A communication method, apparatus, storage medium, and program product

Abstract

The embodiment of the disclosure provides a communication method, device, storage medium and program product, relates to the technical field of communication, and can improve the receiving performance of a synchronization signal in a dense cell scenario or a distributed scenario. The method is applied to a first communication node, and includes the following steps: determining N synchronization signals, the N synchronization signals belong to a same first synchronization signal set, the first synchronization signal set includes Q synchronization signals, N is a positive integer greater than or equal to 1, and Q is a positive integer greater than or equal to N; and sending a first signal to a second communication node, wherein the first signal includes related information about the N synchronization signals.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a communication method, apparatus, storage medium, and program product. Background Technology

[0002] Currently, in wireless communication systems, cell search and identification can be achieved between transmitting and receiving nodes (such as between base stations and terminals) through synchronization signals, and the synchronization signals sent by different transmitting nodes are independent of each other.

[0003] However, as residential communities become more densely populated in the future, the number of synchronization signals will also increase, leading to increased interference between synchronization signals.

[0004] Therefore, how to reduce interference between synchronization signals in densely populated or distributed scenarios and effectively improve the reception performance of synchronization signals has become a pressing technical problem. Summary of the Invention

[0005] This disclosure provides a communication method, apparatus, storage medium, and program product that can improve the reception performance of synchronization signals in dense cell scenarios or distributed scenarios.

[0006] On the one hand, a communication method is provided, which is applied to a first communication node, comprising: determining N synchronization signals, the N synchronization signals belonging to the same first synchronization signal set, the first synchronization signal set including Q synchronization signals, N being a positive integer greater than or equal to 1, and Q being a positive integer greater than or equal to N; and sending a first signal to a second communication node, the first signal including relevant information about the N synchronization signals.

[0007] On another front, a communication method is provided, which is applied to a second communication node and includes: receiving a first signal sent by a first communication node; wherein the first signal includes information about N synchronization signals, the N synchronization signals belong to the same first synchronization signal set, the first synchronization signal set includes Q synchronization signals, N is a positive integer greater than or equal to 1, and Q is a positive integer greater than or equal to N.

[0008] On the other hand, a communication device is provided for use in a first node, the device comprising: a processing module and a transmitting module.

[0009] The processing module is used to determine N synchronization signals, which belong to the same first synchronization signal set. The first synchronization signal set includes Q synchronization signals, where N is a positive integer greater than or equal to 1 and Q is a positive integer greater than or equal to N. The sending module is used to send a first signal to the second communication node, which includes relevant information about the N synchronization signals.

[0010] On the other hand, a communication device is provided for use in a second node, the device comprising: a receiving module.

[0011] The receiving module is used to receive a first signal sent by the first communication node; wherein the first signal includes relevant information about N synchronization signals, the N synchronization signals belong to the same first synchronization signal set, the first synchronization signal set includes Q synchronization signals, N is a positive integer greater than or equal to 1, and Q is a positive integer greater than or equal to N.

[0012] In another aspect, a communication device is provided, comprising: a memory and a processor. The memory and the processor are coupled. The memory is used to store a computer program. When the processor executes the computer program, it implements the communication method of any of the above embodiments.

[0013] In another aspect, a computer-readable storage medium is provided, on which computer program instructions are stored, which, when executed by a processor, implement the communication method of any of the above embodiments.

[0014] In another aspect, a computer program product is provided, which includes computer program instructions that, when executed, implement the communication method of any of the above embodiments.

[0015] This disclosure provides considerations for synchronization signal transmission schemes in dense cell scenarios, taking into account factors such as synchronization signal load, interference, spatial attenuation, spatial gain, and the detection complexity of the synchronization signal at the receiver. This effectively improves the reception performance of synchronization signals in dense cell scenarios, making it suitable not only for dense cell scenarios but also for distributed scenarios. Furthermore, in distributed scenarios, terminals can quickly locate one or more serving cells. Here, distributed scenarios include situations where one receiver needs to communicate with multiple transmitters, or multiple transmitters need to negotiate resources for communication transmission. Additionally, transmission schemes for common channels in dense cell or distributed scenarios are also provided to improve the reception performance of common channels. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings.

[0017] Figure 1 A schematic diagram of a communication system provided for some embodiments of this disclosure;

[0018] Figure 2This is a schematic diagram illustrating the transmission of synchronization signals by three access points (APs) according to some embodiments of this disclosure.

[0019] Figure 3 A flowchart illustrating a communication method provided in some embodiments of this disclosure;

[0020] Figure 4 This is a schematic diagram illustrating an example of a time-frequency resource set corresponding to a synchronization signal transmitted by three APs, provided in some embodiments of this disclosure.

[0021] Figure 5 This is a schematic diagram illustrating an example of the structure of a plurality of synchronization signal blocks and each synchronization signal block, provided in some embodiments of this disclosure.

[0022] Figure 6 This is a schematic diagram illustrating an example of the structure of another plurality of synchronization signal blocks provided in some embodiments of the present disclosure, and the structure of each synchronization signal block;

[0023] Figure 7 This disclosure provides an example of multiple synchronization signal blocks, the structural composition of each synchronization signal block, and a schematic diagram illustrating the transmitting node and transmitting beam corresponding to the synchronization signal in some embodiments.

[0024] Figure 8 This is a schematic diagram illustrating an example of the structure of another plurality of synchronization signal blocks provided in some embodiments of the present disclosure, and the structure of each synchronization signal block;

[0025] Figure 9 This is a schematic diagram illustrating an example of multiple access points (APs) sending the same synchronization signal, with the same synchronization signal corresponding to multiple quasi-co-located areas, provided in some embodiments of this disclosure.

[0026] Figure 10 A flowchart illustrating another communication method provided in some embodiments of this disclosure;

[0027] Figure 11 A flowchart illustrating another communication method provided in some embodiments of this disclosure;

[0028] Figure 12 A schematic diagram of the structure of a communication device provided in some embodiments of this disclosure. Figure 1 ;

[0029] Figure 13 A schematic diagram of the structure of a communication device provided in some embodiments of this disclosure. Figure 2 ;

[0030] Figure 14 A schematic diagram of the structure of a communication device provided in some embodiments of this disclosure. Figure 3 . Detailed Implementation

[0031] The technical solutions of this disclosure will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0032] It should be noted that, in this disclosure, the terms "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in this disclosure should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0033] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0034] In the description of this disclosure, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Furthermore, "at least one" means one or more, and "more than one" means two or more.

[0035] Currently, in wireless communication systems, cell search and identification can be achieved between transmitting and receiving nodes (such as between base stations and terminals) through synchronization signals, and the synchronization signals sent by different transmitting nodes are independent of each other.

[0036] However, as cell networks become increasingly dense, the number of synchronization signals also increases, leading to increased interference between these signals. Furthermore, in distributed scenarios, terminals need to identify multiple serving cells (also known as service reception).

[0037] Therefore, how to effectively improve the reception performance of synchronization signals in densely populated cell scenarios, and how to enable terminals to quickly select multiple serving cells in distributed scenarios, have become urgent technical problems to be solved.

[0038] Based on this, to solve the aforementioned technical problems, this disclosure provides a communication method applied to the transmission of synchronization signals. By considering the load, interference, spatial attenuation, spatial gain, and detection complexity of the synchronization signal at the receiver, it provides factors that need to be considered in the transmission scheme of synchronization signals in dense cell scenarios. This effectively improves the reception performance of synchronization signals in dense cell scenarios, making it suitable not only for dense cell scenarios but also for distributed scenarios. Furthermore, in distributed scenarios, terminals can quickly find one or more serving cells. Here, a distributed scenario includes situations where one receiver needs to communicate with multiple transmitters, or multiple transmitters need to negotiate resources for communication transmission. In addition, a transmission scheme for a common channel in dense cell or distributed scenarios is also provided to improve the reception performance of the common channel.

[0039] In this embodiment of the disclosure, the network architecture of the mobile communication network (including but not limited to 2G, 3G, 4G, 5G and future mobile communication networks (such as the evolution of the fifth generation mobile communication technology (5G-A), the sixth generation mobile communication technology (6G)), and the seventh generation mobile communication technology (7G)) may include at least a first communication node and a second communication node, which may be referred to as the first node and the second node, respectively.

[0040] For example, such as Figure 1 The diagram shown is a schematic of a communication system provided in an embodiment of this disclosure. The communication system may include: a first communication node 101 and a second communication node 102.

[0041] The first communication node 101 can receive multiple synchronization signals and identify N synchronization signals belonging to the same first synchronization signal set from among the multiple synchronization signals. Then, the first communication node 101 can send the relevant information of these N synchronization signals to the second communication node 102 through a first signal.

[0042] The second communication node 102 determines the reception status of the synchronization signals by the first communication node 101, and / or determines the information of the N synchronization signals selected by the first communication node, and / or determines the supercell index where the first communication node is located by receiving a first signal carrying relevant information of N synchronization signals sent by the first communication node 101.

[0043] It should be noted that, in this embodiment of the disclosure, the N synchronization signals can be downlink synchronization signals.

[0044] Furthermore, the second communication node 102 can be a sending node corresponding to these N synchronization signals; or, the second communication node 102 can be a node other than these N synchronization signals.

[0045] In this embodiment of the disclosure, the first communication node 101 can be a receiving node, such as a passive IoT device, tag, or terminal. The second communication node 102 can be a sending node, such as a base station, auxiliary node, or intermediate node.

[0046] In this context, a base station (BS) can be a base station in LTE, Long Term Evolution Advanced (LTEA) or an evolved Node B (eNB or eNodeB), a base station device (gNB) in a 5G network, or a base station in a future communication system. Base stations can include various macro base stations, micro base stations, femtocell base stations, wireless remote extensions, reconfigurable intelligent surfaces (RISS), routers, relay stations, transmission and reception points (TRPs), receivers, access points (APs), wireless fidelity (Wi-Fi) devices, and other network-side equipment. A base station can sometimes also be referred to as a reader or reader used for communication with terminals.

[0047] A terminal can be a device with wireless transceiver capabilities. Terminals can be mobile phones, tablets, computers with wireless transceiver capabilities, virtual reality (VR) terminals, augmented reality (AR) terminals, wireless terminals in industrial control, wireless terminals in self-driving vehicles, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and so on. The embodiments of this disclosure do not limit the application scenarios. A terminal may also be referred to as a user, user equipment (UE), A-IoT device, access terminal, UE unit, UE station, mobile station, mobile station, remote station, transmitter, remote terminal, mobile device, UE terminal, wireless communication device, UE agent, or UE device, etc., and the embodiments of this disclosure do not limit this to these terms.

[0048] In some embodiments, the number of second communication nodes 102 can be multiple.

[0049] For example, such as Figure 2 As shown, taking three access points (APs) as an example, AP1 transmits signals using beam 1, AP2 uses beam 2, and AP3 uses beam 3. The signal model between the three APs and the terminal can be any of the following four models:

[0050] Signal Model 1: Y(x,y,z,k)=(H1(x,y,z,k)+H2(x,y,z,k)+H3(x,y,z,k))·s(k) Formula 1;

[0051] Signal Model 2: Y(x,y,z,k)=H1(x,y,z,k)·s1(k)+H2(x,y,z,k)·s2(k)+H3(x,y,z,k)·s3(k) Formula 2;

[0052] Signal Model 3: Y(x,y,z,k) i )=H i (x,y,z,k i )·s i (k i Formula 3, i = 1, 2, 3;

[0053] Signal Model 4: Y(x,y,z,k) i)=H i (x,y,z,k i )·s(k i Formula 4, i = 1, 2, 3.

[0054] Where H i (x,y,z,k), i=1,2,3 represents the channel response from APi to the receiver at spatial location (x,y,z) in the RE with resource element (RE) index k, where k=0,1,2...., and k is the index of one of the multiple time-frequency resource REs occupied by the channel or signal. s(k) represents the modulation symbol transmitted on the RE with index k. i (k) represents the modulation symbol corresponding to the i-th channel or signal on the RE with index k, where the signal includes at least one of the following: a demodulation reference signal for the common channel, a data signal for the common channel, or a synchronization signal. When the above signal model is used for the demodulation reference signal of the common channel below, s(k),s i (k),s i (k i ),s(k i ) is the demodulation reference signal for the common channel. When the above signal model is used for the data signal of the common channel, s(k),s i (k),s i (k i ),s(k i ) represents the data signal of the common channel. When the above signal model is used for synchronization signals, s(k), s i (k),s i (k i ),s(k i () is the synchronization signal.

[0055] In signal model 3, signals from different APs are transmitted on different time-frequency resources, where k i It is the time-frequency resource index occupied by the i-th signal, and the modulation symbol set s of the three signals. i (k i The differences between signal model 4 and signal model 3 are that the modulation symbol set of the three signals is the same, which is s(k). i ), only at different time-frequency resources k i Send from above. k = 0, 1, ..., N-1, k i =0,1,...N-1, where N is the number of REs occupied by the signal.

[0056] In signal model 1, P APs transmit the same modulation symbol s(k) on the same time-frequency resource k. In signal model 2, three APs transmit different modulation symbols s on the same time-frequency resource k. i(k). Different modulation symbols correspond to different reference signals and / or different spatial resources, such as different access points (APs), or different precoding methods for the same AP or the same group of APs. Simply put, P spatial resources can transmit P modulation symbols on the same time-frequency resource k. These P modulation symbols arrive at the receiver via different spatial paths. If the spatial path discrimination is good enough, the receiver can successfully detect P modulation symbols on the same time-frequency resource k. Here, the P modulation symbols can be P synchronization signal modulation symbols, P common channel demodulation reference signal modulation symbols, or P common channel data modulation symbols. The P modulation symbols can include the same and / or different modulation symbols.

[0057] Signal model 1 leads to unstable reception performance of signal s(k) because the power of H1(x,y,z,k)+H2(x,y,z,k)+H3(x,y,z,k) varies at different (x,y,z) coordinates: at some (x,y,z) coordinates, the three channels are positively superimposed, resulting in very high received power for H1(x,y,z,k)+H2(x,y,z,k)+H3(x,y,z,k); at other (x,y,z) coordinates, the three channels are negatively superimposed, resulting in very low received power for H1(x,y,z,k)+H2(x,y,z,k)+H3(x,y,z,k)+H3(x,y,z,k)+H3(x,y,z,k). This phenomenon can be called spatial deep attenuation.

[0058] Signal model 2 does not involve the superposition of multiple channels, so signal s i (k) has better reception stability than signal model 1. However, in signal model 1, the optimal gain of the three channels can be obtained when they are positively superimposed. For example, assuming the average amplitude of each of the three channels is 1, the maximum power of the superimposed channel of the three APs in signal model 1 is 3. 2 =9, but when negative phases are superimposed, the gain may be 0. In signal model 2, a diversity gain of 3 with an average channel power can always be obtained.

[0059] In signal models 3 and 4, the signals from the three APs are transmitted on different time-frequency resources. i (k i Signal model 4, compared to signal model 3, transmits the same modulation symbol s(k) on different time-frequency resources. i This reduces the detection complexity of the terminal and allows for the merging of signals from three time-frequency positions to achieve merging gain, improving the detection performance of modulation symbols. Furthermore, this merging can be performed before demodulating the modulation symbols, further reducing terminal complexity. If the signal is a common channel data signal, and P signals contain the same pre-channel encoded information bits but different modulation symbols (e.g., in signal model 2, for different i, s...),... i(k) are different, but s i (k) The set includes the same information bits c(j) before channel coding, and signal model 3, for different i, s i (k i ) are different, but s i (k i The set includes the same information bits c(j) before channel coding. The terminal can also combine P signals, but the combination is performed after modulation and before channel decoding. The combined information is sent to a channel decoder. That is, the combination at this time is bit-level combination before channel decoding. Therefore, the terminal should combine them before demodulation, as in signal model 4.

[0060] Formulas 1-4 use P=3 as an example and can be generalized to any P, as in Formulas 5-8:

[0061] Signal Model 1:

[0062] Signal Model 2:

[0063] Signal Model 3: Y(x,y,z,k) i )=H i (x,y,z,k i )·s i (k i Formula 7, i = 0, 1, 2, 3... P-1;

[0064] Signal Model 4: Y(x,y,z,k) i )=H i (x,y,z,k i )·s(k i Formula 8, where i = 0, 1, 2, 3...P-1. It should be noted that... Figure 1 This is just an example framework diagram. Figure 1 The number of devices included and the names of each device are unlimited, except for... Figure 1 In addition to the devices shown, the communication system may also include other devices, such as core network equipment.

[0065] The application scenarios of the embodiments disclosed herein are not limited. The system architecture and business scenarios described in the embodiments of this disclosure are for the purpose of more clearly illustrating the technical solutions of the embodiments of this disclosure, and do not constitute a limitation on the technical solutions provided by the embodiments of this disclosure. As those skilled in the art will know, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of this disclosure are also applicable to similar technical problems.

[0066] Figure 3 A flowchart of a communication method is shown, such as... Figure 3 As shown, this communication method is applied to the first communication node and includes:

[0067] S301. Determine N synchronization signals.

[0068] Among them, N synchronization signals belong to the same first synchronization signal set, which includes Q synchronization signals, where N is a positive integer greater than or equal to 1, and Q is a positive integer greater than or equal to N.

[0069] In some embodiments, the Q synchronization signals include at least one first synchronization signal, wherein each first synchronization signal corresponds to multiple quasi-co-located regions, and a quasi-co-located region includes one or more transmission opportunities of the first synchronization signal; wherein, in the case of multiple transmission opportunities, the multiple transmitters are located differently in the time domain and / or frequency domain, and the first synchronization signals on the multiple transmission opportunities satisfy a quasi-co-located relationship.

[0070] As one possible implementation, Q synchronization signals can occupy more than one synchronization signal block.

[0071] Among them, the synchronization signal sequences corresponding to the Q synchronization signals are the same, and / or the main synchronization signal sequences corresponding to the Q synchronization signals are the same.

[0072] As another possible implementation, the Q synchronization signals belong to the same synchronization signal block.

[0073] In this embodiment of the disclosure, at least two of the Q synchronization signals have different primary synchronization signals.

[0074] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and the number of sequences in the candidate sequence set of the primary synchronization signal is greater than 3.

[0075] Optionally, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and satisfies at least one of the following characteristics:

[0076] The transmission bandwidth occupied by a master synchronization signal is greater than the preset value;

[0077] A primary synchronization signal occupies a discontinuous subcarrier;

[0078] The number of subcarriers occupied by a master synchronization signal is determined by Q;

[0079] The subcarrier spacing of a master synchronization signal is determined based on Q;

[0080] The number of sequences included in the candidate master synchronization signal sequence set is determined based on Q.

[0081] Among them, the transmission bandwidth occupied by a master synchronization signal is greater than a preset value, including:

[0082] The number of subcarriers occupied by a primary synchronization signal is greater than the preset value, which is 127.

[0083] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal. The primary and secondary synchronization signals in each synchronization signal are located in the same synchronization signal block (i.e., each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal in a synchronization signal block). The synchronization signal block includes multiple transmission opportunities for primary synchronization signals. One of the transmission opportunities for a primary synchronization signal is a resource set occupied by the primary synchronization signal. The transmission opportunities for multiple primary synchronization signals occupy multiple resource sets respectively. The resources include at least one of the following: time-domain resources and frequency-domain resources. The Q synchronization signals are located in one or more synchronization signal blocks.

[0084] As one possible implementation, in a synchronization signal block, the number of transmission opportunities for the primary synchronization signal is greater than the number of transmission opportunities for the secondary synchronization signal.

[0085] It should be noted that the synchronization signal block satisfies at least one of the following:

[0086] The relative positions of the transmission opportunities of multiple primary synchronization signals and secondary synchronization signals in a synchronization signal block are predetermined; or,

[0087] In multiple synchronization signal blocks, the relative positions of the transmission opportunities of the multiple primary synchronization signals and the transmission opportunities of the secondary synchronization signals are the same.

[0088] In addition, the synchronization signal block can also satisfy at least one of the following:

[0089] A synchronization signal block includes at least two transmission opportunities for the primary synchronization signal and only one transmission opportunity for the secondary synchronization signal.

[0090] The transmission opportunities of multiple master synchronization signals in a synchronization signal block are occupied by different synchronization signals respectively;

[0091] In a synchronization signal block, multiple master synchronization signals each occupy different transmission opportunities among the multiple master synchronization signal transmission opportunities;

[0092] Multiple master synchronization signals in a synchronization signal block occupy different master synchronization signal sequences in the transmission opportunity of a master synchronization signal;

[0093] The number of candidate synchronization signals corresponding to a synchronization signal block is determined based on the number of primary synchronization signal sequences, the number of secondary synchronization signal sequences, and the number of transmission opportunities for multiple primary synchronization signals;

[0094] A synchronization signal block corresponds to a candidate synchronization signal set, and a candidate synchronization signal set includes at least one second synchronization signal set, wherein the first synchronization signal set is one of the at least one second synchronization signal set.

[0095] As another possible implementation, the Q synchronization signals include at least two synchronization signals, and the at least two synchronization signals each occupy the transmission opportunity of a different master synchronization signal in a synchronization signal block.

[0096] Optionally, the first index of a synchronization signal in the synchronization signal block is determined based on the index of the main synchronization signal sequence, the index of the auxiliary synchronization signal sequence, and the index of the transmission opportunity of the main synchronization signal.

[0097] Wherein, the first index is the physical cell index; and / or the first index is the index of a synchronization signal among multiple synchronization signals corresponding to a synchronization signal block.

[0098] Furthermore, the second index of a synchronization signal is determined based on the first index and the index of the synchronization signal block corresponding to the synchronization signal, or a synchronization signal is determined based on the first index and the index of the synchronization signal block corresponding to the synchronization signal.

[0099] Furthermore, the transmission opportunities of multiple master synchronization signals corresponding to the same first index in multiple different synchronization signal blocks are the same, wherein the transmission opportunity index of the master synchronization signal is the index of the transmission opportunity of the master synchronization signal in the multiple transmission opportunities included in a synchronization signal block.

[0100] S302, Send the first signal to the second communication node.

[0101] The first signal includes relevant information about the N synchronization signals.

[0102] As one possible implementation, the first signal can satisfy at least one of the following:

[0103] The first signal includes the signal during the random access phase;

[0104] The first signal includes the index information of each of the N synchronization signals;

[0105] There is a pre-defined correspondence between the index information of the first signal and the N synchronization signals.

[0106] Understandably, by associating multiple synchronization signals, the characteristics of the N synchronization signals selected by the terminal are constrained, reducing interference between different synchronization signals. On the one hand, this reduces the complexity of blind detection at the terminal; on the other hand, it allows for the comprehensive consideration of synchronization signals that are relatively close and subject to greater interference, taking into account factors such as spatial attenuation, multi-antenna gain, interference, complexity, and terminal detection complexity, and adopting a suitable synchronization signal transmission scheme.

[0107] In some embodiments, before determining the N synchronization signals (i.e., before S301), the communication method provided in this disclosure may further include at least one of the following:

[0108] The first communication node receives first indication information from the second communication node. The first indication information is used to indicate the characteristics satisfied by Q synchronization signals, so that the first communication node determines the first set of synchronization signals according to the first indication information.

[0109] Receive second indication information from the second communication node, the second indication information including information of the synchronization signals included in the first synchronization signal set;

[0110] Based on the transmission resources where the N synchronization signals are located, a first set of synchronization signals is determined. The transmission resources include at least one of the following: time-domain resources, frequency-domain resources, and code-domain resources. This action can also be performed during step S301, but before determining the N communication signals, it can be agreed on how to determine the first set of synchronization signals based on the transmission resources where the N synchronization signals are located.

[0111] As one possible implementation, before determining the N synchronization signals (i.e., before S301), the first communication node can first determine multiple sets of second synchronization signals, which include the first synchronization signal set. Then, based on the aforementioned first indication information, second indication information, and the transmission resources where the synchronization signals are located, the first communication node determines the first synchronization signal set and further determines the N synchronization signals.

[0112] Among them, the multiple sets of second synchronization signals can satisfy at least one of the following:

[0113] The synchronization signals in multiple sets of second synchronization signals reside on a single carrier wave;

[0114] The synchronization signals in multiple sets of second synchronization signals are located in a synchronization signal frequency domain search grid;

[0115] The set of multiple second synchronization signals is determined based on the transmission resources where the N synchronization signals are located;

[0116] The first synchronization signal set among multiple second synchronization signal sets is selected by the first communication node.

[0117] In this embodiment of the disclosure, the different synchronization signals among the Q synchronization signals can satisfy at least one of the following:

[0118] The main synchronization signal sequences are different between different synchronization signals;

[0119] The auxiliary synchronization signal sequences are different between different synchronization signals;

[0120] The transmission opportunities of the primary synchronization signal differ between different synchronization signals.

[0121] In addition, the Q synchronization signals are located in one carrier; or, the Q synchronization signals are located in one synchronization signal frequency domain search grid.

[0122] In some embodiments, N synchronization signals correspond to A common channel demodulation reference signals, where A is a positive integer less than or equal to N; and / or, Q synchronization signals correspond to P common channel demodulation reference signals, where P is a positive integer less than or equal to Q.

[0123] Wherein, A common channel demodulation reference signals belong to P common channel demodulation reference signals; and / or,

[0124] The common channel data corresponding to the P common channel demodulation reference signals include the same common information; and / or,

[0125] Each of the Q synchronization signals corresponds to one of the P common channel demodulation reference signals, and each of the P common channel demodulation reference signals corresponds to one or more synchronization signals in the Q synchronization signals.

[0126] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and an auxiliary synchronization signal in a synchronization signal block, wherein one synchronization signal block and another synchronization signal block correspond to the same auxiliary synchronization signal transmission opportunity, and the transmission opportunity of the auxiliary synchronization signal is a set of resources occupied by the auxiliary synchronization signal, wherein the resources include at least one of the following: time domain resources, frequency domain resources, and the Q synchronization signals are located in one or more synchronization signal blocks.

[0127] The following section uses three APs as an example and introduces various schemes (Scheme 1-Scheme 7) that can be used for synchronization signals, along with specific implementation examples.

[0128] Option 1: Three access points (APs) transmit the same synchronization signal on the same time-frequency resources. That is, the same synchronization signal is transmitted simultaneously by all three APs. The received signal model at the receiver located at spatial position (x,y,z) is as shown in Formula 1 above. Figure 4 As shown in (a), s(k) is the synchronization signal sent by 3 APs on resource k (i.e., a synchronization signal block includes one SS).

[0129] Option 2: Each of the three access points (APs) sends a synchronization signal, and these three synchronization signals occupy the same time-frequency resources, only their corresponding sequences are different. The receiving signal model of the receiver located at spatial location (x,y,z) at time-frequency resource k is as shown in Formula 2 above. Figure 4 As shown in (b) above, s i (k), i = 1, 2, 3 are the synchronization signals sent by APi on resource k (i.e., a synchronization signal block includes 3 SS (such as SS1, SS2 and SS3)).

[0130] Option 3: Each of the three access points (APs) sends a synchronization signal, and the three synchronization signals of these three APs occupy at least one of the time-domain resources and / or frequency-domain resources differently. The receiver located at spatial location (x,y,z) has different time-frequency resources k. i The received signal model at the location is shown in Formula 3 above. The synchronization signal sequences in Formula 3 are s1(k) i ),s2(k i ),s3(k i ), s i (k i ) is APi in resource k i The synchronization signal sent from above.

[0131] Option 4: The difference between Option 4 and Option 3 is that s1(k i ),s2(k i ),s3(k i ) is the same and can be replaced with s(k) i ), that is, s1(k i )=s2(k i )=s3(k i That is, although the synchronization signals of the three APs occupy different time-frequency resources k i However, they correspond to the same sequence. As shown in Formula 4 above. s(k i ) is APi in resource k i The synchronization signal sent from above.

[0132] It should be noted that in Schemes 3 and 4, since the synchronization signals of the three APs occupy different time-frequency resources, the synchronization signal sequences can be the same or different; even if they are the same, they can still be distinguished. In Scheme 3, their sequences are different, while in Scheme 4, their sequences are the same. Compared to Scheme 3, Scheme 4 can reduce the terminal search complexity because the terminal searches for the synchronization signal within a time window, so the search complexity is the number of sequences multiplied by the number of search points. If s1(k i )=s2(k i )=s3(k i If ), then the number of search sequences does not increase. For example... Figure 4 As shown in (c), SS1 and SS2 are code division schemes of scheme 2, and SS3 is in different time domain resources than SS1 and SS2 (i.e., synchronization signal block 1 includes SS1 and SS2, and synchronization signal block 2 includes SS3). Figure 4 In the diagram, (c) represents a combination of schemes 2 and 3. SS1 and SS2 use the code division multiplexing method of scheme 2, while {SS1, SS2} and SS3 use either scheme 3 or scheme 4. It is also possible that SS1, SS2, and SS3 occupy three different time-domain resources, i.e., SS1, SS2, and SS3 share three synchronization signal blocks.

[0133] Furthermore, in Scheme 1, three APs correspond to only one synchronization signal. In Scheme 2, three APs correspond to three synchronization signals but share a time-frequency resource (also known as a time-frequency resource set or the time-frequency resource occupied by a synchronization signal block), only corresponding to different code domain resources. In Scheme 3, three APs correspond to three synchronization signals and more than one time-frequency resource, with their synchronization signal load increasing sequentially from Scheme 1 to Scheme 3. However, Scheme 1 leads to unstable reception performance of the synchronization signal because the power of H1(x,y,z,k)+H2(x,y,z,k)+H3(x,y,z,k) differs at different (x,y,z) locations. At some (x,y,z) locations, the three channels are positively superimposed, resulting in strong received power of the synchronization signal; at other (x,y,z) locations, the three channels are negatively superimposed, resulting in very low received power of the synchronization signal. This phenomenon is called the spatial deep fading problem. In the positive superposition position, the optimal performance of these three channels can be obtained. For example, if the average amplitude of each channel is 1, then when the three channels are positively superimposed, the maximum amplitude of the sum of the three channels can reach 3, so the power can be 9. However, in the negative superposition position, the minimum amplitude of the sum of the three channels may be 0. This results in a significant difference in the reception performance of the synchronization signal at different spatial locations within the coverage area of ​​these three APs. Consequently, terminals at some locations cannot receive the synchronization signal, while the reception performance of the synchronization signal is particularly high at other locations. This also makes it difficult for the base station to control the transmission power of the synchronization signal.

[0134] Schemes 2 through 4 do not involve the superposition of multiple channels, so the measurement stability of the synchronization signal is better than that of Scheme 1. Compared to Scheme 2, Scheme 3 has less interference between synchronization signals. Compared to Scheme 2, although Scheme 4 occupies more time-frequency resources for synchronization signals, the terminal's synchronization signal search complexity is less than that of Scheme 2. This is because the search complexity of synchronization signals is measured by multiplying the number of synchronization signal sequences by the number of search points. In Scheme 2, the number of synchronization signal sequences increases to 3. Here, the search complexity of synchronization signals is measured by assuming that the terminal first scans all time points based on one synchronization signal sequence, and then scans the time points of another synchronization signal. If the terminal scans all synchronization signal sequences at each time point, then the search complexity of Schemes 3 and 4 is comparable.

[0135] Each of the above synchronization signals may include a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), such as... Figure 5 As shown, both synchronization signal block 1 and synchronization signal block 2 include one PSS and one SSS. However, in scheme 2, the number of main synchronization signals in each synchronization signal block is limited, for example, only 3 main synchronization signals. When the number of APs is greater than 3, the main synchronization signals will still suffer from the spatial deep attenuation problem of scheme 1. Therefore, one or more of the following schemes 5 to 7 can be adopted:

[0136] Method 5: Increase the number of primary synchronization signal sequences in the synchronization signal block. However, this increases the search complexity of the terminal, for example, increasing the number of primary synchronization signal sequences to more than 3. This increases the synchronization signal detection complexity of the terminal, and in order to achieve orthogonality of different primary synchronization signal sequences, the bandwidth of the frequency domain resources occupied by the primary synchronization signals also needs to be increased. Generally, the terminal will first blindly detect the primary synchronization signal within a time window to obtain initial time information, and then detect the secondary synchronization signal. The detection complexity of the primary synchronization signal is the number of synchronization signal sequences multiplied by the number of search start time points. Therefore, increasing the number of primary synchronization signal sequences will directly increase the complexity of the terminal's detection of the primary synchronization signal.

[0137] Option 6: Channel estimation is performed in the time domain using the primary synchronization signal. If the time-domain taps obtained from the synchronization signal have good time-domain distinguishability, the impact of spatial deep fading will be reduced. Therefore, the bandwidth occupied by the primary synchronization signal can be increased to enhance the time-domain distinguishability of channel estimation, thereby reducing time-domain merging of channels from multiple APs. For example, in distributed communication mode and / or high-frequency mode, the bandwidth occupied by the synchronization signal is greater than in single-node communication mode or low-frequency mode because spatial deep fading is more severe in high-frequency mode. Alternatively, the primary synchronization signal can occupy subcarriers in a comb structure instead of consecutive subcarriers. For example, in one time-domain symbol, the primary synchronization signal occupies one subcarrier every C subcarriers in a subcarrier set, where C is a positive integer greater than 1.

[0138] Option 7: Of the P synchronization signals, some primary synchronization signals use time-division or frequency-division multiplexing, some primary synchronization signals use code-division multiplexing, and the P secondary synchronization signals use code-division multiplexing. For example... Figure 6 As shown, a two-time-division primary synchronization signal transmission opportunity corresponds to a one-code-division secondary synchronization signal transmission opportunity. That is, both synchronization signal block 1 and synchronization signal block 2 can include two PSSs and one SSS. In this case, the physical cell index acquisition includes the primary synchronization signal sequence index, the secondary synchronization signal sequence index, and the index of the primary synchronization transmission opportunity. For example... Figure 6 Assuming there are 3 primary synchronization signal sequences and 336 secondary synchronization signal sequences, then there are 3 * 336 * 2 = 2016 physical cell indices. The number 2 represents the number of opportunities for primary synchronization signal transmission. Figure 6 The three time-domain symbols constitute a synchronization signal block, and a physical cell can correspond to multiple time-division synchronization signal blocks. Figure 6 The document defines two synchronization signal blocks, each corresponding to different quasi-co-address parameters. Synchronization signals within different synchronization signal blocks do not satisfy quasi-co-address relationships; for example, different synchronization signal blocks may correspond to different transmission beams in each physical cell. A synchronization signal occupies only one of the multiple primary synchronization signal transmission opportunities within a synchronization signal block. A physical cell occupies only one of the multiple primary synchronization signal transmission opportunities within a synchronization signal block. Figure 6 A synchronization signal block includes two primary synchronization signal transmission opportunities. One primary synchronization signal transmission opportunity represents one time-domain symbol occupied by a primary synchronization signal. However, this embodiment does not exclude the possibility that one primary synchronization signal transmission opportunity represents multiple time-domain symbols occupied by a primary synchronization signal; for example, the unit of one transmission opportunity may be multiple time-domain symbols. Having one transmission opportunity corresponding to one time-domain symbol can reduce the load on the time-frequency resources occupied by the primary synchronization signal, while occupying multiple time-domain symbols can increase the coverage of the primary synchronization signal. Figure 5In the traditional synchronization signal scheme shown, a synchronization signal block includes two time-domain symbols, used for the transmission of the primary synchronization signal and the secondary synchronization signal, respectively. The transmission timing of one secondary synchronization signal and the transmission timing of one primary synchronization signal constitute a synchronization signal block, as shown below. Figure 5 As shown, the index acquisition parameters for a physical cell at this time only include the primary synchronization signal sequence index and the secondary synchronization signal sequence index, excluding the index of the primary synchronization transmission opportunity. A physical cell can include synchronization signals from multiple synchronization signal blocks. Synchronization signals from different synchronization signal blocks within the same physical cell are distinguished by the synchronization signal block index and transmitted by different transmit beams. Different beams (especially different radio frequency beams) within a physical cell cannot be transmitted in the same synchronization signal block. Therefore, multiple radio frequency beams cannot be transmitted in the same synchronization signal block because if multiple beams from a physical cell are transmitted in the same synchronization signal block, the secondary synchronization signals of multiple beams would need to be transmitted on the same time domain symbol. However, different radio frequency beams are assumed to be transmitted at different times. Alternatively, if multiple radio frequency beams are transmitted on the same time domain symbol, the physical cell would need to have the ability to generate multiple radio frequency beams simultaneously. Even if the physical cell has the ability to transmit multiple radio frequency beams simultaneously, it is preferable that these multiple radio frequency beams transmit only one synchronization signal opportunity among the multiple primary synchronization signal transmission opportunities in a synchronization signal block. Figure 7As shown, the synchronization signal in synchronization signal block 1 is transmitted using beam 1i, i = 1, 2, 3, 4, respectively transmitted by APi (e.g., AP1 transmits beam 11, AP2 transmits beam 12, AP3 transmits beam 13, and AP4 transmits beam 14). The synchronization signal in synchronization signal block 2 is transmitted using beam 2i, i = 1, 2, 3, 4, respectively transmitted by APi (e.g., AP1 transmits beam 21, AP2 transmits beam 22, AP3 transmits beam 23, and AP4 transmits beam 24). Specifically, for example, in synchronization signal block j (such as synchronization signal block 1 or synchronization signal block 2), the synchronization signals of beams j1 and j2 occupy the transmission opportunities of the auxiliary synchronization signal and the first main synchronization signal (such as PSS1) in the main synchronization signal block j. Beams j1 and j2 correspond to two synchronization signals, which are code-division multiplexed. For example, if two synchronization signals correspond to two main synchronization signals and one auxiliary synchronization signal, then the two main synchronization signals are code-division multiplexed on one main synchronization signal transmission opportunity; or if two synchronization signals correspond to two main synchronization signals and two auxiliary synchronization signals, then the two main synchronization signals are code-division multiplexed on one main synchronization signal transmission opportunity, and the two auxiliary synchronization signals are code-division multiplexed on one auxiliary synchronization signal transmission opportunity; or if two synchronization signals correspond to one main synchronization signal and two auxiliary synchronization signals, then the two auxiliary synchronization signals are code-division multiplexed on one auxiliary synchronization signal transmission opportunity. The synchronization signals of beams j3 and j4 occupy the transmission opportunities of the second main synchronization signal (such as PSS2) and one auxiliary synchronization signal in the main synchronization signal block j, j = 1, 2. Each of the multiple master synchronization signal transmission opportunities in a synchronization signal block includes one or more code master synchronization signal sequences.

[0139] Each physical cell corresponds to one transmitting node. Multiple transmitting nodes can form a cell group, which can also be called a physical cell or a virtual cell. Here, a physical cell represents the root primary synchronization signal sequence, the primary synchronization signal transmission opportunity index, and the secondary synchronization signal sequence index (also called the synchronization signal index, the code domain index of the synchronization signal, or the combined index, where one combination corresponds to a code domain index of a synchronization signal and a primary synchronization signal transmission opportunity index) within a synchronization signal block. One physical cell index corresponds to one or more synchronization signal blocks. When multiple synchronization signal blocks are involved, the same synchronization signal index corresponding to the same synchronization signal can be transmitted in each of the multiple synchronization signal blocks. The patterns and sequences of the synchronization signals in the multiple synchronization signal blocks are identical, and the synchronization signal corresponding to this physical cell occupies the primary synchronization signal transmission opportunity in the multiple synchronization signal blocks. The sequence indices of the primary synchronization signals are the same. In a specified frequency bandwidth, the total number of candidate synchronization signals is the number of physical cell indices multiplied by the number of synchronization signal blocks. Different synchronization signals do not satisfy a quasi-co-address relationship. The physical cell index in this paper is only used to distinguish synchronization signals and does not restrict the correspondence between physical cells and communication parameters. The communication parameters include at least one of the following: data parameters, control parameters, and measurement parameters. For example, in the future, each physical cell may correspond to a set of communication parameters, or a group of physical cells may correspond to a set of communication parameters. More precisely, the physical cell index can be called the first index of the synchronization signal, and the synchronization signal block can be called the second index of the synchronization signal. Figure 6 A synchronization signal block may include one auxiliary synchronization signal time domain symbol and two main synchronization signal time domain symbols. It is also possible that a synchronization signal block may include one auxiliary synchronization signal time domain symbol and more than two main synchronization signal time domain symbols. Figure 6 In a synchronization signal block, the time-domain symbols of multiple primary synchronization signals are located on one side of the time-domain symbol of a secondary synchronization signal. This embodiment also does not exclude the possibility that the time-domain symbols of multiple primary synchronization signals are located on either side of the time-domain symbol of a secondary synchronization signal, such as... Figure 8 As shown, in synchronization signal block 1 and synchronization signal block 2, the time domain symbols of PSS1 and PSS2 are located on either side of the time domain symbol of SSS1. Furthermore... Figure 8 compared to Figure 6 It can reduce time-domain interference between multiple primary synchronization signals, and the detection of secondary synchronization signals is more accurate after the primary synchronization signal is retrieved because the channel characteristics change less at this point. (Comparison) Figure 5 , Figures 6-8 This can lead to significant interference on the auxiliary synchronization signal, for example... Figure 5 In this context, the number of physical cells that are code-division multiplexed on the same secondary synchronization time-domain symbol equals the number of secondary synchronization signal sequences multiplied by the number of primary synchronization signal sequences. Figures 6-8In this context, the number of physical cells that are code-division multiplexed on the same secondary synchronization time-domain symbol equals the number of secondary synchronization signal sequences multiplied by the number of primary synchronization signal sequences multiplied by the number of primary synchronization signal transmission opportunities. Alternatively, it can be considered... Figure 5 In this context, the number of cells that reuse the same secondary synchronization signal sequence on the time domain symbol of a secondary synchronization signal is the number of primary synchronization signal sequences, for example... Figure 5 The synchronization signal is multiplexed by three physical cells, meaning that if these three physical cells send a synchronization signal, they will all send the same secondary synchronization signal. The same secondary synchronization signal sequence is sent in the time domain symbols. Figures 6-8 In this context, the number of cells where an identical secondary synchronization signal sequence is multiplexed on a secondary synchronization signal time-domain symbol equals the number of primary synchronization signal sequences multiplied by the number of primary synchronization signal transmission opportunities. Figures 6-8 In this context, the signal is multiplexed by 3*2=6 physical cells. That is, in the time domain symbol of the secondary synchronization signal, the same secondary synchronization signal sequence is transmitted by 6 physical cells. Here, it is assumed that there are 3 primary synchronization signal sequences and 336 secondary synchronization signal sequences. The relative positional relationship between multiple primary synchronization signal transmission opportunities and one secondary synchronization signal in each synchronization signal block is predetermined. Preferably, in different synchronization signal blocks within a frequency domain bandwidth, the relative positional relationship between multiple primary synchronization signal transmission opportunities and one secondary synchronization signal is the same. For example... Figures 6-8 As shown, in the two synchronization signal blocks, the relative relationships between the transmission opportunities of the two primary synchronization signals and the transmission opportunity of the secondary synchronization signal are the same. Thus, after the terminal detects the primary synchronization signal in any synchronization signal block, it can obtain the transmission opportunity of the secondary synchronization signal without blindly detecting the index of the synchronization signal block. This convention includes agreements made by both the transmitting and receiving ends, and / or determination of their relative positions based on the frequency domain bandwidth of the synchronization signals. Figures 6-8 Each synchronization signal block in the code can also be referred to as two synchronization signal blocks. Figures 4-6 Each diagram in the diagram includes four synchronization signal blocks. Each synchronization signal block includes one primary synchronization signal transmission opportunity and one secondary synchronization signal transmission opportunity. Thus, the secondary synchronization signal transmission opportunities for two synchronization signal blocks are the same. For example... Figure 8 Synchronization signal block 1 is split into two synchronization signal blocks, 11 and 12. The auxiliary synchronization signal transmission opportunity and the main synchronization signal transmission opportunity on the left constitute synchronization signal block 11, and the auxiliary synchronization signal transmission opportunity and the main synchronization signal transmission opportunity on the right are called synchronization signal block 12. In this way, synchronization signal block 11 and synchronization signal block 12 share the auxiliary synchronization signal transmission opportunity.

[0140] Compared to schemes 5 and 6, scheme 7 has a lower search complexity for the primary synchronization signal. The complexity of the terminal blindly detecting the primary synchronization signal within the time-domain search window is the same as the search complexity of the primary synchronization signal in schemes 1 and 2, considering the number of primary synchronization signal sequences and time points. Furthermore, scheme 7 significantly increases the number of physical cells, or the number of first synchronization signal indices, and reduces the bandwidth occupied by the primary synchronization signal. For example, when generating the same number of synchronization signal indices, scheme 7 requires less bandwidth for primary synchronization compared to schemes 1 to 6. Schemes 5 to 7 are suitable not only for synchronization signal transmission in distributed scenarios but also for scenarios with a large requirement for the number of cell indices in non-distributed communication.

[0141] The main features of schemes 1 through 7 are summarized below:

[0142] Table 1. Characteristics of different transmission schemes for synchronization signals

[0143]

[0144]

[0145]

[0146] Therefore, one of the above seven schemes can be selected as the synchronization signal transmission scheme according to requirements. For example, the terminal can determine which of the above schemes is the synchronization signal transmission scheme based on one or more of the resources where the synchronization signal is located. Different resource subsets correspond to different transmission methods, and the resources include at least one of the following: time domain resources, frequency domain resources, and code domain resources. Alternatively, the base station can notify the synchronization signal transmission scheme through the PBCH. Considering the stability of synchronization signal measurement, one of schemes 2 to 7 is preferred. Considering the load of the synchronization signal, scheme 1 can be adopted. Schemes 1 to 6 above assume that a synchronization signal block includes one primary synchronization signal transmission opportunity and one secondary synchronization signal transmission opportunity. Compared with scheme 6, the frequency domain bandwidth occupied by the primary synchronization signal in scheme 7 can also be lower.

[0147] Figure 2 and Figure 9 In the middle, AP1 to AP3 each use a beam to transmit synchronization signals (these synchronization signals can be the same synchronization signal, such as...). Figure 9 And as shown in Scheme 1, or different synchronization signals (different synchronization signals can be located in one synchronization signal block, or multiple synchronization signal blocks), Figure 2 and Figure 9 In this context, each AP's beam can be either a directional beam or an omnidirectional beam.

[0148] If the synchronization signal adopts Scheme 1, it is preferably suitable when the three APs are co-located and / or geographically not far apart, thus the aforementioned spatial deep attenuation problem is not severe. If this is to be used when the APs are not co-located, a quasi-co-location area for the synchronization signal can be defined. A synchronization signal satisfies the quasi-co-location relationship within one quasi-co-location area; it does not satisfy the quasi-co-location relationship in different quasi-co-location areas. One quasi-co-location area includes one or more transmission opportunities for this synchronization signal (the transmission opportunities here are different from the transmission opportunities of the primary and secondary synchronization signals mentioned above; here, the transmission opportunities of one synchronization signal include one transmission opportunity for the primary synchronization signal and one transmission opportunity for the secondary synchronization signal, for example,...). Figures 6-8 (A synchronization signal in a synchronization block), where multiple transmission machines have the same or similar frequency domain location corresponding to a synchronization signal, but the multiple transmission machines differ primarily in the time domain; this can also be called a time-domain quasi-co-located region. And / or, where multiple transmission machines have the same or similar time domain location corresponding to a synchronization signal, but the multiple transmission machines correspond to multiple different frequency domain resources; this can also be called a frequency-domain quasi-co-located region. Combining the above... Figure 4 (a) in the example Figure 9 As shown, Figure 9 Figure (a) shows three APs transmitting the same synchronization signal SS1 (i.e., AP1 transmits SS1 with beam 1, AP2 transmits SS1 with beam 2, and AP3 transmits SS1 with beam 3), and a quasi-co-located area includes one or more transmission opportunities for SS1. Figure 9 In (b) of this embodiment, a quasi-co-located region includes one or more time-domain transmission opportunities for a synchronization signal. However, this embodiment does not exclude the possibility that when a synchronization signal has multiple transmission opportunities in the frequency domain, a frequency-domain quasi-co-located region also needs to be defined. A synchronization signal satisfies the quasi-co-located relationship within one frequency-domain quasi-co-located region, but not in different frequency-domain quasi-co-located regions. The quasi-co-located region is introduced because when transmitting the signal using the above formula, there will be spatial attenuation. As the receiver's position moves, the reception performance of this synchronization signal differs. Therefore, a quasi-co-located region is introduced in the time domain. Furthermore, the multipath spread of this synchronization signal is relatively large, so a quasi-co-located region can be introduced in the frequency domain. At this time, the synchronization signal in different quasi-co-located regions can also be called different synchronization signals, only their synchronization signal indices are the same. This synchronization signal index is only used to reflect at least one of the following: synchronization signal block index, synchronization signal sequence index, and the index of the synchronization signal among multiple candidate synchronization signals corresponding to a synchronization signal block.

[0149] At this time, the common channel can adopt one or more of the following schemes A to I, wherein the common channel includes at least one of the following: a broadcast channel (e.g., PBCH); a common control channel for notifying system messages (e.g., coordinated reset 0, and / or a physical downlink shared channel (PDSCH) that schedules system information blocks (SIBs)); or a PDSCH that includes SIBs. In schemes A to G, the transmission design principle of these common channels is that the common channels corresponding to multiple synchronization signals of multiple APs are related, rather than independent. Multiple APs send the same information bit sequence before channel coding {c(0),c(1),...c(E-1)}, or multiple APs jointly send the same information bit sequence before channel coding {c(0),c(1),...c(E-1)}. Where E is a positive integer, representing the number of bits included in the information sequence, and c(i), i = 0, 1,...E-1 are bits 0 and 1.

[0150] The purpose of this design is, on the one hand, to reduce the overhead of the common channel, it is not necessary to send AP-level common information, but only AP group-level common information transmitted in the common channel. The terminal only needs to know the common information of its AP group. For example, the common information is shared and the same for multiple APs in the AP group.

[0151] On the other hand, to reduce the number of cell handovers for the terminal and the complexity of detecting common channels, the terminal maintains only one set of common information for an AP group. This common information may include the common information of each AP in the AP group. When the terminal receives this common information under the coverage of any AP in the AP group, and moves from the first coverage area of ​​the first AP to the second coverage area of ​​the second AP, the terminal does not need to reacquire the common information. For example, {c(0), c(1), ... c(E-1)} includes multiple bit subsets, each bit subset corresponding to a different AP in the AP group. These different APs can be distinguished by at least one of the following: the sequence index of the synchronization signal, the time-domain resources occupied by the synchronization signal, or the frequency-domain resources occupied by the synchronization signal. Of course, this embodiment also excludes the case where the common channels corresponding to multiple APs are independent.

[0152] Furthermore, it fully considers the load, interference, spatial attenuation, and terminal detection complexity of public channels in densely populated or distributed scenarios.

[0153] The following describes Schemes A-I, which can be used for the common channel, with specific examples.

[0154] Option A: A common channel includes P demodulation reference signal (DMRS) ports. Figure 2 In this context, P=3), this common channel corresponds to a redundant version of a codeword. The modulation symbols of this common channel are first mapped to the demodulation reference signal ports, and then mapped to time-frequency resources, thus achieving spatial diversity gain for the three demodulation reference signal ports. For example, if the set of modulation symbols for this common channel is {x(0), x(1), ..., x(N*P-1)}, then the set of modulation symbols on each of the P demodulation reference signal ports is as follows:

[0155]

[0156] Preferably, the terminal can effectively demodulate the modulation symbol set {x(0),x(1),...,x(N*P-1)} only when it receives P DMRS ports. For example... Figure 2 In this scenario, at the intersection of three APs, the reception performance of the common channel is not too bad. However, if a terminal can only receive the signal from one AP, it cannot effectively demodulate {x(0),x(1),...,x(N*P-1)}, and the channel decoding performance of the common channel may be poor. Therefore, this scheme is more suitable for situations where the target coverage areas of the signals transmitted by P APs highly overlap, where the target coverage area represents the geographical area where the receivers of these P synchronization signals are located. Moreover, since different demodulation reference signals correspond to different modulation symbols, the signal models corresponding to the P demodulated signals are as shown in Formula 2 above, which can avoid the problem of spatial deep attenuation.

[0157] Scheme B: Three common channels correspond to three demodulation reference signal ports, with each common channel corresponding to one of these three ports. The three common channels contain the same information, and their channel coding redundancy versions are identical, but the scrambling sequences before modulation differ. For example, the channel coding sequences for the three common channels might be: r is the channel coding rate.

[0158] Different demodulation reference signal ports correspond to different scrambling sequences. For example, the scrambling sequences corresponding to three demodulation reference signals are as follows: This results in 3 sequences.

[0159] This results in three different sets of modulation symbols. When these three common channels occupy the same time-frequency resources, the signal transmission model is as shown in Formula 2. In this case, s in Formula 2... i Let be the modulation symbol in the i-th common channel.

[0160] When the terminal receives one or more of the P demodulation reference signals, it can decode the bit sequence. Furthermore, when the P demodulation reference signals correspond to the P common channels on the same time-frequency resources, they conform to the signal model shown in Formula 2. This avoids the problem of spatial deep attenuation of the data signals in the common channels. Moreover, when the terminal receives multiple of the P demodulation reference signals, it can utilize the ports of these multiple demodulation reference signals. The corresponding soft information before channel decoding is soft-combined to improve decoding performance. This allows terminals in the cell center (e.g., receiving only one of P demodulation reference signals) and terminals at the cell edge (e.g., receiving multiple of P demodulation reference signals) to decode the common channel effectively. The former has a higher received power for a single demodulation reference signal, while the latter, due to the diversity gain from multiple demodulation reference signals, also has good received performance for the common channel. In this case, the bit sequences before scrambling after channel coding for the three common channels can be considered identical. When the three demodulation reference signals correspond to three synchronization signals transmitted by three APs, these three synchronization signals correspond to three physical cell indices. Three scrambling sequences are obtained based on these three physical cell indices. For example, the three physical cell indices can be used to obtain scrambling sequence initialization parameters, or the three demodulation reference signals can correspond to three combinations of (physical cell index, synchronization signal block index), and three scrambling sequences are obtained based on these three combinations.

[0161] Scheme C: Three common channels correspond to three demodulation reference signal ports. Each of the three common channels corresponds to one of these three demodulation reference signal ports. These three demodulation reference signal ports correspond to the three synchronization signals transmitted by the three APs mentioned above. The three common channels contain the same information, and the redundant versions of the channels corresponding to these three common channels are identical; in other words, these three common channels are repeated transmissions of the same information. Moreover, the scrambling sequence before modulation is also the same.

[0162] Specifically, these three common channels correspond to the same set of modulation symbols {x(0),x(1),...,x(N-1)}, then the set of modulation symbols on the P demodulation reference signal ports is:

[0163] y j(i) = x(i), i = 0, 1, ..., N-1, j = 0, 1, ... P-1. Formula 10.

[0164] Schemes D to F below are extensions of schemes A to C. They divide the P demodulation reference signals into Q demodulation reference signal groups, each corresponding to a redundant version. Each of the Q demodulation reference signal groups is called scheme D if it uses scheme A, scheme E if it uses scheme B, and scheme F if it uses scheme C. For the q-th demodulation reference signal group, when applying schemes A to C, P in schemes A to C is updated to P. q , q∈{1,...Q}.

[0165] For schemes E and C, the terminal can demodulate the information contained in the common channel by receiving any one of the P DMRS ports. However, some DMRS ports contain different redundancy versions of the modulation symbol set, so their performance may differ. For example, redundancy version 0 has the best channel decoding performance, followed by redundancy version 1. But if the terminal receives two demodulation reference signal ports, the channel decoding performance of both redundancy versions 0 is worse than that of redundancy versions 0 and 1 respectively. Therefore, assigning different redundancy versions to different DMRS groups can improve the channel coding gain. However, compared to schemes B and C, if the terminal can only receive one of the P DMRS ports and the corresponding redundancy version is not 0 (assuming redundancy version 0 is the redundancy version with the largest channel coding gain), its demodulation performance is worse than schemes B and C. To address this, ports in a DMRS port group can be assigned to APs with minimal overlap in the target reception area. Specifically, the redundant version with optimal reception performance can be assigned to APs that can essentially cover the entire area; for example, three APs can cover an area, meaning each user in that area will receive a signal from any one of those three APs. Conversely, DMRS ports in different DMRS port groups can be assigned to APs with significant overlap in the target reception area. This ensures that each terminal receives the best redundant version, and terminals in overlapping areas with multiple APs can also benefit from different performance gains from varying redundancy versions. The number of DMRS ports included in the DMRS port groups corresponding to different redundancy versions can vary.

[0166] Scheme G: A common channel includes a demodulation reference signal, a demodulation reference signal port, and P synchronization signals that satisfy a quasi-co-address relationship. For example, this demodulation reference signal is transmitted simultaneously by P APs, along with the demodulation reference signal and data signal corresponding to this demodulation reference port.

[0167] Scheme H: 3 APs send 3 independent common channels. The common information contained in each common channel is independent of each other, and each common channel corresponds to a synchronization signal.

[0168] This section summarizes the main characteristics of schemes A through G. Schemes A through G all involve multiple synchronization signals transmitting the same common information. However, the main differences between the schemes include at least one of the following: redundancy, number of demodulation reference signal ports, mapping method from modulation symbols to resources, total time-frequency resources occupied, acquisition of scrambling sequences, and signal model. In schemes A through G, the P demodulation reference signals corresponding to the common channel occupy the same set of time-frequency resources, i.e., spatial multiplexing. Of course, this embodiment does not exclude the possibility that the P demodulation reference signals corresponding to the common channel occupy different sets of time-frequency resources. For each set of time-frequency resources, one or more of schemes A through G can be used.

[0169] In the example above, P = 3, but this embodiment does not exclude the possibility that P may be other values.

[0170] In the above description, the redundant version refers to the bit rate matching scheme after channel coding and before modulation, thus obtaining the information bits before modulation. Different redundant versions correspond to different bit rate matching schemes. For example, if the information bits after channel coding form a ring, different redundant versions represent bits extracted from different positions on the ring. This is just an example, and this embodiment does not exclude other bit rate matching schemes.

[0171] In the above description, each synchronization signal corresponds to a combination of time-domain, frequency-domain, code-domain, and spatial-domain resources. Different synchronization signals correspond to at least one different time-domain, frequency-domain, code-domain, and spatial-domain resources. The spatial-domain resources correspond to a set of quasi-co-addressable parameters, and signals corresponding to the same spatial-domain resources satisfy a quasi-co-addressable relationship with respect to these parameters. The quasi-co-addressable parameters include at least one of the following: Doppler shift, Doppler spread, average delay, delay spread, and average gain. In the description of Scheme 1, it can also be considered that each synchronization signal corresponds to a combination of time-domain, frequency-domain, and code-domain resources, and one synchronization signal corresponds to more than one quasi-co-addressable region. Different quasi-co-addressable regions correspond to different spatial-domain resources.

[0172] For a given terminal, it's necessary to determine its corresponding P synchronization signals. Different terminals may have different P synchronization signals. The terminal selects N synchronization signals from these P signals to identify the N access points (APs) serving it. The P synchronization signals can be determined based on the resources they occupy, including at least one of the following: time-domain resources, frequency-domain resources, and code-domain resources. For example, if the terminal detects that synchronization signal 1 has good performance, it can determine that the P synchronization signals belong to a first synchronization signal set, which includes synchronization signal 1. The synchronization signal set to which a particular synchronization signal belongs is determined based on the resources it occupies. Alternatively, the first synchronization signal set can be determined based on its sequence index. Alternatively, the base station can notify each synchronization signal set of the included synchronization signals. A synchronization signal set includes synchronization signals from multiple APs located close to each other. By using the synchronization signal set selected by the terminal, the base station knows which area the terminal is located in. For example... Figure 2The synchronization signals sent by the three APs constitute a synchronization signal set. Terminal detection can then be based on this synchronization signal set; that is, the terminal's area must be within the coverage area of ​​the synchronization signal set. For example, if there are 64 synchronization signal sets (i.e., 64 second synchronization signal sets), the terminal first checks the synchronization signals in synchronization signal set 1. If no synchronization signal is detected in synchronization signal set 1, it can check synchronization signals in synchronization signal set 2, and so on. This ensures that synchronization signals sent by base stations in close proximity belong to the same synchronization signal set during future base station deployment. In existing schemes, for each synchronization signal block in a frequency band, there is only one synchronization signal set, including 336*3 synchronization signals (also referred to as corresponding to 336*3 physical cell indices). The terminal must blindly detect these 336*3 synchronization signals and select one. Introducing multiple synchronization signal sets here reduces the complexity of blind detection for the terminal. For example, the terminal can first select a synchronization signal set and then select N synchronization signals from that set. Specifically, the terminal first detects multiple synchronization signals, each belonging to a different synchronization signal set. One synchronization signal is extracted from each of these sets. If a synchronization signal is detected, one or more (i.e., N synchronization signals) are selected from the set containing that signal. Synchronization signals in each set are transmitted by base stations located close to each other. Alternatively, each synchronization signal set can be considered a supercell, including one or more base stations. The terminal can also pre-define the synchronization signals included in a set, but specify the characteristics that the synchronization signals in that set must meet. Upon detecting one or more synchronization signals, the terminal selects N synchronization signals from these signals. These N synchronization signals must satisfy the characteristics required for a synchronization signal set, including the characteristics satisfied by the aforementioned P synchronization signals. Since these one or more synchronization signals belong to P APs, the terminal selects one or more APs from the P APs. The terminal then sends the selected synchronization signal information to the base station. This reporting can occur during random access or after access is established. If the report is submitted during the random access phase, the base station can know the set of APs selected by the terminal as early as possible, and the base station can know the super cell index where the terminal is located during the initial access phase. In particular, the synchronization signal in a synchronization signal block is divided into multiple synchronization signal sets, which can also be referred to as multiple synchronization signal sets or multiple physical cell sets.

[0173] The above embodiment shows that the same synchronization signal block corresponds to multiple synchronization signal sets. In another embodiment, the synchronization signal in a synchronization signal window is divided into multiple synchronization signal sets. The candidate time-frequency code resources occupied by the synchronization signal in one synchronization signal window are agreed upon and limited by the terminal and the base station. For example, the synchronization signal window is composed of up to 64 synchronization blocks similar to those in NR.

[0174] In some embodiments, the Q synchronization signals are the same as the P synchronization signals mentioned above. That is, before the terminal selects N synchronization signals, the terminal needs to know the characteristics of the synchronization signals in the first synchronization signal set to which the selected N synchronization signals belong, or the information of the Q synchronization signals included in the first synchronization signal set. The Q synchronization signals are sent by multiple APs that are close to or overlap with the target coverage area. The Q synchronization signals can correspond to a super cell index, and a super cell includes one or more physical cells.

[0175] In other embodiments, the Q synchronization signals include not only the P synchronization signals but also other synchronization signals besides the P synchronization signals, such as a single first set of synchronization signals. The terminal selects a synchronization signal from this large set, and the physical cells corresponding to the synchronization signals in this set are not necessarily geographically close. However, to avoid interference between synchronization signals from neighboring cells and measurement instability, the synchronization signals transmitted by geographically close cells among the Q synchronization signals should satisfy the characteristics of the aforementioned P synchronization signals, or each of the Q synchronization signals needs to satisfy the characteristics in schemes 5 to 7. Schemes 1 to 4 describe the relationship between different synchronization signals, while schemes 5 to 7 focus more on satisfying the relationship between synchronization signals and describe the characteristics that a single synchronization signal should satisfy. In one embodiment, the N synchronization signals are the aforementioned P synchronization signals.

[0176] In some embodiments, Q synchronization signals are equivalent to N synchronization signals, and all or part of the N synchronization signals constitute the aforementioned P synchronization signals.

[0177] In summary, this disclosure presents different schemes for transmitting synchronization signals from multiple APs from three perspectives: synchronization signal load, terminal detection complexity, and spatial deep attenuation. In practical applications, the appropriate synchronization signal transmission scheme can be selected based on which of the above factors is more important or which factor is the core factor affecting synchronization signal detection performance. Furthermore, this disclosure divides the synchronization signal in a carrier frequency into multiple synchronization signal sets, reducing the complexity of terminal synchronization signal detection while allowing the base station to obtain the supercell index from the relevant information of the selected synchronization signal set. Moreover, this disclosure also considers the common channel load, terminal detection complexity, and spatial deep attenuation, providing transmission schemes for common channels in dense or distributed cell scenarios, effectively improving the reception performance of common channels.

[0178] This disclosure also provides a communication method applied to a second communication node, such as... Figure 10 As shown, the communication method may include:

[0179] S1001, Receive the first signal sent by the first communication node.

[0180] The first signal includes information about N synchronization signals. The N synchronization signals belong to the same first synchronization signal set, which includes Q synchronization signals. N is a positive integer greater than or equal to 1, and Q is a positive integer greater than or equal to N.

[0181] As one possible implementation, the first signal can satisfy at least one of the following:

[0182] The first signal includes the signal during the random access phase;

[0183] The first signal includes the index information of each of the N synchronization signals;

[0184] There is a pre-defined correspondence between the index information of the first signal and the N synchronization signals.

[0185] It should be noted that the description of the N synchronization signals can be found in the above embodiments, and will not be repeated here.

[0186] The following describes the communication method provided in the above embodiment using the interaction between the first communication node and the second communication node as an example. Figure 11 As shown, it includes:

[0187] S1101, The first communication node determines N synchronization signals.

[0188] S1102, The first communication node sends a first signal to the second communication node.

[0189] S1103, The second communication node receives the first signal sent by the first communication node.

[0190] It should be noted that, before or when determining the N synchronization signals, the first communication node detects synchronization signals sent by one or more third communication nodes, and determines or selects the N synchronization signals from the detected synchronization signals. One or more third communication nodes may include the second communication node, or may be a different communication node than the second communication node.

[0191] It is understood that, in order to achieve the above-mentioned functions, the communication device includes hardware structures and / or software modules corresponding to the execution of each function. Those skilled in the art should readily recognize that, based on the algorithmic steps of the examples described in conjunction with the embodiments of this disclosure, this disclosure can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0192] This disclosure embodiment can divide the communication device into functional modules according to the above method embodiment. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one functional module. The integrated module can be implemented in hardware or software. It should be noted that the module division in this disclosure embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. The following description uses the example of dividing each functional module according to each function.

[0193] Figure 12 This is a schematic diagram of the structure of a communication device provided in an embodiment of this disclosure. Figure 1 The communication device can be applied to the first communication node and perform the above-mentioned functions. Figure 3 The communication method shown, and Figure 11 An example from the first communication node side. For example... Figure 12 As shown, the communication device 1200 includes a processing module 1201 and a transmitting module 1202.

[0194] The processing module 1201 is used to determine N synchronization signals, which belong to the same first synchronization signal set. The first synchronization signal set includes Q synchronization signals, where N is a positive integer greater than or equal to 1 and Q is a positive integer greater than or equal to N. The sending module 1202 is used to send a first signal to the second communication node, which includes relevant information about the N synchronization signals.

[0195] In some embodiments, the Q synchronization signals include at least one first synchronization signal, wherein each first synchronization signal corresponds to multiple quasi-co-located regions, and a quasi-co-located region includes one or more transmission opportunities of the first synchronization signal; wherein, in the case of multiple transmission opportunities, the multiple transmitters are located differently in the time domain and / or frequency domain, and the first synchronization signals on the multiple transmission opportunities satisfy a quasi-co-located relationship.

[0196] In some embodiments, Q synchronization signals occupy more than one synchronization signal block.

[0197] In some embodiments, the synchronization signal sequences corresponding to the Q synchronization signals are the same, and / or the main synchronization signal sequences corresponding to the Q synchronization signals are the same.

[0198] In some embodiments, the Q synchronization signals belong to the same synchronization signal block.

[0199] In some embodiments, at least two of the Q synchronization signals have different primary synchronization signals.

[0200] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and the number of sequences in the candidate sequence set of the primary synchronization signal is greater than 3.

[0201] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and satisfies at least one of the following characteristics:

[0202] The transmission bandwidth occupied by a master synchronization signal is greater than the preset value;

[0203] A primary synchronization signal occupies a discontinuous subcarrier;

[0204] The number of subcarriers occupied by a master synchronization signal is determined by Q;

[0205] The subcarrier spacing of a master synchronization signal is determined based on Q;

[0206] The number of sequences included in the candidate master synchronization signal sequence set is determined based on Q.

[0207] In some embodiments, the transmission bandwidth occupied by a primary synchronization signal being greater than a preset value includes: the number of subcarriers occupied by a primary synchronization signal being greater than a preset value, wherein the preset value is 127.

[0208] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal in a synchronization signal block, wherein the synchronization signal block includes multiple transmission opportunities for the primary synchronization signals, wherein a transmission opportunity for one primary synchronization signal is a resource set occupied by the primary synchronization signal, and the transmission opportunities for the multiple primary synchronization signals occupy multiple resource sets respectively, wherein the resources include at least one of the following: time-domain resources, frequency-domain resources, and the Q synchronization signals are located in one or more synchronization signal blocks.

[0209] In some embodiments, in a synchronization signal block, the number of transmission opportunities for the primary synchronization signal is greater than the number of transmission opportunities for the secondary synchronization signal.

[0210] In some embodiments, the synchronization signal block satisfies at least one of the following:

[0211] A synchronization signal block includes at least two transmission opportunities for the primary synchronization signal and only one transmission opportunity for the secondary synchronization signal.

[0212] The transmission opportunities of multiple master synchronization signals in a synchronization signal block are occupied by different synchronization signals respectively;

[0213] In a synchronization signal block, multiple master synchronization signals each occupy different transmission opportunities among the multiple master synchronization signal transmission opportunities;

[0214] Multiple master synchronization signals in a synchronization signal block occupy different master synchronization signal sequences in the transmission opportunity of a master synchronization signal;

[0215] The number of candidate synchronization signals corresponding to a synchronization signal block is determined based on the number of primary synchronization signal sequences, the number of secondary synchronization signal sequences, and the number of transmission opportunities for multiple primary synchronization signals;

[0216] A synchronization signal block corresponds to a candidate synchronization signal set, and a candidate synchronization signal set includes at least one second synchronization signal set, wherein the first synchronization signal set is one of the at least one second synchronization signal set.

[0217] In some embodiments, the Q synchronization signals include at least two synchronization signals, and the at least two synchronization signals each occupy the transmission opportunity of a different master synchronization signal in a synchronization signal block.

[0218] In some embodiments, the first index of a synchronization signal in a synchronization signal block is determined based on the index of the primary synchronization signal sequence, the index of the secondary synchronization signal sequence, and the index of the transmission opportunity of the primary synchronization signal.

[0219] In some embodiments, the first index is a physical cell index; and / or the first index is an index of a synchronization signal among multiple synchronization signals corresponding to a synchronization signal block.

[0220] In some embodiments, a second index of a synchronization signal is determined based on a first index and an index of a synchronization signal block corresponding to the synchronization signal, or a synchronization signal is determined based on a first index and an index of a synchronization signal block corresponding to the synchronization signal.

[0221] In some embodiments, the transmission opportunities of multiple master synchronization signals corresponding to the same first index in multiple different synchronization signal blocks are the same, wherein the index of the transmission opportunity of the master synchronization signal is the index of the transmission opportunity of the master synchronization signal in the multiple transmission opportunities included in a synchronization signal block.

[0222] In some embodiments, the transmission opportunities of multiple primary synchronization signals in a synchronization signal block are all located on one side of the transmission opportunity of the secondary synchronization signal in the time domain; or, in a synchronization signal block, some of the transmission opportunities of the primary synchronization signals are located on one side of the transmission opportunity of the secondary synchronization signal in the time domain, and other parts of the transmission opportunities of the primary synchronization signals are located on the other side of the transmission opportunity of the secondary synchronization signal in the time domain.

[0223] In some embodiments, the synchronization signal block satisfies at least one of the following:

[0224] The relative positions of the transmission opportunities of multiple primary synchronization signals and secondary synchronization signals in a synchronization signal block are predetermined; or,

[0225] In multiple synchronization signal blocks, the relative positions of the transmission opportunities of the multiple primary synchronization signals and the transmission opportunities of the secondary synchronization signals are the same.

[0226] In some embodiments, the communication device 1200 may further include: a receiving module 1203, comprising at least one of the following:

[0227] The receiving module 1203 is used to receive first indication information from the second communication node. The first indication information is used to indicate the characteristics satisfied by Q synchronization signals, so that the first communication node determines the first synchronization signal set according to the first indication information.

[0228] The receiving module 1203 is used to receive second indication information from the second communication node, the second indication information including information of the synchronization signals included in the first synchronization signal set;

[0229] The processing module 1201 is further configured to determine a first set of synchronization signals based on the transmission resources where the N synchronization signals are located, wherein the transmission resources include at least one of the following: time domain resources, frequency domain resources, and code domain resources.

[0230] In some embodiments, the different synchronization signals among the Q synchronization signals satisfy at least one of the following:

[0231] The main synchronization signal sequences are different between different synchronization signals;

[0232] The auxiliary synchronization signal sequences are different between different synchronization signals;

[0233] The transmission opportunities of the primary synchronization signal differ between different synchronization signals.

[0234] In some embodiments, the processing module 1201 is further configured to determine a plurality of second synchronization signal sets, the plurality of second synchronization signal sets including a first synchronization signal set.

[0235] In some embodiments, the plurality of second synchronization signal sets satisfy at least one of the following:

[0236] The synchronization signals in multiple sets of second synchronization signals reside on a single carrier wave;

[0237] The synchronization signals in multiple sets of second synchronization signals are located in a synchronization signal frequency domain search grid;

[0238] The set of multiple second synchronization signals is determined based on the transmission resources where the N synchronization signals are located;

[0239] The first synchronization signal set among multiple second synchronization signal sets is selected by the first communication node.

[0240] In some embodiments, the Q synchronization signals are located on a single carrier wave; or...

[0241] Q synchronization signals are located in a synchronization signal frequency domain search grid.

[0242] In some embodiments, the first signal satisfies at least one of the following:

[0243] The first signal includes the signal during the random access phase;

[0244] The first signal includes the index information of each of the N synchronization signals;

[0245] There is a pre-defined correspondence between the index information of the first signal and the N synchronization signals.

[0246] In some embodiments, at least one of the following conditions is met:

[0247] N synchronization signals correspond to A common channel demodulation reference signals, where A is a positive integer less than or equal to N;

[0248] Q synchronization signals correspond to P common channel demodulation reference signals, where P is a positive integer less than or equal to Q.

[0249] In some embodiments, at least one of the following conditions is met:

[0250] A common channel demodulation reference signals belong to P common channel demodulation reference signals;

[0251] The common channel data corresponding to the P common channel demodulation reference signals include the same common information;

[0252] Each of the Q synchronization signals corresponds to one of the P common channel demodulation reference signals, and each of the P common channel demodulation reference signals corresponds to one or more synchronization signals in the Q synchronization signals.

[0253] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and an auxiliary synchronization signal in a synchronization signal block, wherein one synchronization signal block and another synchronization signal block correspond to the same auxiliary synchronization signal transmission opportunity, and the transmission opportunity of the auxiliary synchronization signal is a set of resources occupied by the auxiliary synchronization signal, wherein the resources include at least one of the following: time domain resources, frequency domain resources, and the Q synchronization signals are located in one or more synchronization signal blocks.

[0254] Figure 13 This is a schematic diagram of the structure of a communication device provided in an embodiment of this disclosure. Figure 2 The communication device can be applied to the second communication node and perform the above-mentioned functions. Figure 10 The communication method shown, and Figure 11 An example of an implementation on the second communication node side. For example... Figure 13 As shown, the communication device 1300 includes: a receiving module 1301.

[0255] The receiving module 1301 is used to receive a first signal sent by the first communication node; wherein the first signal includes relevant information about N synchronization signals, the N synchronization signals belong to the same first synchronization signal set, the first synchronization signal set includes Q synchronization signals, N is a positive integer greater than or equal to 1, and Q is a positive integer greater than or equal to N.

[0256] In some embodiments, the Q synchronization signals include at least one first synchronization signal, wherein each first synchronization signal corresponds to multiple quasi-co-located regions, and a quasi-co-located region includes one or more transmission opportunities of the first synchronization signal; wherein, in the case of multiple transmission opportunities, the multiple transmitters are located differently in the time domain and / or frequency domain, and the first synchronization signals on the multiple transmission opportunities satisfy a quasi-co-located relationship.

[0257] In some embodiments, Q synchronization signals occupy more than one synchronization signal block.

[0258] In some embodiments, the synchronization signal sequences corresponding to the Q synchronization signals are the same, and / or the main synchronization signal sequences corresponding to the Q synchronization signals are the same.

[0259] In some embodiments, the Q synchronization signals belong to the same synchronization signal block.

[0260] In some embodiments, at least two of the Q synchronization signals have different primary synchronization signals.

[0261] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and the number of sequences in the candidate sequence set of the primary synchronization signal is greater than 3.

[0262] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and satisfies at least one of the following characteristics:

[0263] The transmission bandwidth occupied by a master synchronization signal is greater than the preset value;

[0264] A primary synchronization signal occupies a discontinuous subcarrier;

[0265] The number of subcarriers occupied by a master synchronization signal is determined by Q;

[0266] The subcarrier spacing of a master synchronization signal is determined based on Q;

[0267] The number of sequences included in the candidate master synchronization signal sequence set is determined based on Q.

[0268] In some embodiments, the transmission bandwidth occupied by a master synchronization signal being greater than a preset value includes:

[0269] The number of subcarriers occupied by a primary synchronization signal is greater than a preset value, where the preset value is 127.

[0270] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal in a synchronization signal block, wherein the synchronization signal block includes multiple transmission opportunities for the primary synchronization signals, wherein a transmission opportunity for one primary synchronization signal is a resource set occupied by the primary synchronization signal, and the transmission opportunities for the multiple primary synchronization signals occupy multiple resource sets respectively, wherein the resources include at least one of the following: time-domain resources, frequency-domain resources, and the Q synchronization signals are located in one or more synchronization signal blocks.

[0271] In some embodiments, in a synchronization signal block, the number of transmission opportunities for the primary synchronization signal is greater than the number of transmission opportunities for the secondary synchronization signal.

[0272] In some embodiments, the synchronization signal block satisfies at least one of the following:

[0273] A synchronization signal block includes at least two transmission opportunities for the primary synchronization signal and only one transmission opportunity for the secondary synchronization signal.

[0274] The transmission opportunities of multiple master synchronization signals in a synchronization signal block are occupied by different synchronization signals respectively;

[0275] In a synchronization signal block, multiple master synchronization signals each occupy different transmission opportunities among the multiple master synchronization signal transmission opportunities;

[0276] Multiple master synchronization signals in a synchronization signal block occupy different master synchronization signal sequences in the transmission opportunity of a master synchronization signal;

[0277] The number of candidate synchronization signals corresponding to a synchronization signal block is determined based on the number of primary synchronization signal sequences, the number of secondary synchronization signal sequences, and the number of transmission opportunities for multiple primary synchronization signals;

[0278] A synchronization signal block corresponds to a candidate synchronization signal set, and a candidate synchronization signal set includes at least one second synchronization signal set, wherein the first synchronization signal set is one of the at least one second synchronization signal set.

[0279] In some embodiments, the Q synchronization signals include at least two synchronization signals, and the at least two synchronization signals each occupy the transmission opportunity of a different master synchronization signal in a synchronization signal block.

[0280] In some embodiments, the first index of a synchronization signal in a synchronization signal block is determined based on the index of the primary synchronization signal sequence, the index of the secondary synchronization signal sequence, and the index of the transmission opportunity of the primary synchronization signal.

[0281] In some embodiments, the first index is a physical cell index; and / or the first index is an index of a synchronization signal among multiple synchronization signals corresponding to a synchronization signal block.

[0282] In some embodiments, a second index of a synchronization signal is determined based on a first index and an index of a synchronization signal block corresponding to the synchronization signal, or a synchronization signal is determined based on a first index and an index of a synchronization signal block corresponding to the synchronization signal.

[0283] In some embodiments, the transmission opportunities of multiple master synchronization signals corresponding to the same first index in multiple different synchronization signal blocks are the same, wherein the index of the transmission opportunity of the master synchronization signal is the index of the transmission opportunity of the master synchronization signal in the multiple transmission opportunities included in a synchronization signal block.

[0284] In some embodiments, the transmission opportunities of multiple primary synchronization signals in a synchronization signal block are all located on one side of the transmission opportunity of the secondary synchronization signal in the time domain; or, in a synchronization signal block, some of the transmission opportunities of the primary synchronization signals are located on one side of the transmission opportunity of the secondary synchronization signal in the time domain, and other parts of the transmission opportunities of the primary synchronization signals are located on the other side of the transmission opportunity of the secondary synchronization signal in the time domain.

[0285] In some embodiments, the synchronization signal block satisfies at least one of the following:

[0286] The relative positions of the transmission opportunities of multiple primary synchronization signals and secondary synchronization signals in a synchronization signal block are predetermined; or,

[0287] In multiple synchronization signal blocks, the relative positions of the transmission opportunities of the multiple primary synchronization signals and the transmission opportunities of the secondary synchronization signals are the same.

[0288] In some embodiments, the communication device 1300 may further include a transmitting module 1302, comprising at least one of the following:

[0289] The sending module 1302 is used to send first indication information to the first communication node. The first indication information is used to indicate the characteristics satisfied by Q synchronization signals, so that the first communication node determines the first synchronization signal set according to the first indication information.

[0290] The sending module 1302 is used to send second indication information to the first communication node, the second indication information including information of the synchronization signals included in the first synchronization signal set.

[0291] In some embodiments, the different synchronization signals among the Q synchronization signals satisfy at least one of the following:

[0292] The main synchronization signal sequences are different between different synchronization signals;

[0293] The auxiliary synchronization signal sequences are different between different synchronization signals;

[0294] The transmission opportunities of the primary synchronization signal differ between different synchronization signals.

[0295] In some embodiments, the first synchronization signal set is one of a plurality of second synchronization signal sets.

[0296] In some embodiments, the plurality of second synchronization signal sets satisfy at least one of the following:

[0297] The synchronization signals in multiple sets of second synchronization signals reside on a single carrier wave;

[0298] The synchronization signals in multiple sets of second synchronization signals are located in a synchronization signal frequency domain search grid;

[0299] The set of multiple second synchronization signals is determined based on the transmission resources where the N synchronization signals are located;

[0300] The first synchronization signal set among multiple second synchronization signal sets is selected by the first communication node.

[0301] In some embodiments, the Q synchronization signals are located in one carrier wave; or, the Q synchronization signals are located in a synchronization signal frequency domain search grid.

[0302] In some embodiments, the first signal satisfies at least one of the following:

[0303] The first signal includes the signal during the random access phase;

[0304] The first signal includes the index information of each of the N synchronization signals;

[0305] There is a pre-defined correspondence between the index information of the first signal and the N synchronization signals.

[0306] In some embodiments, at least one of the following conditions is met:

[0307] N synchronization signals correspond to A common channel demodulation reference signals, where A is a positive integer less than or equal to N;

[0308] Q synchronization signals correspond to P common channel demodulation reference signals, where P is a positive integer less than or equal to Q.

[0309] In some embodiments, at least one of the following conditions is met:

[0310] A common channel demodulation reference signals belong to P common channel demodulation reference signals;

[0311] The common channel data corresponding to the P common channel demodulation reference signals include the same common information;

[0312] Each of the Q synchronization signals corresponds to one of the P common channel demodulation reference signals, and each of the P common channel demodulation reference signals corresponds to one or more synchronization signals in the Q synchronization signals.

[0313] In some embodiments, each of the Q synchronization signals includes a primary synchronization signal and an auxiliary synchronization signal in a synchronization signal block, wherein one synchronization signal block and another synchronization signal block correspond to the same auxiliary synchronization signal transmission opportunity, and the transmission opportunity of the auxiliary synchronization signal is a set of resources occupied by the auxiliary synchronization signal, wherein the resources include at least one of the following: time domain resources, frequency domain resources, and the Q synchronization signals are located in one or more synchronization signal blocks.

[0314] In implementing the functions of the integrated modules described above using hardware, this disclosure provides another possible structural illustration of the communication device involved in the above embodiments. Figure 3 .like Figure 14 As shown, the communication device 1400 includes a processor 1402 and a bus 1404. Optionally, the communication device 1400 may also include a memory 1401; alternatively, the communication device may also include a communication interface 1403.

[0315] Processor 1402 may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with embodiments of this disclosure. Processor 1402 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with embodiments of this disclosure. Processor 1402 may also be a combination of functions implementing computational capabilities, such as a combination of one or more microprocessors, a combination of a DSP and a microprocessor, etc.

[0316] Communication interface 1403 is used to connect to other devices via a communication network. This communication network can be Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0317] The memory 1401 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0318] As one possible implementation, the memory 1401 can exist independently of the processor 1402. The memory 1401 can be connected to the processor 1402 via a bus 1404 and is used to store instructions or program code. When the processor 1402 calls and executes the instructions or program code stored in the memory 1401, it can implement the communication method provided in the embodiments of this disclosure.

[0319] In another possible implementation, the memory 1401 can also be integrated with the processor 1402.

[0320] The 1404 bus can be an extended industry standard architecture (EISA) bus, etc. The 1404 bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 14 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0321] Some embodiments of this disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium) storing computer program instructions that, when executed on a computer, cause the computer to perform the communication method as described in any of the above embodiments.

[0322] Exemplary examples of computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROMs), cards, sticks, or key drives, etc.). The various computer-readable storage media described in this disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0323] This disclosure provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the communication method described in any of the above embodiments.

[0324] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions within the technical scope disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A communication method, characterized in that, Applied to a first communication node, the method includes: N synchronization signals are determined, and the N synchronization signals belong to the same first synchronization signal set. The first synchronization signal set includes Q synchronization signals, where N is a positive integer greater than or equal to 1, and Q is a positive integer greater than or equal to N. A first signal is sent to the second communication node, the first signal including relevant information about the N synchronization signals.

2. The method according to claim 1, characterized in that, The Q synchronization signals include at least one first synchronization signal, wherein each first synchronization signal corresponds to multiple quasi-co-located regions, and each quasi-co-located region includes one or more transmission opportunities of the first synchronization signal; wherein, when multiple transmission opportunities are included, the multiple transmitters are not located in the time domain and / or frequency domain, and the first synchronization signals on the multiple transmission opportunities satisfy a quasi-co-located relationship.

3. The method according to claim 1, characterized in that, The Q synchronization signals occupy more than one synchronization signal block or one synchronization signal block.

4. The method according to claim 3, characterized in that, When the Q synchronization signals occupy more than one synchronization signal block, the synchronization signal sequences corresponding to the Q synchronization signals are the same, and / or the main synchronization signal sequences corresponding to the Q synchronization signals are the same.

5. The method according to claim 1, characterized in that, Among the Q synchronization signals, at least two synchronization signals have different primary synchronization signals.

6. The method according to claim 1, characterized in that, Each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and the number of sequences in the candidate sequence set of the primary synchronization signal is greater than 3.

7. The method according to claim 1, characterized in that, Each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and satisfies at least one of the following characteristics: The transmission bandwidth occupied by the primary synchronization signal is greater than a preset value; The primary synchronization signal occupies discontinuous subcarriers; The number of subcarriers occupied by a primary synchronization signal is determined based on Q; The subcarrier spacing of the primary synchronization signal is determined based on Q; The number of sequences included in the candidate master synchronization signal sequence set is determined based on Q.

8. The method according to any one of claims 1 to 7, characterized in that, Each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal in a synchronization signal block. The synchronization signal block includes multiple transmission opportunities for the primary synchronization signals. One of the transmission opportunities for the primary synchronization signals is a resource set occupied by the primary synchronization signal. The multiple transmission opportunities for the primary synchronization signals occupy multiple resource sets respectively. The resources include at least one of the following: time-domain resources and frequency-domain resources. The Q synchronization signals are located in one or more synchronization signal blocks.

9. The method according to claim 8, characterized in that, In one of the synchronization signal blocks, the number of transmission opportunities for the primary synchronization signal is greater than the number of transmission opportunities for the secondary synchronization signal.

10. The method according to claim 9, characterized in that, The synchronization signal block satisfies at least one of the following: A synchronization signal block includes at least two transmission opportunities for the primary synchronization signal and only one transmission opportunity for the secondary synchronization signal. The transmission opportunities of the plurality of main synchronization signals in a synchronization signal block are respectively occupied by different synchronization signals; In one of the synchronization signal blocks, multiple main synchronization signals occupy different transmission opportunities among the multiple main synchronization signal transmission opportunities; Multiple master synchronization signals in one of the synchronization signal blocks occupy different master synchronization signal sequences in the transmission opportunity of one master synchronization signal; The number of candidate synchronization signals corresponding to one of the synchronization signal blocks is determined based on the number of primary synchronization signal sequences, the number of secondary synchronization signal sequences, and the number of transmission opportunities for the multiple primary synchronization signals; One of the synchronization signal blocks corresponds to one candidate synchronization signal set, and the candidate synchronization signal set includes at least one second synchronization signal set, wherein the first synchronization signal set is one of the at least one second synchronization signal sets.

11. The method according to claim 8, characterized in that, The Q synchronization signals include at least two synchronization signals, and the at least two synchronization signals each occupy a different transmission opportunity of the main synchronization signal in one of the synchronization signal blocks.

12. The method according to claim 8, characterized in that, The first index of a synchronization signal in the synchronization signal block is determined based on the index of the main synchronization signal sequence, the index of the auxiliary synchronization signal sequence, and the index of the transmission opportunity of the main synchronization signal.

13. The method according to claim 12, characterized in that, The first index is a physical cell index; and / or the first index is an index of the synchronization signal in a plurality of synchronization signals corresponding to a synchronization signal block.

14. The method according to claim 12, characterized in that, A second index of a synchronization signal is determined based on the first index and the index of the synchronization signal block corresponding to the synchronization signal, or a synchronization signal is determined based on the first index and the index of the synchronization signal block corresponding to the synchronization signal.

15. The method according to claim 12, characterized in that, In multiple different synchronization signal blocks, the transmission opportunities of multiple primary synchronization signals corresponding to the same first index are the same, wherein the index of the transmission opportunity of the primary synchronization signal is the index of the transmission opportunity of the primary synchronization signal in the multiple transmission opportunities included in a synchronization signal block.

16. The method according to claim 9, characterized in that, In one of the synchronization signal blocks, the transmission opportunities of the plurality of primary synchronization signals are all located on one side of the transmission opportunities of the secondary synchronization signals in the time domain; or, In a synchronization signal block, some of the transmission opportunities of the plurality of primary synchronization signals are located on one side of the transmission opportunity of the secondary synchronization signal in the time domain, while the other part of the transmission opportunities of the primary synchronization signals are located on the other side of the transmission opportunity of the secondary synchronization signal in the time domain.

17. The method according to claim 9, characterized in that, The synchronization signal block satisfies at least one of the following: The relative positional relationship between the transmission opportunities of the plurality of primary synchronization signals and the transmission opportunities of the secondary synchronization signals in a synchronization signal block is predetermined; or, In the plurality of synchronization signal blocks, the relative positional relationship between the transmission opportunities of the plurality of primary synchronization signals and the transmission opportunities of the secondary synchronization signals is the same.

18. The method according to claim 1, characterized in that, The method further includes at least one of the following: The first communication node receives first indication information from the second communication node, the first indication information being used to indicate the characteristics satisfied by the Q synchronization signals, so that the first communication node determines the first set of synchronization signals based on the first indication information. Receive second indication information from the second communication node, the second indication information including information about the synchronization signals included in the first synchronization signal set; The first set of synchronization signals is determined based on the transmission resources where the N synchronization signals are located. The transmission resources include at least one of the following: time domain resources, frequency domain resources, and code domain resources.

19. The method according to any one of claims 1 to 18, characterized in that, The different synchronization signals among the Q synchronization signals satisfy at least one of the following: The main synchronization signal sequences are different among the different synchronization signals; The auxiliary synchronization signal sequences are different between the different synchronization signals; The transmission opportunities of the primary synchronization signal differ between the different synchronization signals.

20. The method according to any one of claims 1 to 18, characterized in that, The method further includes: A plurality of second synchronization signal sets are determined, wherein the plurality of second synchronization signal sets include the first synchronization signal set.

21. The method according to claim 20, characterized in that, The plurality of second synchronization signal sets satisfy at least one of the following: The synchronization signals in the plurality of second synchronization signal sets are located on a single carrier; The synchronization signals in the plurality of second synchronization signal sets are located in a synchronization signal frequency domain search grid; The plurality of second synchronization signal sets are determined based on the transmission resources where the N synchronization signals are located; The first synchronization signal set among the plurality of second synchronization signal sets is selected by the first communication node.

22. The method according to any one of claims 1 to 21, characterized in that, The Q synchronization signals are located in one carrier wave; or... The Q synchronization signals are located in a synchronization signal frequency domain search grid.

23. The method according to any one of claims 1 to 21, characterized in that, The first signal satisfies at least one of the following: The first signal includes signals from the random access phase; The first signal includes index information for each of the N synchronization signals; There is a preset correspondence between the index information of the first signal and the N synchronization signals.

24. The method according to any one of claims 1 to 21, characterized in that, At least one of the following must be satisfied: The N synchronization signals correspond to A common channel demodulation reference signals, where A is a positive integer less than or equal to N; The Q synchronization signals correspond to P common channel demodulation reference signals, where P is a positive integer less than or equal to Q.

25. The method according to claim 24, characterized in that, At least one of the following must be satisfied: The A common channel demodulation reference signals belong to the P common channel demodulation reference signals; The common channel data corresponding to the P common channel demodulation reference signals include the same common information; Each of the Q synchronization signals corresponds to one of the P common channel demodulation reference signals, and each of the P common channel demodulation reference signals corresponds to one or more synchronization signals in the Q synchronization signals.

26. The method according to any one of claims 1 to 25, characterized in that, Each of the Q synchronization signals includes a primary synchronization signal and an auxiliary synchronization signal in a synchronization signal block, wherein one synchronization signal block and another synchronization signal block correspond to the same auxiliary synchronization signal transmission opportunity, and the transmission opportunity of the auxiliary synchronization signal is a set of resources occupied by the auxiliary synchronization signal, wherein the resources include at least one of the following: time domain resources, frequency domain resources, and the Q synchronization signals are located in one or more synchronization signal blocks.

27. A communication method, characterized in that, Applied to a second communication node, the method includes: Receive the first signal sent by the first communication node; The first signal includes information about N synchronization signals, which belong to the same first synchronization signal set. The first synchronization signal set includes Q synchronization signals, where N is a positive integer greater than or equal to 1 and Q is a positive integer greater than or equal to N.

28. The method according to claim 27, characterized in that, The Q synchronization signals include at least one first synchronization signal, wherein each first synchronization signal corresponds to multiple quasi-co-located regions, and each quasi-co-located region includes one or more transmission opportunities of the first synchronization signal; wherein, when multiple transmission opportunities are included, the multiple transmitters are not located in the time domain and / or frequency domain, and the first synchronization signals on the multiple transmission opportunities satisfy a quasi-co-located relationship.

29. The method according to claim 27, characterized in that, The Q synchronization signals occupy more than one synchronization signal block, or multiple synchronization signal blocks.

30. The method according to claim 29, characterized in that, When the Q synchronization signals occupy more than one synchronization signal block, the synchronization signal sequences corresponding to the Q synchronization signals are the same, and / or the main synchronization signal sequences corresponding to the Q synchronization signals are the same.

31. The method according to claim 27, characterized in that, Each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal, and the number of sequences in the candidate sequence set of the primary synchronization signal is greater than 3.

32. The method according to any one of claims 27 to 31, characterized in that, Each of the Q synchronization signals includes a primary synchronization signal and a secondary synchronization signal in a synchronization signal block. The synchronization signal block includes multiple transmission opportunities for the primary synchronization signals. One of the transmission opportunities for the primary synchronization signals is a resource set occupied by the primary synchronization signal. The multiple transmission opportunities for the primary synchronization signals occupy multiple resource sets respectively. The resources include at least one of the following: time-domain resources and frequency-domain resources. The Q synchronization signals are located in one or more synchronization signal blocks.

33. The method according to claim 32, characterized in that, In one of the synchronization signal blocks, the number of transmission opportunities for the primary synchronization signal is greater than the number of transmission opportunities for the secondary synchronization signal.

34. The method according to claim 33, characterized in that, The synchronization signal block satisfies at least one of the following: A synchronization signal block includes at least two transmission opportunities for the primary synchronization signal and only one transmission opportunity for the secondary synchronization signal. The transmission opportunities of the plurality of main synchronization signals in a synchronization signal block are respectively occupied by different synchronization signals; In one of the synchronization signal blocks, multiple main synchronization signals occupy different transmission opportunities among the multiple main synchronization signal transmission opportunities; Multiple master synchronization signals in one of the synchronization signal blocks occupy different master synchronization signal sequences in the transmission opportunity of one master synchronization signal; The number of candidate synchronization signals corresponding to one of the synchronization signal blocks is determined based on the number of primary synchronization signal sequences, the number of secondary synchronization signal sequences, and the number of transmission opportunities for the multiple primary synchronization signals; One of the synchronization signal blocks corresponds to one candidate synchronization signal set, and the candidate synchronization signal set includes at least one second synchronization signal set, wherein the first synchronization signal set is one of the at least one second synchronization signal sets.

35. The method according to claim 32, characterized in that, The first index of a synchronization signal in the synchronization signal block is determined based on the index of the main synchronization signal sequence, the index of the auxiliary synchronization signal sequence, and the index of the transmission opportunity of the main synchronization signal.

36. The method according to claim 27, characterized in that, The method further includes at least one of the following: Send a first indication message to the first communication node, the first indication message being used to indicate the characteristics satisfied by the Q synchronization signals, so that the first communication node determines the first set of synchronization signals according to the first indication message; Send a second indication message to the first communication node, the second indication message including information about the synchronization signals included in the first synchronization signal set.

37. The method according to any one of claims 27 to 36, characterized in that, The first set of synchronization signals is one of a plurality of second sets of synchronization signals.

38. The method according to claim 37, characterized in that, The plurality of second synchronization signal sets satisfy at least one of the following: The synchronization signals in the plurality of second synchronization signal sets are located on a single carrier; The synchronization signals in the plurality of second synchronization signal sets are located in a synchronization signal frequency domain search grid; The plurality of second synchronization signal sets are determined based on the transmission resources where the N synchronization signals are located; The first synchronization signal set among the plurality of second synchronization signal sets is selected by the first communication node.

39. The method according to any one of claims 27 to 38, characterized in that, At least one of the following must be satisfied: The N synchronization signals correspond to A common channel demodulation reference signals, where A is a positive integer less than or equal to N; The Q synchronization signals correspond to P common channel demodulation reference signals, where P is a positive integer less than or equal to Q.

40. A communication device, characterized in that, include: Memory and processor; Memory and processor are coupled; The memory is used to store instructions that can be executed by the processor; When the processor executes the instructions, it performs the method as described in any one of claims 1-39.

41. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1-39.

42. A computer program product, characterized in that, The computer program product includes computer program instructions that, when executed, implement the method as described in any one of claims 1-39.

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