CN111432466B

CN111432466B - Method and apparatus for transmitting synchronization signal

Info

Publication number: CN111432466B
Application number: CN201910024189.0A
Authority: CN
Inventors: 刘凤威; 袁世通; 邱晶; 陈磊
Original assignee: Chengdu Huawei Technology Co Ltd
Current assignee: Chengdu Huawei Technology Co Ltd
Priority date: 2019-01-10
Filing date: 2019-01-10
Publication date: 2021-07-09
Anticipated expiration: 2039-01-10
Also published as: CN111432466A; WO2020143685A1

Abstract

The application provides a method for sending a synchronization signal, which can improve the probability of mutual discovery between IAB nodes and does not influence the configuration of the existing protocol. The method comprises the following steps: the first IAB node determines a first time domain position set for sending a first synchronous signal and a second time domain position set for sending a second synchronous signal, and when the first time domain position set and the second time domain position set are positioned in the same half frame, the starting symbol indexes of the first time domain position set and the second time domain position set in the half frame are different; the first IAB node transmits the first synchronization signal at all or a portion of the time domain positions of the first set of time domain positions and/or transmits the second synchronization signal at all or a portion of the time domain positions of the second set of time domain positions.

Description

Method and apparatus for transmitting synchronization signal

Technical Field

The present application relates to the field of access and backhaul integrated IAB technologies, and in particular, to a method and an apparatus for sending a synchronization signal in an IAB system.

Background

In Long Term Evolution (LTE), a base station broadcasts a Common Reference Signal (CRS) for a terminal device to perform downlink synchronization and cell quality measurement. In the New Radio (NR), as the cellular system evolves to a high frequency, all downlink channels in the system are transmitted in a beam form. Such a signal providing downlink synchronization in the form of a beam is called a synchronization signal. The base station transmits the synchronization signals to all directions in time, and completes the transmission of the synchronization signals in all directions within a period of time (for example, 5 ms).

In a general scenario, only the base station needs to be considered to transmit a synchronization signal for the terminal device to measure. However, in an Integrated Access and Backhaul (IAB) system, besides the terminal device needs to measure the synchronization signal, the IAB node also needs to measure the synchronization signals sent by other IAB nodes to measure and maintain the backhaul link. Therefore, in the IAB system, the network device needs to transmit the synchronization signal not only to the terminal device over the access link but also to other network devices over the backhaul link.

Currently, the mapping position of the synchronization signal of the access link in a half frame on the time domain has been defined in the standard protocol. Therefore, the resource mapping of the synchronization signal of the backhaul link in the time domain needs to be designed in consideration of many factors. For example, the synchronization signal of the backhaul link cannot collide with the mapping position of the synchronization signal of the access link, and at the same time, the purpose of mutual discovery and mutual measurement between IAB nodes in the IAB system is also achieved, and especially under the condition that there are many IAB nodes, it is necessary to measure as many IAB nodes as possible. For another example, the synchronization signal of the backhaul link cannot collide with uplink resources such as random access resources, and some configurations of the existing protocol, such as Time Division Duplex (TDD) configurations, are not affected as much as possible. At present, no solution has been devised to meet the above requirements.

Disclosure of Invention

The application provides a method for sending a synchronization signal, provides a mapping scheme of the synchronization signal of a return link on a time domain, can improve the probability of mutual discovery between IAB nodes, and does not influence the configuration of the existing protocol.

In a first aspect, the present application provides a method for transmitting a synchronization signal, the method comprising: the first IAB node determines a first time domain position set for sending a first synchronous signal and a second time domain position set for sending a second synchronous signal, and when the first time domain position set and the second time domain position set are positioned in the same half frame, the starting symbol indexes of the first time domain position set and the second time domain position set in the half frame are different; the first IAB node transmits the first synchronization signal at all or a portion of the time domain positions of the first set of time domain positions and/or transmits the second synchronization signal at all or a portion of the time domain positions of the second set of time domain positions.

The method for sending the synchronization signal provided by the application provides a configuration scheme of the synchronization signal of the return link in the IAB communication system by considering a plurality of factors, such as TDD configuration of the existing protocol, configuration of the synchronization signal of the access link on a time domain, requirement of uplink transmission resources and the like, and can improve the probability of mutual discovery between IAB nodes without influencing the configuration of the existing protocol.

With reference to the first aspect, in some implementations of the first aspect, when the first set of time domain positions and the second set of time domain positions are located in different half frames, the symbols included in the first set of time domain positions and the symbols included in the second set of time domain positions partially overlap or completely overlap.

The first set of time domain positions and the second set of time domain positions are located in different half frames, i.e. the first synchronization signal and the second synchronization signal are configured in different half frames. At this time, the mapping position of the first synchronization signal on the time domain is more flexible.

With reference to the first aspect, in certain implementations of the first aspect, when an operating frequency band of the communication system is greater than 6GHz and a subcarrier spacing SCS is 240KHz, a starting symbol index of the first synchronization signal within a field is: {8,12,16,20,32,36,40,44} +56 · n, n ═ 10,11,12,13,15,16,17, 18.

In this embodiment, if the network device configures two IAB nodes to respectively transmit the first synchronization signal and the second synchronization signal within a half frame, the neighboring node can simultaneously measure two synchronization signals, i.e., the first synchronization signal and the second synchronization signal, within one measurement window, thereby increasing the probability of node discovery.

With reference to the first aspect, in certain implementations of the first aspect, when an operating frequency band of the communication system is greater than 6GHz and a subcarrier spacing SCS is 240KHz, the first set of time domain locations is configured to be distributed dispersedly within a field, and a starting symbol index of the first synchronization signal within the field is: {8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,5,6,10,11,15, 16.

With reference to the first aspect, in certain implementations of the first aspect, the starting symbol index of the first synchronization signal within the half frame further includes: {8,12,16,20,32,36,40,44} +56 · n, n ═ 2,3,7,8,12,13,17, and 18.

In the embodiment of the application, the first synchronization signal is distributed in 5ms, so that too few uplink time slots can be avoided. The IAB node will have more uniform uplink time slots for uplink scheduling, such as Random Access Channel (RACH) transmission and reception.

With reference to the first aspect, in certain implementations of the first aspect, when an operating frequency band of the communication system is greater than 6GHz and a subcarrier spacing SCS is 240KHz, the first set of time domain locations is configured to be distributed dispersedly within a field, and a starting symbol index of the first synchronization signal within the field is: {8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,2,3,10,11,12, 13.

With reference to the first aspect, in certain implementations of the first aspect, the starting symbol index of the first synchronization signal within the half frame further includes: {8,12,16,20,32,36,40,44} +56 · n, n ═ 5,6,7,8,15,16,17, and 18.

With reference to the first aspect, in certain implementations of the first aspect, when an operating frequency band of the communication system is less than 3GHz and the SCS is 15KHz, a starting symbol index of the first synchronization signal within a half frame is: {2,8} +14 · n, n ═ 2, 3.

With reference to the first aspect, in certain implementations of the first aspect, when an operating frequency band of the communication system is less than 3GHz and the SCS is 15KHz, a starting symbol index of the first synchronization signal within a half frame is: {2,8} +14 · n, n ═ 3, 4.

With reference to the first aspect, in certain implementations of the first aspect, when an operating frequency band of the communication system is less than 6GHz and the SCS is 30KHz, a starting symbol position of the first synchronization signal in a half frame is: {4,8,12,16,20} +28 · n, n takes on a value equal to any one element in the set {1,2,3,4 }.

With reference to the first aspect, in certain implementations of the first aspect, when an operating frequency band of the communication system is greater than or equal to 3GHz and less than or equal to 6GHz, a starting symbol index of the first synchronization signal within a half frame is: {4,8,16,20} +28 · n, n takes on a value equal to any two elements in the set {1,2,3,4 }.

With reference to the first aspect, in certain implementations of the first aspect, the first synchronization signal and the second synchronization signal satisfy one or more of: the subcarrier intervals of the first synchronization signal and the second synchronization signal are different; or the number of symbols occupied by the first synchronization signal and the second synchronization signal in a half frame is not equal.

With reference to the first aspect, in some implementations of the first aspect, the determining, by the first IAB node, a first set of time domain locations to transmit the first synchronization signal includes: the first IAB node acquires configuration information, wherein the configuration information is used for indicating an offset value of n, and the n is a parameter defined by a protocol and used for determining a starting symbol index of a second synchronization signal; the first IAB node determines a first starting symbol index set of the first synchronous signal according to a calculation formula of a second starting symbol index set of the second synchronous signal and the offset value of the n; the first IAB node determines a first set of time domain locations based on the first set of starting symbol indices.

With reference to the first aspect, in some implementation manners of the first aspect, the determining, by the first IAB node, a first starting symbol index set of the first synchronization signal according to a calculation formula of a second starting symbol index set of the second synchronization signal and the offset value of the n includes: and the first IAB node determines a first initial symbol index set according to the value of the required offset of n and the offset value corresponding to the value of the required offset.

In a second aspect, the present application provides an apparatus for transmitting a synchronization signal, the apparatus having the function of implementing the method in the first aspect and any possible implementation manner thereof. The functions can be realized by hardware, and the functions can also be realized by executing corresponding software by hardware. The hardware or software includes one or more units corresponding to the above functions.

In a third aspect, the present application provides a network device comprising a processor and a memory. The memory is used for storing a computer program, and the processor is used for calling and executing the computer program stored in the memory, so that the network device executes the method in the first aspect or any possible implementation manner of the first aspect.

Optionally, the network device further comprises a communication interface. The communication interface may be a transceiver or an input-output interface.

In a fourth aspect, the present application provides a computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of the first aspect or any possible implementation manner of the first aspect.

In a fifth aspect, the present application provides a chip comprising a processor. The processor is configured to read and execute the computer program stored in the memory to perform the method of the first aspect or any possible implementation manner of the first aspect.

Optionally, the chip further comprises a memory, the memory is connected with the processor through a circuit or a wire, and the memory is used for storing the computer program.

Further optionally, the chip further comprises a communication interface.

In a sixth aspect, the present application further provides a computer program product, which includes computer program code, when the computer program code runs on a computer, the computer is caused to execute the method in the first aspect and any one of the possible implementation manners.

According to the method for sending the synchronous signal, by considering a plurality of factors, such as TDD configuration of the existing protocol, configuration of the synchronous signal of the access link on a time domain, requirement of uplink transmission resources and the like, a configuration scheme of the synchronous signal of the return link in the IAB communication system is provided, the configuration of the existing protocol is not influenced, and the probability of mutual discovery between the IAB nodes is improved.

Drawings

Fig. 1 is an architecture diagram of an IAB system suitable for use in the solution of the present application.

Fig. 2 is a specific example of an IAB system.

Fig. 3 is a schematic structural diagram of an IAB node.

Fig. 4 is a schematic diagram of a structure of the second synchronization signal.

Fig. 5 is an example of a mapping position of the first synchronization signal in the time domain.

Fig. 6 is yet another example of the mapping position of the first synchronization signal in the time domain.

Fig. 7 is still another example of the mapping position of the first synchronization signal in the time domain.

Fig. 8 is yet another example of the mapping position of the first synchronization signal in the time domain.

Fig. 9 is yet another example of the mapping position of the first synchronization signal in the time domain.

Fig. 10 is yet another example of a mapping position of the first synchronization channel on the time domain.

Fig. 11 is still another example of the mapping position of the first synchronization signal in the time domain.

Fig. 12 is still another example of the mapping position of the first synchronization signal in the time domain.

Fig. 13 is still another example of the mapping position of the first synchronization signal in the time domain.

Fig. 14 is still another example of the mapping position of the first synchronization signal in the time domain.

Fig. 15 is an example of cross-field mapping of the first synchronization signal in the time domain.

Fig. 16 is a diagram illustrating a method 300 for transmitting a synchronization signal provided herein.

Fig. 17 is yet another example of determining the mapping position of the first synchronization signal within a field.

Fig. 18 is yet another example of determining the mapping position of the first synchronization signal within a field.

Fig. 19 is yet another example of determining the mapping position of the first synchronization signal within a field.

Fig. 20 is a schematic block diagram of an apparatus 500 for transmitting a synchronization signal according to the present application.

Fig. 21 is a schematic structural diagram of a network device 1000 provided in the present application.

Detailed Description

The technical solution in the present application will be described below with reference to the accompanying drawings.

The names of all nodes and messages in the present application are only names set for convenience of description, and the names may be different in an actual network, and it should not be understood that the present application defines the names of various nodes and messages. On the contrary, any names having the same or similar functions as the nodes or messages used in the present application are considered as methods or equivalent substitutes of the present application and are within the protection scope of the present application, and are not described in detail below.

The communication system mentioned in the embodiments of the present application includes but is not limited to: a narrowband internet of things (NB-IoT) system, a Wireless Local Access Network (WLAN) system, an LTE system, a next generation 5G mobile communication system, or a communication system after 5G, such as an NR, a device to device (D2D) communication system, and the like.

Referring to fig. 1, fig. 1 is an architecture diagram of an IAB system suitable for use with the teachings of the present application. As shown in fig. 1, an IAB system at least includes a base station 100, one or more terminal equipments (terminal)101 served by the base station 100, one or more relay nodes (i.e., IAB nodes) 110, and one or more terminal equipments 111 served by the IAB nodes 110. Typically, the base station 100 is referred to as a donor next generation node B (DgNB), and the IAB node 110 is connected to the base station 100 via a wireless backhaul link 113. The Donor base station is also referred to as a Donor node in this application, i.e., a Donor node.

The base station 100 includes but is not limited to: an evolved node B (eNB), a Radio Network Controller (RNC), a Node B (NB), a Base Station Controller (BSC), a Base Transceiver Station (BTS), a home evolved NodeB (HNB), a Base Band Unit (BBU), an evolved LTE (LTE) base station, an NR base station (neighbor B, gw), and the like.

Terminal devices include, but are not limited to: user Equipment (UE), a mobile station, an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a terminal, a wireless communication device, a user agent, a station (station, ST) in a Wireless Local Access Network (WLAN), a cellular phone, a cordless phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capability, a computing device, other processing devices connected to a wireless modem, a vehicle mounted device, a wearable device, a mobile station in a future 5G network, and a terminal device in a future evolved Public Land Mobile Network (PLMN) network, etc. The IAB node is a specific name of a relay node, and is not limited to the configuration of the present application, and may be one of the base station and the terminal device having a relay function, or may be in a separate device form.

The IAB system may also include a plurality of other IAB nodes, e.g., IAB node 120 and IAB node 130. The IAB node 120 is connected to the IAB node 110 over a wireless backhaul link 123 for access to the network. The IAB node 130 is connected to the IAB node 110 over a wireless backhaul link 133 for access to the network. IAB node 120 serves one or more terminal devices 121 and IAB node 130 serves one or more terminal devices 131. In fig. 1, both IAB node 110 and IAB node 120 are connected to the network through a wireless backhaul link. In the present application, the wireless backhaul links are all from the perspective of the relay node, e.g., wireless backhaul link 113 is the backhaul link of IAB node 110 and wireless backhaul link 123 is the backhaul link of IAB node 120. As shown in fig. 1, one IAB node, e.g., 120, may connect to another IAB node 110, and thus to the network, via a wireless backhaul link, e.g., 123. Also, the relay node may be connected to the network through a multi-stage wireless relay node. It should be understood that the IAB node is used in this application for descriptive purposes only and does not mean that the solution of this application is used only for NR, and in this application, the IAB node may refer to any node or device having a relay function in a general way, and the use of the IAB node and the relay node in this application should be understood to have the same meaning.

In addition, the following basic terms or concepts are also referred to in this application.

And accessing a link: link between UE and IAB node or IAB donor node (IAB donor). Alternatively, the access link may comprise a radio link used by a node to communicate with its subordinate nodes. The access link includes an uplink access link and a downlink access link. The uplink access link is also referred to as uplink transmission of the access link, and the downlink access link is also referred to as downlink transmission of the access link.

A return link: a link between an IAB node and an IAB child node (IAB child node) or an IAB parent node (IAB parent node). The backhaul link includes a downlink transmission link with the IAB child node or the IAB parent node, and an uplink transmission link with the IAB child node or the IAB parent node. An IAB node transmitting data to an IAB parent node or receiving an uplink transmission from an IAB child node is referred to as an uplink transmission of a backhaul link. The reception of data transmission by an IAB parent node or the transmission of data to an IAB child node is called downlink transmission of a backhaul link. To distinguish between the UE and the IAB node, the backhaul link between the IAB node and the IAB parent node is called a superior backhaul link (parent BH), and the backhaul link between the IAB node and the IAB child node is called a subordinate backhaul link (child BH).

In general, a lower node may be regarded as one terminal device of an upper node. It should be understood that in the integrated access and backhaul system shown in fig. 1, one IAB node is connected to one upper node. However, in future relay systems, in order to improve the reliability of the wireless backhaul link, one IAB node, e.g., 120, may have multiple upper nodes to serve one IAB node at the same time, and the IAB node 130 in fig. 1 may also be connected to the IAB node 120 through the backhaul link 134, that is, the IAB node 110 and the IAB node 120 are both considered as upper nodes of the IAB node 130. The names of the IAB nodes 110,120, 130 are not limited to the scenario or network in which they are deployed, and may be any other names such as relay, RN, etc. The use of IAB nodes in this application is only needed for ease of description.

In fig. 1, the wireless link 102,112,122,132,113,123,133,134 may be a bidirectional link including uplink and downlink transmission links, and in particular, the wireless backhaul link 113,123,133,134 may be used for the upper node to provide service for the lower node, such as the upper node 100 providing wireless backhaul service for the lower node 110. It should be appreciated that the uplink and downlink of the backhaul link may be separate, i.e., the uplink and downlink are not transmitted through the same node. The downlink transmission refers to transmission of information or data to a lower node, such as the node 100, and the uplink transmission refers to transmission of information or data to a lower node, such as the node 110, and the upper node, such as the node 100. The node is not limited to being a network node or a terminal device, for example, in the D2D scenario, a terminal device may serve as a relay node for other terminal devices. The wireless backhaul link may in turn be an access link in some scenarios, such as backhaul link 123 may also be considered an access link for node 110, and backhaul link 113 is also an access link for node 100. It should be understood that the above-mentioned upper node may be a base station, and may also be a relay node, and the lower node may also be a terminal device having a relay function, for example, in the D2D scenario, the lower node may also be a terminal device.

Referring to fig. 2, fig. 2 is a specific example of an IAB system. In the IAB system shown in fig. 2, a donor base station, IAB node 1, IAB node 2, UE1 and UE2 are included. The link between the donor base station and the IAB node 1, and the link between the IAB node 1 and the IAB node 2 are backhaul links. The link between the UE1 and the donor base station and the link between the UE2 and the IAB node 1 are access links.

Referring to fig. 3, fig. 3 is a schematic structural diagram of an IAB node. As shown in fig. 3, a Mobile Terminal (MT) function is defined as one component similar to a UE. In IAB, the MT is referred to as a function residing on the IAB node. Since the MT functions like a general UE, the IAB node can be considered to access an upper node or network through the MT.

Distributed Unit (DU) functionality is relative to Centralized Unit (CU) functionality. In NR, the function of the base station is divided into two parts, called CU-DU separation. From the perspective of the protocol stack, the CU includes an RRC layer and a PDCP layer of the LTE base station, and the DU includes a Radio Link Control (RLC) layer, a Medium Access Control (MAC) layer, and a Physical (PHY) layer of the LTE base station. In a common 5G base station deployment, the CU and the DU can be physically connected by optical fibers, and there is logically a specially defined F1 interface for communication between the CU and the DU. From the functional point of view, the CU is mainly responsible for radio resource control and configuration, cross-cell mobility management, bearer management, and the like. The DU is mainly responsible for scheduling, physical signal generation and transmission.

The following describes the method for transmitting the synchronization signal provided in the present application in detail.

The method for sending the synchronization signal is applied to an IAB communication system, and the IAB communication system can comprise a host base station, one or more IAB nodes and one or more terminal devices. Such as the IAB system shown in fig. 1 or fig. 2.

The synchronization signal is also called a synchronization signal block, a synchronization signal/physical broadcast channel block (SSB block), or an SS/PBCH block, etc.

The first IAB node in this application refers to any one of the IAB nodes in the IAB communication system, and the second IAB node is another IAB node different from the first IAB node.

The embodiments of the present application relate to two kinds of synchronization signals, which are hereinafter referred to as a first synchronization signal and a second synchronization signal, respectively. The first synchronization signal is used for other IAB nodes than the first IAB node to measure. The second synchronization signal is used for synchronization and/or measurement by the terminal device in the IAB system. In the present application, a set of symbols used for transmitting the first synchronization signal in the time domain is referred to as a first symbol set, and a set of symbols used for transmitting the second synchronization signal is referred to as a second symbol set.

It should be noted that the start symbol index of the synchronization signal in the time domain can be used to describe the mapping position of the synchronization signal in the time domain. The starting set of symbol indices of the first synchronization signal is determined, i.e. it is determined on which symbols within the half-frame in the time domain the first synchronization signal is transmitted, i.e. the first set of time domain positions is determined. Likewise, a second set of starting symbol indices of the second synchronization signal, i.e. a second set of time domain positions for transmitting the second synchronization signal, is determined.

It is to be understood that the first set of time domain positions comprises symbols for transmitting a first synchronization signal and the second set of time domain positions comprises symbols for transmitting a second synchronization signal. Alternatively, the first set of time domain positions may also be referred to as a first set of symbols. The second set of time domain positions may also be referred to as a second set of symbols.

Therefore, a first set of starting symbol indices and a second set of starting symbol indices are also introduced in the present application. The first set of starting symbol indexes refers to a set of starting symbol indexes of the first synchronization signal in the time domain. The second set of starting symbol indices refers to a set of starting symbol indices of the second synchronization signal in the time domain.

It will be appreciated that the first set of symbols comprises the first set of starting symbol indices, i.e. the first set of starting symbol indices is a proper subset of the first set of symbols. Likewise, the second starting symbol set is a proper subset of the second symbol set.

Alternatively, the first synchronization signal may also be referred to as a synchronization signal of the backhaul link. The second synchronization signal may also be referred to as a synchronization signal of the access link.

The structure of the second synchronization signal can be seen in fig. 4. Fig. 4 is a schematic diagram of a structure of the second synchronization signal. As shown in fig. 4, the second synchronization signal is composed of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH).

In this application, the structure of the first synchronization signal may be the same as that of the second synchronization signal. Alternatively, the first synchronization signal may include only the PSS and the SSS, and not the PBCH. Still alternatively, the structure of the first synchronization signal is to replace the PBCH of fig. 4 with other contents. As a possible scheme, the subcarrier intervals of the first synchronization signal and the second synchronization signal may be different, or the number of symbols occupied by the first synchronization signal and the second synchronization signal in a field is not equal. Of course, the number of symbols occupied by the first synchronization signal and the second synchronization signal in a half frame may be equal. The structure of the first synchronization signal is not limited in the present application, but the mapping position of the first synchronization signal on the time domain is mainly concerned, specifically, the design of the resource mapping at the time slot level.

The mapping scheme of the first synchronization signal in the time domain provided by the present application is described below.

Scheme 1

The first synchronization signal and the second synchronization signal are located in the same half frame in the time domain.

When the first synchronization signal and the second synchronization signal are located in the same half-frame (half-frame), as a possible implementation, the start symbol indices of the first synchronization signal and the second synchronization signal in the half-frame are all different, i.e. the first start symbol index set and the second start symbol index set do not intersect. As another possible implementation, the first synchronization signal and the second synchronization signal have the same start symbol index portion within a field, i.e. the first start symbol index set and the second start symbol index set intersect. However, the first set of starting symbol indices and the second set of starting symbol indices are not identical.

Scheme 2

The first synchronization signal and the second synchronization signal are located in different half frames in the time domain.

When the first synchronization signal and the second synchronization signal are located in different half frames, the start symbol indexes of the first synchronization signal and the second synchronization signal in the half frames may be all the same, or partially the same, or all the same. That is, the first set of starting symbol indices and the second set of starting symbol indices may be disjoint, or partially overlapping, or fully overlapping.

Based on the design principles of the scheme 1 and the scheme 2, the initial symbol indexes of the first synchronization signal in the field are also designed differently according to the working frequency band and the difference of the subcarrier intervals of the communication system, which will be described below.

(1) The working frequency band of the communication system is more than 6GHz, and the subcarrier spacing is 240 KHz.

The initial symbol index of the first synchronization signal within a field is:

{8,12,16,20,32,36,40,44}+56·n,n＝10,11,12,13,15,16,17,18。

here, the starting symbol index of the first synchronization signal in the field includes a symbol index calculated by substituting n into {8,12,16,20,32,36,40,44} +56 · n, for each value of {10,11,12,13,15,16,17,18 }. For example, substituting {8,12,16,20,32,36,40,44} +56 · n with n being 10 results in 568,572,576,580,582,586,600 and 604 symbol indices of 8 total. n traverses the above 8 values to obtain 64 symbol indexes. These 64 symbol indices constitute the first set of starting symbol indices described in this application.

The calculation process of the starting symbol index in the following embodiments is similar and will not be described again.

Referring to fig. 5, fig. 5 is an example of a mapping position of the first synchronization signal on the time domain. As shown in fig. 5, the first synchronization signal and the second synchronization signal are located in the same half frame. The start symbol index of the first synchronization signal is different from the start symbol index of the second synchronization signal, and the first symbol set and the second symbol set do not intersect with each other, that is, the first synchronization signal and the second synchronization signal are orthogonal.

The initial symbol index of the first synchronization signal within a field is:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,5,6,10,11,15, 16.

In the existing protocol, the measurement window for the IAB node to measure the synchronization signal may be 5ms, so in the embodiment shown in fig. 5, the first synchronization signal and the second synchronization signal are configured in the same half frame (i.e. within 5 ms). If the network device configures two IAB nodes to respectively send the first synchronization signal and the second synchronization signal in a field, the adjacent nodes can simultaneously measure the two synchronization signals of the first synchronization signal and the second synchronization signal in a measurement window, and the probability of node discovery is increased.

In addition, on the symbol shown in fig. 5 where the first synchronization signal is not transmitted, the network device may configure an uplink transmission opportunity, for example, a random access resource, which may improve flexibility of system scheduling.

It should be noted that the TDD configuration shown in fig. 5 is only an example, so as to facilitate understanding of the mapping position of the first synchronization signal in the time domain. The TDD configuration in the following embodiments is only for reference and will not be described again.

Referring to fig. 6, fig. 6 is yet another example of a mapping position of the first synchronization signal on the time domain. As shown in fig. 6, the first synchronization signal is distributed dispersedly in a half frame and is not concentrated in the first 2.5ms of 5 ms.

The first synchronization signal is mapped to a position complementary to the position shown in fig. 6, resulting in another mapping scheme of the first synchronization signal in the time domain, as shown in fig. 7. Fig. 7 is still another example of the mapping position of the first synchronization signal in the time domain.

The initial symbol index of the first synchronization signal within a field is:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 2,3,7,8,12,13,17, and 18.

Comparing fig. 6 and fig. 7, it can be found that the time domain position for transmitting the first synchronization signal shown in fig. 6 occupies the downlink time slot of the TDD configuration, and the time domain position for transmitting the first synchronization signal shown in fig. 7 occupies the flexible time slot of the TDD configuration. In the embodiment of the present application, the first synchronization signal is mapped to positions of the downlink timeslot and the flexible timeslot in the TDD configuration, which are called complementary positions.

Here, the uplink time slot of the TDD configuration is "D" as shown in fig. 6 or fig. 7, and the flexible time slot is "F" as shown in fig. 6 or fig. 7. Wherein "D" represents a downlink, "F" represents a flexible, and "U" represents an uplink.

It can be seen that in the examples of fig. 6 and 7, the first synchronization signal is distributed within 5ms to avoid too few uplink timeslots, especially when the AC-SSB employs 120KHz subcarrier spacing. The IAB node will have more uniform uplink time slots for uplink scheduling, such as Random Access Channel (RACH) transmission and reception.

In addition, if the donor base station instructs two IAB nodes to transmit the first synchronization signal at complementary positions within a half frame, respectively, the neighboring nodes may measure two IAB nodes simultaneously within one half frame, and may also increase the node discovery probability. Meanwhile, the time for completing mutual measurement between the IAB nodes is reduced, and the measurement efficiency is improved.

As another example, the present application also proposes another scheme in which the first synchronization signal is distributed dispersedly within 5 ms. This will be explained with reference to fig. 8.

Referring to fig. 8, fig. 8 is yet another example of a mapping position of the first synchronization signal on the time domain. The mapping position of the first synchronization signal in the time domain is shown as SSB candidates (SSB candidates)1 in fig. 8. At this time, the initial symbol index of the first synchronization signal in a field is:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,2,3,10,11,12, 13.

Alternatively, the mapping position of the first synchronization signal in the time domain is as shown by SSB candidate 2 in fig. 8. At this time, the initial symbol index of the first synchronization signal in a field is:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 5,6,7,8,15,16,17, and 18.

The two mapping positions shown in fig. 8 may be defined by a protocol, or one of the mapping positions may be configured by the donor base station, and the other IAB node receives the same configuration information and a complementary indication information, where the complementary indication information is used to instruct the IAB node to transmit the first synchronization signal using the complementary position indicated by the configuration information.

In the embodiment shown in fig. 8, two IAB nodes may be configured to transmit the first synchronization signal using complementary positions within one half frame, and two IAB nodes may be measured simultaneously by neighboring IAB nodes within one half frame. Meanwhile, the IAB node has more sufficient time to transmit downlink signals or receive uplink signals within 5 ms.

(2) The working frequency band of the communication system is less than 3GHz, and the subcarrier spacing is 15 KHz.

As an alternative implementation manner, the starting symbol index of the first synchronization signal in the field is: {2,8} +14 · n, n ═ 2, 3. As shown in fig. 9, fig. 9 is yet another example of the mapping position of the first synchronization signal in the time domain.

As another alternative implementation, the starting symbol index of the first synchronization signal within a field is: {2,8} +14 · n, n ═ 3, 4. As shown in fig. 10, fig. 10 is yet another example of the mapping position of the first synchronization signal in the time domain.

When the access link adopts the subcarrier interval of 15kHz and works below 6GHz, the synchronization signal of the backhaul link adopts the mapping position shown in fig. 9 or fig. 10, so that at least two IAB nodes can send the synchronization signal in the same half frame, and other adjacent nodes can measure multiple IAB nodes in one measurement window.

(3) The working frequency band of the communication system is less than 6GHz, and the subcarrier spacing is 30 KHz.

The initial symbol index of the first synchronization signal within a field is:

{4,8,12,16,20} +28 · n, n takes on a value equal to any one element in the set {1,2,3,4 }.

For example, when n is 2, the mapping position of the first synchronization signal in the time domain is as shown in fig. 11, and fig. 11 is still another example of the mapping position of the first synchronization channel in the time domain.

When the access link adopts 30kHz subcarrier spacing and works below 6GHz, the synchronization signal of the backhaul link adopts the mapping position shown in FIG. 11, so that at least two IAB nodes can send the synchronization signal in the same half frame, and other adjacent nodes can measure a plurality of IAB nodes in a measurement window.

(4) The working frequency band of the communication system is greater than or equal to 3GHz and less than or equal to 6GHz (namely 3 GHz-6 GHz), and the subcarrier spacing is 30 KHz.

The initial symbol index of the first synchronization signal within a field is:

{4,8,16,20} +28 · n, n takes on a value equal to any two elements in the set {1,2,3,4 }.

For example, when n is 2,3, the mapping of the first synchronization signal in the time domain is shown in fig. 12, and fig. 12 is yet another example of the mapping position of the first synchronization signal in the time domain.

In particular, when n is 1,3, it is advantageous to adapt to TDD configuration period of 2.5 ms. Fig. 13 is yet another example of the mapping position of the first synchronization signal in the time domain, as in fig. 13. In fig. 13, the first synchronization signal is distributed within 5 ms.

For another example, when n is 2,4, the distribution of the first synchronization signal within 5ms is shown in fig. 14, and fig. 14 is another example of the mapping position of the first synchronization signal on the time domain.

In the configuration shown in fig. 13 and 14, if the donor base station configures n of one IAB node to be 1,3 and configures n of another IAB node to be 2,4, and the TDD employs a specific configuration, it is also possible to measure two IAB nodes within 5 ms.

The positions of the first synchronization signal in the time domain shown in fig. 5-14 above are designed according to the principle that the first synchronization signal is transmitted in a half frame. However, considering that the second synchronization signal is used for the terminal device to perform measurement, in order to enable the terminal device to perform better synchronization, the second synchronization signal transmitted by the IAB node to the terminal device on the access link needs to be located in one half frame. While the first synchronization signal is sent by one IAB node (e.g., the first IAB node) to other IAB nodes over the backhaul link and does not need to have timing and synchronization functions. Therefore, in view of the difference in function between the first synchronization signal and the second synchronization signal, the first synchronization signal and the second synchronization signal may be designed based on different design principles.

Thus, as one implementation, the first synchronization signal may be mapped across half a frame in the time domain.

Referring to fig. 15, fig. 15 is an example of a cross-field mapping of the first synchronization signal in the time domain. As shown in fig. 15, the first synchronization signal may be configured across a half frame in the time domain as follows.

Mode 1

The order of n is configured explicitly.

For example, the IAB node displays configuration n as 11,12,13,15,16,17,18,0,1,2,3,5,6,7, 8.

Mode 2

The offset (offset) of n is explicitly configured.

For example, as shown in fig. 15, the subcarrier SCS is 120KHz, the offset of the IAB node configuration n is 10. That is, each value of n is offset by 10 symbols over the value specified by the protocol.

Mode 3

IAB node display configuration n is 11,12,13,15,16,17,18,20,21,22,23,25,26,27, 28.

The manner of mapping the first synchronization signal across half frames as shown in fig. 15 can make the configuration and measurement of the first synchronization signal more flexible.

In the above, the mapping scheme of the first synchronization signal in the time domain is described in detail, and the following describes a process of the IAB node transmitting the first synchronization signal and/or the second synchronization signal.

Referring to fig. 16, fig. 16 is a schematic diagram of a method 300 for transmitting a synchronization signal provided by the present application. Method 300 is applicable in a communication system including a donor base station, one or more IAB nodes, and one or more terminal devices. The method 300 includes steps 310-320.

310. The first IAB node determines a first set of symbols to transmit the first synchronization signal and a second set of symbols to transmit the second synchronization signal.

The first synchronization signal is used for being measured by other IAB nodes except the first IAB node in the communication system, and is mainly used for mutual measurement and mutual discovery among the IAB nodes. The second synchronization signal is for measurement by one or more terminal devices in the communication system. In other words, the first synchronization signal is transmitted by the first IAB node over the backhaul link to other IAB nodes in the communication system, and the second synchronization signal is transmitted by the first IAB node over the access link to the terminal device in the communication system.

As described above, when the first synchronization signal and the second synchronization signal are configured in different half frames, the start symbol index of the first synchronization signal included in the first start symbol index set and the start symbol index of the second synchronization signal included in the second start symbol index set may be partially the same, or all the different.

When the first synchronization signal and the second synchronization signal are configured in the same half frame, the start symbol index of the first synchronization signal included in the first start symbol index set and the start symbol index of the second synchronization signal included in the second start symbol index set may be all different or partially different.

For specific values of the start symbol index of the first synchronization signal in the field, refer to the descriptions in fig. 5 to fig. 15 above, and are not described in detail here.

The first IAB node determining to transmit the first set of symbols of the first synchronization signal may include a variety of ways. Several ways are listed below as examples.

Mode 1

The protocol defines that each first symbol set corresponds to an index. The host base station or the core network device indicates the time domain resource position of the first IAB node for sending the first synchronization signal by sending the index defined by the protocol to the first IAB node.

For example, the protocol defines pattern 1, pattern 2, and pattern 3 to correspond to 3 different first symbol sets, respectively. If the first IAB node receives index 3, it may determine to transmit the first synchronization signal on the symbols included in the first symbol set corresponding to "pattern 3". For another example, the protocol may also define a correspondence relationship between a case 1, a case 2, a case 3, and …, or a case a, a case B, a case C, and a case … and each first symbol set, which is not limited in this application.

Mode 2

The first IAB node receives configuration information from the donor base station or the core network device, and the configuration information is used for the first IAB node to determine the first symbol index set.

Here, the core network device may be, for example, an operation and maintenance (O & M) server.

As an optional implementation manner, the donor base station or the core network device may indicate one or more of the following information through the configuration information: and calculating a formula of the initial symbol index of the first synchronization signal, a value set of n, a value of a subcarrier spacing SCS, an offset value of n and the like.

In this application, the offset value of n is in units of symbols. The magnitude of the offset value indicates the number of symbols that are offset backward in the time domain. That is, in the present application, the offset value of n is offset backward in time by several symbols by default.

It should be noted that, when the configuration information is used to indicate the offset value of n, a variety of specific implementation manners may be included according to different offset manners.

(1) The first synchronization signal is shifted in all starting symbols within a field.

In other words, the first synchronization signal is offset as a whole with respect to the second synchronization signal.

In one implementation, the configuration information need only indicate an offset value for n (hereinafter referred to as n _ offset).

The first IAB node determines the first set of symbol indices in combination with the n _ offset indicated by the configuration information according to a second set of symbols defined by the protocol for transmitting the second synchronization signal.

Currently, the protocol specifies different operating frequency bands and mapping positions of the second synchronization signal in the time domain at subcarrier intervals. For example, when the operating frequency band is >6GHz and the subcarrier spacing SCS is 240KHz, the protocol gives the calculation formula of the start symbol index of each SSB block as follows: {8,12,16,20,32,36,40,44} +56 · n, n ═ 0,1,2,3,5,6,7, 8. Assuming that n _ offset indicated by the configuration information is 10, the first IAB determines n for calculating a start symbol index of the first synchronization signal in a field to be 10,11,12,13,15,16,17,18 according to a value of n specified in the protocol and n _ offset indicated by the configuration information is 10. In combination with the operating frequency band of the communication system and the calculation formula {8,12,16,20,32,36,40,44} +56 · n for the start symbol of the synchronization signal when SCS is 240KHz, the first IAB node may determine a first set of start symbol indices of the first synchronization signal within a field.

In another implementation, the configuration information indicates values of n _ offset and SCS.

For example, the configuration information indicates that SCS is 30KHz and n _ offset is 3. When the SCS defined by the protocol is 30KHz, the calculation formula of the start symbol index of the second synchronization signal is {4,8,16,20} +28 · n, where n is 0, 1. Therefore, n is 3,4 for calculating the start symbol index of the first synchronization signal within the field. That is, n after the offset is 3, 4. As shown in fig. 17. Fig. 17 is yet another example of determining the mapping position of the first synchronization signal within a field.

(2) The first synchronization signal is offset at the start symbol portion within a field.

In this case, the first IAB node determines the value of n that needs to be offset and its offset value.

In one implementation, the configuration information explicitly indicates the value of n that needs to be offset and the common offset value. For example, the configuration information indicates that n ═ {5,6,7,8} and n _ offset ═ 5, which require an offset.

The first IAB node calculates n after offset as {10,11,12,13}, and calculates a start symbol index of the first synchronization signal in a field as {8,12,16,20,32,36,40,44} +56 · n, where n is {0,1,2,3,10,11,12,13}, in combination with n without offset as {0,1,2, 3. Referring to fig. 18, fig. 18 is yet another example of determining a mapping position of a first synchronization signal within a field.

In another implementation, the configuration information display indicates a value of n that needs to be offset and an offset value corresponding to the value of n that needs to be offset. In other words, different values of n correspond to different offset values. Different offset values can be distinguished to represent, for example, n _ offset _1, n _ offset _2, n _ offset _3, etc.

For example, the configuration information indicates that n ═ {0,1,2,3}, n _ offset _1 ═ 3, and n ═ {5,6,7,8}, and n _ offset _2 ═ 10. And the first IAB node determines the values of n needing to be offset and the offset values corresponding to the values, and determines the initial symbol index of the first synchronous signal in the field. As shown in fig. 19. Fig. 19 is yet another example of determining the mapping position of the first synchronization signal within a field.

The above is a description of some ways for the first IAB node to determine the mapping position of the first synchronization signal in the time domain.

It should be noted that the SSB candidates (SSB candidates) in fig. 5 to 19 are also synchronization signals described in the present application.

320. The first IAB node transmits the first synchronization signal at some or all of the time domain locations in the first set of time domain locations and/or transmits the second synchronization signal at some or all of the time domain locations in the second set of time domain locations.

Wherein the first synchronization signal is used for measurement by other IAB nodes than the first IAB node. The second synchronization signal is for measurement by the terminal device. The procedure of measuring the second synchronization signal by the terminal device may be the same as the prior art and will not be described in detail here.

Optionally, the method 300 may further include step 330.

330. The second IAB node receives the first synchronization signal.

The reception of the first synchronization signal by the second IAB node may be used for measurement and maintenance of a backhaul link between the first IAB node and the second IAB node, or for discovery of the first IAB node.

It should be appreciated that the second IAB node also needs to determine the first set of time domain locations to receive the first synchronization signal before receiving the first synchronization signal.

The process for the second IAB node to determine the first set of time domain locations may be seen in the example and process for the first IAB node to determine the first set of time domain locations described in step 310. The example of the first IAB node determining the first set of time domain locations described in step 310 is applicable to the second IAB node and will not be described in detail herein.

It should be appreciated that the second synchronization signal transmitted by the first IAB node may be measured by the terminal device. And the terminal equipment receives the second synchronous signal and measures an access link between the first IAB node and the terminal equipment according to the second synchronous signal.

In addition, in the embodiments shown in fig. 6-8, the first IAB node receives configuration information from the donor base station, the configuration information being used to determine a first set of time domain locations to transmit the first synchronization signal. The second IAB node receives the configuration information and the complementary indication information from the donor base station, wherein the complementary indication information is used for indicating that the first time domain position set of the second IAB node for sending the first synchronization signal takes the complementary position of the first time domain position set indicated in the configuration information.

For example, the donor base station sends configuration information to the first IAB node, where the configuration information is used to instruct the first IAB node to send the first set of time domain locations of the first synchronization signal as shown in fig. 6. Meanwhile, the donor base station sends configuration information and complementary indication information to the second IAB node, where the complementary indication information is used to indicate that the second IAB node sends the second time domain position set of the first synchronization signal, and the time domain positions of the second IAB node are complementary to each other, as shown in fig. 7, the first time domain position set shown in fig. 6 and the first time domain position set shown in fig. 7.

And the second IAB node determines the first symbol set indicated by the configuration information according to the working frequency band and the subcarrier spacing of the communication system, determines the complementary position of the first symbol set indicated by the configuration information and sends a first synchronization signal at the complementary position. It is to be appreciated that the first synchronization signal transmitted by the second IAB node is used for mutual discovery and mutual measurement by other IAB nodes than the second IAB node.

That is, in the embodiments shown in fig. 6 to 8, the first IAB node receives configuration information of the donor base station, where the configuration information is used to indicate that a time domain position where the first IAB node transmits the first synchronization signal is any one of the first symbol sets in the embodiments in fig. 6 to 8. A neighboring node (e.g., a second IAB node) of the first IAB node receives the configuration information and complementary indication information from the donor base station, the complementary indication information indicating that a position at which the neighboring node transmits the first synchronization signal is a complementary position to a position indicated in the configuration information.

In this embodiment, a third IAB node in the communication system, except for the first IAB node and the second IAB node, may simultaneously measure the first synchronization signal transmitted by the first IAB node and the first synchronization signal transmitted by the second IAB node within a half frame, and thus, the discovery probability between the nodes may be increased.

Here, the third IAB node is an example of other IAB nodes in the communication system in addition to the first IAB node and the second IAB node. For example, the third IAB node is a neighbor node of the first IAB node and the second IAB node.

As an example, the first IAB node in method 300 may be IAB node 1 shown in fig. 2 and the second IAB node may be IAB node 2 shown in fig. 2.

In conjunction with the structure of the IAB node shown in fig. 3, in the above embodiment, the configuration information may be carried in the F1AP message sent by the CU of the donor base station. The MT of the IAB node receives the data packet containing the F1AP message from the donor base station over the air interface, and obtains the configuration information after parsing and processing the data packet by the DU of the IAB node. Alternatively, the DU of the IAB node may be configured by the host base station or a core network device (e.g., an operation and maintenance server), or may be reconfigured by the CU of the IAB node.

The method for transmitting the synchronization signal provided by the present application is described in detail above, and the apparatus for transmitting the synchronization signal provided by the present application is described below.

Referring to fig. 20, fig. 20 is a schematic block diagram of an apparatus 500 for transmitting a synchronization signal provided in the present application. As shown in fig. 20, the apparatus 500 includes a processing unit 510 and a transceiving unit 520.

A processing unit 510, configured to determine a first time domain position set for transmitting a first synchronization signal and a second time domain position set for transmitting a second synchronization signal, where when the first time domain position set and the second time domain position set are located in a same half frame, starting symbol indexes of the first time domain position set and the second time domain position set in the half frame are different;

a transceiver 520, configured to send the first synchronization signal at all or part of the time domain positions of the first set of time domain positions, and/or send the second synchronization signal at all or part of the time domain positions of the second set of time domain positions.

Alternatively, the apparatus 500 may be a chip or an integrated circuit.

The chip described in this embodiment of the present application may be a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on chip (SoC), a Central Processing Unit (CPU), a Network Processor (NP), a digital signal processing circuit (DSP), a Microcontroller (MCU), a Programmable Logic Device (PLD), or other integrated chips.

Alternatively, the processing unit 510 may be a processor. The transceiving unit 510 may be composed of a receiving unit and a transmitting unit. The transceiver unit 520 may be a transceiver, which may include a transmitter and a receiver, and has both receiving and transmitting functions. Optionally, the transceiving unit 510 may also be an input/output interface, or an input/output circuit.

In another possible approach, the transceiving unit 520 may be a communication interface. For example, an input/output interface, an input interface circuit, an output interface circuit, and the like.

It is understood that the apparatus 500 may correspond to the method 300 of transmitting synchronization signals and the first IAB node in the embodiments thereof provided herein. The apparatus 500 includes elements for implementing the method 300 and corresponding operations and/or processes performed by the first IAB node in its embodiments, respectively.

The transceiving unit 520 is also used to obtain configuration information, for example. The processing unit 510 is further configured to perform a calculation formula based on the second starting symbol index set of the second synchronization signal and the offset value of n, determine a first starting symbol index set of the first synchronization signal, and determine a first set of time domain positions based on the first starting symbol index set. For another example, the processing unit 510 is further configured to determine the first starting symbol index set according to the value of the required offset of n and offset values corresponding to the values of the required offset.

The present application further provides a network device 1000, which is described below with reference to fig. 21.

Referring to fig. 21, fig. 21 is a schematic structural diagram of a network device 1000 provided in the present application. The network device 1000 is configured to implement the function of the first IAB node in the method embodiment. As shown in fig. 21, the network device 1000 includes an antenna 1101, a radio frequency device 1102, and a baseband device 1103. An antenna 1101 is connected to the radio frequency device 1102. In the uplink direction, the rf device 1102 receives a signal transmitted by the terminal device through the antenna 1101, and transmits the signal transmitted by the terminal device to the baseband device 1103 for processing. In the downlink direction, the baseband device 1103 processes a signal to be sent to the terminal device and sends the signal to the radio frequency device 1102, and the radio frequency device 1102 processes the signal and sends the processed signal to the terminal device through the antenna 1101.

The baseband device 1103 may include one or more processing units 11031. In addition, the baseband apparatus 1103 may further include a storage unit 11032 and a communication interface 11033. The storage unit 11032 is used to store programs and data. The communication interface 11033 is used to exchange information with the radio frequency device 1102. The communication interface 11033 may be an input-output interface or an input-output circuit.

The network device 1000 in the above apparatus embodiment may completely correspond to the first IAB node in the method embodiment, and the network device 1000 includes corresponding units for executing corresponding steps executed by the first IAB node in the method embodiment.

For example, the baseband device 1103 determines a first set of time domain locations and a second set of time domain locations for transmitting the first synchronization signal, and transmits information containing the first set of time domain locations and the second set of time domain locations to the radio frequency device 1102. The radio frequency device 1102 transmits a first synchronization signal at some or all of the time domain locations of the first set of time domain locations, or transmits a second synchronization signal at some or all of the time domain locations of the second set of time domain locations. Alternatively, the radio frequency device 1102 may transmit the first synchronization signal at some or all of the time domain positions of the first set of time domain positions and may transmit the second synchronization signal at some or all of the time domain positions of the second set of time domain positions.

For another example, the rf device 1102 obtains configuration information from the donor base station through the antenna 1101, and sends the configuration information to the base station device. The baseband device 1103 determines an offset value of n according to the configuration information, determines a first starting symbol index set of the first synchronization signal according to a calculation formula of a second starting symbol set of the second synchronization signal and the offset value of n, and determines a first time domain position set according to the first starting symbol set. Optionally, when offset values of different values of n are different, the baseband device 1103 determines, according to the configuration information, a value of n that needs to be offset and offset values corresponding to the values of n that needs to be offset, and further determines a first starting symbol index set, and finally determines a first time domain position set.

For another example, the radio frequency device 1102 obtains the matching information and the complementary indication information from the host base station through the antenna 1101, and sends the configuration information and the complementary indication information to the baseband device 1103. The baseband device 1103 determines the first set of time domain locations according to the configuration information and the complementary indication information.

Furthermore, the present application provides a computer-readable storage medium having stored thereon computer instructions, which, when executed on a computer, cause the computer to perform the corresponding operations and/or procedures performed by the first IAB node in any of the method embodiments.

The present application further provides a computer program product, which includes computer program code to, when run on a computer, cause the computer to perform the corresponding operations and/or procedures of the method 300 of sending a synchronization signal of the embodiments of the present application or of any of the method embodiments performed by the first IAB node.

The application also provides a chip comprising a processor. The processor is configured to call and execute the computer program stored in the memory to perform corresponding operations and/or procedures performed by the first node in the method 300 for sending a synchronization signal according to the embodiment of the present application.

Optionally, the chip further comprises a memory, the memory being connected to the processor. The processor is used for reading and executing the computer program in the memory.

Further optionally, the chip further comprises a communication interface, and the processor is connected to the communication interface. The communication interface is used for receiving signals and/or data needing to be processed, and the processor acquires the signals and/or data from the communication interface and processes the signals and/or data.

Optionally, the communication interface may be an input-output interface, and may specifically include an input interface and an output interface. Alternatively, the communication interface may be an input-output circuit, and may specifically include an input circuit and an output circuit.

The memory and the storage referred to in the above embodiments may be physically separate units, or the memory and the processor may be integrated together.

The device 500 described in the above device embodiments may be a chip on the baseband device 1103, which includes at least one processing unit and interface circuits. Wherein the processing element is adapted to perform the steps of any of the methods performed by the above network device (i.e., the first IAB node), and the interface circuit is adapted to communicate with other apparatus.

In one implementation, the means for the network device to perform the steps of the above method may be implemented in the form of a processing unit scheduler. For example, processing unit 11031 calls a program stored in storage unit 11032 to execute the method executed by the first IAB node in the above method embodiment. The memory unit 11032 may be the processing unit 11031 on the same chip, i.e., an on-chip memory unit, or may be a memory element on a different chip from the processing unit 11031, i.e., an off-chip memory unit.

In the above embodiments, the processor may be a Central Processing Unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs according to the present disclosure. For example, the processor may be a digital signal processor device, a microprocessor device, an analog-to-digital converter, a digital-to-analog converter, or the like. The processor may distribute the functions of control and signal processing of the terminal device or the network device among these devices according to their respective functions. Further, the processor may have the functionality to operate one or more software programs, which may be stored in the memory. The functions of the processor can be realized by hardware, and can also be realized by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

The memory may be a read-only memory (ROM), other types of static storage devices that may store static information and instructions, a Random Access Memory (RAM), or other types of dynamic storage devices that may store information and instructions, an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, etc.

In the embodiment of the present application, "and/or" describes an association relationship of associated objects, and indicates that three relationships may exist, for example, a and/or B may indicate that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural.

Those of ordinary skill in the art will appreciate that the elements of the examples described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application.

In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.

The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: various media capable of storing program codes, such as a usb disk, a removable hard disk, a read-only memory (ROM), a Random Access Memory (RAM), a magnetic disk, or an optical disk.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

a first IAB node determines a first time domain position set for sending a first synchronous signal and a second time domain position set for sending a second synchronous signal, and when the first time domain position set and the second time domain position set are positioned in the same half frame, the starting symbol indexes of the first time domain position set and the second time domain position set in the half frame are different;

the first IAB node transmitting the first synchronization signal at all or part of the time domain positions of the first set of time domain positions and/or transmitting the second synchronization signal at all or part of the time domain positions of the second set of time domain positions;

the first IAB node acquires configuration information, wherein the configuration information is used for indicating an offset value of n, and the n is a parameter defined by a protocol and used for determining a starting symbol index of a second synchronous signal;

the first IAB node determines a first starting symbol index set of the first synchronization signal according to a calculation formula of a second starting symbol index set of a second synchronization signal and the offset value of the n;

determining the first set of time domain locations according to the first set of starting symbol indices.

2. The method of claim 1, wherein n has a plurality of values, wherein the configuration information is used to indicate a value to be shifted among the plurality of values and offset values corresponding to the values to be shifted,

the first IAB node determining a first starting symbol index set of the first synchronization signal according to a calculation formula of a second starting symbol index set of a second synchronization signal and the offset value of n, including:

and the first IAB node determines the first initial symbol index set according to the value of n needing to be offset and the offset value corresponding to the value of n needing to be offset.

3. A method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

when the working frequency band of the communication system is more than 6GHz and the subcarrier spacing SCS is 240KHz, the initial symbol index of the first synchronization signal in a half frame is as follows:

{8,12,16,20,32,36,40,44}+56·n,n＝10,11,12,13,15,16,17,18。

4. a method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

when the operating frequency band of the communication system is larger than 6GHz and the subcarrier spacing SCS is 240KHz, the first set of time domain positions is configured to be distributed dispersedly in a field, and the starting symbol index of the first synchronization signal in the field is:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,5,6,10,11,15, 16.

5. The method of claim 4, wherein the starting symbol index of the first synchronization signal in the half frame further comprises:

{8,12,16,20,32,36,40,44} +56 · n, n ═ 2,3,7,8,12,13,17, and 18.

6. A method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,2,3,10,11,12, 13.

7. The method of claim 6, wherein the starting symbol index of the first synchronization signal in the half frame further comprises:

{8,12,16,20,32,36,40,44} +56 · n, n ═ 5,6,7,8,15,16,17, and 18.

8. A method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

when the working frequency band of the communication system is less than 3GHz and the SCS is 15KHz, the initial symbol index of the first synchronization signal in a half frame is as follows:

{2,8}+14·n,n＝2,3。

9. a method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

{2,8}+14·n,n＝3,4。

10. a method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

when the working frequency band of the communication system is less than 6GHz and the SCS is 30KHz, the initial symbol position of the first synchronization signal in a half frame is as follows:

11. A method for transmitting synchronization signals, applied to a communication system comprising a host base station, one or more access and backhaul integrated IAB nodes and one or more terminal devices, the method comprising:

when the first IAB node transmits the first synchronization signal at all or part of the time domain positions of the first set of time domain positions and/or transmits the second synchronization signal at all or part of the time domain positions of the second set of time domain positions, and when the operating frequency band of the communication system is greater than or equal to 3GHz and less than or equal to 6GHz, the starting symbol index of the first synchronization signal in a half frame is:

12. The method of any one of claims 1-11, wherein the first synchronization signal and the second synchronization signal satisfy one or more of:

the subcarrier intervals of the first synchronization signal and the second synchronization signal are different; or,

the number of symbols occupied by the first synchronization signal and the second synchronization signal in a half frame is not equal.

13. An apparatus for transmitting a synchronization signal, comprising:

a processing unit, configured to determine a first time domain position set for transmitting a first synchronization signal and a second time domain position set for transmitting a second synchronization signal, where when the first time domain position set and the second time domain position set are located in a same half frame, starting symbol indexes of the first time domain position set and the second time domain position set in the half frame are different;

a transceiver unit, configured to send the first synchronization signal at all or part of the time domain positions of the first time domain position set, and/or send the second synchronization signal at all or part of the time domain positions of the second time domain position set;

the transceiver unit is further configured to acquire configuration information, where the configuration information is used to indicate an offset value of n, where n is a parameter defined by a protocol and used to determine a starting symbol index of a second synchronization signal;

the processing unit is further configured to determine a first starting symbol index set of the first synchronization signal according to a calculation formula of a second starting symbol index set of a second synchronization signal and the offset value of n;

the processing unit is further configured to determine the first set of time domain positions according to the first set of starting symbol indices.

14. An apparatus for transmitting a synchronization signal, comprising:

when the working frequency band of the communication system is larger than 6GHz and the subcarrier spacing SCS is 240KHz, the initial symbol index of the first synchronization signal in a half frame is as follows:

{8,12,16,20,32,36,40,44}+56·n,n＝10,11,12,13,15,16,17,18。

15. an apparatus for transmitting a synchronization signal, comprising:

when the working frequency band of the communication system is larger than 6GHz and the subcarrier spacing SCS is 240KHz, the first time domain position set is configured to be distributed dispersedly in a half frame, and the starting symbol index of the first synchronization signal in the half frame is:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,5,6,10,11,15, 16.

16. The apparatus of claim 15, wherein the starting symbol index of the first synchronization signal in the half frame further comprises:

{8,12,16,20,32,36,40,44} +56 · n, n ═ 2,3,7,8,12,13,17, and 18.

17. An apparatus for transmitting a synchronization signal, comprising:

{8,12,16,20,32,36,40,44} +56 · n, where n ═ 0,1,2,3,10,11,12, 13.

18. The apparatus of claim 17, wherein the starting symbol index of the first synchronization signal in the half frame further comprises:

{8,12,16,20,32,36,40,44} +56 · n, n ═ 5,6,7,8,15,16,17, and 18.

19. A computer-readable storage medium having stored thereon computer instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-12.

20. A chip comprising a memory for storing a computer program and a processor for reading and executing the computer program stored in the memory to perform the method of any one of claims 1-12.