Method and apparatus for SS / PBCH block indexing in unlicensed spectrum

Abstract

The present disclosure relates to a communication technology and a system thereof for fusing a 5G communication system for supporting a higher data transmission rate than a 4G system with IoT technology. The present disclosure can be applied to intelligent services based on 5G communication technology and Internet of Things related technologies, such as smart home, smart building, smart city, smart car, connected car, healthcare, digital education, smart retail, security and safety services. The present disclosure generally relates to a wireless communication system, and more specifically, the present disclosure relates to synchronization signal / physical broadcast channel (SS / PBCH) block (SSB) indexing on an unlicensed spectrum.

Description

Technical Field

[0001] The present disclosure generally relates to wireless communication systems, and more particularly, to synchronization signal / physical broadcast channel (SS / PBCH) block (SSB) indexing on unlicensed spectrum. Background Art

[0002] To meet the requirements of increasing wireless data traffic since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. 5G or pre-5G communication systems are also referred to as "beyond 4G networks" or "post-LTE systems". Therefore, 5G communication systems are considered to be implemented in higher frequency (mmWave) bands, for example, the 60 GHz band, to achieve higher data rates. 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 large antenna technologies in 5G communication systems have been discussed. In addition, in 5G communication systems, system network improvements based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), and receiver-side interference cancellation are being developed. In 5G systems, hybrid FSK and FQAM modulation as advanced coding modulation (ACM) and sliding window superposition coding (SWSC) have been developed, as well as filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA), and sparse code multiple access (SCMA) as advanced access technologies.

[0003] The Internet is a human-centric connectivity network where humans generate and consume information, and is now evolving into the Internet of Things (IoT), in which distributed entities such as things exchange and process information without human intervention. The Internet of Everything that combines IoT technology and big data processing technology through connection with cloud servers has emerged. To implement IoT, technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology", and "security technology" are required, and recently, sensor networks, machine-to-machine (M2M) communication, machine-type communication (MTC), etc. have been studied. Such an IoT environment can provide intelligent Internet technology services, creating new value for human life by collecting and analyzing data generated between connected things. Through the integration and combination of existing information technology (IT) and various industrial applications, IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services.

[0004] Accordingly, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, MTC, and M2M communication can be achieved through beamforming, MIMO, and array antennas. The application of cloud RAN as the above-mentioned big data processing technology can also be considered an example of the integration between 5G technology and IoT technology.

[0005] Wireless communication has become one of the most successful innovations in modern history. Recently, the number of subscribers to wireless communication services has exceeded 5 billion and continues to grow rapidly. Summary of the Invention

[0006]

Technical Problem

[0007] Due to the increasing popularity of smartphones and other mobile data devices (such as tablets, "notebook" computers, netbooks, e-book readers, and machine type devices) among consumers and enterprises, the demand for wireless data services is increasing rapidly. To meet the high growth of mobile data services and support new applications and deployments, improving the efficiency and coverage of radio interfaces is crucial.

[0008]

Technical Solution

[0009] The present disclosure relates to a wireless communication system, and more particularly, to performing SS / PBCH block indexing on an unlicensed spectrum.

[0010] In one embodiment, a user equipment (UE) in a wireless communication system is provided. The UE includes a transceiver configured to receive SS / PBCH blocks. The UE further includes a processor operably connected to the transceiver, the processor being configured to: determine whether shared spectrum channel access is enabled, determine a first index of an SS / PBCH block as a candidate SS / PBCH block index based on the number of candidate SS / PBCH blocks in a half-frame ( ), and determine a second index of the SS / PBCH block as the SS / PBCH block index based on quasi-co-location (QCL) parameters indicated by the PBCH in the SS / PBCH block ( ), where the SS / PBCH block index ( is determined as based on determining that shared spectrum channel access is enabled, where mod is a modulo operation; or the SS / PBCH block index ( is determined as based on determining that shared spectrum channel access is not enabled. .

[0011] In another embodiment, a base station (BS) in a wireless communication system is provided. The BS includes a processor configured to: indicate whether shared spectrum channel access is enabled, indicate a first index of an SS / PBCH block as a candidate SS / PBCH block index based on the number of candidate SS / PBCH blocks in a half-frame ( ), and indicate a second index of an SS / PBCH block as an SS / PBCH block index based on quasi-co-location (QCL) parameters indicated by a PBCH in the SS / PBCH block ( ). The BS further includes a transceiver operatively connected to the processor, the transceiver being configured to transmit an SS / PBCH block, wherein the SS / PBCH block includes a PBCH indicating the QCL parameters ( ). ).

[0012] In yet another embodiment, a method for a UE in a wireless communication system is provided. The method includes: receiving an SS / PBCH block; determining whether shared spectrum channel access is enabled, determining a first index of an SS / PBCH block as a candidate SS / PBCH block index based on the number of candidate SS / PBCH blocks in a half-frame ( ), and determining a second index of an SS / PBCH block as an SS / PBCH block index based on quasi-co-location (QCL) parameters indicated by a PBCH in the SS / PBCH block ( ), wherein the SS / PBCH block index ( is determined as based on determining that shared spectrum channel access is enabled, where mod is a modulo operation; or the SS / PBCH block index ( is determined as based on determining that shared spectrum channel access is not enabled. ).

[0013] Other technical features may be apparent to those skilled in the art in light of the accompanying drawings, description, and claims.

[0014]

Advantages of the Invention

[0015] The present disclosure provides a method and apparatus for synchronizing signal / physical broadcast channel (SS / PBCH) block (SSB) indexing on unlicensed spectrum. Description of the Drawings

[0016] To more fully understand the present disclosure and its advantages, reference is now made to the following description taken in conjunction with the accompanying drawings, in which like reference numerals represent like parts:

[0017] Figure 1Shows an exemplary wireless network according to an embodiment of the present disclosure;

[0018] Figure 2 Shows an exemplary gNB according to an embodiment of the present disclosure;

[0019] Figure 3 Shows an exemplary UE according to an embodiment of the present disclosure;

[0020] Figure 4 Shows an exemplary DL slot structure according to an embodiment of the present disclosure;

[0021] Figure 5 Shows an exemplary UL slot structure for PUSCH transmission or PUCCH transmission according to an embodiment of the present disclosure;

[0022] Figure 6 Shows exemplary multiple transmission opportunities for SS / PBCH blocks according to an embodiment of the present disclosure;

[0023] Figure 7 Shows a flowchart of a method for determining a first index set of an SS / PBCH block based on a given index from a second index set of the SS / PBCH block according to an embodiment of the present disclosure;

[0024] Figure 8 Shows a flowchart of a method for determining a second index set of an SS / PBCH block based on a given index from a first index set of the SS / PBCH block according to an embodiment of the present disclosure;

[0025] Figure 9 Shows an example of determining RLM resources based on CO according to an embodiment of the present disclosure;

[0026] Figure 10 Shows an example of determining RLM resources based on a bitmap according to an embodiment of the present disclosure;

[0027] Figure 11 Shows a flowchart of a UE process for RLM measurement for operating in a shared spectrum channel access according to an embodiment of the present disclosure; and

[0028] Figure 12 Shows a flowchart of a method for SS / PBCH block indexing on an unlicensed spectrum according to an embodiment of the present disclosure. Detailed Description

[0029] Before proceeding with the following detailed description, it may be advantageous to set forth definitions of certain words and phrases used throughout this patent document. The term "coupled" and its derivatives refer to any direct or indirect communication between two or more elements, whether or not those elements are in physical contact with each other. The terms "send," "receive," and "communicate" and their derivatives cover both direct and indirect communication. The terms "include" and "comprise" and their derivatives mean including without limitation. The term "or" is inclusive and means and / or. The phrase "associated with" and its derivatives mean including, included within, interconnected with, contains, contained within, connected to or connected with, coupled to or coupled with, communicating with, cooperating with, interlaced, juxtaposed, proximate to, bound to or bound with, having, having the properties of, having a relationship to and the like. The term "controller" refers to any device, system, or part thereof that controls at least one operation. Such a controller may be implemented in hardware or in a combination of hardware and software and / or firmware. Whether local or remote, the functions associated with any particular controller may be centralized or distributed. The phrase "at least one," when used with a list of items, means that different combinations of one or more of the listed items may be used and may include only one item in the list. For example, "at least one of A, B, and C" includes any of the following combinations: A, B, C, A and B, A and C, B and C, and A and B and C.

[0030] Additionally, the various functions described below may be implemented or supported by one or more computer programs, each formed of computer-readable program code and embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, procedures, functions, objects, classes, instances, related data, or portions thereof suitable for implementation in a suitable computer-readable program code. The phrase "computer-readable program code" includes any type of computer code, including source code, object code, and executable code. The phrase "computer-readable medium" includes any type of medium accessible by a computer, such as read-only memory (ROM), random access memory (RAM), hard disk drive, compact disc (CD), digital video disc (DVD), or any other type of memory. A "non-transitory" computer-readable medium excludes wired, wireless, optical, or other communication links that transmit transient electrical signals or other transient signals. Non-transitory computer-readable media include media that can permanently store data, as well as media that can store data and subsequently rewrite the data, such as rewritable compact discs or erasable storage devices.

[0031] Throughout the patent document, definitions of certain other words and phrases are provided. Those skilled in the art will understand that in many, if not most, instances, such definitions apply to the prior and future use of the words and phrases so defined.

[0032] The following discussion Figures 1 to 12 , and the various embodiments used in this patent document to describe the principles of the present disclosure are for illustration only and should not be construed in any way as limiting the scope of the present disclosure. Those skilled in the art will understand that the principles of the present disclosure can be implemented in any suitably arranged system or device.

[0033] The following documents are incorporated by reference into the present disclosure as if fully set forth herein: 3GPP TS 38.211 v15.4.0, "NR, Physical Channels and Modulation"; 3GPP TS 38.211 v15.4.0, "NR, Multiplex and Channel Coding"; 3GPP TS 38.213 v15.4.0, "NR, Physical Layer Procedures for Control"; 3GPP TS 38.214 v15.4.0, "NR, Physical Layer Procedures for Data"; and 3GPP TS 38.331 v15.4.0, "NR, Radio Resource Control (RRC) Protocol Specification".

[0034] The following Figures 1 to 3 describes various embodiments for implementing and using orthogonal frequency division multiplexing (OFDM) or orthogonal frequency division multiple access (OFDMA) communication techniques in a wireless communication system. Figures 1 to 3 The description does not imply any physical or architectural limitations on the implementable ways of different embodiments. Different embodiments of the present disclosure can be implemented in any suitably arranged communication system.

[0035] Figure 1 Illustrates an exemplary wireless network according to an embodiment of the present disclosure. Figure 1 The illustrated embodiment of the wireless network is for illustration only. Other embodiments of the wireless network 100 can be used without departing from the scope of the present disclosure.

[0036] As Figure 1As shown, the wireless network includes gNB 101 (e.g., base station BS), gNB 102, and gNB 103. gNB 101 communicates with gNB 102 and gNB 103. gNB 101 also communicates with at least one network 130, such as the Internet, a proprietary Internet Protocol (IP) network, or other data network.

[0037] gNB 102 provides wireless broadband access to network 130 for a first plurality of UEs within the coverage area 120 of gNB 102. The first plurality of UEs includes: UE 111, which may be located in a small business; 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); and UE 116, which may be a mobile device (M), such as a cellular phone, a wireless laptop computer, a wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within the coverage area 125 of gNB 103. The second plurality of UEs includes UE 115 and UE 116. In some embodiments, one or more of gNB 101 to gNB 103 may communicate with each other, and with UEs 111 to 116, using 5G / NR, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.

[0038] Depending on the network type, the term "base station" or "BS" may refer to any component (or set of components) configured to provide wireless access to a network, such as a transmission point (TP), a transmit-receive point (TRP), an enhanced base station (eNodeB or eNB), a 5G / NR base station (gNB), a macrocell, a femtocell, a WiFi access point (AP), or other wireless-enabled device. A base station may provide wireless access according to one or more wireless communication protocols, e.g., 5G / NR 3GPP new radio interface / access (NR), Long Term Evolution (LTE), LTE-Advanced (LTE-A), High-Speed Packet Access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For convenience, the terms "BS" and "TRP" may be used interchangeably in this patent document to indicate the network infrastructure components that provide wireless access to remote terminals. Additionally, depending on the network type, the term "user equipment" or "UE" may refer to any component, such as a "mobile station", "subscriber station", "remote terminal", "wireless terminal", "reception point", or "user equipment". For convenience, the term "user equipment" or "UE" is used in this patent document to refer to a remote wireless device that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or is generally considered a fixed device (e.g., a desktop computer or a vending machine).

[0039] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, shown as approximately circular for purposes of illustration and explanation only. It should be clearly understood that the coverage areas associated with a gNB, such as coverage areas 120 and 125, may have other shapes including irregular shapes, depending on the configuration of the gNB and variations in the radio environment related to natural and man-made obstacles.

[0040] As described in more detail below, one or more of UEs 111 to 116 include circuitry, programming, or a combination thereof for the UE. In certain embodiments, one or more of gNBs 101 to 103 include circuitry, programming, or a combination thereof for the UE.

[0041] Although Figure 1 an example of a wireless network is shown, various changes may be made to Figure 1 it. For example, the wireless network may include any suitably arranged, any number of gNBs and any number of UEs. Additionally, gNB 101 may communicate directly with any number of UEs and provide wireless broadband access to network 130 to these UEs. Similarly, each of gNBs 102 and 103 may communicate directly with network 130 and provide direct wireless broadband access to the UEs. Additionally, gNB 101, gNB 102, and / or gNB 103 may provide access to other or additional external networks such as an external telephone network or other types of data networks.

[0042] Figure 2 An exemplary gNB 102 according to an embodiment of the present disclosure is shown. Figure 2 The illustrated embodiment of gNB 102 is for illustration only, and Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs have a variety of configurations, and Figure 2 the scope of the present disclosure is not limited to any particular embodiment of the gNB.

[0043] As Figure 2 shown, gNB 102 includes a plurality of antennas 205a to 205n, a plurality of RF transceivers 210a to 210n, transmit (TX) processing circuitry 215, and receive (RX) processing circuitry 220. gNB 102 also includes a controller / processor 225, a memory 230, and a backhaul or network interface 235.

[0044] RF transceivers 210a to 210n receive input RF signals from antennas 205a to 205n, such as signals transmitted by UEs in network 100. RF transceivers 210a to 210n down-convert the input RF signals to generate IF or baseband signals. The IF or baseband signals are sent to RX processing circuitry 220, which generates processed baseband signals by filtering, decoding, and / or digitizing the baseband or IF signals. RX processing circuitry 220 sends the processed baseband signals to controller / processor 225 for further processing.

[0045] TX processing circuitry 215 receives analog or digital data (such as voice data, web data, email, or interactive video game data) from controller / processor 225. TX processing circuitry 215 encodes, multiplexes, and / or digitizes the output baseband data to generate processed baseband or IF signals. RF transceivers 210a to 210n receive the output processed baseband or IF signals from TX processing circuitry 215 and up-convert the baseband or IF signals to RF signals transmitted via antennas 205a to 205n.

[0046] Controller / processor 225 may include one or more processors or other processing devices that control the overall operation of gNB 102. For example, controller / processor 225 may control RF transceivers 210a to 210n, RX processing circuitry 220, and TX processing circuitry 215 to receive forward channel signals and transmit reverse channel signals according to well-known principles. Controller / processor 225 may also support additional functions, such as more advanced wireless communication functions. For example, controller / processor 225 may support beamforming or directional routing operations, differentially weighting outgoing signals from or incoming signals to multiple antennas 205a to 205n to efficiently direct the output signals in a desired direction. Various other functions may be supported in gNB 102 via controller / processor 225.

[0047] Controller / processor 225 is also capable of executing programs and other processing residing in memory 230, such as an OS. Controller / processor 225 may move data into or out of memory 230 as needed for performing processing.

[0048] The controller / processor 225 is also coupled to a backhaul or network interface 235. The backhaul or network interface 235 allows the gNB 102 to communicate with other devices or systems via a backhaul connection or via the network. The interface 235 may support communication via any suitable wired or wireless connection. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a system supporting 5G, LTE, or LTE-A), the interface 235 may 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 interface 235 may 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 interface 235 includes any suitable structure that supports communication via a wired or wireless connection (such as Ethernet or an RF transceiver).

[0049] The memory 230 is coupled to the controller / processor 225. A portion of the memory 230 may include RAM, and another portion of the memory 230 may include flash memory or other ROM.

[0050] Although Figure 2 an example of the gNB 102 is shown, various changes may be made to Figure 2 it. For example, the gNB 102 may include Figure 2 any number of each component shown. As a specific example, an access point may include multiple interfaces 235, and the controller / processor 225 may support a routing function for routing data between different network addresses. As another specific example, although shown as including a single example of a TX processing circuit 215 and a single example of an RX processing circuit 220, the gNB 102 may include multiple examples of TX processing circuits 215 and multiple examples of RX processing circuits 220 (such as one example per RF transceiver). Additionally, Figure 2 the various components in

[0051] Figure 3 may be combined, further subdivided, or omitted, and additional components may be added according to specific needs. Figure 3 An exemplary UE 116 according to an embodiment of the present disclosure is shown. Figure 1 The illustrated embodiment of the UE 116 is for illustrative purposes only, and Figure 3 the UEs 111 to 115 may have the same or similar configurations. However, UEs have various configurations, and

[0052] As Figure 3As shown, the UE 116 includes an antenna 305, a radio frequency (RF) transceiver 310, a TX processing circuit 315, a microphone 320, and an RX processing circuit 325. The UE 116 also includes a speaker 330, a processor 340, an input / output (I / O) interface (IF) 345, a touch screen 350, a display 355, and a memory 360. The memory 360 includes an operating system (OS) 361 and one or more applications 362.

[0053] The RF transceiver 310 receives an input RF signal transmitted by the gNB of the network 100 from the antenna 305. The RF transceiver 310 down-converts the input RF signal to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to the RX processing circuit 325, which 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 (e.g., for voice data) or the processor 340 for further processing (such as for web browsing data).

[0054] The TX processing circuit 315 receives analog or digital voice data from the microphone 320, or other output baseband data from the processor 340 (such as web data, email, or interactive video game data). The TX processing circuit 315 encodes, multiplexes, and / or digitizes the output baseband data to generate a processed baseband or IF signal. The RF transceiver 310 receives the output processed baseband or IF signal from the TX processing circuit 315 and up-converts the baseband or IF signal to an RF signal transmitted via the antenna 305.

[0055] The processor 340 may include one or more processors or other processing devices and execute the OS 361 stored in the memory 360 to control the overall operation of the UE 116. For example, the processor 340 may control the RF transceiver 310, the RX processing circuit 325, and the TX processing circuit 315 to receive forward channel signals and transmit reverse channel signals according to well-known principles. In some embodiments, the processor 340 includes at least one microprocessor or microcontroller.

[0056] The processor 340 is also capable of executing other processes and programs residing in the memory 360, such as processes for beam management. The processor 340 can move data into or out of the memory 360 as needed for executing the processes. In some embodiments, the processor 340 is configured to execute the application 362 based on the OS 361 or in response to signals received from the gNB or the operator. The processor 340 is also coupled to an I / O interface 345, which enables the UE 116 to connect to other devices, such as a laptop computer and a handheld computer. The I / O interface 345 is a communication path between these accessories and the processor 340.

[0057] The processor 340 is also coupled to a touch screen 350 and a display 355. An operator of the UE 116 can use the touch screen 350 to input data into the UE 116. The display 355 can be a liquid crystal display, a light emitting diode display, or other display capable of presenting text and / or at least limited graphics (such as from a website).

[0058] The memory 360 is coupled to the processor 340. A portion of the memory 360 may include random access memory (RAM), and another portion of the memory 360 may include flash memory or other read-only memory (ROM).

[0059] Although Figure 3 an example of the UE 116 is shown, various changes may be made to Figure 3 it. For example, Figure 3 the various components in Figure 3 may be combined, further subdivided, or omitted, and additional components may be added according to specific requirements. As a specific example, the processor 340 may be divided into multiple processors, such as one or more central processing units (CPUs) and one or more graphics processing units (GPUs). Additionally, although

[0060] the UE 116 is shown configured as a mobile phone or a smart phone, the UE may be configured to operate as other types of mobile or fixed devices.

[0061] In addition, in a 5G communication system, system network improvements based on advanced small cells, cloud radio access network (RAN), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, mobile networks, cooperative communication, coordinated multi-point (CoMP), receiver interference cancellation, etc. are being developed.

[0062] A communication system includes a downlink (DL) and an uplink (UL). The downlink (DL) refers to the transmission from a base station or one or more transmission points to a UE, and the uplink (UL) refers to the transmission from the UE to a base station or one or more receiving points. A communication system includes a downlink (DL) and an uplink (UL). The downlink (DL) transmits signals from a base station or a transmission point to a user equipment (UE), and the uplink (UL) transmits signals from the UE to a receiving point such as a NodeB.

[0063] A time unit for DL signaling or UL signaling for a cell is called a time slot and may include one or more symbols. Symbols can also be used as additional time units. A frequency (or bandwidth (BW)) unit is called a resource block (RB). One RB includes multiple subcarriers (SCs). For example, a time slot can have a duration of 0.5 milliseconds or 1 millisecond, include 14 symbols, and an RB can include 12 SCs with an SC interval of 15 KHz or 30 KHz, etc.

[0064] DL signals include data signals that transmit information content, control signals that transmit DL control information (DCI), and reference signals (RS) introduced as pilot signals. The gNB sends data information or DCI through its respective physical DL shared channel (PDSCH) or physical DL control channel (PDCCH). The PDSCH or PDCCH can be sent on a variable number of time slot symbols including one time slot symbol. For simplicity, the DCI format that schedules the PDSCH reception of a UE is called the DL DCI format, and the DCI format that schedules the transmission of the physical uplink shared channel (PUSCH) from the UE is called the UL DCI format.

[0065] The gNB sends one or more of various types of RS including channel state information RS (CSI-RS) and demodulation RS (DMRS). The CSI-RS is mainly used for the UE to perform measurements and provide channel state information (CSI) to the gNB. For channel measurements, non-zero power CSI-RS (NZP CSI-RS) resources are used. For interference measurement reports (IMR), CSI interference measurement (CSI-IM) resources associated with zero power CSI-RS (ZP CSI-RS) configurations are used. The CSI process consists of NZP CSI-RS resources and CSI-IM resources.

[0066] The UE can determine CSI-RS transmission parameters through DL control signaling from the gNB or higher layer signaling such as, for example, RRC signaling. An example of the transmission of CSI-RS can be indicated by DL control signaling or configured by higher layer signaling. The DMRS is only sent within the BW of the corresponding PDCCH or PDSCH, and the UE can use the DMRS to demodulate data or control information.

[0067] Figure 4 and Figure 5 FIG. shows an exemplary wireless transmit path and receive path in accordance with the present disclosure. In the following description, the transmit path 400 may be described as being implemented in a gNB (e.g., gNB 102), while the receive path 500 may be described as being implemented in a UE (e.g., UE 116). However, it will be understood that the receive path 500 may be implemented in the gNB and the transmit path 400 may be implemented in the UE. In some embodiments, the receive path 500 is configured to support codebook designs and structures for systems with 2D antenna arrays as described in the embodiments of the present disclosure.

[0068] As Figure 4 shown, the transmit path 400 includes a channel coding and modulation block 405, a serial-to-parallel (S-to-P) block 410, an inverse fast Fourier transform (IFFT) block 415 of size N, a parallel-to-serial (P-to-S) block 420, a cyclic prefix addition block 425, and an upconverter (UC) 430. As Figure 5 shown, the receive path 500 includes a downconverter (DC) 555, a cyclic prefix removal block 560, a serial-to-parallel (S-to-P) block 565, a fast Fourier transform (FFT) block 570 of size N, a parallel-to-serial (P-to-S) block 575, and a channel decoding and demodulation block 580.

[0069] As Figure 4 shown, the channel coding and modulation block 405 receives a set of information bits, applies coding (such as a low density parity check (LDPC) code) to the input bits and modulates (such as with quadrature phase shift keying (QPSK) or quadrature amplitude modulation (QAM)) to produce a sequence of frequency domain modulation symbols.

[0070] The serial-to-parallel block 410 converts (such as demultiplexes) the serial modulation symbols into parallel data to generate N parallel symbol streams, where N is the IFFT / FFT size used in the BS 102 and the UE 116. Then, the IFFT block 415 of size N performs an IFFT operation on the N parallel symbol streams to generate a time-domain output signal. The parallel-to-serial block 420 converts (such as multiplexes) the parallel time-domain output symbols from the IFFT block 415 of size N to generate a serial time-domain signal. The cyclic prefix addition block 425 inserts a cyclic prefix into the time-domain signal. Finally, the upconverter 430 modulates (i.e., upconverts) the output of the cyclic prefix addition block 425 to the RF frequency for transmission via the wireless channel. The signal can also be filtered at the baseband before being converted to the RF frequency.

[0071] The RF signal transmitted from the gNB 102 reaches the UE 116 after passing through the wireless channel and performs reverse operations relative to the operations at the gNB 102.

[0072] As Figure 5 shown, the downconverter 555 downconverts the received signal to the baseband frequency, and the cyclic prefix removal block 560 removes the cyclic prefix to generate a serial time-domain baseband signal. The serial-to-parallel block 565 converts the time-domain baseband signal to a parallel time-domain signal. Then, the FFT block 570 of size N performs the FFT algorithm to generate N parallel frequency-domain signals. The parallel-to-serial block 575 converts the parallel frequency-domain signals to a sequence of modulated data symbols. The channel decoding and demodulation block 580 demodulates and decodes the modulated symbols to recover the original input data stream.

[0073] Each of the gNBs 101 to 103 can implement a transmission path similar to that shown in Figure 4 for transmitting to the UEs 111 to 116 in the downlink, and can implement a reception path similar to that shown in Figure 5 for receiving from the UEs 111 to 116 in the uplink. Similarly, each of the UEs 111 to 116 can implement a transmission path corresponding to the architecture for transmitting to the gNBs 101 to 103 in the uplink, and can implement a reception path 400 for receiving from the gNBs 101 to 103 in the downlink.

[0074] Figure 4 and 5 each component in can be implemented using only hardware or using a combination of hardware and software / firmware. As a specific example, Figure 4 and Figure 5At least some of the components therein may be implemented in software, while other components are implemented by configurable hardware or a combination of software and configurable hardware. For example, the FFT block 570 and the IFFT block 515 may be implemented as configurable software algorithms, where the value of the size N can be modified according to the implementation.

[0075] In addition, although described as using FFT and IFFT, this is merely illustrative and should not be construed as limiting the scope of the present disclosure. Other types of transforms, such as the discrete Fourier transform (DFT) and the inverse discrete Fourier transform (IDFT) functions, may be used. It can be understood that for the DFT and IDFT functions, the value of the variable N can be any integer (i.e., 1, 2, 3, 4, etc.); while for the FFT and IFFT functions, the value of the N variable can be any integer that is a power of 2 (i.e., 1, 2, 4, 8, 16, etc.).

[0076] Although Figure 4 and Figure 5 show examples of a wireless transmission path and a reception path, various changes can be made to Figure 4 and Figure 5 For example, Figure 4 and Figure 5 the various components in can be combined, further subdivided, or omitted, and additional components can be added according to specific needs. In addition, Figure 4 and Figure 5 are intended to illustrate examples of the types of transmission paths and reception paths that can be used in a wireless network. Any other suitable architecture can be used to support wireless communication in a wireless network.

[0077] The present disclosure focuses on mechanisms and methods for SS / PBCH block (SSB) indexing on unlicensed spectrum, which includes two index sets, and the potential impact on SS / PBCH block indexing when using the indexing method on unlicensed spectrum.

[0078] The present disclosure focuses on SS / PBCH block indexing on unlicensed spectrum, where the unlicensed spectrum may refer to a spectrum operating in a shared channel access mode.

[0079] For operations with shared spectrum channel access, the SS / PBCH block can be associated with at least one transmission opportunity to resist the negative impact of listen-before-talk (LBT) on the channel access opportunity. Figure 6 A diagram showing multiple transmission opportunities of SS / PBCH blocks in a window is presented, where the interval (e.g., Q in the figure) between adjacent allowed candidate SS / PBCH block positions in the window can be known to the UE (e.g., through configuration or fixed assumptions, according to the application scenario), and the candidate SS / PBCH blocks with the interval Q are quasi-co-located (QCL).

[0080] Figure 6 Shows an exemplary plurality of transmission opportunities for the SS / PBCH block 600 according to an embodiment of the present disclosure. Figure 6 The embodiment of the plurality of transmission opportunities of the SS / PBCH block 600 shown in is for illustration only. Figure 6 One or more of the components shown may be implemented in a dedicated circuit configured to perform the functions, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions.

[0081] In one embodiment, two index sets for the SS / PBCH block may be supported, where the first index set represents the indices of candidate SS / PBCH blocks within a time period (e.g., a half-frame), and the window is restricted to the same maximum duration as the time period; and the second index set represents the indices of SS / PBCH blocks within a group of Q SS / PBCH blocks, where the QCL assumption is not further applicable within the group of Q SS / PBCH blocks.

[0082] In one example, the first index set (e.g., each index in this set is referred to as the "first index of the SS / PBCH block" in the present disclosure) is denoted as I_SSB1, where 0 ≤ I_SSB1 ≤ - 1, and is the maximum number of candidate SS / PBCH blocks in the time period (e.g., a half-frame). For one example, for operation with shared channel spectrum access, for a 30 kHz SCS, = 20; for a 15 kHz SCS, = 10. For another example, for operation without shared channel spectrum, , where is the maximum number of SS / PBCH blocks to be transmitted in the time period (e.g., a half-frame).

[0083] In another example, the second index set (e.g., each index in this set is referred to as the "second index of the SS / PBCH block" in the present disclosure) is denoted as I_SSB2, where 0 ≤ I_SSB1 ≤ Q - 1, and Q is a QCL assumption parameter defined in terms of the number of candidate SS / PBCH blocks. For example, the value of Q is provided to the UEs of a given cell, where the value may be indicated in the system information of the serving cell, as well as in the system information and / or RRC parameters of neighboring cells.

[0084] In one example, the first index set refers to "the index of candidate SS / PBCH blocks in a half-frame" or "the index of candidate SS / PBCH blocks per half-frame" or "the index of candidate SS / PBCH blocks" or "the candidate SS / PBCH block index", and the second index set refers to "the SS / PBCH block index" or "the index of the SS / PBCH block", or "the index of the QCL group of SS / PBCH blocks".

[0085] In one example, there is a mapping relationship between the first index of the SS / PBCH block and the second index of the SS / PBCH block.

[0086] For one example, for operations with shared channel spectrum, for a given first index I_SSB1, the corresponding second index can be determined as I_SSB2 = I_SSB1 mod Q, where Q is a QCL parameter. In a variation of this example, the corresponding second index can be determined as I_SSB2 = I_DMRS mod Q, where I_DMRS is the index of the DM-RS sequence of the PBCH in the corresponding SS / PBCH block determined by I_DMRS = I_SSB1 mod L_max, and L_max is the maximum number of SS / PBCH blocks per half-frame (e.g., for a carrier frequency range between 3 GHz and 7 GHz, L_max = 8). Note that when Q is divisible by L_max, the variation of this example gives the same I_SSBs values.

[0087] For another example, for operations without shared channel spectrum, for a given first index I_SSB1, the corresponding second index can be determined as I_SSB2 = I_SSB1, e.g., the two indices are the same.

[0088] Figure 7 A flowchart of a method 700 for determining a first index set of SS / PBCH blocks based on a given index from a second index set of SS / PBCH blocks according to an embodiment of the present disclosure is shown. Figure 7 The embodiments of the method 700 shown are for illustration only. Figure 7 One or more of the components shown may be implemented in a dedicated circuit configured to perform the functions, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions.

[0089] For yet another example, for operations with shared channel spectrum, for a given second index I_SSB2, the corresponding first index can be determined as an index set (or a subset depending on whether further information about downselection is provided), where the index set is given by I_SSB2 + k Q is given, where k comes from {0, 1, 2,...} such that I_SSB2 + k Q ≤ -1. Where Q is a QCL parameter.

[0090] For yet another example, for operations that do not require sharing the channel spectrum, for a given second index I_SSB2, the corresponding first index can be determined as I_SSB1 = I_SSB2. For example, the two indices are the same.

[0091] In one example, the index set determined for the first index of the SS / PBCH block can vary based on different values of Q and / or use cases. For example, if Q is configured for a given cell (e.g., serving cell or neighboring cell), the index set determined for the first index of the SS / PBCH block can be determined separately for that given cell. For another example, assume Q is a QCL parameter configured from the serving cell, unless there is an explicit indication of Q for a neighboring cell (e.g., neighboring cell radio resource management (RRM) measurement).

[0092] In another example, for operations with shared channel spectrum, for a given second index I_SSB2, if further information is provided to the UE, the index set determined for the first index of the SS / PBCH block can be further downselected.

[0093] In one example, the further information for downselection can be the transmission window for the SS / PBCH block of the serving cell, such that the index set for the first index corresponds to SS / PBCH blocks with candidate index I_SSB2 + k Q within the transmission window, e.g., I_SSB2 + k Q ≤ N_SSB - 1, where N_SSB corresponds to the number of candidate SS / PBCH blocks within the configured transmission window, and Q is indicated to the UE of the serving cell.

[0094] In another example, the further information for downselection can be the measurement window for the SS / PBCH block, such that the index set for the first index corresponds to candidate SS / PBCH blocks with index I_SSB2 + k Q within the measurement window, e.g., I_SSB2 + k Q ≤ N_SSB - 1, where N_SSB is the number of candidate SS / PBCH blocks within the configured measurement window, and Q is indicated to the UE of the given cell to be measured.

[0095] In yet another example, further information regarding the downselection can be an indication of channel occupancy to the UE (e.g., via a group common - physical downlink control channel (GC - PDCCH)) such that the index set for the first index corresponds to SS / PBCH blocks with candidate indices I_SSB2 + k that are restricted within the channel occupancy. with Q.

[0096] In yet another example, further information regarding the downselection can be an indication of whether a candidate SS / PBCH block is transmitted (e.g., via DCI format) such that the index set for the first index corresponds to candidate SS / PBCH blocks with index I_SSB2 + k that are indicated to be transmitted. with Q.

[0097] In yet another example, further information regarding the downselection can be an indication of whether a candidate SS / PBCH block is transmitted (e.g., via DCI format) such that the index set for the first index corresponds to candidate SS / PBCH blocks with index I_SSB2 + k for which non - transmission is not indicated. with Q.

[0098] In yet another example, when the corresponding further information regarding the downselection is provided to the UE, the index set for the first index can be determined based on a combination of the above examples.

[0099] Figure 7 An exemplary flowchart for determining a first index set of SS / PBCH blocks based on a given index from a second index set of SS / PBCH blocks is shown.

[0100] Figure 8 A flowchart of a method 800 for determining a second index set of SS / PBCH blocks based on a given index from a first index set of SS / PBCH blocks according to an embodiment of the present disclosure is shown. Figure 8 The embodiments of the method 800 shown are for illustration only. Figure 8 One or more of the components shown can be implemented in a dedicated circuit configured to perform the functions, or one or more of the components can be implemented by one or more processors executing instructions to perform the functions.

[0101] In one embodiment, the first index set for SS / PBCH blocks can be used for timing determination and corresponding signal / channel generation.

[0102] For one example, the 3 least significant bits (LSB) of the first index of an SS / PBCH block can be carried by the DM - RS sequence of the PBCH in the corresponding SS / PBCH block, where the first index of the SS / PBCH block is the candidate SS / PBCH block index.

[0103] For example, the UE may assume that the reference signal sequence for the SS / PBCH block is defined as: , where the scrambling sequence generator may be initialized at the start of each SS / PBCH block occasion with , where for (e.g., for operation with shared spectrum channel access, = 10 or 20), are the 3 LSBs of the first index of the SS / PBCH block (i.e., the candidate SS / PBCH block index), and for , is a combination of the half-frame indicator and the 2 LSBs of the first index of the SS / PBCH block (i.e., the candidate SS / PBCH block index).

[0104] For another example, when , the bits other than the 3 LSBs of the first index of the SS / PBCH block may be carried by the payload of the PBCH in the corresponding SS / PBCH block, where the first index of the SS / PBCH block is the candidate SS / PBCH block index. Table 1 shows the generation of the payload of the PBCH.

[0105] Table 1 Generation of the payload of the PBCH

[0106]

[0107] For yet another example, the PBCH scrambling sequence after rate matching and before modulation is based on the 3 LSBs of the first index of the SS / PBCH block (e.g., for operation with shared spectrum channel access, = 10 or 20), where the first index of the SS / PBCH block is the candidate SS / PBCH block index.

[0108] For example, the UE may assume that the bit block (where is the number of bits transmitted on the physical broadcast channel) is scrambled before modulation, resulting in a scrambled bit block according to , where the scrambling sequence may be initialized at the start of each SS / PBCH block with , and when (e.g., for operation with shared spectrum channel access, = 10 or 20), are the 3 LSBs of the first index of the SS / PBCH block index, and when , are the 2 LSBs of the first index of the SS / PBCH block. Wherein the first index of the SS / PBCH block is the candidate SS / PBCH block index, and the first index of the SS / PBCH block is the candidate SS / PBCH block index.

[0109] For yet another example, for operations with shared spectrum channel access, for each SS / PBCH block having a first index of the SS / PBCH block, where the first index of the SS / PBCH block is the candidate SS / PBCH block index, there may be associated time slots including Type-PDCCH monitoring opportunities.

[0110] For example, for the first index of the SS / PBCH block (i.e., the candidate SS / PBCH block index) , where (e.g., for operations with shared spectrum channel access, = 10 or 20), two consecutive time slots starting from the time slot include the associated Type0-PDCCH monitoring opportunity. The UE determines that the index of the time slot is , if , it is in the frame with the system frame number (SFN) satisfying , or if , it is in the frame with the SFN satisfying .

[0111] For yet another example, the scrambling sequence of the PBCH payload is based on the first index of the SS / PBCH block, where the first index of the SS / PBCH block is the candidate SS / PBCH block index. Table 2 shows the scrambling of the PBCH payload.

[0112] Table 2 Scrambling of the PBCH Payload

[0113]

[0114] Scrambling sequence is initialized at the start of each SFN satisfying ; and for (e.g., or ), ; for (e.g., , which can be used for operations with shared spectrum channel access), ; for (e.g., , which can be used for operations with shared spectrum channel access), ; for ; For , , where is the number of candidate SS / PBCH blocks in a half-frame.

[0115] In one embodiment, the second index set of SS / PBCH blocks can be used for processes related to QCL assumptions and / or to determine candidate SS / PBCH blocks corresponding to the second index of SS / PBCH blocks, where the candidate SS / PBCH blocks can be used to determine potential transmissions of SS / PBCH blocks to perform at least one of PDSCH resource allocation, RACH opportunity (RO) verification, PDCCH verification, or physical uplink control channel (PUCCH) verification.

[0116] For one example, the second index of SS / PBCH blocks can be used to determine resources associated with the physical random access channel (PRACH).

[0117] For one example, the PRACH opportunity is continuously mapped to the corresponding second index of each SS / PBCH block, where the second index of the SS / PBCH block can be the SS / PBCH block index. The index of the PRACH opportunity indicated by the mask index value is reset in each mapping period of consecutive PRACH opportunities of the second index of each SS / PBCH block. The UE selects the PRACH opportunity indicated by the PRACH mask index value for PRACH transmission, and the PRACH mask index value is used for the second index of the SS / PBCH block indicated in the first available mapping period.

[0118] For another example, for PRACH transmission initiated by a PDCCH command, a field in DCI format 1_0 can represent the second index of the SS / PBCH block, and this field is used to indicate the SS / PBCH block that can be used to determine the RACH opportunity for PRACH transmission, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0119] For yet another example, for PRACH transmission triggered by a higher layer, the resource index provided by ssb-ResourceList can represent the second index of the SS / PBCH block, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0120] In one example, the second index of the indicated SS / PBCH block can correspond to at least one candidate SS / PBCH block, where the first index set of the at least one candidate SS / PBCH block can be determined according to the method specified in the present disclosure. Each of the at least one candidate SS / PBCH blocks is associated with the PRACH opportunity specified in this example.

[0121] In another example, for an exemplary aspect of the method, when a first index set of at least one candidate SS / PBCH block is determined, the value of the QCL parameter (Q) can be a value configured for the serving cell.

[0122] In yet another example, a second index of the SS / PBCH block can be used to determine resources for radio link monitoring, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0123] For example, for an operation with shared spectrum channel access, when RadioLinkMonitoringRS a second index of the SS / PBCH block is provided, it is expected that the UE uses the associated SS / PBCH block to perform radio link management (RLM), where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0124] In one example, the second index of the provided SS / PBCH block can correspond to at least one candidate SS / PBCH block, where the first index set of the at least one candidate SS / PBCH block can be determined according to the method specified in this disclosure. The UE can perform RLM based on the at least one candidate SS / PBCH block.

[0125] For another example, for an operation with shared spectrum channel access, when ssb-Index a second index of the SS / PBCH block (i.e., the SS / PBCH block index) is provided to the UE, it is expected that the UE uses the SS / PBCH block and the first index (i.e., the candidate SS / PBCH block index) of the SS / PBCH block corresponding to the second index of the SS / PBCH block provided by ssb-Index in the discovery burst transmission window to perform radio link monitoring.

[0126] In another example, when a first index set of at least one candidate SS / PBCH block is determined, the value of the QCL parameter (Q) can be a value configured for the serving cell.

[0127] For yet another method, a second index of the SS / PBCH block can be used for the link recovery process, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0128] For example, for each BWP of the serving cell, the UE can be provided with a set of periodic CSI-RS resource configuration indices failureDetectionResources by and a set of periodic CSI-RS resource configuration indices candidateBeamRSList is provided by and / or a second index of the SS / PBCH block for wireless link quality measurement on the BWP of the serving cell, where the second index of the SS / PBCH block may be the SS / PBCH block index.

[0129] In one example, the second index of the SS / PBCH block may correspond to at least one candidate SS / PBCH block, where a first index set of the at least one candidate SS / PBCH block may be determined according to the method specified in the present disclosure. The UE may perform link recovery based on the at least one candidate SS / PBCH block.

[0130] In another example, when the first index set of the at least one candidate SS / PBCH block is determined, the value of the QCL parameter (Q) may be the value configured for the serving cell.

[0131] For yet another example, the second index of the SS / PBCH block may be used to index the RS for UL power control, where the second index of the SS / PBCH block may be the SS / PBCH block index.

[0132] For example, for any one of PUSCH, PUCCH, or sounding reference signal (SRS), when the value of the corresponding RS ID is mapped to the second index of the SS / PBCH block, the RS resource index set may include one or both of the second index sets of the SS / PBCH block (each index provided by ssb-Index ), where the second index of the SS / PBCH block may be the SS / PBCH block index.

[0133] In one example, the second index of the SS / PBCH block may correspond to at least one candidate SS / PBCH block, where the first index set of the at least one candidate SS / PBCH block may be determined according to the method specified in the present disclosure. The UE may perform UL power control based on the at least one candidate SS / PBCH block.

[0134] In another example, when the first index set of the at least one candidate SS / PBCH block is determined, the value of the QCL parameter (Q) may be the value configured for the serving cell.

[0135] For yet another example, the second index of the SS / PBCH block may be used to index the RS for UL spatial relation information, where the second index of the SS / PBCH block may be the SS / PBCH block index.

[0136] For example, for any one of PUSCH, PUCCH, or SRS, the RS resource index set associated with the configuration of the spatial setting for UL transmission may be the second index of the SS / PBCH block.

[0137] In one example, a second index of an SS / PBCH block may correspond to at least one candidate SS / PBCH block, wherein a first index set of the at least one candidate SS / PBCH block may be determined according to a method specified in the present disclosure. A UE may determine spatial relation information based on the at least one candidate SS / PBCH block.

[0138] In another example, when a first index set of the at least one candidate SS / PBCH block is determined, a value of a QCL parameter (Q) may be a value configured for a serving cell.

[0139] In yet another example, a second index of an SS / PBCH block may be used for beam failure recovery, wherein the second index of the SS / PBCH block may be an SS / PBCH block index.

[0140] For example, when an index of an SS / PBCH block resource is configured for beam failure recovery (e.g., BFR-SSB- Resource )), the second index of the SS / PBCH block may be used, wherein the second index of the SS / PBCH block may be an SS / PBCH block index.

[0141] In one example, a second index of an SS / PBCH block may correspond to at least one candidate SS / PBCH block, wherein a first index set of the at least one candidate SS / PBCH block may be determined according to a method specified in the present disclosure.

[0142] In another example, when a first index set of the at least one candidate SS / PBCH block is determined, a value of a QCL parameter (Q) may be a value configured for a serving cell.

[0143] In yet another example, a second index of an SS / PBCH block may be used to determine a QCL assumption using the SS / PBCH block as a source RS, wherein the second index of the SS / PBCH block may be an SS / PBCH block index.

[0144] For one example, if TCI-State the RS configured for determining the QCL assumption in is an SS / PBCH block, the second index of the SS / PBCH block may be utilized, wherein the second index of the SS / PBCH block may be an SS / PBCH block index.

[0145] For another example, if the RS configured for determining the QCL assumption for an SRS is an SS / PBCH block, the second index of the SS / PBCH block may be utilized, wherein the second index of the SS / PBCH block may be an SS / PBCH block index.

[0146] For another example, if the RS configured for CSI-RS measurement to determine the QCL assumption is an SS / PBCH block, the second index of the SS / PBCH block can be utilized, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0147] In one example, the second index of the SS / PBCH block can correspond to at least one candidate SS / PBCH block, where the first index set of the at least one candidate SS / PBCH block can be determined according to the method specified in the present disclosure.

[0148] In another example, when determining the first index set of a candidate SS / PBCH block, the value of the QCL parameter (Q) can be the value configured for the serving cell.

[0149] In yet another example, the second index of the SS / PBCH block can be used to index the RS for RRM measurement, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0150] For one example, when ssb-Index-RSRP is determined, the second index of the SS / PBCH block can be utilized, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0151] For another example, when (e.g., in ResultsPerSSB-Index ) the measurement result of the SS / PBCH block is reported, the second index of the SS / PBCH block can be utilized.

[0152] For yet another example, to determine the SS / PBCH block to be measured associated with the SSB based on the measurement timing configuration (SMTC) (e.g., ssb-ToMeasure ), the second index of the SS / PBCH block can be utilized.

[0153] In one example, the second index of the indicated SS / PBCH block can correspond to at least one candidate SS / PBCH block, where the first index set of the at least one candidate SS / PBCH block can be determined according to the method specified in the present disclosure.

[0154] For one example, the ssb-ToMeasure -bit starting from the left side of the bitmap of indicates that the second index of the SS / PBCH block (i.e., the SS / PBCH block index) is . For ssb-ToMeasureFor each second index (i.e., SS / PBCH block index) indicated by the provided SS / PBCH block, the UE can derive the set of SS / PBCH blocks within the associated SMTC window, and the first index (i.e., candidate SS / PBCH block index) of the SS / PBCH block corresponds to the second index (i.e., SS / PBCH block index) of the SS / PBCH block. The UE can perform RRM measurements based on all the sets of SS / PBCH blocks corresponding to the second indices (i.e., SS / PBCH block indices) of all the indicated SS / PBCH blocks provided by ssb-ToMeasure The UE can perform RRM measurements based on all the sets of SS / PBCH blocks corresponding to the second indices (i.e., SS / PBCH block indices) of all the indicated SS / PBCH blocks provided by

[0155] In another example, when a first index set of at least one candidate SS / PBCH block is determined, the value of the QCL parameter (Q) can be the value configured for serving cell measurements for the serving cell and can be the value configured for neighbor cell measurements for the neighbor cell.

[0156] For yet another example, the second index of the SS / PBCH block can be used to index the SS / PBCH blocks potentially transmitted in a burst, where the second index of the SS / PBCH block can be the SS / PBCH block index.

[0157] For example, the index associated with System Information Block 1 ( SIB1 ) and / or ssb-PositionsInBurst and / or ServingCellConfigCommon in ssb-PositionsInBurst can refer to the second index (i.e., SS / PBCH block index) of the SS / PBCH block, which can be further used to determine the monitoring behavior of the candidate PDCCH, and / or RO verification, and / or resource allocation of the PDSCH, and / or verification of the UL signal / channel.

[0158] In one example, the second index (i.e., SS / PBCH block index) of the SS / PBCH block can correspond to at least one candidate SS / PBCH block, where the first index set of the at least one candidate SS / PBCH block can be determined according to the method specified in the present disclosure. The UE can base the SS / PBCH blocks potentially transmitted in a burst on at least one candidate SS / PBCH block index.

[0159] For an example of this example, the - ssb-PositionsInBurst th bit starting from the left of the bitmap of indicates that the second index (i.e., SS / PBCH block index) of the SS / PBCH block is , and the UE can further derive the SS / PBCH blocks within the transmission window having the same as that indicated by ssb-PositionsInBurstThe SS / PBCH block corresponding to the first index (i.e., candidate SS / PBCH block index) of the indicated SS / PBCH block's second index (i.e., SS / PBCH block index) can potentially be transmitted.

[0160] In another example, when a set of first indices of at least one candidate SS / PBCH block is determined, the value of the QCL parameter (Q) can be the value configured for the serving cell (e.g., provided by a higher layer parameter of the serving cell).

[0161] In yet another example, for operations with shared spectrum channel access, the SS / PBCH block symbols are the symbols corresponding to the SS / PBCH blocks in the discovery burst transmission window and have a first index corresponding to the SS / PBCH block whose second index (i.e., SS / PBCH block index) is indicated to the UE by SIB1 in ssb- PositionsInBurst or by ServingCellConfigCommon in ssb-PositionsInBurst the first index (i.e., candidate SS / PBCH block index) of the SS / PBCH block.

[0162] In yet another example, for operations with shared spectrum channel access, if the UE has received SIB1 in ssb-PositionsInBurst and has not received ServingCellConfigCommon in ssb- PositionsInBurst for the serving cell, and if the UE does not monitor Type0-PDCCH CSS the candidate PDCCH in the set and at least one resource element (RE) in the candidate PDCCH overlaps with at least one RE in the SS / PBCH block within the discovery burst transmission window and the first index (i.e., candidate SS / PBCH block index) of the SS / PBCH block corresponds to the second index (i.e., SS / PBCH block index) of the SS / PBCH block provided by SIB1 in ssb-PositionsInBurst then the UE does not need to monitor the candidate PDCCH.

[0163] In yet another example, for operations with shared spectrum channel access, if the UE has received ServingCellConfigCommon in ssb-PositionsInBurst for the serving cell, and if the UE does not monitor Type0- PDCCH CSS the candidate PDCCH in the set and at least one RE of the candidate PDCCH overlaps with at least one RE of the SS / PBCH block within the discovery burst transmission window and the first index (i.e., candidate SS / PBCH block index) of the SS / PBCH block corresponds to the second index (i.e., SS / PBCH block index) of the SS / PBCH block provided by ServingCellConfigCommon in ssb-PositionsInBurstIf the second index of the SS / PBCH block provided (i.e., the SS / PBCH block index) corresponds, the UE does not need to monitor the candidate PDCCH.

[0164] In yet another example, for operations with shared spectrum channel access on a single carrier in unpaired spectrum, for the symbol set of the time slot corresponding to the SS / PBCH block within the discovery burst transmission window and the first index of the SS / PBCH block (i.e., the candidate SS / PBCH block index) is the same as that SIB1 in ssb-PositionsInBurst or is the same as that ServingCellConfigCommon in ssb-PositionsInBurst indicating the second index of the SS / PBCH block (i.e., the SS / PBCH block index) to the UE, for the reception of the SS / PBCH block, if the transmission will overlap with any symbol in the symbol set, the UE does not transmit PUSCH, PUCCH, PRACH in the time slot, and the UE does not transmit SRS in the symbol set of the time slot. When the symbol set of the time slot is provided to the UE, the UE does not expect it to be tdd-UL-DL-ConfigurationCommon or tdd-UL-DL- ConfigurationDedicated indicated as uplink.

[0165] In yet another example, for operations with shared spectrum channel access, for the symbol set of the time slot corresponding to the SS / PBCH block within the discovery burst transmission window and the first index of the SS / PBCH block (i.e., the candidate SS / PBCH block index) is the same as that SIB1 in ssb-PositionsInBurst or is the same as that ServingCellConfigCommon in ssb- PositionsInBurst indicating the second index of the SS / PBCH block (i.e., the SS / PBCH block index) to the UE, for the reception of the SS / PBCH block, the UE does not expect to detect DCI format 2_0 with an SFI index field value indicating that the symbol set of the time slot is uplink.

[0166] In yet another example, for operations with shared spectrum channel access, when receiving a PDSCH scheduled with a system information - radio network temporary identifier (SI-RNTI) and the system information indicator in the DCI is set to 1, a random access - RNTI (RA-RNTI), a paging - RNTI (P-RNTI), or a temporary cell - RNTI (TC-RNTI), the UE follows ssb- PositionsInBurstAssume a potential SS / PBCH block; and if the PDSCH resource allocation overlaps with a physical resource block (PRB) that potentially includes the SS / PBCH block transmission resource, the UE may assume that the PRB that potentially includes the SS / PBCH block transmission resource is not available for the PDSCH in the OFDM symbol in which the SS / PBCH block is potentially transmitted. The potential SS / PBCH block transmission is derived from the SS / PBCH blocks within the discovery burst transmission window, and the first index of the SS / PBCH block (i.e., the candidate SS / PBCH block index) corresponds to the second index of the SS / PBCH block (i.e., the SS / PBCH block index) indicated to the UE by ssb- PositionsInBurst The second index of the SS / PBCH block (i.e., the SS / PBCH block index) corresponds.

[0167] In yet another example, for operation with shared spectrum channel access, when receiving a PDSCH scheduled by a PDCCH with a cyclic redundancy check (CRC) scrambled by a C-RNTI, modulation and coding scheme cell-RNTI (MCS-C-RNTI), configured scheduling-RNTI (CS-RNTI), or a PDSCH with semi-persistent scheduling (SPS), the resource elements (REs) corresponding to the configured or dynamically indicated resources are not available for the PDSCH. Additionally, if the PDSCH resource allocation overlaps with a PRB that potentially includes the SS / PBCH block transmission resource, the UE may assume that the PRB that potentially includes the SS / PBCH block transmission resource is not available for the PDSCH in the OFDM symbol in which the SS / PBCH block is potentially transmitted, according to ssb-PositionsInBurst Assume a potential SS / PBCH block transmission, the UE may assume that the PRB that potentially includes the SS / PBCH block transmission resource is not available for the PDSCH in the OFDM symbol in which the SS / PBCH block is potentially transmitted. The potential SS / PBCH block transmission is derived from the SS / PBCH blocks within the discovery burst transmission window, and the first index of the SS / PBCH block (i.e., the candidate SS / PBCH block index) corresponds to the second index of the SS / PBCH block (i.e., the SS / PBCH block index) indicated to the UE by ssb-PositionsInBurst The second index of the SS / PBCH block (i.e., the SS / PBCH block index) corresponds.

[0168] This disclosure focuses on mechanisms and methods for radio link monitoring on unlicensed spectrum. Details of this disclosure include the following parts: determination of candidate RS positions for RLM; in-sync (IS) and out-of-sync (OOS) evaluation (IS / OOS evaluation) rules; and UE procedures for RLM.

[0169] This disclosure focuses on radio link monitoring on unlicensed spectrum, where the unlicensed spectrum may refer to spectrum operating in a shared channel access manner.

[0170] In one embodiment, for a serving cell, the UE may be configured with at least one index of resources for radio link monitoring (e.g., denoted as RLM-RS), and the UE may determine the resources for RLM based on the index of the resources.

[0171] In one example, for a serving cell, the UE may be configured with at least one index of RLM-RS resources (e.g., from higher layer parameters RadioLinkMonitoringRS ), where the RLM-RS resources may be, for example, SS / PBCH blocks or CSI-RS, and the UE may be configured with QCL information parameters (e.g., from the master information block (MIB), or SIBX, or higher layer parameters), then the UE may determine the resource set of RLM based on at least one index of the configured RLM-RS resources and the QCL information parameters.

[0172] For this example, represent the time domain position of one configured RLM-RS resource as i, and represent the configured QCL information parameter as Q, then the time domain position set of the resources of RLM is determined as i + Q k (where k = 0, 1,...), such that the corresponding time domain position of the RLM-RS is within the RLM measurement window.

[0173] In one example, the RLM measurement window is the same as the transmission window for discovery signals and channels (DSCH), where the DSCH includes SS / PBCH blocks and / or configurable CSI-RS.

[0174] Figure 9 An example of determining the RLM resource 900 based on CO according to an embodiment of the present disclosure is shown. Figure 9 The embodiment of the determination of the RLM resource 900 shown in is only for illustration. Figure 9 One or more of the components shown may be implemented in a dedicated circuit configured to perform the function, or one or more of the components may be implemented by one or more processors executing instructions to perform the function.

[0175] For one example, when the configured RLM-RS is an SS / PBCH block, represent the index of one SS / PBCH block configured for RLM as i_SSB, and represent the configured QCL information parameter as Q_SSB, the resource set of RLM is determined as i_SSB + Q_SSB k (where k = 0, 1,...), such that the SS / PBCH block position with index i_SSB + Q_SSB k is within the RLM measurement window. For an SS / PBCH block with a candidate position index j_SSB in the RLM measurement window, if (j_SSB mod Q_SSB) = i_SSB, the UE determines the SS / PBCH block as part of the RLM resource.

[0176] For another example, when the configured RLM-RS is CSI-RS, the index of a configured SS / PBCH block for RLM is denoted as i_CSI, and the configured QCL information parameter is denoted as Q_CSI. The set of time-domain positions of the RLM resources is determined as i_CSI + Q_CSI k, (where k = 0, 1,...), such that the corresponding time-domain position of the CSI-RS is within the RLM measurement window.

[0177] In one example, the QCL parameters of the RLM-RS resources configured as SS / PBCH blocks (Q_SSB) and the QCL parameters of the RLM-RS resources configured as CSI-RS (Q_CSI) can be configured separately.

[0178] In one example, the QCL parameters of the RLM-RS resources configured as CSI-RS (Q_CSI) can be determined based on the QCL parameters of the RLM-RS resources configured as SS / PBCH blocks (Q_SSB). For example, Q_CSI = Q_SSB / 2, in units of time slots. For further consideration, this one-to-one mapping only applies to the case where the CSI-RS and the SS / PBCH block are QCL.

[0179] In one example, if the UE is configured with channel occupancy information (CO) from the serving cell (e.g., from the GC-PDCCH), the UE can further select a lower value of k such that the time-domain position of the RLM resource with index i + Q k is within both the RLM measurement window and the CO. For example, when the configured RLM-RS is an SS / PBCH block (i.e., an SS / PBCH block with a candidate position index j_SSB in the RLM measurement window and within the CO), if (j_SSB mod Q_SSB) = i_SSB, the UE determines the SS / PBCH block as part of the RLM resource.

[0180] In one example, all symbols corresponding to the SS / PBCH block with index i_SSB + Q_SSB k are within both the RLM measurement window and the CO.

[0181] In another embodiment, all symbols of the SSS including the SS / PBCH block with index i_SSB + Q_SSB k (e.g., the third symbol in the corresponding SS / PBCH block) are within both the RLM measurement window and the CO.

[0182] Figure 10 An example of determining RLM resources 1000 based on a bitmap according to an embodiment of the present disclosure is shown. Figure 10The determined implementation of the RLM resource 1000 shown is for illustration only. Figure 10 One or more of the components shown may be implemented in a dedicated circuit configured to perform the functions, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions.

[0183] In one example, for a serving cell, the UE may use a bitmap to configure at least one index of RLM-RS resources, and then the UE may determine a resource set for RLM based on the configured bitmap.

[0184] In another example, if the UE is configured with a CO from the serving cell (e.g., from the GC-PDCCH), the UE may further select a time domain position of the RLM-RS corresponding to the bitmap downward such that the corresponding time domain position of the RLM-RS is within both the RLM measurement window and the CO.

[0185] In yet another example, when the configured RLM-RS is an SS / PBCH block, all symbols corresponding to the SS / PBCH block are within both the RLM measurement window and the CO.

[0186] In yet another example, when the configured RLM-RS is an SS / PBCH block, all symbols of the secondary synchronization signal (SSS) including the SS / PBCH block (e.g., the third symbol in the SS / PBCH block) are within both the RLM measurement window and the CO.

[0187] In one example, the RLM-RS(s) within the configured RLM measurement window are used for IS / OOS evaluation.

[0188] In one example, the UE does not expect to be configured with RLM-RS outside the RLM measurement window.

[0189] In another example, there may be RLM-RS(a) outside the configured RLM measurement window, and the RLM-RS(a) outside the configured RLM measurement window may be used for IS evaluation but not for OOS evaluation.

[0190] In yet another example, if the UE is configured with a CO from the serving cell (e.g., from the GC-PDCCH), the RLM-RS within both the configured RLM measurement window and the CO are used for IS / OOS evaluation.

[0191] In one example, the UE does not expect to be configured with RLM-RS outside the RLM measurement window or outside the configured CO.

[0192] In another example, RLM-RS(a) may exist outside the configured RLM measurement window or outside the configured CO, and the RLM-RS(a) outside the configured RLM measurement window or outside the configured CO may be used for IS evaluation but not for OOS evaluation.

[0193] In yet another example, if the UE determines more than one time-domain position of the RLM-RS resource, as detailed in this disclosure, the UE may select one of the RLM-RS resources for IS / OOS evaluation.

[0194] In one example, through the implementation of the UE, the UE may select any one of the RLM-RS resources.

[0195] In another example, the UE may select the RLM-RS resource that the UE first detects in the time domain and stop performing RLM measurements within the same RLM measurement window.

[0196] In yet another example, if the UE determines more than one time-domain position of the RLM-RS resource, as detailed in this disclosure, the UE may select more than one (e.g., including all) of the RLM-RS resources for IS / OOS evaluation.

[0197] In one example, if any one of more than one time-domain positions of the RLM-RS resource is evaluated as IS, the UE may be determined to be IS.

[0198] In another example, if all of more than one time-domain positions of the RLM-RS resource are evaluated as OOS, the UE may be determined to be OOS.

[0199] Figure 11 A flowchart of a UE process 1100 for RLM measurement for operating in a shared spectrum channel access according to an embodiment of the present disclosure is shown. Figure 11 The embodiment of the UE process 1100 shown is for illustration only. Figure 11 One or more of the components shown may be implemented in a dedicated circuit configured to perform the functions, or one or more of the components may be implemented by one or more processors executing instructions to perform the functions.

[0200] As Figure 11As shown, in step 1101, the UE first determines the QCL assumption parameter from the configuration of the serving cell; and in step 1102, the index of the RLM-RS resource is determined from the configuration of the serving cell, where the RLM-RS can be, for example, at least one of the SS / PBCH block or the CSI-RS resource. In step 1103, the UE determines the time domain position set of the RLM corresponding to the configured RLM-RS resource index, and the RLM-RS resource is within the RLM measurement window and / or the channel occupancy known to the UE. According to the present disclosure, in step 1104, the UE performs IS / OOS evaluation based on the time domain position set of the RLM, and reports the evaluation result in step 1106.

[0201] Figure 12 A flowchart of a method 1200 for indexing SS / PBCH blocks in an unlicensed spectrum according to an embodiment of the present disclosure is shown, which may be performed by a UE (eg, Figure 1 111-116 shown in ). Figure 12 The implementation of method 1200 shown in FIG. 1 is for illustration only. Figure 12 One or more components described in the drawings may be implemented in dedicated circuits configured to perform the functions described, or one or more components may be implemented by one or more processors executing instructions to perform the functions described.

[0202] like Figure 12 As shown, the method 1200 starts at step 1202. At step 1202, the UE receives a synchronization signal and physical broadcast channel (SS / PBCH) block.

[0203] Then, at step 1204, the UE determines whether shared spectrum channel access is enabled. Next, at step 1206, the UE determines the first index of the SS / PBCH block as the candidate SS / PBCH block index ( Finally, at step 1208, the UE determines the QCL parameter ( ), the second index of the SS / PBCH block is determined as the SS / PBCH block index ( ), where based on determining that shared spectrum channel access is enabled, the SS / PBCH block index ( ) was determined as . (wherein mod is a modulo operation); or based on determining that the shared spectrum channel access is not enabled, the SS / PBCH block index ( ) was determined as .

[0204] In one embodiment, Determined to be , where is the number of candidate SS / PBCH blocks in a half-frame, and is determined to be , where is the QCL parameter indicated by the PBCH included in the SS / PBCH block.

[0205] In one embodiment, the UE receives the demodulation reference signal (DMRS) of the PBCH and the scrambling sequence of the PBCH in the SS / PBCH block based on a first index determined to be the candidate SS / PBCH block index ( ), where: if , then the two least significant bits (LSBs) of the candidate SS / PBCH block index ( ) are used, and if , then the three least significant bits (LSBs) of the candidate SS / PBCH block index ( ) are used.

[0206] In one embodiment, the UE receives the payload of the PBCH in the SS / PBCH block and the number of scrambled bits in the payload of the PBCH based on a first index determined to be the candidate SS / PBCH block index ( ), where: if , , is reserved, and is the most significant bit (MSB) of the candidate SS / PBCH block index ( ), ; and if , and are the two most significant bits (MSBs) of the candidate SS / PBCH block index ( ), , where is the number of bits in the payload of the PBCH.

[0207] In one embodiment, based on determining that shared spectrum channel access is enabled, the UE performs radio link monitoring based on at least one SS / PBCH block in the discovery burst transmission window and a candidate SS / PBCH block index ( ssb-Index ) corresponding to the SS / PBCH block index ( ) indicated by a higher layer parameter ( ).

[0208] In one embodiment, based on determining that shared spectrum channel access is enabled, the UE is based on a candidate SS / PBCH block index having a correspondence with the SS / PBCH block index ( ssb-Index ) indicated by a higher layer parameter ( ) corresponding to the candidate SS / PBCH block index ( at least one SS / PBCH block of () to perform uplink power control.

[0209] In one embodiment, based on determining that shared spectrum channel access is enabled, the UE is based on having a higher layer parameter ( ssb-PositionsInBurst ), the SS / PBCH block index indicated by ), the corresponding candidate SS / PBCH block index ( ) to perform the operation of candidate PDCCH verification for at least one SS / PBCH block.

[0210] The above flowcharts illustrate exemplary methods that can be implemented in accordance with the principles of the present disclosure, and various changes can be made to the methods shown in the flowcharts herein. For example, although shown as a series of steps, the various steps in each figure can overlap, occur in parallel, can occur in a different order, or occur multiple times. In another example, some steps can be omitted or these steps can be replaced with other steps.

[0211] Although the present disclosure has been described using exemplary embodiments, various changes and modifications can be suggested to those skilled in the art. The present disclosure is intended to cover such changes and modifications that fall within the scope of the appended claims. No description in this application should be construed as implying that any particular element, step, or function is an essential element that must be included within the scope of the claims. The scope of the patent subject matter is defined only by the claims.

Claims

1. A base station in a communication system, the base station comprising: a transceiver; and a controller configured to: Sending an indication of at least one synchronization signal and a Physical Broadcast Channel (PBCH) block index to a terminal ssb- PositionsInBurst , where the PBCH block index corresponds to one or more candidate PBCH block indices; and Send to the terminal one or more SS / PBCH blocks having candidate SS / PBCH block indices corresponding to the SS / PBCH block index indicated by the ssb-PositionsInBurst SS / PBCH block in the SS / PBCH blocks, wherein the candidate SS / PBCH block index is one of the indexes of the candidate SS / PBCH blocks indexed based on the number of candidate SS / PBCH blocks in a half-frame, and Among them, for the shared spectrum channel access operation, the SS / PBCH block index is determined as I SSB2 = I SSB1 mod Q, where I SSB2 is the SS / PBCH block index, I SSB1 is the candidate SS / PBCH block index, Q is the quasi co-location QCL parameter, mod is the modulo operation, and wherein, for non-shared spectrum channel access operation, the SS / PBCH block index is the same as the candidate SS / PBCH block index.

2. The base station according to claim 1, wherein, the demodulation reference signal DMRS sequence of the PBCH in the SS / PBCH block and the scrambling sequence of the PBCH in the SS / PBCH block: when the number of candidate SS / PBCH blocks in the half-frame is equal to or greater than 8, the DMRS sequence and the scrambling sequence correspond to the three least significant bits LSB of the candidate SS / PBCH block index, and when the number of candidate SS / PBCH blocks in the half-frame is equal to 4, the DMRS sequence and the scrambling sequence correspond to the two LSBs of the candidate SS / PBCH block index.

3. The base station according to claim 1, wherein, the payload of the PBCH in the SS / PBCH block: when the number of candidate SS / PBCH blocks in the half-frame is equal to 10, the payload corresponds to the most significant bit MSB of the candidate SS / PBCH block index, when the number of candidate SS / PBCH blocks in the half-frame is equal to 20, the payload corresponds to the two MSBs of the candidate SS / PBCH block index, when the number of candidate SS / PBCH blocks in the half-frame is equal to 64, the payload corresponds to the three MSBs of the candidate SS / PBCH block index.

4. The base station according to claim 1, wherein, the PBCH payload is scrambled using a parameter M determined based on the PBCH payload size A and the number of candidate SS / PBCH blocks in the half-frame, the parameter being determined as: when the number of candidate SS / PBCH blocks in the half-frame is less than or equal to 8, M = A - 3, when the number of candidate SS / PBCH blocks in the half-frame is 20, M = A - 5, and when the number of candidate SS / PBCH blocks in the half-frame is 64, M = A - 6.

5. The base station according to claim 1, wherein, the controller is further configured to send information indicating the SS / PBCH block index for radio link monitoring RLM to the terminal, the RLM being performed using one or more SS / PBCH blocks having a candidate SS / PBCH block index corresponding to the SS / PBCH block index for RLM.

6. The base station according to claim 1, wherein, The controller is further configured to receive an uplink transmission from the terminal, which is sent by using the SS / PBCH block corresponding to the same SS / PBCH block index as a reference signal for uplink power, and wherein the uplink transmission is one of a physical uplink shared channel PUSCH, a physical uplink control channel PUCCH, and a sounding reference signal SRS.

7. The base station according to claim 1, wherein, The symbol set of the time slot corresponding to the one or more SS / PBCH blocks is not indicated as uplink by the slot format indicator SFI index field of the downlink control information DCI, and the one or more SS / PBCH blocks have candidate SS / PBCH block indices corresponding to the SS / PBCH block indices indicated by the ssb-PositionsInBurst indicated SS / PBCH block indices.

8. A terminal in a communication system, the terminal comprising: a transceiver; and a controller configured to: Receiving from a base station an indication of at least one synchronization signal and a physical broadcast channel SS / PBCH block index ssb- PositionsInBurst , where the SS / PBCH block index corresponds to one or more candidate SS / PBCH block indices; and Receive, from the base station, an SS / PBCH block in one or more SS / PBCH blocks having a candidate SS / PBCH block index corresponding to the SS / PBCH block index indicated by the ssb-PositionsInBurst and wherein the candidate SS / PBCH block index is one of the indices of the candidate SS / PBCH blocks indexed based on the number of the candidate SS / PBCH blocks in a half-frame, and Among them, for the shared spectrum channel access operation, the SS / PBCH block index is determined as I SSB2 = I SSB1 mod Q, where I SSB2 is the SS / PBCH block index, I SSB1 is the candidate SS / PBCH block index, Q is the quasi-co-location QCL parameter, mod is the modulo operation, and wherein, for non-shared spectrum channel access operation, the SS / PBCH block index is the same as the candidate SS / PBCH block index.

9. The terminal according to claim 8, wherein, the demodulation reference signal DMRS sequence of the PBCH in the SS / PBCH block and the scrambling sequence of the PBCH in the SS / PBCH block: when the number of the candidate SS / PBCH blocks in the half-frame is equal to or greater than 8, the DMRS sequence and the scrambling sequence correspond to the three least significant bits LSB of the candidate SS / PBCH block index, and when the number of the candidate SS / PBCH blocks in the half-frame is equal to 4, the DMRS sequence and the scrambling sequence correspond to the two LSBs of the candidate SS / PBCH block index; wherein the payload of the PBCH in the SS / PBCH block: when the number of the candidate SS / PBCH blocks in the half-frame is equal to 10, the payload corresponds to the most significant bit MSB of the candidate SS / PBCH block index, when the number of the candidate SS / PBCH blocks in the half-frame is equal to 20, the payload corresponds to the two MSBs of the candidate SS / PBCH block index, when the number of the candidate SS / PBCH blocks in the half-frame is equal to 64, the payload corresponds to the three MSBs of the candidate SS / PBCH block index.

10. The terminal according to claim 8, wherein, the PBCH payload is scrambled by using a parameter M determined based on the PBCH payload size A and the number of the candidate SS / PBCH blocks in the half-frame, and the parameter is determined as: when the number of the candidate SS / PBCH blocks in the half-frame is less than or equal to 8, M = A - 3, when the number of the candidate SS / PBCH blocks in the half-frame is 20, M = A - 5, and when the number of the candidate SS / PBCH blocks in the half-frame is 64, M = A - 6.

11. The terminal according to claim 8, wherein, the controller is further configured to receive information indicating an SS / PBCH block index for radio link monitoring (RLM), and the RLM is performed using one or more SS / PBCH blocks having candidate SS / PBCH block indices corresponding to the SS / PBCH block index for the RLM.

12. The terminal according to claim 8, wherein, the controller is further configured to use an SS / PBCH block corresponding to the same SS / PBCH block index as a reference signal for uplink power to transmit an uplink transmission to the base station, and wherein the uplink transmission is one of a physical uplink shared channel (PUSCH), a physical uplink control channel (PUCCH), and a sounding reference signal (SRS).

13. The terminal according to claim 8, wherein, in a case where at least one resource element (RE) for a candidate physical downlink control channel (PDCCH) overlaps with at least one RE in one or more SS / PBCH blocks having candidate SS / PBCH block indices corresponding to the SS / PBCH block index, the candidate PDCCH is not monitored by the terminal, and Among them, the symbol set of the time slot corresponding to the one or more SS / PBCH blocks is not indicated as uplink by the slot format indicator SFI index field of the downlink control information DCI, and the one or more SS / PBCH blocks have candidate SS / PBCH block indices corresponding to the SS / PBCH block indices indicated by the ssb-PositionsInBurst indicated SS / PBCH block indices.

14. A method performed by a base station in a communication system, the method comprising: Sending an indication of at least one synchronization signal and a physical broadcast channel SS / PBCH block index to a terminal ssb- PositionsInBurst , where the SS / PBCH block index corresponds to one or more candidate SS / PBCH block indices; and Send to the terminal an SS / PBCH block in one or more SS / PBCH blocks having a candidate SS / PBCH block index corresponding to the SS / PBCH block index indicated by the ssb-PositionsInBurst ​ wherein the candidate SS / PBCH block index is one of the indices of candidate SS / PBCH blocks indexed based on the number of candidate SS / PBCH blocks in a half-frame, and Among them, for the shared spectrum channel access operation, the SS / PBCH block index is determined as I SSB2 = I SSB1 mod Q, where I SSB2 is the SS / PBCH block index, I SSB1 is the candidate SS / PBCH block index, Q is the quasi-co-location QCL parameter, mod is the modulo operation, and wherein, for non-shared spectrum channel access operations, the SS / PBCH block index is the same as the candidate SS / PBCH block index.

15. A method performed by a terminal in a communication system, the method comprising: Received from the base station indicating at least one synchronization signal and the physical broadcast channel SS / PBCH block index ssb- PositionsInBurst , wherein the SS / PBCH block index corresponds to one or more candidate SS / PBCH block indices; and Receive, from the base station, an SS / PBCH block in one or more SS / PBCH blocks having a candidate SS / PBCH block index corresponding to the SS / PBCH block index indicated by the ssb-PositionsInBurst ​ wherein the candidate SS / PBCH block index is one of the indices of candidate SS / PBCH blocks indexed based on the number of candidate SS / PBCH blocks in a half-frame, and Among them, for shared spectrum channel access operations, the SS / PBCH block index is determined as I SSB2 = I SSB1 mod Q, where I SSB2 is the SS / PBCH block index, I SSB1 is the candidate SS / PBCH block index, Q is the quasi-co-location QCL parameter, mod is the modulo operation, and wherein, for non-shared spectrum channel access operations, the SS / PBCH block index is the same as the candidate SS / PBCH block index.

Images