Cell measurement based on primary synchronization signal

Abstract

A terminal device includes at least one processor and a memory storing instructions. When the instructions are executed by the at least one processor, the terminal device at least: obtains a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; obtains a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) of the SSB; and performs cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to U.S. Provisional Patent Application No. 62 / 984,073, filed on March 2, 2020, entitled “USING PRIMARYSYNCHRONIZATION SIGNAL FOR 5G CELL MEASUREMENT,” the entire contents of which are incorporated herein by reference. Background Art

[0003] Embodiments of the present disclosure relate to apparatus and methods for wireless communications.

[0004] Wireless communication systems are widely deployed to provide various telecommunication services such as telephony, video, data, messaging, and broadcasting. Cell measurement is a process performed at the physical layer on the user equipment (UE) side to quantify the quality of its serving cell and neighboring cells. Such measurement results are used for upper layer radio resource management (RRM) decisions or for some physical layer processes such as beam management. There are two types of physical layer cell measurements: Synchronization Signal / PBCH Block (SSB)-based measurements and Channel State Information Reference Signal (CSI-RS)-based measurements. Summary of the invention

[0005] Embodiments of an apparatus and method for cell measurement based on a primary synchronization signal (PSS) are disclosed herein.

[0006] In one example, a terminal device includes at least one processor and a memory storing instructions. When the instructions are executed by the at least one processor, the terminal device at least: obtains a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; obtains a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) of the SSB; and performs cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0007] In another example, a terminal device includes at least one processor and a memory storing instructions. When the instructions are executed by the at least one processor, the terminal device at least: obtains a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; obtains a primary synchronization signal (PSS) of the SSB; obtains a physical layer cell identity (PCI) of at least one base station based on the SSB; when it is determined that the SSB contains more than one PCI, determines the PSS sequence number of each PCI; and when it is determined that the PSS sequence numbers of at least two PCIs are different, performs cell measurement based on at least the PSS.

[0008] In yet another example, a baseband chip including a physical (PHY) layer circuit is disclosed. The PHY layer circuit includes a receiving module, an extraction module, and a cell measurement module. The receiving module is configured to obtain a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station. The extraction module is configured to extract a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) from the SSB. The cell measurement module is configured to perform cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0009] In another example, a method for wireless communication implemented by a terminal device is disclosed. The method includes: obtaining a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; obtaining a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) of the SSB; and performing cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0010] In another example, a method for wireless communication implemented by a terminal device is disclosed. The method includes obtaining a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; obtaining a primary synchronization signal (PSS) of the SSB; obtaining a physical layer cell identity (PCI) of the at least one base station based on the SSB; determining whether the SSB contains more than one PCI; when determining that the SSB contains more than one PCI, determining a PSS sequence number for each PCI; and when determining that the PSS sequence numbers of at least two PCIs are different, performing cell measurement based at least on the PSS.

[0011] In another example, a method implemented by a physical (PHY) layer circuit of a baseband chip is disclosed. The method includes obtaining a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; extracting a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) from the SSB; and performing cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The accompanying drawings, which are incorporated herein and form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, further serve to explain the principles of the present disclosure and enable those skilled in the relevant art to make and use the present disclosure.

[0013] Figure 1 An exemplary wireless network according to some embodiments of the present disclosure is shown.

[0014] Figure 2 A block diagram of an exemplary node according to some embodiments of the present disclosure is shown.

[0015] Figure 3 An exemplary SSB according to some embodiments of the present disclosure is shown.

[0016] Figure 4 An exemplary use case of at least PSS-based cell measurement according to some embodiments of the present disclosure is shown.

[0017] Figure 5 Exemplary determination operations of PCI and PSS sequence numbers according to some embodiments of the present disclosure are shown.

[0018] Figure 6 A block diagram of a device including a baseband chip, a radio frequency (RF) chip, and a host chip according to some embodiments of the present disclosure is shown.

[0019] Figure 7 A block diagram of an exemplary baseband chip for cell measurement based on a combination of PSS, SSS, and PBCH DMRS according to some embodiments of the present disclosure is shown.

[0020] Figure 8 A flow chart of an exemplary method for cell measurement based on a combination of PSS, SSS, and PBCH DMRS according to some embodiments of the present disclosure is shown.

[0021] Embodiments of the present disclosure will be described with reference to the accompanying drawings. DETAILED DESCRIPTION

[0022] Although specific configurations and arrangements are discussed, it should be understood that this is for illustrative purposes only. Those skilled in the relevant art will recognize that other configurations and arrangements may be used without departing from the spirit and scope of the present disclosure. It will be apparent to those skilled in the relevant art that the present disclosure may also be used for various other applications.

[0023] Note that references to "one embodiment," "an embodiment," "exemplary embodiments," "some embodiments," "certain embodiments," etc. in the specification indicate that the described embodiments may include specific features, structures, or characteristics, but not every embodiment necessarily includes the specific features, structures, or characteristics. Furthermore, such wording does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of a person skilled in the relevant art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether or not explicitly described.

[0024] Generally speaking, terms can be understood at least in part from usage in context. For example, the term "one or more" as used herein may be used to describe any feature, structure, or characteristic in a singular sense, or may be used to describe a combination of features, structures, or characteristics in a plural sense, depending at least in part on the context. Similarly, terms such as "a" or "the" may also be understood to convey singular usage or to convey plural usage, depending at least in part on the context. In addition, the term "based on" may be understood to not necessarily be intended to convey a unique set of factors, but rather may allow for the presence of some additional factors that are not necessarily explicitly described, which may also depend at least in part on the context.

[0025] Various aspects of the wireless communication system will now be described with reference to various devices and methods. These devices and methods will be described in the detailed description below and illustrated in the accompanying drawings by various blocks, modules, units, components, circuits, steps, operations, processes, algorithms, etc. (collectively referred to as "elements"). These elements can be implemented using electronic hardware, firmware, computer software, or any combination thereof. Whether these elements are implemented as hardware, firmware, or software depends on the specific application and the design constraints imposed on the overall system.

[0026] The technology described herein can be used for various wireless communication networks, such as code division multiple access (CDMA) systems, time division multiple access (TDMA) systems, frequency division multiple access (FDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems and other networks. The terms "network" and "system" are often used interchangeably. A CDMA network can implement a radio access technology (RAT), such as Universal Terrestrial Radio Access (UTRA), Evolved UTRA (E-UTRA), CDMA 2000, etc. A TDMA network can implement a RAT such as GSM. An OFDMA network can implement a RAT, such as Long Term Evolution (LTE) or New Radio (NR). The technology described herein can be used for the above-mentioned wireless networks and RATs as well as other wireless networks and RATs.

[0027] Some existing solutions perform cell measurement based on the Secondary Synchronization Signal (SSS) and Physical Broadcast Channel (PBCH) Demodulation Reference Signal (DMRS) sequences within SSB. However, due to the limited number of reference signal samples in SSS and PBCH DMRS in each SSB, the performance of cell search, especially in terms of measurement accuracy, is not ideal in existing solutions.

[0028] According to various embodiments of the present disclosure, an improved cell measurement scheme based on a primary synchronization signal (PSS) in each SSB is provided to achieve higher measurement accuracy compared to existing solutions. In some embodiments, in addition to the SSS and PBCH DMRS, a PSS having a greater number of reference signal samples per SSB than the SSS or PBCH DMRS is also used for cell measurement to achieve higher accuracy. Therefore, the cell measurement scheme disclosed herein can avoid erroneous handover or cell reselection decisions due to inaccurate measurements, allowing the UE to quickly detect service cell quality issues when moving out of coverage, and allowing the UE to quickly detect a handover target cell in a radio resource control (RRC) connected state or detect a cell for reselection in an RRC idle state. In addition, since reliable measurements can be obtained with fewer measurement trials, UE battery power consumption can also be reduced.

[0029] Figure 1 1 shows an exemplary wireless network 100 in which certain aspects of the present disclosure may be implemented according to some embodiments of the present disclosure. Figure 1 As shown, the wireless network 100 may include a network of nodes, such as a terminal device 102, an access node 104, and a core network element 106. The terminal device 102 may be any terminal device, such as a mobile phone, a desktop computer, a laptop computer, a tablet computer, a vehicle-mounted computer, a game console, a printer, a positioning device, a wearable electronic device, a smart sensor, or any other device capable of receiving, processing, and sending information, such as any of a vehicle-to-everything (V2X) network, a cluster network, a smart grid node, and an Internet of Things (IoT) node. It should be understood that the terminal device 102 is shown as a mobile phone by way of illustration only and not limitation.

[0030] The access node 104 may be a device that communicates with the terminal device 102, such as a wireless access point, a base station (BS), a node B, an enhanced node B (eNodeB or eNB), a next generation node B (gNodeB or gNB), a cluster master node, etc. The access node 104 may have a wired connection to the terminal device 102, a wireless connection to the terminal device 102, or any combination thereof. The access node 104 may be connected to the terminal device 102 through multiple connections, and the terminal device 102 may be connected to other access nodes in addition to the access node 104. The access node 104 may also be connected to other terminal devices. It should be understood that the access node 104 is shown as a radio tower in an illustrative and non-limiting manner.

[0031] The core network element 106 can serve the access node 104 and the terminal device 102 to provide core network services. Examples of the core network element 106 may include a home subscriber server (HSS), a mobility management entity (MME), a serving gateway (SGW), or a packet data network gateway (PGW). These are examples of core network elements of an evolved packet core (EPC) system, which is the core network of an LTE system. Other core network elements can be used in LTE and other communication systems. In some embodiments, the core network element 106 includes an access and mobility management function (AMF) device, a session management function (SMF) device, or a user plane function (UPF) device for the core network of the NR system. It should be understood that the core network element 106 is shown as a group of rack servers in an illustrative and non-restrictive manner.

[0032] The core network element 106 may be connected to a larger network such as the Internet 108 or another Internet Protocol (IP) network to transmit packet data over any distance. In this manner, data from the terminal device 102 may be transmitted to other terminal devices connected to other access points, including, for example, a computer 110 connected to the Internet 108 using a wired or wireless connection, or a tablet computer 112 connected to the Internet 108 wirelessly via a router 114. Thus, the computer 110 and the tablet computer 112 provide additional examples of possible terminal devices, while the router 114 provides another example of a possible access node.

[0033] The illustration of the core network element 106 is provided as a general example of a rack-mounted server. However, there may be multiple elements in the core network, including database servers such as database 116, and security and authentication servers such as authentication server 118. For example, database 116 may manage data related to user subscriptions to network services. The Home Location Register (HLR) is an example of a standardized database of user information for a cellular network. Similarly, authentication server 118 may handle authentication of users, sessions, etc. In an NR system, an authentication server function (AUSF) device may be a specific entity that performs terminal device authentication. In some embodiments, a single server rack may handle multiple such functions, so that the connections between the core network element 106, authentication server 118, and database 116 may be local connections within a single rack.

[0034] As described in detail below, in some embodiments, the terminal device 102 (e.g., UE) extracts PSS, SSS, and PBCH DMRS from the SSB received from the access node 104 (e.g., node). Then, the terminal device 102 can detect the physical layer cell identifier (PCI) of the base station and the PSS sequence number of each PCI from the SSB. The terminal device 102 also detects the first per resource unit energy (EPRE) value of the PSS and the second EPRE value of the SSS. According to the detection and comparison results of the PCI, the PSS sequence number, and the EPRE value, the terminal device 102 can perform cell measurement based on a combination of PSS, SSS, and PBCH DMRS. The PCI can be an identifier (ID) of a cell in the physical layer of a wireless network, such as an LTE PCI of an LTE network or an NR PIC of an NR network, for cell identification during a cell selection process. The PIC can determine a cell ID group and a cell ID sector. In one example, there can be 504 possible LTE PCIs from 168 possible LTE cell ID groups, each LTE cell ID group having 3 possible LTE cell ID sectors. In another example, there may be 1008 possible NRPCIs from 336 possible NR cell ID groups, each with 3 possible NR cell ID sectors.

[0035] Figure 1 Each element of can be considered as a node of wireless network 100. Figure 2 More details about possible implementations of the node are provided by way of example in the description of the node 200 in FIG. Node 200 may be configured as Figure 1 The terminal device 102, access node 104, or core network element 106 in the embodiment of the present invention. Similarly, the node 200 can also be configured as Figure 1 The computer 110, the router 114, the tablet computer 112, the database 116, or the authentication server 118 in FIG. Figure 2 As shown, the node 200 may include a processor 202, a memory 204, and a transceiver 206. These components are shown as being connected to each other via a bus, but other connection types are also allowed. When the node 200 is a terminal device 102, it may also include additional components, such as a user interface (UI), a sensor, etc. Similarly, when the node 200 is configured as a core network element 106, the node 200 may be implemented as a blade in a server system. Other implementations are also feasible.

[0036] The transceiver 206 may include any suitable device for sending and / or receiving data. The node 200 may include one or more transceivers, but only one transceiver 206 is shown for simplicity of illustration. The antenna 208 is shown as a possible communication mechanism for the node 200. Multiple antennas and / or antenna arrays may be utilized. In addition, examples of the node 200 may communicate using wired technology instead of wireless technology, or may communicate using wired technology in addition to wireless technology. For example, the access node 104 may communicate wirelessly with the terminal device 102, and may communicate with the core network element 106 via a wired connection (e.g., via an optical cable or a coaxial cable). Other communication hardware, such as a network interface card (NIC), may also be introduced.

[0037] like Figure 2 As shown, node 200 may include processor 202. Although only one processor is shown, it should be understood that multiple processors may be included. Processor 202 may include a microprocessor, a microcontroller, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device (PLD), a state machine, a gated logic, a discrete hardware circuit, and other suitable hardware configured to perform various functions described throughout this disclosure. Processor 202 may be a hardware device with one or more processing cores. Processor 202 may execute software. Software should be broadly interpreted as instructions, instruction sets, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable programs, execution threads, processes, functions, etc., whether or not referred to as software, firmware, middleware, microcode, hardware description language, etc. Software may include computer instructions written in an interpreted language, a compiled language, or a machine code. Under the broad category of software, other techniques for directing hardware are also allowed.

[0038] like Figure 2 As shown, node 200 may also include memory 204. Although only one memory is shown, it should be understood that multiple memories may be included. Memory 204 may include both memory and storage devices extensively. For example, memory 204 may include random access memory (RAM), read-only memory (ROM), static RAM (SRAM), dynamic RAM (DRAM), ferroelectric RAM (FRAM), electrically erasable programmable ROM (EEPROM), CD-ROM or other optical disk storage, hard disk drive (HDD), such as disk storage or other magnetic storage devices, flash drives, solid state drives (SSD) or any other medium that may be used to carry or store the required program code in the form of instructions that can be accessed and executed by processor 202. Broadly, memory 204 may be embodied by any computer-readable medium, such as non-temporary computer-readable medium.

[0039] In some embodiments, the processor 202, memory 204, and transceiver 206 of the node 200 are implemented (e.g., integrated) on a system on chip (SoC). For example, the processor 202, memory 204, and transceiver 206 may be integrated on a baseband SoC (also referred to as a modem SoC or baseband modem chipset), which may run an operating system (OS), such as a real-time operating system (RTOS) as its firmware. Various aspects of the present disclosure related to at least PSS-based cell measurements may be implemented as hardware, software, and / or firmware elements in a baseband SoC of a terminal device 102. It should be understood that in some examples, one or more of the software and / or firmware elements may also be implemented as dedicated hardware elements in the SoC.

[0040] Figure 3 An exemplary structure of an SSB according to some embodiments of the present disclosure is shown. The SSB includes three specific signals and one physical channel: a primary synchronization signal (PSS), SSS, DMRS, and PBCH. Orthogonal frequency division multiplexing (OFDM) is used as a multiplexing format. OFDM is a type of digital transmission and a method of encoding digital data on multiple carrier frequencies, and is used in applications such as digital television and audio broadcasting, wireless networks, power line networks, and mobile communications. OFDM is a frequency division multiplexing (FDM) scheme in which multiple closely spaced orthogonal subcarrier signals with overlapping spectrum are transmitted in parallel to carry data. Demodulation is based on a fast Fourier transform (FTT) algorithm. In some embodiments, OFDM uses a guard interval that provides better orthogonality in transmission channels affected by multipath propagation. Each subcarrier (i.e., signal) can be modulated at a low symbol rate using a conventional modulation scheme (e.g., quadrature amplitude modulation or phase shift keying). The modulated subcarrier maintains a total data rate similar to that of a conventional single carrier modulation scheme in the same bandwidth.

[0041] like Figure 3As shown, the PSS is a binary pseudo-random m-sequence with a duration of 127 subcarriers (SC), which can occupy the first OFDM symbol and represent the physical layer identification within the cell identification group. In some embodiments, the PSS occupies subcarriers with indices from 56 to 182. The SSS located in the third OFDM symbol and with a duration of 127 subcarriers is generated by a combination of two m-sequences and, like the PSS, occupies subcarriers with indices from 56 to 182. The DMRS is located on every 4 subcarriers in each synchronization block OFDM symbol. The DMRS occupies 144 resource units within the synchronization block. The PBCH can occupy two complete OFDM symbols and multiple parts of a complete OFDM symbol. In some embodiments, the PBCH sends 4 common information fields with service data, and the terminal device must demodulate these 4 common information fields. 576 information bits are sent via the PBCH in each SSB, of which the last 24 bits are cyclic redundancy check (CRC) and the first 24 bits are used to detect the main parameters of the cell configuration. Using the remaining 8 bits, the terminal device can find the sequence number of the SSB in the frame, and then can detect the start of the radio frame and then start the process of time synchronization.

[0042] from Figure 3 It can be seen that within the SSB, there are 127 subcarriers in the frequency domain for SSS. On the other hand, PBCH is distributed over 576 subcarriers, i.e., 240+240+48+48=576. Among the 576 subcarriers used for PBCH, one quarter is a DMRS signal, i.e., 144 subcarriers. Although existing solutions only use SSS and PBCH DMRS subcarriers for cell measurement, which is equivalent to only 271 subcarriers, i.e., 127 (SSS) + 144 (DMRS) = 271, the present disclosure uses PSS together with SSS and PBCH DMRS for more accurate cell measurement.

[0043] refer to Figure 3 , it can be seen that the PSS is mapped to 127 subcarriers near the lower end of the system bandwidth. PSS is used by the UE for downlink frame synchronization and provides radio frame boundaries in radio frames. PSS is also a factor in determining PCI. When PSS is combined with SSS and PBCH DMRS for cell measurement, the total number of subcarriers is 127 (PSS) + 127 (SSS) + 144 (DMRS) = 398. Therefore, compared with the existing solution that only uses SSS and PBCH DMRS for cell measurement, the present disclosure provides an apparatus and method for increasing the amount of reference signals by 47%. The addition of PSS subcarriers can improve the accuracy of cell measurements by increasing reference signal samples.

[0044] It should be understood that in Figure 3In the present disclosure, an NR PSS using an m-sequence and mapped to 127 subcarriers is used as an example to describe the present disclosure. However, other wireless communication standards using different amounts of subcarriers may also be applied to the present disclosure. For example, an LTE PSS using a Zadoff-Chu sequence and mapped to 72 subcarriers may also be applied to the present disclosure.

[0045] Figure 4 An exemplary use case of PSS-based cell measurement according to some embodiments of the present disclosure is shown. Figure 4 As shown, the terminal device 400 (for example, Figure 1 ) may include a processor 402 (e.g., Figure 2 2) and memory 404 (e.g., Figure 2 In some embodiments, the terminal device 400 receives a message from a base station 406 (eg, Figure 1 In some embodiments, the terminal device 400 may obtain SSBs from more than one base station, for example, Figure 4 As shown, SSB is obtained from base station 406 and base station 408.

[0046] Although base station 406 or 408 is shown as a single element, it will be understood that base station 406 or 408 can be replaced by any number of interconnected base stations and / or network elements. Base station 406 can generate as described above in Figure 3 In some embodiments, the terminal device 400 obtains the SSB, PSS, and PBCH DMRS from each SSB in consecutive OFDM symbols. Each SSB occupies four OFDM symbols in the time domain and is distributed over 240 subcarriers in the frequency domain, such as Figure 3As shown. In order to obtain SSS, PSS, and PBCH DMRS, the terminal device 400 receives SSB from the base station 406 and / or the base station 408, and extracts SSS, PSS, and PBCH DMRS from the SSB. Then, cell measurement is performed based on the reference signal samples of SSS, PSS, and PBCH DMRS. In some embodiments, the number of reference signal samples is 398 (127 (PSS) + 127 (SSS) + 144 (DMRS) = 398). Since the amount of reference signal samples is increased in the application of the present disclosure, the accuracy of cell measurement can be improved. By improving the accuracy of cell measurement, erroneous switching or cell reselection decisions can be avoided. Therefore, the UE can quickly detect service cell quality issues when moving out of coverage, and quickly detect the switching target cell in the RRC connected state, or quickly detect the cell to be reselected in the RRC idle state. In addition, since reliable measurements can be obtained with a smaller number of measurement trials, UE battery power consumption can also be reduced.

[0047] In some embodiments, after the terminal device 400 obtains the SSS, PSS, and PBCH DMRS, the terminal device 400 may further obtain the physical layer cell identifier (PCI) of the base station 406 and / or the base station 408 based on the SSB. PCI is an identifier of a cell in the physical layer of the network, which is used to separate different senders. PCI is calculated by adding two different downlink synchronization signals PSS and SSS. In order to make the allocation conflict-free, there should not be any two adjacent cells sharing the same PCI on the same frequency. If the UE is to switch from one cell to another, and the source cell and the target cell share the same PCI, there is no clear way to notify the UE which cell it should switch to. Therefore, in wireless communication applications, different base stations have different PCIs.

[0048] When the terminal device 400 receives SSB from only one base station, the terminal device 400 should only obtain one PCI, and then the terminal device 400 will perform cell measurement based on the reference signal samples of the combination of SSS, PSS, and PBCH DMRS. Figure 4 When base station 406 and base station 408 shown receive SSB, terminal device 400 should obtain more than one PCI and will perform further determination.

[0049] In some embodiments, when it is determined that the SSB contains more than one PCI, the terminal device 400 may also determine the PSS sequence number of each PCI. According to the communication standard, the PSS consists of three different sequence numbers 0, 1, and 2, and the sequence number is obtained from the cell identifier of the base station. Therefore, the sequence numbers of different base stations may be different or the same. In the case where the PCIs of different base stations have the same PSS sequence number, the PSS may not be used for cell measurement due to PSS conflicts.

[0050] Figure 5 An exemplary determination operation of a PCI and a PSS sequence number according to some embodiments of the present disclosure is shown. In operation 502, SSB0 contains two different PCIs, namely PCI0 and PCI100. In other words, SSB0 is obtained from two different base stations. The base station with PCI0 uses PSS sequence 0, and the base station with PCI 100 uses PSS sequence 1. Therefore, there is no conflict, and this PSS can be used to perform cell measurement. In operation 504, SSB1 contains two different PCIs, namely PCI200 and PCI300. The base station with PCI 200 uses PSS sequence 2, and the base station with PCI300 uses PSS sequence 0. Therefore, in operation 504, there is also no conflict, and the PSS can be used to perform cell measurement. In operation 506, SSB2 contains two different PCIs, namely PCI0 and PCI300. The base station with PCI 0 and the base station with PCI 300 both use PSS sequence 0, thereby conflicting with each other. Therefore, the PSS cannot be used to perform cell measurement. In operation 508, SSB3 contains only one PCI, and a conflict determination process is not required, and the PSS can be used to perform cell measurement.

[0051] In some embodiments, when determining that the PSS sequence numbers of the two PCIs are different, the terminal device 400 may also detect the energy per resource unit (EPRE) value of the PSS and the EPRE value of the SSS. The base station determines the downlink transmission energy of each resource unit, and the UE may assume that the downlink cell-specific reference signal EPRE (including PSS EPRE and SSS EPRE) is constant over the downlink system bandwidth and constant over all subframes until different cell-specific reference signal power information is received. However, in some applications, the PSS transmit power may be different, in which case the PSS power must be offset before performing cell measurements.

[0052] The ratio of PSS EPRE to SSS EPRE in the SS / PBCH block is 0dB or 3dB. When the ratio of PSS EPRE to SSS EPRE is 0dB, the PSS power is the same as the SSS power and no offset is required. In this case, the PSS can be used together with the SSS and PBCH DMRS for cell measurement. However, when the PSS EPRE is about 3dB higher than the SSS EPRE, an offset of the PSS is required. After offsetting the PSS, the offset PSS can be used together with the SSS and PBCH DMRS to perform cell measurement. The offset of the PSS means reducing the PSS signal strength by 3dB.

[0053] Figure 6 6 shows a block diagram of a device 600 including a baseband chip 602, an RF chip 604, and a host chip 606 according to some embodiments of the present disclosure. The device 600 may be Figure 1 Examples of any suitable nodes of wireless network 100, such as Figure 1 The terminal device 102 or Figure 4 The terminal device 400 in FIG. Figure 6 As shown, the device 600 may include a baseband chip 602, an RF chip 604, a host chip 606, and one or more antennas 610. In some embodiments, the baseband chip 602 is composed of the above-mentioned Figure 2 The processor 202 and the memory 204 are implemented, and the RF chip 604 is implemented by the above Figure 2 The processor 202, memory 204 and transceiver 206 are implemented. The cell measurement scheme based on the combination of PSS, SSS, and PBCH DMRS disclosed in this article can be implemented as a PHY layer component of the baseband chip 602 of the device 600. Each chip 602, 604, or 606 may include an on-chip memory (also called "internal memory", for example, a register, a buffer, or a cache). As described in detail below, the on-chip memory of the baseband chip 602 can be used to cache reference signal samples in PSS, SSS, and PBCH DMRS to perform cell measurements. In addition to the on-chip memory on each chip 602, 604, or 606, the device 600 may also include an external memory 608 (for example, a system memory or a main memory), which can be shared by each chip 602, 604, or 606 through a system bus / main bus. Although in Figure 6 The baseband chip 602 is shown as an independent SoC, but it should be understood that, in one example, the baseband chip 602 and the RF chip 604 can be integrated into one SoC; in another example, the baseband chip 602 and the host chip 606 can be integrated into one SoC; in yet another example, as described above, the baseband chip 602, the RF chip 604, and the host chip 606 can be integrated into one SoC.

[0054] In the uplink, the host chip 606 can generate raw data and send the raw data to the baseband chip 602 for encoding, modulation and mapping. The baseband chip 602 can also access the raw data generated by the host chip 606 and stored in the external memory 608, for example, using direct memory access (DMA). The baseband chip 602 can first encode (for example, by source coding and / or channel coding) the raw data, and modulate the encoded data using any suitable modulation technology (for example, multi-phase pre-shared key (MPSK) modulation or orthogonal amplitude modulation (QAM)). The baseband chip 602 can perform any other functions, such as symbol mapping or layer mapping, to convert the raw data into a signal that can be used to modulate the carrier frequency for transmission. In the uplink, the baseband chip 602 can send the modulated signal to the RF chip 604. The RF chip 604 can convert the modulated signal in digital form into an analog signal, i.e., an RF signal, through a transmitter (Tx), and perform any appropriate front-end RF functions, such as filtering, up-conversion, or sampling rate conversion. Antenna 610 (eg, an antenna array) may transmit RF signals provided by a transmitter of RF chip 604 .

[0055] In the downlink, the antenna 610 can receive the RF signal and pass the RF signal to the receiver (Rx) of the RF chip 604. The RF chip 604 can perform any appropriate front-end RF functions, such as filtering, down-conversion, or sampling rate conversion, and convert the RF signal into a low-frequency digital signal (baseband signal) that can be processed by the baseband chip 602. In the downlink, the baseband chip 602 can demodulate and decode the baseband signal (including SSB) to extract the original data that can be processed by the host chip 606. The baseband chip 602 can perform additional functions such as error checking, demapping, channel estimation, descrambling, etc. The original data provided by the baseband chip 602 can be sent directly to the host chip 606 or stored in the external memory 608.

[0056] Figure 7 : is a block diagram of an exemplary baseband chip 700 for performing cell measurement based on a combination of PSS, SSS, and PBCH DMRS according to some embodiments of the present disclosure. The baseband chip 700 (e.g., Figure 6 The baseband chip 700 may include a physical (PHY) layer circuit 704 and a buffer 703. As described in detail below, the baseband chip 700 may include a physical (PHY) layer circuit 704 and a buffer 703. Figure 6The example of the RF chip 604 in the embodiment of the present invention can realize the cell measurement based on the combination of PSS, SSS, and PBCH DMRS disclosed in this article. In some embodiments, the baseband chip 700 and the transceiver 702 are integrated on a baseband SoC (also called a modem SoC or a baseband model chipset).

[0057] like Figure 7 As shown, the PHY layer circuit 704 may include, for example, a receiving module 706, an extracting module 708, a determining module 710, a detecting module 712, an offset module 714, and a cell measurement module 716. In some embodiments, each module 706, 708, 710, 712, 714, or 716 of the PHY layer circuit 704 is a dedicated integrated circuit (IC), such as an ASIC circuit, for performing the corresponding functions described in detail below. It should be understood that in some examples, one or more of the modules 706, 708, 710, 712, 714, and 716 of the PHY layer circuit 704 may be implemented as a software module running on a general-purpose processor (e.g., a microcontroller) on the baseband chip 700. In other words, the PHY layer circuit 704 may be replaced by a hybrid hardware and software module on the baseband chip 700. The buffer 703 may be part of the on-chip memory of the baseband chip 700.

[0058] The transceiver 702 may be configured to receive data from a network such as a base station (e.g., Figure 1 ) receives a signal from an access node 104 in an example. In some embodiments, the network is a 5G wireless network with NR. It should be understood that the wireless network is not limited to including NR, and may include any other suitable RAT, such as a global system for mobile communications (GSM) or a universal mobile telecommunications system (UMTS) for cellular networks, and Bluetooth or Wi-Fi for wireless local area networks (WLANs) and any suitable combination thereof. A terminal device having a baseband chip 700 and a transceiver 702 may be stationed on an NR cell of an NR base station (e.g., an eNB), and the transceiver 702 may communicate with an NR base station, for example, by receiving an SSB from the NR base station in an RRC connected state or in an RRC idle state.

[0059] The receiving module 706 may be configured to receive SSB from at least one base station. The receiving module 706 is configured to operate on the OFDM format to combine the advantages of quadrature amplitude modulation (QAM) and frequency division multiplexing (FDM) and produce a high-speed data rate communication system. The extraction module 708 may be configured, for example, based on the above description of Figure 3The arrangement of the PSS, SSS and PBCH DMRS in each SSB in the frequency domain and the time domain, extracting the PSS, SSS and PBCH DMRS from each SSB. In some embodiments, the receiving module 706 and the extraction module 708 may be two separate modules. In some embodiments, the receiving module 706 may include the extraction module 708. In some embodiments, the PSS, SSS and PBCH DMRS extracted from each SSB may be stored in the buffer 703 for operation in the cell measurement module 716. In some embodiments, the cell measurement module 716 may be configured to subsequently perform cell measurement based on a combination of the PSS, SSS and PBCH DMRS.

[0060] In some embodiments, the extraction module 708 can also be configured to extract the PCI of the at least one base station and the PSS sequence number of each PCI from the SSB, and the PHY layer circuit 704 can also include a determination module 710, which is used to determine whether the extracted PSS is suitable for cell measurement based on the extracted PCI and PSS sequence number.

[0061] The determination module 710 may be configured to determine whether the SSB contains more than one PCI. Since the receiving module 706 may receive the SSB from one or more base stations, the PCI is used as an identifier of a cell in the network physical layer, which is used to separate different senders. When the determination module 710 determines that only one PCI is included in the SSB, this means that the receiving module 706 receives the SSB from only one base station, so in this case, the cell measurement module 716 may be configured to perform cell measurement based on a combination of PSS, SSS, and PBCH DMRS.

[0062] In some embodiments, when the determination module 710 determines that more than one PCI is included in the SSB, this means that the receiving module 706 receives the SSB from more than one base station, and the determination module 710 may also be configured to determine whether the PSS sequence numbers of at least two PCIs are different. As described above, the PSS consists of three different sequence numbers 0, 1, and 2, and the sequence number is obtained from the cell identifier of the base station. When the determination module 710 determines that the PSS sequence numbers of different PCIs are the same, this means that the PSS conflicts and the PSS cannot be used to perform cell measurement. In some embodiments, when it is determined that the PSS sequence numbers of at least two PCIs are different, the cell measurement module 716 may be configured to perform cell measurement based on a combination of PSS, SSS, and PBCH DMRS.

[0063] In some embodiments, the PHY layer circuit 704 may further include a detection module 712 and an offset module 714 to further adjust the power of the PSS before performing cell measurements. The detection module 712 may be configured to detect a first EPRE value for the PSS and a second EPRE value for the SSS. The UE may assume that the downlink cell-specific reference signal EPRE (including PSS EPRE and SSSEPRE) is constant over the downlink system bandwidth and constant over all subframes until different cell-specific reference signal power information is received. However, in some applications, the PSS transmit power may be different, and the PSS power must be offset before performing cell measurements.

[0064] The ratio of PSS EPRE to SSS EPRE in the SS / PBCH block is 0 dB or 3 dB. When the detection module 712 detects that the ratio of PSS EPRE to SSS EPRE is about 0 dB, it means that the PSS power is the same as the SSS power, no offset is required, and the PSS can be used together with the SSS and PBCH DMRS to perform cell measurement. When the detection module 712 detects that the ratio of PSS EPRE to SSS EPRE is about 3 dB, it means that the PSS EPRE is about 3 dB higher than the SSS EPRE, and the PSS needs to be offset.

[0065] The offset module 714 may be configured to offset the signal strength of the PSS by 3 dB. Then, the cell measurement module 716 may be configured to perform cell measurement based on a combination of the offset PSS, SSS, and PBCH DMRS.

[0066] The cell measurement module 716 may be configured to perform cell measurement based on reference signal samples in the PSS (or offset PSS), SSS, and PBCH DMRS. For example, the cell measurement module 716 may perform cell measurement using 398 reference signal samples in the PSS (or offset PSS), SSS, and PBCH DMRS in each SSB.

[0067] Figure 8 800 for cell measurement based on PSS, SSS and PBCH DMRS according to some embodiments of the present disclosure. Examples of apparatuses that can perform the operations of method 800 include, for example Figure 1 The terminal device 102 and Figure 4 The terminal device 400 shown, and Figure 6 The baseband chip 602 and Figure 7The baseband chip 700 shown, or any other device disclosed herein. It should be understood that the operations shown in method 800 are not exhaustive, and other operations may be performed before, after, or between any of the operations shown. In addition, some operations may be performed simultaneously or in different order. Figure 8 It should be noted that the entire process of method 800 including operations 802, 804, 806, 808, 810, 812, 814, 816, 818, and 820 described below can be performed in an idle state or a connected state of the terminal device.

[0068] Reference Figure 8 , method 800 begins at operation 802, in which the terminal device obtains an SSB from at least one base station. In some embodiments, the terminal device receives the SSB from at least one base station. In some embodiments, the PHY layer of the terminal device receives the SSB from at least one base station. Figure 7 As shown, the receiving module 706 enables the terminal device to receive the SSB through the transceiver 702. The terminal device can obtain the SSB from one or more base stations connected to the terminal device. For example, the base station can be a NR base station, such as a NB.

[0069] Method 800 proceeds to operation 804, in which PSS, SSS and PBCH DMRS are extracted from the SSB received in operation 802. In some embodiments, the terminal device obtains PSS, SSS and PBCH DMRS from the base station. PSS, SSS and PBCH DMRS can be obtained together in consecutive OFDM symbols. Each SSB occupies 4 OFDM symbols in the time domain and is distributed over 240 subcarriers in the frequency domain. OFDM recognizes that band-limited orthogonal signals can be combined in a significantly overlapping manner while avoiding inter-channel interference. In some embodiments, using OFDM, an array of orthogonal subcarriers is created that work together to transmit information within a frequency range.

[0070] Method 800 proceeds to operation 806 and operation 808, as shown in FIG. Figure 8 As shown, the terminal device obtains the PCI of at least one base station based on the SSB received in operation 802, and determines whether the SSB contains more than one PCI. Since the terminal device can receive the SSB from one or more base stations, the PCI is used as an identifier of the cell in the network physical layer, and the PCI is obtained in operation 806. When operation 808 determines that the SSB contains only one PCI, it means that the terminal device receives the SSB from only one base station, and the method 800 can proceed to operation 820 to perform cell measurement based on a combination of PSS, SSS, and PBCH DMRS.

[0071] When operation 808 determines that the SSB contains more than one PCI, this means that the terminal device receives the SSB from more than one base station, and method 800 can proceed to operation 810 and operation 812. Operation 810 can obtain the PSS sequence number of each PCI, and operation 812 can also determine whether the PSS sequence numbers of the PCIs are different. The PSS consists of three different sequence numbers 0, 1, and 2, and the sequence number is obtained from the cell identifier of the base station. When operation 812 determines that the PSS sequence numbers of different PCIs are the same, this means that the PSS conflicts, the PSS cannot be used to perform cell measurement, and method 800 can proceed to operation 802 again.

[0072] When operation 812 determines that the PSS sequence numbers of at least two PCIs are different, method 800 can proceed to operations 814 and 816 to determine whether signal strength adjustment is required. Operation 814 detects a first EPRE value of the PSS and a second EPRE value of the SSS. The ratio of PSS EPRE to SSS EPRE in the SS / PBCH block is 0 dB or 3 dB. Operation 816 can determine whether the PSS EPRE is approximately 3 dB higher than the SSS EPRE or approximately equal to the SSS EPRE. When operation 816 determines that the PSS EPRE is approximately equal to the SSS EPRE, this means that the PSS power does not need to be adjusted, and method 800 can proceed to operation 820 to perform cell measurement based on a combination of PSS, SSS, and PBCH DMRS.

[0073] When operation 816 determines that the PSS EPRE is about 3 dB higher than the SSS EPRE, which means that the PSS power needs to be adjusted, the method 800 can proceed to operation 818 to offset the signal strength of the PSS. Operation 818 offsets the signal strength of the PSS by reducing the signal strength of the PSS by 3 dB. Then, operation 820 can perform cell measurement based on the combination of the offset PSS, SSS, and PBCH DMRS. It should be understood that in some examples, operation 820 may perform cell measurement based on 398 reference signal samples (127 (PSS) + 127 (SSS) + 144 (DMRS) = 398) to improve the accuracy of the cell measurement.

[0074] In various aspects of the present disclosure, the functions described herein may be implemented in hardware, software, firmware, or any combination thereof. If implemented in software, these functions may be stored on a non-transitory computer-readable medium, or encoded as instructions or codes on a non-transitory computer-readable medium. Computer-readable media include computer storage media. The storage medium may be any available medium accessible by a computing device. As an example and not limitation, such a computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or other optical disk storage, HDD (e.g., disk storage or other magnetic storage device), flash drive, SSD, or any other medium, which may be used to carry or store the desired program code in the form of an instruction or data structure and may be accessed by a processing system (e.g., a mobile device or a computer). The disks and optical disks used herein include CDs, laser disks, optical disks, DVDs, and floppy disks, wherein the disks typically reproduce data magnetically, and the optical disks reproduce data optically using lasers. The above combination should also be included within the scope of computer-readable media.

[0075] According to one aspect of the present disclosure, a terminal device includes at least one processor and a memory storing instructions. When the instructions are executed by the at least one processor, the terminal device obtains a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; obtains a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) of the SSB; and performs cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0076] In some embodiments, when the instructions are executed by the at least one processor, they also cause the terminal device to: obtain a physical layer cell identifier (PCI) of the at least one base station based on the SSB; when it is determined that the SSB contains more than one PCI, determine the PSS sequence number of each PCI; and when it is determined that the PSS sequence numbers of at least two PCIs are different, perform cell measurement based on the combination of the PSS, the SSS and the PBCH DMRS.

[0077] In some embodiments, the instructions, when executed by the at least one processor, further cause the terminal device to perform cell measurement based on a combination of the PSS, the SSS and the PBCH DMRS when determining that the SSB contains only one PCI.

[0078] In some embodiments, when the instructions are executed by the at least one processor, the terminal device also causes the terminal device to detect a first per-resource unit energy (EPRE) value of the PSS and a second EPRE value of the SSS when it is determined that the PSS sequence numbers of the two PCIs are different; when it is determined that the first EPRE value of the PSS is approximately 3dB higher than the second EPRE value of the SSS, offset the signal strength of the PSS by 3dB; and perform cell measurement based on a combination of the offset PSS, the SSS, and the PBCH DMRS.

[0079] In some embodiments, the instructions, when executed by the at least one processor, also cause the terminal device to: maintain the signal strength of the PSS when determining that the first EPRE value of the PSS is approximately equal to the second EPRE value of the SSS; and perform cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0080] In some embodiments, when the instructions are executed by the at least one processor, the terminal device reduces the signal strength of the PSS by 3 dB to offset the signal strength of the PSS by 3 dB.

[0081] According to one aspect of the present disclosure, a terminal device includes at least one processor and a memory storing instructions. When the instructions are executed by the at least one processor, the terminal device at least: obtains a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station; obtains a primary synchronization signal (PSS) of the SSB; obtains a physical layer cell identity (PCI) of the at least one base station based on the SSB; when it is determined that the SSB contains more than one PCI, determines the PSS sequence number of each PCI; and when it is determined that the PSS sequence numbers of at least two PCIs are different, performs cell measurement based on at least the PSS.

[0082] In some embodiments, when the instructions are executed by the at least one processor, the terminal device also causes: when it is determined that the PSS sequence numbers of at least two PCIs are different, to detect a first per-resource unit energy (EPRE) value of the PSS and a second EPRE value of the secondary synchronization signal (SSS); to compare the first EPRE value of the PSS with the second EPRE value of the SSS; when it is determined that the first EPRE value of the PSS is approximately 3dB higher than the second EPRE value of the SSS, to offset the signal strength of the PSS by 3dB; and to perform cell measurement based at least on the offset PSS.

[0083] In some embodiments, the instructions, when executed by the at least one processor, further cause the terminal device to: maintain the signal strength of the PSS when determining that the first EPRE value of the PSS is approximately equal to the second EPRE value of the SSS; and perform cell measurement based at least on the PSS.

[0084] According to another aspect of the present disclosure, a baseband chip includes a physical (PHY) layer circuit, which includes a receiving module, an extraction module, and a cell measurement module. The receiving module is configured to obtain a synchronization signal / physical broadcast channel (PBCH) block (SSB) from at least one base station. The extraction module is configured to extract a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) from the SSB. The cell measurement module is configured to perform cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0085] In some embodiments, the extraction module is further configured to extract a physical layer cell identifier (PCI) of the at least one base station and a PSS sequence number of each PCI from the SSB.

[0086] In some embodiments, the PHY layer circuit further includes a determination module, the determination module being configured to determine whether the SSB includes more than one PCI, and when it is determined that the SSB includes more than one PCI, determine whether the PSS sequence numbers of at least two PCIs are different. When it is determined that the PSS sequence numbers of at least two PCIs are different, the cell measurement module is configured to perform cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0087] In some embodiments, the PHY layer circuit further includes a detection module and an offset module. The detection module is configured to detect a first per-resource unit energy (EPRE) value of the PSS and a second EPRE value of the SSS when determining that the PSS sequence numbers of at least two PCIs are different. The offset module is configured to offset the signal strength of the PSS by 3 dB when the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS. The cell measurement module is configured to perform cell measurement based on a combination of the offset PSS, SSS, and PBCH DMRS.

[0088] According to another aspect of the present disclosure, a method for wireless communication implemented by a terminal device is disclosed. A synchronization signal / physical broadcast channel (PBCH) block (SSB) is obtained from at least one base station. A primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) of the SSB are obtained. Cell measurement is performed based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0089] In some embodiments, a physical layer cell identifier (PCI) of the at least one base station is obtained based on the SSB. It is determined whether the SSB contains more than one PCI. When it is determined that the SSB contains more than one PCI, a PSS sequence number of each PCI is obtained. It is determined whether the PSS sequence numbers of at least two PCIs are different. When it is determined that the PSS sequence numbers of at least two PCIs are different, a cell measurement is performed based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0090] In some embodiments, when it is determined that the PSS sequence numbers of the two PCIs are different, a first per resource unit energy (EPRE) value of the PSS and a second EPRE value of the SSS are detected. It is determined whether the first EPRE value of the PSS is about 3 dB higher than the second EPRE value of the SSS or is about equal to the second EPRE value of the SSS. When it is determined that the first EPRE value of the PSS is about 3 dB higher than the second EPRE value of the SSS, the signal strength of the PSS is offset by 3 dB. Cell measurement is performed based on a combination of the offset PSS, the SSS, and the PBCH DMRS.

[0091] According to another aspect of the present disclosure, a method for wireless communication implemented by a terminal device is disclosed. A synchronization signal / physical broadcast channel (PBCH) block (SSB) is obtained from at least one base station. A primary synchronization signal (PSS) of the SSB is obtained. A physical layer cell identifier (PCI) of the at least one base station is obtained based on the SSB. Determine whether the SSB contains more than one PCI. When it is determined that the SSB contains more than one PCI, determine the PSS sequence number of each PCI. When it is determined that the PSS sequence numbers of at least two PCIs are different, perform cell measurement based at least on the PSS.

[0092] In some embodiments, when it is determined that the PSS sequence numbers of at least two PCIs are different, a first per resource unit energy (EPRE) value of the PSS and a second EPRE value of a secondary synchronization signal (SSS) are detected. The first EPRE value of the PSS is compared with the second EPRE value of the SSS. When it is determined that the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, the signal strength of the PSS is offset by 3 dB. Cell measurement is performed based at least on the offset PSS.

[0093] According to another aspect of the present disclosure, a method implemented by a physical (PHY) layer circuit of a baseband chip is disclosed. A synchronization signal / physical broadcast channel (PBCH) block (SSB) is obtained from at least one base station. A primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH demodulation reference signal (DMRS) are extracted from the SSB. Cell measurement is performed based on a combination of the PSS, the SSS, and the PBCH DMRS.

[0094] In some embodiments, a physical layer cell identifier (PCI) of the at least one base station and a PSS sequence number of each PCI from the SSB are extracted. It is determined whether the SSB contains more than one PCI. When it is determined that the SSB contains more than one PCI, it is determined whether the PSS sequence numbers of at least two PCIs are different. When it is determined that the PSS sequence numbers of at least two PCIs are different, a first per resource unit energy (EPRE) value of the PSS and a second EPRE value of the SSS are detected. When the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, the signal strength of the PSS is offset by 3 dB. Cell measurements are performed based on a combination of the offset PSS, the SSS, and the PBCH DMRS.

[0095] The above description of the specific embodiments will reveal the general nature of the present disclosure, so that others can easily modify these specific embodiments and / or make these specific embodiments suitable for various applications without departing from the overall concept of the present disclosure by applying the knowledge within the art, without excessive experimentation. Therefore, based on the teachings and guidance provided herein, such adaptations and modifications are intended to be within the meaning and scope of the equivalents of the disclosed embodiments. It should be understood that the terms or wordings herein are for the purpose of description rather than limitation, so that the terms or wordings of this specification will be interpreted by those skilled in the art based on teachings and guidance.

[0096] The embodiments of the present disclosure have been described above with the aid of functional building blocks that illustrate the implementation methods of specified functions and their relationships. For ease of description, the boundaries of these functional building blocks are arbitrarily defined herein. Alternative boundaries may be defined as long as the specified functions and their relationships are properly performed.

[0097] The Summary and Abstract sections may set forth one or more, but not all, exemplary embodiments of the present disclosure as contemplated by the inventor(s), and thus, are not intended to limit the present disclosure and the appended claims in any way.

[0098] Various functional blocks, modules, and steps are disclosed above. The specific arrangements provided are illustrative, not restrictive. Therefore, functional blocks, modules, and steps may be reordered or combined in a manner different from the examples provided above. Likewise, specific embodiments include only a subset of functional blocks, modules, and steps, and any such subset is permitted.

[0099] The breadth and scope of the present disclosure should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims and their equivalents.

Claims

1. A terminal device, comprising: at least one processor; as well as A memory storing instructions, wherein when the instructions are executed by the at least one processor, the terminal device at least: Obtain a synchronization signal / physical broadcast channel PBCH block SSB from at least one base station; Obtain a primary synchronization signal PSS, a secondary synchronization signal SSS and a PBCH demodulation reference signal DMRS of the SSB; as well as performing cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS; Wherein, when the instruction is executed by the at least one processor, it further causes the terminal device to: Obtaining a physical layer cell identity PCI of the at least one base station based on the SSB; When it is determined that the SSB includes more than one PCI, determining a PSS sequence number for each PCI; as well as When it is determined that the PSS sequence numbers of at least two PCIs are different, the cell measurement is performed based on the combination of the PSS, the SSS, and the PBCH DMRS.

2. The terminal device according to claim 1, wherein: When the instructions are executed by the at least one processor, the terminal device further causes: When it is determined that the SSB includes only one PCI, the cell measurement is performed based on the combination of the PSS, the SSS, and the PBCH DMRS.

3. The terminal device according to claim 1, wherein: When the instructions are executed by the at least one processor, the terminal device further causes: When it is determined that the PSS sequence numbers of the two PCIs are different, detecting a first per-resource-unit energy EPRE value of the PSS and a second EPRE value of the SSS; When it is determined that the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, offsetting the signal strength of the PSS by 3 dB; and The cell measurement is performed based on a combination of the offset PSS, the SSS, and the PBCH DMRS.

4. The terminal device according to claim 3, wherein: When the instructions are executed by the at least one processor, the terminal device further causes: When determining that the first EPRE value of the PSS is approximately equal to the second EPRE value of the SSS, maintaining the signal strength of the PSS; and The cell measurement is performed based on a combination of the PSS, the SSS, and the PBCH DMRS.

5. The terminal device according to claim 3, wherein: When the instructions are executed by the at least one processor, the terminal device: The signal strength of the PSS is reduced by 3 dB to shift the signal strength of the PSS by 3 dB.

6. A terminal device, comprising: at least one processor; as well as A memory storing instructions, wherein when the instructions are executed by the at least one processor, the terminal device at least: Obtain a synchronization signal / physical broadcast channel PBCH block SSB from at least one base station; Obtain a primary synchronization signal PSS of the SSB; Obtaining a physical layer cell identity PCI of the at least one base station based on the SSB; When it is determined that the SSB includes more than one PCI, determining a PSS sequence number for each PCI; as well as When it is determined that the PSS sequence numbers of at least two PCIs are different, cell measurement is performed based on at least the PSS.

7. The terminal device according to claim 6, wherein: When the instructions are executed by the at least one processor, the terminal device further causes: When it is determined that the PSS sequence numbers of at least two PCIs are different, detecting a first per-resource unit energy EPRE value of the PSS and a second EPRE value of a secondary synchronization signal SSS; comparing the first EPRE value of the PSS with the second EPRE value of the SSS; When it is determined that the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, offsetting the signal strength of the PSS by 3 dB; and The cell measurement is performed based at least on the shifted PSS.

8. The terminal device according to claim 7, wherein: When the instructions are executed by the at least one processor, the terminal device further causes: When determining that the first EPRE value of the PSS is approximately equal to the second EPRE value of the SSS, maintaining the signal strength of the PSS; and The cell measurement is performed based at least on the PSS.

9. A baseband chip, comprising: A physical (PHY) layer circuit, the PHY layer circuit comprising: A receiving module configured to obtain a synchronization signal / physical broadcast channel PBCH block SSB from at least one base station; an extraction module configured to extract a primary synchronization signal PSS, a secondary synchronization signal SSS, and a PBCH demodulation reference signal DMRS from the SSB; and a cell measurement module, configured to perform cell measurement based on a combination of the PSS, the SSS and the PBCH DMRS; The extraction module is further configured to extract the physical layer cell identifier PCI of the at least one base station and the PSS sequence number of each PCI from the SSB; The PHY layer circuit further includes: a determination module configured to determine whether the SSB includes more than one PCI, and when it is determined that the SSB includes more than one PCI, determine whether the PSS sequence numbers of at least two PCIs are different, When it is determined that the PSS sequence numbers of at least two PCIs are different, the cell measurement module is configured to perform the cell measurement based on the combination of the PSS, the SSS and the PBCH DMRS.

10. The baseband chip according to claim 9, wherein: The PHY layer circuit further includes: a detection module configured to detect a first per-resource-unit energy EPRE value of the PSS and a second EPRE value of the SSS when it is determined that the PSS sequence numbers of at least two PCIs are different; and an offset module, configured to offset the signal strength of the PSS by 3 dB when the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, The cell measurement module is configured to perform the cell measurement based on a combination of the offset PSS, the SSS and the PBCH DMRS.

11. A method for wireless communication implemented by a terminal device, comprising: Obtain a synchronization signal / physical broadcast channel PBCH block SSB from at least one base station; Obtain a primary synchronization signal PSS, a secondary synchronization signal SSS and a PBCH demodulation reference signal DMRS of the SSB; as well as performing cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS; Also includes: Obtaining a physical layer cell identity PCI of the at least one base station based on the SSB; determining whether the SSB includes more than one PCI; When it is determined that the SSB includes more than one PCI, obtaining a PSS sequence number of each PCI; determining whether the PSS sequence numbers of at least two PCIs are different; and When it is determined that the PSS sequence numbers of at least two PCIs are different, the cell measurement is performed based on the combination of the PSS, the SSS, and the PBCH DMRS.

12. The method according to claim 11, further comprising: When it is determined that the PSS sequence numbers of the two PCIs are different, detecting a first per-resource-unit energy EPRE value of the PSS and a second EPRE value of the SSS; determining whether the first EPRE value of the PSS is approximately 3 dB greater than or approximately equal to the second EPRE value of the SSS; When it is determined that the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, offsetting the signal strength of the PSS by 3 dB; and The cell measurement is performed based on a combination of the offset PSS, the SSS, and the PBCH DMRS.

13. A method for wireless communication implemented by a terminal device, comprising: Obtain a synchronization signal / physical broadcast channel PBCH block SSB from at least one base station; Obtain a primary synchronization signal PSS of the SSB; Obtaining a physical layer cell identity PCI of the at least one base station based on the SSB; determining whether the SSB includes more than one PCI; When it is determined that the SSB includes more than one PCI, determining a PSS sequence number for each PCI; as well as When it is determined that the PSS sequence numbers of at least two PCIs are different, cell measurement is performed based on at least the PSS.

14. The method according to claim 13, after determining the PSS sequence number of each PCI, further comprising: When it is determined that the PSS sequence numbers of at least two PCIs are different, detecting a first per-resource-unit energy EPRE value of the PSS and a second EPRE value of a secondary synchronization signal (SSS); comparing the first EPRE value of the PSS with the second EPRE value of the SSS; When it is determined that the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, offsetting the signal strength of the PSS by 3 dB; and The cell measurement is performed based at least on the shifted PSS.

15. A method implemented by a physical PHY layer circuit of a baseband chip, comprising: Obtain a synchronization signal / physical broadcast channel PBCH block SSB from at least one base station; Extracting a primary synchronization signal PSS, a secondary synchronization signal SSS and a PBCH demodulation reference signal DMRS from the SSB; as well as performing cell measurement based on a combination of the PSS, the SSS, and the PBCH DMRS; Also includes: Extracting the physical layer cell identity PCI of the at least one base station and the PSS sequence number of each PCI from the SSB; determining whether the SSB includes more than one PCI; When it is determined that the SSB includes more than one PCI, determining whether PSS sequence numbers of at least two PCIs are different; When it is determined that the PSS sequence numbers of at least two PCIs are different, the cell measurement is performed based on a combination of the PSS, the SSS, and the PBCH DMRS.

16. The method according to claim 15, further comprising: When it is determined that the PSS sequence numbers of at least two PCIs are different, detecting a first per-resource-unit energy EPRE value of the PSS and a second EPRE value of the SSS; When the first EPRE value of the PSS is approximately 3 dB higher than the second EPRE value of the SSS, the signal strength of the PSS is shifted by 3 dB.

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