User equipment and base station in communication system and method performed by same

Abstract

Disclosed are a user equipment and a base station in a communication system and a method performed by the same. In one embodiment, the method comprises: sending a first synchronization signal block (SSB) request; sSB is detected; and if the SSB is not detected, sending a second SSB request.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to user equipment and a base station in a communication system and methods executed by the same. Background Art

[0002] In order to meet the increased demand for wireless data communication services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or quasi-5G communication systems. Therefore, 5G or quasi-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems."

[0003] 5G communication systems are implemented in higher frequency (millimeter wave, mmWave) bands, such as the 60 GHz band, to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple-input multiple-output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems.

[0004] In addition, in the 5G communication system, development of system network improvements is underway based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, collaborative communications, coordinated multi-point (CoMP), receiving-end interference cancellation, etc.

[0005] In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) as advanced coded modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) as advanced access technologies have been developed. Summary of the invention

[0006] According to one aspect of the present disclosure, a method performed by a user equipment UE in a communication system is provided, comprising: sending a first synchronization signal block SSB request; detecting the SSB; and sending a second SSB request if the SSB is not detected.

[0007] In an exemplary embodiment, not detecting the SSB includes not detecting the SSB within a first time interval after sending the first SSB request.

[0008] In an exemplary embodiment, the first time interval is preset through a protocol, or is acquired by the UE from a base station by receiving signaling.

[0009] In an exemplary embodiment, the first time interval is determined based on a period for the base station to send an SSB burst and the number of times the base station periodically sends an SSB burst, wherein the period and the number are preset by a protocol or are obtained by the UE from the base station by receiving signaling.

[0010] In an exemplary embodiment, the first time interval includes a second time interval after sending the first SSB request and a third time interval after the second time interval, wherein the third time interval is determined based on the period of the base station sending the SSB burst and the number of times the base station periodically sends the SSB burst, and the second time interval, the period and the number are preset by a protocol, or are obtained by the UE from the base station by receiving signaling.

[0011] In an exemplary embodiment, the second time interval includes the processing time of the base station receiving the SSB request and / or the preparation time for sending the SSB, and the processing time of receiving the SSB request and / or the preparation time for sending the SSB are preset by the protocol, or are obtained by the UE from the base station by receiving signaling.

[0012] In an exemplary embodiment, the first SSB request or the second SSB request is an uplink reference signal or uplink control information UCI or is sent through a random access channel.

[0013] In an exemplary embodiment, detecting the SSB includes determining whether the SSB is detected based on a signal strength of a reference signal for detecting the SSB.

[0014] In an exemplary embodiment, the reference signal for detecting the SSB includes one of a primary synchronization signal PSS, a secondary synchronization signal SSS, and a DMRS of a physical broadcast channel PBCH.

[0015] In an exemplary embodiment, detecting the SSB includes: detecting a primary synchronization signal PSS and a secondary synchronization signal SSS in the SSB; and if a physical layer cell identifier PCI of the service cell is obtained through the PSS and the SSS, determining that the SSB is detected, otherwise determining that the SSB is not detected.

[0016] In an exemplary embodiment, detecting SSB includes: detecting the primary synchronization signal PSS, the secondary synchronization signal SSS and the physical broadcast channel PBCH in the SSB; and if the physical layer cell identifier PCI of the service cell is obtained through the PSS and the SSS and the PBCH is successfully demodulated, it is determined that the SSB is detected, otherwise it is determined that the SSB is not detected.

[0017] According to another aspect of the present disclosure, a user equipment UE in a wireless communication system is provided, comprising a transceiver and a processor, wherein the transceiver is configured to send and receive signals, and the processor is coupled to the transceiver and configured to execute a method according to any of the above embodiments.

[0018] According to another aspect of the present disclosure, a computer-readable storage medium is provided, which stores computer instructions. When the stored computer instructions are executed by a processor of a user equipment UE, the processor executes a method according to any of the above embodiments.

[0019] According to another aspect of the present disclosure, a method performed by a base station in a communication system is provided, including: receiving a first synchronization signal block (SSB) request; sending the SSB in response to receiving the first SSB request; receiving a second SSB request, which is resent when the SSB is not detected; and sending the SSB based on the second SSB request.

[0020] In an exemplary embodiment, the method performed by the base station further includes: sending signaling including a first time interval to a user equipment UE, wherein the non-detection of the SSB is determined based on the first time interval.

[0021] In an exemplary embodiment, the method performed by the base station further includes: sending a period of an SSB burst and a number of periodic transmissions of the SSB burst to a user equipment UE, wherein the SSB is not detected based on a first time interval determined by the period and the number of times.

[0022] In an exemplary embodiment, the method performed by the base station further includes: sending a second time interval, a period of an SSB burst, and the number of times the SSB burst is periodically sent to a user equipment UE, wherein the SSB is not detected based on the second time interval and a third time interval determined based on the period and the number.

[0023] In an exemplary embodiment, the method performed by the base station further includes: sending a processing time for receiving an SSB request and a preparation time for sending an SSB to a user equipment UE, wherein the second time interval is determined based on the processing time for receiving the SSB request and / or the preparation time for sending the SSB.

[0024] In an exemplary embodiment, the base station receives the SSB request through an uplink reference signal or uplink control information UCI or signaling sent through a random access channel.

[0025] According to another aspect of the present disclosure, a base station in a wireless communication system is provided, including a transceiver and a processor, wherein the transceiver is configured to send and receive signals, and the processor is coupled to the transceiver and configured to execute a method according to any of the above embodiments.

[0026] According to another aspect of the present disclosure, a computer-readable storage medium is provided, which stores computer instructions. When the stored computer instructions are executed by a processor of a base station, the processor executes a method according to any of the above embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a schematic diagram of the composition structure of various wireless networks according to an embodiment of the present disclosure;

[0028] Figure 2a and Figure 2b is a schematic diagram of wireless transmission and reception paths according to an embodiment of the present disclosure;

[0029] Figure 3a is a block diagram of a structure of a user equipment according to an embodiment of the present disclosure;

[0030] Figure 3b is a block diagram of a base station structure according to an embodiment of the present disclosure;

[0031] Figure 4 An exemplary flow chart of a method executed by a UE according to an embodiment of the present disclosure is shown;

[0032] Figure 5 A specific example of a method performed by a UE according to an embodiment of the present disclosure is shown;

[0033] Figure 6 A specific example of a method performed by a UE according to an embodiment of the present disclosure is shown;

[0034] Figure 7 A specific example of a method performed by a UE according to an embodiment of the present disclosure is shown;

[0035] Figure 8 A specific example of a method performed by a UE according to an embodiment of the present disclosure is shown;

[0036] Fig. 9 An exemplary structure of a user equipment UE according to the present disclosure is shown. DETAILED DESCRIPTION

[0037] The following description with reference to the accompanying drawings is provided to facilitate a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. This description includes various specific details to facilitate understanding but should be considered as exemplary only. Therefore, one of ordinary skill in the art will recognize that various changes and modifications can be made to the various embodiments described herein without departing from the scope and spirit of the present disclosure. In addition, for the sake of clarity and conciseness, descriptions of well-known functions and structures may be omitted.

[0038] The terms and expressions used in the following specification and claims are not limited to their dictionary meanings, but are merely used by the inventor to enable a clear and consistent understanding of the present disclosure. Therefore, it should be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustration purposes only and not for the purpose of limiting the present disclosure as defined in the appended claims and their equivalents.

[0039] It should be understood that the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to "a component surface" includes reference to one or more of such surfaces.

[0040] The term "include" or "may include" refers to the presence of the corresponding disclosed functions, operations or components that can be used in various embodiments of the present disclosure, rather than limiting the presence of one or more additional functions, operations or features. In addition, the term "include" or "have" may be interpreted as indicating certain characteristics, numbers, steps, operations, constituent elements, components or combinations thereof, but should not be interpreted as excluding the possibility of the presence of one or more other characteristics, numbers, steps, operations, constituent elements, components or combinations thereof.

[0041] The terms "or" and " / " used in various embodiments of the present disclosure include any of the listed terms and all combinations thereof. For example, "A or B" may include A, may include B, or may include both A and B.

[0042] Unless defined differently, all terms (including technical terms or scientific terms) used in the present disclosure have the same meanings as understood by those skilled in the art described in the present disclosure. Common terms as defined in dictionaries are interpreted as having meanings consistent with the context in the relevant technical field, and should not be interpreted ideally or overly formally unless clearly defined in the present disclosure.

[0043] Figure 1 An example wireless network 100 is shown in accordance with various embodiments of the present disclosure. Figure 1 The embodiment of the wireless network 100 shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.

[0044] Wireless network 100 includes gNodeB (gNB) 101, gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one Internet Protocol (IP) network 130, such as the Internet, a private IP network, or other data network.

[0045] Depending on the network type, other well-known terms such as "base station" or "access point" can be used instead of "gNodeB" or "gNB". For convenience, the terms "gNodeB" and "gNB" are used in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. Also, depending on the network type, other well-known terms such as "mobile station", "subscriber station", "remote terminal", "wireless terminal" or "user device" can be used instead of "user equipment" or "UE". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to a remote wireless device that wirelessly accesses a gNB, whether the UE is a mobile device (such as a mobile phone or smartphone) or a generally determined fixed device (such as a desktop computer or vending machine).

[0046] gNB 102 provides wireless broadband access to network 130 for a first plurality of user equipment (UE) within coverage area 120 of gNB 102. The first plurality of UEs include: UE 111, which may be located in a small business (SB); UE 112, which may be located in an enterprise (E); UE 113, which may be located in a WiFi hotspot (HS); UE 114, which may be located in a first residence (R); UE 115, which may be located in a second residence (R); UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop, a wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within coverage area 125 of gNB 103. The second plurality of UEs include UE 115 and UE 116. In some embodiments, one or more of gNBs 101-103 may be capable of communicating with each other and with UEs 111-116 using 5G, long term evolution (LTE), LTE-A, WiMAX, or other advanced wireless communication technologies.

[0047] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that coverage areas associated with gNBs, such as coverage areas 120 and 125, can have other shapes, including irregular shapes, depending on the configuration of the gNB and variations in the radio environment associated with natural and man-made obstacles.

[0048] As described in more detail below, one or more of gNB 101, gNB 102, and gNB 103 include a 2D antenna array as described in embodiments of the present disclosure. In some embodiments, one or more of gNB 101, gNB 102, and gNB 103 support codebook design and structure for a system with a 2D antenna array.

[0049] although Figure 1 One example of a wireless network 100 is shown, but Figure 1 Various changes may be made. For example, wireless network 100 can include any number of gNBs and any number of UEs in any suitable arrangement. Also, gNB 101 can communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 can communicate directly with network 130 and provide UEs with direct wireless broadband access to network 130. In addition, gNBs 101, 102, and / or 103 can provide access to other or additional external networks, such as an external telephone network or other type of data network.

[0050] Figure 2a and Figure 2b Example wireless transmit and receive paths according to the present disclosure are shown. In the following description, transmit path 200 can be described as being implemented in a gNB (such as gNB 102) and receive path 250 can be described as being implemented in a UE (such as UE 116). However, it should be understood that receive path 250 can be implemented in a gNB and transmit path 200 can be implemented in a UE. In some embodiments, receive path 250 is configured to support codebook design and structure for a system with a 2D antenna array as described in embodiments of the present disclosure.

[0051] The transmit path 200 includes a channel coding and modulation block 205, a serial to parallel (S to P) block 210, an N-point inverse fast Fourier transform (IFFT) block 215, a parallel to serial (P to S) block 220, an add cyclic prefix block 225, and an upconverter (UC) 230. The receive path 250 includes a downconverter (DC) 255, a remove cyclic prefix block 260, a serial to parallel (S to P) block 265, an N-point fast Fourier transform (FFT) block 270, a parallel to serial (P to S) block 275, and a channel decoding and demodulation block 280.

[0052] In the transmit path 200, the channel coding and modulation block 205 receives a set of information bits, applies coding (such as low-density parity check (LDPC) coding), and modulates the input bits (such as using quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to generate a sequence of frequency-domain modulation symbols. The serial-to-parallel (S-to-P) block 210 converts (such as demultiplexes) the serial modulation symbols into parallel data to generate N parallel symbol streams, where N is the number of IFFT / FFT points used in the gNB 102 and the UE 116. The N-point IFFT block 215 performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial block 220 converts (such as multiplexes) the parallel time-domain output symbols from the N-point IFFT block 215 to generate a serial time-domain signal. The add cyclic prefix block 225 inserts a cyclic prefix into the time-domain signal. The up-converter 230 modulates (such as up-converts) the output of the add cyclic prefix block 225 to an RF frequency for transmission via a wireless channel. The signal can also be filtered at baseband before conversion to RF frequency.

[0053] The RF signal transmitted from gNB 102 arrives at UE 116 after passing through a wireless channel, and an operation opposite to that at gNB 102 is performed at UE 116. Downconverter 255 downconverts the received signal to a baseband frequency, and remove cyclic prefix block 260 removes the cyclic prefix to generate a serial time-domain baseband signal. Serial-to-parallel block 265 converts the time-domain baseband signal into a parallel time-domain signal. N-point FFT block 270 performs an FFT algorithm to generate N parallel frequency-domain signals. Parallel-to-serial block 275 converts the parallel frequency-domain signals into a sequence of modulated data symbols. Channel decoding and demodulation block 280 demodulates and decodes the modulated symbols to recover the original input data stream.

[0054] Each of gNBs 101-103 may implement a transmit path 200 similar to that for transmitting in the downlink to UEs 111-116 and may implement a receive path 250 similar to that for receiving in the uplink from UEs 111-116. Similarly, each of UEs 111-116 may implement a transmit path 200 for transmitting in the uplink to gNBs 101-103 and may implement a receive path 250 for receiving in the downlink from gNBs 101-103.

[0055] Figure 2a and Figure 2b Each of the components in can be implemented using hardware only, or a combination of hardware and software / firmware. As a specific example, Figure 2a and Figure 2bAt least some of the components in can be implemented with software, while other components can be implemented by configurable hardware or a mixture of software and configurable hardware. For example, FFT block 270 and IFFT block 215 can be implemented as a configurable software algorithm, in which the value of the number of points N can be modified according to the implementation.

[0056] In addition, although described as using FFT and IFFT, this is illustrative only and should not be construed as limiting the scope of the present disclosure. Other types of transforms can be used, such as discrete Fourier transform (DFT) and inverse discrete Fourier transform (IDFT) functions. It should be understood that for DFT and IDFT functions, the value of variable N can be any integer (such as 1, 2, 3, 4, etc.), while for FFT and IFFT functions, the value of variable N can be any integer as a power of 2 (such as 1, 2, 4, 8, 16, etc.).

[0057] although Figure 2a and Figure 2b An example of a wireless transmit and receive path is shown, but the Figure 2a and Figure 2b Make various changes. For example, Figure 2a and Figure 2b The various components in can be combined, further subdivided or omitted, and additional components can be added according to specific needs. Figure 2a and Figure 2b It is intended to illustrate examples of the types of transmit and receive paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communications in a wireless network.

[0058] Figure 3a An example UE 116 according to the present disclosure is shown. Figure 3a The embodiment of UE 116 shown in FIG. 1 is for illustration only, and Figure 1 UEs 111-115 can have the same or similar configurations. However, UEs have a variety of configurations, and Figure 3a The scope of the present disclosure is not limited to any particular implementation of the UE.

[0059] UE 116 includes antenna 305, radio frequency (RF) transceiver 310, transmit (TX) processing circuit 315, microphone 320, and receive (RX) processing circuit 325. UE 116 also includes speaker 330, processor / controller 340, input / output (I / O) interface 345, input device(s) 350, display 355, and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0060] The RF transceiver 310 receives incoming RF signals from the antenna 305 transmitted by the gNB of the wireless network 100. The RF transceiver 310 downconverts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to the RX processing circuit 325, where the RX processing circuit 325 generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. The RX processing circuit 325 sends the processed baseband signal to the speaker 330 (such as for voice data) or to the processor / controller 340 (such as for web browsing data) for further processing.

[0061] The TX processing circuit 315 receives analog or digital voice data from the microphone 320, or receives other outgoing baseband data (such as network data, email, or interactive video game data) from the processor / controller 340. The TX processing circuit 315 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the outgoing processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal to an RF signal that is transmitted via the antenna 305.

[0062] The processor / controller 340 can include one or more processors or other processing devices and execute an OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor / controller 340 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 according to well-known principles. In some embodiments, the processor / controller 340 includes at least one microprocessor or microcontroller.

[0063] The processor / controller 340 is also capable of executing other processes and programs resident in the memory 360, such as operations for channel quality measurement and reporting for a system with a 2D antenna array as described in the embodiments of the present disclosure. The processor / controller 340 is capable of moving data into or out of the memory 360 as needed for the executed process. In some embodiments, the processor / controller 340 is configured to execute applications 362 based on the OS 361 or in response to signals received from the gNB or operator. The processor / controller 340 is also coupled to the I / O interface 345, where the I / O interface 345 provides the UE 116 with the ability to connect to other devices such as laptops and handheld computers. The I / O interface 345 is the communication path between these accessories and the processor / controller 340.

[0064] Processor / controller 340 is also coupled to input device(s) 350 and display 355. An operator of UE 116 can input data into UE 116 using input device(s) 350. Display 355 can be a liquid crystal display or other display capable of presenting text and / or at least limited graphics (such as from a website). Memory 360 is coupled to processor / controller 340. A portion of memory 360 can include random access memory (RAM), while another portion of memory 360 can include flash memory or other read-only memory (ROM).

[0065] although Figure 3a An example of UE 116 is shown, but it is possible to Figure 3a Make various changes. For example, Figure 3a The various components in can be combined, further subdivided, or omitted, and additional components can be added according to specific needs. As a specific example, processor / controller 340 can be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Moreover, although Figure 3a The UE 116 is shown configured as a mobile phone or smart phone, but the UE can be configured to operate as other types of mobile or stationary devices.

[0066] Figure 3b An example gNB 102 according to the present disclosure is shown. Figure 3b The embodiment of the gNB 102 shown in FIG. is for illustration only, and Figure 1 Other gNBs can have the same or similar configurations. However, gNBs have a variety of configurations, and Figure 3b The scope of the present disclosure is not limited to any particular implementation of the gNB. It should be noted that gNB 101 and gNB 103 can include the same or similar structure as gNB 102.

[0067] like Figure 3b As shown in FIG. 1 , gNB 102 includes multiple antennas 370a-370n, multiple RF transceivers 372a-372n, transmit (TX) processing circuitry 374, and receive (RX) processing circuitry 376. In some embodiments, one or more of the multiple antennas 370a-370n include a 2D antenna array. gNB 102 also includes a controller / processor 378, a memory 380, and a backhaul or network interface 382.

[0068] The RF transceivers 372a-372n receive incoming RF signals from the antennas 370a-370n, such as signals transmitted by a UE or other gNB. The RF transceivers 372a-372n downconvert the incoming RF signals to generate IF or baseband signals. The IF or baseband signals are sent to the RX processing circuitry 376, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. The RX processing circuitry 376 sends the processed baseband signals to the controller / processor 378 for further processing.

[0069] The TX processing circuit 374 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from the controller / processor 378. The TX processing circuit 374 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. The RF transceivers 372a-372n receive the outgoing processed baseband or IF signals from the TX processing circuit 374 and up-convert the baseband or IF signals to RF signals that are transmitted via the antennas 370a-370n.

[0070] The controller / processor 378 can include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 378 can control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceivers 372a-372n, the RX processing circuitry 376, and the TX processing circuitry 374 in accordance with well-known principles. The controller / processor 378 can also support additional functionality, such as more advanced wireless communication functionality. For example, the controller / processor 378 can perform a Blind Interference Sensing (BIS) process, such as performed through a Blind Interference Sensing (BIS) algorithm, and decode a received signal with an interference signal subtracted. The controller / processor 378 can support any of a variety of other functions in the gNB 102. In some embodiments, the controller / processor 378 includes at least one microprocessor or microcontroller.

[0071] The controller / processor 378 can also execute programs and other processes resident in the memory 380, such as a basic OS. The controller / processor 378 can also support channel quality measurement and reporting for systems with 2D antenna arrays as described in embodiments of the present disclosure. In some embodiments, the controller / processor 378 supports communications between entities such as web RTC. The controller / processor 378 can move data into or out of the memory 380 as needed by the executing process.

[0072] The controller / processor 378 is also coupled to a backhaul or network interface 382. The backhaul or network interface 382 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or via a network. The backhaul or network interface 382 can support communication via any suitable (multiple) wired or wireless connections. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G or new radio access technology or NR, LTE or LTE-A), the backhaul or network interface 382 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the backhaul or network interface 382 can allow the gNB 102 to communicate with a larger network (such as the Internet) via a wired or wireless local area network or via a wired or wireless connection. The backhaul or network interface 382 includes any suitable structure that supports communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0073] The memory 380 is coupled to the controller / processor 378. A portion of the memory 380 can include RAM, while another portion of the memory 380 can include flash memory or other ROM. In some embodiments, a plurality of instructions such as a BIS algorithm are stored in the memory. The plurality of instructions are configured to cause the controller / processor 378 to perform the BIS process and decode the received signal after subtracting at least one interference signal determined by the BIS algorithm.

[0074] As described in more detail below, the transmit and receive paths of the gNB 102 (implemented using the RF transceivers 372a-372n, the TX processing circuitry 374, and / or the RX processing circuitry 376) support aggregated communications with FDD cells and TDD cells.

[0075] although Figure 3b An example of a gNB 102 is shown, but the Figure 3b For example, gNB 102 can include any number of Figure 3a . As a specific example, an access point can include a number of backhaul or network interfaces 382, ​​and the controller / processor 378 can support routing functions to route data between different network addresses. As another specific example, while shown as including a single instance of TX processing circuitry 374 and a single instance of RX processing circuitry 376, the gNB 102 can include multiple instances of each (such as one for each RF transceiver).

[0076] Exemplary embodiments of the present disclosure are further described below in conjunction with the accompanying drawings.

[0077] When the UE needs to access the system, it can detect the SSB (Synchronization Signal Block, Synchronization Signal / PBCH Block) broadcast by the base station to achieve downlink synchronization or perform access. SSB may include PSS (Primary Synchronization Signal, Primary Synchronization Signal), SSS (Secondary Synchronization Signal) and PBCH (Physical Broadcast Channel), and PBCH may include DMRS (Demodulation Reference Signal) for PBCH demodulation.

[0078] The base station may consume excess power when it sends SSB all the time for the UE to access the system. According to the embodiments of the present disclosure, the base station does not have to send SSB all the time, but the UE only requests the base station to send SSB when it needs to access the system. At this time, the UE can send SSB request information, and the base station sends SSB in response to receiving the SSB request information.

[0079] However, after the UE sends the SSB request information, the base station may not receive the SSB request information sent by the UE. In this case, in order to meet the UE's access system requirements, the UE may resend the SSB request information. Alternatively, after the UE sends the SSB request information, although the base station receives the SSB request information and sends the SSB accordingly, the UE may not detect the SSB sent by the base station. At this time, the UE may need some time to detect the SSB sent by the base station to increase the possibility that the UE successfully detects the SSB. In this case, a suitable condition for resending the SSB request information can be determined, and the UE may resend the SSB request information if the condition for resending the SSB request information is met.

[0080] Figure 4 The method is performed by a UE according to an embodiment of the present disclosure.

[0081] In such Figure 4 In the method 400 shown, at step 401, the UE sends a first SSB request. At step 403, the UE detects the SSB and performs downlink synchronization based on the detected SSB. At step 405, if the UE does not detect the SSB, it sends a second SSB request. Figure 4 The method shown can save power for the base station and ensure that the UE can detect the SSB in time as much as possible.

[0082] According to one embodiment, for example, the SSB request of the first SSB request or the second SSB request may be an uplink reference signal, and the base station may configure the format, sequence, time-frequency resources, etc. of the uplink reference signal for the SSB request, and the UE may receive this information through signaling when it is in a connected state, or the UE may determine this information through protocol presets. In the present disclosure, signaling may be system information, high-layer signaling (Higher-Layer Signaling), media access layer signaling (MAC Layer Signaling), physical layer signaling such as downlink control information (DCI, Downlink Control Signaling), etc.

[0083] According to one embodiment, the SSB request may be sent through a random access channel, and the base station may configure a preamble (preamble code) dedicated to the SSB request and send it to the UE through signaling, and the UE sends the SSB request through the random access channel according to the obtained preamble.

[0084] According to one embodiment, the SSB request may be uplink control information (Uplink Control Information, UCI). When the UE is in a connected state, it may request a new Scell ​​(Secondary Cell) and send UCI or MAC CE (Control Element) through Pcell (Primary Cell). The UCI or MAC CE may carry 1 bit of information. For example, if the 1 bit of information is 0, it indicates an SSB request, and if it is 1, it indicates no SSB request.

[0085] According to one embodiment, within a first time interval after the UE sends a first SSB request, if the UE does not detect the SSB sent by the base station, it sends a second SSB request.

[0086] It can be understood that if SSB is not detected, the UE does not necessarily send the second SSB request immediately after the expiration of the first time interval after sending the first SSB request, but sends the second SSB request in the first available time unit for sending the SSB request after the expiration of the first time interval after sending the first SSB request. The time unit for sending the SSB request available here can be determined according to the resource scheduling method. For example, in addition to the format and sequence of the uplink reference signal used for the SSB request, the base station can also configure time-frequency resources, etc. When the UE is in a connected state, it can receive time-frequency resources through signaling, so that when SSB is not detected, the second SSB request is sent in the first available time unit after the expiration of the first time interval after sending the first SSB request.

[0087] In this way, the base station can be guaranteed to send SSB in a timely manner, and appropriate time can be left for the UE to successfully detect the SSB. Under the premise of ensuring the reception of SSB request, the resources occupied by the UE and the energy consumed in sending the request information can be saved as much as possible.

[0088] In this disclosure, "time interval", "time offset" and "time delay" are used interchangeably to mean a period of time.

[0089] In the present disclosure, the time unit is described by taking the time slot as an example, but it can be understood that the time unit is not limited to the time slot, but may include any of a time slot, a sub-time slot or a symbol (eg, an OFDM (Orthogonal Frequency Division Multiplexing) symbol).

[0090] According to one embodiment, the UE may receive signaling from the base station to obtain a first time interval between a time unit for sending a first SSB request and a time unit for sending a second SSB request, or the UE may determine the first time interval through protocol presets.

[0091] In the present disclosure, signaling may be system information, high-layer signaling, media access layer signaling, physical layer signaling such as downlink control information DCI, etc. The UE may receive the first time interval through signaling when in a connected state. During the first time interval after the time unit for sending the first SSB request, if the UE does not detect the SSB, the second SSB request is sent; on the other hand, during the first time interval after the time unit for sending the first SSB request information, if the UE detects the SSB, the second SSB request information is not sent.

[0092] For example, Figure 5 As shown, the time unit for the UE to send an SSB request (i.e., send a first SSB request) is time slot n, and the time unit for retransmitting an SSB request (i.e., sending a second SSB request) is time slot n+k. The UE may obtain the time interval k by receiving signaling (e.g., high-layer signaling, media access layer signaling, physical layer signaling, etc.) in a connected state, or determine the time interval k by protocol preset. The unit of the time interval k may be the time slot of the serving cell or bandwidth part where the UE sends the SSB request information; or, the unit of the time interval k may be the OFDM symbol of the serving cell or bandwidth part where the UE sends the SSB request information; or, the unit of the time interval k may be milliseconds or microseconds.

[0093] In this way, the time interval k between sending an SSB request and retransmitting an SSB request can be flexibly determined by the base station or through the protocol according to the situation.

[0094] According to one embodiment, after receiving the SSB request information sent by the UE, the base station may continue to periodically send SSB for a period of time, and after this period of time, the base station stops sending SSB. In this case, the first time interval can be determined based on the period of the base station sending SSBburst and the number of times the base station periodically sends SSB burst. The period of the base station sending SSB burst and the number of times the base station periodically sends SSB burst can be preset through the protocol, or can be obtained from the base station by receiving signaling (such as high-level signaling, media access layer signaling, physical layer signaling, etc.). When in a connected state, the UE can receive the period of the base station sending SSB burst and the number of times the base station periodically sends SSB burst through signaling.

[0095] According to one embodiment, the UE may receive signaling (e.g., high-layer signaling, media access layer signaling, physical layer signaling, etc.) in a connected state or determine the SSB burst transmission period of the base station and the number of times the base station periodically sends the SSB burst L through protocol presets, and may set the first time interval between the time unit for sending the SSB request (i.e., sending the first SSB request) and the time unit for retransmitting the SSB request (i.e., sending the second SSB request) to the transmission period of L SSB bursts to ensure that the UE has L opportunities for detecting the SSB, such as Figure 6 shown.

[0096] In this way, during the time interval of L SSB burst sending cycles after sending the SSB request, if the UE does not detect the SSB, the UE resends the SSB request; during the time interval of L SSB burst sending cycles after sending the SSB request, if the UE detects the SSB, the UE will not resend the SSB request.

[0097] For example, when the UE is in a connected state, it determines that the SSB burst period is 20 milliseconds (ms) by receiving signaling or protocol preset, and the UE determines that the number L is 4 by protocol preset or receiving high-level signaling. At this time, within 80 milliseconds after sending the SSB request, if the UE does not detect the SSB, the UE resends the SSB request.

[0098] In this way, the base station can be guaranteed to send SSB in a timely manner and the UE can have enough opportunities to detect the SSB.

[0099] According to one embodiment, the first time interval between the UE sending the first SSB request and sending the second SSB request may include a second time interval after sending the first SSB request and a third time interval after the second time interval. The second time interval is preset by the protocol, or the UE obtains it from the base station by receiving signaling (e.g., high-layer signaling, media access layer signaling, physical layer signaling, etc.); the third time interval may be determined based on the period of the base station sending the SSB burst and the number of times the base station periodically sends the SSB burst. The period of the base station sending the SSB burst and the number of times the base station sends the SSB burst may be preset by the protocol, or may be obtained from the base station by receiving signaling (e.g., high-layer signaling, media access layer signaling, physical layer signaling, etc.). The UE may receive the second time interval, the period of the base station sending the SSB burst, and the number of times the base station periodically sends the SSB burst through signaling when in a connected state.

[0100] According to one embodiment, the UE may start detecting the SSB after a second time interval S after the SSB request (i.e., sending the first SSB request) is sent, such as Figure 7 According to one embodiment, the second time interval S may be obtained by receiving signaling (such as high-layer signaling, media access layer signaling, physical layer signaling, etc.), or may be determined by protocol preset. The UE may receive the second time interval S through signaling when in a connected state.

[0101] According to one embodiment, after receiving the SSB request sent by the UE, the base station may continue to periodically send the SSB for a period of time, and after this period of time, the base station stops sending the SSB. At this time, the third time interval can be determined based on the period of the base station sending the SSB burst and the number of times the base station periodically sends the SSB burst. The period of the base station sending the SSB burst and the period of the base station sending the SSB can be preset through the protocol, or can be obtained from the base station by receiving signaling (such as high-level signaling, media access layer signaling, physical layer signaling, etc.). When the UE is in a connected state, it can receive the period of the base station sending the SSB burst and the number of times the base station periodically sends the SSB burst through signaling. After the UE sends the SSB request, the second time interval first passes, and then the third time interval passes. If the UE does not detect the SSB, the UE resends the SSB request information.

[0102] According to one embodiment, the second time interval may include a processing time for the base station to receive an SSB request and / or a preparation time for sending an SSB.

[0103] According to one embodiment, after the UE sends an SSB request, the base station needs a processing time t1 to receive the SSB request, and after the base station successfully receives the SSB request, it also needs a preparation time t2 for sending the SSB, and then sends the SSB. It can be understood that the UE can determine the time t1 and t2 by receiving signaling (such as high-level signaling, media access layer signaling, physical layer signaling, etc.) or by protocol preset in the connected state, and then use the time offset t=t1+t2 as the time interval S between the end of the SSB request sending and the UE starting to detect the SSB. In the present disclosure, the unit of the time offset or time interval can be a time slot, OFDM symbol, millisecond or microsecond.

[0104] Combine the following Figure 8 A specific example of a method performed by a UE according to an embodiment of the present disclosure is described.

[0105] According to one embodiment, the UE may obtain the SSB burst period of the base station by receiving signaling (e.g., high-layer signaling, media access layer signaling, physical layer signaling, etc.) in a connected state or determine the SSB burst period of the base station by protocol preset. For example, the UE determines that the SSB burst period is 20 milliseconds (ms) by receiving signaling or protocol preset.

[0106] According to one embodiment, the UE may determine the number of times L that the base station periodically sends SSBs by receiving signaling (e.g., high-layer signaling, media access layer signaling, physical layer signaling, etc.) in a connected state or by protocol preset. For example, the UE determines that the number L is 4 through protocol preset, or the UE may determine that the number L is 4 by receiving high-layer signaling.

[0107] like Figure 8 As shown in the figure, after the UE sends the SSB request (i.e., the first SSB request) in time slot n, it takes a processing time for the base station to receive the SSB request information. In addition, it also takes a preparation time for the base station to send the SSB. The processing time for the base station to receive the SSB request and the preparation time for the base station to send the SSB can be called the SSB delay S. After the UE sends the SSB request in time slot n, if the SSB is not detected after L SSB burst cycles after time slot n+S, the SSB request can be resent (i.e., the second SSB request is sent).

[0108] pass Figure 8 The method shown can timely request the base station to send SSB while ensuring the performance of UE detecting SSB.

[0109] According to an embodiment of the present disclosure, the UE may detect the SSB sent by the base station in the following manner.

[0110] According to one embodiment, the UE may measure the signal strength of a reference signal used to detect the SSB to determine whether the SSB is detected. For example, if the measured signal strength is greater than or equal to a predetermined threshold, it is determined that the SSB is detected, otherwise it is determined that the SSB is not detected.

[0111] According to one embodiment, the UE may determine whether the UE detects the SSB by the signal strength of the reference signal used to detect the SSB. For example, when the signal strength of the reference signal used to detect the SSB measured by the UE is greater than or equal to a specific threshold, it can be determined that the base station has received the SSB request information and sent the SSB.

[0112] According to one embodiment, the reference signal used by the UE to detect the SSB signal strength may be a DMRS of a PSS, SSS or PBCH. The threshold of the SSB signal strength may be obtained by receiving signaling (e.g., high-layer signaling, media access layer signaling, physical layer signaling, etc.) when the UE is in a connected state, or may be determined by protocol presets.

[0113] In this way, the UE can determine as quickly as possible whether the base station has received the SSB request information and sent the SSB accordingly.

[0114] According to one embodiment, the UE may detect the PSS and SSS in the SSB. If the physical-layer cell identity (PCI) of the serving cell is obtained through the PSS and SSS, it is determined that the SSB is detected; otherwise, it is determined that the SSB is not detected.

[0115] In this way, the UE can quickly determine whether the base station has received the SSB request information and sent the SSB accordingly, while reducing the possibility of UE misjudgment.

[0116] According to one embodiment, the UE may detect the PSS, SSS and PBCH in the SSB. If the physical layer cell identifier PCI of the serving cell is obtained through the PSS and SSS and the PBCH is successfully demodulated, it is determined that the SSB is detected; otherwise, it is determined that the SSB is not detected.

[0117] In this way, the UE can determine whether the base station has received the SSB request information and sent the SSB accordingly, while further reducing the possibility of UE misjudgment.

[0118] According to one embodiment, the UE may first measure the signal strength of a reference signal (such as PSS, SSS or DMRS of PBCH) used to detect SSB. If the measured signal strength is greater than or equal to a predetermined threshold, the PSS and SSS in the SSB are detected. If the physical-layer cell identity (PCI) of the serving cell is obtained through the PSS and SSS, it is determined that the SSB is detected; otherwise, it is determined that the SSB is not detected.

[0119] According to one embodiment, the UE may first measure the signal strength of a reference signal used to detect SSB (e.g., PSS, SSS, or DMRS of PBCH). If the measured signal strength is greater than or equal to a predetermined threshold, the PSS and SSS in the SSB are detected. If the physical-layer cell identity (PCI) of the serving cell is obtained through the PSS and SSS and the PBCH is successfully demodulated, it is determined that the SSB is detected; otherwise, it is determined that the SSB is not detected.

[0120] The above method described in the present disclosure may be executed by a UE including a transceiver and a processor. Fig. 9 900 according to the present disclosure. Fig. 9 As shown, UE 900 includes a transceiver 910 and a processor 920 coupled to the transceiver 910. The transceiver 910 is configured to send signals and receive signals. The processor 920 is configured to perform one or more operations described above in conjunction with the specific embodiments, thereby causing the UE to perform the UE execution method described in the present disclosure. For example, the processor 920 is configured to: send a first SSB request; detect an SSB; and if an SSB is not detected, send a second SSB request.

[0121] The present disclosure may also be implemented as a computer storage medium. The computer storage medium stores computer instructions. When the computer instructions are executed by the processor 920 of the UE 900, the processor 920 performs one or more operations described above in conjunction with the specific embodiments, thereby implementing the method performed by the UE described in the present disclosure.

[0122] According to an embodiment of the present disclosure, a method performed by a base station in a communication system may include: receiving a first SSB request; sending an SSB in response to receiving the first SSB request; receiving a second SSB request, wherein the second SSB request is resent when the SSB is not detected; and sending an SSB based on the second SSB request.

[0123] According to one embodiment, the method performed by the base station in the communication system may further include: sending signaling including a first time interval to the UE, wherein the non-detection of the SSB is determined based on the first time interval.

[0124] According to one embodiment, the method performed by the base station in the communication system may further include: sending a period of SSB burst to the UE and the number of times the SSB burst is periodically sent, wherein the SSB is not detected based on a first time interval determined by the period and the number of times.

[0125] According to one embodiment, the method performed by the base station in the communication system may further include: sending a second time interval, a period of the SSB burst, and the number of times the SSB burst is periodically sent to the UE, wherein the SSB is not detected based on the second time interval and a third time interval determined based on the period and the number of times.

[0126] According to one embodiment, the method performed by the base station in the communication system may further include: sending a processing time for receiving an SSB request and a preparation time for sending an SSB to a user equipment UE, wherein the second time interval is determined based on the processing time for receiving the SSB request and / or the preparation time for sending the SSB.

[0127] According to one embodiment, the base station may receive the SSB request via an uplink reference signal or uplink control information UCI or via signaling sent via a random access channel.

[0128] The above method described in the present disclosure may be performed by a base station including a transceiver and a processor. According to one embodiment, the base station may include a transceiver and a processor coupled to the transceiver. The transceiver is configured to send signals and receive signals. The processor is configured to perform one or more operations as described above in conjunction with the specific embodiments, thereby causing the base station to perform the method performed by the base station described in the present disclosure. For example, the processor is configured to: receive a first SSB request; in response to receiving the first SSB request, send an SSB; receive a second SSB request, the second SSB request being resent when the SSB is not detected; and based on the second SSB request, send an SSB.

[0129] The present disclosure may also be implemented as a computer storage medium. The computer storage medium stores computer instructions. When the computer instructions are executed by a processor of a base station, the processor performs one or more operations described above in conjunction with the specific embodiments, thereby implementing the method performed by the base station described in the present disclosure.

[0130] It can be understood that “at least one of / at least one” described in the present disclosure includes any and / or all possible combinations of the listed items, the various embodiments described in the present disclosure and the various examples in the embodiments can be changed and combined in any appropriate form, and the “ / ” described in the present disclosure means “and / or”.

[0131] The various illustrative logical blocks, modules, and circuits described in the present disclosure may be implemented or executed with a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination thereof designed to perform the functions described herein. A general purpose processor may be a microprocessor, but in an alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors cooperating with a DSP core, or any other such configuration.

[0132] The steps of the method or algorithm described in the present disclosure can be directly embodied in hardware, in a software module executed by a processor, or in a combination of the two. The software module can reside in a RAM memory, a flash memory, a ROM memory, an EPROM memory, an EEPROM memory, a register, a hard disk, a removable disk, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor so that the processor can read and write information from / to the storage medium. In an alternative, a storage medium can be integrated into a processor. The processor and the storage medium can reside in an ASIC. The ASIC can reside in a user terminal. In an alternative, the processor and the storage medium can reside in a user terminal as discrete components.

[0133] In one or more exemplary designs, the functions may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, the functions may be stored on or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include both computer storage media and communication media, the latter including any media that facilitates the transfer of a computer program from one place to another. Storage media may be any available media that can be accessed by a general or special purpose computer.

[0134] The descriptions set forth herein, in conjunction with the accompanying drawings, describe example configurations, methods, and apparatus, and do not represent all examples that may be implemented or within the scope of the claims. The term "example" as used herein means "used as an example, instance, or illustration," rather than "preferred" or "superior to other examples." The detailed description includes specific details for the purpose of providing an understanding of the described techniques. However, these techniques may be practiced without these specific details. In some cases, well-known structures and devices are shown in block diagram form to avoid obscuring the concepts of the described examples.

[0135] Although this specification contains a number of specific implementation details, these should not be interpreted as limitations on any invention or the scope of the claimed protection, but rather as descriptions of specific features of specific embodiments of specific inventions. Certain features described in this specification in the context of separate embodiments may also be implemented in combination in a single embodiment. On the contrary, the various features described in the context of a single embodiment may also be implemented separately in multiple embodiments or in any suitable sub-combination. In addition, although features may be described above as working in certain combinations, and even initially claimed as such, in some cases, one or more features from the claimed combination may be deleted from the combination, and the claimed combination may be directed to a sub-combination or a variation of the sub-combination.

[0136] It should be understood that the specific order or hierarchy of steps in the method of the present invention is an illustration of an exemplary process. Based on design preferences, it is understood that the specific order or hierarchy of steps in the method can be rearranged to achieve the functions and effects disclosed in the present invention. The attached method claims present the elements of various steps in an example order and are not meant to be limited to the specific order or hierarchy presented unless otherwise specifically stated. In addition, although elements can be described or claimed in the singular, the plural number is also contemplated unless a limitation to the singular is explicitly stated. Therefore, the present disclosure is not limited to the examples shown, and any device for performing the functions described herein is included in the various aspects of the present disclosure.

[0137] The text and drawings are provided as examples only to help readers understand the present disclosure. They are not intended and should not be interpreted as limiting the scope of the present disclosure in any way. Although certain embodiments and examples have been provided, it is obvious to those skilled in the art based on what is disclosed herein that the embodiments and examples shown may be changed without departing from the scope of the present disclosure.

Claims

1. A method performed by a user equipment UE in a communication system, comprising: Sending a first synchronization signal block SSB request; Detection of SSB; as well as If SSB is not detected, a second SSB request is sent.

2. The method of claim 1, wherein not detecting SSB comprises: The SSB is not detected within a first time interval after sending the first SSB request.

3. The method of claim 2, wherein: The first time interval is preset through a protocol, or is acquired by the UE from a base station by receiving signaling.

4. The method of claim 2, wherein: The first time interval is determined based on the period of the base station sending the SSB burst and the number of times the base station periodically sends the SSB burst. The period and the number are preset by the protocol, or are obtained by the UE from the base station by receiving signaling.

5. The method of claim 2, wherein: The first time interval includes a second time interval after sending the first SSB request and a third time interval after the second time interval, wherein the third time interval is determined based on the period of the base station sending the SSB burst and the number of times the base station periodically sends the SSB burst, and the second time interval, the period and the number are preset by the protocol, or are obtained by the UE from the base station by receiving signaling.

6. The method of claim 5, wherein: The second time interval includes the processing time of the base station receiving the SSB request and / or the preparation time for sending the SSB, and the processing time of receiving the SSB request and / or the preparation time for sending the SSB are preset by the protocol, or are obtained by the UE from the base station by receiving signaling.

7. The method of claim 1, wherein: The first SSB request or the second SSB request is an uplink reference signal or uplink control information UCI or is sent through a random access channel.

8. The method of claim 1, wherein: Detection of SSB includes: Based on the signal strength of the reference signal for detecting the SSB, it is determined whether the SSB is detected.

9. The method of claim 8, wherein: The reference signal used to detect the SSB includes one of a primary synchronization signal PSS, a secondary synchronization signal SSS, and a DMRS of a physical broadcast channel PBCH.

10. The method of claim 1, wherein: Detection of SSB includes: Detecting a primary synchronization signal PSS and a secondary synchronization signal SSS in SSB; and If the physical layer cell identifier PCI of the serving cell is obtained through the PSS and the SSS, it is determined that the SSB is detected; otherwise, it is determined that the SSB is not detected.

11. The method of claim 1, wherein: Detection of SSB includes: Detecting the primary synchronization signal PSS, the secondary synchronization signal SSS and the physical broadcast channel PBCH in the SSB; and If the physical layer cell identifier PCI of the serving cell is obtained through the PSS and the SSS and the PBCH is successfully demodulated, it is determined that the SSB is detected; otherwise, it is determined that the SSB is not detected.

12. A user equipment UE in a wireless communication system, comprising: Transceiver; as well as A processor is coupled to the transceiver and configured to execute the method according to any one of claims 1-11.

13. A method performed by a base station in a communication system, comprising: Receiving a first synchronization signal block SSB request; In response to receiving the first SSB request, sending an SSB; receiving a second SSB request, the second SSB request being resent when the SSB is not detected; as well as Based on the second SSB request, send the SSB.

14. The method of claim 13, further comprising: Sending a signaling including a first time interval to a user equipment UE, The SSB not being detected is determined based on the first time interval.

15. The method of claim 13, further comprising: The period of sending SSB bursts to the user equipment UE and the number of times the SSB bursts are periodically sent, The SSB is not detected is determined based on a first time interval determined based on the period and the number of times.

16. The method of claim 13, further comprising: Sending a second time interval, a period of the SSB burst, and the number of times the SSB burst is periodically sent to the user equipment UE, The SSB not being detected is determined based on a second time interval and a third time interval determined based on the period and the number of times.

17. The method of claim 16, further comprising: Sending the processing time of receiving the SSB request and the preparation time of sending the SSB to the user equipment UE, The second time interval is determined according to the processing time of the received SSB request and / or the preparation time of the sent SSB.

18. The method of claim 13, wherein: The base station receives the SSB request through an uplink reference signal or uplink control information UCI or signaling sent through a random access channel.

19. A base station in a wireless communication system, comprising: Transceiver; as well as A processor is coupled to the transceiver and configured to execute the method of claims 13-18.

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