a subgroup in a different subgroup set in one PO.

[0117] Each PO in FIG. 3 to FIG. 5 can belong to the same or different PFs.

[0118] FIG. 6 is an example diagram of a set of time resources including only one LO according to an embodiment of the present disclosure. In FIG. 6, the set of time resources corresponds to one LO of multiple POs, and the LP-WUS in this LO is used for wakeup of a subgroup in one or more POs.

[0119] FIG. 7 is an example diagram of a set of time resources including only one LO according to an embodiment of the present disclosure. In FIG. 7, the set of time resources corresponds to one LO of one PO, and the LP-WUS in this LO is used for wakeup of a subgroup in one PO.

[0120] In some embodiments, the set of time resources is a set of MOs or LOs corresponding to a transmission occasion of two adjacent first signals.

[0121] In some embodiments, the first signal is a non-periodic synchronization signal, such as an on demand LP-SS or preamble. Hereinafter, the first signal is exemplified by on demand LP-SS, but can be replaced by on-demand preamble.

[0122] If there is at least one LP-WUS that can be transmitted in a set of time resources, the network side device transmits an on-demand LP-SS in a specific time resource. If there is no LP-WUS to be transmitted in a set of time resources, the network side device can not transmit an on-demand LP-SS. From the UE side, if there is at least one MO (monitoring occasion) or LO (LP-WUS occasion) of the LP-WUS that the UE needs to monitor in a set of time resources, the UE assumes that there is an on-demand LP-SS in a specific time resource, which can be used for synchronization.

[0123] To ensure that the reception performance of the LP-WUS is not significantly affected by the time-frequency offset, the network side device should transmit a synchronization signal, such as an LP-SS, within a period of time Td, for example, 160 ms, before receiving the LP-WUS. Generally, the shortest time interval Td required for time-frequency synchronization is shorter than the shortest period Tr required by the requirement of cell quality measurement, for example, the RRM requirement of RRM measurement.

[0124] To meet the requirements of synchronization and RRM, the network side device can periodically transmit an LP-SS, and the period of the LP-SS is no more than Td. However, due to the low probability of transmission of the LP-WUS in some scenarios, for example, when the paging rate is low, there can be a long period without transmission of the LP-WUS. In such a scenario, if the LP-SS is still transmitted according to a smaller period Td, the resource efficiency is low. To improve the resource efficiency, the network side device can transmit a periodic LP-SS with a period Tr that meets the measurement requirement, and decide whether to non-periodically transmit a synchronization signal for time-frequency synchronization according to whether there is a transmission requirement of the LP-WUS. Correspondingly, the terminal side device can monitor the periodic LP-SS and monitor the on-demand LP-SS to achieve better synchronization accuracy.

[0125] In some embodiments, the first condition further includes one of:

[0126] a) the time interval between the transmission occasion of the first signal and the most recent one of the periodically transmitted synchronization signals is greater than or equal to a first time threshold; and

[0127] It can be understood that, when the time interval between the transmission occasion of the first signal and the most recent one of the periodically transmitted synchronization signals is greater than or equal to a first time threshold, and there is at least one MO or LO of the second signal in a set of time resources, the terminal assumes that the first signal can be received in the first time resource.

[0128] Optionally, if the time interval between the transmission occasion of the first signal and the latest periodically transmitted synchronization signal is less than the first time threshold, the network side device does not transmit the first signal. Correspondingly, the terminal also considers that there is no first signal in the transmission occasion of the first signal.

[0129] b) the time interval between the set of time resources and the latest third signal for synchronization is greater than or equal to the first time threshold;

[0130] It can be understood that there is at least one MO or LO of the second signal in the set of time resources, and the time interval between the set of time resources and the latest periodically transmitted synchronization signal is greater than or equal to the first time threshold. The terminal assumes that the first signal can be received in the first time resource.

[0131] The set of time resources is a set of MOs or LOs that the terminal needs to monitor. The terminal determines whether there is an on-demand LP-SS according to the interval between the set of time resources and the periodic LP-SS (P-LP-SS).

[0132] c) the set of time resources is the i-th time window in N time windows between adjacent two third signals, or is located in the i-th time window, where i>1.

[0133] It can be understood that the set of time resources is the i-th time window in N time windows between adjacent two third signals or is located in the i-th time window, i>1, and there is at least one MO or LO of the second signal in the set of time resources. The terminal assumes that the first signal can be received in the first time resource.

[0134] The terminal can determine whether there is an on-demand LP-SS according to the MO / LO of the second signal in the i-th time window in N time windows between adjacent two third signals, or according to the MO / LO of the second signal being the i-th time window, or according to the interval between the time window and the P-LP-SS.

[0135] Assume the network side device transmits the third signal, which is periodic LP-SS with a period of T=640ms. The time resources between two adjacent P-LP-SSs are divided into N=4 equally spaced time windows, each of which has a length of 160ms. The set of time resources is one time window in this example. The first time window has no on-demand LP-SS. Because the time interval between the first time window and the first P-LP-SS is small, the first P-LP-SS can provide a good synchronization reference for the LP-WUSs in this time window. The second, third, and fourth time windows have corresponding on-demand LP-SS occasions, respectively. Because the time intervals between the second, third, and fourth time windows and the first P-LP-SS are large, the first P-LP-SS cannot provide a good synchronization reference for the LP-WUSs in these time windows. Therefore, if there is a potential LP-WUS to be transmitted in the ith (i>1) time window, the network side device needs to transmit an on-demand LP-SS to provide synchronization for the LP-WUS in this time window. If there is no potential LP-WUS to be transmitted in this time window, the network side device does not need to transmit an on-demand LP-SS. FIG. 8 is one of the schematic diagrams of transmission and monitoring of on-demand LP-SS provided by the embodiments of the present application. As shown in FIG. 8, in the second and third time windows, although there are MO / LO for LP-WUS transmission, there is no potential LP-WUS to be transmitted, so the network side device does not need to transmit an on-demand LP-SS. In the fourth time window, the network side device transmits the LP-WUS of UE3, so the network side device transmits an on-demand LP-SS in the first time resource of the on-demand LP-SS corresponding to the fourth time window. In the first time window, although the network side device transmits the LP-WUS of UE1, it does not need to transmit an on-demand LP-SS, or it is understood that there is no first time resource of the on-demand LP-SS corresponding to this time window.

[0136] The signal synchronization method provided in the embodiments of the present application can reduce the overhead of the first signal, provide the terminal with a synchronization signal in time, and improve resource utilization efficiency.

[0137] Optionally, the set of time resources are a set of MOs or LOs between the transmission occasions of two adjacent third signals.

[0138] In some embodiments, the first time resource is the latest transmission occasion of the first signal before the second signal,

[0139] The transmission occasion of the first signal is determined according to at least one of the following modes:

[0140] 1) The transmission occasion of the first signal is determined according to a network configured period T Ondemand and an offset OFFSET Ondemand .

[0141] It should be noted that the period and offset corresponding to the first signal are respectively (independently) configured with the period and offset of the periodic synchronization signal.

[0142] The transmission occasion of the on-demand LP-SS is determined by a network configured period T Ondemand and an offset OFFSET Ondemand . Optionally, the configuration needs to meet that, within X ms before the LO that the UE needs to monitor, there is at least one P-LP-SS or on-demand LP-SS transmission occasion, to ensure that better time synchronization can be provided, for example, X = 160 ms.

[0143] Optionally, the configuration can be independent of the time position of the MO / LO in the set of time resources.

[0144] 2) The transmission occasion of the first signal is determined according to the time position of the latest third signal for synchronization before the second signal.

[0145] In some embodiments, the position of the first time resource is determined according to a period of the third signal and a time resource of a third signal adjacent to the second signal,

[0146] wherein a time interval between the first time resource and the time resource of the third signal adjacent to the second signal is T / N*i or T / N*i+offset, T is the period of the third signal, i is one of [1, 2, …, N-1], N is a positive integer, and offset is configured by a network or predefined by a protocol.

[0147] Optionally, the transmission occasion of the first signal is a time position of an On-demand LP-SS occasion.

[0148] Optionally, the time position of the On-demand LP-SS occasion is T / N*i+OFFSET1 or T / N*i+OFFSET2, wherein OFFSET1 is a time offset used for determining a P-LP-SS time resource, OFFSET2 is a time offset used for determining a time resource relative to the P-LP-SS time resource, i = 1, 2, 3, 5, 6, 7, …, i.e., i is not an integer multiple of N. For example, T = 640 ms, N = 4, OFFSET1 = 10 ms, the start points of the P-LP-SS occasions are 10 ms, 650 ms, 1290 ms, …, respectively, and the start points of the On-demand LP-SS occasions are 170 ms, 290 ms, 490 ms, 810 ms, …, respectively.

[0149] Optionally, the time position of the On-demand LP-SS occasion is configured by a network, for example, a configuration period and an offset. If an interval between one On-demand LP-SS occasion and a preceding P-LP-SS is less than a first time threshold, the On-demand LP-SS occasion is invalid. If the network needs to send an On-demand LP-SS, the network can only send the On-demand LP-SS in a valid On-demand LP-SS occasion.

[0150] Optionally, the time position of the On-demand LP-SS occasion is determined according to a time resource of a corresponding time window.

[0151] Optionally, the transmission occasion of the On-demand LP-SS corresponding to one time window is a nearest On-demand LP-SS transmission occasion before a first MO in the time window.

[0152] In some embodiments, the starting point of the transmission occasion of the first signal is one of:

[0153] a starting point position of a time window corresponding to the first signal;

[0154] a sum of the starting point position of the time window corresponding to the first signal and a first offset value;

[0155] a sum of a starting point position of a first MO in the time window corresponding to the first signal and a second offset value;

[0156] wherein the first offset value can be a positive number or a negative number, and the second offset value is a negative number.

[0157] For example, the starting point of the on-demand LP-SS occasion is the starting point of the corresponding time window, or the starting point of the corresponding time window + the first offset value OFFSET3, wherein the first offset value OFFSET3 can be a positive number or a negative number, or the starting point of the first MO in the corresponding time window + the second offset value OFFSET4, wherein the second offset value OFFSET4 is a negative number.

[0158] Optionally, according to the interval between the MO / LO and the periodic LP-SS and whether there is an LP-WUS, the network side device determines whether to send the non-periodic synchronization signal (on-demand LP-SS), and the terminal assumes whether the network side device has sent the non-periodic synchronization signal.

[0159] Each UE monitors the MO / LO associated with itself. If there is a corresponding first time resource for transmitting On-demand LP-SS in a time window, such as time window 2, 3, 4, the UE whose MO / LO is located in the corresponding time window can monitor the On-demand LP-SS in the corresponding On-demand LP-SS occasion. But it is not excluded that the UE implementation can also not monitor this on-demand LP-SS. If there is no corresponding On-demand LP-SS occasion in a time window, such as time window 1, the UE whose MO / LO is located in the corresponding time window does not assume that the network device transmits On-demand LP-SS. For example, UE1 and UE2 assume no on-demand LP-SS when monitoring the first own LO (1st time window), but assume on-demand LP-SS when monitoring the second own LO (3rd time window). UE3 and UE4 assume corresponding on-demand LP-SS when monitoring the two own LOs (2nd and 4th time windows). Equivalently, the UE finds the synchronization occasion of the nearest On-demand LP-SS before the MO / LO according to the time position of the MO / LO to be monitored.

[0160] Since the transmission of on-demand LP-SS by the network side device depends not only on the interval of this time window and the periodic LP-SS, but also on whether there is at least one LO with pending LP-WUS in this time window, the UE cannot determine in advance whether the network side device will transmit LP-WUS in this UE's LO. Alternatively, whether the UE decides to detect LP-WUS based on whether on-demand LP-SS appears or not can be left to UE implementation, or predefined by the standard. According to one way, the UE monitors according to the assumption that there is LP-WUS. For example, in the time window (the second time window) where the first LO of UE3 is located, there is no LP-WUS to be transmitted by any UE, the network side device does not transmit on-demand LP-SS, and does not transmit any LP-WUS, but UE3 can receive according to the assumption that the network side device transmits on-demand LP-SS. Correspondingly, UE3 detects its own LP-WUS. If the UE's own LP-WUS is monitored, UE3 considers itself to be woken up, and the MR performs the corresponding operation, otherwise it is not woken up. According to another way, UE3 judges whether on-demand LP-SS is transmitted, for example, DTX detection. If it is judged that on-demand LP-SS is not transmitted, the detection of LP-WUS can not be continued. Alternatively, if UE3 judges that on-demand LP-SS is not transmitted, UE3 can continue to attempt to detect LP-WUS, for example, by sliding to detect LP-WUS, in order to reduce the influence of synchronization error. Alternatively, if UE3 judges that on-demand LP-SS is not transmitted, UE opens the MR, for example, monitors whether there is paging in the PO.

[0161] In this example, within 160ms before the LO that the UE needs to monitor, there is at least one P-LP-SS or on-demand LP-SS, in order to provide better time synchronization, so as to ensure the reception performance of LP-WUS.

[0162] 3) The transmission occasion of the first signal is a given time resource in the group of time resources.

[0163] The transmission occasion of on-demand LP-SS is determined according to the time position of at least one MO / LO in the group of time resources.

[0164] If the network node transmits on-demand LP-SS in a specific time resource (the transmission occasion of on-demand LP-SS), the on-demand LP-SS is for a group of time resources, which can be understood as this on-demand LP-SS being a common synchronization signal for multiple MO / LOs of this group of time resources.

[0165] In some embodiments, the transmission occasion of the first signal is a given time resource in the set of time resources, including one of the following:

[0166] The X1 OFDM symbols or OOK symbols starting from the beginning of the first Y listening occasions in the set of time resources are the transmission occasion of the first signal;

[0167] The X2 OFDM symbols or OOK symbols or X3 ms or us before the beginning of the first listening occasion in the set of time resources are the beginning, and the time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal;

[0168] The X4 OFDM symbols or OOK symbols or X5 ms or us after the beginning of the set of time resources are the beginning, and the time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal;

[0169] The X6 OFDM symbols or OOK symbols or X6 ms or us before the beginning of the set of time resources are the beginning, and the time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal;

[0170] Wherein, Y, X1, X2, X3, X4, X5 or X6 is protocol predefined or network configured.

[0171] FIG. 9 is an example diagram of the On-demand LP-SS located in a specific time resource in a set of time resources according to an embodiment of the present application. As shown in FIG. 9, a specific time resource (identified as a synchronization occasion in FIG. 9) in a set of time resources Ri can be used to send the On-demand LP-SS. The specific time resource can be determined according to a network node configured or standard predefined offset and reference time point. For example, the network node configures OFFSET 4, and the beginning or ending position of the specific time resource is OFFSET 4 relative to the reference time point Ref1, wherein OFFSET 4 takes a negative value. The reference time point Ref1 is the beginning of the first MO in the set of time resources Ri, or is a PO corresponding to the set of time resources Ri, or is the beginning of the first PO in a set of POs or the beginning of the slot / subframe / system frame where the PO is located. FIG. 9 is also applicable to the transmission occasion of the On-demand LP-SS determined according to the network configured period T_ Ondemand and offset OFFSET Ondemand . At this time, the position identified as the synchronization occasion in FIG. 9 is not determined according to the set of time resources, but is determined according to the network configured period T Ondemandand offset OFFSET Ondemand is determined.

[0172] If there is LP-WUS to transmit in a set of time resources R1, the network node transmits On-demand LP-SS in the synchronization occasion in the first set of time resources R1, otherwise the network node can not transmit On-demand LP-SS.

[0173] UE behavior: If a set of time resources Ri contains a MO / LO that a UE needs to monitor, the UE assumes that there is On-demand LP-SS in the synchronization occasion in the set of time resources Ri. The UE can synchronize based on the On-demand LP-SS and try to receive LP-WUS in its own MO. For example, in a set of time resources R1, UE1 and UE2 can synchronize using the On-demand LP-SS in the synchronization occasion in R1 and try to receive LP-WUS in their own MO1 and MO2. In a set of time resources R2, UE3 and UE4 can synchronize using the On-demand LP-SS in the synchronization occasion in R2 and try to receive LP-WUS in their own MO1 and MO2.

[0174] It is worth noting that from the perspective of a single UE, the UE can find the synchronization occasion of the nearest On-demand LP-SS before the MO / LO it needs to monitor only according to the time location of the MO / LO. The set of time resources Ri can be understood as a set of MO / LOs corresponding to the same reference point that the UE needs to monitor. Other examples are the same.

[0175] FIG. 10 is an example diagram in which the On-demand LP-SS is located in the first MO (Y=1) of a set of time resources and this MO is only used to transmit the On-demand LP-SS. In the example of FIG. 10, the first MO in a set of time resources Ri can be used to transmit the On-demand LP-SS, but cannot transmit the LP-WUS (or the payload of the LP-WUS). For example, in a set of time resources R1, there is LP-WUS to transmit, and the network node transmits the On-demand LP-SS in the first MO in the first set of time resources R1, such as MO 0 in the figure. The network node transmits the LP-WUS of UE1 in MO1 of UE1. The network node transmits the LP-WUS of UE2 in MO2 of UE2. In a set of time resources R2, there is no LP-WUS to transmit, so the network node does not transmit the LP-WUS, nor the On-demand LP-SS.

[0176] UE behavior: If a set of time resources Ri contains a MO / LO that a UE needs to monitor, the UE assumes that there is an On-demand LP-SS in the first MO of the set of time resources Ri. The UE can synchronize based on the On-demand LP-SS and try to receive LP-WUS in its own MO. For example, UE1 and UE2 assume that there is an on-demand LP-SS in MO 0 of the set of time resources R1, can synchronize, and try to receive LP-WUS in their own MO1 and MO2. UE3 and UE4 assume that there is an on-demand LP-SS in the first MO of the set of time resources R2 and try to receive LP-WUS in their own MO1 and MO2.

[0177] According to the two examples of FIG. 10, the MO used to transmit the On-demand LP-SS can or can not belong to LO1. If it belongs to LO1, the number of MOs in LO1 is greater than the number of MOs in other LOs because one MO is dedicated to transmit the On-demand LP-SS.

[0178] FIG. 11 is an example diagram of On-demand LP-SS located in the first MO (Y = 1) of a set of time resources and this MO can also transmit LP-WUS according to embodiments of the present application.

[0179] In the example of FIG. 11, the first MO of a set of time resources Ri can be used to transmit the On-demand LP-SS and can also transmit LP-WUS (or the payload of LP-WUS). For example, in the set of time resources R1, there is LP-WUS to transmit, the network node transmits the On-demand LP-SS in the first MO of the set of time resources R1, e.g., in MO1 of UE1 LO in FIG. 11, and transmits the LP-WUS of UE1 in this MO. The network node transmits the LP-WUS of UE2 in MO2 of UE2. UE2 can synchronize using the On-demand LP-SS in MO1 of UE1 LO. In the set of time resources R2, there is no LP-WUS to transmit, therefore the network node does not transmit LP-WUS and does not transmit the On-demand LP-SS.

[0180] UE behavior: If a set of time resources Ri contains a MO / LO that a UE needs to monitor, the UE assumes that there is an On-demand LP-SS in the first MO (not limited to this UE's MO) of the set of time resources Ri. The UE can synchronize based on the On-demand LP-SS and try to receive LP-WUS in its own MO. For example, UE2 can synchronize using the On-demand LP-SS in MO1 of UE1's LO and try to receive LP-WUS in its own MO1 and MO2. UE3 and UE4 assume that there is an on-demand LP-SS in the first MO of a set of time resources R2 and try to receive LP-WUS in their own MOs.

[0181] According to an implementation, the time length of the MOs used to send the On-demand LP-SS is longer than the time length of other MOs because the On-demand LP-SS and the LP-WUS need to be sent. Alternatively, the time length of the MOs used to send the On-demand LP-SS is the same as the time length of other MOs, which is simpler to design, but the MOs that do not need to send the On-demand LP-SS reserve some resources, which is less resource efficient. The time interval between the MOs satisfies: the interval from the end of the previous MO to the start of the second MO is the same. Alternatively, the interval from the start of the previous MO to the start of the second MO is the same, or the interval from the end of the previous MO to the end of the second MO is the same.

[0182] In some embodiments, X1 OFDM symbols or OOK symbols at the start of the first Y listening occasions in the set of time resources are the transmission occasions of the first signal, including:

[0183] The first Y listening occasions are only used to send the first signal, and other listening occasions in the set of time resources can be used to send the LP-WUS payload, where 1 <= Y <= Z, Z is the number of listening occasions contained in the set of time resources;

[0184] Alternatively,

[0185] The first Y listening occasions can be used to send the first signal and can also be used to send the LP-WUS payload.

[0186] Optionally, the listening occasions here are MOs or LOs.

[0187] In some embodiments, the time length of the first Y listening occasions is L+L1, and the time length of other listening occasions in the set of time resources is L, where L1 is the time length of the first signal, and L is the time length of the payload.

[0188] or

[0189] The time length of each listening occasion in the set of time resources is the same.

[0190] Optionally, the listening occasion here is MO or LO.

[0191] In some embodiments, the terminal assumes that there is at least one of the first signal or the third signal within a second time length before the listening occasion of the second signal.

[0192] Optionally, the second time length is the same as or different from the first time threshold.

[0193] In some embodiments, the set of time resources is a listening occasion of the second signal corresponding to the same spatial characteristic. Optionally, the listening occasion here is MO or LO.

[0194] Optionally, the corresponding to the same spatial characteristic includes one of the following: corresponding to the same transmission beam, corresponding to the same QCL source, corresponding to the same SSB index, corresponding to the same LP-SS index, corresponding to the same LP-SS beam.

[0195] According to the transmission occasion of the on-demand LP-SS and the interval of the periodic LP-SS, and whether there is an LP-WUS, the network side device determines whether to send the non-periodic synchronization signal (on-demand LP-SS), and the UE assumes whether the network side device has sent the non-periodic synchronization signal.

[0196] Assuming that the network side device configures the period T of the transmission occasion of the on-demand LP-SS Ondemand and the offset OFFSET Ondemand Whether the network side device sends the on-demand LP-SS in one transmission occasion of the on-demand LP-SS depends on the interval between this on-demand LP-SS occasion and the nearest P-LP-SS before. If it is greater than a predefined first time threshold T0, and there is at least one potential LP-WUS between this on-demand LP-SS occasion and the next on-demand LP-SS occasion, the network side device sends the on-demand LP-SS in this occasion.

[0197] In some embodiments, the first signal is sent in the first time resource, satisfying one of the following conditions:

[0198] 1) the interval between the transmission occasion of the next first signal and the transmission occasion of the latest third signal for synchronization is greater than the first time threshold, and there is at least one potential second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal;

[0199] Whether the network side device transmits an On-demand LP-SS in a transmission occasion of the On-demand LP-SS depends on the interval between the next On-demand LP-SS occasion and the latest P-LP-SS. If the interval is greater than the predefined first time threshold T0, and there is at least one potential LP-WUS between the On-demand LP-SS occasion and the next On-demand LP-SS occasion, the network side device transmits the On-demand LP-SS in the occasion. In this way, the interval between the last MO or LO of the two On-demand LP-SS occasions and the P-LP-SS is less than the first time threshold T0.

[0200] 2) the interval between the last MO or LO of the transmission occasion of the current first signal and the transmission occasion of the next first signal and the latest third signal for synchronization is greater than the first time threshold, and there is at least one potential second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal.

[0201] Whether the network side device transmits an On-demand LP-SS in a transmission occasion of the On-demand LP-SS depends on the interval between the next On-demand LP-SS occasion and the latest P-LP-SS. If the interval is greater than the predefined first time threshold T0, and there is at least one potential LP-WUS between the On-demand LP-SS occasion and the next On-demand LP-SS occasion, the network side device transmits the On-demand LP-SS in the occasion. In this way, the interval between the last MO or LO of the two On-demand LP-SS occasions and the P-LP-SS is less than the first time threshold T0.

[0202] Figure 12 is a schematic diagram of transmission and monitoring of on-demand LP-SS according to an embodiment of the present application. In Figure 12, the first on-demand LP-SS transmission occasion is less than the first time threshold T0 from the previous P-LP-SS (there is overlap in Figure 12), then no on-demand LP-SS is transmitted in the first on-demand LP-SS transmission occasion (or the transmission occasion is considered invalid), regardless of whether there is LP-WUS to be transmitted in the subsequent LO (in Figure 12, the network device transmits LP-WUS in the subsequent LO of UE1).

[0203] Each UE monitors the MO / LO of the LP-WUS associated with itself. The UE can find the transmission occasion of the nearest on-demand LP-SS before the MO / LO that the UE needs to monitor according to the time position of the MO / LO. The UE determines whether there is an on-demand LP-SS according to whether the time interval between the transmission occasion of the on-demand LP-SS and the nearest previous P-LP-SS is greater than the first predefined time threshold T0, and if it is greater than the first time threshold T0, it is considered that there is an on-demand LP-SS in the transmission occasion of the on-demand LP-SS. Alternatively, the UE determines whether there is an on-demand LP-SS according to whether the time interval between the transmission occasion of the on-demand LP-SS and the transmission occasion of the next on-demand LP-SS and the nearest previous P-LP-SS is greater than the first predefined time threshold T0, and if it is greater than the first time threshold T0, it is considered that there is an on-demand LP-SS in the transmission occasion of the on-demand LP-SS. Alternatively, the UE determines whether there is an on-demand LP-SS according to whether the time interval between the last MO between the on-demand LP-SS occasion and the next on-demand LP-SS occasion and the nearest previous P-LP-SS is greater than the first time threshold T0, and if it is greater than the first time threshold T0, it is considered that there is an on-demand LP-SS in the transmission occasion of the on-demand LP-SS.

[0204] Since the network side device sending on-demand LP-SS depends not only on the interval of on-demand LP-SS or MO / LO and periodic LP-SS, but also on whether there is at least one LO in the multiple MO / LO corresponding to this on-demand LP-SS has pending LP-WUS, UE cannot judge in advance whether the network side device will send LP-WUS in the LO of this UE. Alternatively, whether UE decides to detect LP-WUS based on whether on-demand LP-SS occurs can be left to UE implementation, or predefined by the standard. According to one way, UE monitors according to the assumption that there is own LP-WUS. Referring to FIG. 12, for example, between the first and second on-demand LP-SS occasions of the first LO of UE3, the network side device has nothing to send, the network side device does not send on-demand LP-SS, nor does it send any LP-WUS, but UE3 can receive according to the assumption that the network side device sends on-demand LP-SS in the second on-demand LP-SS occasion in FIG. 12. Correspondingly, UE3 detects own LP-WUS. If own LP-WUS is detected, UE3 considers itself to be woken up, and the MR performs corresponding operation, otherwise it is not woken up. According to another way, UE3 judges whether on-demand LP-SS is sent, for example, DTX detection. If it is judged that on-demand LP-SS is not sent, it can not continue to detect LP-WUS. Alternatively, if UE3 judges that on-demand LP-SS is not sent, UE3 can continue to attempt to detect LP-WUS, for example, by sliding to detect LP-WUS, in order to reduce the influence of synchronization error. Alternatively, if UE3 judges that on-demand LP-SS is not sent, UE opens MR, for example, monitors whether there is paging in PO.

[0205] If considering multi-beam scenario, P-LP-SS and / or on-demand LP-SS need to be transmitted N times corresponding to N beams. Then, the determination of on-demand LP-SS occasion of each beam, whether the network side device transmits on-demand LP-SS, and whether the UE considers that on-demand LP-SS occurs, can be implemented in the above described manner. For example, if in the i-th (i>2) time window, there is at least one LO in all the LOs corresponding to the j-th beam that has a possible transmitted LP-WUS, the network node transmits on-demand LP-SS in the on-demand LP-SS occasion of the j-th beam corresponding to the i-th time window. If there is no LO in all the LOs corresponding to the j-th beam that has a possible transmitted LP-WUS, the network node can not transmit on-demand LP-SS in the on-demand LP-SS occasion of the j-th beam corresponding to the i-th time window.

[0206] FIG. 13 is a schematic diagram of transmission of on-demand LP-SS in a multi-beam scenario according to an embodiment of the present application. For the same beam, if there is at least one LO that has a possible transmitted LP-WUS, for example, there is a LP-WUS to be transmitted in MO1 corresponding to beam 1 in LO1, the on-demand LP-SS of beam 1 is transmitted in the first transmission occasion of beam 1. There is no LP-WUS to be transmitted in the MOs corresponding to beam 2 in LO1 and LO2, so the on-demand LP-SS of beam 2 is not transmitted in the first transmission occasion of beam 2. FIG. 13 corresponds to FIG. 9 or FIG. 12. In FIG. 13, the first transmission occasion is according to T Ondemand and offset OFFSET OndemandDetermination, or according to the specific position of a set of time resources. FIG. 14 is a second sending schematic diagram of multi-beam on-demand LP-SS provided by the embodiment of the application, and FIG. 14 corresponds to FIG. 10. For the same beam, if at least one LO has a LP-WUS to be sent, for example, there is a LP-WUS to be sent in MO2 corresponding to beam 1 in LO1, the on-demand LP-SS of beam 1 is sent in the first transmission opportunity of beam 1 (identified as MO 0 in LO1 in the figure). There is a LP-WUS to be sent in the MO corresponding to beam 2 in LO2, the on-demand LP-SS of beam 2 is sent in the first transmission opportunity of beam 2 (identified as MO 1 in LO1 in the figure). MO0 and MO1 of LO1 are only used to send on-demand LP-SS, and do not send the load part of the LP-WUS. FIG. 15 is a third sending schematic diagram of multi-beam on-demand LP-SS provided by the embodiment of the application, and FIG. 15 corresponds to FIG. 11. For the same beam, if at least one LO has a LP-WUS to be sent, for example, there is a LP-WUS to be sent in MO2 corresponding to beam 1 in LO1, the on-demand LP-SS of beam 1 is sent in the first transmission opportunity of beam 1 (identified as MO 0 in LO1 in the figure). There is a LP-WUS to be sent in the MO corresponding to beam 2 in LO2, the on-demand LP-SS of beam 2 is sent in the first transmission opportunity of beam 2 (identified as MO 1 in LO1 in the figure).

[0207] The signal synchronization method provided by the embodiment of the application can provide better time synchronization, ensure the reception performance of the LP-WUS, and improve the resource utilization efficiency.

[0208] For the above-mentioned embodiments, the first signal and the third signal satisfy at least one of the following:

[0209] The duration of the transmission opportunity of the first signal is the same as the duration of the transmission opportunity of the third signal;

[0210] The duration of the transmission opportunity of the first signal is configured by the network and is the same as or different from the duration of the transmission opportunity of the third signal;

[0211] The sequence of the first signal is the same as the sequence of the third signal;

[0212] The sequence of the first signal is configured by the network and is the same as or different from the sequence of the third signal;

[0213] In the case where the transmission opportunities corresponding to the first signal and the third signal overlap, the network side device only sends one of the first signal and the third signal according to the priority of the first signal and the third signal.

[0214] The duration of an on-demand LP-SS occasion is the same as that of a P-LP-SS occasion, or the duration of an on-demand LP-SS occasion is configured by the network and may be the same as or different from that of a P-LP-SS occasion.

[0215] The sequence of the on-demand LP-SS is the same as that of the P-LP-SS, or the sequence of the on-demand LP-SS is configured by the network and may be the same as or different from that of the P-LP-SS.

[0216] If the on-demand LP-SS occasion overlaps with the resources of P-LP-SS, then only one signal is sent according to priority, for example, P-LP-SS is sent and on-demand LP-SS is not sent.

[0217] If the on-demand LP-SS occasion overlaps with the resources of LP-WUS, then only one signal is sent according to priority, for example, the on-demand LP-SS occasion is sent, but the LP-WUS is not sent.

[0218] In the above embodiments, UE measurements, such as those used to evaluate cell quality, can obtain measurement results based on P-LP-SS and / or On-demand LP-SS / preamble. According to one implementation, the UE performs measurements only based on periodic LP-SS, such as RRM measurements or serving cell quality measurements used to determine whether to exit LP-WUS reception. The UE does not perform measurements based on aperiodic LP-SS or preamble, thus avoiding UE misdetection of aperiodic synchronization signals (e.g., the network node did not send an aperiodic synchronization signal, but the UE assumed it did), affecting the measurement results. According to another implementation, the UE can perform measurements based on both periodic LP-SS and aperiodic synchronization signals. For example, the UE implementation can guarantee a low FAR, thereby reducing the impact of UE misdetection of aperiodic synchronization signals. Simultaneously, more measurement samples can be obtained using aperiodic synchronization signals, improving measurement accuracy, or the detection of periodic LP-SS can be reduced, saving power.

[0219] Figure 16 is a second schematic flowchart of the signal synchronization method provided in an embodiment of this application. As shown in Figure 16, the signal synchronization method includes:

[0220] Step 1610: If the first condition is met, the network-side device sends a first signal, which is used for synchronization;

[0221] The first condition at least comprises: at least one monitoring occasion of a second signal possibly requiring transmission in a set of time resources;

[0222] The first signal corresponds to a monitoring occasion of a specific signal in the set of time resources.

[0223] In some embodiments, the second signal is a low-power wake-up signal (LP-WUS) for waking up the terminal.

[0224] The network-side device can send the second signal at the MO or LO of the second signal.

[0225] The monitoring occasion of the specific signal in the set of time resources is a low-power wake-up signal monitoring occasion (MO) or a low-power wake-up signal occasion (LO).

[0226] The monitoring occasion of the specific signal in the set of time resources can be a low-power wake-up signal monitoring occasion (MO) or a low-power wake-up signal occasion (LO). The low-power wake-up signal can be an LP-WUS for waking up one terminal or multiple terminals.

[0227] It should be noted that when the network-side device decides whether to send the first signal, one possibility is that the network-side device has determined that there is an LP-WUS to be sent in the set of time resources. Another possibility is that the network-side device predicts that there may be an LP-WUS to be sent. However, if the network-side device prediction is not accurate, it is found that there is no LP-WUS to be sent, and thus the network-side device sends the first signal, but there is no LP-WUS to be sent subsequently. Therefore, at least one monitoring occasion of a second signal possibly requiring transmission in a set of time resources.

[0228] The signal synchronization method provided by the embodiments of the present application is executed by the network-side device, and belongs to the same inventive concept as the aforementioned terminal-side signal synchronization method. For understanding of the embodiments of the present application, reference can be made to the description of the aforementioned terminal-side signal synchronization method, and the same technical effects can be achieved, and thus will not be described herein again.

[0229] In some embodiments, the set of time resources is one of the following:

[0230] a) MOs or LOs of multiple second signals between adjacent transmission occasions of the first signals;

[0231] b) a time window of N first time lengths T1 or partial time resources in the time window, which is divided between adjacent third signals, the third signals being periodically sent synchronization signals.

[0232] In some embodiments, the first time length T1 satisfies one of the following:

[0233] T1 = T / N;

[0234] T1 = (T - T3) / N;

[0235] T1 is configured by the network;

[0236] wherein T is a period of the third signal, T3 is a time length of one of the third signal, and N is a number of time windows configured by the network or predefined by a protocol.

[0237] For example, the period of the third signal T = 320ms, N = 4, that is, it is divided into 4 segments connected in a loop, each segment is 80ms. Each segment is a group of time resources.

[0238] In some embodiments, the group of time resources is a group of monitoring occasions of a specific signal corresponding to the same reference point; at least one of the monitoring occasions of the specific signal is a monitoring occasion for transmitting the second signal.

[0239] It can be understood that the group of time resources is a group of MOs or LOs corresponding to the same reference point; at least one of the MOs or LOs is an MO or LO for transmitting the second signal.

[0240] For example, a plurality of MOs / LOs are predefined as a group of time resources, which share one preamble. The transmission occasion of this preamble is irrelevant to the interval of the periodic LP-SS.

[0241] In some embodiments, the same reference point is one of the following:

[0242] a paging occasion;

[0243] a paging frame;

[0244] a time slot, a subframe or a system frame in which the paging occasion is located.

[0245] In some embodiments, the first signal is a synchronization signal transmitted aperiodically.

[0246] In some embodiments, the first condition further includes one of the following:

[0247] a time interval between the transmission occasion of the first signal and the most recent third signal used for synchronization is greater than or equal to a first time threshold,

[0248] a time interval between the group of time resources and the most recent third signal used for synchronization is greater than or equal to a first time threshold;

[0249] The set of time resources is an i-th time window of N time windows between two adjacent third signals, or is located in the i-th time window, where i>1.

[0250] In some embodiments, the time resource of the first signal is a latest transmission occasion of the first signal before the second signal,

[0251] The transmission occasion of the first signal is determined according to at least one of the following manners:

[0252] The transmission occasion of the first signal is determined according to a period and an offset configured by a network.

[0253] The transmission occasion of the first signal is determined according to a time position of a latest third signal for synchronization before the second signal.

[0254] The transmission occasion of the first signal is a given time resource in the set of time resources.

[0255] In some embodiments, the position of the first time resource is determined according to a period of the third signal and a time resource of a third signal adjacent to a previous third signal of the second signal,

[0256] The time interval between the first time resource and the time resource of the third signal adjacent to the previous third signal of the second signal is T / N*i or T / N*i+offset, T is the period of the third signal, i is one of [1, 2, …, N-1], N is a positive integer, and offset is configured by a network or predefined by a protocol.

[0257] In some embodiments, the transmission occasion of the first signal is a given time resource in the set of time resources, including one of the following:

[0258] X1 OFDM symbols or OOK symbols starting from the beginning of the first Y monitoring occasions in the set of time resources are the transmission occasion of the first signal.

[0259] The beginning of the first monitoring occasion in the set of time resources is offset by X2 OFDM symbols or OOK symbols, or is offset by X3 ms or us in the past as the beginning, and a time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal.

[0260] The beginning of the set of time resources is offset by X4 OFDM symbols or OOK symbols in the future, or is offset by X5 ms or us in the future as the beginning, and a time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal.

[0261] The time resources with a length of X1 OFDM symbols or OOK symbols, which are offset by X6 OFDM symbols or OOK symbols or X6 ms or us from the start of the set of time resources as the start, are the transmission occasions of the first signal;

[0262] Y, X1, X2, X3, X4, X5, or X6 are pre-defined by a protocol or configured by a network.

[0263] In some embodiments, the X1 OFDM symbols or OOK symbols starting from the start of the first Y MOs or LOs in the set of time resources are the transmission occasions of the first signal, including:

[0264] The first Y monitoring occasions are only used for transmitting the first signal, and other monitoring occasions in the set of time resources can be used for transmitting the LP-WUS payload, where 1<=Y<=Z, and Z is the number of monitoring occasions included in the set of time resources.

[0265] Alternatively,

[0266] The first Y monitoring occasions can be used for transmitting the first signal and the LP-WUS payload.

[0267] In some embodiments, the time length of the first Y monitoring occasions is L+L1, and the time length of other monitoring occasions in the set of time resources is L, where L1 is the time length of the first signal, and L is the time length of the payload.

[0268] Alternatively,

[0269] The time length of each monitoring occasion in the set of time resources is the same.

[0270] In some embodiments, the set of time resources are the monitoring occasions of the second signal corresponding to the same spatial characteristic.

[0271] Optionally, the corresponding same spatial characteristic includes one of the following: corresponding to the same transmission beam, corresponding to the same QCL source, corresponding to the same SSB index, corresponding to the same LP-SS index, and corresponding to the same LP-SS beam.

[0272] In some embodiments, the network-side device transmits the first signal, and satisfies one of the following conditions:

[0273] The interval between the transmission occasion of the next first signal and the transmission occasion of the last one of the third signals used for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal.

[0274] whether a last MO or LO between a transmission occasion of the current first signal and a transmission occasion of a next first signal and a latest one of the second signals used for synchronization before the transmission occasion of the current first signal is greater than the first time threshold, and whether there is at least one second signal that can be transmitted between the transmission occasion of the current first signal and the transmission occasion of the next first signal.

[0275] In some embodiments, a starting position of the first time window is a starting position of a first one of the two adjacent third signals, or an ending position of the first one of the third signals, or a middle position of the first one of the third signals.

[0276] In some embodiments, the starting position of the transmission occasion of the first signal is one of:

[0277] a starting position of a time window corresponding to the first signal;

[0278] a sum of the starting position of the time window corresponding to the first signal and a first offset value;

[0279] a sum of a starting position of a first listening occasion in the time window corresponding to the first signal and a second offset value;

[0280] The first offset value can be a positive number or a negative number, and the second offset value is a negative number.

[0281] In some embodiments, the first signal and the third signal satisfy at least one of:

[0282] a duration of the transmission occasion of the first signal is the same as a duration of the transmission occasion of the third signal;

[0283] a duration of the transmission occasion of the first signal is configured by the network and is the same as or different from a duration of the transmission occasion of the third signal;

[0284] a sequence of the first signal is the same as a sequence of the third signal;

[0285] a sequence of the first signal is configured by the network and is the same as or different from a sequence of the third signal;

[0286] In a case where the transmission occasion of the first signal and the transmission occasion of the third signal overlap, the network-side device transmits only one of the first signal and the third signal according to priorities of the first signal and the third signal.

[0287] The signal synchronization method provided in the embodiments of the present application can be executed by a signal synchronization device. In the embodiments of the present application, the signal synchronization method is executed by a signal synchronization device, and the signal synchronization device provided in the embodiments of the present application is described.

[0288] Embodiments of the present application provide a signal synchronization apparatus. As an example, the signal synchronization apparatus can be a communication device or a component in a communication device, such as a chip. The communication device can be a terminal, a network-side device, a server, or the like. For example, the terminal can include, but is not limited to, the types of terminals 11 listed above, the network-side device can include, but is not limited to, the types of network-side devices 12 listed above, and embodiments of the present application do not make specific limitations.

[0289] The signal synchronization apparatus includes a receiving module, a sending module, and a processing module. The receiving module, the sending module, and the processing module can be implemented by software or by hardware. When implemented by hardware, the processing module can be implemented by a processor. For example, the processor can include a general-purpose processor, a special-purpose processor, or the like, such as a central processing unit (CPU), a microprocessor, a digital signal processor (DSP), an artificial intelligent (AI) processor, a graphics processing unit (GPU), an application specific integrated circuit (ASIC), a network processor (NP), a field programmable gate array (FPGA), or other programmable logic devices, gate circuits, transistors, discrete hardware components, or the like. The receiving module and the sending module can be implemented by a communication interface. The communication interface can include one or more of a transceiver, a pin, a circuit, a bus, a radio frequency unit, or the like.

[0290] Specifically, referring to FIG. 17, when the signal synchronization apparatus is a terminal or a component in a terminal, the signal synchronization apparatus 1700 includes a first processing module 1701 configured to assume that a first signal can be received in a first time resource under a first condition, the first signal being used for synchronization.

[0291] The first condition includes at least a listening occasion of a second signal in a set of time resources, the second signal being a signal that needs to be monitored by the terminal.

[0292] The first signal corresponds to a listening occasion of a specific signal in the set of time resources.

[0293] In some embodiments, the second signal is a low-power wake-up signal (LP-WUS) used to wake up the terminal, and the listening occasion of the second signal is determined according to a terminal-specific identifier.

[0294] The monitoring occasion of the specific signal in the set of time resources is a low-power wake-up signal monitoring occasion MO or a low-power wake-up signal occasion LO.

[0295] In some embodiments, the set of time resources is one of the following:

[0296] The monitoring occasion of a second signal corresponding to the same reference point that the terminal needs to monitor;

[0297] The time window of N first time lengths T1 or part of the time resources in the time window is divided between two adjacent third signals, and the third signal is a periodically transmitted synchronization signal.

[0298] In some embodiments, the first time length satisfies one of the following:

[0299] T1 = T / N;

[0300] T1 = (T-T3) / N;

[0301] T1 is configured by the network;

[0302] Wherein, T is the period of the third signal, T3 is the time length of one third signal, and N is the number of time windows configured by the network or predefined by the protocol.

[0303] In some embodiments, the set of time resources is a monitoring occasion of a specific signal corresponding to the same reference point; at least one monitoring occasion in the set of monitoring occasions of the specific signal is the MO or LO of the second signal.

[0304] In some embodiments, the same reference point is one of the following:

[0305] A paging occasion;

[0306] A paging frame;

[0307] A time slot, subframe, or system frame in which the paging occasion is located.

[0308] In some embodiments, the first signal is a non-periodically transmitted synchronization signal.

[0309] In some embodiments, the first condition further includes one of the following:

[0310] The time interval between the transmission occasion of the first signal and the most recent third signal used for synchronization is greater than or equal to a first time threshold,

[0311] The time interval between the set of time resources and the most recent third signal used for synchronization is greater than or equal to a first time threshold;

[0312] The set of time resources is an i-th time window of N time windows between two adjacent third signals, or is located in the i-th time window, where i>1.

[0313] In some embodiments, the first time resource is a latest transmission occasion of the first signal before the second signal,

[0314] The transmission occasion of the first signal is determined according to at least one of the following manners:

[0315] The transmission occasion of the first signal is determined according to a period and an offset configured by a network.

[0316] The transmission occasion of the first signal is determined according to a time position of a latest third signal for synchronization before the second signal.

[0317] The transmission occasion of the first signal is a given time resource in the set of time resources.

[0318] In some embodiments, a position of the first time resource is determined according to a period of the third signal and a time resource of a third signal adjacent to a previous one of the second signal,

[0319] The time interval between the first time resource and the time resource of the third signal adjacent to the previous one of the second signal is T / N*i or T / N*i+offset, T is the period of the third signal, i is one of [1, 2, …, N-1], N is a positive integer, and offset is predefined by a network or a protocol.

[0320] In some embodiments, the transmission occasion of the first signal is a given time resource in the set of time resources, including one of the following:

[0321] X1 OFDM symbols or OOK symbols starting from the beginning of the first Y monitoring occasions in the set of time resources are the transmission occasion of the first signal.

[0322] The beginning of the first monitoring occasion in the set of time resources is offset by X2 OFDM symbols or OOK symbols backward, or X3 ms or us backward, as the beginning, and a time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal.

[0323] The beginning of the set of time resources is offset by X4 OFDM symbols or OOK symbols backward, or X5 ms or us backward, as the beginning, and a time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal.

[0324] The time resources with a length of X1 OFDM symbols or OOK symbols, which are offset by X6 OFDM symbols or OOK symbols or X6 ms or us from the start of the set of time resources as the start, are the transmission occasions of the first signal;

[0325] Y, X1, X2, X3, X4, X5, or X6 are pre-defined by a protocol or configured by a network.

[0326] In some embodiments, the transmission occasions of the first signal are the X1 OFDM symbols or OOK symbols from the start of the first Y listening occasions in the set of time resources.

[0327] The first Y listening occasions are only used for transmitting the first signal, and other MOs or LOs in the set of time resources can be used for transmitting the LP-WUS payload, where 1 <= Y <= Z, and Z is the number of listening occasions included in the set of time resources; or, the first Y listening occasions can be used for transmitting the first signal and the LP-WUS payload.

[0328] In some embodiments, the time length of the first Y listening occasions is L+L1, and the time length of other listening occasions in the set of time resources is L, where L1 is the time length of the first signal, and L is the time length of the payload; or, the time length of each listening occasion in the set of time resources is the same.

[0329] In some embodiments, the terminal assumes that there is at least one first signal or third signal in a second time length before the listening occasion of the second signal.

[0330] In some embodiments, the set of time resources are listening occasions of the second signal corresponding to the same spatial characteristic.

[0331] In some embodiments, the corresponding to the same spatial characteristic includes one of the following: corresponding to the same transmission beam, corresponding to the same QCL source, corresponding to the same SSB index, corresponding to the same LP-SS index, and corresponding to the same LP-SS beam.

[0332] In some embodiments, the first signal is transmitted in the first time resource, and one of the following conditions is met:

[0333] The interval between the transmission occasion of the next first signal and the transmission occasion of the last one of the third signals used for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal;

[0334] the last listening occasion between the transmission occasion of the current first signal and the transmission occasion of the next first signal to the last listening occasion of the previous third signal for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal.

[0335] In some embodiments, the starting position of the first time window is the starting position of the first of the two adjacent third signals, or the ending position of the first third signal, or the middle position of the first third signal.

[0336] In some embodiments, the starting position of the transmission occasion of the first signal is one of:

[0337] the starting position of the time window corresponding to the first signal;

[0338] the sum of the starting position of the time window corresponding to the first signal and a first offset value;

[0339] the sum of the starting position of the first listening occasion in the time window corresponding to the first signal and a second offset value;

[0340] The first offset value can be positive or negative, and the second offset value is negative.

[0341] In some embodiments, the first signal and the third signal satisfy at least one of the following:

[0342] the duration of the transmission occasion of the first signal is the same as the duration of the transmission occasion of the third signal;

[0343] the duration of the transmission occasion of the first signal is configured by the network and is the same as or different from the duration of the transmission occasion of the third signal;

[0344] the sequence of the first signal is the same as the sequence of the third signal;

[0345] the sequence of the first signal is configured by the network and is the same as or different from the sequence of the third signal;

[0346] In the case of overlap between the transmission occasions corresponding to the first signal and the third signal, the network side device only transmits one of the first signal and the third signal according to the priority of the first signal and the third signal.

[0347] The signal synchronization apparatus provided by the embodiments of the present application can implement the various processes implemented by the method embodiments of FIGS. 2 to 15 and achieve the same technical effects. To avoid repetition, details are not repeated here.

[0348] Referring to FIG. 18, when the signal synchronization apparatus is a network-side device or a component in the network-side device, the signal synchronization apparatus 1800 includes a first sending module 1801 configured to send a first signal for synchronization when a first condition is met.

[0349] The first condition at least includes that there is at least one listening occasion of a second signal that can need to be transmitted in a set of time resources.

[0350] The first signal corresponds to a listening occasion of a specific signal in the set of time resources.

[0351] In some embodiments, the second signal is a low-power wake-up signal (LP-WUS) for waking up at least one terminal.

[0352] The network-side device can send the second signal at the listening occasion of the second signal.

[0353] The listening occasion of the specific signal in the set of time resources is a low-power wake-up signal listening occasion (MO) or a low-power wake-up signal occasion (LO).

[0354] In some embodiments, the set of time resources is one of the following:

[0355] A plurality of listening occasions of the second signal between transmission occasions of two adjacent first signals.

[0356] A time window of N first time lengths T1 split between two adjacent third signals or a part of time resources in the time window, the third signal being a periodically sent synchronization signal.

[0357] In some embodiments, the first time length satisfies one of the following:

[0358] T1 = T / N;

[0359] T1 = (T-T3) / N;

[0360] T1 is configured by a network.

[0361] wherein T is a period of the third signal, T3 is a time length of one third signal, and N is a number of time windows configured by the network or predefined by a protocol.

[0362] In some embodiments, the set of time resources is a set of listening occasions of specific signals corresponding to a same reference point; at least one listening occasion in the listening occasions of the specific signals is a listening occasion of sending the second signal.

[0363] In some embodiments, the same reference point is one of the following:

[0364] paging occasion;

[0365] paging frame;

[0366] a slot or a subframe or a system frame in which the paging occasion is located.

[0367] In some embodiments, the first signal is a synchronization signal sent aperiodically.

[0368] In some embodiments, the first condition further comprises one of:

[0369] a time interval between the transmission occasion of the first signal and a latest one of the third signals for synchronization is greater than or equal to a first time threshold,

[0370] a time interval between the set of time resources and a latest one of the third signals for synchronization is greater than or equal to a first time threshold;

[0371] the set of time resources is an i-th time window of N time windows between two adjacent third signals, or is located in the i-th time window, where i>1.

[0372] In some embodiments, the time resource of the first signal is a latest transmission occasion of the first signal before the second signal,

[0373] wherein the transmission occasion of the first signal is determined according to at least one of:

[0374] the transmission occasion of the first signal is determined according to a period and an offset configured by a network;

[0375] the transmission occasion of the first signal is determined according to a time position of a latest one of the third signals for synchronization before the second signal;

[0376] the transmission occasion of the first signal is a given time resource in the set of time resources.

[0377] In some embodiments, a position of the first time resource is determined according to a period of the third signal and a time resource of a third signal adjacent to the second signal,

[0378] wherein a time interval between the first time resource and the time resource of the third signal adjacent to the second signal is T / N*i or T / N*i+offset, T is the period of the third signal, i takes one of [1, 2, …, N-1], N is a positive integer, and offset is predefined by a network configuration or a protocol.

[0379] In some embodiments, the transmission occasion of the first signal is a given time resource in the set of time resources, including one of:

[0380] The X1 OFDM symbols or OOK symbols starting from the beginning of the first Y monitoring occasions in the set of time resources is the transmission occasion of the first signal;

[0381] The time resource with length of X1 OFDM symbols or OOK symbols starting from the beginning of the first monitoring occasion in the set of time resources is the transmission occasion of the first signal, where the beginning of the first monitoring occasion is offset by X2 OFDM symbols or OOK symbols, or X3 ms or us in the past;

[0382] The time resource with length of X1 OFDM symbols or OOK symbols starting from the beginning of the first monitoring occasion in the set of time resources is the transmission occasion of the first signal, where the beginning of the first monitoring occasion is offset by X4 OFDM symbols or OOK symbols, or X5 ms or us in the future;

[0383] The time resource with length of X1 OFDM symbols or OOK symbols starting from the beginning of the first monitoring occasion in the set of time resources is the transmission occasion of the first signal, where the beginning of the first monitoring occasion is offset by X6 OFDM symbols or OOK symbols, or X6 ms or us in the past;

[0384] Wherein Y, X1, X2, X3, X4, X5 or X6 is protocol predefined or network configured.

[0385] In some embodiments, the transmission occasion of the first signal is X1 OFDM symbols or OOK symbols starting from the beginning of the first Y MOs or LOs in the set of time resources, including one of:

[0386] The first Y monitoring occasions are only used for transmitting the first signal, and other monitoring occasions in the set of time resources can be used for transmitting the LP-WUS payload, where 1 <= Y <= Z, Z is the number of monitoring occasions included in the set of time resources;

[0387] Or,

[0388] The first Y monitoring occasions can be used for transmitting the first signal, and can also be used for transmitting the LP-WUS payload.

[0389] In some embodiments, the time length of the first Y monitoring occasions is L+L1, and the time length of other monitoring occasions in the set of time resources is L, where L1 is the time length of the first signal, and L is the time length of the payload;

[0390] Or,

[0391] The time length of each listening occasion in the set of time resources is the same.

[0392] In some embodiments, the set of time resources is a listening occasion of the second signal corresponding to a same spatial characteristic.

[0393] In some embodiments, the corresponding to a same spatial characteristic comprises one of the following: corresponding to a same transmission beam, corresponding to a same QCL source, corresponding to a same SSB index, corresponding to a same LP-SS index, corresponding to a same LP-SS beam.

[0394] In some embodiments, the network-side device transmits the first signal, and one of the following conditions is met:

[0395] The interval between the transmission occasion of the next first signal and the transmission occasion of the last one of the third signals used for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal;

[0396] The interval between the last listening occasion between the transmission occasion of the current first signal and the transmission occasion of the next first signal and the last one of the third signals used for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal.

[0397] In some embodiments, the starting position of the first time window is one of the following: the starting position of the first one of the adjacent two third signals, the ending position of the first one of the third signals, or the middle position of the first one of the third signals.

[0398] In some embodiments, the starting position of the transmission occasion of the first signal is one of the following:

[0399] The starting position of the time window corresponding to the first signal;

[0400] The sum of the starting position of the time window corresponding to the first signal and a first offset value;

[0401] The sum of the starting position of the first listening occasion in the time window corresponding to the first signal and a second offset value;

[0402] The first offset value can be a positive number or a negative number, and the second offset value is a negative number.

[0403] In some embodiments, the first signal and the third signal meet at least one of the following:

[0404] The duration of the transmission occasion of the first signal is the same as the duration of the transmission occasion of the third signal.

[0405] The duration of the transmission occasion of the first signal is configured by the network, and is the same as or different from the duration of the transmission occasion of the third signal.

[0406] The sequence of the first signal is the same as the sequence of the third signal.

[0407] The sequence of the first signal is configured by the network, and is the same as or different from the sequence of the third signal.

[0408] In a case where the transmission occasions corresponding to the first signal and the third signal overlap, the network-side device transmits only one of the first signal and the third signal according to the priorities of the first signal and the third signal.

[0409] The signal synchronization apparatus provided in the embodiments of the present application can implement each process implemented by the method embodiment of FIG. 16 and achieve the same technical effects. To avoid repetition, details are not described herein.

[0410] As shown in FIG. 19, the embodiments of the present application further provide a communication device 1900, which includes a processor 1901 and a memory 1902, and the memory 1902 stores programs or instructions executable on the processor 1901. For example, when the communication device 1900 is a terminal, the programs or instructions are executed by the processor 1901 to implement each step of the above signal synchronization method embodiments and achieve the same technical effects. When the communication device 1900 is a network-side device, the programs or instructions are executed by the processor 1901 to implement each step of the above signal synchronization method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0411] The embodiments of the present application further provide a terminal, which includes a processor and a communication interface, the communication interface is coupled to the processor, and the processor is configured to run programs or instructions to implement the steps in the method embodiment shown in FIG. 2. The terminal embodiment corresponds to the above terminal-side method embodiment, and each implementation process and implementation manner of the above method embodiment can be applied to the terminal embodiment and achieve the same technical effects. The terminal can be the signal synchronization apparatus shown in FIG. 17. Specifically, FIG. 20 is a hardware structure diagram of a terminal according to an embodiment of the present application.

[0412] The terminal 2000 includes, but is not limited to, at least part of the following components: a radio frequency unit 2001, a network module 2002, an audio output unit 2003, an input unit 2004, a sensor 2005, a display unit 2006, a user input unit 2007, an interface unit 2008, a memory 2009, and a processor 2010, etc.

[0413] Those skilled in the art can understand that the terminal 2000 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected to the processor 2010 through a power management system, so that the power management system can realize the functions of managing charging, discharging, and power consumption management. The terminal structure shown in FIG. 20 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than those shown, or combine certain components, or different component arrangements, which will not be described here.

[0414] It should be understood that in the embodiments of the present application, the input unit 2004 can include a graphics processor 20041 and a microphone 20042. The graphics processor 20041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 2006 can include a display panel 20061, which can be configured in the form of a liquid crystal display, an organic light-emitting diode, etc. The user input unit 2007 includes at least one of a touch panel 20071 and other input devices 20072. The touch panel 20071 is also called a touch screen. The touch panel 20071 can include two parts of a touch detection device and a touch controller. The other input devices 20072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), trackballs, mice, joysticks, which will not be described here.

[0415] In the embodiments of the present application, after the radio frequency unit 2001 receives the downlink data from the network side device, it can be transmitted to the processor 2010 for processing. In addition, the radio frequency unit 2001 can send uplink data to the network side device. Generally, the radio frequency unit 2001 includes, but is not limited to, an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0416] The memory 2009 can be used to store software programs or instructions and various data. The memory 2009 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, application programs or instructions required by at least one function (such as a sound playing function, an image playing function, etc.), and the like. In addition, the memory 2009 can include a volatile memory or a non-volatile memory. The non-volatile memory can be a Read-Only Memory (ROM), a Programmable ROM (PROM), an Erasable PROM (EPROM), an Electrically EPROM (EEPROM), or a flash memory. The volatile memory can be a Random Access Memory (RAM), a Static RAM (SRAM), a Dynamic RAM (DRAM), a Synchronous DRAM (SDRAM), a Double Data Rate SDRAM (DDR SDRAM), an Enhanced SDRAM (ESDRAM), a Synch link DRAM (SLDRAM), and a Direct Rambus RAM (DRRAM). The memory 2009 in the embodiments of the present application includes but is not limited to these and any other suitable types of memory.

[0417] The processor 2010 can include one or more processing units; optionally, the processor 2010 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 2010.

[0418] The processor 2010 is configured to, in a case where a first condition is met, assume that a first signal can be received in a first time resource, the first signal being used for synchronization.

[0419] The first condition at least includes a listening opportunity of at least one second signal in a set of time resources, the second signal being a signal required to be monitored by the terminal.

[0420] The first signal corresponds to a monitoring occasion of a specific signal in the set of time resources.

[0421] It can be understood that the implementation process of each implementation manner mentioned in the embodiment can refer to the related description of the signal synchronization method embodiment, and achieve the same or corresponding technical effects. To avoid repetition, it will not be described here.

[0422] The embodiment of the application further provides a network side device, comprising a processor and a communication interface, the communication interface and the processor are coupled, the processor is used for running programs or instructions, and the steps of the method embodiment shown in FIG. 16 are realized. The network side device embodiment corresponds to the network side device method embodiment described above. Each implementation process and implementation manner of the above method embodiment can be applied to the network side device embodiment, and the same technical effects can be achieved.

[0423] Specifically, the embodiment of the application further provides a network side device, which can be a signal synchronization apparatus shown in FIG. 18. As shown in FIG. 21, the network side device 2100 comprises an antenna 2101, a radio frequency device 2102, a baseband device 2103, a processor 2104 and a memory 2105. The antenna 2101 is connected with the radio frequency device 2102. In the uplink direction, the radio frequency device 2102 receives information through the antenna 2101, and sends the received information to the baseband device 2103 for processing. In the downlink direction, the baseband device 2103 processes the information to be sent, and sends it to the radio frequency device 2102. The radio frequency device 2102 processes the received information and sends it out through the antenna 2101.

[0424] The method performed by the network side device in the above embodiment can be implemented in the baseband device 2103, which comprises a baseband processor.

[0425] The baseband device 2103 may, for example, comprise at least one baseband board, which is provided with a plurality of chips, as shown in FIG. 21. One of the chips is, for example, a baseband processor, which is connected with the memory 2105 through a bus interface to call the programs in the memory 2105 and execute the network device operations shown in the above method embodiment.

[0426] The network side device may, for example, further comprise a network interface 2106, which is, for example, a common public radio interface (Common Public Radio Interface, CPRI).

[0427] Specifically, the network side device 21000 in the embodiments of the present application further includes instructions or programs stored in the storage 2105 and executable on the processor 2104, the processor 2104 invokes the instructions or programs in the storage 2105 to perform the method executed by each module shown in FIG. 18, and achieves the same technical effects. To avoid repetition, details are not described herein.

[0428] The embodiments of the present application further provide a readable storage medium, which stores programs or instructions, and the programs or instructions are executed by a processor to implement each process of the above-mentioned signal synchronization method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0429] The processor is the processor in the terminal in the above-mentioned embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. In some examples, the readable storage medium can be a non-transitory readable storage medium.

[0430] The embodiments of the present application further provide a chip, which includes a processor and a communication interface, the communication interface is coupled with the processor, and the processor is used to run programs or instructions to implement each process of the above-mentioned signal synchronization method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0431] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system chip, a system chip, a chip system or a system on chip, etc.

[0432] The embodiments of the present application further provide a computer program / program product, which is stored in a storage medium, and is executed by at least one processor to implement each process of the above-mentioned signal synchronization method embodiments and achieve the same technical effects. To avoid repetition, details are not described herein.

[0433] The embodiments of the present application further provide a communication system, which includes a terminal and a network side device, the terminal can be used to execute the steps of the above-mentioned signal synchronization method, and the network side device can be used to execute the steps of the above-mentioned signal synchronization method.

[0434] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the methods and apparatuses of the present application can be carried out by specific hardware, software, or a combination thereof, and that the scope of the application is not limited to the specific order of execution of the steps described in the examples. In addition, features described in relation to certain examples can be combined in other examples.

[0435] From the above description of the embodiments, it is clear that the above-mentioned method can be realized by means of a computer software product and a general hardware platform, of course, it can also be realized by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disc, optical disc, etc.), and includes a plurality of instructions for making the terminal or network side device execute the method described in each embodiment of the present application.

[0436] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above-mentioned specific embodiments, the above-mentioned specific embodiments are only illustrative, not restrictive, and those skilled in the art can make many forms of embodiments under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A method for signal synchronization, comprising: assuming, by a terminal, that a first signal is receivable in a first time resource for synchronization, if a first condition is satisfied, wherein the first signal is used for synchronization; the first condition comprises at least a monitoring occasion of a second signal in a set of time resources, wherein the second signal is a signal to be monitored by the terminal; the first signal corresponds to a monitoring occasion of a specific signal in the set of time resources.

2. The signal synchronization method of claim 1, wherein, the second signal is a low power wake-up signal (LP-WUS) used for waking up the terminal, and the monitoring occasion of the second signal is determined according to a terminal-specific identity; the monitoring occasion of the specific signal in the set of time resources is a low power wake-up signal monitoring occasion (MO) or a low power wake-up signal occasion (LO).

3. The signal synchronization method according to claim 1 or 2, wherein, the set of time resources is one of: monitoring occasions of a set of second signals corresponding to a same reference point, which are to be monitored by the terminal; a time window of N first time lengths T1 split between two adjacent third signals, or a partial time resource in the time window, wherein the third signals are periodically transmitted synchronization signals.

4. The signal synchronization method of claim 3, wherein, the first time length T1 satisfies one of: T1 = T / N; T1 = (T-T3) / N; T1 is configured by a network; wherein T is a period of the third signals, T3 is a time length of one of the third signals, and N is a number of time windows configured by the network or predefined by a protocol.

5. The signal synchronization method according to claim 1 or 2, wherein, the set of time resources is a set of monitoring occasions of specific signals corresponding to a same reference point, and at least one of the monitoring occasions of the specific signals is a monitoring occasion of the second signal.

6. The signal synchronization method according to claim 3 or 5, wherein, the same reference point is one of: a paging occasion; a paging frame; a time slot, a subframe, or a system frame in which the paging occasion is located.

7. The signal synchronization method according to any one of claims 1 to 6, wherein, the first signal is a synchronization signal that is not periodically transmitted.

8. The signal synchronization method according to any one of claims 1 to 7, wherein, the first condition further comprises one of: a time interval between a transmission occasion of the first signal and a latest third signal for synchronization is greater than or equal to a first time threshold; a time interval between the set of time resources and the latest third signal for synchronization is greater than or equal to the first time threshold; the set of time resources is an i-th time window of N time windows between two adjacent third signals, or is located in the i-th time window, wherein i > 1.

9. The signal synchronization method according to any one of claims 1 to 8, wherein, the first time resource is a latest transmission occasion of the first signal before the second signal, wherein the transmission occasion of the first signal is determined according to at least one of: the transmission occasion of the first signal is determined according to a period and an offset configured by a network; the transmission occasion of the first signal is determined according to a time position of the latest third signal for synchronization before the second signal; the transmission occasion of the first signal is a given time resource in the set of time resources.

10. The signal synchronization method of claim 9, wherein, a position of the first time resource is determined according to a period of the third signals and a time resource of a third signal adjacent to a previous one of the third signals before the second signal, The time interval between the first time resource and the time resource of a third signal adjacent to the second signal is T / N*i or T / N*i+offset, T is a period of the third signal, i is one of [1, 2, …, N-1], N is a positive integer, and offset is configured by a network or predefined by a protocol.

11. The signal synchronization method of claim 9, wherein, The transmission occasion of the first signal is a given time resource in the group of time resources, including one of the following: X1 OFDM symbols or OOK symbols starting from the beginning of the first Y monitoring occasions in the group of time resources are the transmission occasion of the first signal; The beginning of the first monitoring occasion in the group of time resources is offset by X2 OFDM symbols or OOK symbols, or X3 ms or us in the past, and the time resource with a length of X1 OFDM symbols or OOK symbols starting from the beginning is the transmission occasion of the first signal; X4 OFDM symbols or OOK symbols are offset backward from the beginning of the group of time resources, or X5 ms or us are offset backward, and the time resource with a length of X1 OFDM symbols or OOK symbols starting from the beginning is the transmission occasion of the first signal; X6 OFDM symbols or OOK symbols are offset forward from the beginning of the group of time resources, or X6 ms or us are offset forward, and the time resource with a length of X1 OFDM symbols or OOK symbols starting from the beginning is the transmission occasion of the first signal; Wherein, Y, X1, X2, X3, X4, X5 or X6 is predefined by a protocol or configured by a network.

12. The signal synchronization method of claim 11, wherein, X1 OFDM symbols or OOK symbols starting from the beginning of the first Y monitoring occasions in the group of time resources are the transmission occasion of the first signal, including: The first Y monitoring occasions are only used for sending the first signal, and other monitoring occasions in the group of time resources can be used for sending an LP-WUS payload, wherein 1<=Y<=Z, Z is the number of monitoring occasions included in the group of time resources; Or, The first Y monitoring occasions can be used for sending the first signal and also can be used for sending an LP-WUS payload.

13. The signal synchronization method according to claim 11 or 12, wherein, The time length of the first Y monitoring occasions is L+L1, and the time length of other monitoring occasions in the group of time resources is L, wherein L1 is the time length of the first signal, and L is the time length of the payload; Or, The time length of each monitoring occasion in the group of time resources is the same.

14. The signal synchronization method according to any one of claims 1 to 13, wherein, The terminal assumes that there is at least one first signal or third signal in a second time length before the monitoring occasion of the second signal.

15. The signal synchronization method according to any one of claims 1 to 14, wherein, The group of time resources is the monitoring occasion of the second signal corresponding to the same spatial characteristic.

16. The signal synchronization method of claim 15, wherein, The corresponding to the same spatial characteristic includes one of the following: corresponding to the same transmission beam, corresponding to the same QCL source, corresponding to the same SSB index, corresponding to the same LP-SS index, and corresponding to the same LP-SS beam.

17. The signal synchronization method of claim 8, wherein, The first signal is sent in the first time resource, satisfying one of the following conditions: The interval between the transmission occasion of the next first signal and the transmission occasion of the last third signal for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal; The interval between the last monitoring occasion between the transmission occasion of the current first signal and the transmission occasion of the next first signal and the last third signal for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal.

18. The signal synchronization method of claim 3, wherein, The starting position of the first time window is the starting position of the first third signal of the two adjacent third signals, or the ending position of the first third signal, or the middle position of the first third signal.

19. The signal synchronization method of claim 3, wherein, The starting position of the transmission occasion of the first signal is one of the following: The starting position of the time window corresponding to the first signal; The sum of the starting position of the time window corresponding to the first signal and a first offset value; The sum of the starting position of the first monitoring occasion in the time window corresponding to the first signal and a second offset value; The first offset value can be positive or negative, and the second offset value is negative.

20. The signal synchronization method according to any one of claims 1 to 19, wherein, The first signal and the third signal satisfy at least one of the following: The duration of the transmission occasion of the first signal is the same as the duration of the transmission occasion of the third signal; The duration of the transmission occasion of the first signal is configured by the network and is the same as or different from the duration of the transmission occasion of the third signal; The sequence of the first signal is the same as the sequence of the third signal; The sequence of the first signal is configured by the network and is the same as or different from the sequence of the third signal; In the case of overlap between the transmission occasions of the first signal and the third signal, the network side device only transmits one of the first signal and the third signal according to the priority of the first signal and the third signal.

21. A signal synchronization method, comprising: In the case of satisfying a first condition, a network side device transmits a first signal, the first signal being used for synchronization; The first condition at least includes that there is at least one monitoring occasion of a second signal that may need to be transmitted in a set of time resources; The first signal corresponds to the monitoring occasion of a specific signal in the set of time resources.

22. The signal synchronization method of claim 21, wherein, The second signal is a low-power wake-up signal (LP-WUS) used to wake up at least one terminal; The network side device can transmit the second signal at the monitoring occasion of the second signal; The monitoring occasion of the specific signal in the set of time resources is a low-power wake-up signal monitoring occasion (MO) or a low-power wake-up signal occasion (LO).

23. The signal synchronization method according to claim 21 or 22, wherein, The set of time resources is one of the following: A plurality of monitoring occasions of the second signal between the transmission occasions of the two adjacent first signals; A time window of N first time lengths T1 or a part of the time resource in the time window divided between the two adjacent third signals, the third signal being a periodically transmitted synchronization signal.

24. The signal synchronization method of claim 23, wherein, The first time length satisfies one of the following: T1=T / N; T1=(T-T3) / N; T1 is configured by the network; wherein T is a period of the third signal, T3 is a time length of one of the third signal, and N is a number of time windows configured by the network or predefined by the protocol.

25. The signal synchronization method of claim 21, wherein, The set of time resources are monitoring occasions of a specific signal corresponding to the same reference point; at least one of the monitoring occasions of the specific signal is a monitoring occasion in which the second signal is transmitted.

26. The signal synchronization method according to claim 23 or 25, wherein, The same reference point is one of: a paging occasion; a paging frame; a time slot or a subframe or a system frame in which the paging occasion is located.

27. The signal synchronization method according to any one of claims 21 to 26, wherein, The first signal is a synchronization signal transmitted aperiodically.

28. The signal synchronization method according to any one of claims 21 to 27, wherein, The first condition further comprises one of: a time interval between the transmission occasion of the first signal and a latest third signal used for synchronization is greater than or equal to a first time threshold; a time interval between the set of time resources and a latest third signal used for synchronization is greater than or equal to a first time threshold; The set of time resources is an i-th time window of N time windows between two adjacent third signals, or is located in the i-th time window, where i > 1.

29. The signal synchronization method according to any one of claims 21 to 28, wherein, The time resource of the first signal is a latest transmission occasion of the first signal before the second signal, wherein the transmission occasion of the first signal is determined according to at least one of: the transmission occasion of the first signal is determined according to a period and an offset configured by the network; the transmission occasion of the first signal is determined according to a time position of a latest third signal used for synchronization before the second signal; the transmission occasion of the first signal is a given time resource in the set of time resources.

30. The signal synchronization method of claim 29, wherein, The position of the first time resource is determined according to a period of the third signal and a time resource of a third signal adjacent to a previous third signal of the second signal, wherein a time interval between the first time resource and the time resource of the third signal adjacent to the previous third signal of the second signal is T / N*i or T / N*i+offset, T is a period of the third signal, i takes one of [1, 2, …, N-1], N is a positive integer, and offset is configured by the network or predefined by the protocol.

31. The signal synchronization method of claim 29, wherein, The transmission occasion of the first signal is a given time resource in the set of time resources, comprising one of: X1 OFDM symbols or OOK symbols starting from a start point of the first Y monitoring occasions in the set of time resources are the transmission occasion of the first signal; a start point of a first monitoring occasion in the set of time resources is offset by X2 OFDM symbols or OOK symbols backward or X3 ms or us backward as a start point, and a time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal; a start point of the set of time resources is offset by X4 OFDM symbols or OOK symbols backward or X5 ms or us backward as a start point, and a time resource with a length of X1 OFDM symbols or OOK symbols is the transmission occasion of the first signal; The time resource with a length of X1 OFDM symbols or OOK symbols, which is shifted forward by X6 OFDM symbols or OOK symbols or X6 ms or us from the start of the set of time resources, is a transmission occasion of the first signal; wherein Y, X1, X2, X3, X4, X5 or X6 are pre-defined by a protocol or configured by a network.

32. The signal synchronization method of claim 31, wherein, The X1 OFDM symbols or OOK symbols starting from the start of the first Y listening occasions in the set of time resources are a transmission occasion of the first signal, comprising: The first Y listening occasions are only used for transmitting the first signal, and other listening occasions in the set of time resources can be used for transmitting a LP-WUS payload, wherein 1<=Y<=Z, and Z is a number of listening occasions included in the set of time resources. Alternatively, The first Y listening occasions can be used for transmitting the first signal and can also be used for transmitting a LP-WUS payload.

33. The signal synchronization method of claim 31 or 32, wherein, The time length of the first Y listening occasions is L+L1, and the time length of other listening occasions in the set of time resources is L, wherein L1 is a time length of the first signal, and L is a time length of a payload. Alternatively, The time length of each listening occasion in the set of time resources is the same.

34. The signal synchronization method according to any one of claims 21 to 33, wherein, The set of time resources is a listening occasion of a second signal corresponding to a same spatial characteristic.

35. The signal synchronization method of claim 34, wherein, The corresponding to a same spatial characteristic comprises one of the following: corresponding to a same transmission beam, corresponding to a same QCL source, corresponding to a same SSB index, corresponding to a same LP-SS index, and corresponding to a same LP-SS beam.

36. The signal synchronization method of claim 28, wherein, The network-side device transmits the first signal, and satisfies one of the following conditions: The interval between a transmission occasion of a next first signal and a transmission occasion of a last third signal used for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal; Whether the interval between a last listening occasion between a transmission occasion of a current first signal and a transmission occasion of a next first signal and a last third signal used for synchronization is greater than the first time threshold, and there is at least one possible second signal between the transmission occasion of the current first signal and the transmission occasion of the next first signal.

37. The signal synchronization method of claim 23, wherein, The start position of the first time window is one of the following:

38. The signal synchronization method of claim 23, wherein, The start position of the first signal corresponding to the time window; The sum of the start position of the first signal corresponding to the time window and a first offset value; The sum of the start position of the first listening occasion in the time window corresponding to the first signal and a second offset value; The first offset value can be a positive number or a negative number, and the second offset value is a negative number. The first signal and the third signal satisfy at least one of the following:

39. The signal synchronization method of any one of claims 21 to 38, wherein, The duration of the transmission occasion of the first signal is the same as the duration of the transmission occasion of the third signal; ​ A duration of a transmission occasion of the first signal is configured by the network, and is the same as or different from a duration of a transmission occasion of the third signal. A sequence of the first signal is the same as a sequence of the third signal. A sequence of the first signal is configured by the network, and is the same as or different from a sequence of the third signal. In a case where transmission occasions corresponding to the first signal and the third signal overlap, the network-side device transmits only one of the first signal and the third signal according to priorities of the first signal and the third signal.

40. A signal synchronization apparatus, comprising: a first processing module configured to assume that a first signal can be received in a first time resource in a case where a first condition is satisfied, the first signal being used for synchronization; the first condition at least including a listening occasion of at least one second signal in a set of time resources, the second signal being a signal that needs to be monitored by the terminal; the first signal corresponding to a listening occasion of a specific signal in the set of time resources.

41. A signal synchronization apparatus, comprising: a first sending module configured to send a first signal in a case where a first condition is satisfied, the first signal being used for synchronization; the first condition at least including a listening occasion of at least one second signal that can need to be transmitted in a set of time resources; the first signal corresponding to a listening occasion of a specific signal in the set of time resources.

42. A terminal, comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement steps of the signal synchronization method according to any one of claims 1 to 20.

43. A network-side device, comprising a processor and a memory, the memory storing programs or instructions executable on the processor, the programs or instructions being executed by the processor to implement steps of the signal synchronization method according to any one of claims 21 to 39.

44. A readable storage medium, the readable storage medium storing programs or instructions, the programs or instructions being executed by a processor to implement the signal synchronization method according to any one of claims 1 to 20, or to implement steps of the signal synchronization method according to any one of claims 21 to 39.

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