Synchronization signal transmission method, network device, user equipment and communication system

Abstract

A synchronization signal transmission method, a network device, a user equipment (UE) and a communication system. The synchronization signal transmission method comprises: a network device sending a synchronization signal (SS) and a physical broadcast channel (PBCH), wherein the SS and the PBCH each comprise index information, and the index information comprises a synchronization signal block (SSB) index and / or an SSB burst set index. When forming a cell group from a plurality of cells (or base stations), a network device performs inter-coordination to send an SS. After receiving the SS and a PBCH, a UE determines, on the basis of an SSB index and / or an SSB burst set index, related information used for performing downlink time and frequency synchronization, so as to further optimize a downlink synchronization process of a 5G NR system.

Description

Synchronization signal transmission methods, network equipment, user equipment, and communication systems Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a method for transmitting synchronous signals, a network device, a user equipment, and a communication system. Background Technology

[0002] In 5G systems, the downlink synchronization process mainly includes steps such as Primary Synchronization Signal (PSS) detection, Secondary Synchronization Signal (SSS) detection, and Physical Broadcast Channel (PBCH) parsing. The downlink synchronization process is crucial for ensuring data transmission reliability and system performance stability in the entire 5G system. Therefore, it is necessary to further improve the downlink synchronization process to meet data transmission requirements.

[0003] Summary of the Invention

[0004] This disclosure provides a synchronization signal transmission method, network device, user equipment, and communication system to further improve the downlink synchronization process of the 5G NR system.

[0005] On one hand, embodiments of this disclosure provide a synchronization signal transmission method, the method comprising:

[0006] Network devices send synchronization signals (SS) and physical broadcast channels (PBCH);

[0007] The SS and PBCH include index information;

[0008] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0009] On the other hand, embodiments of this disclosure also provide a synchronization signal transmission method, the method comprising:

[0010] User equipment (UE) receives SS and PBCH sent by network equipment;

[0011] The SS and PBCH include index information;

[0012] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0013] On the other hand, embodiments of this disclosure also provide a network device, the network device comprising:

[0014] The sending module is used to send SS and PBCH.

[0015] The SS and PBCH include index information;

[0016] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0017] On the other hand, embodiments of this disclosure also provide a user equipment, the user equipment comprising:

[0018] The receiving module is used to receive SS and PBCH signals sent by network devices.

[0019] The SS and PBCH include index information;

[0020] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0021] On the other hand, embodiments of this disclosure also provide a network device, including:

[0022] One or more processors;

[0023] The network device is used to execute the synchronization signal transmission method described in the embodiments of this disclosure.

[0024] On the other hand, embodiments of this disclosure also provide a user equipment, including:

[0025] One or more processors;

[0026] The user equipment is used to execute the synchronization signal transmission method described in the embodiments of this disclosure.

[0027] This disclosure also provides a communication system, including a network device and a user equipment; wherein the network device is configured to implement the synchronization signal transmission method described in this disclosure, and the user equipment is configured to implement the synchronization signal transmission method described in this disclosure.

[0028] This disclosure also provides a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the synchronization signal transmission method as described in this disclosure.

[0029] In this embodiment of the disclosure, the process of the network device sending SS and PBCH is implemented. After the UE receives the SS and PBCH, it determines the relevant information for downlink time and frequency synchronization based on the SSB index and / or SSB burst set index, so as to further improve the downlink synchronization process of the 5G NR system.

[0030] Additional aspects and advantages of embodiments of this disclosure will be set forth in part in the description which follows, and will become apparent from the description or may be learned by practice of this disclosure. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings required for the description of the embodiments are introduced below. The following drawings are only some embodiments of this disclosure and do not impose specific limitations on the protection scope of this disclosure.

[0032] Figure 1 is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure;

[0033] Figure 2 is one of the interactive schematic diagrams of the method provided according to an embodiment of the present disclosure;

[0034] Figure 3 is a schematic diagram of one of the examples provided in the embodiments of this disclosure;

[0035] Figure 4 is a second schematic diagram of an example provided in the embodiments of this disclosure;

[0036] Figure 5 is a schematic diagram of the third example provided in the embodiments of this disclosure;

[0037] Figure 6 is a schematic diagram of the fourth example provided in the embodiments of this disclosure;

[0038] Figure 7 is a second interactive schematic diagram of the method provided according to an embodiment of the present disclosure;

[0039] Figure 8 is a third interactive schematic diagram of the method provided according to an embodiment of the present disclosure;

[0040] Figure 9 is a fourth interactive schematic diagram of the method provided according to an embodiment of the present disclosure;

[0041] Figure 10 is a fifth schematic diagram of an example provided in the embodiments of this disclosure;

[0042] Figure 11 is a fifth interactive schematic diagram of the method provided according to an embodiment of the present disclosure;

[0043] Figure 12 is a schematic diagram of the sixth example provided in the embodiments of this disclosure;

[0044] Figure 13 is a sixth interactive schematic diagram of the method provided according to an embodiment of the present disclosure;

[0045] Figure 14 is a schematic diagram of the seventh example provided in the embodiments of this disclosure;

[0046] Figure 15 is a schematic flowchart of one of the synchronization signal transmission methods provided in the embodiments of this disclosure;

[0047] Figure 16 is a second schematic flowchart of the synchronization signal transmission method provided in the embodiments of this disclosure;

[0048] Figure 17 is a schematic diagram of the structure of the network device proposed in an embodiment of this disclosure;

[0049] Figure 18 is a schematic diagram of the structure of the user equipment proposed in an embodiment of this disclosure;

[0050] Figure 19 is a schematic diagram of the structure of the terminal proposed in the embodiment of this disclosure;

[0051] Figure 20 is a schematic diagram of the chip structure proposed in the embodiments of this disclosure. Detailed Implementation

[0052] This disclosure presents a method for transmitting synchronous signals, a network device, a user device, and a communication system.

[0053] In a first aspect, embodiments of this disclosure provide a method for transmitting a synchronization signal, the method comprising:

[0054] Network devices send synchronization signals (SS) and physical broadcast channels (PBCH);

[0055] The SS and PBCH include index information;

[0056] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0057] In the above embodiments, the process of the network device sending SS and PBCH is implemented. After the UE receives the SS and PBCH, it determines the relevant information for downlink time and frequency synchronization based on the SSB index and / or SSB burst set index, so as to further improve the downlink synchronization process of the 5G NR system.

[0058] In conjunction with some embodiments of the first aspect, in some embodiments,

[0059] The index information includes an index used for sending synchronization signals from multiple cells or multiple base stations.

[0060] In the above embodiments, a method is provided for coordinating the transmission of synchronization signals among multiple cells (or base stations) when forming a cell group.

[0061] In conjunction with some embodiments of the first aspect, in some embodiments,

[0062] The index information includes: the identification information of the corresponding cell or base station;

[0063] The identification information includes: the cell or base station identifier ID or the Media Access Control (MAC) address information.

[0064] In the above embodiments, a method for coordinating index information among multiple cells (or base stations) is provided.

[0065] In conjunction with some embodiments of the first aspect, in some embodiments,

[0066] The network equipment includes a first base station and a second base station;

[0067] The method includes:

[0068] The first base station sends the index information of other base stations besides the second base station to the second base station.

[0069] In the above embodiments, a method is provided for the first base station to send index information to other base stations.

[0070] In conjunction with some embodiments of the first aspect, in some embodiments,

[0071] The SSB index identifier is the transmission timing of the SSB within its respective SSB burst set, or the transmission timing of the SSB within multiple SSB burst sets within a preset time range.

[0072] In the above embodiments, the content identified by the SSB index is provided.

[0073] In conjunction with some embodiments of the first aspect, in some embodiments,

[0074] The SSB burst set index identifier: the transmission timing of the SSB burst set within a preset time range.

[0075] In the above embodiments, the content identified by the SSB burst set index is provided.

[0076] In conjunction with some embodiments of the first aspect, in some embodiments,

[0077] The network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0078] Network devices transmit the Physical Broadcast Channel (PBCH);

[0079] The PBCH includes: an SSB index information field, and / or an SSB burst set index information field; the SSB index is carried in the SSB index information field, and the SSB burst set index is carried in the SSB burst set index information field.

[0080] or

[0081] The SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the higher-layer broadcast channel BCCH-BCH of the PBCH.

[0082] In the above embodiments, a method for explicitly sending the SSB index and / or the SSB burst set index is provided for the network device to send the SSB index.

[0083] In conjunction with some embodiments of the first aspect, in some embodiments,

[0084] The network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0085] The network device transmits a synchronization signal SS and a physical broadcast channel PBCH; the SS and PBCH include the PBCH demodulation reference signal DM-RS.

[0086] PBCH DM-RS includes pre-labeled target DM-RS;

[0087] The generated sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB.

[0088] In the above embodiments, an implicit transmission method is provided for the network device to send the SSB index and / or the SSB burst set index.

[0089] In conjunction with some embodiments of the first aspect, in some embodiments,

[0090] The offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group is the product of the SSB burst set index and the preset basic offset.

[0091] In the above embodiments, a method is provided for the UE to determine the offset based on the SSB burst set index.

[0092] In conjunction with some embodiments of the first aspect, in some embodiments, the SSB index identifies the transmission timing of multiple SSB burst sets within a preset time range, including:

[0093] The SSB index identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

[0094] In the above embodiments, a method is provided for the UE to determine the offset based on the SSB index.

[0095] In conjunction with some embodiments of the first aspect, in some embodiments,

[0096] The SSB index identifier: the transmission timing of the SSB within its respective SSB burst set, including:

[0097] The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set;

[0098] The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

[0099] In the above embodiments, a method is provided for the UE to determine the offset based on the SSB burst set index and the SSB index.

[0100] Secondly, embodiments of this disclosure provide a method for transmitting a synchronization signal, the method comprising:

[0101] User equipment (UE) receives SS and PBCH sent by network equipment;

[0102] The SS and PBCH include index information;

[0103] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0104] In conjunction with some embodiments of the second aspect, in some embodiments, the SSB index identifies: the transmission timing of the SSB within its respective SSB burst set, or the transmission timing of the SSB within multiple SSB burst sets within a preset time range.

[0105] In conjunction with some embodiments of the second aspect, in some embodiments, the SSB burst set index identifies the transmission timing of the SSB burst set within a preset time range.

[0106] In conjunction with some embodiments of the second aspect, in some embodiments, the network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0107] Network devices transmit the Physical Broadcast Channel (PBCH);

[0108] The PBCH includes: an SSB index information field, and / or an SSB burst set index information field; the SSB index is carried in the SSB index information field, and the SSB burst set index is carried in the SSB burst set index information field.

[0109] or

[0110] The SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the higher-layer broadcast channel BCCH-BCH of the PBCH.

[0111] In conjunction with some embodiments of the second aspect, in some embodiments, the network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0112] The network device transmits a synchronization signal SS and a physical broadcast channel PBCH; the SS and PBCH include the PBCH demodulation reference signal DM-RS.

[0113] PBCH DM-RS includes pre-labeled target DM-RS;

[0114] The generated sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB.

[0115] In conjunction with some embodiments of the second aspect, in some embodiments, the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group is the product of the SSB burst set index and a preset basic offset.

[0116] In conjunction with some embodiments of the second aspect, in some embodiments, the SSB index identifies the transmission timing of multiple SSB burst sets within a preset time range, including:

[0117] The SSB index identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

[0118] In conjunction with some embodiments of the second aspect, in some embodiments, the SSB index identifies the transmission timing of the SSB within its respective SSB burst set, including:

[0119] The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set;

[0120] The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

[0121] In conjunction with some embodiments of the second aspect, in some embodiments, the UE determines the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group based on the product of the SSB burst set index and the preset basic offset.

[0122] In conjunction with some embodiments of the second aspect, in some embodiments, the UE determines the absolute time position of the SSB within a preset time range and from the synchronization cycle reference point of the current cell group or base station group based on the SSB index identifier.

[0123] In conjunction with some embodiments of the second aspect, in some embodiments, the UE determines, based on the SSB burst set index and the SSB index, the absolute time position of the SSB within a preset time range from the synchronization cycle reference point of the current cell group or base station group.

[0124] Thirdly, embodiments of this disclosure also provide a network device, which includes at least one of a determining module and a sending module; wherein the network device is used to perform an optional implementation of the first aspect.

[0125] Fourthly, embodiments of this disclosure also provide a user equipment, including: a receiving module; wherein the user equipment is used to execute an optional implementation of the second aspect.

[0126] Fifthly, embodiments of this disclosure also provide a network device, including:

[0127] One or more processors;

[0128] The network device is used to execute an optional implementation of the first aspect.

[0129] Sixthly, embodiments of this disclosure also provide a user equipment, including:

[0130] One or more processors;

[0131] The user equipment is used to execute an optional implementation of the second aspect.

[0132] In a seventh aspect, embodiments of this disclosure also provide a communication system, including a network device and a user equipment; wherein the network device is configured to perform the optional implementation described in the first aspect, and the user equipment is configured to perform the optional implementation described in the second aspect.

[0133] Eighthly, embodiments of this disclosure also provide a storage medium storing instructions that, when executed on a communication device, cause the communication device to perform the optional implementations described in the first and second aspects.

[0134] Ninthly, embodiments of this disclosure provide a program product that, when executed by a communication device, causes the communication device to perform the method as described in the optional implementations of the first and second aspects.

[0135] In a tenth aspect, embodiments of this disclosure provide a computer program that, when run on a computer, causes the computer to perform the methods described in the optional implementations of the first and second aspects.

[0136] Eleventhly, embodiments of this disclosure provide a chip or chip system. The chip or chip system includes processing circuitry configured to perform the methods described according to optional implementations of the first and second aspects above.

[0137] It is understood that the aforementioned network devices, user equipment, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to execute the methods proposed in the embodiments of this disclosure. Therefore, the beneficial effects that can be achieved can be referred to the beneficial effects in the corresponding methods, and will not be repeated here.

[0138] This disclosure provides a synchronization signal transmission method, a network device, a user equipment, and a communication system. In some embodiments, the terms "synchronization signal transmission method" and "signal transmission method," "wireless frame transmission method," etc., can be used interchangeably, as can the terms "information processing system," "communication system," etc.

[0139] This disclosure is not exhaustive, but merely illustrative of some embodiments, and is not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment can be arbitrarily interchanged. Furthermore, the optional implementation methods in a particular embodiment can be arbitrarily combined; moreover, the embodiments can be arbitrarily combined, for example, some or all steps of different embodiments can be arbitrarily combined, and a particular embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0140] In each of the disclosed embodiments, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of the embodiments are consistent and can be referenced by each other. Technical features in different embodiments can be combined to form new embodiments based on their inherent logical relationships.

[0141] The terminology used in the embodiments of this disclosure is for the purpose of describing particular embodiments only and is not intended to limit the scope of this disclosure.

[0142] In the embodiments disclosed herein, "multiple" refers to two or more.

[0143] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0144] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "in response to one case A, in response to another case B", etc., may include the following technical solutions depending on the situation: in some embodiments, A (execute A regardless of B); in some embodiments, B (execute B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, A and B (both A and B are executed). The same applies when there are more branches such as A, B, C, etc.

[0145] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, C, etc.

[0146] The prefixes "first," "second," etc., used in the embodiments of this disclosure are merely for distinguishing different descriptive objects and do not impose restrictions on the position, order, priority, quantity, or content of the descriptive objects. The description of the descriptive objects is found in the claims or the context of the embodiments, and the use of prefixes should not constitute unnecessary restrictions. For example, if the descriptive object is a "field," the ordinal numbers preceding "field" in "first field" and "second field" do not restrict the position or order of the "fields." "First" and "second" do not restrict whether the "fields" they modify are in the same message, nor do they restrict the order of "first field" and "second field." Similarly, if the descriptive object is a "level," the ordinal numbers preceding "level" in "first level" and "second level" do not restrict the priority between "levels." Furthermore, the number of descriptive objects is not limited by ordinal numbers and can be one or more. For example, in "first device," the number of "devices" can be one or more. Furthermore, the objects modified by different prefixes can be the same or different. For example, if the object being described is "device", then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Similarly, if the object being described is "information", then "first information" and "second information" can be the same information or different information, and their content can be the same or different.

[0147] In some embodiments, “including A,” “containing A,” “for indicating A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0148] In some embodiments, the terms “in response to…”, “in response to determining…”, “in the case of…”, “when…”, “if…”, “if…”, etc., can be used interchangeably.

[0149] In some embodiments, the terms “greater than,” “greater than or equal to,” “not less than,” “more than,” “more than or equal to,” “not less than,” “higher than,” “higher than or equal to,” “not lower than,” and “above” can be used interchangeably, as can the terms “less than,” “less than or equal to,” “not greater than,” “less than,” “less than or equal to,” “not more than,” “lower than,” “lower than or equal to,” “not higher than,” and “below”.

[0150] In some embodiments, the apparatus and device may be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they may also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "body", etc.

[0151] In some embodiments, "network" can be interpreted as devices included in the network, such as access network devices, core network devices, etc.

[0152] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)," "base station (BS)," "radio base station," or "fixed station." In some embodiments, it may also be understood as "node," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "antenna panel," "antenna array," "cell," "macro cell," "small cell," "femto cell," "pico cell," "sector," "cell group," "serving cell," "carrier," "component carrier," or "bandwidth part (BWP)."

[0153] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)," "user terminal," "mobile station (MS)," "mobile terminal (MT)," "subscriber station," "mobile unit," "subscriber unit," "wireless unit," "remote unit," "mobile device," "wireless device," "wireless communication device," "remote device," "mobile subscriber station," "access terminal," "mobile terminal," "wireless terminal," "remote terminal," "handset," "user agent," "mobile client," "client," etc.

[0154] In some embodiments, the acquisition of data, information, etc., may comply with the laws and regulations of the country where the location is situated.

[0155] In some embodiments, data, information, etc., may be obtained with the user's consent.

[0156] Furthermore, each element, each row, or each column in the table of this disclosure can be implemented as an independent embodiment, and any combination of any element, any row, or any column can also be implemented as an independent embodiment.

[0157] Figure 1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure.

[0158] As shown in Figure 1, the communication system 100 includes network equipment 101 and user equipment (UE) 102.

[0159] In some embodiments, UE102 includes, but is not limited to, at least one of the following: mobile phone, wearable device, Internet of Things device, car with communication function, smart car, tablet computer, computer with wireless transceiver function, virtual reality (VR) terminal device, augmented reality (AR) terminal device, wireless terminal device in industrial control, wireless terminal device in self-driving, wireless terminal device in remote medical surgery, wireless terminal device in smart grid, wireless terminal device in transportation safety, wireless terminal device in smart city, and wireless terminal device in smart home.

[0160] In some embodiments, network device 101 may include at least one of access network device and core network device.

[0161] In some embodiments, network device 101 may be a single device comprising one or more network elements (or functions), core network elements, or core network functions, or it may be multiple devices or a group of devices, each comprising all or part of the aforementioned one or more network elements. Network elements may be virtual or physical. The core network may include, for example, at least one of the Evolved Packet Core (EPC), 5G Core Network (5GCN), and Next Generation Core (NGC).

[0162] It is understood that the communication system described in this disclosure is for the purpose of more clearly illustrating the technical solutions of this disclosure, and does not constitute a limitation on the technical solutions proposed in this disclosure. As those skilled in the art will know, with the evolution of system architecture and the emergence of new business scenarios, the technical solutions proposed in this disclosure are also applicable to similar technical problems.

[0163] The following embodiments of this disclosure can be applied to the communication system 100 shown in FIG1, or to some of the main bodies, but are not limited thereto. The main bodies shown in FIG1 are illustrative. The communication system may include all or some of the main bodies in FIG1, or may include other main bodies outside of FIG1. ​​The number and form of each main body are arbitrary. Each main body may be physical or virtual. The connection relationship between the main bodies is illustrative. The main bodies may not be connected or may be connected. The connection can be in any way, it can be a direct connection or an indirect connection, it can be a wired connection or a wireless connection.

[0164] The embodiments disclosed herein can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), and IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (a registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X) systems, systems utilizing other resource determination methods, and next-generation systems extended from them, etc. Furthermore, multiple systems can be combined (e.g., a combination of LTE or LTE-A with 5G).

[0165] Figure 2 is an interactive schematic diagram of a synchronization signal transmission method according to an embodiment of the present disclosure. As shown in Figure 2, the method includes:

[0166] Step 201: The network device sends a synchronization signal (SS) and a physical broadcast channel (PBCH).

[0167] The SS and PBCH include index information;

[0168] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0169] Step 202: The user equipment receives the SS and PBCH.

[0170] In mobile communication networks, a UE needs to connect to the network through an initial access procedure before transmitting data. This initial access procedure includes stages such as cell search, system information reception, and random access.

[0171] Cell search is the process by which the UE uses cell synchronization signals to synchronize downlink time and frequency, and to obtain the Physical Cell Identity (PCID). After completing downlink synchronization through cell search, the UE receives and decodes the Physical Broadcast Channel and the Physical Downlink Shared Channel (PDSCH) carrying the minimum remaining system information to obtain the system information necessary for subsequent random access.

[0172] After acquiring system information, the UE performs uplink time synchronization through a random access procedure, transitioning from a non-Radio Resource Control (RRC) connected state (e.g., RRC_IDLE and RRC_INACTIVE) to an RRC connected state (e.g., RRC_CONNECTED) to prepare for uplink and downlink data transmission. The paging procedure helps the network page UEs currently in a non-RRC connected state.

[0173] In 5G systems, the downlink synchronization process involves the New Radio (NR) Synchronization Signal Block (SSB), which includes the Primary Synchronization Signal (PSS), Secondary Synchronization Signal (SSS), and Physical Broadcast Channel (PBCH). The PBCH contains the Demodulation Reference Symbol (DM-RS). When a UE accesses the 5G NR system, it first detects the PSS and SSS to obtain downlink time-frequency synchronization and the PCID, and then decodes the PBCH. The PBCH includes the Master Information Block (MIB) and other information related to the SSB transmission time. The MIB carries a portion of the minimum system information required for the UE to access the NR system. Several SSBs form an SSB Burst set, which is transmitted periodically.

[0174] In a 5G NR system, an SS and PBCH block, i.e. an SSB, are used. In this embodiment of the disclosure, the network device sends the synchronization signal SS and the physical broadcast channel PBCH, which can also be understood as the network device sending the synchronization signal block SSB. In various embodiments, the two descriptions can be interchanged.

[0175] As shown in Figure 3, the SSB consists of three parts: PSS, SSS, PBCH, and DM-RS. The SSB has the following characteristics in the time-frequency domain:

[0176] Time domain: The time domain occupies 4 consecutive Orthogonal Frequency Division Multiplexing (OFDM) symbols, with PSS in symbol #0, SSS in symbol #2, and PBCH in symbols #1, #2, and #3, where PBCH contains DM-RS.

[0177] Frequency domain: An SSB occupies 20 consecutive Physical Resource Blocks (PRBs) in the frequency domain. The mapping method can be found in Table 7.4.3.1-1 of the protocol TS 38.211.

[0178] Among them, PSS and SSS are mapped on 127 subcarriers (Resource Elements, REs) centered on PRB#4 to PRB#15 (a total of 12 PRBs) within their respective OFDM symbols. The 17 REs on these 12 PRBs that are not mapped to PSS or SSS are all mapped to 0.

[0179] The mappings of PBCH and DM-RS on OFDM symbols #1 and #3 respectively occupy all 240 REs of 20 PRBs, and the mapping on OFDM symbol #2 occupies all 96 REs of the first and last 8 PRBs. Therefore, the mapping of PBCH in an SSB accounts for a total of 576 REs.

[0180] The center frequencies of PSS / SSS and PBCH are aligned, and they both use the same subcarrier spacing.

[0181] The synchronization signal SS of NR SSB includes the primary synchronization signal PSS and the secondary synchronization signal SSS. The PSS has three sequences corresponding to three IDs. One PSS corresponds to 336 SSS sequences, and the ID of the SSS is... NR supports a total of 1008 cell identifiers (PCIDs). The ID of each cell is determined by a combination of the PSS sequence and the SSS sequence.

[0182] Regarding NR PSS: The NR PSS sequence is obtained by modulating a 127-length m-sequence with binary phase shift keying (BPSK). The three PSS sequences are obtained by different cyclic shifts.

[0183] Regarding NR SSS: The NR SSS sequence is obtained by BPSK modulation of a 127-length Gold sequence, and 336 SSS sequences are obtained through different cyclic shifts. Gold sequences exhibit good autocorrelation and cross-correlation properties, and their cross-correlation properties are the same as those of m-sequences, but their autocorrelation properties are not as good. When using a generator polynomial of the same order, the number of generated Gold sequences far exceeds the number of m-sequences; therefore, Gold sequences are used for SSS.

[0184] An SSB burst set, also known as an SSB burst collection, is a method used in 5G NR systems to transmit SSBs using beamforming and beam scanning technologies. A group of multiple SSBs transmitted by a cell in one beam scan (i.e., one round-robin) is called an SSB burst set. As shown in Figures 4 and 5, Figure 4 illustrates the spatial beam diagram for transmitting each SSB (SSB0 to SSB7); Figure 5 shows the time corresponding to the transmission of each SSB (SSB0 to SSB7) within each SSB cycle.

[0185] NR systems support higher frequency bands; the higher the frequency, the shorter the transmission distance. Beamforming can increase transmission distance by concentrating energy transmission, but this reduces the coverage angle. To balance transmission distance and coverage, beam scanning is used. As frequency increases, path loss in space also increases, requiring narrower beams to compensate. This means more beams are needed to cover the entire cell; therefore, SSB burst transmission is employed.

[0186] An SSB burst set contains multiple SSBs. The SSB index is determined as shown in Table 1 below. Within a radio half-frame, the SSB index is ordered from 0 to Lmax-1, where Lmax is the maximum number of SSBs that a cell can transmit within a radio half-frame. Since the maximum number of SSBs in an SSB burst set varies across different frequency ranges, the number of bits required to represent the SSB index (SSB index bits) also varies.

[0187] Table 1:

[0188] Furthermore, regarding the SSB transmission period, during initial cell search, the protocol stipulates that the UE will default to a SSB burst transmission period of 20ms, which is the length of two radio frames. Therefore, for cells that support initial cell search, the actual SSB transmission period cannot exceed 20ms, meaning it can be configured to 5ms, 10ms, or 20ms.

[0189] After completing the initial cell search, each serving cell provides the UE with the transmission period of the SSB burst set (contained in the semi-radio frame) through the configuration parameter ssb-periodicityServingCell. The period value includes 5ms, 10ms, 20ms, 40ms, 80ms, and 160ms. If the serving cell does not configure a period value, the UE will default to a transmission period of 5ms for the SSB burst set. The UE assumes that all SSB burst sets within the same cell have the same period.

[0190] Furthermore, regarding the actual SSB transmission indication, the NR protocol specifies the maximum number of SSBs (Lmax, 8, 64) in an SSB burst set for each frequency range. In actual system deployment, the network can configure the actual number of SSBs transmitted in each cell's SSB burst set and their corresponding specific time-domain location / index. That is, the actual number of SSBs transmitted within an SSB burst set must be less than or equal to Lmax.

[0191] The specific reasons are as follows:

[0192] In actual network deployment, operators can configure the SSBs for each cell's burst-concentration transmission based on multiple factors, such as the size of the cell's coverage area, the angular range covered by each SSB beam, the transmit power of the base station equipment, and the number of beams supported by the base station equipment. For example, when deploying macro cells in high-frequency spectrum, more beams are used to combat path loss, and cell coverage is improved through individual beamforming gain; when using low-frequency spectrum, fewer beams can be used to achieve better coverage.

[0193] Resources not used for transmitting SSBs can be used for transmitting PDSCHs. The protocol specifies that symbols and PRBs occupied by SSBs cannot be used for PDSCH transmission. PDSCHs can be used to carry system messages, RAR response messages, and paging messages, etc. Notifying the UE of the specific transmission location of SSBs as early as possible allows the UE to know which resources originally used for transmitting SSBs can actually be used for receiving PDSCHs, thus enabling the UE to perform correct rate matching when receiving PDSCHs.

[0194] The NR protocol specifies that the UE is notified of the actual location and number of SSBs transmitted via the higher-layer parameter ssb-PositionsInBurst. ssb-PositionsInBurst informs the UE of the actual SSB bitmap through two methods (Method 1 and Method 2). The actual SSB transmission location indication is shown in Table 2 below.

[0195] Table 2:

[0196] Method 1: 16 bits in total, indicating relatively low granularity and flexibility, but also low overhead.

[0197] As shown in Figure 6, in FR1, when the maximum number of SSB transmissions is 4, the first 4 bits of inOneGroup are used to indicate the transmission status at the 4 SSB candidate positions within an SSB burst set. "1" indicates an SSB is sent, and "0" indicates no SSB is sent. The k-th bit of the bitmap corresponds to the SSB index k-1. When the maximum number of SSB transmissions is 8, the 8 bits of inOneGroup are used to indicate the transmission status at the 8 SSB candidate positions within an SSB burst set, with a similar indication method. In FR1, the 8 bits of groupPresence information have no practical meaning.

[0198] FR2 specifies a maximum of 64 SSB transmissions. The 8 bits of `inOneGroup` divide the 64 SSB candidate positions within an SSB burst set into 8 groups, with each bit corresponding to one group. When the (m-th)th bit in `inOneGroup` is "1", and the corresponding 8 bits in `inOneGroup` within the (m-th)th group are also set to "1", it indicates that an SSB has actually been transmitted at that position. When the (m-th)th bit in `inOneGroup` is "0", the corresponding 8 SSB candidate positions within the (m-th)th group do not transmit an SSB.

[0199] Method 2: 4 bits, 8 bits, or 64 bits in total, providing high granularity and flexibility, but with high overhead for FR2.

[0200] Method 2 directly corresponds to all SSB candidate positions within an SSB burst set, with bit diagrams for the three cases of 4, 8, or 64. For example, setting the k-th bit to "1" indicates that an SSB was actually sent at the corresponding position, while setting the bit to "0" indicates that an SSB was not actually sent at the corresponding position. Furthermore, the k-th bit directly corresponds to the SSB index k-1.

[0201] Although the NR protocol includes the two indication methods mentioned above, TS 38.331 imposes a restriction on the definition of ssb-PositionsInBurst in method 2: "The network configures the same pattern in this field as in the corresponding field in ServingCellConfigCommonSIB". That is, when the network configures the bit map of the actual SSB transmission position through method 2, it must be consistent with the bit map configured in method 1.

[0202] To minimize the system resource overhead used for the periodic broadcast PBCH, improve the success rate of PBCH decoding during initial access, and ensure reliable reception with sufficient cell coverage and edge coverage, the basic principle of PBCH design is to minimize the PBCH payload. The NR PBCH content is shown in Table 3 below. The NR PBCH payload is 56 bits, of which 24 bits come from the higher-layer broadcast channel BCCH-BCH, including 23 bits of MIB. The physical layer provides the remaining 32 bits of the PBCH, including 8 bits of information related to SSB transmission time and 24 bits of CRC. Within an SSB burst set, the PBCH content of all SSBs is identical, except for the SSB index and CRC.

[0203] Table 3:

[0204] The main applications of PBCH DM-RS are as follows:

[0205] (1) Channel estimation

[0206] (2) Indicating a partial or complete SSB index: The DM-RS carries a small amount of SSB index information, i.e., a maximum of 3 bits. Indicating the SSB index in the DM-RS helps reduce the number of bits carried in the PBCH, allowing the UE to directly obtain SSB timing information from the PBCH DM-RS without decoding the PBCH; however, it also increases the implementation complexity of the UE, because the UE needs to perform blind detection, which affects the performance of channel estimation and the reliability of SSB index estimation. Ultimately, a compromise of a maximum of 3 bits is adopted.

[0207] FR1, DM-RS indicates the complete SSB index, 2 bits or 3 bits.

[0208] FR2, DM-RS indicates the 3-bit LSB of the SSB index.

[0209] Regarding the generation process of PBCH DM-RS, the NR PBCH DM-RS sequence is a random sequence generated from a Gold sequence of order 31, and the desired DM-RS sequence is obtained by QPSK modulation.

[0210] The maximum number of SSBs in the SSB burst set L=4: The parameters used in the initialization formula of the scrambling sequence include cell ID, half radio frame identifier (1 bit), and SSB index (indicating the full SSB index 2 bits).

[0211] The maximum number of SSBs in the SSB burst set is L=8: The parameters used for initializing the consensus of the scrambled sequence include cell ID and SSB index (indicating the complete SSB index 3 bits).

[0212] The maximum number of SSBs in the SSB burst set is L = 64: The parameters used for initializing the consensus of the scrambled sequence include cell ID, SSB index (the indicator part SSB index 3 bits LSB).

[0213] Regarding the resource mapping of PBCH DM-RS:

[0214] Time domain: PBCH DM-RS is located on the last 3 OFDM symbols of an SSB.

[0215] Frequency Domain: PBCH DM-RS are uniformly mapped onto the frequency domain resources of PBCH at intervals of 4 REs, meaning that one DM-RS will appear in every 4 REs. During the mapping process, in order to randomize the mutual interference of PBCH DM-RS between cells, a quantization parameter v = cell ID mod 4 is introduced. That is, when PBCH DM-RS is mapped to RE, the RE offset is performed according to the parameter v.

[0216] In this embodiment of the disclosure, the index information includes, for example, an index for transmitting synchronization signals from multiple cells or multiple base stations. The network device transmits synchronization signals from multiple cells (or multiple base stations), and the SS and PBCH include index information; the index information includes: a synchronization signal block (SSB) index, and / or, an SSB burst set index.

[0217] Specifically, for a cell group (or base station group) consisting of multiple cells (or base stations), an SSB burst set index is defined, which is used by the UE to obtain relevant time information after receiving an SSB. For example, the SSB burst set index is used to identify the transmission timing of the SSB burst set within a preset time range. For instance, the SSB burst sets are numbered independently, and the UE uses this information to obtain relevant time information about the SSB burst sets.

[0218] The SSB index is used to identify the transmission timing of the corresponding SSB within all SSB burst sets. For example, for all SSBs included in multiple SSB burst sets within a certain time range (e.g., within a cell period), the SSB index is uniformly numbered to determine the relevant time information obtained by the UE based on the SSB index. Alternatively, the SSB index is used to determine the transmission timing of the corresponding SSB within its respective SSB burst set, allowing the UE to jointly determine the relevant time information based on the SSB burst set index and the SSB index.

[0219] Specifically, in a 5G NR system, as shown in Figure 3, each cell (base station) transmits SSB burst sets according to a predetermined period value T. The applicant found that if several adjacent cells transmit SSB burst sets with shorter periods (e.g., period T = 5ms, 20ms), each cell will have a large amount of synchronization signals consuming significant resources. These resources can only be used for SSB transmission and cannot be used for downlink transmission or uplink reception. Furthermore, frequent SSB transmission is very power-intensive for the base station, significantly increasing its operating costs. Currently, energy-saving technologies have become the mainstream trend and main research direction for future wireless communication technologies. Whether it's energy saving on the network side or energy saving on the terminal side, it can bring significant "energy saving and efficiency improvement" effects to the entire wireless communication system.

[0220] In this embodiment of the disclosure, when the network device implements a cell group composed of multiple cells (or base stations), they coordinate to send synchronization signals to each other. This allows the period for each cell (or base station) to send the synchronization signal to be extended, while simultaneously supporting time-division multiplexing (TDM) transmission in the time domain for each cell (or base station) within the cell group. This ensures that all synchronization signals sent within the cell group are relatively dispersed within a single period, enabling the UE to detect / receive the synchronization signal in the shortest possible time (much shorter than the synchronization period) regardless of which cell (or base station) it is within.

[0221] In this embodiment of the disclosure, when multiple cells (or base stations) form a cell group, the network device coordinates the transmission of synchronization signals to each other. The SSB index (synchronization block index value) is used to indicate the transmission sequence number and location information of the SSB within an SSB burst set.

[0222] In some embodiments, the process of multiple cells (or base stations) coordinating the transmission of synchronization signals includes, for example, the index information including: the identification information of the corresponding cell or base station;

[0223] The identification information includes: the cell or base station identifier ID or Media Access Control (MAC) address information.

[0224] The cell's identifier ID or MAC address information is used to identify the cell corresponding to the index information, and the base station's identifier or MAC address information is used to identify the base station corresponding to the index information.

[0225] In some embodiments, the network device includes a first base station and a second base station;

[0226] The method includes:

[0227] The first base station sends the index information of other base stations besides the second base station to the second base station.

[0228] For example, the first base station sends index information of multiple other base stations to the second base station. The second base station identifies the cell or base station corresponding to each index information based on the identification information. In this way, when coordinating signal transmission among multiple base stations, multiple base stations can identify each other through the identification information in the index information.

[0229] Furthermore, when multiple cells (or base stations) coordinate to send synchronization signals, after the UE receives the SS and PBCH, it determines the relevant information for downlink time and frequency synchronization based on the SSB index and / or SSB burst set index. For example, it determines which cell (or base station) the current SSB was sent by by summarizing the identification information through the index information, and determines which SSB burst set the current SSB belongs to, which SSB in the current SSB burst set, the specific location of the SSB in the radio frame, and the OFDM symbol occupied by the time slot through the index information.

[0230] Specifically, the order of each SSB in the SSB burst set, and the total number of SSBs in an SSB burst set, together determine the location information of an SSB in a radio half-frame. Within an SSB burst set, each SSB corresponds to an SSB index. The UE can obtain the location of which four OFDM symbols in which time slot within a radio half-frame the current SSB is based on the index corresponding to the received SSB.

[0231] In some embodiments, the content identified by the SSB index is divided into case 1 or case 2:

[0232] Case 1, the SSB index identifier: the transmission timing of the SSB within its respective SSB burst set;

[0233] Case 2: The transmission timing of multiple SSB burst sets within a preset time range.

[0234] It is understood that in this embodiment of the disclosure, the transmission timing is the order in which the transmission occurs.

[0235] In Case 1, the SSB indexes within each SSB burst set are numbered independently; for example, if each SSB burst set contains K SSBs, then the SSB index value range within each SSB burst set can be [0, K-1] or [1, K].

[0236] In scenario 2, all SSBs within an SSB burst set are uniformly indexed. When N cells (or base stations) form a cell group (or base station group), and these N cells (or base stations) jointly coordinate the transmission of synchronization signals, all SSBs within the N SSB burst sets are uniformly indexed. For example, if each SSB burst set contains K SSBs, then a cell group contains a total of K*N SSBs in one period. The index numbers for all SSBs can be uniformly assigned values, ranging from [0, K*N-1] or [1, K*N]. After obtaining the current SSB index, the UE can determine the absolute time position of the current SSB within a cell group synchronization period, i.e., the four OFDM symbols occupied by the current SSB, as well as its time slot and frame.

[0237] Optionally, the SSB index is uniformly numbered, so the UE does not need to obtain the SSB burst set index, but can obtain the time information of the current SSB based solely on the SSB index.

[0238] In some embodiments, the SSB burst set index identifies the transmission timing of the SSB burst set within a preset time range.

[0239] Each SSB burst set transmitted by a cell (or base station) corresponds to an "SSB burst set index". When N cells (or base stations) form a cell group (or base station group), the value range of the above SSB burst set index is [0, N-1] or [1, N]. When network devices jointly coordinate the transmission of synchronization signals from N cells (or base stations), each cell (or base station) within the cell group transmits an SSB burst set corresponding to its own SSB burst set index.

[0240] Referring to Figure 7, Figure 7 is a second interactive schematic diagram of a synchronization signal transmission method according to an embodiment of the present disclosure. As shown in Figure 7, the above method includes:

[0241] Step 701: The network device sends the Physical Broadcast Channel (PBCH).

[0242] The way in which the SSB index and / or the SSB burst set index is carried in the synchronization signal may include the following method 1 or method 2:

[0243] Method 1, wherein the PBCH includes: an SSB index information field, and / or an SSB burst set index information field; the SSB index is carried in the SSB index information field, and the SSB burst set index is carried in the SSB burst set index information field;

[0244] Method 2, the SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the Broadcast Control Channel-Broadcast Channel (BCCH-BCH) in the higher-layer broadcast channel of the PBCH.

[0245] The SSB includes the PSS, SSS, and PBCH. The PBCH contains the Demodulation Reference Symbol (DM-RS). When a UE accesses the 5G NR system, it first detects the PSS and SSS to obtain downlink time-frequency synchronization and the PCID, and then decodes the PBCH. The PBCH includes the MIB and other information related to the SSB transmission time. The MIB carries a portion of the minimum system information required for the UE to access the NR system.

[0246] In Method 1, the following fields are set in the PBCH: SSB index information field and / or SSB burst set index information field;

[0247] For example, an M-bit SSB burst set index information field is set in the PBCH to indicate the SSB burst set index corresponding to the current SSB burst set; and / or, an N-bit SSB index information field is set in the PBCH, wherein the SSB index is carried in the SSB index information field.

[0248] In mode 2, the SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the higher-layer broadcast channel BCCH-BCH of the PBCH, and are contained in the main information block provided by the higher layer.

[0249] Step 702: The user equipment receives the PBCH.

[0250] Referring to Figure 8, Figure 8 is a third interactive schematic diagram of a synchronization signal transmission method according to an embodiment of the present disclosure. As shown in Figure 8, the above method includes:

[0251] Step 801: The network device sends a synchronization signal SS and a physical broadcast channel PBCH; the SS and PBCH include the PBCH demodulation reference signal DM-RS;

[0252] PBCH DM-RS includes pre-labeled target DM-RS;

[0253] The generated sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB.

[0254] The SSB index and / or SSB burst set index can be implicitly indicated through the DM-RS. The PBCH DM-RS carries a pre-labeled target DM-RS, and the generation sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB. Thus, when the UE receives an SSB, it performs blind detection on the DM-RS of the PBCH: The UE performs trial detection on potential candidate DM-RS according to a pre-set pre-labeling rule. If a DM-RS among the candidate DM-RS is successfully matched, the blind detection is successful. The successfully blind-detected DM-RS is the target DM-RS. The target DM-RS contains a parameter Pindex during sequence generation, which corresponds to the SSB index and / or SSB burst set index.

[0255] As an example, the blind detection process is as follows: The network device and the UE pre-agree on N different DM-RS sequences. When transmitting, the network device selects one of the DM-RS sequences j. After receiving the signal, the UE will try all the different DM-RS candidate sequences among the N until it finds the sequence j actually transmitted by the sender. The N different DM-RS can implicitly correspond to different information. When the UE blindly detects sequence j, it also obtains the implicitly indicated information.

[0256] Step 802: The user equipment receives the SS and PBCH and detects the target DM-RS in the DM-RS;

[0257] Obtain the SSB index and / or SSB burst set index of the SSB carried in the generated sequence of the target DM-RS.

[0258] In some embodiments, the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group is the product of the SSB burst set index and a preset basic offset.

[0259] Specifically, the offset of the current SSB burst set from the synchronization cycle reference point of the current cell group or base station group can be obtained through the SSB burst set index. The offset ΔT = basic offset * SSB burst set index, where the basic offset is known to the UE in advance (similar to the DM-RS sequence, it is written to the device through precoding).

[0260] Referring to Figure 9, Figure 9 is a fourth interactive schematic diagram of a synchronization signal transmission method according to an embodiment of the present disclosure. As shown in Figure 9, the above method includes:

[0261] Step 901: The network device sends the synchronization signal SS and the physical broadcast channel PBCH;

[0262] The SS and PBCH include index information;

[0263] The index information includes: SSB burst set index.

[0264] Step 902: The UE determines the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group based on the product of the SSB burst set index and the preset basic offset.

[0265] Taking Figure 10 as an example, a cell group contains four SSB burst sets, and each cell (or base station) transmits a synchronization signal every 320ms. The SSB burst set index is determined by the network device and may not be directly associated with the cell (or base station) ID information. For example, within this cell group, the four SSB burst sets are indexed and numbered within a 320ms interval, with indices ranging from #0 to #3. The UE can obtain the offset of the current SSB burst set from the reference point using the obtained SSB burst set index, as shown in Figure 10, where each SSB burst set corresponds to an offset.

[0266] In some embodiments, the SSB index identifies the transmission timing of multiple SSB burst sets within a preset time range, including:

[0267] The SSB index identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

[0268] The preset time range can be the transmission period of the synchronization signal or other time values.

[0269] All SSBs within an SSB burst set are assigned a unified index number. When N cells (or base stations) form a cell group (or base station group), and these N cells (or base stations) jointly coordinate the transmission of synchronization signals, all SSBs within the N SSB burst sets are assigned a unified index number. For example, if each SSB burst set contains K SSBs, then a cell group contains a total of K*N SSBs in one period. The index number of all SSBs can be assigned a unified value, ranging from [0, K*N-1] or [1, K*N]. After obtaining the current SSB index, the UE can determine the absolute time position of the current SSB within a cell group synchronization period, i.e., the four OFDM symbols occupied by the current SSB, as well as its time slot and frame.

[0270] Optionally, the SSB index is uniformly numbered, so the UE does not need to obtain the SSB burst set index, but can obtain the time information of the current SSB based solely on the SSB index.

[0271] Referring to Figure 11, Figure 11 is a fifth interactive schematic diagram of a synchronization signal transmission method according to an embodiment of the present disclosure. As shown in Figure 11, the above method includes:

[0272] Step 1101: The network device sends the synchronization signal SS and the physical broadcast channel PBCH;

[0273] The SS and PBCH include index information;

[0274] The index information includes: SSB index, which identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

[0275] Step 1102: The UE determines the absolute time position of the SSB within a preset time range and from the synchronization cycle reference point of the current cell group or base station group based on the SSB index identifier.

[0276] Taking Figure 12 as an example, the SSB indexes within each SSB burst set are numbered, meaning that all SSBs within a period of a cell group are uniformly indexed and numbered. Four cells (or base stations) transmit a total of four SSB burst sets within one period, each burst set containing four SSBs, for a total of 16 SSBs.

[0277] After being uniformly numbered, the index values ​​of SSBs range from #0 to #15. With all SSB indices uniformly numbered, within a period, the UE can obtain the SSB burst set information of the current SSB based solely on the SSB index, without needing additional SSB burst set information.

[0278] In some embodiments, the SSB index identifies the transmission timing of the SSB within its respective SSB burst set, including:

[0279] The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set;

[0280] The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

[0281] Within each SSB burst set, the SSB index is independently numbered; for example, if each SSB burst set contains K SSBs, then the SSB index value within each SSB burst set can be in the range of [0, K-1] or [1, K]. The UE needs to use the SSB burst set index and the SSB index together to obtain the relevant time information.

[0282] Referring to Figure 13, Figure 13 is a sixth interactive schematic diagram of a synchronization signal transmission method according to an embodiment of the present disclosure. As shown in Figure 13, the above method includes:

[0283] Step 1301: The network device sends the synchronization signal SS and the physical broadcast channel PBCH;

[0284] The SS and PBCH include index information;

[0285] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0286] The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set;

[0287] The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

[0288] Step 1302: The UE determines, based on the SSB burst set index and the SSB index, the absolute time position of the SSB within a preset time range from the synchronization cycle reference point of the current cell group or base station group.

[0289] Taking Figure 14 as an example, within a cell group, the SSBs in each SSB burst set within a period are independently indexed and numbered. The SSB indices in SSB burst set #0 range from #0 to #3, and similarly, the SSB indices in other SSB burst sets also range from #0 to #3. Since the SSB index values ​​are the same within each SSB burst set, the UE needs to use the SSB burst set index and the SSB index together to obtain the relevant time information.

[0290] In this embodiment of the disclosure, when the network device coordinates the transmission of synchronization signals when multiple cells (or base stations) form a cell group, after the UE receives the SS and PBCH, it determines the relevant information for downlink time and frequency synchronization based on the SSB index and / or SSB burst set index, so as to further improve the downlink synchronization process of the 5G NR system.

[0291] In some embodiments, the names of information, etc., are not limited to the names described in the embodiments. Terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0292] In some embodiments, terms such as “moment,” “point in time,” “time,” and “time location” can be used interchangeably, as can terms such as “duration,” “segment,” “time window,” “window,” and “time.”

[0293] In some embodiments, terms such as wireless access scheme and waveform can be used interchangeably.

[0294] In some embodiments, terms such as "certain," "preset," "default," "set," "indicated," "a certain," "any," and "first" can be used interchangeably. "Certain A," "preset A," "default A," "set A," "indicated A," "a certain A," "any A," and "first A" can be interpreted as A pre-defined in a protocol or the like, or as A obtained through setting, configuration, or instruction, or as specific A, a certain A, any A, or first A, but are not limited thereto.

[0295] In some embodiments, the determination or judgment can be made by a value represented by 1 bit (0 or 1), or by a true or false value (boolean), or by a comparison of numerical values ​​(e.g., a comparison with a predetermined value), but is not limited thereto.

[0296] In some embodiments, "not expecting to receive" can be interpreted as not receiving on time domain resources and / or frequency domain resources, or as not performing subsequent processing on the data after receiving it; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the receiver to respond to the sent content.

[0297] The synchronization signal transmission method disclosed in this embodiment may include the foregoing steps and at least one of the embodiments. For example, step 201 can be implemented as an independent embodiment, step 202 can be implemented as an independent embodiment, step 701 can be implemented as an independent embodiment, step 702 can be implemented as an independent embodiment, step 801 can be implemented as an independent embodiment, step 802 can be implemented as an independent embodiment, step 901 can be implemented as an independent embodiment, step 902 can be implemented as an independent embodiment, step 1101 can be implemented as an independent embodiment, step 1102 can be implemented as an independent embodiment, and step 1301 can be implemented as an independent embodiment. The embodiments are implemented as follows: step 1302 can be implemented as an independent embodiment; the combination of steps 201 and 202 can be implemented as an independent embodiment; the combination of steps 701 and 702 can be implemented as an independent embodiment; the combination of steps 801 and 802 can be implemented as an independent embodiment; the combination of steps 901 and 902 can be implemented as an independent embodiment; the combination of steps 1101 and 1102 can be implemented as an independent embodiment; the combination of steps 1301 and 1302 can be implemented as an independent embodiment, but are not limited thereto.

[0298] In some embodiments, other alternative implementations may be described before or after the specification corresponding to Figures 2 to 14.

[0299] Figure 15 is a schematic flowchart of a synchronization signal transmission method according to an embodiment of the present disclosure.

[0300] As shown in Figure 15, the above method can be applied to network device 101, and the method includes:

[0301] Step 1501: The network device sends the synchronization signal SS and the physical broadcast channel PBCH;

[0302] The SS and PBCH include index information;

[0303] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0304] Optionally, in this embodiment of the disclosure, the index information includes: an index for transmitting synchronization signals from multiple cells or multiple base stations.

[0305] Optionally, in this embodiment of the disclosure, the index information includes: the identification information of the corresponding cell or base station;

[0306] The identification information includes: the cell or base station identifier ID or the Media Access Control (MAC) address information.

[0307] Optionally, in this embodiment of the disclosure, the network device includes a first base station and a second base station;

[0308] The method includes:

[0309] The first base station sends the index information of other base stations besides the second base station to the second base station.

[0310] Optionally, in this embodiment of the disclosure, the SSB index identifies: the transmission timing of the SSB within its respective SSB burst set, or the transmission timing of the SSB within multiple SSB burst sets within a preset time range.

[0311] Optionally, in this embodiment of the disclosure, the SSB burst set index identifies the transmission timing of the SSB burst set within a preset time range.

[0312] Optionally, in this embodiment of the disclosure, the network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0313] Network devices transmit the Physical Broadcast Channel (PBCH);

[0314] The PBCH includes: an SSB index information field, and / or an SSB burst set index information field; the SSB index is carried in the SSB index information field, and the SSB burst set index is carried in the SSB burst set index information field.

[0315] or

[0316] The SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the higher-layer broadcast channel BCCH-BCH of the PBCH.

[0317] Optionally, in this embodiment of the disclosure, the network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0318] The network device transmits a synchronization signal SS and a physical broadcast channel PBCH; the SS and PBCH include the PBCH demodulation reference signal DM-RS.

[0319] PBCH DM-RS includes pre-labeled target DM-RS;

[0320] The generated sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB.

[0321] Optionally, in this embodiment of the disclosure, the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group is the product of the SSB burst set index and a preset basic offset.

[0322] Optionally, in this embodiment of the disclosure, the SSB index identifies the transmission timing of multiple SSB burst sets within a preset time range, including:

[0323] The SSB index identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

[0324] Optionally, in this embodiment of the disclosure, the SSB index identifies the transmission timing of the SSB within its respective SSB burst set, including:

[0325] The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set;

[0326] The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

[0327] The synchronization signal transmission method involved in the embodiments of this disclosure may include the foregoing steps and at least one of the embodiments.

[0328] In some embodiments, other alternative implementations described before or after the specification corresponding to FIG15 may be referred to.

[0329] Figure 16 is a second schematic flowchart illustrating a synchronization signal transmission method according to an embodiment of the present disclosure.

[0330] As shown in Figure 16, the method includes:

[0331] Step 1601: The user equipment (UE) receives the SS and PBCH sent by the network device;

[0332] The SS and PBCH include index information;

[0333] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0334] Optionally, in this embodiment of the disclosure, the index information includes: an index for transmitting synchronization signals from multiple cells or multiple base stations.

[0335] Optionally, in this embodiment of the disclosure, the index information includes: the identification information of the corresponding cell or base station;

[0336] The identification information includes: the cell or base station identifier ID or the Media Access Control (MAC) address information.

[0337] Optionally, in this embodiment of the disclosure, the network device includes a first base station and a second base station;

[0338] The method includes:

[0339] The first base station sends the index information of other base stations besides the second base station to the second base station.

[0340] Optionally, in this embodiment of the disclosure, the SSB index identifies: the transmission timing of the SSB within its respective SSB burst set, or the transmission timing of the SSB within multiple SSB burst sets within a preset time range.

[0341] Optionally, in this embodiment of the disclosure, the SSB burst set index identifies the transmission timing of the SSB burst set within a preset time range.

[0342] Optionally, in this embodiment of the disclosure, the network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0343] Network devices transmit the Physical Broadcast Channel (PBCH);

[0344] The PBCH includes: an SSB index information field, and / or an SSB burst set index information field; the SSB index is carried in the SSB index information field, and the SSB burst set index is carried in the SSB burst set index information field.

[0345] or

[0346] The SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the higher-layer broadcast channel BCCH-BCH of the PBCH.

[0347] Optionally, in this embodiment of the disclosure, the network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including:

[0348] The network device transmits a synchronization signal SS and a physical broadcast channel PBCH; the SS and PBCH include the PBCH demodulation reference signal DM-RS.

[0349] PBCH DM-RS includes pre-labeled target DM-RS;

[0350] The generated sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB.

[0351] Optionally, in this embodiment of the disclosure, the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group is the product of the SSB burst set index and a preset basic offset.

[0352] Optionally, in this embodiment of the disclosure, the SSB index identifies the transmission timing of multiple SSB burst sets within a preset time range, including:

[0353] The SSB index identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

[0354] Optionally, in this embodiment of the disclosure, the SSB index identifies the transmission timing of the SSB within its respective SSB burst set, including:

[0355] The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set;

[0356] The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

[0357] Optionally, in this embodiment of the disclosure, the UE determines the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group based on the product of the SSB burst set index and the preset basic offset.

[0358] Optionally, in this embodiment of the disclosure, the UE determines the absolute time position of the SSB within a preset time range and from the synchronization cycle reference point of the current cell group or base station group based on the SSB index identifier.

[0359] Optionally, in this embodiment of the disclosure, the UE determines, based on the SSB burst set index and the SSB index, the absolute time position of the SSB within a preset time range from the synchronization cycle reference point of the current cell group or base station group.

[0360] This disclosure also provides an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing the steps performed by the terminal in any of the above methods. Alternatively, another apparatus is provided that includes units or modules for implementing the steps performed by a network device (e.g., an access network device, a core network functional node, a core network device, etc.) in any of the above methods.

[0361] It should be understood that the division of units or modules in the above device is only a logical functional division. In actual implementation, they can be fully or partially integrated into a single physical entity, or they can be physically separated. Furthermore, the units or modules in the device can be implemented by a processor calling software: for example, the device includes a processor connected to a memory containing instructions. The processor calls the instructions stored in the memory to implement any of the above methods or to implement the functions of the units or modules in the above device. The processor can be, for example, a general-purpose processor, such as a Central Processing Unit (CPU) or a microprocessor, and the memory can be internal or external to the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits. The functionality of some or all of the units or modules can be achieved through the design of these hardware circuits, which can be understood as one or more processors. For example, in one implementation, the hardware circuit is an application-specific integrated circuit (ASIC). The functionality of some or all of the units or modules is achieved through the design of the logical relationships between the components within the circuit. In another implementation, the hardware circuit can be implemented using a programmable logic device (PLD). Taking a field-programmable gate array (FPGA) as an example, it can include a large number of logic gates. The connection relationships between the logic gates are configured through configuration files, thereby achieving the functionality of some or all of the units or modules. All units or modules of the above device can be implemented entirely through processor-called software, entirely through hardware circuits, or partially through processor-called software with the remaining parts implemented through hardware circuits.

[0362] In this embodiment, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction read and execute capabilities, such as a Central Processing Unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationships of hardware circuits. The logical relationships of the aforementioned hardware circuits are fixed or reconfigurable. For example, the processor is a hardware circuit implemented using an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and configuring the hardware circuit can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. Furthermore, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a Neural Network Processing Unit (NPU), a Tensor Processing Unit (TPU), or a Deep Learning Processing Unit (DPU).

[0363] Figure 17 is a schematic diagram of the structure of a network device proposed in an embodiment of this disclosure. As shown in Figure 17, the network device 1700 may include a transmitting module 1701.

[0364] In some embodiments, the above-described sending module 1701 is used to send SS and PBCH;

[0365] The SS and PBCH include index information;

[0366] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0367] Optionally, the sending module 1701 is used to perform at least one of the communication steps performed by the network device 101 in any of the above methods (e.g., steps 201, 701, 801, 901, 1101, 1301, 1501, but not limited thereto), which will not be elaborated here.

[0368] Figure 18 is a schematic diagram of the structure of a user equipment according to an embodiment of this disclosure. As shown in Figure 18, the user equipment 1800 may include a receiving module 1801.

[0369] In some embodiments, the receiving module 1801 is configured to receive SS and PBCH sent by the network device;

[0370] The SS and PBCH include index information;

[0371] The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

[0372] Optionally, the receiving module 1801 is used to perform at least one of the communication steps performed by the user equipment 102 in any of the above methods (e.g., steps 202, 702, 802, 902, 1102, 1302, 1601, but not limited thereto), which will not be elaborated here.

[0373] Figure 19 is a schematic diagram of the structure of a terminal 1900 (e.g., a user equipment) proposed in an embodiment of this disclosure. The terminal 1900 may be a chip, chip system, or processor that supports network devices in implementing any of the above methods, or it may be a chip, chip system, or processor that supports a terminal in implementing any of the above methods. The terminal 1900 can be used to implement the methods described in the above method embodiments; for details, please refer to the descriptions in the above method embodiments.

[0374] As shown in Figure 19, terminal 1900 includes one or more processors 1901. Processor 1901 can be a general-purpose processor or a dedicated processor, such as a baseband processor or a central processing unit (CPU). The baseband processor can be used to process communication protocols and communication data, while the CPU can be used to control communication devices (e.g., base stations, baseband chips, terminal devices, terminal device chips, DUs or CUs, etc.), execute programs, and process program data. Terminal 1900 is used to execute any of the above methods.

[0375] In some embodiments, terminal 1900 further includes one or more memories 1902 for storing instructions. Optionally, all or part of the memories 1902 may also be located outside of terminal 1900.

[0376] In some embodiments, terminal 1900 further includes one or more transceivers 1904. When terminal 1900 includes one or more transceivers 1904, transceivers 1904 perform at least one of the communication steps such as sending and / or receiving in the above method (e.g., steps 201, 202, 701, 702, 801, 802, 901, 902, 1101, 1102, 1301, 1302, 1501, 1601, but not limited thereto), while processor 1901 performs other steps.

[0377] In some embodiments, a transceiver may include a receiver and / or a transmitter, which may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, etc., may be used interchangeably; the terms transmitter, transmitting unit, transmitter, transmitting circuit, etc., may be used interchangeably; and the terms receiver, receiving unit, receiver, receiving circuit, etc., may be used interchangeably.

[0378] In some embodiments, terminal 1900 may include one or more interface circuits 1903. Optionally, interface circuit 1903 is connected to memory 1902, and interface circuit 1903 can be used to receive signals from memory 1902 or other devices, and can be used to send signals to memory 1902 or other devices. For example, interface circuit 1903 can read instructions stored in memory 1902 and send the instructions to processor 1901.

[0379] The terminal 1900 described in the above embodiments may be a user equipment or other communication device, but the scope of the terminal 1900 described in this disclosure is not limited thereto, and the structure of the terminal 1900 may not be limited by FIG19. The communication device may be an independent device or a part of a larger device. For example, the communication device may be: (1) an independent integrated circuit IC, or chip, or chip system or subsystem; (2) a set of one or more ICs, optionally, the IC set may also include storage components for storing data and programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, terminal device, smart terminal device, cellular phone, wireless device, handheld device, mobile unit, vehicle device, network device, cloud device, artificial intelligence device, etc.; (6) others, etc.

[0380] Figure 20 is a schematic diagram of the structure of the chip 2000 proposed in an embodiment of this disclosure. For cases where the terminal 1900 can be a chip or a chip system, the schematic diagram of the chip 2000 shown in Figure 20 can be referenced, but is not limited thereto.

[0381] Chip 2000 includes one or more processors 2001, which are used to perform any of the above methods.

[0382] In some embodiments, chip 2000 further includes one or more 2003s. Optionally, interface circuitry 2003 is connected to memory 2002. Interface circuitry 2003 can be used to receive signals from memory 2002 or other devices, and interface circuitry 2003 can be used to send signals to memory 2002 or other devices. For example, interface circuitry 2003 can read instructions stored in memory 2002 and send the instructions to processor 2001.

[0383] In some embodiments, the interface circuit 2003 performs at least one of the communication steps such as sending and / or receiving in the above method (e.g., steps 201, 202, 701, 702, 801, 802, 901, 902, 1101, 1102, 1301, 1302, 1501, 1601, but not limited thereto), while the processor 2001 performs other steps.

[0384] In some embodiments, the terms interface circuit, interface, transceiver pin, transceiver, etc., can be used interchangeably.

[0385] In some embodiments, chip 2000 further includes one or more memories 2002 for storing instructions. Optionally, all or part of the memories 2002 may be located outside of chip 2000.

[0386] This disclosure also proposes a storage medium storing instructions that, when executed on terminal 1900, cause terminal 1900 to perform any of the methods described above. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but not limited thereto; it may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but not limited thereto; it may also be a temporary storage medium.

[0387] This disclosure also proposes a program product that, when executed by terminal 1900, causes terminal 1900 to perform any of the above methods. Optionally, the program product is a computer program product.

[0388] This disclosure also proposes a computer program that, when run on a computer, causes the computer to perform any of the above methods.

Claims

1. A method for transmitting synchronous signals, characterized in that, The method includes: Network devices send synchronization signals (SS) and physical broadcast channels (PBCH); The SS and PBCH include index information; The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

2. The synchronization signal transmission method according to claim 1, characterized in that, The index information includes an index used for sending synchronization signals from multiple cells or multiple base stations.

3. The synchronization signal transmission method according to claim 2, characterized in that, The index information includes: the identification information of the corresponding cell or base station; The identification information includes: the cell or base station identifier ID or the Media Access Control (MAC) address information.

4. The synchronization signal transmission method according to claim 2 or 3, characterized in that, The network equipment includes a first base station and a second base station; The method includes: The first base station sends the index information of other base stations besides the second base station to the second base station.

5. The synchronization signal transmission method according to any one of claims 1 to 4, characterized in that, The SSB index identifier is the transmission timing of the SSB within its respective SSB burst set, or the transmission timing of the SSB within multiple SSB burst sets within a preset time range.

6. The synchronization signal transmission method according to any one of claims 1 to 5, characterized in that, The SSB burst set index identifier: the transmission timing of the SSB burst set within a preset time range.

7. The synchronization signal transmission method according to any one of claims 1 to 6, characterized in that, The network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including: Network devices transmit the Physical Broadcast Channel (PBCH); The PBCH includes: an SSB index information field, and / or an SSB burst set index information field; the SSB index is carried in the SSB index information field, and the SSB burst set index is carried in the SSB burst set index information field. or The SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the higher-layer broadcast channel BCCH-BCH of the PBCH.

8. The synchronization signal transmission method according to any one of claims 1 to 6, characterized in that, The network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including: The network device transmits a synchronization signal SS and a physical broadcast channel PBCH; the SS and PBCH include the PBCH demodulation reference signal DM-RS. PBCH DM-RS includes pre-labeled target DM-RS; The generated sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB.

9. The synchronization signal transmission method according to any one of claims 1 to 11, characterized in that, The offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group is the product of the SSB burst set index and the preset basic offset.

10. The synchronization signal transmission method according to any one of claims 5 to 9, characterized in that, The SSB index identifies the transmission timing of multiple SSB burst sets within a preset time range, including: The SSB index identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

11. The synchronization signal transmission method according to any one of claims 5 to 9, characterized in that, The SSB index identifier: the transmission timing of the SSB within its respective SSB burst set, including: The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set; The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

12. A method for transmitting a synchronization signal, characterized in that, The method includes: User equipment (UE) receives SS and PBCH sent by network equipment; The SS and PBCH include index information; The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

13. The synchronization signal transmission method according to claim 12, characterized in that, The index information includes an index used for sending synchronization signals from multiple cells or multiple base stations.

14. The synchronization signal transmission method according to claim 14, characterized in that, The index information includes: the identification information of the corresponding cell or base station; The identification information includes: the cell or base station identifier ID or the Media Access Control (MAC) address information.

15. The synchronization signal transmission method according to claim 13 or 14, characterized in that, The network equipment includes a first base station and a second base station; The method includes: The first base station sends the index information of other base stations besides the second base station to the second base station.

16. The synchronization signal transmission method according to any one of claims 12 to 15, characterized in that, The SSB index identifier is the transmission timing of the SSB within its respective SSB burst set, or the transmission timing of the SSB within multiple SSB burst sets within a preset time range.

17. The synchronization signal transmission method according to claim 12 or 16, characterized in that, The SSB burst set index identifier: the transmission timing of the SSB burst set within a preset time range.

18. The synchronization signal transmission method according to any one of claims 12 to 17, characterized in that, The network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including: Network devices transmit the Physical Broadcast Channel (PBCH); The PBCH includes: an SSB index information field, and / or an SSB burst set index information field; the SSB index is carried in the SSB index information field, and the SSB burst set index is carried in the SSB burst set index information field. or The SSB index and / or the SSB burst set index are carried in the main information block (MIB) of the higher-layer broadcast channel BCCH-BCH of the PBCH.

19. The synchronization signal transmission method according to any one of claims 12 to 17, characterized in that, The network device transmits a synchronization signal SS and a physical broadcast channel PBCH, including: The network device transmits a synchronization signal SS and a physical broadcast channel PBCH; the SS and PBCH include the PBCH demodulation reference signal DM-RS. PBCH DM-RS includes pre-labeled target DM-RS; The generated sequence of the target DM-RS carries the SSB index and / or SSB burst set index of the SSB.

20. The synchronization signal transmission method according to any one of claims 12 to 19, characterized in that, The offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group is the product of the SSB burst set index and the preset basic offset.

21. The synchronization signal transmission method according to any one of claims 16 to 20, characterized in that, The SSB index identifies the transmission timing of multiple SSB burst sets within a preset time range, including: The SSB index identifies the absolute time position of the SSB relative to the synchronization cycle reference point of the current cell group or base station group within a preset time range.

22. The synchronization signal transmission method according to any one of claims 16 to 20, characterized in that, The SSB index identifier: The transmission timing of the SSB within its respective SSB burst set, including: The SSB index identifies the relative transmission timing of the SSB within its respective SSB burst set; The absolute time position of the SSB from the synchronization cycle reference point of the current cell group or base station group within a preset time range is determined by the SSB burst set index and the SSB index.

23. The synchronization signal transmission method according to claim 20, characterized in that, The method further includes: The UE determines the offset of the SSB burst set from the synchronization period reference point of the current cell group or base station group based on the product of the SSB burst set index and the preset basic offset.

24. The synchronization signal transmission method according to claim 21, characterized in that, The method further includes: The UE determines the absolute time position of the SSB within a preset time range and from the synchronization cycle reference point of the current cell group or base station group based on the SSB index identifier.

25. The synchronization signal transmission method according to claim 22, characterized in that, The method further includes: The UE determines, based on the SSB burst set index and the SSB index, the absolute time position of the SSB within a preset time range from the synchronization cycle reference point of the current cell group or base station group.

26. A network device, characterized in that, The network device includes: The sending module is used to send SS and PBCH. The SS and PBCH include index information; The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

27. A user equipment, characterized in that, The user equipment includes: The receiving module is used to receive SS and PBCH signals sent by network devices. The SS and PBCH include index information; The index information includes: the Synchronization Signal Block (SSB) index, and / or the SSB burst set index.

28. A network device, characterized in that, include: One or more processors; The network device is used to perform the synchronization signal transmission method according to any one of claims 1 to 11.

29. A user equipment, characterized in that, include: One or more processors; The user equipment is used to perform the synchronization signal transmission method according to any one of claims 12 to 25.

30. A communication system, characterized in that, It includes network equipment and user equipment; wherein the network equipment is configured to implement the synchronization signal transmission method according to any one of claims 1 to 11, and the user equipment is configured to implement the synchronization signal transmission method according to any one of claims 12 to 25.

31. A storage medium storing instructions, characterized in that, When the instruction is executed on the communication device, the communication device performs the synchronization signal transmission method as described in any one of claims 1 to 11, or performs the synchronization signal transmission method as described in any one of claims 12 to 25.

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