Joint detection of the primary synchronization signal (PSS) and other synchronization signal symbols in target cell search.

Abstract

This disclosure relates to the joint detection of a primary synchronization signal (PSS) and other synchronization signal symbols in target cell search. Aspects of this disclosure describe a user equipment (UE) including a transceiver configured to enable wireless communication with a serving cell and a processor communicatively coupled to the transceiver. The processor is configured to determine a reference signal sequence including a primary synchronization signal (PSS) sequence and a secondary synchronization signal (SSS) sequence of a target cell. The processor is further configured to receive the signal sequence from the target cell and calculate a total correlation value based on the reference signal sequence and the received signal sequence. The processor is further configured to determine that the total correlation value is higher than a threshold and detect a synchronization signal block (SSB) of the target cell based on the received signal sequence. Finally, the processor is configured to establish a radio connection with the target cell based on the SSB.

Description

Technical Field

[0001] The aspects described typically relate to target cell search in wireless communication systems. Summary of the Invention

[0002] Some aspects of this disclosure relate to a user equipment (UE) including a transceiver and a processor communicatively coupled to the transceiver. The processor is configured to determine a reference signal sequence including a first-level synchronization sequence and a second-level synchronization sequence of a target cell. The processor is further configured to receive the signal sequence from the target cell and calculate a total correlation value based on the reference signal sequence and the received signal sequence. The processor is further configured to determine whether the total correlation value exceeds a threshold, and based on the total correlation value exceeding the threshold, detect a synchronization signal of the target cell based on the received signal sequence. Finally, the processor is configured to establish a radio connection with the target cell based on the synchronization signal.

[0003] Some aspects of this disclosure relate to a method for operating a UE connected to a target cell. The method includes determining a reference signal sequence comprising a first-level synchronization sequence and a second-level synchronization sequence of the target cell. The method further includes receiving a signal sequence from the target cell, and calculating a total correlation value based on the reference signal sequence and the received signal sequence. The method further includes determining whether the total correlation value exceeds a threshold, and detecting a synchronization signal of the target cell based on the received signal sequence if the total correlation value exceeds the threshold. Finally, the method includes establishing a connection with the target cell based on the synchronization signal.

[0004] Some aspects of this disclosure relate to a non-transitory computer-readable medium (CRM) including instructions for causing the UE to perform operations when executed by one or more processors of the UE. The operations include determining a reference signal sequence comprising a first-level synchronization sequence and a second-level synchronization sequence of a target cell. The operations also include receiving a signal sequence from the target cell and calculating a total correlation value based on the reference signal sequence and the received signal sequence. The operations further include determining whether the total correlation value exceeds a threshold, and detecting a synchronization signal of the target cell based on the received signal sequence if the total correlation value exceeds the threshold. Finally, the operations include establishing a connection with the target cell based on the synchronization signal.

[0005] The content of this invention is provided for illustrative purposes only, to provide an understanding of the subject matter described herein. Therefore, the features described above are merely illustrative and should not be construed as narrowing the scope or substance of the subject matter of this disclosure. Other features, aspects, and advantages of this disclosure will become apparent from the following detailed description, the accompanying drawings, and the claims. Attached Figure Description

[0006] The accompanying drawings, which are incorporated herein and form part of this specification, illustrate the present disclosure and, together with the specification, further serve to explain the principles of the disclosure and enable those skilled in the art to make and use the disclosure.

[0007] Figure 1 An exemplary system for achieving target cell search using joint detection according to some aspects of this disclosure is shown.

[0008] Figure 2 A block diagram of an exemplary system of an electronic device for target cell search according to some aspects of this disclosure is shown.

[0009] Figure 3 An exemplary synchronization signal block (SSB) signal according to various aspects of this disclosure is shown.

[0010] Figure 4 Exemplary methods for target cell search according to various aspects of this disclosure are shown.

[0011] Figure 5 Exemplary methods for joint detection according to various aspects of this disclosure are shown.

[0012] Figure 6 Exemplary methods for calculating combined correlation values ​​according to various aspects of this disclosure are shown.

[0013] Figure 7 An exemplary computer system for implementing some aspects or parts thereof is shown.

[0014] This disclosure is described with reference to the accompanying drawings. In the drawings, the same reference numerals generally denote the same or similarly functional elements. Additionally, the leftmost numeral of the reference numerals generally appears first in the drawings. Detailed Implementation

[0015] Some aspects of this disclosure include apparatus and methods for performing target cell search using joint detection with 3GPP Release 15 (Rel-15), Release 16 (Rel-16), Release 17 (Rel-17), and / or other 3GPP releases. For example, systems and methods are provided for performing joint detection based on the Primary Synchronization Signal (PSS) and other synchronization signal symbols such as Synchronization Signal Block (SSB) symbols.

[0016] In some aspects, the User Equipment (UE) operates according to New Radio (NR) for Digital Cellular Networks as defined by 3GPP Version 15 (Rel-15), Version 16 (Rel-16), and / or Version 17 (Rel-17) and / or 5G Radio Technology, and the UE may support cell search. For example, the UE performs a cell search to establish a radio connection with a cell. The cell search can be an initial cell search or a targeted cell search. In some aspects, the UE does not connect to any cell. For example, the UE is powered on or has previously lost connection. The UE performs an initial cell search to connect to a cell (such as the serving cell). The UE detects synchronization signals, such as SSBs, transmitted by the serving cell to establish a connection with the serving cell. In some aspects, the SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH) signal, wherein the PBCH signal includes a PBCH Demodulation Reference Signal (PBCH DMRS) and a PBCH payload. The UE determines the timing of a synchronization signal (such as an SSB) based on a first-level synchronization sequence (such as a PSS reference sequence) included in the synchronization signal. In some aspects, the UE determines the correlation value between the PSS reference sequence and the received signal. If the correlation value is higher than a predetermined threshold, the UE determines that the received signal corresponds to the synchronization signal and establishes a connection with the serving cell based on the synchronization signal. For example, the UE uses the PSS to perform time and frequency synchronization with the serving cell. The UE also relies on the SSS to detect the physical cell ID (PCID) of the serving cell. Subsequently, the UE determines the PBCH DMRS and decodes the PBCH payload, which the UE can use to receive and decode other information (such as the serving cell's Master Information Block (MIB)) to establish a connection with the serving cell.

[0017] In some respects, the UE can perform target cell search. The UE connects to the serving cell and identifies additional neighboring cells, such as the target cell, to connect to. For example, the UE may be at a cell boundary and need to hand over to connect to the target cell. The UE can also connect to the target cell as a secondary cell in dual-connectivity mode. In both cases, the UE determines the timing of the target cell's synchronization signal (such as the SSB) based on a first-level synchronization sequence (such as a PSS reference sequence), a second-level synchronization sequence (such as an SSS reference sequence), and additional information about the target cell (such as a PBCH DMRS sequence or a cell-specific reference sequence (CRS)). For example, the UE determines the correlation value between the received signal and a combination of the PSS reference sequence, SSS reference sequence, and PBCH DMRS sequence. If the correlation value is higher than a predetermined threshold, the UE determines that the received signal corresponds to the target cell's SSB and connects to the target cell based on the received signal. Therefore, in target cell search, the UE has more information about neighboring cells, making the neighboring cells the target cells. In some respects, the serving cell transmits a configuration message to the UE. The configuration message indicates the PSS reference sequence, SSS reference sequence, and PBCH DMRS sequence. In other aspects, the UE determines the correlation value between the received signal and the combination of the PSS reference sequence, SSS reference sequence, and CRS sequence. If the correlation value is higher than a predetermined threshold, the UE determines that the received signal corresponds to the synchronization signal of the target cell and connects to the target cell based on the received signal. In some aspects, the second-level synchronization sequence and additional information are not available during the initial cell search.

[0018] Figure 1An exemplary system 100 is shown, illustrating a design for target cell search using joint detection according to some aspects of this disclosure. The exemplary system 100 is provided for illustrative purposes only and is not intended to limit the aspects disclosed. System 100 may include, but is not limited to, UE 102, base station 106, base station 110, cell 104, and cell 108. UE 102 and base stations 106 and 110 may be implemented as electronic devices configured to operate based on a variety of wireless communication technologies. These technologies may include, but are not limited to, technologies based on 3GPP standards. For example, UE 102 may include electronic devices configured to operate using one or more 3GPP versions, such as version 15 (Rel-15), version 16 (Rel-16), version 17 (Rel-17), or other 3GPP versions. UE 102 may include, but is not limited to, wireless communication devices, smartphones, laptops, desktop computers, tablets, personal assistants, monitors, televisions, wearable devices, Internet of Things (IoT) devices, vehicle communication devices, etc. Base stations 106 and 110 may include one or more nodes configured to operate based on a variety of wireless communication technologies, such as, but not limited to, technologies based on 3GPP standards.

[0019] In some aspects, base station 106 supports cell 104. UE 102 establishes a connection with cell 104 via base station 106, such as connection 112. Cell 104 may be the serving cell of UE 102, and the attempt by UE 102 to connect with the serving cell is also referred to as initial cell search. For example, UE 102 establishes a connection with cell 104 based on the SSB signal of cell 104 received from base station 106. In some aspects, UE 102 searches for the time position of the SSB signal based on a first-level synchronization sequence (such as one or more PSS reference sequences). For example, UE 102 calculates one or more correlation values ​​between each of the one or more PSS reference sequences and the first symbol of the signal received from base station 106. UE 102 may determine that one of the one or more correlation values ​​is above a threshold. In such a case, UE 102 determines that the SSB signal begins at the first symbol of the received signal, and thus determines the time position of the SSB signal. In some aspects, the first-level synchronization sequence is available to UE 102 during the initial cell search. For example, UE 102 determines and stores first-level synchronization sequences, such as one or more PSS reference sequences, based on standards such as 3GPP standards. In other respects, UE 102 receives first-level synchronization sequences, such as one or more PSS reference sequences, from base stations to which UE 102 is previously connected.

[0020] In some aspects, UE 102 may determine that one or more correlation values ​​between one or more PSS reference sequences and the first symbol of the signal received from base station 106 are all below a threshold. Then, UE 102 determines that the received signal does not match the SSB signal. In such a case, UE 102 receives additional signals and calculates one or more correlation values ​​based on the additional signals received as described above. In some aspects, UE 102 searches for the SSB signal within a search window. When UE 102 performs an initial cell search, the size of the search window may be predetermined, such as 20 ms.

[0021] In some respects, base station 110 supports cell 108. UE 102 can establish a connection with cell 108 via base station 110 (such as connection 114). In some respects, UE 102 connects to cell 108 during a handover process. For example, UE 102 is on the boundary between cell 104 and cell 108. UE 102 can also move away from cell 104 and towards cell 108. Therefore, the signal strength received by the UE in cell 104 drops below a predetermined threshold, and UE 102 needs to establish a new connection with a new base station, such as connection 114 with base station 110. In other respects, UE 102 connects to cell 108 in dual-connectivity mode. In other words, UE 102 connects to cell 108 via connection 114 and maintains connection 112 with cell 104. In both cases, cell 108 is the target cell, and the attempt by UE 102 to connect to the target cell is also called a target cell search. In a target cell search, more information is provided to UE 102. For example, in addition to a first-level synchronization sequence (such as a PSS reference sequence), UE 102 also has a second-level synchronization sequence (such as an SSS reference sequence) and additional information (such as PBCH-DMRS sequence information or CRS for cell 108). For example, a base station of the serving cell (such as base station 106) transmits a configuration message to UE 102, wherein the configuration message includes information indicating the first-level synchronization sequence, the second-level synchronization sequence, and additional information for cell 108. In some aspects, the serving cell (such as base station 106) transmits the configuration message via Radio Resource Control (RRC) transmission.

[0022] In some aspects, UE 102 determines the timing of the SSB signal in cell 108 based on the PSS reference sequence, SSS reference sequence, and PBCH-DMRS. UE 102 can determine the PBCH-DMRS sequence based on PBCH-DMRS sequence information. In some aspects, the PBCH-DMRS sequence information includes the SSB index of cell 108. UE 102 can calculate the PBCH-DMRS sequence based on the SSB index. In some aspects, UE 102 can determine the SSB index of cell 108 based on the SSB index of cell 104. In other words, UE 102 can determine the PBCH-DMRS sequence based on the SSB index of cell 104. Once UE 102 obtains the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence of cell 108, UE 102 calculates the correlation value between the signal received from base station 110 and the combination of the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence. If the correlation value is higher than the threshold, UE 102 determines that the first symbol of the signal received from base station 110 corresponds to the SSB signal of cell 108, and thus determines the time position of the SSB signal.

[0023] In some respects, UE 102 may determine that the correlation value is below a threshold. Then, UE 102 determines that the received signal does not correspond to the SSB signal of cell 108. In such a case, UE 102 receives additional signals from base station 110 and calculates additional correlation values ​​based on the additional signals received in a similar manner as described above. In some respects, UE 102 searches for SSB signals within a search window. When UE 102 performs a target cell search, the size of the search window can be predetermined, such as 5 ms.

[0024] In some respects, the detection rate of the SSB signal corresponds to the length of the combined reference sequence. For example, as mentioned above, the target cell search uses a combination of the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence of cell 108, and the initial target cell search uses the PSS reference sequence of cell 104. Because the target cell search uses a longer reference sequence, it has a higher detection rate compared to the initial cell search. In some respects, UE 102 can use a combination of the PSS reference sequence and SSS reference sequence to perform the target cell search without the PBCH-DMRS sequence. In this case, the detection rate will be lower than when UE 102 uses a combination of the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence to perform the target cell search.

[0025] Figure 2A block diagram of an exemplary system 200 of an electronic device implementing joint detection according to some aspects of this disclosure is shown. System 200 can be any electronic device (e.g., UE 102) of the electronic device of system 100. System 200 includes a processor 210, one or more transceivers 220, communication infrastructure 240, memory 250, operating system 252, application 254, device capabilities 256, and one or more antennas 260. The illustrated system is provided as an exemplary part of system 200, and system 200 may include other circuitry and subsystems. Furthermore, although the system of system 200 is shown as separate components, aspects of this disclosure may include any combination of these components, fewer components, or more components.

[0026] Memory 250 may include random access memory (RAM) and / or cache, and may include control logic (e.g., computer software) and / or data. Memory 250 may include other storage devices or memories. According to some examples, operating system 252 may be stored in memory 250. Operating system 252 may manage data transfer from memory 250 and / or the one or more applications 254 to processor 210 and / or the one or more transceivers 220. In some examples, operating system 252 holds one or more network protocol stacks (e.g., Internet Protocol stack, cellular protocol stack, etc.) that may include multiple logical layers. At the corresponding layer of the protocol stack, operating system 252 includes control mechanisms and data structures to perform the functions associated with that layer.

[0027] According to some examples, application 254 may be stored in memory 250. Application 254 may include applications used by the wireless system 200 and / or users of the wireless system 200 (e.g., user applications). Applications in application 254 may include applications such as, but not limited to, Siri. TM FaceTime TM Wireless streaming, video streaming, remote control, and / or other user applications. In some aspects, device capabilities 256 may be stored in memory 250. For example, device capabilities 256 include computational complexity capabilities, processing speed, and other capabilities.

[0028] System 200 may also include communication infrastructure 240. Communication infrastructure 240 provides communication between, for example, processor 210, one or more transceivers 220, and memory 250. In some embodiments, communication infrastructure 240 may be a bus.

[0029] Processor 210, either alone or in conjunction with instructions stored in memory 250, enables system 200 of system 100 to perform joint cell detection operations, as described herein. Alternatively or otherwise, processor 210 may be "hard-coded" to implement mechanisms for joint cell detection for target cell search, as described herein.

[0030] One or more transceivers 220 transmit and receive communication signals supporting mechanisms for joint cell detection used in target cell search. Additionally, the one or more transceivers 220 transmit and receive communication signals supporting mechanisms for measuring communication links, generating and transmitting system information, and receiving system information. According to some aspects, the one or more transceivers 220 may be coupled to an antenna 260 to wirelessly transmit and receive these communication signals. The antenna 260 may include one or more antennas, which may be the same or different types. The one or more transceivers 220 allow system 200 to communicate with other devices, which may be wired and / or wireless. In some examples, the one or more transceivers 220 may include a processor, controller, radio component, socket, plug, buffer, and similar circuitry / devices for connecting to and communicating over a network. According to some examples, the one or more transceivers 220 include one or more circuitry for connecting to and communicating over wired and / or wireless networks.

[0031] According to some aspects of this disclosure, the one or more transceivers 220 may include a cellular subsystem, a WLAN subsystem, and / or Bluetooth. TM Each subsystem includes its own radio transceiver and protocol, as those skilled in the art will understand based on the discussion provided herein. In some specific implementations, the one or more transceivers 220 may include more or fewer systems for communicating with other devices.

[0032] In some examples, the one or more transceivers 220 may include one or more circuits (including WLAN transceivers) for enabling connectivity and communication via a WLAN network (such as, but not limited to, networks based on the standards described in IEEE 802.11).

[0033] Additionally or alternatively, the one or more transceivers 220 may include features for implementing, for example, Bluetooth-based... TM Protocol, Bluetooth TM Low power protocol or Bluetooth TM One or more circuits for low-power remote protocol connectivity and communication (including Bluetooth) TM (Transceiver). For example, transceiver 220 may include Bluetooth. TM Transceiver.

[0034] Additionally, the one or more transceivers 220 may include one or more circuits (including cellular transceivers) for connecting to and communicating on a cellular network. The cellular network may include, but is not limited to, 3G / 4G / 5G networks, such as Universal Mobile Telecommunications System (UMTS), Long Term Evolution (LTE), etc. For example, the one or more transceivers 220 may be configured to operate according to one or more of the 3GPP standards Rel-15, Rel-16, Rel-17, or other versions.

[0035] The following text is about Figures 3 to 7 As discussed in more detail, processor 210 can implement different mechanisms for joint detection, such as those related to... Figure 1 The system discussed in System 100.

[0036] Figure 3 An exemplary SSB signal 300 is shown. For convenience and not limitation, see [reference needed]. Figure 1 , Figure 2 and Figure 7 Element description Figure 3 For example, base stations (such as...) Figure 1 (Base stations 106 and 110) Figure 2 System 200 or Figure 7 The computer system 700 can transmit Figure 3 The SSB signal 300 is shown. UE (such as...) Figure 1 UE 102) Figure 2 System 200 or Figure 7 The computer system 700 can receive Figure 3 The SSB signal shown.

[0037] In some aspects, the SSB signal 300 includes four symbols, such as symbols 302, 304, 306, and 308. Symbols 302, 304, 306, and 308 may be orthogonal frequency division multiplexing (OFDM) symbols. In some aspects, the first symbol of the SSB signal (such as symbol 302) includes information corresponding to the PSS reference sequence. For example, UE 102 can decode symbol 302 and convert symbol 302 into the PSS reference sequence. The second, third, and fourth symbols, such as symbols 304, 306, and 308, include information corresponding to the PBCH sequence, which includes the PBCH payload and the PBCH-DMRS sequence. UE 102 can decode and convert a portion of symbols 304, 306, and 308 to obtain the PBCH sequence. The third symbol (such as symbol 306) also includes information corresponding to the SSS reference sequence. UE 102 can decode symbol 306 and convert it into the SSS reference sequence. UE 102 can distinguish the PBCH portion and the SSS portion of symbol 306 by frequency. For example, the SSS portion of symbol 306 occupies 127 subcarriers around the center frequency. The PBCH portion of symbol 306 includes a top portion and a bottom portion relative to the center frequency, each of which may occupy 48 subcarriers. In some aspects, the first symbol (such as symbol 302) occupies 127 subcarriers. The second and fourth symbols (such as symbols 304 and 308) occupy 240 subcarriers.

[0038] In some aspects, base stations (such as base stations 106 and 110) transmit SSB signals to UE 102 in synchronization signal (SS) burst sets. An SS burst set includes one or more SSB signals. In some aspects, the SSB signal L in an SS burst set... MAX The maximum number depends on the subcarrier spacing (SCS). For example, if the SCS is 15 kHz or 30 kHz, then L MAX = 4 or 8. If SCS is 120kHz or 240kHz, then L MAX =64. In some respects, the SCS depends on the carrier frequency. For example, if the carrier frequency is below 6 GHz, the SCS is 15 kHz or 30 kHz. If the carrier frequency is above 6 GHz, the SCS is 120 kHz or 240 kHz. In some respects, the SS burst set occurs within a predetermined time period, such as 5 ms. The predetermined time period can be the search window for the target cell search discussed above and below. In other words, UE 102 searches for SSB signals within a predetermined time period during the target cell search.

[0039] In some respects, base stations (such as base stations 106 and 110) periodically transmit SS burst sets. For example, when UE 102 establishes a connection 112 with base station 106, the base station transmits an SS burst set every 20ms during initial access. Once a connection 112 is established between UE 102 and base station 106, base station 106 can also configure the periodicity of the SS burst sets to other values, such as 5ms, 10ms, 40ms, 80ms, and 160ms.

[0040] In some respects, symbol 302 corresponds to one of the three PSS reference sequences representing three group IDs. In some respects, UE 102 determines and stores the three PSS reference sequences based on standards such as 3GPP standards. In other respects, UE 102 receives the three PSS reference sequences from a base station to which UE 102 is previously connected. In the initial search, UE 102 determines the time position of the SSB signal transmitted by base station 106 based on three possible PSS reference sequences previously stored by UE in memory (such as memory 256). For example, UE 102 receives a signal from base station 106, wherein the received signal comprises one or more symbols. UE 102 converts the first symbol of the received signal into an in-phase / quadrature (I / Q) sample sequence. UE 102 then calculates the correlation value, such as the cross-correlation value, between the I / Q sample sequence and each of the three possible PSS reference sequences. If the first symbol of the received signal is the first symbol of the SSB signal, such as symbol 302, then the I / Q sample sequence will correspond to one of the three possible PSS reference sequences. In this situation, at least one relevant value will be higher than the threshold. Then, UE 102 determines that the first symbol of the received signal is the first symbol of the SSB signal, such as symbol 302. Because the other three symbols of the SSB signal (such as symbols 304, 306, and 308) follow symbol 302, as... Figure 3 As shown, UE 102 can determine that the three symbols following the first symbol of the received signal are the second, third, and fourth symbols of the SSB signal. In this case, UE 102 obtains the SSB signal and can use the SSB signal to establish a connection with base station 106.

[0041] However, the first symbol of the received signal may not be the first symbol of the SSB signal. In such a case, UE 102 determines that all correlation values ​​are below a threshold. UE 102 then continues searching for the SSB signal. In some aspects, UE 102 delays the first symbol by one I / Q sample and checks whether the delayed first symbol of the received signal is the first symbol of the SSB signal in a manner similar to that described above for the first symbol. For example, UE 102 removes the first I / Q sample of the first symbol and concatenates the I / Q samples following the first symbol to form the delayed first symbol of the received signal. Because UE 102 continues to receive symbols from base station 106, UE 102 checks each received symbol until the SSB is located. In some aspects, UE 102 searches for the SSB signal within a search window of 20 ms.

[0042] In some aspects, during target cell search, when UE 102 attempts to connect to cell 108 via base station 110, UE 102 has more information. For example, during the initial cell search, UE 102 knows three possible PSS reference sequences. During the target cell search, UE 102 knows the specific PSS reference sequence corresponding to symbol 302. Therefore, during the target cell search, UE 102 checks the symbols received from the target cell (such as cell 108) by calculating the correlation value between the received symbols and the specific PSS reference sequence. In some aspects, the base station of the serving cell (such as base station 106) provides UE 102 with information about the specific PSS reference sequence corresponding to cell 108 via a configuration message. For example, the configuration message may include the cell ID of the target cell, such as cell 108. UE 102 can derive the specific PSS reference sequence from the cell ID of the target cell using modulo operations (such as mod(cell_ID,3)). In one aspect, the specific PSS reference sequence is an M-sequence of length 127. Specific PSS reference sequences can also be generated using binary phase shift keying (BPSK).

[0043] In some aspects, UE 102 can also derive the SSS reference sequence for cell 108 based on the cell ID of the target cell, which is received from base station 106 via a configuration message. For example, UE 102 can derive the SSS reference sequence for cell 108 as described in relevant technical standard documents, such as section 7.4.2.3 of TS 38.211 developed by 3GPP. In one aspect, similar to the PSS reference sequence, the SSS reference sequence is also an M-sequence of length 127 and can be generated using BPSK. UE 102 can use both the PSS reference sequence and the SSS reference sequence to search for SSB signals. For example, UE 102 receives a signal comprising one or more symbols from base station 108. UE 102 checks whether the first and third symbols of the received signal correspond to symbols 302 and 306 of the SSB signal. UE 102 converts the first and third symbols of the received signal into a combined sequence. For example, UE 102 converts the first and second symbols into a first I / Q sample sequence and a second I / Q sample sequence, respectively. UE 102 then connects the first I / Q sample sequence and the second I / Q sample sequence to form a combined sequence. UE 102 also connects the PSS reference sequence and the SSS reference sequence to form a combined reference sequence. Finally, UE 102 calculates the total correlation value between the combined sequence and the combined reference sequence. If the total correlation value is higher than a threshold, UE 102 determines that the first and third symbols of the received signal correspond to symbols 302 and 306 of the SSB signal. Based on this, UE 102 also determines the second and fourth symbols of the received signal that correspond to symbols 304 and 308 of the SSB signal. Therefore, UE 102 locates the SSB signal and can use the SSB signal as described above to establish a connection 114 with cell 108 via base station 110.

[0044] In some aspects, UE 102 calculates correlation values ​​without combining the first and third symbols of the received signal. For example, UE 102 may calculate a first correlation value between the first symbol of the received signal and the PSS reference sequence, and calculate a second correlation value between the third symbol of the received signal and the SSS reference sequence. In some aspects, UE 102 delays the received signal by a predetermined symbol duration and calculates a second correlation value between the delayed received signal and the SSS reference sequence. In some aspects, the predetermined symbol duration is a two-symbol duration, as defined in NR of the 5G radio standard. In other aspects, the predetermined symbol duration can be other durations, such as a single symbol duration. The predetermined symbol duration can also be negative. For example, the SSS reference sequence can be located in symbols preceding the PSS sequence. In such cases, instead of delaying the received signal, UE 102 examines one or more symbols that precede the received signal in time, such as symbols received before the received signal. For example, the predetermined symbol duration can be a negative symbol duration. The UE examines symbols preceding the received signal and calculates a second correlation value between symbols preceding the received signal and the SSS reference sequence. In some respects, UE 102 stores symbols received prior to the received signal. UE 102 then coherently or incoherently combines a first correlation value and a second correlation value. For example, UE 102 incoherently combines them by adding the absolute values ​​of the first and second correlation values. In another example, UE 102 coherently combines them by directly adding the first and second correlation values, where the first and second correlation values ​​can be complex or real numbers.

[0045] In some aspects, UE 102 may determine that the total correlation value is below a threshold. In such cases, UE 102 may continue searching for the received signal in a moving window pattern. For example, UE 102 delays the first symbol of the received signal by one I / Q sample to obtain the second symbol of the received signal, as described above. Therefore, the second symbol of the received signal moves up to the position of the first symbol, and all other symbols following the first symbol are delayed by one I / Q sample in the same manner. In other words, the received signal is delayed for one I / Q sample duration. Then, UE 102 repeats the above process based on the delayed received signal to search for the SSB signal. In some aspects, UE 102 searches for the SSB signal within a search window. For example, UE 102 performs the above-described moving window pattern search within the search window. In some aspects, the search window is periodic. For example, the search window may be a 5ms period that repeats every 20ms.

[0046] In some aspects, the configuration message received by UE 102 from base station 106 may also include PBCH-DMRS sequence information corresponding to the PBCH-DMRS sequence. In one aspect, the PBCH-DMRS sequence information includes the SSB index of cell 108. UE 102 may determine the PBCH-DMRS sequence of cell 108 based on the SSB index and cell ID of cell 108, wherein the cell ID of cell 108 may be derived by UE 102 from the configuration message, as described above. UE 102 may also determine the SSB index of cell 108 based on the SSB index of cell 104, since cell 104 and cell 108 are adjacent cells. The SSB index of cell 104 may be included in the configuration message or delivered to UE 102 via other transmissions through base station 106. In some aspects, the PBCH-DMRS sequence is a pseudo-random sequence of length 144. Quadrature Phase Shift Keying (QPSK) may be used to generate the PBCH-DMRS sequence.

[0047] In some aspects, UE 102 can use the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence to search for SSB signals. For example, UE 102 can calculate the first I / Q sample sequence and the second I / Q sample sequence in a manner similar to that described above. UE 102 can also calculate the third I / Q sample sequence corresponding to the PBCH-DMRS sequence based on the second, third, and fourth symbols of the received signal. This is because if the first four symbols of the received signal correspond to the SSB signal, UE 102 can extract the PBCH-DMRS sequence based on the second, third, and fourth symbols of the received signal. In other words, UE 102 treats the first four symbols of the received signal as the SSB signal and attempts to extract the PBCH-DMRS sequence. After obtaining the first I / Q sample sequence, the second I / Q sample sequence, and the third I / Q sample sequence, UE 102 calculates the total correlation value in a manner similar to that described above. For example, UE 102 can combine the first I / Q sample sequence, the second I / Q sample sequence, and the third I / Q sample sequence, and then calculate the total correlation value. UE 102 can also calculate a first correlation value, a second correlation value, and a third correlation value based on a first I / Q sample sequence, a second I / Q sample sequence, and a third I / Q sample sequence, and then combine the first, second, and third correlation values. More details are described in... Figures 4 to 6 middle.

[0048] In some respects, UE 102 may determine that the total correlation value is below a threshold. In such cases, UE 102 continues to search for the received signal in the moving window pattern described above.

[0049] Figure 4An exemplary method for target cell search is shown. For convenience, and not limitation, please refer to... Figure 1 , Figure 2 and Figure 7 Element description Figure 4 Method 400 may represent an electronic device that implements joint detection for target cell search (e.g., Figure 1 The operation of UE 102). Exemplary method 400 can also be performed by... Figure 2 System 200 (controlled or implemented by processor 210) and / or Figure 7 The method is executed by computer system 700. However, method 400 is not limited to the specific aspects depicted in the figures, and other systems can be used to execute the method, as those skilled in the art will understand. It should be understood that not all operations may be required, and these operations may not be consistent with... Figure 4 Execute in the same order as shown.

[0050] At position 402, UE 102 receives a configuration message from base station 106. In some aspects, the configuration message includes the cell ID of cell 108, from which UE 102 can determine the PSS reference sequence and SSS reference sequence of cell 108. The configuration may also include PBCH-DMRS sequence information corresponding to the PBCH-DMRS sequence of cell 108, such as the SSB index of cell 108. The configuration message may also include the size and periodicity of the search window for the target cell search.

[0051] At 404, UE 102 determines the PSS reference sequence and SSS reference sequence of cell 108 based on the configuration message. Additionally, UE 102 can determine the PBCH-DMRS sequence of cell 108 based on the cell ID of cell 108 and the PBCH-DMRS sequence information of cell 108 (such as the SSB index).

[0052] At 406, UE 102 receives a signal from cell 108 via base station 110. In some aspects, UE 102 receives the signal within a search window and stops receiving when the search window passes. The received signal may include one or more symbols, such as OFDM symbols.

[0053] At position 408, UE 102 calculates the total correlation value. In some respects, UE 102 converts the first four symbols into a first I / Q sample sequence, a second I / Q sample sequence, and a third I / Q sample sequence, as described above. Figure 3 As described in [the document]. For example, UE 102 treats the first four symbols as [the following]. Figure 3The SSB signal symbols 302, 304, 306, and 308 described herein. UE 102 then calculates the total correlation value between the first I / Q sample sequence, the second I / Q sample sequence, and the third I / Q sample sequence and the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence of cell 108. As described above, UE 102 can combine the first I / Q sample sequence, the second I / Q sample sequence, and the third I / Q sample sequence to provide a first combined sequence, and combine the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence to provide a second combined sequence. Then, UE 102 calculates the total correlation value between the first combined sequence and the second combined sequence.

[0054] In some aspects, UE 102 can also convert the received signal into a total I / Q sample sequence. Then, UE 102 determines the total reference sequence by combining the PSS reference sequence, SSS reference sequence, and PBCH-DMRS sequence of cell 108 as shown in symbols 302, 304, 306, and 308. For example, the PBCH-DMRS sequence spans symbols 304, 306, and 308. Therefore, UE 102 divides the PBCH-DMRS sequence into a first part, a second part, and a third part corresponding to symbols 304, 306, and 308, respectively. UE 102 then combines the SSS reference sequence and the second part of the PBCH-DMRS sequence, where the combination corresponds to symbol 306. UE 102 concatenates the PSS reference sequence, the first part of the PBCH-DMRS sequence, the combination of the second part of the PBCH-DMRS sequence and the SSS reference sequence, and the third part of the PBCH-DMRS sequence to form the total reference sequence. Afterward, UE 102 calculates the total correlation value between the total I / Q sample sequence and the total reference sequence.

[0055] In other respects, UE 102 can calculate the total correlation value by combining multiple correlation values, such as... Figure 5 and Figure 6 This will be discussed in more detail later.

[0056] At 410, UE 102 determines whether the total correlation value is higher than a threshold. In some respects, the threshold can be predetermined and / or hard-coded in UE 102.

[0057] If UE 102 determines that the total correlation value is below a threshold, control moves back to 406. In some respects, at 406, if the signal previously received by UE 102 has more than four symbols, UE 102 delays the received signal by one I / Q sample duration instead of receiving additional signals. For example, if the received signal has a duration of four symbols plus one I / Q sample duration, when control moves from 410 to 406, UE 102 delays the received signal by one I / Q sample. As discussed above, UE 102 removes the first I / Q sample of the first symbol and concatenates the I / Q samples following the first symbol to form the delayed first symbol of the received signal. The second, third, and fourth symbols of the received signal are similarly delayed by one I / Q sample. However, if the signal previously received by UE 102 has less than or exactly four symbols, UE 102 receives additional signals from base station 110.

[0058] In some respects, if the received additional signal is within the same search window as the previously received signal, UE 102 removes the first I / Q sample of the first symbol of the initially received signal and concatenates it with the additional signal. On the other hand, if the additional signal is received in a different search window, UE 102 discards the previously received signal. If UE 102 determines that the total correlation value is above a threshold, control moves to 412.

[0059] At 412, UE 102 determines that the SSB signal was successfully detected. For example, UE 102 determines that the first four symbols of the received signal correspond to symbols 302, 304, 306, and 308 of the SSB signal.

[0060] At 414, UE 102 establishes a radio connection with cell 108 via base station 110, such as connection 114. For example, UE 102 can decode the PBCH payload of the SSB signal and use the PBCH payload and other information (such as PCID) to establish a radio connection.

[0061] Figure 5 An exemplary method for joint detection is shown. For convenience, and not limitation, please refer to... Figure 1 , Figure 2 and Figure 7 Element description Figure 5 Method 500 may represent an electronic device that implements joint detection (e.g., Figure 1 The operation of UE 102). Exemplary method 500 can also be performed by... Figure 2 System 200 (controlled or implemented by processor 210) and / or Figure 7The method is executed by computer system 700. However, method 500 is not limited to the specific aspects depicted in the figures, and other systems can be used to execute the method, as those skilled in the art will understand. It should be understood that not all operations may be required, and these operations may not be consistent with... Figure 5 The same order of execution is shown. In some respects, method 500 describes... Figure 4 Details of 408 in the text.

[0062] At position 502, UE 102 calculates a first correlation value. In some aspects, UE 102 converts the first symbol of the received signal into a first I / Q sample sequence as described above. UE 102 then calculates a first correlation value between the first I / Q sample sequence and the PSS reference sequence. In other aspects, UE 102 converts the received signal into a total I / Q sample sequence and calculates a first correlation value between the total I / Q sample sequence and the PSS reference sequence. In such cases, the length of the total I / Q sample sequence may differ from the length of the PSS reference sequence.

[0063] At position 504, UE 102 delays the received signal by one symbol duration. For example, similar to a shift register, UE 102 processes the second symbol and the symbols following it. In some aspects, UE 102 converts the second, third, and fourth symbols into a combined I / Q sample sequence corresponding to the SSS reference sequence and PBCH-DMRS sequence of cell 108. In other aspects, UE 102 converts the second, third, and fourth symbols into multiple I / Q sample sequences, such as... Figure 6 More detailed descriptions are available in the text.

[0064] At 506, UE 102 calculates the combined correlation value. In some aspects, UE 102 determines the combined reference sequence based on the SSS reference sequence and PBCH-DMRS sequence of cell 108. UE 102 then calculates the combined correlation value between the combined I / Q sample sequence and the combined reference sequence at 504. In other aspects, UE 102 calculates the combined correlation value based on multiple correlation values ​​calculated from multiple I / Q sample sequences, such as... Figure 6 More detailed descriptions are available in the text.

[0065] At point 508, UE 102 calculates the total correlation value by combining the first correlation value and the combined correlation value. In some aspects, UE 102 incoherently combines the first correlation value and the combined correlation value by adding the absolute values ​​of the first correlation value and the combined correlation value. In other aspects, UE 102 coherently combines the first correlation value and the combined correlation value by directly adding the first correlation value and the combined correlation value, wherein the first correlation value and the combined correlation value can be complex numbers or real numbers.

[0066] Figure 6 An exemplary method for calculating combined correlation values ​​is shown. For convenience, and not limitation, please refer to... Figure 1 , Figure 2 and Figure 7 Element description Figure 6 Method 600 can represent an electronic device that calculates combined correlation values ​​(e.g., Figure 1 The operation of UE102). Exemplary method 600 can also be performed by... Figure 2 System 200 (controlled or implemented by processor 210) and / or Figure 7 The method is executed by computer system 700. However, method 600 is not limited to the specific aspects depicted in the figures, and other systems can be used to execute the method, as those skilled in the art will understand. It should be understood that not all operations may be required, and these operations may not be consistent with... Figure 6 Execute in the same order as shown.

[0067] At 602, UE 102 calculates the second correlation value. For example, UE 102 converts the second symbol of the received signal into a second I / Q sample sequence. UE 102 then determines the first portion of the PBCH-DMRS sequence, which corresponds to a portion of the PBCH-DMRS sequence included in the second symbol (such as symbol 304) of the SSB signal. This is because the PBCH-DMRS sequence spans the second, third, and fourth symbols, as... Figure 3 As shown. In other words, UE 102 treats the second symbol of the received signal as the second symbol of the SSB signal, such as symbol 304, and extracts the portion of the PBCH-DMRS sequence included in the second symbol. Then, UE 102 calculates a second correlation value between the second I / Q sample sequence and the first portion of the PBCH-DMRS sequence.

[0068] In some respects, UE 102 calculates the second correlation value based on the total I / Q sample sequence described in 502. UE 102 delays the received signal by one symbol duration by truncating the total I / Q sample sequence. For example, UE 102 removes a portion of the total I / Q sample sequence corresponding to the first symbol of the received signal. UE 102 then calculates the second correlation value between the total I / Q sample sequence with the one symbol duration delay and the first portion of the PBCH-DMRS.

[0069] At 604, UE 102 delays the received signal by two symbol durations. In some aspects, UE 102 converts the third symbol of the received signal into a third I / Q sample sequence. In other aspects, UE 102 delays the received signal by two symbol durations by truncating the total I / Q sample sequence. For example, UE 102 removes a portion of the total I / Q sample sequence corresponding to the first and second symbols of the received signal.

[0070] At position 606, UE 102 calculates the third correlation value. UE 102 determines the combined reference sequence based on the second portion of the PBCH-DMRS sequence and the SSS reference sequence. UE 102 then calculates the third correlation value between the third I / Q sample sequence and the combined reference sequence. In other respects, UE 102 calculates the third correlation value based on the total I / Q sample sequence. For example, UE 102 calculates the third correlation value between the total I / Q sample sequence with a two-symbol duration delay and the combined reference sequence.

[0071] At 608, UE 102 delays the received signal by three symbol durations. In some aspects, UE 102 converts the fourth symbol of the received signal into a fourth I / Q sample sequence. In other aspects, UE 102 delays the received signal by three symbol durations by truncating the total I / Q sample sequence. For example, UE 102 removes a portion of the total I / Q sample sequence corresponding to the first, second, and third symbols of the received signal.

[0072] At position 610, UE 102 calculates the fourth correlation value. In some aspects, UE 102 calculates the fourth correlation value between the fourth I / Q sample sequence and the third portion of the PBCH-DMRS sequence. In other aspects, UE 102 calculates the fourth correlation value based on the total I / Q sample sequence. For example, UE 102 calculates the fourth correlation value between the total I / Q sample sequence with a three-symbol duration delay and the third portion of the PBCH-DMRS sequence.

[0073] In some respects, steps 602-610 are described Figure 5 Details of 504 in the document.

[0074] At step 612, UE 102 combines the second, third, and fourth related values. In some aspects, UE 102 combines the second, third, and fourth related values ​​incoherently by adding the absolute values ​​of the second, third, and fourth related values. In other aspects, UE 102 combines the second, third, and fourth related values ​​coherently by directly adding the second, third, and fourth related values, wherein the second, third, and fourth related values ​​can be complex or real numbers. In some aspects, step 612 describes... Figure 5 Details of 506 in the text.

[0075] One or more computer systems (such as) can be used, for example. Figure 7 The computer system 700 shown herein is used to implement various aspects. The computer system 700 can be any well-known computer capable of performing the functions described herein, such as… Figure 1 Electronic devices 102, 106 and 110, or Figure 2 Electronic device 200. Computer system 700 includes one or more processors (also referred to as central processing unit or CPU), such as processor 704. Processor 704 is connected to communication infrastructure 706 (e.g., bus). Computer system 700 also includes user input / output devices 703, such as monitor, keyboard, pointing device, etc., that communicate with communication infrastructure 706 via user input / output interface 702. Computer system 700 also includes main memory or primary memory 708, such as random access memory (RAM). Main memory 708 may include one or more levels of cache. Main memory 708 stores control logic components (e.g., computer software) and / or data.

[0076] The computer system 700 may also include one or more auxiliary storage devices or memories 710. Auxiliary storage 710 may include, for example, a hard disk drive 712 and / or a removable storage device or drive 714. The removable storage drive 714 may be a floppy disk drive, magnetic tape drive, optical disk drive, optical storage device, magnetic tape backup device, and / or any other storage device / drive.

[0077] Removable storage drive 714 can interact with removable storage unit 718. Removable storage unit 718 includes a computer-usable or readable storage device on which computer software (control logic components) and / or data are stored. Removable storage unit 718 can be a floppy disk, magnetic tape, optical disc, DVD, optical storage disk, and / or any other computer data storage device. Removable storage drive 714 reads from and / or writes to removable storage unit 718 in a well-known manner.

[0078] According to some aspects, the auxiliary storage 710 may include other means, tools, or other methods for allowing the computer system 700 to access computer programs and / or other instructions and / or data. Such means, tools, or other methods may include, for example, a removable storage unit 722 and an interface 720. Examples of removable storage units 722 and interfaces 720 may include program boxes and box interfaces (such as those found in video game devices), removable memory chips (such as EPROM or PROM) and associated sockets, memory sticks and USB ports, memory cards and associated memory card slots, and / or any other removable storage units and associated interfaces.

[0079] Computer system 700 may also include a communication or network interface 724. Communication interface 724 enables computer system 700 to communicate and interact with any combination of remote devices, remote networks, remote entities, etc. (individually and collectively referred to by reference numeral 728). For example, communication interface 724 may allow computer system 700 to communicate with remote device 728 via communication path 726, which may be wired and / or wireless, and may include any combination of LAN, WAN, Internet, etc. Control logic components and / or data may be transmitted to and from computer system 700 via communication path 726.

[0080] The operations described in the foregoing aspects can be implemented in various configurations and architectures. Therefore, some or all of the operations described in the foregoing aspects can be performed in hardware, software, or both. In some aspects, tangible, non-transitory devices or articles of art include tangible, non-transitory computer-usable or readable media on which control logic components (software) are stored, also referred to herein as computer program products or program storage devices. This includes, but is not limited to, computer system 700, main memory 708, secondary memory 710, and removable storage units 718 and 722, and tangible articles embodying any combination thereof. Such control logic components, when executed by one or more data processing devices (such as computer system 700), cause such data processing devices to operate as described herein.

[0081] Based on the teachings contained in this disclosure, it will be apparent to those skilled in the art how to use [other methods]. Figure 7 The aspects of this disclosure may be made and used with data processing devices, computer systems, and / or computer architectures other than those shown herein. In particular, the aspects may operate with software, hardware, and / or operating system implementations other than those described herein.

[0082] It should be understood that the Detailed Description section, rather than the Summary and Abstract section, is intended to be used to interpret the claims. The Summary and Abstract section may set forth one or more, but not all, exemplary aspects of this disclosure as contemplated by the inventors, and is therefore not intended to limit this disclosure or the appended claims in any way.

[0083] Although this disclosure has been described herein with reference to exemplary aspects of exemplary fields and applications, it should be understood that this disclosure is not limited thereto. Other aspects and modifications are possible and are within the scope and spirit of this disclosure. For example, and without limiting the generality of this paragraph, the aspects are not limited to the software, hardware, firmware, and / or entities shown in the figures and / or described herein. Furthermore, the aspects (whether explicitly described herein or not) have significant utility for fields and applications beyond those described herein.

[0084] The aspects have been described here using functional building blocks that illustrate specific implementations of functions and their relationships. For ease of description, the boundaries of these functional building blocks have been arbitrarily defined herein. Alternative boundaries can be defined as long as the specified functions and relationships (or their equivalents) are performed appropriately. Furthermore, alternative aspects may perform functional blocks, steps, operations, methods, etc., in a different order than that described herein.

[0085] References to “an implementation,” “implementation,” “exemplary implementation,” or similar phrases herein indicate that the described implementation may include specific feature structures, structures, or characteristics, but each implementation may not necessarily include such feature structures, structures, or characteristics. Furthermore, such terminology does not necessarily refer to the same implementation. Additionally, when a specific feature, structure, or characteristic is described in connection with an implementation, whether or not it is explicitly mentioned or described herein, the integration of such feature, structure, or characteristic into other aspects is within the knowledge of a person skilled in the art.

[0086] The breadth and scope of this disclosure should not be limited by any of the foregoing exemplary aspects, but should be defined solely by the following claims and their equivalents.

[0087] As is widely recognized, the use of personally identifiable information should comply with privacy policies and practices that are generally accepted to meet or exceed industry or governmental requirements for protecting user privacy. Specifically, personally identifiable information data should be managed and processed to minimize the risk of unintentional or unauthorized access or use, and the nature of authorized use should be clearly explained to users.

[0088] This disclosure assumes that entities responsible for collecting, analyzing, disclosing, transmitting, storing, or otherwise using such personal information data will comply with established privacy policies and / or privacy practices. Specifically, such entities should implement and adhere to privacy policies and practices that are generally recognized as meeting or exceeding industry or governmental requirements for maintaining the privacy and security of personal information data. Such policies should be easily accessible to users and should be updated as data collection and / or use change. Personal information from users should be collected for the entity's lawful and reasonable purposes and not shared or sold outside of these lawful uses. Furthermore, such collection / sharing should only occur upon receipt of the user's informed consent. In addition, such entities should consider taking any necessary steps to protect and safeguard access to such personal information data and ensure that others with access to such personal information data comply with their privacy policies and processes. Additionally, such entities may be subject to third-party evaluations to demonstrate their compliance with widely accepted privacy policies and practices. Furthermore, policies and practices should be adapted to the specific types of personal information data collected and / or accessed, and to applicable laws and standards, including specific considerations regarding jurisdiction. For example, in the United States, the collection or access to certain health data may be governed by federal and / or state laws, such as the Health Insurance Transfer and Accountability Act (HIPAA); while in other countries, health data may be subject to other regulations and policies and should be handled accordingly. Therefore, different privacy practices should be maintained for different types of personal data in each country.

Claims

1. A user equipment (UE), the UE comprising: transceiver; as well as A processor, communicatively coupled to the transceiver and configured to: A reference signal sequence is determined, including a first-level synchronization sequence and a second-level synchronization sequence of the target cell, wherein the first-level synchronization sequence includes a primary synchronization signal (PSS) sequence, and wherein the second-level synchronization sequence includes a secondary synchronization signal (SSS) sequence, and wherein the reference signal sequence further includes a first physical broadcast channel demodulation reference signal (PBCH DMRS), a second PBCH DMRS, and a third PBCH DMRS of the target cell. The transceiver is used to receive a signal sequence from the target cell; The first correlation value is calculated based on the PSS sequence and the received signal sequence; The first delayed signal sequence is determined by delaying the received signal sequence by one symbol duration; The second correlation value is calculated based on the first PBCH DMRS and the first delayed signal sequence; The second delayed signal sequence is determined by delaying the received signal sequence by two symbol durations; A third correlation value is calculated based on the second delayed signal sequence and the combination of the SSS sequence and the second PBCH DMRS; The third delayed signal sequence is determined by delaying the received signal sequence by three symbol durations; Based on the third delayed signal sequence and the third PBCH DMRS, calculate the fourth correlation value; The combined correlation value is calculated by coherently combining the second correlation value, the third correlation value, and the fourth correlation value; The total correlation value is calculated by incoherently combining the first correlation value and the combined correlation value; Determine whether the total correlation value exceeds the threshold; Based on the total correlation value exceeding the threshold, the synchronization signal of the target cell is detected based on the received signal sequence; and The transceiver is used to establish a wireless connection with the target cell based on the synchronization signal.

2. The UE according to claim 1, wherein the reference signal sequence further includes a cell-specific reference sequence (CRS).

3. The UE of claim 1, wherein the processor is further configured to determine the reference signal sequence by receiving a configuration message from the serving cell.

4. The UE according to claim 1, wherein, To determine the first PBCH DMRS, the second PBCH DMRS, and the third PBCH DMRS, the processor is further configured to: Receive the SSB index of the serving cell and the cell ID of the target cell from the serving cell; The SSB index of the target cell is determined based on the SSB index of the serving cell; as well as The first PBCH DMRS, the second PBCH DMRS, and the third PBCH DMRS are determined based on the SSB index and the cell ID of the target cell.

5. A method for a user equipment (UE) to connect to a target cell, the method comprising: A reference signal sequence is determined, including a first-level synchronization sequence and a second-level synchronization sequence of the target cell, wherein the first-level synchronization sequence includes a primary synchronization signal (PSS) sequence, and wherein the second-level synchronization sequence includes a secondary synchronization signal (SSS) sequence, and wherein the reference signal sequence further includes a first physical broadcast channel demodulation reference signal (PBCH DMRS), a second PBCH DMRS, and a third PBCH DMRS of the target cell. Receive a signal sequence from the target cell; calculate a first correlation value based on the PSS sequence and the received signal sequence; The first delayed signal sequence is determined by delaying the received signal sequence by one symbol duration; The second correlation value is calculated based on the first PBCH DMRS and the first delayed signal sequence; The second delayed signal sequence is determined by delaying the received signal sequence by two symbol durations; A third correlation value is calculated based on the second delayed signal sequence and the combination of the SSS sequence and the second PBCH DMRS; The third delayed signal sequence is determined by delaying the received signal sequence by three symbol durations; Based on the third delayed signal sequence and the third PBCH DMRS, calculate the fourth correlation value; The combined correlation value is calculated by coherently combining the second correlation value, the third correlation value, and the fourth correlation value; The total correlation value is calculated by incoherently combining the first correlation value and the combined correlation value; Determine whether the total correlation value exceeds the threshold; Based on the total correlation value exceeding the threshold, the synchronization signal of the target cell is detected based on the received signal sequence; and A connection with the target cell is established based on the synchronization signal.

6. The method of claim 5, wherein the reference signal sequence further includes a cell-specific reference sequence (CRS).

7. The method of claim 5, wherein the method further comprises determining the reference signal sequence by receiving a configuration message from the serving cell.

8. The method of claim 5, wherein determining the first PBCH DMRS, the second PBCH DMRS, and the third PBCH DMRS further comprises: Receive the SSB index of the serving cell and the cell ID of the target cell from the serving cell; The SSB index of the target cell is determined based on the SSB index of the serving cell; as well as The first PBCH DMRS, the second PBCH DMRS, and the third PBCH DMRS are determined based on the SSB index and the cell ID of the target cell.

9. A non-transitory computer-readable medium (CRM) comprising instructions for causing the user-equipped UE to perform the method of any one of claims 5-8 when executed by one or more processors of the user-equipped UE.

Images