Method and apparatus for discovery of timing configuration of signals and channels

Abstract

The present disclosure relates to a user equipment (UE) and a base station in a wireless communication system that provides support for shared spectrum channel access, wherein a method performed by a terminal in the communication system includes: determining a discovery burst transmission window starting from the first symbol of the first time slot in a half frame; receiving SS / PBCH blocks corresponding to candidate synchronization signals and physical broadcast channel SS / PBCH block indices from the base station in the discovery burst transmission window via the shared spectrum; wherein, in response to the subcarrier spacing of the SS / PBCH blocks being 15kHz, the number of candidate SS / PBCH blocks in the discovery burst transmission window is 10, wherein, in response to the subcarrier spacing of the SS / PBCH blocks being 30kHz, the number of candidate SS / PBCH blocks in the discovery burst transmission window is 20.

Description

[0001] This application is a divisional application of a patent application with an application date of December 11, 2019, application number 201980082638.5, and invention name “Method and device for discovering timing configuration of signals and channels”. Technical Field

[0002] The present application generally relates to wireless communication systems, and more particularly, to a DMRS sequence design for a PBCH that carries more timing information for discovery signals and channels in a wireless communication system. Background Art

[0003] In order to meet the needs of increased wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented with higher frequency (millimeter wave, mmWave) bands, such as 60GHz bands, to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, the development of system network improvements is being carried out based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving end interference elimination, etc. In 5G systems, hybrid FSK and QAM modulation (FQAM) and sliding window superposition coding (SWSC) have been developed as advanced coding modulation (ACM), and filter bank multi-carrier (FBMC), non-orthogonal multiple access (NOMA) and sparse code multiple access (SCMA) have been developed as advanced access technologies.

[0004] The Internet, as a human-centered connection network where humans generate and consume information, has now developed into the Internet of Things (IoT), in which distributed entities such as objects exchange and process information without human intervention. The Internet of Everything (IoE), which is a combination of IoT technology and big data processing technology through connection with a cloud server, has emerged. Since technical elements such as "sensing technology", "wired / wireless communication and network infrastructure", "service interface technology" and "security technology" are required for IoT implementation, sensor networks, machine-to-machine (M2M) communication, machine type communication (MTC), etc. have been studied recently. This IoT environment can provide intelligent Internet technology services that create new value for human life by collecting and analyzing data generated among connected objects. IoT can be applied to various fields, including smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, health care, smart appliances, and advanced medical services through aggregation and combination between existing information technology (IT) and various industrial applications.

[0005] In line with this, various attempts have been made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine type communications (MTC), and machine-to-machine (M2M) communications can be implemented through beamforming, MIMO, and array antennas. The application of a cloud radio access network (RAN) as the above-mentioned big data processing technology can also be considered as an example of the aggregation between 5G technology and IoT technology. Summary of the invention

[0006] Technical issues

[0007] The Federal Communications Commission (FCC) defines unlicensed carriers to provide no-cost public access spectrum. The use of unlicensed carriers by UEs is allowed only under the provision that the UE does not generate noticeable interference to communications in licensed carriers and does not protect communications in the unlicensed carriers from interference. For example, unlicensed carriers include industrial, scientific, and medical carriers, and unlicensed national information infrastructure carriers can be used by IEEE 802.11 devices. LTE radio access technology (RAT), also known as LTE unlicensed or LTE-U or licensed assisted access (LAA), can be deployed on unlicensed frequency spectrum.

[0008] The present disclosure relates to the design of timing information conveyed by the discovery signal and channel (DSCH) on the NR unlicensed spectrum (note that in the present disclosure, the unlicensed spectrum also includes the shared spectrum). In the present disclosure, the DSCH includes at least a set of SS / PBCH blocks, and further includes at least one of the configurable CORESET and PDSCH for RMSI, OSI or paging, or the Channel State Indicator Reference Signal (CSI-RS) (if configured), which can also be considered as an enhancement to the discovery signal in LTE for the purpose of initial cell acquisition. The term DSCH may also be referred to as other equivalent terms, such as discovery reference signal and channel, discovery block, discovery burst, discovery burst set, discovery reference signal (DRS), etc.

[0009] Technical Solution

[0010] The present disclosure relates to a pre-5G or 5G communication system to be provided with a DMRS sequence of a PBCH carrying more timing information for discovery signals and channels in an advanced communication system.

[0011] In one embodiment, a user equipment (UE) in a wireless communication system supporting shared spectrum channel access is provided. The UE includes at least one processor configured to: determine a set of discovery signal and channel (DSCH) transmission windows based on window periodicity, window duration, and window offset; determine a first set of synchronization signal and physical broadcast channel (SS / PBCH) blocks within a DSCH transmission window of the set of DSCH transmission windows, wherein the first set of SS / PBCH blocks is quasi-co-located (QCLed); and determine a second set of SS / PBCH blocks across at least two DSCH transmission windows, wherein the at least two DSCH transmission windows are different DSCH windows of the set of DSCH transmission windows, wherein the second set of SS / PBCH blocks is quasi-co-located. The UE further includes at least one transceiver operably connected to the at least one transceiver, and the at least one transceiver is configured to: receive at least one SS / PBCH block located in the first set of SS / PBCH blocks or the second set of SS / PBCH blocks from a base station (BS) via a downlink channel supporting shared spectrum channel access based on QCL information of a first set of SS / PBCH blocks or a second set of SS / PBCH blocks within a DSCH transmission window of a determined set of DSCH transmission windows.

[0012] In another embodiment, a base station (BS) in a wireless communication system supporting shared spectrum channel access is provided. The BS includes at least one transceiver configured to send a first set of SS / PBCH blocks located within at least one DSCH transmission window of a set of discovery signal and channel (DSCH) transmission windows or at least one SS / PBCH block in a second set of SS / PBCH blocks to a user equipment (UE) via a downlink channel supporting shared spectrum channel access. The BS further includes at least one processor operably connected to the at least one transceiver, the at least one processor configured to: determine a set of DSCH transmission windows based on a window periodicity, a window duration, and a window offset; determine a first set of SS / PBCH blocks within a DSCH transmission window of the set of DSCH transmission windows, wherein the first set of SS / PBCH blocks is quasi-co-located (QCLed); and determine a second set of SS / PBCH blocks across at least two DSCH transmission windows, the at least two DSCH transmission windows being different DSCH windows of the set of DSCH transmission windows, wherein the second set of SS / PBCH blocks is quasi-co-located.

[0013] In another embodiment, a method for a user equipment (UE) in a wireless communication system supporting shared spectrum channel access is provided. The method includes: determining a set of discovery signal and channel (DSCH) transmission windows based on window periodicity, window duration, and window offset; determining a first set of synchronization signal and physical broadcast channel (SS / PBCH) blocks within a DSCH transmission window of the set of DSCH transmission windows, wherein the first set of SS / PBCH blocks is quasi-co-located (QCLed); and determining a second set of SS / PBCH blocks across at least two DSCH transmission windows, the at least two DSCH transmission windows being different DSCH windows of the set of DSCH transmission windows, wherein the second set of SS / PBCH blocks is quasi-co-located; and based on QCL information of the first set of SS / PBCH blocks or the second set of SS / PBCH blocks within the DSCH transmission window of the determined set of DSCH transmission windows, receiving at least one SS / PBCH block located in the first set of SS / PBCH blocks or the second set of SS / PBCH blocks from a base station (BS) via a downlink channel supporting shared spectrum channel access.

[0014] Other technical features will be readily apparent to those skilled in the art from the following drawings, descriptions and claims.

[0015] Technical Effects

[0016] A method and apparatus for DMRS sequence design for PBCH are provided to carry more timing information for discovery signals and channels in a wireless communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] For a more complete understanding of 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:

[0018] Figure 1 illustrates an example wireless network according to an embodiment of the present disclosure;

[0019] Figure 2 illustrates an example gNB according to an embodiment of the present disclosure;

[0020] Figure 3 illustrates an example UE according to an embodiment of the present disclosure;

[0021] Figure 4 illustrates an example transmitter structure using OFDM according to an embodiment of the present disclosure;

[0022] Figure 5 illustrates an example receiver structure using OFDM according to an embodiment of the present disclosure;

[0023] Figure 6 illustrates an example encoding process for a DCI format according to an embodiment of the present disclosure;

[0024] Figure 7 illustrates an example decoding process for a DCI format for use with a UE according to an embodiment of the present disclosure;

[0025] Figure 8 An example flow chart illustrating a listen-before-talk based channel access procedure in LAA according to an embodiment of the present disclosure is shown;

[0026] Fig. 9 illustrates an example DSCH transmission timing configuration according to an embodiment of the present disclosure;

[0027] Fig.10 illustrates an example maximum DTTC window duration with a scalable number of potential SSPBSH blocks according to an embodiment of the present disclosure;

[0028] Fig.11 illustrates an example fixed number of potential SS / PBCH block locations with a scalable DTTC window duration according to an embodiment of the present disclosure;

[0029] Fig.12 illustrates an example configuration of a bitmap with filled gaps in the time domain according to an embodiment of the present disclosure;

[0030] Fig.13 illustrates an example of transmission of a DSCH based on a bitmap indicating SS / PBCH blocks actually transmitted according to an embodiment of the present disclosure allowing start; and

[0031] Fig.14 An example of a method for discovering timing configuration of a signal and a channel according to an embodiment of the present disclosure is illustrated. DETAILED DESCRIPTION

[0032] Before proceeding to the following detailed description, it may be helpful to propose definitions of certain words and phrases used throughout this patent document. The term "coupling" and its derivatives refer to any direct or indirect communication between two or more elements, whether those elements are in physical contact with each other. The terms "send", "receive" and "communication" and their derivatives include both direct and indirect communication. The terms "include" and "comprise" and their derivatives refer to unlimited inclusion. The term "or" is inclusive and refers to and / or. The phrase "associated with..." and its derivatives mean including, included in, interconnected with, included in, connected to or connected with, coupled to or coupled with, communicable with, cooperate with, intertwine, parallel, close to, joined to or joined with, have, have the characteristics of, have a relationship with, or have a relationship with, etc. The term "controller" refers to any device, system or part thereof that controls at least one operation. Such a controller can be implemented in hardware or a combination of hardware and software and / or firmware. The functions associated with any particular controller can be centralized or distributed, whether locally or remotely. The phrase "at least one of" when used with a list of items means that different combinations of one or more of the listed items may be used, and only one item in the list may be required. 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.

[0033] In addition, various functions as described below can be implemented or supported by one or more computer programs, each of which is formed by a computer-readable program code and is embodied in a computer-readable medium. The terms "application" and "program" refer to one or more computer programs, software components, instruction sets, processes, functions, objects, classes, instances, related data, or a part thereof that is suitable for being implemented with 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 that can be accessed by a computer, such as a read-only memory (ROM), a random access memory (RAM), a hard drive, a compact disk (CD), a digital video disk (DVD), or any other type of memory. "Non-volatile" computer-readable media excludes wired, wireless, optical, or other communication links that transmit instantaneous electrical signals or other signals. Non-transient computer-readable media include media in which data can be permanently stored and media in which data can be stored and rewritten afterwards, such as rewritable optical disks or erasable memory devices.

[0034] Definitions for certain other words and phrases are provided throughout this patent document. Those of skill in the art should understand that in many, if not most instances, such definitions apply to prior, as well as future uses of such defined words and phrases.

[0035] The communication system includes a downlink (DL) for transmitting signals from a transmission point such as a base station (BS) or a node B (NodeB) to a user equipment (UE) and an uplink (UL) for transmitting signals from the UE to a reception point such as a node B. The UE, also commonly referred to as a terminal or a mobile station, may be fixed or mobile and may be a cellular phone, a personal computer device, or an automation device. An eNodeB (eNB) referring to a node B in a long term evolution (LTE) communication system and a gNodeB (gNodeB) (gNB) referring to a node B in a new radio (NR) communication system may also be referred to as an access point or other equivalent terms.

[0036] The following discussion Figures 1 to 14 The various embodiments used to describe the principles of the present disclosure in this patent document are by way of illustration only and should not be interpreted 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 appropriately arranged system or device.

[0037] The following documents are hereby incorporated by reference into the present disclosure as if fully set forth herein: 3GPP TS 38.211 v15.3.0, “NR; Physical channels and modulation”; 3GPP TS 38.212 v15.3.0, “NR; Multiplexing and Channel coding”; 3GPP TS 38.213 v15.3.0, “NR; Physical Layer Procedures for Control”; 3GPP TS 38.214 v15.3.0, “NR; Physical Layer Procedures for Data”; 3GPP TS 38.215 v15.3.0, “NR; Physical Layer Measurements”; 3GPP TS 38.321 v15.2.0, “NR; Medium Access Control (MAC) protocol specification”; and 3GPP TS 38.331 v15.3.0, “NR; Radio Resource Control (RRC) Protocol Specification".

[0038] the following Figure 1-Figure 3 Various embodiments are described that are implemented in a wireless communication system and using Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) communication techniques. Figure 1-Figure 3 The description is not intended to imply physical or architectural limitations to the manner in which different embodiments may be implemented. Different embodiments of the disclosure may be implemented in any suitably arranged communications system.

[0039] Figure 1 An example wireless network is illustrated according to an embodiment of the present disclosure. Figure 1 The embodiment of the wireless network shown in FIG. 1 is for illustration only. Other embodiments of the wireless network 100 may be used without departing from the scope of the present disclosure.

[0040] like Figure 1 As shown, the wireless network includes gNB 101, 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.

[0041] gNB 102 provides wireless broadband access to network 130 for a first plurality of user equipment (UE) within coverage area 120 of gNB 102. The first plurality of UEs include UE 111, which may be located in a small business (SB), UE 112, which may be located in an enterprise (E), UE 113, which may be located in a WiFi hotspot (HS), UE 114, which may be located in a first residence (R), UE 115, which may be located in a second residence (R), and UE 116, which may be a mobile device (M) such as a cellular phone, a wireless laptop, a wireless PDA, etc. gNB 103 provides wireless broadband access to network 130 for a second plurality of UEs within coverage area 125 of gNB 103. The second plurality of UEs include UE 115 and UE 116. In some embodiments, one or more of gNBs 101-103 may communicate with each other and with UEs 111-116 using 5G, LTE, LTE-A, WiMAX, WiFi, or other wireless communication technologies.

[0042] 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 transmission-reception point (TRP), an enhanced base station (eNodeB or eNB), a 5G base station (gNB), a macro cell, a femto cell, a WiFi access point (AP), or other wirelessly enabled devices. The base station may provide wireless access according to one or more wireless communication protocols, such as 5G 3GPP new radio interface / access (NR), long term evolution (LTE), advanced LTE (LTE-A), high speed packet access (HSPA), Wi-Fi 802.11a / b / g / n / ac, etc. For the sake of convenience, the terms "BS" and "TRP" are used interchangeably in this patent document to refer to network infrastructure components that provide wireless access to remote terminals. In addition, depending on the network type, the term "user equipment" or "UE" may refer to any component such as a "mobile station", "user station", "remote terminal", "wireless terminal", "reception point" or "user device". For convenience, the terms "user equipment" and "UE" are used in this patent document to refer to remote wireless equipment that wirelessly accesses a BS, whether the UE is a mobile device (such as a mobile phone or smartphone) or a generally considered stationary device (such as a desktop computer or vending machine).

[0043] The dashed lines illustrate the approximate extents of coverage areas 120 and 125, which are shown as approximately circular for purposes of illustration and description only. It should be clearly understood that coverage areas associated with gNBs, 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 associated with natural and artificial obstructions.

[0044] As described in more detail below, one or more of UEs 111-116 include circuits, procedures, or a combination thereof for reception reliability of data and control information in an advanced wireless communication system. In certain embodiments, and one or more of gNBs 101-103 include circuits, procedures, or a combination thereof for efficient timing configuration of discovery signals and channels in an advanced wireless communication system.

[0045] Although Figure 1 The figure shows an example of a wireless network, but Figure 1 Various changes may be made. For example, the wireless network may include any number of gNBs and any number of UEs in any suitable arrangement. In addition, gNB 101 may communicate directly with any number of UEs and provide those UEs with wireless broadband access to network 130. Similarly, each gNB 102-103 may communicate directly with network 130 and provide the UEs with direct wireless broadband access to network 130. In addition, gNBs 101, 102, and / or 103 may provide access to other or additional external networks (e.g., an external telephone network or other type of data network).

[0046] Figure 2 An example gNB 102 is illustrated in accordance with an embodiment of the present disclosure. Figure 2 The embodiment of gNB 102 shown in FIG. is for illustration only, and Figure 1 gNBs 101 and 103 may have the same or similar configurations. However, gNBs may have multiple configurations, and Figure 2 The scope of this disclosure is not limited to any particular implementation of gNB.

[0047] like Figure 2 As shown, gNB 102 includes multiple antennas 205a-205n, multiple RF transceivers 210a-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.

[0048] RF transceivers 210a-210n receive incoming RF signals from antennas 205a-205n, such as signals sent by UEs in network 100. RF transceivers 210a-210n downconvert the incoming 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.

[0049] TX processing circuit system 215 receives analog or digital data (such as voice data, network data, email, or interactive video game data) from controller / processor 225. TX processing circuit system 215 encodes, multiplexes, and / or digitizes the outgoing baseband data to generate processed baseband or IF signals. RF transceivers 210a-210n receive the outgoing processed baseband or IF signals from TX processing circuit system 215 and up-convert the baseband or IF signals to RF signals that are transmitted via antennas 205a-205n.

[0050] The controller / processor 225 may include one or more processors or other processing devices that control the overall operation of the gNB 102. For example, the controller / processor 225 may control the reception of forward channel signals and the transmission of reverse channel signals through the RF transceivers 210a-210n, the RX processing circuit system 220, and the TX processing circuit system 215 in accordance with well-known principles. The controller / processor 225 may also support additional functionality, such as more advanced wireless communication functionality. For example, the controller / processor 225 may support beamforming or directional routing operations in which transmitted signals from multiple antennas 205a-205n are weighted differently to effectively direct the transmitted signals in a desired direction. A wide variety of other functions may be supported by the controller / processor 225 in the gNB 102.

[0051] Controller / processor 225 is also capable of executing programs and other processes, such as an OS, resident in memory 230. Controller / processor 225 may move data into or out of memory 230 as needed by executing a process.

[0052] 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 a network. The interface 235 can support communication via one or more any suitable wired or wireless connections. For example, when the gNB 102 is implemented as part of a cellular communication system (such as a cellular communication system supporting 5G, LTE, or LTE-A), the interface 235 can allow the gNB 102 to communicate with other gNBs via a wired or wireless backhaul connection. When the gNB 102 is implemented as an access point, the interface 235 can allow the gNB 102 to communicate via a wired or wireless local area network or via a wired or wireless connection to a larger network (such as the Internet). The interface 235 includes any suitable structure that supports communication via a wired or wireless connection, such as an Ethernet or RF transceiver.

[0053] Memory 230 is coupled to controller / processor 225. A portion of memory 230 may include RAM, and another portion of memory 230 may include flash memory 230 or other ROM.

[0054] Although Figure 2 An example of gNB 102 is shown, but the Figure 2 For example, gNB 102 may include any number of Figure 2 As a specific example, the access point may include multiple interfaces 235, and the controller / processor 225 may support routing functions to route data between different network addresses. As another specific example, although shown as including a single instance of the TX processing circuit system 215 and a single instance of the RX processing circuit system 220, the gNB 102 may include multiple instances of each (such as one for each RF transceiver). In addition, Figure 2 The various components in may be combined, further subdivided, or omitted, and additional components may be added according to specific needs.

[0055] Figure 3 An example UE 116 is illustrated according to an embodiment of the present disclosure. Figure 3 The embodiment of UE 116 shown in FIG. 1 is for illustration only, and Figure 1 UEs 111-115 may have the same or similar configurations. However, UEs have a wide variety of configurations, and Figure 3 The scope of the present disclosure is not limited to any particular implementation of a UE.

[0056] like Figure 3As shown, UE 116 includes antenna 305, radio frequency (RF) transceiver 310, TX processing circuit system 315, microphone 320 and receive (RX) processing circuit system 325. UE 116 also includes speaker 330, processor 340, input / output (I / O) interface (IF) 345, touch screen 350, display 355 and memory 360. Memory 360 includes operating system (OS) 361 and one or more applications 362.

[0057] RF transceiver 310 receives incoming RF signals from antenna 305 transmitted by a gNB of network 100. RF transceiver 310 downconverts the incoming RF signals to generate an intermediate frequency (IF) or baseband signal. The IF or baseband signal is sent to RX processing circuitry 325, which generates a processed baseband signal by filtering, decoding and / or digitizing the baseband or IF signal. RX processing circuitry 325 sends the processed baseband signal to speaker 330 (e.g., for voice data) or to processor 340 for further processing (e.g., for web browsing data).

[0058] TX processing circuit system 315 receives analog or digital voice data from microphone 320 or other outgoing baseband data (such as network data, email or interactive video game data) from processor 340. TX processing circuit system 315 encodes, multiplexes and / or digitizes the outgoing baseband data to generate a processed baseband or IF signal. RF transceiver 310 receives the outgoing processed baseband or IF signal from TX processing circuit system 315 and up-converts the baseband or IF signal to an RF signal that is transmitted via antenna 305.

[0059] Processor 340 may include one or more processors or other processing devices and execute OS 361 stored in memory 360 to control the overall operation of UE 116. For example, processor 340 may control the reception of forward channel signals and the transmission of reverse channel signals through RF transceiver 310, RX processing circuit system 325, and TX processing circuit system 315 according to well-known principles. In some embodiments, processor 340 includes at least one microprocessor or microcontroller.

[0060] The processor 340 is also capable of executing other processes and programs resident 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 by 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 a signal received from the gNB or operator. The processor 340 is also coupled to the I / O interface 345, which provides the UE 116 with the ability to connect to other devices such as laptops and handheld computers. The I / O interface 345 is the communication path between these accessories and the processor 340.

[0061] Processor 340 is also coupled to touch screen 350 and display unit 355. An operator of UE 116 may use touch screen 350 to enter data into UE 116. Display 355 may be a liquid crystal display, light emitting diode display, or other display capable of presenting text and / or at least limited graphics, such as from a website.

[0062] Memory 360 is coupled to processor 340. A portion of memory 360 may include random access memory (RAM), and another portion of memory 360 may include flash memory or other read-only memory (ROM).

[0063] Although Figure 3 An example of UE 116 is shown, but the Figure 3 Make various changes. For example, Figure 3 The various components in the embodiment may be combined, further subdivided, or omitted, and additional components may be added as required. As a specific example, 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). Figure 3 The illustrated UE 116 is configured as a mobile phone or smart phone, but the UE may be configured to operate as other types of mobile or stationary devices.

[0064] The present disclosure relates generally to wireless communication systems, and more particularly to reducing power consumption of a user equipment (UE) communicating with a base station and transmission of a UE to a physical downlink control channel (PDCCH) and reception of the UE from the PDCCH for operation with dual connectivity. The communication system includes a downlink (DL) referring to transmissions from a base station or one or more transmission points to a UE and an uplink (UL) referring to transmissions from a UE to a base station or to one or more receiving stations.

[0065] In order to meet the needs of increased wireless data services since the deployment of 4G communication systems, efforts have been made to develop improved 5G or pre-5G communication systems. Therefore, 5G or pre-5G communication systems are also referred to as "super 4G networks" or "post-LTE systems". 5G communication systems are considered to be implemented with higher frequency (millimeter wave, mmWave) bands, such as 60GHz bands, to achieve higher data rates. In order to reduce the propagation loss of radio waves and increase the transmission distance, beamforming, massive multiple input multiple output (MIMO), full-dimensional MIMO (FD-MIMO), array antennas, analog beamforming, and massive antenna technology are discussed in 5G communication systems. In addition, in 5G communication systems, the development of system network improvements is being carried out based on advanced small cells, cloud radio access networks (RAN), ultra-dense networks, device-to-device (D2D) communications, wireless backhaul, mobile networks, cooperative communications, coordinated multi-point (CoMP), receiving end interference elimination, etc.

[0066] The time unit for DL ​​signaling or for UL signaling on a cell is called a time slot and may include one or more symbols. A symbol may also be used as an additional time unit. A frequency (or bandwidth (BW)) unit is called a resource block (RB). An RB includes multiple subcarriers (SCs). For example, a time slot may include 14 symbols, have a duration of 1 millisecond or 0.5 milliseconds, and an RB may have a BW of 180kHz or 360kHz and include 12 SCs, where the spacing between SCs is 15kHz or 30kHz, respectively.

[0067] DL signals include data signals that transmit information content, control signals that transmit DL control information (DCI) formats, and reference signals (RS) also known as pilot signals. The gNB can send data information (e.g., transport blocks) or DCI formats through the corresponding physical DL shared channel (PDSCH) or physical DL control channel (PDCCH). The gNB can send one or more of multiple types of RS, including channel state information RS (CSI-RS) and demodulation RS (DMRS). CSI-RS is intended for UEs to measure channel state information (CSI) or perform other measurements, such as measurements related to mobility support. DMRS can be sent only in the BW of the corresponding PDCCH or PDSCH, and the UE can use DMRS to demodulate data or control information.

[0068] The UL signal also includes a data signal that transmits information content, a control signal that transmits UL control information (UCI), and an RS. The UE sends data information (e.g., transport block) or UCI through the corresponding physical UL shared channel (PUSCH) or physical UL control channel (PUCCH). When the UE sends data information and UCI at the same time, the UE can multiplex both in the PUSCH or send them separately in the corresponding PUSCH and PUCCH. UCI includes hybrid automatic repeat request acknowledgement (HARQ-ACK) information indicating the UE's correct or incorrect detection of a data transport block (TB), a scheduling request (SR) indicating whether the UE has data in the UE's buffer, and a CSI report that enables the gNB to select appropriate parameters to perform link adaptation for PDSCH or PDCCH transmission to the UE.

[0069] The CSI report from the UE may include a channel quality indicator (CQI) that informs the gNB of the modulation and coding scheme (MCS) of the UE to detect data TBs with a predetermined block error rate (BLER) (such as 10% BLER), a precoding matrix indicator (PMI) that tells the gNB how to precode the signaling to the UE, and a rank indicator (RI) that indicates the transmission rank of the PDSCH. The UL RS includes DMRS and sounding RS (SRS). DMRS is only transmitted in the BW of the corresponding PUSCH or PUCCH transmission. The gNB can use DMRS to demodulate the information in the corresponding PUSCH or PUCCH. SRS is sent by the UE to provide UL CSI to the gNB, and for TDD or flexible duplex systems, PMI for DL ​​transmission is also provided. UL DMRS or SRS transmissions can be based on, for example, Zadoff-Chu (ZC) sequences or, in general, CAZAC sequences.

[0070] DL and UL transmissions may be based on an Orthogonal Frequency Division Multiplexing (OFDM) waveform including a variation using DFT precoding known as DFT-spread OFDM.

[0071] Figure 4 An example transmitter structure 400 using OFDM is illustrated according to an embodiment of the present disclosure. Figure 4 The illustrated embodiment of transmitter structure 400 is for illustration only. Figure 4 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0072] The information bits, such as DCI bits or data bits 410, are encoded by an encoder 420, rate matched to the allocated time / frequency resources by a rate matcher 430, and modulated by a modulator 440. Subsequently, the modulated coded symbols and DMRS or CSI-RS 450 are mapped to an SC 460 by an SC mapping unit 465, an inverse fast Fourier transform (IFFT) is performed by a filter 470, a cyclic prefix (CP) is added by a CP insertion unit 480, and the resulting signal is filtered by a filter 490 and transmitted by a radio frequency (RF) unit 495.

[0073] Figure 5 An example receiver structure 500 using OFDM is illustrated according to an embodiment of the present disclosure. Figure 5 The embodiment of receiver structure 500 shown in FIG. 5 is for illustration only. Figure 5 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0074] The received signal 510 is filtered by a filter 520, a CP removal unit removes the CP 530, a filter 540 applies a fast Fourier transform (FFT), an SC demapping unit 550 demaps the SC selected by a BW selection unit 555, the received symbols are demodulated by a channel estimator and demodulator unit 560, a rate dematcher 570 restores rate matching, and a decoder 580 decodes the resulting bits to provide information bits 590.

[0075] The UE typically monitors multiple candidate positions for corresponding potential PDCCH transmissions to decode multiple candidate DCI formats in a time slot. Monitoring PDCCH candidates refers to receiving and decoding PDCCH candidates according to the DCI format that the UE is configured to receive. The DCI format includes a cyclic redundancy check (CRC) bit so that the UE confirms the correct detection of the DCI format. The DCI format type is identified by a radio network temporary identifier (RNTI) of the scrambled CRC bit. For a DCI format scheduled to a PDSCH or PUSCH of a single UE, the RNTI can be a cell RNTI (C-RNTI) and is used as a UE identifier.

[0076] For a DCI format that schedules a PDSCH that transmits system information (SI), the RNTI may be an SI-RNTI. For a DCI format that schedules a PDSCH that provides a random access response (RAR), the RNTI may be an RA-RNTI. For a DCI format that schedules a PDSCH or PUSCH to a single UE before the UE establishes a radio resource control (RRC) connection with the serving gNB, the RNTI may be a temporary C-RNTI (TC-RNTI). For a DCI format that provides TPC commands to a group of UEs, the RNTI may be a TPC-PUSCH-RNTI or a TPC-PUCCH-RNTI. Each RNTI type may be configured for the UE via higher layer signaling such as RRC signaling. A DCI format that schedules PDSCH transmissions to a UE is also referred to as a DL DCI format or DL ​​allocation, while a DCI format that schedules PUSCH transmissions from a UE is also referred to as a UL DCI format or UL grant.

[0077] The PDCCH transmission may be within a set of physical RBs (PRBs). The gNB may configure the UE with one or more sets of PRBs, also referred to as control resource sets, for PDCCH reception. The PDCCH transmission may be in a control channel element (CCE) included in the control resource set. The UE determines the CCE for PDCCH reception based on a search space, such as a UE-specific search space (USS) for PDCCH candidates using a DCI format with a CRC scrambled by an RNTI (such as a C-RNTI), and a common search space for PDCCH candidates using a DCI format with a CRC scrambled by other RNTIs, the UE-specific search space being configured to the UE by UE-specific RRC signaling for scheduling PDSCH reception or PUSCH transmission. The set of CCEs that may be used for PDCCH transmission to the UE defines the PDCCH candidate locations. The nature of the control resource set is a transmission configuration indication (TCI) state that provides quasi-co-location information of the DMRS antenna ports for PDCCH reception.

[0078] Figure 6 An example encoding process 600 for a DCI format is illustrated according to an embodiment of the present disclosure. Figure 6 The illustrated embodiment of encoding process 600 is for illustration only. Figure 6 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0079] The gNB encodes and transmits each DCI format separately in the corresponding PDCCH. The RNTI masks the CRC of the DCI format codeword to enable the UE to identify the DCI format. For example, the CRC and RNTI may include 16 bits or 24 bits, for example. The CRC of the (non-encoded) DCI format bits 610 is determined using a CRC calculation unit 620, and the CRC is masked using an exclusive OR (XOR) operation unit 630 between the CRC bits and the RNTI bits 640. The XOR operation is defined as XOR(0,0)=0, XOR(0,1)=1, XOR(1,0)=1, XOR(1,1)=0. The masked CRC bits are appended to the DCI format information bits using a CRC append unit 650. The encoder 660 performs channel coding (such as tail-biting convolutional coding or polar coding), followed by rate matching of the allocated resources by a rate matcher 670. The interleaving and modulation unit 680 applies interleaving and modulation, such as QPSK, and transmits an output control signal 690.

[0080] Figure 7 An example decoding process 700 of a DCI format for use with a UE according to an embodiment of the present disclosure is illustrated. Figure 7 The illustrated embodiment of decoding process 700 is for illustration only. Figure 7 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0081] The received control signal 710 is demodulated and deinterleaved by a demodulator and deinterleaver 720. The rate matching applied at the gNB transmitter is recovered by a rate matcher 730 and the resulting bits are decoded by a decoder 740. After decoding, a CRC extractor 750 extracts the CRC bits and provides DCI format information bits 760. The DCI format information bits are demasked 770 by an XOR operation with the RNTI 780 (when applicable) and a CRC check is performed by unit 790. When the CRC check succeeds (checksum is zero), the DCI format information bits are considered valid. When the CRC check fails, the DCI format information bits are considered invalid.

[0082] For LTE initial access, the primary and secondary synchronization signals (PSS and SSS, respectively) are used for coarse timing and frequency synchronization and cell identity (ID) acquisition. Because the PSS / SSS is sent twice every 10ms, considering the system frame number (SFN) introduced radio frame and time domain enumeration, the frame timing is detected from the PSS / SSS to avoid the need to increase the detection burden from the physical broadcast channel (PBCH). In addition, the cyclic prefix (CP) length and (if unknown) duplex scheme can be detected from the PSS / SSS. The PSS is constructed from a frequency domain ZC sequence of length 63, where the middle elements are discarded to avoid the use of dc subcarriers. Three roots are selected for the PSS to represent the three physical layer identifiers within each group of cells.

[0083] The SSS sequence is based on a maximum length sequence (also called an M sequence). Each SSS sequence is constructed by interleaving two BPSK modulated sequences in the frequency domain of length 31, where the two source sequences before modulation are different cyclic shifts of the same M sequence. The cyclic shift index is constructed from the physical cell ID group.

[0084] Because PSS / SSS detection may be faulty (e.g., due to non-ideal auto-correlation and cross-correlation properties of PSS / SSS and lack of CRC protection), the cell ID hypothesis detected from PSS / SSS can occasionally be confirmed via PBCH detection. PBCH is mainly used to signal the master information block (MIB) consisting of DL and UL system bandwidth information (3 bits), PHICH information (3 bits) and SFN (8 bits). Adding 10 reserved bits (for other uses such as MTC), the MIB payload totals 24 bits. After appending a 16-bit CRC, rate 1 / 3 tail-biting convolutional coding, 4x repetition and QPSK modulation are applied to the 40-bit codeword. The resulting QPSK symbol stream is sent across 4 subframes spread over 4 radio frames. Unlike detecting the MIB, blind detection of the number of CRS ports is also required for PBCH.

[0085] For NR licensed spectrum, each synchronization and PBCH signal block (SS / PBCH block) includes one symbol for PSS, two symbols for PBCH, and one symbol for SSS and PBCH, where the four symbols are continuously mapped and time-division multiplexed. SS is designed uniformly for all supported carrier frequency ranges in NR, including PSS and SSS sequence design. The transmission bandwidth of PSS and SSS (e.g., 12 RBs) is smaller than the transmission bandwidth of the entire SS / PBCH block (e.g., 20 RBs). For initial cell selection of NR cells, the UE assumes a default SS burst set periodicity of 20 milliseconds, and in order to detect non-standalone NR cells, the network provides the UE with one SS burst set periodicity information per frequency carrier, and if possible, information to derive measurement timing / duration.

[0086] Different from MIB, the remaining minimum system information (RMSI) is carried by the physical downlink shared channel (PDSCH), and the scheduling information is carried by the corresponding physical downlink control channel (PDCCH). A similar structure is applied to other system information (OSI) and paging messages. The control resource set (CORESET) used to receive common control channels (such as RMSI) is configured with the content of PBCH.

[0087] The Federal Communications Commission (FCC) defines unlicensed carriers to provide no-cost public access spectrum. The use of unlicensed carriers by UEs is allowed only under the provision that the UE does not generate noticeable interference to communications in licensed carriers and does not protect communications in the unlicensed carriers from interference. For example, unlicensed carriers include industrial, scientific, and medical carriers, and unlicensed national information infrastructure carriers can be used by IEEE 802.11 devices. LTE radio access technology (RAT), also known as LTE unlicensed or LTE-U or licensed assisted access (LAA), can be deployed on unlicensed frequency spectrum.

[0088] Figure 8 An example flow chart of a listen-before-talk 800 based channel access procedure in LAA according to an embodiment of the present disclosure is illustrated. Figure 8 The illustrated embodiment of listen-before-talk 800 is for illustration only. Figure 8 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0089] In an LTE system, after sensing that the channel is idle during the time slot duration of the delay duration (812); and after the backoff counter (BO) is zero in step 4 (814), the eNB may send a transmission including a physical downlink shared channel (PDSCH), or a physical downlink control channel (PDCCH), or an enhanced physical downlink control channel (EPDCCH) on the carrier on which the LAA secondary cell (Scell) transmission is performed. An example of this channel access process is Figure 8 (For example, for this type of channel access procedure it is also called Cat4 LBT).

[0090] The backoff counter is adjusted by sensing the channel additional time slot duration according to the following steps: (1) setting the counter to a random number uniformly distributed between 0 and the collision window (CW) value (821), and proceeding to step (4); (2) if the counter is greater than 0 and the eNB chooses to decrement the counter, then reducing the counter by 1 (822); (3) sensing the channel additional time slot duration, and if the additional time slot duration is idle, proceeding to step (4); otherwise, proceeding to step (5); (4) if the counter is 0, stop; otherwise, proceed to step (2); (5) sensing the channel until a busy time slot is detected within the additional delay duration or all time slots of the additional delay duration are detected as idle; and (6) if the channel is sensed as idle during all time slot durations of the additional delay duration, proceeding to step (4); otherwise, proceeding to step (5).

[0091] In addition, for each of the supported channel access priority classes, the eNB maintains a contention window value and adjusts it before setting the backoff counter. The adjustment of the contention window value is based on the HARQ-ACK / NACK value corresponding to the PDSCH transmission in a reference subframe, where the reference subframe is the start of the most recent transmission on the carrier made by the eNB for which at least some HARQ-ACK / NACK feedback is expected to be available.

[0092] In addition, in an LTE system, the eNB may send a transmission including a discovery signal but not including a PDSCH on a carrier on which an LAA Scell ​​transmission is performed immediately after the channel is sensed to be idle for a sensing interval of at least 25 microseconds and if the duration of the transmission is less than 1 millisecond. For this type of channel access procedure, this is also referred to as Cat2 LBT.

[0093] The present disclosure focuses on the design of timing information conveyed by the discovery signal and channel (DSCH) on the NR unlicensed spectrum (note that in the present disclosure, the unlicensed spectrum also includes the shared spectrum). In the present disclosure, the DSCH includes at least a set of SS / PBCH blocks, and further includes at least one of the configurable CORESET and PDSCH for RMSI, OSI or paging, or the Channel State Indicator Reference Signal (CSI-RS), which, if configured, can also be considered as an enhancement to the discovery signal in LTE for the purpose of initial cell acquisition. The term DSCH may also be referred to as other equivalent terms, such as discovery reference signal and channel, discovery block, discovery burst, discovery burst set, discovery reference signal (DRS), etc.

[0094] Fig. 9 An example DSCH transmission timing configuration 900 is illustrated according to an embodiment of the present disclosure. Fig. 9The illustrated embodiment of the DSCH transmission timing configuration 900 is for illustration only. Fig. 9 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0095] In one embodiment, the timing configuration for the DSCH transmission window is denoted in the present disclosure as DTTC, where DTTC includes configuration of at least one of a window periodicity (e.g., P_DTTC), a window duration (e.g., D_DTTC), or a window offset within a periodicity (e.g., O_DTTC). In one example, the gNB may send DSCH within the DTTC window, subject to LBT, and the UE expects to receive DSCH within the DTTC window based on DTTC (e.g., with a duration of D_DSCH). Fig. 9 A diagram showing this embodiment is shown.

[0096] In one example, the DTTC window periodicity is configurable, and the candidate configurable value is the same as the periodicity for the SS / PBCH blocks included in the DTTC window, for example, a value from the set {5, 10, 20, 40, 80, 160} milliseconds. For one example, the DTTC window periodicity can be the same as the periodicity of the SS / PBCH blocks, and no additional explicit configuration is required (e.g., the UE assumes that the DTTC window periodicity is configured by the higher layer parameter ssb-PeriodicityServingCell in the RMSI). For this example, the UE assumes that all SS / PBCH blocks are sent in the DTTC window, and no SS / PBCH blocks are sent outside the DTTC window.

[0097] In another example, the DTTC window periodicity is configurable, and the candidate configurable value is at least 20 milliseconds, for example, a value taken from the set {20, 40, 80, 160} milliseconds. For one example, the DTTC window periodicity can be the same as the periodicity of the SS / PBCH block, and no additional explicit configuration is required (for example, the UE assumes that the DTTC window periodicity is configured by the higher-layer parameter ssb-PeriodicityServingCell in the RMSI). For this example, the UE assumes that all SS / PBCH blocks are sent in the DTTC window, and no SS / PBCH blocks are sent outside the DTTC window.

[0098] In another example, the configuration of the DTTC window periodicity is the same as the configured periodicity of the SS / PBCH blocks (e.g., using the same higher layer parameter ssb-PeriodicityServingCell in RMSI and no new configuration field is required), and the UE assumes that all SS / PBCH blocks are sent within the DTTC window and no SS / PBCH blocks are sent outside the DTTC window.

[0099] In yet another example, the configuration of the DTTC window periodicity is configured separately from the periodicity of the configuration of the SS / PBCH blocks (e.g., requiring a new configuration field). Based on the configuration of DTTC and the periodicity of the SS / PBCH blocks, there may be SS / PBCH blocks sent outside of DTTC. In one example, the configuration of the DTTC window periodicity is indicated in system information (e.g., RMSI).

[0100] In yet another example, one of the DTTCs is predefined and assumed by the UE for initial access purposes, eg, a 20 ms window periodicity with a predefined window offset of 0 ms and a predefined window duration of 5 ms.

[0101] In yet another example, if the DTTC window periodicity in DTTC is configured as P_DTTC milliseconds, and the transmission duration of the DSCH within the window is determined to be at most D_DSCH milliseconds, then when the combination of P_DTTC and D_DSCH meets a predefined condition, a one-shout LBT (e.g., Cat2 LBT) may be used for the transmission of the DSCH, e.g., the ratio of D_DSCH to P_DSCH is less than or equal to a predefined threshold (e.g., 5%).

[0102] Table 1 or a subset of Table 1 may be example combinations of DTTC periodicity and DSCH duration using Cat2 LBT for a predefined threshold of 5%.

[0103] Table 1 shows an example of a combination of DTTC periodicity and DSCH duration using Cat2 LBT.

[0104]

Table 1

[0105]

[0106] In yet another example, the window duration in DTTC may not exceed the measurement interval for the specific frequency layer, eg, 6 milliseconds.

[0107] In yet another example, the maximum window duration in DTTC is fixed in time for all SCSs supported and for both independent and non-independent operations, for example, the fixed maximum window duration may be half a frame. In this method, the number of potential SS / PBCH block positions within the DTTC window is scalable based on the SCS of the SS / PBCH blocks in the DTTC window. For example, if the maximum window duration is fixed to D_DTTC, which corresponds to X1 potential SS / PBCH block positions for an SCS of SCS_SSB1 for the SS / PBCH block, then for an SCS of SCS_SSB2 for the SS / PBCH block, the number of potential SS / PBCH block positions within the DTTC window may be X2 = X1 / (SCS_SSB2 / SCS_SSB1). An illustration of the method is provided by Fig.10 Given.

[0108] Fig.10 An example maximum DTTC window duration 1000 with a scalable number of potential SS / PBSH blocks is illustrated according to an embodiment of the present disclosure. Fig.10 The illustrated example of maximum DTTC window duration 1000 is for illustration only. Fig.10 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0109] In yet another example, the maximum window duration is scalable based on the SCS of the SS / PBCH blocks in the DTTC window. For example, the maximum window duration is fixed for a first SCS (e.g., due to a single default SCS for SS / PBCH blocks for standalone operation), and a second SCS based on the configuration of the SS / PBCH blocks is scalable so that the number of potential SS / PBCH block positions within the DTTC window is the same. For example, if the maximum window duration is fixed to D_1 for the first SCS, the maximum window duration for the second SCS can be D_1 / (SCS_2 / SCS_1), where SCS_1 is a predefined SCS of the SS / PBCH block in kHz (e.g., for standalone operation), and SCS_2 is a configured second SCS of the SS / PBCH block in kHz (e.g., for non-standalone operation). An illustration of the method is shown in Fig.11 As shown in (for example, one of 15kHz, 30kHz and 60kHz can be SCS_1).

[0110] Fig.11An example fixed number of potential SS / PBCH block locations 1100 with a scalable DTTC window duration is illustrated according to an embodiment of the present disclosure. Fig.11 The embodiment of a fixed number of potential SS / PBCH block locations 1100 shown in FIG. 1 is for illustration only. Fig.11 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0111] In yet another example, the DTTC window offset within the configured periodicity is fixed to 0. For example, if the DTTC window periodicity is always an integer multiple of half a frame (eg, 5 milliseconds), the DTTC window may be assumed to start at a half-frame boundary.

[0112] In yet another example, the DTTC window offset within the configured periodicity is indicated by a half-frame indicator in the PBCH content such that the offset is always a multiple of 5 milliseconds.

[0113] In yet another example, the DTTC window offset within the configured periodicity may be configurable, for example, from 0 ms to 5-D_DTTC ms with a granularity of 1 ms or 1 time slot, where D_DTTC is the DTTC window duration.

[0114] In yet another example, the DTTC window duration may be fixed to a maximum DTTC window duration. In this method, there is only one DTTC window duration assumed by the UE.

[0115] In yet another example, the DTTC window duration may be configurable. For one aspect, when the DTTC window duration may be configurable, the configuration may be indicated in system information (e.g., RMSI or equivalently SIB1). For one example of a configuration, it may be a cell-specific configuration of a serving cell and indicated with a high-level parameter ServingCellConfigCommonSIB. For one example, a candidate configurable value for the DTTC window duration may be less than or equal to the maximum DTTC window duration, with a step size of 1 millisecond (e.g., if the maximum DTTC window duration is 5 milliseconds, the candidate configurable values ​​may be {1, 2, 3, 4, 5} milliseconds). For another example, if the maximum DTTC window duration is 5 milliseconds, the candidate configurable values ​​may be a set or subset of {0.25, 0.5, 1, 2, 3, 4, 5} milliseconds.

[0116] In one embodiment 2, the UE may be able to obtain timing information including symbol boundaries and indices, slot boundaries and indices, and frame boundaries and indices from a received DSCH, at least for initial access purposes in standalone operation. The indices of possible DSCH positions in the DTTC window may be indicated to the UE using signals and / or channels in the DSCH, wherein the possible DSCH positions may be associated with possible SS / PBCH block position indices within the DTTC window (e.g., equivalently as indices of possible SS / PBCH block positions within the DTTC window).

[0117] In one example, a DTTC window may have X possible predefined positions for SS / PBCH block transmissions, and each possible SS / PBCH block position needs to be indicated, then the total number of timing hypotheses to be indicated is N_t=X. X may be determined with respect to the duration of the DTTC window and the SCS of the SS / PBCH block, for example, X=D_DTTC*2*(SCS_SSB / 15), where SCS_SSB is the SCS of the SS / PBCH block in kHz. Table 2 shows an example of determining X.

[0118] In another example, a DTTC window may have X possible predefined locations for SS / PBCH block transmissions, and there is a QCL (quasi co-location) assumption among the SS / PBCH blocks within the DTTC window. In this example, each group of quasi-co-located SS / PBCH block positions needs to be indicated, and the total number of timing assumptions to be indicated is N_t=X / G, where G is the size of the group of quasi-co-located SS / PBCH blocks, for example, each pair of SS / PBCH blocks within a time slot is quasi-co-located and G=2. For example, for SS / PBCH blocks within each group, their SS / PBCH block indexes may be the same. X may be determined with respect to the duration of the DTTC window and the SCS of the SS / PBCH block, for example, X=D_DTTC*2*(SCS_SSB / 15), where SCS_SSB is the SCS of the SS / PBCH block in kHz. Table 2 shows an example of determining X.

[0119] Table 2. Example of determining the number of possible positions for SS / PBCH block transmission in the DTTC window.

[0120]

Table 2

[0121]

[0122]

[0123] For determining timing and / or QCL assumptions, at least one of the following examples and / or combinations thereof may be supported.

[0124] In one example, one of the N_t timing hypotheses (e.g., 0≤i_t≤N_t-1) representing the index of the possible position of the SS / PBCH block within the DTTC window is directly indicated to the UE by the DMRS sequence of the PBCH in the corresponding SS / PBCH block, which means that for a given cell, the number of DMRS sequences is equal to N_t, and each sequence corresponds to a potential SS / PBCH block position in the DTTC window. When the UE detects the DMRS sequence of the PBCH in the received SS / PBCH block, the UE can determine the timing (e.g., the timing position within the DTTC window) based on the index of the DMRS sequence.

[0125] In this example, if N_t can be different for independent and non-independent operation, and / or N_t can be different for different configured SCSs of SS / PBCH blocks for non-independent operation, the number of DMRS sequences can be different for the above cases. For a given cell, the corresponding DMRS sequence for the PBCH with a smaller N_t is a subset of the DMRS sequence for the PBCH with a larger N_t. If a cell can have a number N_t1 of DMRS sequences for a first SCS of a SS / PBCH block of SCS_SSB1, and can have a number N_t2 of DMRS sequences for a second SCS of a SS / PBCH block of SCS_SSB2, where N_t1>N_t2, then the set of N_t2 DMRS sequences for SCS_SSB2 is a subset of the set of N_t1 DMRS sequences for SCS_SSB1. In one example, for the same given cell ID, the DMRS sequence corresponding to i_t in the set of N_t2 DMRS sequences for SCS_SSB2 is the same as the DMRS sequence corresponding to i_t in the set of N_t1 DMRS sequences for SCS_SSB1, where 0≤i_t≤N_t2-1.

[0126] In another example, one of N_t timing hypotheses (e.g., 0≤i_t≤N_t-1) representing an index of possible locations of an SS / PBCH block is indicated to the UE by a combination of the DMRS sequence of the PBCH in the corresponding SS / PBCH block of the associated DSCH and other signals / channels of the associated DSCH (e.g., the contents of the PBCH).

[0127] In this example, the 3 LSBs of the index of the possible location of the SS / PBCH block (e.g., 0≤i_t≤N_t-1) are carried by the DMRS of the PBCH, and the remainder is carried by the content of the PBCH (e.g., the PBCH payload instead of in the MIB). If applicable (e.g., when N_t>8), the fourth LSB of the index used to indicate the possible location of the SS / PBCH block within the DTTC window, and the field in the PBCH payload instead of in the MIB If applicable (eg, when N_t>16), the fifth LSB of the index used to indicate the possible location of the SS / PBCH block within the DTTC window.

[0128] For a given cell, in this example, the number of DMRS sequences for PBCH is equal to 8. When the UE detects the DMRS sequence for PBCH in a received SS / PBCH block and decodes the timing information carried by the content of the PBCH, the UE may determine the timing (e.g., the index of the SS / PBCH block position within the DTTC window) using 8*i_PBCH+i_SSB, where i_PBCH is the decoded timing information carried by the content of the PBCH (e.g., if applicable, and ), and i_SSB is the index of the DMRS sequence in the corresponding SS / PBCH block detected.

[0129] In yet another example, a portion (e.g., 0≤i_t≤N_t-1) of the index of the possible position of the SS / PBCH block is carried by the DMRS of the PBCH, wherein the portion may be configured as i_t modulo K (i_t modulo K), and K is indicated in the PBCH content (e.g., MIB), K≤L_max (L_max is the maximum number of SS / PBCH blocks transmitted within the DTTC window for a given frequency band), and the remaining portion (e.g., floor(i_t / K)) is carried by another field in the PBCH content (e.g., PBCH content instead of MIB). When the UE detects the DMRS sequence of the PBCH in the received SS / PBCH block and decodes the timing information and K carried by the content of the PBCH, the UE may determine the timing (e.g., the timing position within the DTTC window) using K*i_PBCH+i_SSB, wherein i_PBCH is the decoded timing information carried by the content of the PBCH, and i_SSB is the index of the DMRS sequence in the detected corresponding SS / PBCH block.

[0130] In such an example, if N_t may be different for independent and non-independent operation, and / or N_t may be different for different configured SCSs of SS / PBCH blocks for non-independent operation, the number of DMRS sequences is the same for the above cases, and the indication of the remaining timing information in other signals / channels may be different for the above cases (e.g., different bit widths in the content of the PBCH). For example, if N_t is different for 15kHz SCS and 30kHz SCS of the SS / PBCH block (e.g., N_t for 30kHz SCS is twice N_t for 15kHz), the number of bits indicating the remaining timing information in other signals / channels (e.g., in the PBCH payload instead of the MIB) is different (e.g., the number of bits for 30kHz SCS is twice the number of bits for 15kHz SCS, and 1 bit may be reserved for 15kHz SCS).

[0131] For example, if N_t=20 for 30kHz SCS, then 2 bits in the PBCH payload instead of in the MIB, e.g. and The fifth and fourth LSBs of the index are used to indicate the possible location of the SS / PBCH block accordingly. And if N_t=10 for 15kHz SCS, then 1 bit in the PBCH payload instead of in the MIB, e.g. The fourth LSB of the index used to indicate the possible location of the SS / PBCH block.

[0132] In yet another example, one of the N_t timing assumptions is expressed in two parts: an SS / PBCH block index (e.g., denoted as i_SSB) and a timing offset common to all SS / PBCH blocks in the window (e.g., denoted as O_DSCH according to the number of possible SS / PBCH block positions). The SS / PBCH block index may be carried by the DMRS of the PBCH in the corresponding SS / PBCH block (which means that the SS / PBCH block index corresponds to the DMRS sequence index for a given cell). The common timing offset may be carried by the content of the PBCH (e.g., in the PBCH payload instead of the MIB). In this method, the number of DMRS sequences of the PBCH is equal to the number of SS / PBCH block indices. In this method, the number of bits used to represent O_DSCH is determined with respect to the granularity of the offset.

[0133] For example, if the granularity of the offset is 1 possible SS / PBCH block position, the number of bits used to represent O_DSCH can be For another example, if the granularity of the offset is 2 possible SS / PBCH block positions (e.g., time slots), the number of bits used to represent O_DSCH can be For yet another example, if the granularity of the offset is 4 possible SS / PBCH block locations (e.g., 2 slots, which is 1 ms at 30kHz SCS), the number of bits used to represent O_DSCH may be For yet another example, if the granularity of the offset is 8 possible SS / PBCH block locations (e.g., 4 slots, which is 2 ms at 30 kHz SCS), the number of bits used to represent O_DSCH may be In this method, after receiving the SS / PBCH block, the UE can determine that the position of the received SS / PBCH block within the DTTC window is O_DSCH+i_SSB, where O_DSCH is carried by the PBCH content of the received SS / PBCH block and i_SSB is carried by the DMRS sequence of the received SS / PBCH block.

[0134] In yet another example, if N_t may be different for independent and non-independent operation, and / or N_t may be different for different configured SCSs of SS / PBCH blocks for non-independent operation, the number of DMRS sequences is the same for the above cases, and the indication of the common timing offset may be different for the above cases (e.g., different bit widths in the content of the PBCH). For example, if N_t is different for 15kHz SCS and 30kHz SCS of the SS / PBCH block (e.g., N_t for 30kHz SCS is twice N_t for 15kHz), the number of bits indicating the common timing offset (e.g., in the PBCH payload instead of the MIB) is different (e.g., the number of bits for 30kHz SCS is twice the number of bits for 15kHz SCS, and 1 bit may be reserved for 15kHz SCS).

[0135] In yet another example, one of the N_t timing hypotheses is represented by two parts: an SS / PBCH block index (e.g., represented as i_SSB) and a timing offset common to all SS / PBCH blocks in the window (e.g., represented as O_DSCH). Both the SS / PBCH block index and the common timing offset may be carried by the DMRS of the PBCH in the corresponding SS / PBCH block, e.g., the number of DMRS sequences is equal to the product of the maximum number of SS / PBCH blocks transmitted in the DTTC window and the number of values ​​for the common offset O_DSCH. The UE may determine the position of the received SS / PBCH block as O_DSCH+i_SSB.

[0136] In another example, if N_t may be different for independent and non-independent operation, and / or N_t may be different for SCSs of different configurations of SS / PBCH blocks for non-independent operation, the number of DMRS sequences is the same for the above cases, and the indication of the common timing offset may be different for the above cases (e.g., different bit widths).

[0137] In yet another example, one of the N_t timing hypotheses (e.g., 0≤i_t≤N_t-1) representing the index of the possible position of the SS / PBCH block is directly indicated to the UE by a combination of the DMRS sequence of the PBCH in the corresponding SS / PBCH block of the associated DSCH and the mapping order of the DMRS sequence (e.g., the mapping order from the lowest RE to the highest RE and the mapping order from the highest RE to the lowest RE can be used to indicate 1 bit of information). For one example, 3 LSBs (e.g., 0≤i_t≤N_t-1) of the index of the possible position of the SS / PBCH block are carried by the DMRS of the PBCH, and the remainder is indicated by the mapping order of the sequence. In this example, the number of DMRS sequences of the PBCH is equal to 8.

[0138] In another example, if N_t may be different for independent and non-independent operation, and / or N_t may be different for SCSs of different configurations of SS / PBCH blocks for non-independent operation, the number of DMRS sequences is the same for the above cases, and the indication of the remaining timing information in other signals / channels may be different for the above cases (e.g., whether the mapping order is used to indicate the information).

[0139] In yet another example, one of the N_t timing hypotheses (e.g., 0≤i_t≤N_t-1) representing the index of the possible positions of the SS / PBCH block is indicated to the UE by a combination of the DMRS sequence of the PBCH in the corresponding SS / PBCH block of the associated DSCH and other signals / channels of the associated DSCH (e.g., the content of the PBCH). For one example, the SS / PBCH block index is carried by the DMRS of the PBCH, and the PBCH indicates the position of the corresponding SS / PBCH block by the group index with a group size equal to the granularity of the possible starting positions. For example, if the granularity of the possible starting positions is expressed as G_SSB according to the number of possible SS / PBCH block positions, the entire DTTC window can be grouped into N_t / G_SSB groups indexed from 0 to N_t / G_SSB-1, and the group index for the corresponding SS / PBCH block is indicated to the UE in the PBCH content so that the UE can determine the timing within the DTTC window and the position of the received SS / PBCH block within the transmitted burst (e.g., for rate matching purposes).

[0140] In yet another example, one of the above methods of this embodiment may be combined with the NR specification so that the above method of this embodiment is used to indicate the timing information of the SS / PBCH block in the DTTC window, and the NR specification (e.g., the DMRS of the PBCH and the content of the PBCH) is used to indicate the timing information of the SS / PBCH block outside the DTTC window, wherein, in a given cell, the DMRS sequence used for the SS / PBCH block in the DTTC window is not consistent with the DMRS sequence used for the SS / PBCH block outside the DTTC window, so that by detecting the DMRS sequence of the received SS / PBCH block, the UE can distinguish whether the received SS / PBCH block is inside or outside the DTTC window. For this method, the number of DMRS sequences used for a given cell is equal to the sum of 8 (e.g., the number in the NR specification) and the number of DMRS sequences in the above method.

[0141] In one embodiment, the index of the DMRS sequence for the PBCH in the corresponding SS / PBCH block for a given cell (e.g., denoted as i_SSB) can be determined by i_SSB=i_t mod L_max, where i_t is the index of the potential position for the SS / PBCH block within the DTTC window, and L_max is the maximum number of SS / PBCH blocks transmitted within the DTTC window for a given frequency band (e.g., for sub-7 GHz unlicensed bands, L_max=8). In this embodiment, the transmission of the SS / PBCH block is valid when the truncated SS / PBCH block is cyclically wrapped around the LBT with a fixed modulus value as L_max. The UE can further obtain the QCL assumption based on the determined index of the DMRS sequence for the PBCH in the corresponding SS / PBCH block (e.g., i_SSB).

[0142] In one example, the UE assumes that SS / PBCH blocks in different DTTC windows with the same possible location index are quasi co-located.

[0143] In another example, the UE assumes that SS / PBCH blocks in the same and / or different DTTC windows with the same index after modulo K are quasi-co-located, where K is a configurable number for a given frequency band and the index can be represented by the index of the corresponding DMRS sequence of the PBCH.

[0144] In one example, K can be in the form of L_max / k, where L_max is the maximum number of SS / PBCH blocks transmitted within the DTTC window for a given band (e.g., L_max=8 for sub-7 GHz unlicensed bands), and k is a configurable integer, then K represents the granularity of blind detection when soft combining SS / PBCH blocks, and the monitoring positions relative to the modulo K are a superset of the monitoring positions for the modulo L_max.

[0145] In another example, K can be configured from a set or subset of any integer less than or equal to L_max, where L_max is the maximum number of SS / PBCH blocks sent within the DTTC window for a given band (e.g., for sub-7 GHz unlicensed bands, L_max=8). In one approach, the configuration of K is indicated by the payload of the PBCH (e.g., the MIB of the PBCH). In another approach, the configuration of K is indicated by the RMSI. In yet another approach, the configuration of K can be obtained from a bitmap in the RMSI indicating the actual SS / PBCH blocks sent, and no explicit configuration is required in the PBCH.

[0146] For one example of this example, K may be configured using 1 bit in the payload of the PBCH (e.g., the MIB of the PBCH) or the RMSI from {4, 8} for the sub-7 GHz unlicensed band. For another example of this embodiment, K may be configured using 2 bits in the payload of the PBCH (e.g., the MIB of the PBCH) or the RMSI from {2, 4, 8} for the sub-7 GHz unlicensed band.

[0147] For another example of this embodiment, K may be configured using 2 bits in the payload of the PBCH (e.g., the MIB of the PBCH) or the RMSI from {1, 2, 4, 8} for the sub-7 GHz unlicensed band. For another example of this embodiment, K may be configured using 3 bits in the payload of the PBCH (e.g., the MIB of the PBCH) or the RMSI from {1, 2, 3, 4, 5, 6, 7, 8} for the sub-7 GHz unlicensed band.

[0148] In one consideration, K does not have to be equal to the number of SS / PBCH blocks actually sent within the DTTC window for a given frequency band, but can be greater than or equal to the number of SS / PBCH blocks actually sent within the DTTC window for a given frequency band. Therefore, the UE does not expect the number of SS / PBCH blocks actually sent within the DTTC window for a given frequency band (for example, by using a bitmap in RMSI and / or RRC indicating the SS / PBCH blocks actually sent) to be greater than K, and / or the UE does not expect the bit in the bitmap in RMSI and / or RRC (for example, ssb-PositionsInBurst) indicating the SS / PBCH blocks actually sent to take the value 1, where the bit corresponds to an SS / PBCH block with an index greater than K.

[0149] In another consideration, the UE expects a bit in the bitmap in the RMSI and / or RRC indicating the actual transmitted SS / PBCH block, which can take the value 1 only when it is within the first K bits. In this embodiment, the transmission of the SS / PBCH block is effective when the LBT is cyclically wrapped around the truncated SS / PBCH block based on the modulus of K.

[0150] In yet another consideration, when K is not configured for the UE (e.g., by PBCH content or RMSI for the serving cell, and / or by RRC parameters for neighbor cells), the UE assumes a default value for K. For example, during an initial access procedure, where the UE may not have information about K, the UE may assume a default value for K. For another example, during an RRM measurement procedure (e.g., serving cell or neighbor cell), where the UE is not configured with a value for K, the UE may assume a default value for K.

[0151] In one example, the default value of K may be 8. In another example, the default value of K may be 1. In yet another example, the default value of K may be 4. In yet another example, the default value of K may be 2. In one method for indication of K, when K is indicated in the PBCH payload, a new field in the MIB may be used to indicate K. In another method for indication of K, when K is indicated in the PBCH payload, K may be indicated using the 2 MSBs, or the 2 LSBs, or the second and third LSBs of the field controlResourceSetZero in pdcch-ConfigSIB1 in the MIB.

[0152] In yet another method for indication of K, when K is indicated in the PBCH payload, K may be indicated using 2 MSBs, or 2 LSBs, or the second and third LSBs of the field searchSpaceZero in pdcch-ConfigSIB1 in the MIB.

[0153] In another method for indicating K, when K is indicated in the PBCH payload, K may be indicated using a combination of at least 1 MSB or LSB of the searchSpaceZero field in pdcch-ConfigSIB1 in the MIB, 1 bit of the subCarrierSpacingCommon field, or 1 MSB or LSB of the controlResourceSetZero field in pdcch-ConfigSIB1.

[0154] In another method for indicating K, when K is indicated in the PBCH payload, K may be indicated using a combination of 1 MSB or LSB of the controlResourceSetZero field in pdcch-ConfigSIB1 in the MIB, 1 bit of the subCarrierSpacingCommon field, or 1 MSB or 1 LSB of the ssb-SubcarrierOffset field.

[0155] In yet another method for indication of K, when K is indicated in the PBCH payload, K may be indicated using the 2 MSBs or 2 LSBs of the field ssb-SubcarrierOffset.

[0156] In yet another method for indication of K, when K is indicated in the PBCH payload, K may be indicated using a combination of 1 MSB or LSB of the controlResourceSetZero field in pdcch-ConfigSIB1 in the MIB and 1 bit of the searchSpaceZero field in pdcch-ConfigSIB1.

[0157] In another embodiment, the index of the DMRS sequence in the corresponding SS / PBCH block for a given cell (e.g., denoted as i_SSB) can be determined by i_SSB=i_t mod(L_max / G), where i_t is the index of the potential position of the quasi-co-located SS / PBCH block for sending packets of group size G, and L_max is the maximum number of SS / PBCH blocks sent within the DTTC window for a given frequency band (e.g., for sub-7 GHz unlicensed bands, L_max=8).

[0158] In such an embodiment, transmission of SS / PBCH blocks is efficient while looping around the truncated SS / PBCH blocks due to LBT with a fixed modulus value as L_max / G.

[0159] In one example, the UE assumes that SS / PBCH blocks in different DTTC windows with the same index are quasi-co-located, where the index can be represented by the index of the corresponding DMRS sequence of the PBCH. In another example, the UE assumes that SS / PBCH blocks in different DTTC windows with the same index are quasi-co-located after modulo K, where K is indicated in the PBCH content and the index can be represented by the index of the corresponding DMRS sequence of the PBCH.

[0160] In yet another embodiment, the index of the DMRS sequence for the corresponding SS / PBCH block for a given cell (e.g., denoted as i_SSB) may be determined by i_SSB=i_t mod K, where i_t is the index of a potential location for transmitting the SS / PBCH block, and K is a configurable number for a given frequency band. For one method of this embodiment, K may be in the form of L_max / k, where L_max is the maximum number of SS / PBCH blocks transmitted within a DTTC window for a given frequency band (e.g., L_max=8 for sub-7 GHz unlicensed bands), and k is a configurable integer, then K represents the granularity of blind detection when soft combining SS / PBCH blocks, and the monitoring positions relative to modulo K are a superset of the monitoring positions for modulo L_max.

[0161] For another method of this embodiment, K may be configured from a set or subset of any integers less than or equal to L_max, where L_max is the maximum number of SS / PBCH blocks transmitted within a DTTC window for a given band (e.g., for sub-7 GHz unlicensed bands, L_max=8).

[0162] In one method, the configuration of K is indicated by the payload of the PBCH (e.g., the MIB of the PBCH). In another method, the configuration of K is indicated by the RMSI. In yet another method, the configuration of K can be obtained from a bitmap in the RMSI indicating the SS / PBCH block actually transmitted, and no explicit configuration is required in the PBCH. For an example of this embodiment, K may be configurable using 1 bit in the payload of the PBCH (e.g., the MIB of the PBCH) or the RMSI from {4, 8} for the sub-7 GHz unlicensed band. For another example of this embodiment, K may be configurable using 2 bits in the payload of the PBCH (e.g., the MIB of the PBCH) or the RMSI from {2, 4, 8} for the sub-7 GHz unlicensed band. For yet another example of this embodiment, K may be configurable using 2 bits in the payload of the PBCH (e.g., the MIB of the PBCH) or the RMSI from {1, 2, 4, 8} for the sub-7 GHz unlicensed band.

[0163] For yet another example, K may be configurable using 3 bits in the payload of the PBCH (implemented, for example, in the MIB of the PBCH) or in the RMSI from {1, 2, 3, 4, 5, 6, 7, 8} for the sub-7 GHz unlicensed band. In one consideration, K need not be equal to the number of SS / PBCH blocks actually transmitted within the DTTC window for a given band, but may be greater than or equal to the number of SS / PBCH blocks actually transmitted within the DTTC window for a given band, and thus, the UE does not expect the number of SS / PBCH blocks actually transmitted within the DTTC window for a given band (e.g., by using a bitmap in the RMSI and / or RRC indicating the SS / PBCH blocks actually transmitted) to be greater than K, and / or the UE does not expect the bit in the bitmap in the RMSI and / or RRC indicating the SS / PBCH blocks actually transmitted to take the value 1, where the bit corresponds to the SS / PBCH block with an index greater than K.

[0164] In another consideration, the UE expects that the bit in the bitmap in the RMSI and / or RRC indicating the actual transmitted SS / PBCH block can take the value 1 only when the bit is within the first K bits. In such an embodiment, the transmission of the SS / PBCH block is valid when the LBT is cyclically wrapped around the truncated SS / PBCH block based on the modulo K.

[0165] In one example, the UE assumes that SS / PBCH blocks in different DTTC windows with the same index are quasi-co-located, where the index can be represented by the index of the corresponding DMRS sequence of the PBCH. In another example, the UE assumes that SS / PBCH blocks in different DTTC windows with the same index are quasi-co-located after modulo K, where K is indicated in the PBCH content or RMSI, and the index can be represented by the index of the corresponding DMRS sequence of the PBCH. In another consideration, when K is not configured for the UE (e.g., by the PBCH content or RMSI for the serving cell, and / or by RRC parameters for neighbor cells), the UE assumes a default value of K.

[0166] For example, during an initial access procedure, where the UE may not have information about K, the UE may assume a default value of K. For another example, during an RRM measurement procedure (e.g., a serving cell or a neighbor cell), where the UE is not configured with a value of K, the UE may assume a default value of K. In one example, the default value of K may be 8. In another example, the default value of K may be 1.

[0167] In yet another embodiment, the index of the DMRS sequence for the corresponding SS / PBCH block for a given cell (e.g., denoted as i_SSB) can be determined by i_SSB=i_t-O_DSCH, where i_t is the index for the potential location of the SS / PBCH block and O_DSCH is the common time domain offset for the entire DSCH due to LBT. In such an embodiment, the transmission of the SS / PBCH block is valid when it is shifted by the group offset of O_DSCH due to LBT.

[0168] In one example, the UE assumes that SS / PBCH blocks in different DTTC windows with the same index are quasi co-located, where the index may be represented by the index of the corresponding DMRS sequence of the PBCH.

[0169] In one embodiment, a bitmap in the RMSI and / or RRC indicates the SS / PBCH blocks that are actually transmitted, e.g., a value of 1 for the i-th bit in the bitmap means that the SS / PBCH block is actually transmitted at one of the possible SS / PBCH block positions in the DTTC window, where the index of the possible SS / PBCH block position after a modulo operation with respect to K is equal to i-1, and K is a value configured for QCL determination. In this embodiment, the bitmap can be considered as the SS / PBCH blocks intended to be transmitted, and the actual position used for transmission is subject to the LBT result.

[0170] In another embodiment, the bitmap in the RMSI and / or RRC indicates the actual transmitted SS / PBCH block group with a group size G by indicating the associated SS / PBCH block index. For example, the i-th group of G bits in the bitmap with a value of 1 means that all groups of G quasi-co-located SS / PBCH blocks with SS / PBCH block index i-1 are transmitted.

[0171] In yet another embodiment, the gNB may ensure that the transmission of DSCH within the DTTC window is continuous in the time domain subject to a rule (e.g., the gap is no greater than 16 microseconds in the time domain). If the configuration of the bitmap for the indication of the actually transmitted SS / PBCH blocks has non-continuous bits with the value "1", this means that there are gaps between the transmissions of SS / PBCH blocks, and other signals / channels, such as RMSI, OSI, or PDCCH and / or PDSCH for paging, may fill in the gaps. Fig.12 An example is shown in FIG.

[0172] Fig.12 An example configuration of a bitmap 1200 with filled gaps in the time domain according to an embodiment of the present disclosure is illustrated. Fig.12 The illustrated embodiment of the configuration of bitmap 1200 is for illustration only. Fig.12One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0173] exist Fig.12 In Examples 1 and 2, the configuration of the bitmap does not result in any gaps in the time domain. Fig.12 In Examples 3 and 4, the configuration of the bitmap results in gaps in the time domain and requires other signals / channels to fill the gaps in order to be transmitted.

[0174] In yet another embodiment, if the DTTC window duration D_DTTC is greater than 5 milliseconds (e.g., 6 milliseconds), and / or the DTTC window is configured to cross a half-frame boundary, the half-frame indicator in the PBCH payload does not change for all SS / PBCH blocks in the DTTC window (e.g., is always the same as the half-frame indicator corresponding to the first possible position of transmission of the SS / PBCH block within the DTTC window).

[0175] In yet another embodiment, if the transmission of SS / PBCH blocks is cyclically wrapped around based on a modulo value K (e.g., K may be fixed to L_max or L_max / G, or indicated in the PBCH content as in an embodiment of the present disclosure), there is an indication of the position of the corresponding SS / PBCH block within the wrapped modulo value K (e.g., indicating the position of 1 to K within K). In one example, the indication is in the PBCH content. In another example, the indication is in the RMSI.

[0176] In yet another embodiment, if the transmission of SS / PBCH blocks cyclically wraps around based on a modulo value K (e.g., K may be fixed to L_max or L_max / G, or indicated in the PBCH content as in an embodiment of the present disclosure), then there is an indication of the location of the first SS / PBCH block within a burst of SS / PBCH blocks. In one example, the indication is in the PBCH content. In another example, the indication is in the RMSI. In one example, the indication is based on the SS / PBCH block index of the first SS / PBCH block. In another example, the indication is rounded down (SS / PBCH block index of the first SS / PBCH block / K). In yet another example, the indication is rounded down (SS / PBCH block index of the first SS / PBCH block / L_max). In yet another example, the indication is rounded down (SS / PBCH block index of the first SS / PBCH block / K). In yet another example, the indication is rounded down (SS / PBCH block index of the first SS / PBCH block / (L_max / G)).

[0177] In yet another embodiment, the UE assumes that the content of the RMSI is the same for the frequency layer, and the configuration of the actually transmitted SS / PBCH block in the RMSI remains the same regardless of the LBT result.

[0178] In one example, the UE may reinterpret the content of the bitmap in the RMSI and / or RRC for the actually transmitted SS / PBCH block based on timing and / or an indication of the surrounding or shifted offset information due to LBT. In this example, the bitmap in the RMSI and / or RRC may be understood as the SS / PBCH block that is desired to be actually transmitted, and the corresponding actually transmitted SS / PBCH block (e.g., represented by the index of the DMRS sequence of the SS / PBCH block) may be determined based on timing and / or an indication of the surrounding or shifted offset information due to LBT.

[0179] For example, if a common timing offset represented by the number of SS / PBCH block positions, e.g., O_DSCH, is indicated to the UE, then the UE may determine that the i-th bit in the bitmap having a value of 1 means that in the transmission scheme where the entire DSCH is shifted due to LBT, the actually transmitted SS / PBCH block has an index of (O_DSCH + i - 1) mod L_max.

[0180] In another example, if the transmission of the SS / PBCH block is cyclically wrapped around based on modulo K due to LBT, where K is indicated, the SS / PBCH block with the detected index i_SSB corresponds to the i-th bit in the bitmap indicating the actually transmitted SS / PBCH block, where if i_SSB ≥ K then i = i_SSB + 1 - K, and if i_SSB < K then i = i_SSB + 1.

[0181] In yet another embodiment, the configuration of the actually transmitted SS / PBCH block in the RMSI may vary depending on the LBT result, such that the same bitmap is applied to all actually transmitted SS / PBCH blocks on the same frequency layer within the same DTTC window, and the bitmap may vary across different DTTC windows on the same frequency layer.

[0182] In yet another embodiment, if the transmission of the SS / PBCH block is cyclically wrapped around, the allowed start position of the transmission of the DSCH including the SS / PBCH block may depend at least on the configuration of the bitmap in the RMSI indicating the actually transmitted SS / PBCH block.

[0183] Fig.13 FIG. shows an example allowed start 1300 of the transmission of the DSCH based on the bitmap indicating the actually transmitted SS / PBCH block according to an embodiment of the present disclosure. Fig.13 The embodiment of the allowed start 1300 of the transmission of the DSCH shown in is for illustration only. Fig.13 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0184] In one example (e.g., Fig.13 In example 1), when the bitmap in the RMSI indicating the actually transmitted SS / PBCH block takes a value of "1" for each bit, each possible predefined starting position for DSCH transmission can be used based on the LBT result.

[0185] In another example (e.g., Fig.13 In example 2), when the bitmap indicating the actually transmitted SS / PBCH blocks in the RMSI does not take the value "1" for each bit, there may be a gap in the time domain after some SS / PBCH blocks are cyclically wrapped due to LBT. If there is no other transmitted signal / channel to fill the gap, the transmission of DSCH may not be allowed.

[0186] In yet another example (e.g., Fig.13 Example 3), when the bitmap in the RMSI indicating the SS / PBCH block actually transmitted does not take the value "1" for each bit, there may be gaps in the time domain after some SS / PBCH blocks are cyclically wrapped around due to LBT. If there is no other transmitted signal / channel to fill the gap, the transmission of DSCH may be allowed. In one case, the RMSI, OSI, or quasi-co-located PDCCH / PDSCH for paging is not expected to be multiplexed in the time slot before the transmission of the SS / PBCH block in the same DTTC window, then the multiplexed signal / channel in the gap may not be the RMSI, OSI, or quasi-co-located PDCCH / PDSCH for paging for the SS / PBCH block to be transmitted in the subsequent time slot.

[0187] In yet another embodiment, the indication of the actually transmitted SS / PBCH blocks in the format of a bitmap is in the content of the PBCH. In one sub-embodiment, the indication remains the same for all SS / PBCH blocks on the same frequency layer. In another sub-embodiment, the indication may be different subject to the LBT result so that the same bitmap indication applies to all actually transmitted SS / PBCH blocks on the same frequency layer within the same DTTC window, and the indication of the bitmap may be different across different DTTC windows on the same frequency layer.

[0188] In yet another embodiment, the UE does not expect to receive a PDCCH or PDSCH of at least one of RMSI, OSI, or paging quasi-co-located with the received SS / PBCH block from a previous timeslot compared to the timeslot of the received SS / PBCH block included in the DTTC window.

[0189] In the NR specification, for a given cell, the number of DMRS sequences for PBCH is 8, which corresponds to the SS / PBCH block index in a half-frame or a portion thereof (e.g., 3 LSBs of the SS / PBCH block index for FR2).

[0190] In one embodiment, for a given cell, at least for some cases, the number of DMRS sequences for the PBCH may be greater than 8. For example, the number of DMRS sequences for a given cell (e.g., denoted as N_DMRS) may be equal to N_t in other embodiments of the present disclosure (e.g., the number of possible SS / PBCH block positions in a DTTC window, or the number of possible good positions in a DTTC window that carry a pair of quasi-co-located SS / PBCH blocks), or may be equal to the product of the maximum number of SS / PBCH blocks transmitted in a DTTC window in other embodiments of the present disclosure and the number of values ​​on a common offset O_DSCH.

[0191] In this embodiment, the DMRS sequence of the PBCH can be constructed by a QPSK-modulated Gold sequence. The Gold sequence is the XOR of two M sequences, where the M sequence s A (n) one of the generators g A (x) = x 31 +x 3 +1 and initial condition c A = 1, and another M sequence sB(n) is generated by generator g B (x) = x 31 +x 3 +x 2 +x+1 and initial conditions Generate, where N_ID^cell is the cell ID, i_t is the timing information carried by the DMRS sequence, where 0≤i_t≤N_DMRS-1, and c0 and c1 are predefined integers. There is a possible output shift offset Nc=1600 so that the QPSK modulated Gold sequence s(n)=(1-2*((s A (2*n+Nc)+s B (2*n+Nc))mod 2)) / √2+j*(1-2*((s A (2*n+Nc+1)+s B(2*n+Nc+1))mod 2)) / √2. s(n) is truncated to the desired DMRS sequence length and mapped to the corresponding RE for DMRS.

[0192] In one example, N_DMRS=10. For this value of N_DMRS, the parameters c0 and c1 can be selected so as to minimize the real part of the (maximum and / or average) normalized cross-correlation (for both inter-cell and intra-cell cases). In one example, c0=2^11 and c1=2^6. In another example, c0=1 and c1=2^15.

[0193] In another example, N_DMRS=16. For this value of N_DMRS, the parameters c0 and c1 can be selected so as to minimize the real part of the (maximum and / or average) normalized cross-correlation (for both inter-cell and intra-cell cases). In one example, c0=2^11 and c1=2^6. In another example, c0=1 and c1=2^14. In yet another example, c0=2^16 and c1=2^3.

[0194] In yet another example, N_DMRS=20. For this value of N_DMRS, the parameters c0 and c1 may be selected so as to minimize the real part of the (maximum and / or average) normalized cross-correlation (for both inter-cell and intra-cell cases). In one example, c0=2^11 and c1=2^6. In another example, c0=2^16 and c1=2^3. In yet another example, c0=2^12 and c1=2^4. In yet another example, c0=2^16 and c1=2^3.

[0195] In yet another example, N_DMRS=12. For this value of N_DMRS, the parameters c0 and c1 may be selected so as to minimize the real part of the (maximum and / or average) normalized cross-correlation (for both inter-cell and intra-cell cases). In one example, c0=2^11 and c1=2^6. In another example, c0=1 and c1=2^15.

[0196] DSCH can have multiple possible positions within the DTTC window for transmission based on the LBT results. The granularity of the starting position for DSCH transmission is expressed as G_SSB, which is defined in terms of the number of possible SS / PBCH block positions. For example, if G_SSB=1, every possible SS / PBCH block position within the DTTC window can be used as the starting position for DSCH transmission, regardless of whether the transmission is shifted or wrapped due to LBT. For another example, if G_SSB=2, every 2 possible SS / PBCH block positions (e.g., time slots) within the DTTC window can be used as the starting position for DSCH transmission, regardless of whether the transmission is shifted or wrapped due to LBT.

[0197] For yet another example, if G_SSB=4, every 4 possible SS / PBCH block positions within the DTTC window (e.g., 1 ms at 30kHz SCS) can be used for the starting position of the DSCH transmission, regardless of whether the transmission is shifted or wrapped due to LBT. For yet another example, if G_SSB=8, every 8 possible SS / PBCH block positions within the DTTC window (e.g., 2 ms at 30kHz SCS) can be used for the starting position of the DSCH transmission, regardless of whether the transmission is shifted or wrapped due to LBT.

[0198] In one embodiment, the granularity of the starting position G_SSB depends on the LBT type. For example, if Cat2 LBT is used (assuming that the conditions for applying Cat2 LBT are met), the granularity of the starting position is G_SSB-Cat2, and if Cat4 LBT is used, the granularity of the starting position is G_SSB-Cat4, where G_SSB-Cat2 is not the same as G_SSB-Cat4 (e.g., G_SSB-Cat2>G_SSB-Cat4). For a specific example, G_SSB-Cat2=4, and G_SSB-Cat4=1.

[0199] In another embodiment, the granularity G_SSB of the starting position is the same regardless of the LBT type. For example, the granularity of the starting position is 4 regardless of whether Cat2 or Cat4 LBT is used. For another example, the granularity of the starting position is 1 regardless of whether Cat2 or Cat4 LBT is used.

[0200] In one embodiment, the COT obtained by the gNB has a remaining duration after the scheduled transmission of the DSCH, the gNB may repeat the transmission of the entire DSCH burst within the COT and indicate the number of repetitions in the PBCH. For one example, the indication is in the PBCH content rather than in the MIB. For one example, there is an upper limit on the number of repetitions (e.g., subject to the bit width of the indication in the PBCH).

[0201] In another embodiment, the transmission of SS / PBCH blocks within the DTTC window may be repeated, and the number of repetitions is indicated in the PBCH. For example, the PBCH indicates the number of repetitions, for example, G, and the UE assumes that every G SS / PBCH blocks are repeatedly sent and are quasi-co-located.

[0202] One or more of the following methods may be supported for timing and QCL assumption indication for NR-U.

[0203] In one embodiment, the fourth LSB of SFN is in the MIB for NR-U so that there can be one more bit for indicating timing information and / or QCL assumption information about LBT, where the one more bit is not included in the MIB but in the PBCH payload.

[0204] In another embodiment, the bit width of the MIB is determined to be 16 for NR-U so that more bits (e.g., 8 more bits) can be used to indicate timing information and / or QCL assumption information about LBT.

[0205] In another embodiment, L_max can be equal to 4 and the half radio frame indicator is carried by the DMRS sequence of the PBCH, so that there is no indication of the half frame in the PBCH content, and the saved bits can be used to indicate timing information and / or QCL assumption information about the LBT, wherein the extra bit is not included in the MIB but in the PBCH payload.

[0206] Fig.14 The diagram may be performed by a UE (eg, Figure 1 111-116) shown in FIG. 111-116), an example of a method 1400 for discovering timing configuration of signals and channels according to an embodiment of the present disclosure. Fig.14 The illustrated embodiment of method 1400 is for illustration only. Fig.14 One or more of the components illustrated in the drawings may be implemented in a dedicated circuit system configured to perform the functions, or one or more of the components may be implemented by one or more processors that execute instructions to perform the functions. Other embodiments may be used without departing from the scope of the present disclosure.

[0207] like Fig.14 As shown, the method 1400 starts at step 1402. At step 1402, the UE determines a set of discovery signal and channel (DSCH) transmission windows based on a window periodicity, a window duration, and a window offset.

[0208] In step 1402, the window offset of the DSCH transmission window for the set of DSCH transmission windows is fixed, and the DSCH transmission window of the set of DSCH transmission windows starts from the boundary of the half frame.

[0209] Subsequently, in step 1404, the UE determines a first set of quasi-co-located synchronization signal and physical broadcast channel (SS / PBCH) blocks within a DSCH transmission window of a set of DSCH transmission windows, wherein the first set of SS / PBCH blocks is quasi-co-located (QCLed).

[0210] Next, at step 1404, the UE determines a second set of quasi-co-located SS / PBCH blocks across at least two DSCH transmission windows, the at least two DSCH transmission windows being different DSCH windows of the set of DSCH transmission windows. In this step 1404, the second set of SS / PBCH blocks is quasi-co-located.

[0211] In one embodiment, if a first SS / PBCH block in the first set of SS / PBCH blocks includes the same value of (I mod K), the first set of SS / PBCH blocks is determined to be quasi-co-located; and if a second SS / PBCH block in the second set of SS / PBCH blocks includes the same value of (I mod K), the second set of SS / PBCH blocks is determined to be quasi-co-located, where I is an index of a DMRS sequence associated with a PBCH of the first SS / PBCH block or the second SS / PBCH block, and based on a combination of the least significant bits (LSBs) of the first field of subCarrierSpacingCommon and the second field ssb-SubcarrierOffset, K is determined to be one from {1, 2, 4, 8}, where the first field and the second field are included in a master information block (MIB) of the first and second sets of SS / PBCH blocks.

[0212] Finally, in step 1408, the UE receives at least one SS / PBCH block located in the first set of SS / PBCH blocks or the second set of SS / PBCH blocks within the DSCH transmission window of the determined set of DSCH transmission windows from a base station (BS) via a downlink channel supporting shared spectrum channel access.

[0213] In one embodiment, the UE determines the window periodicity of the DSCH transmission window for the set of DSCH transmission windows as the periodicity of at least one SS / PBCH block in the DSCH transmission window. In this embodiment, the UE does not receive at least one SS / PBCH block outside the determined set of DSCH transmission windows.

[0214] In one embodiment, the UE receives at least one SS / PBCH block based on a candidate SS / PBCH block position within a DSCH transmission window of a set of DSCH transmission windows. In such an embodiment, a plurality of candidate SS / PBCH block positions within a DSCH transmission window of the set of DSCH transmission windows are determined based on a subcarrier spacing (SCS) of at least one SS / PBCH block, and a maximum number of candidate SS / PBCH block positions within a DSCH transmission window of the set of DSCH transmission windows is determined to be 20 for an SCS of at least one SS / PBCH block of 30 kHz and is determined to be 10 for an SCS of at least one SS / PBCH block of 15 kHz.

[0215] In one embodiment, the UE determines a timing instance of the received at least one SS / PBCH block based on an index of a candidate SS / PBCH block position within a DSCH transmission window of a set of DSCH transmission windows.

[0216] In such an embodiment, three least significant bits (LSBs) of an index of a candidate SS / PBCH block position are determined based on a demodulation reference signal (DMRS) associated with a PBCH of the received at least one SS / PBCH block; and if a maximum number of candidate SS / PBCH block positions within a DSCH transmission window of the set of DSCH transmission windows is 10 or 20, then the index of the candidate SS / PBCH block position is determined based on bits in a payload of the PBCH of the received at least one SS / PBCH block. determining a fourth LSB of an index of a candidate SS / PBCH block position; and if a maximum number of candidate SS / PBCH block positions within a DSCH transmission window of the set of DSCH transmission windows is 20, then determining a fourth LSB of an index of a candidate SS / PBCH block position based on a bit in a payload of a PBCH of at least one received SS / PBCH block; Determine the fifth LSB of the index of the candidate SS / PBCH block location.

[0217] Although the present disclosure has been described with exemplary embodiments, various changes and modifications may be suggested to one skilled in the art. The present disclosure is intended to encompass such changes and modifications as fall within the scope of the appended claims.

[0218] Nothing in the description of this application should be read as implying that any particular element, step, or function is an essential element that must be included in the scope of the claims. The subject matter of the patent is limited only by the claims. In addition, no claim is intended to invoke 35 U.S.C. §112(f) unless the exact words "means for..." are followed by a participle.

Claims

1. A method performed by a terminal in a communication system, the method comprising: determining a discovery burst transmission window starting from a first symbol of a first time slot in a half frame; receiving, via the shared spectrum, from a base station an SS / PBCH block corresponding to a candidate synchronization signal and physical broadcast channel SS / PBCH block index in a discovery burst transmission window; Wherein, the candidate SS / PBCH block has a possible time position of the SS / PBCH block in the discovery burst transmission window, Wherein, when the subcarrier spacing of the SS / PBCH block is 15 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 10, wherein, when the subcarrier spacing of the SS / PBCH block is 30 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 20, and The three least significant bits (LSBs) of the candidate SS / PBCH block index are based on a demodulation reference signal DMRS sequence of a physical broadcast channel PBCH, and the remaining bits of the candidate SS / PBCH block index are based on a PBCH payload.

2. The method according to claim 1, wherein: In response to the number of candidate SS / PBCH blocks being 10, 1 bit other than the 3 LSBs of the candidate SS / PBCH block index is based on the PBCH payload, and In response to the number of candidate SS / PBCH blocks being 20, 2 bits of the candidate SS / PBCH block index except for 3 LSBs are based on the PBCH payload.

3. The method according to claim 1, wherein: The SS / PBCH block index of the SS / PBCH block is determined based on a modulo operation of the candidate SS / PBCH block index with respect to the maximum number of SS / PBCH blocks transmitted in the discovery burst transmission window.

4. The method according to claim 3, wherein: The SS / PBCH blocks in a group of quasi-co-located QCLed SS / PBCH blocks in a burst transmission window are found to have the same SS / PBCH block index.

5. The method according to claim 1, wherein: The duration of the burst transmission window is found to be 0.5ms, 1ms, 2ms, 3ms, 4ms, or 5ms, and Therein, it is found that the periodicity of the burst transmission window is the same as the periodicity configured for reception of SS / PBCH blocks.

6. A method performed by a base station in a communication system, the method comprising: determining a discovery burst transmission window starting from a first symbol of a first time slot in a half frame; Based on a channel access procedure performed by the base station, sending an SS / PBCH block corresponding to a candidate synchronization signal and physical broadcast channel SS / PBCH block index to the terminal in a discovery burst transmission window via a shared spectrum; Wherein, the candidate SS / PBCH block has a possible time position of the SS / PBCH block in the discovery burst transmission window, Wherein, when the subcarrier spacing of the SS / PBCH block is 15 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 10, wherein, when the subcarrier spacing of the SS / PBCH block is 30 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 20, and The three least significant bits (LSBs) of the candidate SS / PBCH block index are based on a demodulation reference signal DMRS sequence of a physical broadcast channel PBCH, and the remaining bits of the candidate SS / PBCH block index are based on a PBCH payload.

7. The method according to claim 6, wherein: In response to the number of candidate SS / PBCH blocks being 10, 1 bit other than the 3 LSBs of the candidate SS / PBCH block index is based on the PBCH payload, and In response to the number of candidate SS / PBCH blocks being 20, 2 bits of the candidate SS / PBCH block index except for 3 LSBs are based on the PBCH payload.

8. The method according to claim 6, wherein: The SS / PBCH block index of the SS / PBCH block is determined based on a modulo operation of the candidate SS / PBCH block index with respect to the maximum number of SS / PBCH blocks transmitted in the discovery burst transmission window.

9. The method according to claim 8, wherein: The SS / PBCH blocks in a group of quasi-co-located QCLed SS / PBCH blocks in a burst transmission window are found to have the same SS / PBCH block index.

10. The method according to claim 6, wherein: The duration of the burst transmission window is found to be 0.5ms, 1ms, 2ms, 3ms, 4ms, or 5ms, and Therein, it is found that the periodicity of the burst transmission window is the same as the configured periodicity for the transmission of SS / PBCH blocks.

11. A terminal in a communication system, the terminal comprising: Transceiver; as well as Controller, configured as: determining a discovery burst transmission window starting from a first symbol of a first time slot in a half frame; receiving, via the shared spectrum, from a base station an SS / PBCH block corresponding to a candidate synchronization signal and physical broadcast channel SS / PBCH block index in a discovery burst transmission window; Wherein, the candidate SS / PBCH block has a possible time position of the SS / PBCH block in the discovery burst transmission window, Wherein, when the subcarrier spacing of the SS / PBCH block is 15 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 10, wherein, when the subcarrier spacing of the SS / PBCH block is 30 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 20, and The three least significant bits (LSBs) of the candidate SS / PBCH block index are based on a demodulation reference signal DMRS sequence of a physical broadcast channel PBCH, and the remaining bits of the candidate SS / PBCH block index are based on a PBCH payload.

12. The terminal according to claim 11, wherein: In response to the number of candidate SS / PBCH blocks being 10, 1 bit other than the 3 LSBs of the candidate SS / PBCH block index is based on the PBCH payload, and In response to the number of candidate SS / PBCH blocks being 20, 2 bits of the candidate SS / PBCH block index except for 3 LSBs are based on the PBCH payload.

13. The terminal according to claim 11, wherein: The SS / PBCH block index of the SS / PBCH block is determined based on a modulo operation of the candidate SS / PBCH block index with respect to the maximum number of SS / PBCH blocks transmitted in the discovery burst transmission window.

14. The terminal according to claim 13, wherein: The SS / PBCH blocks in a group of quasi-co-located QCLed SS / PBCH blocks in a burst transmission window are found to have the same SS / PBCH block index.

15. The terminal according to claim 11, wherein: The duration of the burst transmission window is found to be 0.5ms, 1ms, 2ms, 3ms, 4ms, or 5ms, and Therein, it is found that the periodicity of the burst transmission window is the same as the periodicity configured for reception of SS / PBCH blocks.

16. A base station in a communication system, the base station comprising: Transceiver; as well as Controller, configured as: determining a discovery burst transmission window starting from a first symbol of a first time slot in a half frame; Based on a channel access procedure performed by the base station, sending an SS / PBCH block corresponding to a candidate synchronization signal and physical broadcast channel SS / PBCH block index to the terminal in a discovery burst transmission window via a shared spectrum; Wherein, the candidate SS / PBCH block has a possible time position of the SS / PBCH block in the discovery burst transmission window, Wherein, when the subcarrier spacing of the SS / PBCH block is 15 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 10, wherein, when the subcarrier spacing of the SS / PBCH block is 30 kHz and the duration of the discovery burst transmission window is 5 ms, the number of possible time positions of the SS / PBCH block in the discovery burst transmission window is 20, and The three least significant bits (LSBs) of the candidate SS / PBCH block index are based on a demodulation reference signal DMRS sequence of a physical broadcast channel PBCH, and the remaining bits of the candidate SS / PBCH block index are based on a PBCH payload.

17. The base station according to claim 16, wherein: In response to the number of candidate SS / PBCH blocks being 10, 1 bit other than the 3 LSBs of the candidate SS / PBCH block index is based on the PBCH payload, and In response to the number of candidate SS / PBCH blocks being 20, 2 bits of the candidate SS / PBCH block index except for 3 LSBs are based on the PBCH payload.

18. The base station according to claim 16, wherein: The SS / PBCH block index of the SS / PBCH block is determined based on a modulo operation of the candidate SS / PBCH block index with respect to the maximum number of SS / PBCH blocks transmitted in the discovery burst transmission window.

19. The base station according to claim 18, wherein: The SS / PBCH blocks in a group of quasi-co-located QCLed SS / PBCH blocks in a burst transmission window are found to have the same SS / PBCH block index.

20. The base station according to claim 16, wherein: The duration of the burst transmission window is found to be 0.5ms, 1ms, 2ms, 3ms, 4ms, or 5ms, and Therein, it is found that the periodicity of the burst transmission window is the same as the configured periodicity for the transmission of SS / PBCH blocks.

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