CN114642044A - Synchronization signal block indication method and communication device - Google Patents
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Abstract
The embodiment of the application provides a synchronization signal block indicating method and a communication device, which can be applied to a scene of the Internet of things and are used for acquiring a synchronization signal block with low power consumption. Wherein, the method can comprise the following steps: the first terminal equipment sends indication information to the second terminal equipment, wherein the indication information is used for indicating the resource position of the synchronization signal block; the second terminal equipment receives the synchronous signal block from the network equipment according to the resource position of the synchronous signal block under the condition of receiving the indication information; therefore, the second terminal device does not need to directly and blindly detect the synchronous signal block broadcast by the network device, and receives the synchronous signal block from the network device with the assistance of the first terminal device, so that the searching times can be reduced, and the power consumption overhead can be reduced.
Description
The embodiment of the application relates to the technical field of communication, and in particular relates to a synchronization signal block indication method and a communication device.
Fifth generation (5)thgeneration, 5G) mobile communication technology (or called New Radio (NR)) can support three types of communication, namely enhanced mobile broadband (eMBB) communication, ultra-reliable low-latency communication (URLLC) and massive machine type communication (mtc).
Wherein, mtc may also be referred to as large-scale internet of things. The mtc can be applied in a home, industrial, public place, and other scenarios, and the scenarios may include a large number of terminal devices in various forms. For example, in an industrial automation scenario, a large number of monitoring devices (cameras), machines (machines), sensors (sensors), etc. may be included in a plant; in daily work and life scenes, the mobile phone, the wearable device, the intelligent household appliance, the vehicle-mounted terminal and the like can be included.
Disclosure of Invention
The embodiment of the application provides a synchronization signal block indicating method and a communication device.
A first aspect of an embodiment of the present application provides a synchronization signal block indication method, including:
receiving indication information from a first terminal device, wherein the indication information is used for indicating the resource position of a synchronization signal block;
the synchronization signal block is received from the network device according to the resource location of the synchronization signal block.
Optionally, the first terminal device is a power consumption insensitive terminal device, and the method for implementing the first aspect may be a power consumption sensitive second terminal device, or may be a component (e.g. a processor, a chip, or a system of chips, etc.) of the second terminal device.
According to the first aspect of the embodiment of the application, the resource position of the synchronization signal block is obtained by receiving the indication information from the first terminal device, and then the synchronization signal block is received from the network device according to the resource position of the synchronization signal block, the synchronization signal block broadcasted by the network device does not need to be directly detected in a blind manner, the number of times for searching the synchronization signal block by the second terminal device can be reduced, and then the synchronization signal block can be obtained with low power consumption, and the power consumption speed of the second terminal device can be reduced.
In a possible implementation manner, the indication information is carried by a sidelink synchronization signal. The resource position of the synchronization signal block is indicated through the sidelink synchronization signal, so that the second terminal device can acquire the resource position of the synchronization signal block through the sidelink synchronization signal, the second terminal device can receive the synchronization signal block from the network device, and signaling overhead can be saved.
In a possible implementation manner, the indication information is carried by a sidelink synchronization signal, and may include: the pattern of the sidelink synchronization signal is used to indicate the resource location of the synchronization signal block. Optionally, the pattern of the sidelink synchronization signal is used to indicate a frequency domain position offset, and/or a time domain position offset of the sidelink synchronization signal relative to the synchronization signal block. Optionally, the pattern of the sidelink synchronization signal is used to indicate a frequency domain position offset, and/or a time domain position offset of the reference position relative to the synchronization signal block. Optionally, the reference position is a specific position in the sidelink synchronization signal. Optionally, the pattern of the sidelink synchronization signal comprises a sequence value of the sidelink synchronization signal.
In this way, the resource position of the synchronization signal block is implicitly indicated by the pattern of the sidelink synchronization signal, so that the resource position of the synchronization signal block can be known by the second terminal device under the condition of knowing the pattern of the sidelink synchronization signal, so that the second terminal device receives the synchronization signal block from the network device, and signaling overhead can be saved.
In one possible implementation, the transmission period of the sidelink synchronization signal is smaller than the transmission period of the set of synchronization signal blocks, which includes one or more synchronization signal blocks. For example, the transmission period of the synchronization signal block set is 40ms, and the transmission period of the sidelink synchronization signal is 20 ms. That is, the density of the sidelink synchronization signal in the time domain is increased to reduce the number of times that the second terminal device searches for the sidelink synchronization signal, thereby reducing power consumption. Furthermore, the density of the side link synchronization signals in the frequency domain can be increased, or the density of the side link synchronization signals in the time domain and the frequency domain can be increased.
In a possible implementation manner, the indication information is carried through a sidelink control channel. I.e. the indication information is carried in the sidelink control information. And indicating the resource position of the synchronous signal block by carrying the indicating information through the side link control channel so that the second terminal equipment can know the resource position of the synchronous signal block.
The indication information may include time domain indication information, where the time domain indication information is used to indicate a time domain resource location of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the sidelink control channel is indicated; or, the time domain resource position of the synchronization signal block relative to the sidelink data channel, which is the data channel associated with the sidelink control channel.
The indication information may include frequency domain indication information, where the frequency domain indication information is used to indicate a frequency domain resource location of the synchronization signal block; or, the frequency domain resource position of the synchronization signal block relative to the side link data channel is indicated; or, to indicate the frequency domain resource location of the synchronization signal block relative to a sidelink control channel, the sidelink data channel being a data channel associated with the sidelink control channel.
The indication information may include the time domain indication information and the frequency domain indication information.
In a possible implementation, the indication information is carried through a sidelink data channel. I.e. the indication information is carried in the sidelink data information. And indicating the resource position of the synchronous signal block by carrying the indicating information through the side link data channel so that the second terminal equipment can know the resource position of the synchronous signal block.
The indication information comprises time domain indication information, and the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the side link data channel is indicated; or, to indicate the time domain resource location of the synchronization signal block relative to a sidelink control channel, which is the control channel associated with the sidelink data channel.
The indication information comprises frequency domain indication information, and the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource position of the synchronization signal block relative to the side link data channel is indicated; or, for indicating the frequency domain resource location of the synchronization signal block relative to the sidelink control channel, which is the control channel associated with the sidelink data channel.
The indication information may include the time domain indication information and the frequency domain indication information.
In one possible implementation, the indication information is carried through a sidelink broadcast channel. I.e. the indication information is carried in the sidelink broadcast information. And indicating the resource position of the synchronous signal block by carrying the indication information through a side link broadcast channel so that the second terminal equipment can know the resource position of the synchronous signal block.
The indication information comprises time domain indication information, and the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the sidelink synchronization signal block is indicated; or, the time domain resource position of the synchronization signal block relative to the sidelink broadcast channel is indicated.
The indication information comprises frequency domain indication information, and the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource position of the synchronization signal block relative to the sidelink synchronization signal block is indicated; or, the frequency domain resource position of the synchronization signal block relative to the sidelink broadcast channel is indicated.
The indication information may include the time domain indication information and the frequency domain indication information.
The sidelink synchronization signal block may include a sidelink synchronization signal and a sidelink broadcast channel, and the sidelink synchronization signal may include a sidelink primary synchronization signal and a sidelink secondary synchronization signal.
The indication information is carried by a sidelink control channel, a sidelink data channel, or a sidelink broadcast channel, and may be understood as an explicit indication manner.
In a possible implementation manner, the indication information is further used for indicating a transmission period of the synchronization signal block set. By the mode, the second terminal equipment determines the resource position of the synchronous signal block in the transmission period of the subsequent synchronous signal block set according to the transmission period of the synchronous signal block set and the resource position of the synchronous signal block, and accumulates the synchronous signal blocks, so that the receiving intensity of the synchronous signal block can be enhanced, and coverage is enhanced. For example, the indication information is used to indicate the resource location of the synchronization signal block 3, and the synchronization signal block 3 is the third synchronization signal block in the transmission period, then the second terminal device may determine the resource location of the synchronization signal block 3 in the subsequent transmission period according to the resource location of the synchronization signal block 3 and the transmission period. Or, the transmission period of the synchronization signal and the resource location of the synchronization signal block are indicated by different indication information.
In a possible implementation manner, the indication information is further used to indicate a cell identifier, where the cell identifier is an identifier of a cell to which the first terminal device or the second terminal device belongs, and the first terminal device and the second terminal device belong to the same cell. Or, the resource positions of the cell identifier and the synchronization signal block are indicated by different indication information.
In a possible implementation manner, the resource location of the synchronization signal block indicated by the indication information is the resource location of the synchronization signal block searched by the first terminal device, which may be referred to as the resource location of the first synchronization signal block, the second terminal device may determine the resource location of the second synchronization signal block based on the transmission period of the set of synchronization signal blocks and the resource location of the first synchronization signal block, the resource location of the second synchronization signal block may be a synchronization signal block in the same order as the first synchronization signal block in the transmission period of the subsequent set of synchronization signal blocks, for example, the first synchronization signal block is the third synchronization signal block in transmission cycle 1 of the synchronization signal block set, the second synchronization signal block is the third synchronization signal block in transmission cycle 2 of the synchronization signal block set, and transmission cycle 2 of the synchronization signal block set is the next transmission cycle of transmission cycle 1 of the synchronization signal block set. The second terminal device may receive the first synchronization signal block or the second synchronization signal block from the network device.
Or, the resource location of the synchronization signal indicated by the indication information is the resource location of the second synchronization signal block determined by the first terminal device, and the second terminal device may receive the second synchronization signal block from the network device.
A second aspect of the embodiments of the present application provides a communication apparatus, where the communication apparatus may be a second terminal device, may also be an apparatus in the second terminal device, or may be an apparatus capable of being used in cooperation with the second terminal device. In one design, the apparatus may include a module corresponding to one or more of the methods/operations/steps/actions described in the first aspect, where the module may be implemented by hardware circuit, software, or a combination of hardware circuit and software. In one design, the apparatus may include a processing module and a communication module. In an exemplary manner, the first and second electrodes are,
the processing module is used for receiving indication information from the first terminal equipment by utilizing the communication module, and the indication information is used for indicating the resource position of the synchronization signal block; and receiving the synchronous signal block from the network equipment by utilizing the communication module according to the resource position of the synchronous signal.
For the introduction of the indication information and the like, reference may be made to the corresponding introduction of the first aspect, which is not described herein again.
A third aspect of the embodiments of the present application provides a communication apparatus, which includes a processor and is configured to implement the method described in the first aspect. The apparatus may also include a memory for storing instructions and/or data. The memory is coupled to the processor, and the processor, when executing the instructions stored in the memory, may implement the method described in the first aspect above. The apparatus may further include a communication interface for the apparatus to communicate with other devices, such as a transceiver, a circuit, a bus, a module, a pin, or other type of communication interface, such as a network device, a first terminal device, etc. In one possible design, the apparatus includes:
a memory for storing program instructions;
a processor, configured to receive, by a transceiver, indication information from a first terminal device, where the indication information indicates a resource location of a synchronization signal block; and receiving the synchronous signal block from a network device by utilizing the transceiver according to the resource position of the synchronous signal.
For the introduction of the indication information and the like, reference may be made to the corresponding introduction of the first aspect, which is not described herein again.
A fourth aspect of embodiments of the present application provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method provided in the first aspect.
A fifth aspect of the embodiments of the present application provides a chip system, where the chip system includes a processor and may further include a memory, and is configured to implement the method provided in the first aspect. The chip system may be formed by a chip, and may also include a chip and other discrete devices.
A sixth aspect of the present embodiment provides a synchronization signal block indication method, including:
and sending indication information to the second terminal equipment, wherein the indication information is used for indicating the resource position of the synchronization signal block, and the synchronization signal block is used for communicating with the network equipment.
Optionally, the second terminal device is a power consumption sensitive terminal device, and the method according to the sixth aspect may be implemented in the first terminal device, which is not power consumption sensitive, or may be a component (e.g. a processor, a chip, or a system of chips) of the first terminal device.
In one possible implementation, the first terminal device determines a resource location of a first synchronization signal block, where the first synchronization signal block is a synchronization signal block searched by the first terminal device. Or the first terminal device determines the resource location of the second synchronization signal block, and the second synchronization signal block and the first synchronization signal block are synchronization signal blocks in the same sequence or in the same order in the transmission period of different synchronization signal block sets. For example, the first synchronization signal block is the third synchronization signal block in transmission cycle 1 of the synchronization signal block set, the second synchronization signal block is the third synchronization signal block in transmission cycle 2 of the synchronization signal block set, and transmission cycle 2 of the synchronization signal block set is the next transmission cycle of transmission cycle 1 of the synchronization signal block set.
For the introduction of the indication information and the like, reference may be made to the corresponding introduction of the first aspect, which is not described herein again.
A seventh aspect of the embodiments of the present application provides a communication apparatus, where the communication apparatus may be a first terminal device, may also be an apparatus in the first terminal device, or may be an apparatus that can be used in cooperation with the first terminal device. In one design, the apparatus may include a module corresponding to one or more of the methods/operations/steps/actions described in the sixth aspect, where the module may be implemented by hardware circuit, software, or a combination of hardware circuit and software. In one design, the apparatus may include a processing module and a communication module. In an exemplary manner, the first and second electrodes are,
and the processing module is used for sending indication information to the second terminal equipment by utilizing the communication module, wherein the indication information is used for indicating the resource position of the synchronous signal block, and the synchronous signal block is used for communicating with the network equipment.
For the introduction of the indication information and the like, reference may be made to the corresponding introduction of the first aspect, which is not described herein again.
An eighth aspect of the present embodiment provides a communication apparatus, which includes a processor and is configured to implement the method described in the sixth aspect. The apparatus may also include a memory for storing instructions and/or data. The memory is coupled to the processor, and the processor, when executing the instructions stored in the memory, may implement the method described in the sixth aspect above. The apparatus may also include a communication interface for the apparatus to communicate with other devices, such as a transceiver, circuit, bus, module, pin, or other type of communication interface, such as a network device, a second terminal device, etc. In one possible design, the apparatus includes:
a memory for storing program instructions;
and the processor is used for sending indication information to the second terminal equipment by using the transceiver, wherein the indication information is used for indicating the resource position of the synchronization signal block, and the synchronization signal block is used for communicating with the network equipment.
In a possible implementation manner, the processor is specifically configured to determine a resource location of a first synchronization signal block, where the first synchronization signal block is a synchronization signal block searched by the first terminal device. Or, the processor is specifically configured to determine a resource location of a second synchronization signal block, where the second synchronization signal block and the first synchronization signal block are synchronization signal blocks in the same order or in the same sequence in a transmission cycle of different synchronization signal block sets.
For the introduction of the indication information and the like, reference may be made to the corresponding introduction of the first aspect, which is not described herein again.
A ninth aspect of embodiments of the present application provides a computer-readable storage medium, which includes instructions that, when executed on a computer, cause the computer to perform the method provided by the sixth aspect.
A tenth aspect of the present embodiment provides a chip system, where the chip system includes a processor and may further include a memory, and is configured to implement the method provided in the sixth aspect. The chip system may be formed by a chip, and may also include a chip and other discrete devices.
An eleventh aspect of an embodiment of the present application provides a communication system, where the communication system includes a communication apparatus (e.g., a first terminal device) that implements a function of a first terminal device and a communication apparatus (e.g., a second terminal device) that implements a function of a second terminal device, and optionally further includes a network device.
A twelfth aspect of embodiments of the present application provides a computer program product comprising instructions that, when run on a computer, cause the computer to perform the method provided in the first or sixth aspect.
Fig. 1 is a diagram illustrating an example of a time domain position of a synchronization signal block according to an embodiment of the present application;
fig. 2 is a schematic diagram of a network architecture according to an embodiment of the present application;
fig. 3 is a flowchart illustrating a method for indicating a sync signal block according to an embodiment of the present disclosure;
FIG. 4 is an exemplary diagram of a CUE search SSB provided by an embodiment of the present application;
FIG. 5 is an exemplary diagram of a TUE acquiring SSB provided by an embodiment of the present application;
fig. 6 is a flowchart illustrating another method for indicating a sync signal block according to an embodiment of the present application;
fig. 7 is an exemplary diagram of indicating SSB via a sidelink control channel according to an embodiment of the present application;
FIG. 8 is an exemplary diagram of indicating SSBs via a sidelink data channel as provided by an embodiment of the present application;
fig. 9 is a diagram illustrating an example of indicating SSB via a sidelink broadcast channel according to an embodiment of the present application;
fig. 10 is a schematic logical structure diagram of a communication apparatus according to an embodiment of the present application;
fig. 11 is a simplified block diagram of another embodiment of a communication device according to the present disclosure.
In order to better understand the technical solutions provided by the embodiments of the present application, first, the technologies or names related to the embodiments of the present application are introduced.
(1) Sidelink (sidelink, SL)
The sidelink may also be referred to as a side link, a sidelink, or the like. The sidelink is a link for device-to-device (D2D) direct communication. For example, a side link is a link between one terminal device and another terminal device for the one terminal device and the another terminal device to directly transmit information that does not require a network device to forward between the one terminal device and the another terminal device.
In embodiments of the present application, the transmission may include sending and/or receiving. For example, one terminal device and another terminal device transmit information including: the one terminal device transmitting the information to the another terminal device, the another terminal device receiving the information from the one terminal device; or, the one terminal device receives the information from the another terminal device, and the another terminal device transmits the information to the one terminal device. For example, the network device and the terminal device transmit information, including: the network equipment sends downlink information to the terminal equipment, and the terminal equipment receives the downlink information from the network equipment; or, the terminal device sends the uplink information to the network device, and the network device receives the uplink information from the terminal device.
The sidelink physical layer channel mainly includes a sidelink data channel (e.g., a physical sidelink shared channel (PSCCH), and/or a Physical Sidelink Discovery Channel (PSDCH)), a Physical Sidelink Control Channel (PSCCH), a sidelink synchronization signal (SL-SS), and/or a Physical Sidelink Broadcast Channel (PSBCH). The pschs can also be described as sidelink shared channels, the PSDCHs can also be described as sidelink discovery channels, the PSCCHs can also be described as sidelink control channels, and the PSBCH can also be described as sidelink broadcast channels.
The PSCCH may carry or be used to indicate scheduling information of the psch, such as one or more of the following transmission parameters for indicating the psch: resource location (e.g., time domain resource and/or frequency domain resource location), Transport Block Size (TBS), Modulation and Coding Scheme (MCS), modulation scheme, coding rate, and Redundancy Version (RV). The psch may carry data information, e.g., data information transmitted from one terminal device to another terminal device, which may include higher layer control signaling and/or traffic data.
The basis of communication between the terminal equipment and the terminal equipment comprises the realization of synchronization between the terminal equipment, and the terminal equipment can realize the synchronization between the terminal equipment by using SL-SS. The SL-SS may include a sidelink primary synchronization signal (SL-PSS) and a sidelink secondary synchronization signal (SL-SSs), which may occur in pairs, and may be ZC (Zadoff-Chu) sequences, transmitted on a specified time-frequency resource (similar to that of a Synchronization Signal Block (SSB) described below).
(2) Downlink synchronization between a terminal device and a network device
One network device may manage one or more cells. The terminal device may randomly access the network device in a cell managed by the network device to communicate with the network device in the cell. Before the terminal device randomly accesses the network device or communicates with the network device, downlink synchronization with the network device needs to be achieved, so that cell system information can be obtained, and the system information can include information such as random access configuration of a cell.
In one possible implementation, the network device periodically broadcasts a synchronization signal block SSB to the terminal device, where the SSB includes synchronization signals (e.g., Primary Synchronization Signal (PSS) and Secondary Synchronization Signal (SSS)) and a Physical Broadcast Channel (PBCH). The information carried on the PBCH may be referred to as a main system information block (MIB).
In this embodiment of the present application, the PSS, the SSS, and the PBCH may be sent in combination in an SSB form or in a separate form, which is not limited in this embodiment of the present application. The relative resource locations of PSS, SSS, and PBCH may be predefined or fixed, or one may obtain the resource location of the other, e.g., SSS and/or PBCH may be obtained from PSS, PSS and/or PBCH may be obtained from SSS, and PSS and/or SSS may be obtained from PBCH.
The terminal device, e.g., the first terminal device and/or the second terminal device, may communicate with the network device using the SSB. Illustratively, the terminal device receives the SSB in the time-frequency resource (e.g., the first terminal device searches for the SSB in the time-frequency resource, e.g., the second terminal device receives the SSB in the time-frequency resource according to the indication of the first terminal device), and uses the synchronization signal in the SSB to achieve downlink synchronization with the network device. Further, the terminal device may further obtain other system information according to the indication of the MIB in the SSB. According to the system information, the terminal device may access the network device in the cell, and then the terminal device may transmit data to the network device (e.g., transmit uplink data through a Physical Uplink Shared Channel (PUSCH)) or receive data from the network device (e.g., receive downlink data through a Physical Downlink Shared Channel (PDSCH)).
The terminal device, for example, the first terminal device, may execute the SSB search process after being powered on or in the case of losing the downlink synchronization signal. Searching for SSBs, which may also be described as blinding SSBs or scanning SSBs, etc.
(3) Process for searching SSB by terminal equipment
The terminal device scans for SSBs in time and frequency domain locations where SSBs may occur, which may include time and frequency domain scanning.
For frequency domain scanning, in one possible implementation, a synchronization grid (synchronization raster) of the SSB in the frequency domain is set or specified for determining frequency points where the center frequency of the SSB may occur, as shown in table 1 below. Taking table 1 as an example, the central frequency of SSB may appear at the frequency points N × 1200kHz + M × 50kHz in the 0-3000 MHz band. If the terminal device has no previously stored cell (cell) information (for example, when the terminal device is just started), different N and M values are tried one by one, and the synchronization signal is detected on the frequency points determined by the different N and M values.
TABLE 1
In table 1, GSCN and the range of GSCN are used to define the values of N and M. Table 1 is only used for example, and actually, the formula in table 1 may be other polynomials, and the number of rows in table 1 may also be other numbers of rows, and the like, and the embodiment of the present application is not limited.
For time domain scanningIt is noted that, in a communication system supporting multiple subcarrier intervals, the time domain position of the SSB may be configured independently for each subcarrier interval, and the time domain positions of the SSBs of different subcarrier intervals may be the same or different, which is not limited in this embodiment of the present application. In one possible implementation, multiple SSBs are included in one SSB set (burst), with one SSB burst being 5 milliseconds (ms) in duration. In the implementation process, the network device may send the SSB in a spatial beam scanning manner, and the terminal device finishes scanning an SSB burst within 5 ms. A radio frame is 10ms long, and includes a first half frame and a second half frame, and the radio frame may also be referred to as a frame for short. The network device may support sending an SSB burst in the first 5ms (first half frame) or sending an SSB burst in the last 5ms (second half frame). Optionally, whether the network device transmits a reference signal of which SSB burst can be transmitted by PBCH in the first 5ms or the last 5ms
The indication is made, for example, by a demodulation reference signal (DMRS) of the PBCH. In the embodiments of the present application, the reference signal may also be referred to as a pilot. The duration of an SSB burst may also be other values, and the embodiment of the present application is not limited.
The number of SSBs included in one SSB burst may be referred to as SSB burst size (size). Illustratively, for the sub-3GHz band, the SSB burst size is at most 4, i.e., at most 4 SSBs are transmitted in 5 ms; for sub-3 GHz-sub-6 GHz frequency bands, the maximum SSB burst size is 8, namely, the maximum SSB is transmitted within 5ms by 8 SSBs; for frequency bands larger than 6GHz, the SSB burst is maximum 64, i.e. maximum 64 SSBs are transmitted in 5 ms. The network device may configure the transmission period of the SSB burst for the terminal device through a parameter (for example, SSB-periodicityserving cell) in a System Information Block (SIB) 1, which may be one of {5ms,10ms,20ms,40ms,80ms,160ms }. For example, the transmission period of the SSB bursts is 20ms, which means that one SSB burst is transmitted every 20 ms. In the embodiment of the application, the SSB burst, the SSB set and the synchronous signal block set are the same concept and can be interchanged; the transmission period of the SSB burst and the transmission period of the synchronization signal block set are the same concept and can be interchanged.
Under the condition that the terminal device does not obtain the transmission period of the SSB burst from the network device, for example, when the terminal device is just started, the terminal device may search for the SSB according to the default transmission period of the SSB burst, for example, the default transmission period of the SSB burst is 40ms, and the time duration of the SSB burst is 5ms, and then the terminal device may search for at most 8 SSB bursts on one frequency point, and search for the SSB on another frequency point if the SSB is not searched.
For example, see an exemplary graph of the time domain location of the SSB shown in fig. 1. In fig. 1, the transmission period of the SSB burst is 20ms, the SSB burst size is 8, the SSB burst is transmitted in the first half frame (5ms) of one frame in one transmission period, and 8 SSBs are transmitted every 5 ms. When the network device sends an SSB burst, 8 SSBs in the SSB burst may be sent using 8 different beam directions, respectively, where each SSB corresponds to one beam direction. Illustratively, in a case where downlink synchronization with the network device is not obtained or lost, the terminal device does not know a time domain location where the SSB is located, and therefore needs to blindly detect a synchronization signal in the SSB on each time domain symbol, and based on the example shown in fig. 1, the terminal device may need to retrieve the synchronization signal on each time domain symbol within 20ms until the PSS and the SSS are obtained.
(4) First terminal device and second terminal device
In this embodiment, the first terminal device may also be described as a cooperative user equipment (ue), a cooperative terminal device, or the like. The CUE may blindly detect the synchronization signal block SSB directly from the network device, may indicate the resource location of the SSB to other UEs (e.g., TUE described below), i.e., may assist the other UEs in receiving the SSB from the network device. The CUE may receive downlink signals from the network device, such as PDSCH and/or downlink reference signals; the CUE may transmit an uplink signal, such as a PUSCH and/or uplink reference signal, or other uplink signal, to the network device.
The second terminal device may also be described as a Target User Equipment (TUE) or a target terminal device, etc. The TUE may receive SSBs from the network device via other UEs (e.g., CUEs). The TUE may receive the SSB from the network device according to an indication of another UE (e.g., the CUE described above), and after receiving the SSB from the network device, the TUE may communicate directly with the network device according to the SSB. For example, the TUE obtains the resource location of the SSB according to the indication of the CUE, receives the SSB from the network device according to the resource location of the SSB, and implements downlink synchronization with the network device by using a synchronization signal in the SSB. The TUE may obtain other system information from the MIB in the SSB. According to the system information, the TUE may access the network device in the cell, and may transmit other uplink signals such as PUSCH and/or uplink reference signals to the network device, or may transmit other downlink signals such as PDSCH and/or downlink reference signals from the network device.
Optionally, in this embodiment of the present application, the first terminal device is a terminal device insensitive to power consumption, and may be, for example, a machine with a stable power supply, a monitoring device, or a mobile phone with a large battery capacity; the second terminal device is a power consumption sensitive terminal device, and may be, for example, a sensor, a wearable device, or an NR light User Equipment (UE).
Optionally, in this embodiment of the present application, the first terminal devices are all terminal devices insensitive to power consumption, or are all terminal devices sensitive to power consumption.
In the embodiment of the present application, power consumption refers to power efficiency, and may also be described as energy consumption, electricity consumption, or battery consumption.
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application. In the description of the embodiments of the present application, a "/" indicates a relationship in which the objects related to each other are "or" unless otherwise specified, for example, a/B may indicate a or B. Also, in the description of the present application, "a plurality" means two or more than two unless otherwise specified. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of the singular or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, a and b, a and c, b and c, or a and b and c, wherein a, b and c can be single or multiple. In addition, in order to facilitate clear description of technical solutions of the embodiments of the present application, in the embodiments of the present application, terms such as "first" and "second" are used to distinguish technical features having substantially the same or similar functions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.
The network device according to the embodiment of the present application may also be referred to as a network side device, and may include a Base Station (BS), which may be a device deployed in a radio access network and capable of performing wireless communication with a terminal device. The base station may have various forms, such as a macro base station, a micro base station, a relay station, an access point, and the like. For example, the network device related to the embodiment of the present application may be a base station in 5G or a base station in Long Term Evolution (LTE), where the base station in 5G may also be referred to as a Transmission Reception Point (TRP) or a next generation base station Node (gNB). In the embodiment of the present application, the apparatus for implementing the function of the network device may be a network device; it may also be a device, such as a chip system, capable of supporting the network device to implement the function, and the device may be installed in the network device or used in cooperation with the network device. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices. In the technical solution provided in the embodiment of the present application, a device for implementing a function of a network device is taken as an example of a network device, and the technical solution provided in the embodiment of the present application is described.
The first terminal device and the second terminal device related to the embodiment of the application can be devices with wireless transceiving functions, can be deployed on land, and comprise indoor or outdoor, handheld or vehicle-mounted devices; can also be deployed on the water surface (such as a ship and the like); and may also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device may be a UE, wherein the UE includes a handheld device, a vehicle-mounted device, a wearable device, or a computing device having wireless communication functionality. Illustratively, the UE may be a mobile phone (mobile phone), a tablet computer, or a computer with wireless transceiving function. The terminal device may also be a Virtual Reality (VR) terminal device, an Augmented Reality (AR) terminal device, a smart car (smart vehicle) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city (smart city), a wireless terminal in a smart home (smart home), and so on. The UE may also be a sensor in the industrial field, etc. In the embodiment of the present application, the apparatus for implementing the function of the terminal device may be a terminal device; it may also be a device, such as a chip system, capable of supporting the terminal device to realize the function, and the device may be installed in the terminal device or used in cooperation with the terminal device. The terminal device may be classified into a TUE and a CUE according to whether the terminal device receives the SSB from the network device according to an instruction of other terminal devices or whether the terminal device receives the SSB from the network device only through blind detection. In the technical solution provided in the embodiment of the present application, the first terminal device takes a CUE as an example, and the second terminal device takes a CUE as an example, to describe the technical solution provided in the embodiment of the present application.
In a possible implementation, when the terminal device blindly detects the SSB from the network device, during the SSB search process, a possible sequence of synchronization signals needs to be tried on each possible frequency point and each symbol. For example, there are 3 possible sequences of PSS, and assuming that there are 10 possible frequency points and 10 possible symbol positions, the terminal device needs to try at least once, and needs to try 10 × 3 × 300 times at most to search for the PSS sent by the network device. It can be seen that the process of the terminal device searching for the SSB is a continuous reception, multiple-attempt process, and the power consumption is high. For terminal equipment sensitive to power consumption, if SSB is searched according to the method, the power consumption speed of the terminal equipment is accelerated.
In view of this, embodiments of the present application provide a synchronization signal block indication method and a communication apparatus, so that a terminal device sensitive to power consumption can obtain a synchronization signal block with low power consumption, thereby reducing power consumption of the terminal device. Optionally, the method provided by the embodiment of the present application may also be applied to a terminal device insensitive to power consumption, so as to improve user experience.
In the embodiment of the application, a first terminal device sends indication information to a second terminal device, where the indication information is used to indicate a resource location of a synchronization signal block SSB sent by a network device; the second terminal device receives the synchronization signal block from the network device according to the resource location of the synchronization signal block. The first terminal device and/or the second terminal device may communicate with the network device in accordance with the received SSB. When the second terminal device communicates with the network device according to the SSB, for example, when transmitting the PDSCH and/or PUSCH, the PDSCH and/or PUSCH may be transmitted directly with the network device without the assistance of the first terminal device, that is, without the first terminal device forwarding or indicating the PDSCH and/or PUSCH.
In this embodiment, there are many possible implementations of the terminal device to determine the type of the terminal device (the terminal device is a first terminal device or a second terminal device). In one possible approach, the type of the terminal device may be preconfigured in a Subscriber Identity Module (SIM) card, for example, the terminal device is configured as the first terminal device or the second terminal device in the SIM card. In one possible approach, different number segments are configured for the terminal device, for example, the number segments used by the first terminal device and the second terminal device are different, and the terminal device determines the type of the terminal device according to the number segments. In one possible approach, the terminal device may determine itself as the first terminal device or the second terminal device.
Please refer to fig. 2, which is a schematic diagram of a network architecture according to an embodiment of the present application. The network architecture includes a network device 201, a first terminal device 202 and a second terminal device 203. It should be noted that the form and number of the devices shown in fig. 2 are for example and are not to be construed as limiting the embodiments of the present application.
Fig. 2 illustrates an SSB burst size as 4, where the network device 201 may send the SSB burst in the first half frame or the second half frame, and 4 SSBs in an SSB burst may be respectively denoted as SSB-1, SSB-2, SSB-3, and SSB-4. The first terminal device 202 blindly detects the SSB from the network device 201; the second terminal device 203 obtains the resource location of the SSB from the first terminal device 202, and receives the SSB from the network device 201 according to the resource location of the SSB.
The network device 201 periodically broadcasts SSB bursts and the first terminal device 202 searches for SSBs.
In one implementation, the first terminal device 202 determines the resource location of a certain SSB in a certain transmission cycle if the SSB is searched. Assuming that the first terminal device 202 searches for SSB-3 in transmission cycle 1, the resource location of SSB-3 in transmission cycle 1 is determined. Thereafter, the first terminal device 202 may send indication information to the second terminal device 203, the indication information indicating the resource location of SSB-3 in transmission cycle 1. The second terminal apparatus 203, upon receiving the indication information, may receive the SSB in transmission cycle 1 or the SSB in transmission cycle n from the network apparatus 201 according to the indication information. Where n is a positive integer and represents the next transmission period of transmission period 1, for example, n is 2 and represents the next transmission period of transmission period 1; n is 3, which indicates the next two transmission periods of transmission period 1. The second terminal device 203 may also receive SSBs in multiple transmission cycles from the network device 201, for example, SSBs in transmission cycle 2 and SSBs in transmission cycle 3.
In another implementation, in the case that a certain SSB in a certain transmission cycle is searched, the first terminal device 202 determines the resource location of the SSB in the next or next transmission cycles or the resource locations of the SSB in multiple transmission cycles. Assuming that the first terminal device 202 searches for SSB-3 in transmission cycle 1, the resource location of SSB-3 in transmission cycle n is determined, or the resource location of SSB-3 in each of transmission cycles i through j is determined. Wherein n, i and j are positive integers, which represent the next transmission cycle of transmission cycle 1, and j is greater than i. Thereafter, the first terminal device 202 may send indication information to the second terminal device 203, where the indication information is used to indicate the resource location of SSB-3 in transmission cycle n or used to indicate the resource location of SSB-3 in each of transmission cycles i through j. The second terminal apparatus 203, upon receiving the indication information, may receive the SSB in the transmission cycle n, or the SSBs in a plurality of transmission cycles, from the network apparatus 201 according to the indication information.
In the above two implementation manners, when the second terminal device 203 receives the SSB from the network device 201, it may receive SSB-3, or may receive SSB-1, SSB-2, or SSB-4. If the relative position between different SSBs in an SSB burst is predefined or fixed, e.g., the relative positions between SSB-3 and SSB-1, SSB-3 and SSB-2, and/or SSB-3 and SSB-4 are fixed, the second terminal device can obtain the positions of SSB-1, SSB-2, and/or SSB-4 according to the position of SSB-3, so as to receive SSB-1, SSB-2, or SSB-4. In a similar manner, the indication information sent by the first terminal apparatus 202 to the second terminal apparatus 203 may not indicate the resource location of SSB-3, but indicate the resource location of SSB-1, SSB-2 or SSB-4 in the transmission period.
The first terminal device 202 does not know the resource location of the SSB when blindly detecting the SSB broadcast by the network device 201, and unlike the first terminal device 202, the second terminal device 203 may not directly search or blindly detect the SSB broadcast by the network device 201, but knows the resource location of the SSB through the indication information of the first terminal device 202, and receives the SSB from the network device 201 according to the resource location, thereby reducing power consumption when the second terminal device 203 receives the SSB from the network device, and enabling the second terminal device 203 to obtain the SSB broadcast by the network device 201 with smaller power consumption.
Optionally, in this embodiment of the application, the second terminal device may perform: receiving indication information from the first terminal equipment, and receiving SSB from the network equipment according to the indication information; and, blindly detecting SSBs from the network device. After acquiring the SSB in one of the ways, the second terminal device may stop the process. By the method, the second terminal equipment can be accelerated to acquire the SSB from the network equipment, so that the power consumption of the second terminal equipment in acquiring the SSB is reduced.
The indication information may be carried by a side link synchronization signal (SL-SS), or may be carried by a side link control channel, a side link data channel, or a side link broadcast channel. That is, the indication information may be sent from the first terminal device to the second terminal device through the SL-SS, the sidelink control channel, the sidelink data channel, or the sidelink broadcast channel.
The transmission period refers to a transmission period of the SSB burst, and may also be described as a transmission period of the synchronization signal block set, where the transmission period of the SSB burst may be one of {5ms,10ms,20ms,40ms,80ms, and 160ms }, or may be another value, and the embodiment of the present application is not limited. The embodiments of the present application are described by taking SSB as an example, and the technical essence of the embodiments is to avoid the second terminal device from blindly detecting information from the network device, and other names, terms, or methods for describing the technical essence also fall within the scope of the embodiments of the present application. For example, the SSB in the method provided by the embodiment of the present application may be replaced by information or a channel for carrying the synchronization signal, or information or a channel for transmitting the synchronization signal, etc.; for example, the SSB in the method provided by the embodiment of the present application may be replaced by a broadcast channel for carrying a broadcast signal, or replaced by a reference signal of the broadcast signal, and the like.
The communication between the first terminal device 202 and the second terminal device 203 may be implemented by a sidelink, and the communication mode may be a unicast mode, a multicast mode, or a broadcast mode. Unicast is a one-to-one communication mode between terminal devices, and a terminal device capable of receiving unicast data is a single terminal device. Multicast is a one-to-many communication mode between end devices, and end devices capable of receiving multicast data are end devices within a specific group. Broadcast is a pair of all communication modes between terminal devices, and terminal devices in a specific area around a transmitting end can receive broadcast data.
The embodiment of the present application may be applied to a scenario in which the second terminal device 203 has not started to search for the SSB, or has started to attempt to search for the SSB but has not searched for the SSB. The second terminal device 203 may or may not have already been synchronized with the first terminal device 202 in the process of acquiring the SSB through the first terminal device 202.
The network architecture shown in fig. 2 takes a 5G system as an example, and the embodiment of the present application can also be applied to the fourth generation (4)thGeneration, 4G) mobile communication technology system (such as L)TE) and may also be applied in future communication systems, e.g. sixth generation (6)thgeneration, 6G) mobile communication technology system, and the like, which are not limited in the embodiments of the present application.
The embodiments of the present application may also be applied to a system including three communication entities, including a first entity (e.g., a base station), a second entity (from which a signal can be blindly detected), and a third entity (from which the signal is received from the first entity with the assistance of the second entity). The first entity may broadcast a synchronization signal; the second entity can receive the synchronous signal from the first entity and send the indication information of the synchronous signal to the third entity; the third entity may receive indication information of the synchronization signal from the second entity and receive the synchronization signal from the first entity according to the indication information. Wherein, the second entity receives the synchronization signal from the first entity, and the synchronization signal can be blindly detected from the first entity; or the fourth entity may indicate the location of the synchronization signal to the second entity, so that the second entity may receive the synchronization signal from the first entity, which is not limited in the embodiments of the present application.
The resource locations referred to in the embodiments of the present application may include one or more of the following: time domain resource location, frequency domain resource location, code domain resource location, and space domain resource location.
The synchronization signal block indication method provided by the embodiment of the present application will be described in detail below with reference to the network architecture shown in fig. 2. In the introduction process, the first terminal device takes the CUE as an example, the second terminal device takes the TUE as an example, and the resource location includes the time domain resource location and the frequency domain resource location as an example.
Referring to fig. 3, a flow chart of a synchronization signal block indication method provided in the embodiment of the present application may include, but is not limited to, the following steps:
301, the network device broadcasts an SSB burst.
The network device may periodically broadcast the SSB bursts to UEs within its coverage area, e.g., to UEs in the cell it covers. The period of broadcasting the SSB burst may be understood as a transmission period of the SSB burst, and may be one of {5ms,10ms,20ms,40ms,80ms,160ms }, or another value, which is not limited in the embodiments of the present application. For example, the transmission period of the SSB burst is 20ms, the SSB burst size is 4, and the network device broadcasts one SSB burst every 20ms, where the SSB burst includes 4 SSBs.
Optionally, the network device further broadcasts the system information to the UEs in its coverage periodically, and the period of broadcasting the system information may be the same as or different from the period of broadcasting the SSB burst. The system information and the SSB burst can be carried in the same information for broadcasting, and can also carry different information for broadcasting respectively.
302, the CUE searches for SSBs and determines the resource locations of the SSBs.
The CUE searches the SSB broadcast by the network equipment and determines the resource location of the SSB under the condition that the SSB is searched in the current transmission period i. Further, the CUE may determine the resource location of the SSB or other SSBs in the subsequent transmission period i + k. Wherein, the current transmission period i and the subsequent transmission period i + k both refer to the transmission period of the SSB burst. Wherein i is an integer, such as 0, 1, 2 or other integers, and k is a positive integer, such as 1, 2, 3 or other positive integers, which is not limited in the embodiments of the present application.
For example, see the exemplary diagram of the CUE search SSB shown in fig. 4, which assumes SSB burst size of 4, i.e. 4 SSBs are transmitted in 5 ms; the transmission period of the SSB burst is 20 ms; the transmission period of the current SSB burst is the transmission period i of the SSB burst. The CUE searches SSB-3 in the transmission period i of the SSB burst through blind detection, and the SSB-3 can be regarded as the SSB with the highest receiving power or signal-to-noise ratio on the CUE side in the four SSBs, or the SSB with the receiving energy or the signal-to-noise ratio exceeding the threshold, and the like.
The CUE can determine the resource position of SSB-3 in the transmission period i of the SSB burst, and then the resource position of the SSB determined by the CUE is the resource position of the SSB-3 searched by the CUE in the transmission period i of the SSB burst. The SSB searched by the CUE can also be described as the SSB received by the CUE, or the SSB that the CUE expects the TUE to receive, etc. In the embodiment of the present application, if the distance between the CUE and the TUE is close, that is, the distance between the CUE and the TUE is smaller than the preset value (for example, 5m, etc.), so that the TUE and the CUE can receive the same beam, the TUE and the CUE can receive the same SSB in the transmission cycle of the same SSB burst, or receive the same SSB in the transmission cycle of different SSB bursts, and the SSB may be referred to as an SSB that the CUE expects the TUE to receive. In fig. 4, SSBs that a TUE can receive or SSBs that a CUE expects a TUE to receive are shaded in black.
The CUE can obtain the transmission period of the synchronization signal block set according to the SSB. The CUE can acquire the common search space of a cell (i.e. the cell to which the CUE belongs) or a group of UEs (i.e. a group of UEs including the CUE) according to the MIB indication in the SSB when receiving SSB-3. Namely, the CUE acquires resource configuration information of a Physical Downlink Control Channel (PDCCH), and searches the public PDCCH in a search space of the public PDCCH according to the resource configuration information; acquiring Downlink Control Information (DCI) carried on the common PDCCH under the condition that the common PDCCH is searched; receiving a Physical Downlink Shared Channel (PDSCH) according to the indication of the DCI, wherein the PDSCH carries the SIB 1. The parameter (for example, SSB-periodicityserving cell) in the SIB1 may indicate a transmission period of the SSB burst, that is, a transmission period of the synchronization signal block set, so that a UE within a coverage of the network device may know the transmission period of the synchronization signal block set, and may further determine an SSB that may be searched by the UE in a subsequent transmission period of the SSB burst.
Further, the CUE can determine the resource location of SSB-3 in the transmission period of the subsequent SSB burst after receiving SSB-3 in the transmission period i of the SSB burst. Specifically, the resource location of SSB-3 in the transmission period of the subsequent SSB burst may be determined according to the resource location of SSB-3 in the transmission period i of the SSB burst and the transmission period of the SSB burst indicated by SIB1, for example, the resource location of SSB-3 in the transmission period i +1 of the SSB burst, the resource location of SSB-3 in the transmission period i +2 of the SSB burst, and so on. The resource location of the SSB determined by the CUE is the resource location of SSB-3 in the transmission cycle of the subsequent SSB burst.
As can be seen from the above summary, in the first implementation manner, the CUE determines the resource location of the first SSB, where the first SSB is an SSB searched by the CUE in the transmission cycle of the SSB burst where the first SSB is located; in a second implementation manner, the CUE determines the resource location of the second SSB, and the location of the second SSB in the transmission cycle of the SSB burst where the second SSB is located is the same as the location of the first SSB in the transmission cycle where the first SSB is located. For example, the first SSB is SSB-3 in transmission period i of the SSB burst, and the second SSB is SSB-3 in transmission period i +1 of the SSB burst.
For example, the CUE determining the resource location of the first SSB may include determining the time domain resource location of the first SSB, or determining the frequency domain resource location of the first SSB, or determining the time domain resource location of the first SSB and the frequency domain resource location of the first SSB.
The CUE may refer to the foregoing (3) scanning the frequency domain during the process of searching for the SSB by the terminal device, and determine the frequency domain resource location of the first SSB. The frequency domain resource locations may be represented by one or more of frequency points, frequency domain grids, Resource Blocks (RBs) mapped thereto, and subcarriers mapped thereto, etc. The frequency point of the SSB may include a frequency point of a center frequency of the SSB, a frequency point of a start frequency, or a frequency point of an end frequency of the SSB, etc. The RBs to which the SSBs are mapped may include a starting RB, a center RB, or an ending RB to which the SSBs are mapped, etc. The subcarriers to which the SSB is mapped may include a start subcarrier, a center subcarrier, or an end subcarrier to which the SSB is mapped, etc.
For example, the CUE may try the N and M values for a plurality of times according to table 1 and the frequency band (e.g., 0 to 3000MHz) of the cell where the CUE is located, and then determine the frequency point of the center frequency of the first SSB. The CUE can acquire the frequency band of the cell in which the CUE is located through the process of searching the public PDCCH.
The CUE may refer to the foregoing (3) scanning the time domain in the process of searching for the SSB by the terminal device, and determine the time domain resource location of the first SSB. The time domain resource location may be represented by one or more of seconds, milliseconds, frame index, subframe index, slot index, symbol index (symbol), for example, the time domain resource location of the first SSB may be represented as the third symbol of the first slot of the first subframe of the second frame.
For example, the CUE determining the resource location of the second SSB may include determining a time domain resource location of the second SSB, or determining a frequency domain resource location of the second SSB, or determining both the time domain resource location of the second SSB and the frequency domain resource location of the second SSB. Optionally, the frequency domain resource location of the second SSB is the same as the frequency domain resource location of the first SSB. The time domain resource location of the second SSB differs from the time domain resource location of the first SSB by one or more SSB burst transmission periods. For example, if the first SSB is SSB-3 in the transmission period i of the SSB burst and the second SSB is SSB-3 in the transmission period i +2 of the SSB burst, the time domain resource location of the second SSB differs from the time domain resource location of the first SSB by two transmission periods of the SSB burst, and if the transmission period of the SSB burst is 20ms, the time domain resource location of the second SSB differs from the time domain resource location of the first SSB by 40 ms.
Optionally, in the present application, the SSB that the TUE may receive or the CUE expects the TUE to receive may be different from the SSB received by the CUE. Illustratively, the SSB received by the CUE is SSB-3, and the CUE estimates that the SSB that the TUE can receive is SSB-4 from the relative position between the TUE and the CUE, and then the CUE can indicate the position of SSB-4 to the TUE. When the indicated SSB-4 and the SSB-3 received by the CUE are in the transmission period of the same SSB burst, the indicated SSB-4 can be regarded as a first SSB, and when the indicated SSB-4 and the SSB-3 received by the CUE are not in the transmission period of the same SSB burst, the indicated SSB-4 can be regarded as a second SSB. The relative resource locations of SSB-3 and SSB-4 are predefined or fixed during a SSB burst transmission period. For simplicity of description, in various embodiments of the present application, the SSB that the TUE can receive or the CUE expects the TUE to receive is described as the same as the SSB received by the CUE.
Optionally, in this application, the SSB received by the TUE may be different from the SSB received by the CUE, for example, the SSB received by the CUE is SSB-3, the SSB received by the TUE may be SSB-4, and the like, which is not limited in this embodiment of the application. Illustratively, the SSB received by the CUE is SSB-3, the CUE indicates the location of SSB-3 to the TUE, which may estimate the location of SSB-1, SSB-2, and/or SSB-4 from the location of SSB-3 and attempt to receive the indicated SSB-3 and the estimated SSB-1, SSB-2, and/or SSB-4, the SSB received by the TUE being SSB-4. In the transmission period of one SSB burst, the resource location of each SSB is predefined or fixed, or the relative resource locations of one SSB and another SSB are predefined or fixed.
303, the CUE sends a sidelink synchronization signal to the TUE. Accordingly, the TUE receives a sidelink synchronization signal from the CUE.
The sidelink synchronization signal may carry indication information, which may be used to indicate a resource location of the first SSB or indicate a resource location of the second SSB. The sidelink synchronization signal may carry this indication, and may also be described as: the indication information is transmitted or received through a sidelink synchronization signal, or indicates the resource location of the first SSB or the second SSB through a sidelink synchronization signal, or the like.
Optionally, the pattern of the sidelink synchronization signal is used to indicate the resource location of the synchronization signal block. The resource location of the first SSB or the second SSB is indicated by the indication information, and specifically, the resource location of the first SSB or the second SSB can be indicated by a pattern (pattern) of the sidelink synchronization signal.
In one implementation, a pattern of sidelink synchronization signals corresponds to an index, as shown in table 2. For example, the agreement may agree on a table between the CUE and TUE, or the CUE and TUE agree on the table by other means. Each row in the table is used to indicate a time domain resource location, a frequency domain resource location, and/or a time frequency domain resource location of a first SSB or a second SSB. In the embodiment of the present application, each row represents one time-frequency resource position offset (offset) (or range of offsets), which can be referred to as table 2 below. The values in table 2 are merely examples, and other values may be used in practice; the number of the patterns in table 2 is only an example, and other numbers of the patterns may be used in practical applications, and the embodiments of the present application are not limited.
TABLE 2
Optionally, a pattern (pattern) of the sidelink synchronization signal is used to indicate a frequency domain position offset, and/or a time domain position offset of the sidelink synchronization signal relative to the first SSB or the second SSB. In table 2, the bin offset indicates a bin offset of the sidelink synchronization signal with respect to the first SSB or the second SSB, and the offset may be a certain value or a range. The unit of the bin offset may be RB or subcarrier, or N or M value in table 1, and the bin offset represents frequency domain offset information. The time domain offset information indicates a time domain offset of the sidelink synchronization signal with respect to the first SSB or the second SSB, and may be represented by slot offset and symbol offset, which may be determined values or ranges. In table 2, the offset may be a positive value or a negative value, or may be 0, for example, a positive value indicates a right offset or an upper offset, and a negative value indicates a left offset or a lower offset. Alternatively, slot offset may be predefined as 0, or symbol offset may be predefined as 0. Alternatively, the frequency bin offset may be predefined as 0.
Optionally, a pattern (pattern) of the sidelink synchronization signal is used to indicate a frequency domain position offset, and/or a time domain position offset of the reference position relative to the first SSB or the second SSB. For example, in table 2, the bin offset represents a bin offset of the reference position with respect to the first SSB or the second SSB, and the slot offset and symbol offset represent a time domain offset of the reference position with respect to the first SSB or the second SSB. Alternatively, the reference position is a time domain position of a first symbol of the side link synchronization signal and a frequency domain position of the start frequency, or a time domain position of a first symbol of the side link synchronization signal and a frequency domain position of the center frequency, and the like. The reference location may be preconfigured, or may be signaled, where the signaling may be notified to the CUE and the TUE by the network device, or notified to the TUE by the CUE, which is not limited in the implementation of the present application. Alternatively, slot offset may be predefined as 0, or symbol offset may be predefined as 0. Alternatively, the frequency bin offset may be predefined as 0.
For example, taking the ue indicating the resource location of the second SSB to the TUE as an example, the ue selects index2 from table 2 according to the resource location of the second SSB and the location of the sidelink synchronization signal, so that the frequency point representing the starting frequency of the sidelink synchronization signal is offset by 5 RBs relative to the frequency point of the starting frequency of the second SSB, the slot where the first symbol of the sidelink synchronization signal is located is offset by 2 slots relative to the slot where the first symbol of the second SSB is located, and the symbol location where the first symbol of the sidelink synchronization signal is located is offset by 1 symbol relative to the symbol location where the first symbol of the second SSB is located.
The CUE may determine a pattern of the sidelink synchronization signal according to the determined index in case of determining the index. The sidelink synchronization signals may include sidelink primary synchronization signals (SL-PSS) and sidelink secondary synchronization signals (SL-SSS), and the CUE determines patterns of SL-PSS and SL-SSS, respectively. The pattern of the sidelink synchronization signal may also be referred to as a sequence value of the sidelink synchronization signal.
In one implementation, the SL-PSS sequence value dPSSAccording to
There are three patterns, which can be expressed as:
wherein the content of the first and second substances,
x(i+7)＝(x(i+4)+x(i))mod2，[x(6) x(5) x(4) x(3) x(2) x(1) x(0)]＝[1 1 1 0 1 1 0]。d PSShas a sequence length of 128, dPSS(n) represents dPSSThe nth element.
SL-SSS sequence value dSSSAccording to
There are 336 patterns, which can be expressed as:
d SSS(n)＝[1-2*x 0((n+m 0)mod127)]*[1-2*x 1((n+m 1)mod127)]
wherein, the first and the second end of the pipe are connected with each other,
x 0(i+7)＝(x 0(i+4)+x 0(i))mod2，x 1(i+7)＝(x 1(i+1)+x 1(i))mod2， [x 0(6) x 0(5) x 0(4) x 0(3) x 0(2) x 0(1) x 0(0)]＝[0 0 0 0 0 0 1]，[x 1(6) x 1(5) x 1(4) x 1(3) x 1(2) x 1(1) x 1(0)]＝[0 0 0 0 0 0 1]。d SSShas a sequence length of 128, dSSS(n) represents dSSSThe nth element.
The side link Identification (ID) may be expressed as
Similar to cell ID may be expressed as
The SL-PSS has three patterns, while the SL-SSS has 336 patterns, so that the SL-PSS and the SL-SSS can be combined to form 1008 different patterns of side-chain synchronous signals. In the 1008 sidelink synchronization signals pattern, part or all of the pattern can be used to correspond to the value of index in table 2, i.e. to indicate a certain row in table 2.
In one implementation, the protocol may agree on a correspondence between the sidelink synchronization signal pattern and each index in table 2. In another implementation, the network device may also configure a sidelink synchronization signal pattern for the CUE and the TUE through a higher layer signaling and the result is shown in table 2The index (provided that the CUE and the TUE have entered Radio Resource Control (RRC) connection). For example, the correspondence between the sidelink synchronization signals pattern and index can be expressed as:
the CUE determines pattern according to the selected index value, namely determining
And
namely determining patterns of the SL-PSS and the SL-SSS, and sending a side link synchronization signal corresponding to the determined patterns to the TUE by the CUE through the side link. It can also be understood that the CUE sends the determined sidelink synchronization signal corresponding to the pattern to the TUE. The CUE may send a sidelink synchronization signal to the TUE in a unicast or broadcast or multicast manner.
In one implementation, the CUE may increase the density of side link synchronization signals (SL-SSs) in the time-frequency domain relative to the SSBs, sending the SL-SSs to the TUE to reduce the number of times the TUE searches for the SL-SS, thereby reducing the power consumption of the TUE. Illustratively, increasing the density of the SL-SSs in the time domain causes the CUE to send the SL-SSs to the TUE more frequently in the time domain. Increasing the SL-SS density in the time domain can also be described as the SL-SS transmission period is shorter than the SSB burst transmission period, e.g., the SSB burst transmission period is 40ms, then the SL-SS transmission period can be 20 ms.
In one implementation, the transmission period of the SL-SS may be agreed or predefined in the protocol, and then the CUE sends the SL-SS to the TUE according to the agreed transmission period of the SL-SS, thereby reducing the number of times the TUE searches for the SL-SS and thus reducing the power consumption of the TUE. Or, predefining a frequency point and a period for sending the SL-SS in an SIM card (or called as a subscriber identity identification card) of the CUE, and sending the SL-SS to the CUE by the CUE according to the frequency point and the period predefined by the SIM card, so that the number of times of searching the SL-SS by the TUE is reduced, and the power consumption of the TUE is further reduced.
The CUE may send SL-SSs of one pattern to the TUE, or may send SL-SSs of multiple patterns to the TUE.
Optionally, the CUE sends the transmission period of the SSB burst to the TUE, so that the TUE knows the transmission period of the SSB burst, determines the resource location of the second SSB, or determines the resource location of the SSB that may be received by the TUE in the transmission period of the subsequent SSB burst. The transmission period of the SSB burst may also be indicated by an indication message, which may be sent to the TUE together with the SL-SS or separately.
The TUE determines the resource location of the SSB based on the sidelink synchronization signal 304.
In a scene that the TUE does not detect the SL-SS sent by the CUE, the TUE can blindly detect the SL-SS on a time-frequency resource, and the process of blindly detecting the SL-SS is similar to the process of searching the SSB by the terminal equipment, namely searching the SL-SS at a time-frequency position where the SL-SS possibly appears. In a scenario where the TUE has detected the SL-SS sent by the CUE, the TUE may obtain the location of the other SL-SS according to the previously detected SL-SS, and then receive the other SL-SS. Wherein the SL-SS is transmitted periodically or at a predefined fixed location. When receiving the SL-SS, the TUE detects patterns of the SL-PSS and SL-SSS sequences, further determines an index corresponding to the patterns, for example, determines a row corresponding to the index in Table 2, and further determines the resource position of the SSB according to the resource position of the SL-SS and the row.
In one implementation, the pattern of the SL-SS is used to indicate the resource location of the first SSB, then table 2 is used to indicate offset information of the first SSB with respect to the SL-SS, and the TUE determines a corresponding index according to the resource location of the SL-SS and the pattern of the SL-SS when receiving the SL-SS, determines a row corresponding to the index in table 2, and further determines the resource location of the first SSB.
Further, the TUE may determine the resource location of the second SSB according to the transmission period of the SSB burst when determining the resource location of the first SSB. The second SSB is the same SSB in the transmission period of a different SSB burst than the first SSB.
In one implementation, the pattern of the SL-SS is used to indicate the resource location of the second SSB, then table 2 is used to indicate offset information of the second SSB with respect to the SL-SS, and the TUE determines a corresponding index according to the resource location of the SL-SS and the pattern of the SL-SS when receiving the SL-SS, determines a row corresponding to the index in table 2, and further determines the resource location of the second SSB.
The TUE receives the SSB from the network device 305 based on the SSB's resource location.
In one implementation, if the TUE determines the resource location of the first SSB, the TUE receives the first SSB from the network device at the resource location. The TUE may not receive the first SSB considering the transmission delay, and then further determines a resource location of a second SSB at which the second SSB is received from the network device.
In one implementation, if the TUE determines the resource location of the second SSB, the TUE receives the second SSB from the network device at the resource location.
For example, see an exemplary diagram of the TUE acquiring the SSB shown in fig. 5, in this example, assuming that the SSB burst size is 4, the CUE sends two patterns of SL-SSs successively within the observed time, where the first pattern indicates offset information 1, and the second pattern indicates offset information 2. And the TUE determines the offset information corresponding to the first pattern or the second pattern under the condition of receiving the SL-SS of the first pattern or the second pattern, and further determines the resource position of the SSB.
In the embodiment shown in fig. 3, the TUE does not need to directly blind detect the SSB broadcast by the network device, and obtains the resource location of the SSB from the SL-SS received from the CUE, and further receives the SSB from the network device through the resource location. Therefore, the TUE does not need to directly and blindly detect the SSB broadcast by the network equipment, and the times of searching the SSB by the TUE can be reduced; SSB is received from network equipment through SL-SS of CUE, and the SSB can be obtained with low power consumption; further, the embodiment of fig. 3 may slow down the power consumption of the TUE. The CUE can increase the density of the SL-SS in a time-frequency domain, send the SL-SS to the TUE, reduce the number of times that the TUE searches for the SL-SS, and further reduce the power consumption of the TUE.
Referring to fig. 6, a flow chart of another method for indicating a synchronization signal block according to the embodiment of the present application may include, but is not limited to, the following steps:
601, the network device broadcasts the SSB burst.
602, the CUE searches for SSBs and determines the resource locations of the SSBs.
The implementation process of step 601-step 602 can refer to the detailed description of step 301-step 302 in the embodiment shown in fig. 3, and is not described herein again.
603, the CUE sends indication information to the TUE. Accordingly, the TUE receives the indication information from the CUE. The indication information is used for indicating the resource location of the first SSB or the second SSB.
In a possible implementation manner of the first indication information, the indication information is carried on a side link control channel (PSCCH), which may also be described as that the indication information is carried on the PSCCH, or the CUE is sent by the CUE to the TUE through the PSCCH, or the PSCCH indicates a resource location of the first SSB or the second SSB. The PSCCH is used to carry side link control information (SCI), and optionally, the SCI may also carry indication information. The SCI may indicate control of the transmitting end to the receiving end in the sidelink, and the payload is small, for example, the SCI is used to indicate scheduling information of a sidelink data channel (psch or PSDCH). The sidelink data channel is used for carrying sidelink data information, and can be scheduled by SCI, and the carrying information can be more.
The indication information may include time domain indication information, or frequency domain indication information, or both time domain indication information and frequency domain indication information.
For the case that the indication information includes time domain indication information, the time domain indication information can be indicated in any one of the following three manners (for example, the indication information is used to indicate the resource location of the second SSB, and the method for indicating the resource location of the first SSB by the indication information is similar):
in a first manner, the time domain indication information is used to indicate the time domain resource location of the second SSB, which may be understood as that the time domain indication information is used to directly indicate the time domain resource location of the second SSB, and may be understood as an absolute time indication manner. Wherein the time domain resource location of the second SSB may comprise at least one of: the frame number or range of the radio frame in which the second SSB is located, the subframe number or range of the subframe, the slot number or range of the slot, and the index or range of the symbol. Alternatively, the time domain indication information may indicate an index, which may be used to determine the time domain resource location of the second SSB. See, for example, table 3 below. After the TUE receives the index from the CUE, it may look up table 3, and obtain the time domain resource location of the second SSB through table 3. The values in table 3 are merely examples, and other values are possible in practical applications; the number of rows of the index in table 3 is merely an example, and other rows may be used in practical applications, and the embodiment of the present application is not limited.
TABLE 3
In table 3, some or all of the parameters may be set as default values, and specific parameters that are default values may be agreed by the CUE and the TUE through a protocol or the like. Alternatively, the partial parameter may be a certain column or a certain number of columns of parameters in table 3 except for the column of index, for example, the column of parameters of the subframe number or range of the subframe where the second SSB is located may be set as a default value; all parameters may be parameters of all columns in table 3 except for the index column. The TUE may be notified by the CUE for the part of the parameters that is not the default value, for example, the CUE notifies the TUE of an offset from the parameter corresponding to the index notified last time, which may reduce signaling overhead. For example, the list of parameters of the slot number of the slot where the second SSB is located is not a default value, the CUE may notify the TUE of the offset from the slot number of the slot where the second SSB corresponding to the index notified last time, and if the offset is 2, the index notified last time is 2, and the slot number of the slot where the second SSB corresponding to index2 is 2, the TUE may know that the slot number of the slot where the second SSB is located this time is 4 or 0. For another example, the column of parameters of the slot number of the slot where the second SSB is located is not a default value, the CUE may notify the TUE of the offset relative to the preset value, and if the offset is 2 and the preset value is 2, the TUE may know that the slot number of the slot where the second SSB is located is 4 or 0 this time. The preset value may be agreed upon by the protocol. In the case of SCI default, the TUE defaults to obtaining some or all of the parameters. The SCI default may be understood as the CUE not sending SCI, or the CUE not sending indication information.
In the second mode, the time domain indication information is used to indicate a time domain resource position of the second SSB relative to the PSCCH, which may be understood as time domain indication information used to indicate a relative time between the second SSB and the PSCCH, which may be understood as a relative time indication mode. The time domain resource position of the second SSB relative to the PSCCH may be, for example, the time domain resource position of the second SSB relative to the first symbol of the PSCCH, that is, the position of the first symbol of the PSCCH is used as a reference time domain position. In a second mode, the time domain resource location may include at least one of: an offset frame number (optionally, if the frame number is not offset, the offset frame number is not included or is 0), an offset subframe number (optionally), an offset slot number, and an offset symbol number. Alternatively, the time domain indication information may indicate an index, which may be used to indicate a time domain resource location of the second SSB relative to the PSCCH. See, for example, table 4 below. After the TUE receives the index and the PSCCH from the CUE, the TUE may look up table 4, obtain the time domain offset of the second SSB with respect to the PSCCH through table 4, and further obtain the time domain resource location of the second SSB according to the time domain resource location of the PSCCH and the time domain offset. The values in table 4 are merely examples, and other values may be used in practice; the number of rows of the index in table 4 is merely an example, and other rows may be used in practical applications, and the embodiment of the present application is not limited.
TABLE 4
| index | Offset subframe number | Offset slot number | Number of offset |
| 1 | 1 | 1 | 0 |
| 2 | 5 | 2 | 1～2 |
| 3 | 10～12 | 4 | 10 |
| 4 | 0 | 10～16 | 10～14 |
In table 4, some or all of the parameters (refer to the corresponding explanations in table 3) may be set as default values, and specific parameters that are default values may be agreed by the CUE and the TUE through protocols and the like; for those portions of the parameters that are not default values, the TUE may be notified by the CUE. In the case of SCI default, the TUE defaults to obtaining some or all of the parameters.
In a third mode, the time domain indication information is used to indicate a time domain resource location of the second SSB relative to the sidelink data channel, which can be understood as the time domain indication information is used to indicate a relative time between the second SSB and the sidelink data channel. The side-link data channel is a data channel associated with the PSCCH, and may be understood as a side-link data channel scheduled by the PSCCH, that is, a side-link data channel scheduled by the PSCCH carrying time domain indication information. The third method is also a relative time indication method, similar to the second method.
The TUE, upon receiving the PSCCH or SCI, may determine the time domain resource location of the second SSB, i.e., the time of occurrence of the second SSB, according to the three manners described above.
Optionally, the time domain indication information or the indication information is further used to indicate a transmission period of the SSB burst, so that after the TUE detects the second SSB according to the resource location provided by the CUE, the TUE detects the next or next SSBs according to the transmission period of the SSB burst and accumulates the SSBs, which may enhance the reception strength of the synchronization signal, thereby enhancing coverage, or may receive the updated SSBs. Or the time domain indication information comprises first indication information and second indication information, the first indication information is used for indicating the resource position of the second SSB, and the second indication information is used for indicating the transmission period of the SSB burst. The first indication information and the second indication information may be carried in the same PSCCH or may be carried in different PSCCHs.
For the case that the indication information includes frequency domain indication information, the frequency domain indication information can be indicated using any one of the following three manners (taking the indication information for indicating the resource location of the second SSB as an example, the method for indicating the resource location of the first SSB by the indication information is similar):
in the method a, the frequency domain indication information is used to indicate the frequency domain resource location of the second SSB, which can be understood as the frequency domain indication information is used to directly indicate the frequency domain resource location of the second SSB, and can be understood as an absolute frequency domain indication method. The frequency domain resource location includes an N value and an M value, and optionally includes a frequency band of a cell in which the CUE is located, and the TUE may determine the frequency point of the second SSB according to the N value, the M value, and the frequency band, in combination with table 1. The CUE can inform the TUE of the frequency band of the cell where the CUE is located, the TUE can reside in the same frequency band with the CUE, and then the frequency band of the cell where the CUE is located can also be regarded as the frequency band of the cell where the TUE is located. For example, if the frequency band of the cell is 0-3000 MHz, the TUE determines the frequency point of the second SSB using N × 1200kHz + M × 50kHz and the indicated N and M values.
The CUE can indicate which row of the three rows in table 1 the frequency band of the cell in which the CUE is located by log2(3) ═ 2bit, or indicate the index of the frequency band of the cell in which the CUE is located.
Optionally, the TUE may infer the frequency band of the cell in which the TUE is located according to the frequency point in which the PSCCH or SL-SS is located. For example, the frequency point of the SL-SS is 2000MHz, and the TUE can deduce the frequency band of the cell in which the TUE is located is 0-3000 MHz.
In one implementation, the CUE may broadcast the N value and the M value to the TUE so that the TUE may determine the frequency bins for the second SSB.
In the method B, the frequency domain indication information is used to indicate a frequency domain resource position of the second SSB relative to the PSCCH, which may be understood as frequency domain indication information used to indicate a relative frequency domain position between the second SSB and the PSCCH, which may be understood as a relative frequency domain indication manner. The frequency-domain resource location of the second SSB relative to the PSCCH may be a frequency-domain resource location of the second SSB relative to the PSCCHs, and may be, for example, a time-domain resource location of the second SSB relative to a reference frequency location of the PSCCH, for example, the reference frequency-domain location is a lowest frequency-domain location, a middle frequency-domain location, or a highest frequency-domain location of the PSCCH, and the frequency-domain location may be an RB location or a subcarrier location. In the method B, the frequency domain resource location may include an offset value of N and an offset value of M shown in table 1. The TUE calculates a frequency offset value of the second SSB relative to the PSCCH according to the offset value of N and the offset value of M, and determines the frequency domain resource position of the second SSB according to the reference frequency position of the PSCCH. The TUE acquires the frequency band of the cell in which it is located in reference mode a.
Illustratively, the frequency band of the cell in which the TUE is located is 0-3000 MHz, and if the TUE uses the lowest frequency position of the PSCCH as the reference frequency domain position, the frequency point of the second SSB is determined by using N × 1200kHz + M × 50kHz according to the offset value of N and the offset value of M.
In the method C, the frequency domain indication information is used to indicate the frequency domain resource position of the second SSB relative to the sidelink data channel, which can be understood as the frequency domain indication information is used to indicate the relative frequency domain position between the second SSB and the sidelink data channel. The side-link data channel is a data channel associated with the PSCCH, and may be understood as a side-link data channel scheduled by the PSCCH, that is, a side-link data channel scheduled by the PSCCH carrying frequency domain indication information. The mode C may also be understood as a relative frequency domain indication mode, similar to the mode B.
Optionally, the indication information is further used to indicate a cell ID, where the cell ID is an identifier of a cell where the TUE or the CUE is located, and may also be understood as a cell ID corresponding to the first SSB or the second SSB. Or the SCI includes first indication information and third indication information, the first indication information being used for indicating a resource location of the second SSB, and the third indication information being used for a cell ID. The first indication information and the third indication information may be carried in the same PSCCH or may be carried in different PSCCHs. The CUE informs the TUE cell ID, and the power consumption of TUE blind detection cell ID can be saved.
For a possible implementation of the first indication information, see the exemplary diagram of indicating SSB by PSCCH shown in fig. 7. In fig. 7, Tx indicates that the transmitting end of the sidelink is CUE, and Rx indicates that the receiving end of the sidelink is TUE.
In a possible implementation manner of the second indication information, the indication information is carried through a sidelink data channel (psch or PSDCH), which may also be described as that the indication information is carried in a sidelink data channel, or the CUE sends the indication information to the TUE through the sidelink data channel, or the sidelink data channel indicates a resource location of the first SSB or the second SSB, and so on.
The indication information may include time domain indication information, or frequency domain indication information, or both time domain indication information and frequency domain indication information.
For the case that the indication information includes time domain indication information, the time domain indication information can be indicated using any one of the following three manners (for example, the indication information is used to indicate the resource location of the second SSB, and the method for indicating the resource location of the first SSB by the indication information is similar):
in a first manner, the time domain indication information is used to indicate the time domain resource location of the second SSB, which may be understood as that the time domain indication information is used to directly indicate the time domain resource location of the second SSB, and may be understood as an absolute time indication manner.
In the second mode, the time domain indication information is used to indicate a time domain resource position of the second SSB relative to the sidelink data channel, which may be understood as time domain indication information used to indicate a relative time between the second SSB and the sidelink data channel, which may be understood as a relative time indication mode.
In a third manner, the time domain indication information is used to indicate a time domain resource position of the second SSB relative to the PSCCH, which may be understood as time domain indication information used to indicate a relative time between the second SSB and the PSCCH, which may be understood as a relative time indication manner. Where PSCCH is a control channel associated with a sidelink data channel, it will be appreciated that a sidelink data channel is a data channel scheduled by PSCCH.
For the case that the indication information includes frequency domain indication information, the frequency domain indication information can be indicated using any one of the following three manners (taking the indication information for indicating the resource location of the second SSB as an example, the method for indicating the resource location of the first SSB by the indication information is similar):
in the method a, the frequency domain indication information is used to indicate the frequency domain resource location of the second SSB, which can be understood as the frequency domain indication information is used to directly indicate the frequency domain resource location of the second SSB, and can be understood as an absolute frequency domain indication method.
In the method B, the frequency domain indication information is used to indicate a frequency domain resource position of the second SSB relative to the sidelink data channel, which may be understood as frequency domain indication information used to indicate a relative frequency domain position between the second SSB and the sidelink data channel, which may be understood as a relative frequency domain indication method.
In the mode C, the frequency domain indication information is used to indicate a frequency domain resource position of the second SSB relative to the PSCCH, and may be understood as frequency domain indication information used to indicate a relative frequency domain position between the second SSB and the PSCCH, and may be understood as a relative frequency domain indication mode. Where PSCCH is a control channel associated with a sidelink data channel, it will be appreciated that a sidelink data channel is a data channel scheduled by PSCCH.
For a possible implementation of the second indication information, see the exemplary diagram of indicating SSB via the sidelink data channel shown in fig. 8.
In a possible implementation manner of the third indication information, the indication information is carried through a sidelink broadcast channel, which may also be described as that the indication information is carried in a sidelink broadcast channel, or the CUE sends the indication information to the TUE through the sidelink broadcast channel, or the sidelink broadcast channel indicates the resource location of the first SSB or the second SSB, and so on.
The indication information may include time domain indication information, or frequency domain indication information, or both time domain indication information and frequency domain indication information.
For the case that the indication information includes time domain indication information, the time domain indication information can be indicated using any one of the following three manners (for example, the indication information is used to indicate the resource location of the second SSB, and the method for indicating the resource location of the first SSB by the indication information is similar):
in a first manner, the time domain indication information is used to indicate the time domain resource location of the second SSB, which may be understood as that the time domain indication information is used to directly indicate the time domain resource location of the second SSB, and may be understood as an absolute time indication manner.
In the second mode, the time domain indication information is used to indicate the time domain resource position of the second SSB relative to the sidelink synchronization signal block, which may be understood as time domain indication information used to indicate the relative time between the second SSB and the sidelink synchronization signal block, which may be understood as a relative time indication mode.
In a third mode, the time domain indication information is used to indicate a time domain resource location of the second SSB relative to the sidelink broadcast channel, which may be understood as the time domain indication information is used to indicate a relative time between the second SSB and the sidelink broadcast channel, which may be understood as a relative time indication mode.
For the case that the indication information includes frequency domain indication information, the frequency domain indication information can be indicated using any one of the following three manners (for example, the indication information is used to indicate the resource location of the second SSB, and the method for indicating the resource location of the first SSB by the indication information is similar):
in the method a, the frequency domain indication information is used to indicate the frequency domain resource location of the second SSB, which can be understood as the frequency domain indication information is used to directly indicate the frequency domain resource location of the second SSB.
In the method B, the frequency domain indication information is used to indicate a frequency domain resource position of the second SSB relative to the sidelink synchronization signal block, and may be understood as frequency domain indication information used to indicate a relative frequency domain position between the second SSB and the sidelink synchronization signal block, and may be understood as a relative frequency domain indication method.
In the method C, the frequency domain indication information is used to indicate the frequency domain resource position of the second SSB relative to the sidelink broadcast channel, which can be understood as the frequency domain indication information is used to indicate the relative frequency domain position between the second SSB and the sidelink broadcast channel.
In the embodiment of the application, the sidelink synchronization signal block comprises a sidelink synchronization signal (SL-SS) and a sidelink broadcast channel, and the SL-SS comprises an SL-PSS and an SL-SSS. The sidelink broadcast channel is similar to PBCH.
For a possible implementation of the third indication information, see the exemplary diagram of indicating SSB via a sidelink broadcast channel shown in fig. 9.
It should be noted that, in possible implementations of the second and third indication information, the same or similar parts as those in the possible implementations of the first indication information may be referred to in the corresponding descriptions in the possible implementations of the first indication information.
The TUE determines the resource location of the SSB based on the indication information 604.
The TUE determines the resource location of the first SSB or the second SSB based on the indication information.
The TUE receives the SSB from the network device according to the SSB's resource location 605.
The implementation process of step 605 may refer to the detailed description of step 305 in the embodiment shown in fig. 3, and is not described herein again.
The TUE determines the resource location of the SSB according to the indication information, and can acquire the SSB at the resource location, and also can search and acquire the SSB within a resource location range. In detecting the SSB, the SSB is detected using the synchronization signal sequence value corresponding to the cell ID. Wherein, the sequence values of PSS and SSS in SSB can refer to the sequence values of SL-PSS and SL-SSS in step 303, and the side link communication ID in step 303 is replaced by the cell ID. If the CUE does not inform the TUE cell ID, the TUE needs to detect the SSB correctly at most 1008 times when detecting the SSB, and after the TUE knows the cell ID, the SSB can be correctly detected at most once when detecting the SSB, so that the power consumption of the TUE can be reduced.
In the embodiment shown in fig. 6, the TUE does not need to directly blind detect the SSB broadcast by the network device, and obtains the resource location of the SSB through the indication information sent from the CUE, so as to receive the SSB from the network device through the resource location. Therefore, the TUE does not need to directly and blindly detect the SSB broadcast by the network equipment, and the times of searching the SSB by the TUE can be reduced; informing the TUE cell ID through the CUE can reduce the power consumption of the TUE blind detection cell ID; further, the embodiment of fig. 6 may slow down the power consumption of the TUE.
It is understood that in the embodiment shown in fig. 3, the CUE implicitly indicates the resource location of the SSB through the SL-SS; in the embodiment shown in fig. 6, the CUE explicitly indicates the resource location of the SSB through side link control information or indication information in a side link data channel or a side link broadcast channel. Exemplarily, in the embodiment shown in fig. 3, the TUE is not yet synchronized with the CUE, or the synchronization signal of the CUE has been acquired, and is synchronized with the CUE; in the embodiment shown in fig. 6, the TUE has acquired the synchronization signal of the CUE, synchronized with the CUE, and then the CUE sends indication information to the TUE through the sidelink control information or the sidelink data channel or the sidelink broadcast channel. Both the embodiment shown in fig. 3 and the embodiment shown in fig. 6 enable the TUE to acquire SSBs with low power consumption, thereby slowing down the power consumption speed of the TUE.
In the embodiments provided in the present application, the method provided in the embodiments of the present application is introduced from the perspective of interaction, and the communication system provided in the embodiments of the present application is also introduced. In order to implement the functions in the method provided by the embodiments of the present application, the terminal device and the network device may include a hardware structure and/or a software module, and the functions are implemented in the form of a hardware structure, a software module, or a hardware structure and a software module. Whether any of the above-described functions is implemented as a hardware structure, a software module, or a hardware structure plus a software module depends upon the particular application and design constraints imposed on the technical solution.
Fig. 10 is a schematic diagram of a logic structure of a communication device according to an embodiment of the present application. In fig. 10, the communication device 90 includes a processing module 901 and a communication module 902. The communication apparatus may implement the function of the first terminal device in the embodiment of the present application, and may also implement the function of the second terminal device in the embodiment of the present application.
For the case where the communication apparatus 90 is used to implement the function of the second terminal device in the embodiment of the present application:
a processing module 901, configured to receive, by using the communication module 902, indication information from a first terminal device, where the indication information is used to indicate a resource location of a synchronization signal block; the synchronization signal block is received from the network device using the communication module 902 according to the resource location of the synchronization signal.
The communication device 90 is configured to implement the function of the second terminal device, which may specifically refer to the function implemented by the TUE in the embodiment shown in fig. 3 or fig. 6, and will not be described herein again.
For the case where the communication apparatus 90 is used to implement the function of the first terminal device in the embodiment of the present application:
a communication module 902, configured to send, to the second terminal device, indication information, where the indication information is used to indicate a resource location of a synchronization signal block, where the synchronization signal block is used for communicating with a network device. A processing module 901, configured to determine a resource location of a synchronization signal block.
The communication device 90 is configured to implement the function of the first terminal device, which may specifically refer to the function implemented by the CUE in the embodiment shown in fig. 3 or fig. 6, and details are not repeated here.
The division of the modules in the embodiments of the present application is schematic, and only one logical function division is provided, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processor, may also exist alone physically, or may also be integrated in one module by two or more modules. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
Please refer to fig. 11, which is a schematic diagram of a logic structure of a communication device according to an embodiment of the present application. The communication apparatus 100 shown in fig. 11 may be used to implement the function of the second terminal device in the above method, and the apparatus may be the second terminal device, or an apparatus in the second terminal device, or an apparatus used in cooperation with the second terminal device. The communication apparatus 100 may also be configured to implement the function of the first terminal device in the above method, and the apparatus may be the first terminal device, an apparatus in the first terminal device, or an apparatus used in cooperation with the first terminal device. The communication apparatus 100 may also be used to implement the functions of the network device in the above-described method.
The communication device 100 may be a system-on-a-chip. In the embodiment of the present application, the chip system may be composed of a chip, and may also include a chip and other discrete devices.
The communication device 100 includes at least one processor 1020. For the case where the communication apparatus 100 is used to implement the function of the second terminal device (e.g., TUE), the processor 1020 may execute step 304 in the embodiment shown in fig. 3; step 604 in the embodiment shown in fig. 6. For the case where the communication apparatus 100 is used to implement a first terminal device (e.g., a CUE), the processor 1020 may perform step 302 in the embodiment shown in fig. 3; step 602 in the embodiment shown in fig. 6.
The communications apparatus 100 can also include at least one memory 1030 for storing program instructions and/or data. A memory 1030 is coupled to the processor 1020. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units or modules, and may be in an electrical, mechanical or other form, which is used for information interaction between the devices, units or modules. Processor 1020 may operate in conjunction with memory 1030. Processor 1020 may execute program instructions stored in memory 1030. At least one of the at least one memory may be included in the processor.
The communications apparatus 100 can also include a communication interface 1010 for communicating with other devices over a transmission medium so that the communications apparatus 100 can communicate with other devices. The communication interface may be a transceiver, an interface, a bus, a circuit, or a device capable of performing a transceiving function. When the communication apparatus 100 is used to implement the function of the second terminal device (e.g., TUE), the other device may be a network device or a first terminal device, and the communication interface 1010 may perform steps 303 and 305 in the embodiment shown in fig. 3; step 603 and step 605 in the embodiment shown in fig. 6. When the communication apparatus 100 is used to implement the function of a first terminal device (e.g., CUE), the other device may be a network device or a second terminal device, and the communication interface 1010 may perform step 301 and step 303 in the embodiment shown in fig. 3; step 601 and step 603 in the embodiment shown in fig. 6.
The specific connection medium among the communication interface 1010, the processor 1020 and the memory 1030 is not limited in the embodiments of the present application. In the embodiment of the present application, the memory 1030, the processor 1020, and the communication interface 1010 are connected by a bus 1040 in fig. 11, the bus is represented by a thick line in fig. 11, and the connection manner between other components is merely illustrative and not limited. The bus may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 11, but that does not indicate only one bus or one type of bus.
In the embodiments of the present application, the processor may be a general-purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component, and may implement or execute the methods, steps, and logic blocks disclosed in the embodiments of the present application. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present application may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in a processor.
In the embodiment of the present application, the memory may be a nonvolatile memory, such as a Hard Disk Drive (HDD) or a solid-state drive (SSD), and may also be a volatile memory (RAM), for example. The memory is 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, but is not limited to such. The memory in the embodiments of the present application may also be circuitry or any other device capable of performing a storage function for storing program instructions and/or data.
The embodiment of the present application further provides a communication system, which may include a first terminal device, a second terminal device, and optionally, a network device.
The method provided by the embodiment of the present application may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, cause the processes or functions described in accordance with the embodiments of the invention to occur, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, a network appliance, a terminal device or other programmable apparatus. The computer instructions may be stored on a computer readable storage medium or transmitted from one computer readable storage medium to another, for example, from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optic, Digital Subscriber Line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.). The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device, such as a server, a data center, etc., that incorporates one or more of the available media. The usable medium may be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), optical medium, semiconductor medium, or the like.
In the embodiments of the present application, the embodiments may refer to each other, for example, methods and/or terms between the embodiments of the method may refer to each other, for example, functions and/or terms between the embodiments of the apparatus and the embodiments of the method may refer to each other, without logical contradiction.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.
Claims (41)
- A synchronization signal block indication method, comprising:receiving indication information from a first terminal device, wherein the indication information is used for indicating the resource position of a synchronization signal block;and receiving the synchronous signal block from the network equipment according to the resource position of the synchronous signal block.
- The method of claim 1, wherein the indication information is carried by a sidelink synchronization signal.
- The method of claim 2, wherein the indication information is carried by a sidelink synchronization signal comprising: the pattern of the sidelink synchronization signal is used to indicate the resource location of the synchronization signal block.
- The method of claim 2 or 3, wherein a transmission period of the sidelink synchronization signal is less than a transmission period of a set of synchronization signal blocks, the set of synchronization signal blocks comprising one or more of the synchronization signal blocks.
- The method of claim 1, wherein the indication information is carried over a sidelink control channel.
- The method of claim 5, wherein the indication information comprises time domain indication information;wherein the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the side link control channel is indicated; or, the time domain resource position of the synchronization signal block relative to a sidelink data channel, where the sidelink data channel is a data channel associated with the sidelink control channel.
- The method according to claim 5 or 6, wherein the indication information comprises frequency domain indication information;wherein the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource position of the synchronization signal block relative to the side link control channel is indicated; or, to indicate a frequency domain resource location of the synchronization signal block relative to a sidelink data channel, the sidelink data channel being a data channel associated with the sidelink control channel.
- The method of claim 1, wherein the indication information is carried over a sidelink data channel.
- The method of claim 8, wherein the indication information comprises time domain indication information;the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the side link data channel is indicated; or, the time domain resource position of the synchronization signal block relative to a sidelink control channel, the sidelink control channel being a control channel associated with the sidelink data channel.
- The method according to claim 8 or 9, wherein the indication information comprises frequency domain indication information;wherein the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource position of the synchronization signal block relative to the side link data channel is indicated; or, for indicating a frequency domain resource location of the synchronization signal block relative to a sidelink control channel, the sidelink control channel being a control channel associated with the sidelink data channel.
- The method of claim 1, wherein the indication information is carried over a sidelink broadcast channel.
- The method of claim 11, wherein the indication information comprises time domain indication information;wherein the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the sidelink synchronization signal block is indicated; or, for indicating a time domain resource location of the synchronization signal block relative to the sidelink broadcast channel.
- The method according to claim 11 or 12, wherein the indication information comprises frequency domain indication information;wherein the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource location of the synchronization signal block relative to the sidelink synchronization signal block is indicated; or, for indicating the frequency domain resource location of the synchronization signal block relative to the sidelink broadcast channel.
- The method according to any of claims 1-13, wherein said indication information is further used to indicate a transmission period of a set of synchronization signal blocks, said set of synchronization signal blocks comprising one or more of said synchronization signal blocks.
- The method according to any of claims 1-14, wherein the indication information is further used to indicate a cell identity, and the cell identity is an identity of a cell to which the first terminal device belongs.
- A synchronization signal block indication method, comprising:and sending indication information to a second terminal device, wherein the indication information is used for indicating the resource position of the synchronization signal block, and the synchronization signal block is used for communicating with a network device.
- The method of claim 16, wherein the sending the indication information to the second terminal device comprises:and sending the indication information to the second terminal equipment through the sidelink synchronization signal.
- The method of claim 17, wherein the pattern of the side link synchronization signal is used to indicate a resource location of the synchronization signal block.
- The method of claim 16 or 17, wherein a transmission period of the sidelink synchronization signal is less than a transmission period of a set of synchronization signal blocks, the set of synchronization signal blocks comprising one or more of the synchronization signal blocks.
- The method of claim 16, wherein the sending the indication information to the second terminal device comprises:and sending the indication information to the second terminal equipment through a side link control channel.
- The method of claim 20, wherein the indication information comprises time domain indication information;wherein the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the side link control channel is indicated; or, the time domain resource position of the synchronization signal block relative to a sidelink data channel, where the sidelink data channel is a data channel associated with the sidelink control channel.
- The method according to claim 20 or 21, wherein the indication information comprises frequency domain indication information;wherein the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource location of the synchronization signal block relative to the sidelink control channel is indicated; or, to indicate a frequency domain resource location of the synchronization signal block relative to a sidelink data channel, the sidelink data channel being a data channel associated with the sidelink control channel.
- The method of claim 16, wherein the sending the indication information to the second terminal device comprises:and sending the indication information to the second terminal equipment through a side link data channel.
- The method of claim 23, wherein the indication information comprises time domain indication information;wherein the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the side link data channel is indicated; or, the time domain resource position of the synchronization signal block relative to a sidelink control channel, the sidelink control channel being a control channel associated with the sidelink data channel.
- The method according to claim 23 or 24, wherein the indication information comprises frequency domain indication information;wherein the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource position of the synchronization signal block relative to the side link data channel is indicated; or, for indicating a frequency domain resource location of the synchronization signal block relative to a sidelink control channel, the sidelink control channel being a control channel associated with the sidelink data channel.
- The method of claim 16, wherein the sending the indication information to the second terminal device comprises:and sending the indication information to the second terminal equipment through a sidelink broadcast channel.
- The method of claim 26, wherein the indication information comprises time domain indication information;wherein the time domain indication information is used for indicating the time domain resource position of the synchronization signal block; or, the time domain resource position of the synchronization signal block relative to the sidelink synchronization signal block is indicated; or, for indicating a time domain resource location of the synchronization signal block relative to the sidelink broadcast channel.
- The method according to claim 26 or 27, wherein the indication information comprises frequency domain indication information;wherein the frequency domain indication information is used for indicating the frequency domain resource position of the synchronization signal block; or, the frequency domain resource position of the synchronization signal block relative to the sidelink synchronization signal block is indicated; or, for indicating the frequency domain resource location of the synchronization signal block relative to the sidelink broadcast channel.
- The method according to any of claims 16-28, wherein said indication information is further used for indicating a transmission period of a set of synchronization signal blocks, said set of synchronization signal blocks comprising one or more of said synchronization signal blocks.
- The method according to any of claims 16-29, wherein the indication information is further used to indicate a cell identity, and the cell identity is an identity of a cell to which the second terminal device belongs.
- A communication apparatus, characterized in that the communication apparatus comprises a communication module and a processing module;the processing module, with the communication module: receiving indication information from a first terminal device, wherein the indication information is used for indicating the resource position of a synchronization signal block; and receiving the synchronous signal block from the network equipment according to the resource position of the synchronous signal.
- A communication device, comprising a processor and a communication interface;the processor, with the communication interface: receiving indication information from a first terminal device, wherein the indication information is used for indicating the resource position of a synchronization signal block; and receiving the synchronous signal block from the network equipment according to the resource position of the synchronous signal.
- A communication device arranged to implement the method of any of claims 1 to 15.
- A communication device, comprising a processor and a memory, the memory and the processor coupled such that the communication device performs the method of any of claims 1-15.
- A communication apparatus, characterized in that the communication apparatus comprises a communication module and a processing module;the processing module, with the communication module: and sending indication information to a second terminal device, wherein the indication information is used for indicating the resource position of the synchronization signal block, and the synchronization signal block is used for communicating with a network device.
- A communication device, comprising a processor and a communication interface;the processor, with the communication interface: and sending indication information to a second terminal device, wherein the indication information is used for indicating the resource position of the synchronization signal block, and the synchronization signal block is used for communicating with a network device.
- A communication device arranged to implement the method of any of claims 16 to 30.
- A communication device, comprising a processor and a memory, the memory and the processor coupled such that the communication device performs the method of any of claims 16-30.
- A computer-readable storage medium having stored thereon instructions which, when executed on a computer, cause the computer to perform the method of any one of claims 1-30.
- A computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of any one of claims 1-30.
- A communication system, characterized in that the communication system comprises a first communication device and a second communication device, the second communication device being adapted to implement the method of any of claims 1-15, the first communication device being adapted to implement the method of any of claims 16-30.
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| CN109391420A (en) * | 2017-08-11 | 2019-02-26 | 华为技术有限公司 | The instruction of synchronization signal block and determining method, the network equipment and terminal device |
| CN109474939A (en) * | 2017-09-08 | 2019-03-15 | 维沃移动通信有限公司 | A kind of synchronization signal block measurement method, terminal and the network equipment |
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