204 results about "Cell search" patented technology

The present invention relates to the technical field of wireless communications, and provides a 5G downlink user message acquisition method, apparatus and device, and a storage medium, the method comprising: acquiring a main information block based on cell search synchronization, and determining a configuration parameter of CORESET0 according to the main information block; blind detection is carried out based on configuration parameters of preset SI-RNTI and CORESET0, and system downlink control information is obtained; analyzing the system downlink control information, and extracting a system message according to the PDSCH parameter obtained by analysis; determining a base station type based on the system message, and executing a corresponding blind detection strategy according to the base station type to obtain user downlink control information; and analyzing the downlink control information of the user, and extracting a user message according to an analysis result. According to the invention, the processing flow is simplified, the calculation complexity is reduced, the system adaptability is improved, and a more efficient and flexible method is provided for obtaining the downlink message of the 5G user.

A cell search method and a communication apparatus, where the method includes a terminal device receiving first information useable by the terminal device to search for a terrestrial network (TN) neighboring cell. When the terminal device is not within a coverage area of a non-terrestrial network (NTN) cell or the terminal device is at an edge of the coverage area of the NTN cell, the terminal device searches for the TN neighboring cell based on the first information.

Embodiments provide a transceiver [e.g., UE], wherein the transceiver is configured, in a network search mode [e.g., cell search mode], to search for a presence indicator signal, the presence indicator signal indicating a presence of a wireless [e.g., radio based] communication network [e.g., 5G / NR communication network], wherein the presence indicator signal is associated in frequency with a group [e.g., block] of channels used by the wireless communication network [e.g., for synchronization], the group of channels comprising at least two channels, wherein the transceiver is configured, upon detecting the presence indicator signal, to search for a synchronization signal [e.g., synchronization signal block, SSB] in one or more channels of the group of channels.

Provided is a method of performing, by a user equipment (UE), cell reselection based on non-terrestrial networks (NTN) in a wireless communication system. Here, the method of performing cell reselection may include acquiring cell reselection condition information from a base station; moving from a first cell to a second cell based on mobility of the UE and acquiring measurement related information for cell reselection from the second cell; and performing an NTN cell search when a specific condition for cell reselection is satisfied based on the cell reselection condition information.

Methods, systems, and devices for wireless communications are described. Generally, the described techniques enable a first wireless device to scramble at least a portion of one or more frequency-modulated continuous wave (FMCW) signals (e.g., hybrid FMCW signals) using a scrambling identifier, which may enable a second wireless device to differentiate between FMCW signals based on identifying the scrambling identifier. For example, the first wireless device may scramble at least a portion of an upchirp signal, a downchirp signal, or both, of an FMCW signal. The second wireless device may identify the scrambling identifier based on attempting to descramble the scrambled portion of the FMCW signal using multiple candidate scrambling identifiers. In some examples, a scrambling pattern (e.g., which portion of the upchirp signal, downchirp signal, or both, is scrambled) of a hybrid FMCW signal may indicate information associated with the first wireless device.

The embodiment of the invention provides a cell residence method and device, relates to the field of communication, and can avoid the problem that a terminal device cannot reside in a candidate cell due to the fact that Qrxlevmin configured by a network is unreasonable. The method comprises the following steps that: the terminal equipment searches cells, wherein the searched cells comprise a first cell; the terminal equipment obtains the minimum receiving power threshold of the first cell; if the minimum receiving power threshold is greater than the first preset threshold value, replacing the minimum receiving power threshold with a second preset threshold value; the first preset threshold value is greater than or equal to the second preset threshold value; and determining whether to reside in the first cell according to a second preset threshold value.

The invention belongs to the technical field of communication, and provides an LTE (Long Term Evolution) cell searching method and device, and the method comprises the steps: generating a CRS (Cell Reference Signal) sequence according to a PCI (Peripheral Component Interconnect) defined by an LTE communication system; the method comprises the following steps: extracting a time domain signal from a received signal with a time slot length, sampling the time domain signal at equal intervals, and converting the sampled signal into a frequency domain signal; for the CRS sequence corresponding to each PCI, extracting subcarrier data from the frequency domain signal, and performing correlation operation on the subcarrier data and the target CRS sequence to obtain a correlation value of the current PCI; traversing all PCIs to obtain a plurality of correlation values; and determining the maximum value in the plurality of correlation values as a target PCI (Peripheral Component Interconnect), and performing cell search according to the target PCI. According to the method provided by the invention, the cell search process can be completed in a faster and shorter period by using the cell reference signal, and only one time sequence data needs to be stored, so that the cell search overhead is reduced, and the cell search efficiency is improved.

The invention provides a multi-cell search method of a synchronization system, which can be applied to the technical field of cell search. The multi-cell searching method comprises the following steps: searching candidate cells by utilizing a synchronous searching mode; wherein the number of the candidate cells is not less than 1; determining a reference cell based on the credibility of the candidate cell; determining the wireless frame timing of the candidate cell according to the candidate primary synchronization signal position and the wireless frame position of the candidate cell; based on the frame timing deviation between the wireless frame timing of the candidate cells and the wireless frame timing of the reference cell, screening false detection cells in the candidate cells in the maximum coverage range; and removing false detection cells from the candidate cells to obtain a cell search result. Therefore, according to the multi-cell search method disclosed by the invention, the false detection condition of the cell search is reduced, and the accuracy of the cell search is improved. The invention further provides a multi-cell searching device and equipment of the synchronization system.

The invention discloses a satellite-borne space-based measurement and control method based on a non-ground network and related equipment. The method is used for a satellite-borne space-based measurement and control device, the satellite-borne space-based measurement and control device is arranged on a low-orbit satellite platform, and the method comprises the following steps: respectively obtaining real-time orbit parameters of a low-orbit satellite, GNSS positioning information and a pre-stored high-orbit satellite coverage information table; based on the current orbit parameter, the GNSS positioning information and a high-orbit satellite coverage information table of a high-orbit satellite pre-stored or periodically updated from a satellite service computer, calculating a space-time relationship between the low-orbit satellite and a cell coverage range; and under the condition that it is predicted and determined that the cell coverage of the target high-orbit satellite is about to enter according to the time-space relationship obtained through calculation, waking up in advance and initiating cell search and a control flow of accessing at any time. The problems that an existing space-based measurement and control technology is high in construction cost, limited in multiple access capacity and poor in dynamic adaptability can be solved.

A terminal for performing an initial cell access, according to an embodiment of the present disclosure, receives a PBCH signal of a first cell via a cell search, receives SIB1-scheduling information on a CSS set related to the PBCH signal, and determines whether to perform a remaining access procedure on the first cell, on the basis of the SIB1-scheduling information, wherein the terminal is a second type terminal in which the capability is reduced to support a bandwidth narrower than that of a first type terminal, and the terminal may determine, as the second type terminal, whether an access to the first cell is allowed, on the basis of the state of a bit reserved so as not to be used by the first type terminal within the SIB1-scheduling information.

Message(s) are created to be transmitted over a geostationary system. The message(s) include coverage information for non-geo stationary satellite(s) in an NTN from PLMN(s). The message(s) are transmitted over the geostationary system. A UE searches for a PLMN. The UE, in response to finding a PLMN transmitting, using a geostationary system, message(s) including coverage information for non-geo stationary satellite(s) in an NTN, receives the message(s). The UE updates preferences used for a list used for PLMN selection to make PLMN(s) corresponding to the coverage information as higher priority than other PLMN(s) in the list. The UE performs cell search(es) for cells from the non-geo stationary satellite(s) using the updated list.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive system information that indicates a total number of high priority carrier frequencies. The UE may receive an extended discontinuous reception (eDRX) configuration that indicates an eDRX cycle length. The UE may perform, during a high priority cell search with eDRX, measurements for high priority frequency layers in accordance with a time period, wherein the time period is based at least in part on the total number of high priority carrier frequencies and the eDRX cycle length. Numerous other aspects are described.

Approaches are described to enhance radio link monitoring and link recovery for the integration of non-terrestrial networks (e.g., satellites) into next generation wireless communication networks. Certain approaches describe the modification of block error rate threshold requirements based on the particulars of the satellites involved, and the procedure for making those modifications. Other approaches describe the modification of the evaluation period based on the particulars of the satellites involved, and the procedure for making those modifications. In making these modifications, user-equipment (UE)-specific margins are also considered. In addition, modifications to the procedure for higher priority cell search are also described when non-terrestrial wireless communication networks are involved.

A user equipment (UE), a base station, a baseband processor or other network device can operate to perform an initial access to a satellite base station (e.g., a non-terrestrial network (NTN) ). The UE can perform a cell search during the initial access on an NTN band based on one of a plurality of synchronization signal block (SSB) periodicities that each map to a different NTN band ID, respectively, where the UE is an idle or inactive mode. A number of candidate values of the SSB periodicities can correspond to a different NTN band ID, or NTN region ID, respectively, according to a predefined association in one or more data sets.

The invention discloses locomotive broadband data access equipment based on a core board and an implementation method, and belongs to the technical field of subway wireless communication. The working process is as follows: after a linux system of a core board is started, a hard disk is loaded, an LTE broadband data module and a 5G NR broadband data module are driven to carry out frequency search and cell search, authentication registration is carried out in a limited working frequency band, a special bearer is established, then a network is continuously detected, and the detection result is obtained. The LTE broadband data module and the 5G NR broadband data module of the equipment can operate in an online state at the same time. The data volume for bearing the communication service is greatly improved, and the real-time performance of communication is greatly improved.

The present invention relates to determine a common application time-base for different positionally fixed wireless stations, which perform a timing application in different unsynchronized radio-access-network cells, a method comprises providing to the wireless stations a timing-report instruction. It instructs the wireless stations to perform a cell-search procedure and to determine a respective set of time synchronization information retrieved from any detected base station with reference to its respective time base. If more than one set of time synchronization information from a corresponding number of detected base stations has been retrieved, the wireless stations provides timing synchronization data indicative of the retrieved sets of time synchronization information from the detected base stations. An application server receives the at least one timing report and determines a common application time-base for the different detected base stations, using the different sets of timing synchronization data provided.

In a wireless communication system, a user equipment (UE) may measure synchronization signal blocks (SSBs) to evaluate neighbor cells. A UE configured with multiple potential receive beams may conventionally measure one receive beam per SSB. A UE may improve the speed of receive beam measurements by performing measurements using demodulation reference signals (DMRS) of physical broadcast channel (PBCH) symbols, which occur twice per SSB. The UE may perform a cell search for neighbor cells available to the UE in a synchronized network to determine a number of the neighbor cells and timing information for each of the neighbor cells. The UE may measure one or more receive beams using the DMRs of the PBCHs of SSBs received from the neighbor cells. Each receive beam may be measured during a beam switch time unit including a PBCH symbol from each of the neighbor cells according to the timing information.

An arrangement for non-terrestrial communication networks, where a network node providing a cell transmits an indicator of upcoming change in the transmission of synchronization signals to a user equipment. Based on the received indicator the user equipment may determine whether to change the cell or to camp in the current cell. Similar indicator may be used during cell change procedure when determining whether to access the cell found in the cell search procedure or to re-initiate the cell search procedure for finding another cell.

The present application discloses a method, device, terminal device, storage medium and chip for eliminating co-channel interference. The method is applied to the terminal device, including: obtaining a first received signal, the first received signal is a signal obtained based on multiple synchronization signals sent to the terminal device by multiple network devices in the same time period with the same transmission frequency band; performing a cell search on the first received signal to obtain first cell information, the first cell information is used to indicate the presence of a first interference signal in the first received signal; when the time difference between the start time of the first received signal and the start time of the first interference signal is greater than a preset threshold, a time domain method for eliminating co-channel interference is used to eliminate the interference signal in the first received signal according to the first cell information, and obtain a first target signal, the first cell information includes timing information for indicating the start time of the first interference signal. Based on the method provided by the present application, co-channel interference can be effectively eliminated, communication quality can be improved, and user experience can be improved.

Apparatuses, methods, and systems are disclosed for performing cell selection / reselection on a radio frequency associated with a network slice. One apparatus includes a processor and a transceiver that camps on a first frequency layer of a RAN while in a RRC idle state, the first frequency layer supporting a first set of network slices, where the first set of network slices is prioritized for use with a first frequency. The processor iteratively performs cell search on a second frequency layer while the apparatus is camped on the first frequency layer, the second frequency layer supporting a second set of network slices, where the second set of network slices is prioritized for use with a second frequency. The processor maintains in parallel the second frequency layer while in the RRC idle state.

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may receive system information that indicates a total number of high priority carrier frequencies. The UE may receive an extended discontinuous reception (eDRX) configuration that indicates an eDRX cycle length. The UE may perform, during a high priority cell search with eDRX, measurements for high priority frequency layers in accordance with a time period, wherein the time period is based at least in part on the total number of high priority carrier frequencies and the eDRX cycle length. Numerous other aspects are described.

One embodiment of the present disclosure relates to a device and a method for transmitting an uplink reference signal in an electronic device. The electronic device can include: a communication circuit for supporting a first bandwidth related to reduced capability and a second bandwidth greater than the first bandwidth; a processor; and a memory for storing instructions, such that when executed by the processor, the instructions instruct the electronic device to: identify whether a cell that does not support the reduced capability is present if a cell that supports the reduced capability is not retrieved through cell search; set the bandwidth of the electronic device to the second bandwidth if the cell that does not support the reduced capability is present; and, in response to the setting to the second bandwidth, access, through the communication circuit, the cell that does not support the reduced capability. Other embodiments are also possible.

Procedures, methods, architectures, apparatuses, systems, devices, and computer program products for network access in a wireless communications system using common signaling, such as synchronization signals, for multiple Radio Access Technologies (RATs). A wireless transmit / receive unit, WTRU, performs a cell search in the system, obtains first information indicative of whether spectrum sharing is configured in a cell discovered in the cell search and of available radio access technologies, RATs, in the discovered cell, in case the first information indicates that spectrum sharing is configured in the discovered cell, determines which of the of available RATs to access, obtains access configuration parameters for the determined RAT to access, and performs, using the access configuration parameters, a random-access procedure to access the RAT.

The invention relates to the technical field of communication, and provides a cell searching method and device, electronic equipment, a storage medium and a computer product, and the method comprises the steps: receiving air interface data which is transmitted by a base station and comprises a synchronization signal, carrying out the down-sampling processing based on the air interface data, and obtaining signal data which comprises at least two paths of sampling signals; aiming at each path of sampling signal in the signal data, respectively carrying out main synchronization signal detection to obtain a signal correlation peak value between the corresponding sampling signal and a locally stored main synchronization sequence; based on the signal correlation peak value of each sampling signal, determining a cell intra-group identifier corresponding to the main synchronization sequence; determining the sampling signal corresponding to the signal correlation peak value which passes the threshold judgment and has the maximum value as a target sampling signal; and performing cell search based on the target sampling signal and the intra-cell group identifier corresponding to the main synchronization sequence to obtain a cell search result. According to the method and the device, each path of signal is comprehensively considered to avoid omission of signals with better quality, and the success rate of cell search can be guaranteed.

Techniques for performing a cell search for the presence of multiple cells in a frequency band are described. Each frequency band is segmented into sub-bands, each sub-band covering more than one raster scan (e.g., 100 kHz). Each segment has a predetermined center frequency for RF tuning. The number of tunable RF center frequencies can be equal to the number of segments in a frequency band. The techniques include obtaining IQ signals in a digital domain at a predefined RF center frequency. Further, the techniques include computing a matched filtering of PSS sequence with IQ samples of sub-bands with a predefined and predetermined waveform through matched filtering, and averaging correlations for smoothing the peaks that exceed a predetermined threshold to detect or reject the presence of a cell.

This disclosure describes schemes for initial cell search. Considering some scenarios, like NTN, where there are lower workable SNR and larger CFO. However, to ensure quick cell search in such scenarios, novel initial access procedure and schemes for synchronization block design and related issues are necessary. This disclosure proposes methods for enabling UE to quickly cell search and detect the synchronization signal and information, so that to ensure better communication system.

The invention discloses a wireless communication method and device, equipment and a storage medium, and relates to the technical field of communication. The method comprises: receiving an SSB sent by a network device in a first period, the first period being greater than or equal to 20 milliseconds (310). According to the method, the terminal equipment receives the SSB sent by the network equipment in the first period, the first period is larger than or equal to 20 ms, the SSB period is expanded to the first period, the terminal equipment can receive the SSB in the first period, cell search failure is avoided, and communication efficiency is improved.

Various solutions for optimal radio access technology (RAT) selection-based voice call fallback in mobile communications are described. The user equipment (UE) may receive a broadcast message from a serving cell. Specifically, the broadcast message is associated with an indication of quality of service (QoS) flow support for Internet protocol (IP) multimedia subsystem (IMS) communication service. Also, the UE may determine whether to initiate an inter-RAT cell or public land mobile network (PLMN) search based on the indication of QoS flow support for IMS communication service. As the voice call fallback can be performed by selecting the optimal RAT, the inefficiency and latency introduced by multiple, sequential fallback attempts can be prevented.

The invention discloses a cell searching method and device, communication equipment, a storage medium and a computer product. The method comprises the following steps: roughly scanning a data block received in a preset time window to position an area in which at least one synchronization signal block possibly exists; in the area, searching a main synchronization signal through a sliding window with frequency offset stepping, and establishing a main synchronization signal candidate list; secondary synchronization signal detection and cell identification calculation are carried out on primary synchronization signals in the primary synchronization signal candidate list to generate a cell candidate list; determining one synchronization signal block in each cell based on the cell candidate list; determining other synchronization signal blocks of one cell in the data block based on one synchronization signal block in one cell, and determining the strongest synchronization signal block in each cell; and reporting the cell list containing the information of the strongest synchronization signal block. According to the method, rough positioning and fine searching are combined, so that the calculation complexity and time of cell searching can be remarkably reduced.

A user equipment (UE) configured to determine, for each radio access technology (RAT) of a plurality of RATs, a first list of bands on which a public land mobile network (PLMN) is expected to be deployed and a second list of bands including bands not included in the first list, wherein the first list is determined based on a region where the UE is currently located and PLMN deployment information, select a search pattern for performing a cell search based on a current UE scenario, perform a first phase of the cell search and when the first phase of the cell search is unsuccessful and no cell is selected, perform a second phase of the cell search by either scanning frequencies included in the second list of bands for the first priority RAT or scanning frequencies included in the first list of bands for a second priority RAT.