103 results about "Cell synchronization" patented technology

A cell search apparatus and method in an OFDM mobile communication system are provided. In the cell search apparatus, a symbol synchronization acquirer acquires OFDM symbol synchronization by performing CP correlation for a plurality of OFDM symbol intervals. A frame cell synchronization acquirer sorts received OFDM symbols according to the acquired OFDM symbol synchronization, and acquires frame cell synchronization by performing preamble correlation for a plurality of frame cell intervals. A pilot pattern detector sorts received frame cells according to the acquired frame cell synchronization, and detects a pilot pattern for identifying a base station by monitoring a plurality of frame cells.

A small district synchronization method of wide band time duplex beehive system includes: (1) the main synchronization channel of descending synchronization channel is set in the time space DwPTS of descending guide frequency, the descending guiding frequency code which is sent at the DwPTS time space of sending the main synchronization channel is the synchronization symbol of OFDM; (2) using thepower window to search and finish the descending time gross synchronization; (3) determine accurate position of the OFDM synchronization symbol, and obtain the number of the OFDM synchronization symbol. The invention also discloses a small searching method which is suitable for the wide band time duplex beehive system and can realize the small district searching quickly and accurately.

The present invention discloses a wireless regional area network (WRAN) system and a method of cell synchronization adjusting. The method in the present invention includes the following steps: a cell detects the synchronous beaconing information to the adjacent cell and the synchronous beaconing information includes the time scale information and mark information of the adjacent cell; said cell extracts the time scale information of the adjacent cell from said synchronous beaconing information and compares it with the scale information of the local cell to determine if a synchronization adjusting is needed, and if it is, a synchronization adjusting is performed through obtaining frame adjusting time scale, otherwise, the operation is ended. In the present invention, the synchronization adjusting of two adjacent cells is achieved through detecting the synchronous beaconing information by the base station of the cell and the technique problem that the real synchronization adjusting can not be realized because a synchronization adjusting bias and adjusting fluctuation exist in the two adjacent cells having overlapped coverage.

The invention provides a measurement configuration method and a terminal device. The measurement configuration method comprises: receiving configuration information sent by a network device, the configuration information being used for indicating a terminal device to measure a channel state indication reference signal in an idle state, and when the terminal device is in the idle state, measuring the channel state indication reference signal to obtain a measurement result. According to the scheme provided by the invention, a more accurate measurement result can be obtained compared with a measurement result obtained by using a measurement cell synchronization signal block.

A method for searching downlink pilot time slot in TD-SCDMA system is characterized in that: calculate position power eigenvalue of downlink pilot time slot; search power peak eigenvalue in the power eigenvalue and generate a power peak eigenvalue table; repeatedly detect power peak eigenvalue table by default times and export peak eigenvalue position information from high to low; detect downlink synchronization code and 0 time slot middle code and the position information thereof according to peak eigenvalue position information and confirm searching result by the position information of downlink synchronization code and 0 time slot middle code. By the method, the character of the right position can be detected through the expanded peak eigenvalue table as long as the character of the right position is not buried in noise even in low SNR so the validity of cell synchronization get improved greatly and the problem of detection missing in low SNR gets solved effectively.

The invention relates to an LTE (long term evaluation) load balancing method based on a physical cell identity, which comprises the steps that a cell identity which is a load-aware physical cell identity (LA-PCI for short) is used in a cell synchronization signal (PSS (primary synchronization signal) and SSS (secondary synchronization signal)); a user at idle state can obtain the LA-PCI by detecting the cell synchronization signal so as to sense the load level of the cell; and the user terminal can preferentially select a cell with lower load level in a cell selection/reselection stage, thereby automatically balancing the load distribution of cells. The LTE load balancing method based on the physical cell identity has the advantage that the user can actively sense the load level of the cell, know the load condition of the current cell at idle state and before access, select an appropriate cell according to the cell selection/reselection criterion, preferentially resides in a cell which conforms to the reselection conditions and has lower load level, and relieve the condition of uneven load distribution of the cell in advance, thereby realizing the purpose of making full use of total resources of the system.

A system and method for cell synchronization suitable for a wireless signal including substantially identical synchronization signals that repeat in predetermined time intervals, the synchronization signals including a plurality of substantially identical symbols. For a plurality of candidate synchronization points: dividing the wireless signal into a plurality of signal segments, each equal or longer than the time interval, and each including a plurality of sub-segments having substantially same length as the symbol; performing symbol-length cross-correlations between an expected symbol and the sub-segments; performing segmented symbol-wise correlations between the cross-correlation results; calculating a cost function based on the results of the symbol-wise correlations; accumulating the cost functions across a plurality of signal segments; and selecting a coarse synchronization point from the plurality of candidate synchronization points based on the accumulated cost function; Estimating synchronization parameters e.g. time and frequency offset based on the selected synchronization point.

A carrier aggregation application method is provided of attaining time synchronization to a secondary cell for a wireless communication device usable in a cellular communication network. The method comprises, if a time reference of the secondary cell is unknown to the wireless communication device: setting a preliminary time reference of the secondary cell to equal a time reference of a primary cell of the carrier aggregation application; performing a synchronization signal based detection of the time reference of the secondary cell based on the preliminary time reference and one or more synchronization signals transmitted in the secondary cell; performing preliminary time reference based channel state measurements of the secondary cell based on the preliminary time reference and one or more reference signals transmitted in the secondary cell; setting, based on the synchronization signal based detection, a value of a channel quality indicator to either a nominal value or a value based on the preliminary time reference based channel state measurements; and transmitting a channel state information report comprising the channel quality indicator to the cellular communication network. An arrangement for a wireless communication device usable in a cellular communication network, adapted to attain time synchronization to a secondary cell of a carrier aggregation application is also disclosed. A modem comprising the arrangement and wireless communication device comprising the arrangement are also disclosed.

A system, a method and computer product for synchronizing of a femto cell with a macro cell, the method comprising: placing a forward link receiver into the femto cell; receiving by a micro cellular network the femto cell transmission timing; and synchronizing the femto cell transmission timing with the macro cellular network transmission timing in reliance on the forward link receiver signal. Further, a system, a method and computer product for allocating pilot phases to femto cells, the method comprising: creating at least as many new potential pilot phases for femto cells as there are for macro cells; and allowing a mobile device on a macro cell to search and find a femto cell pilot without explicitly listing femto pilot phases in the neighbor list.

The invention discloses an inter-cell synchronization method and a base station for saving resources of a system. The inter-cell synchronization method provided by the invention comprises the following steps: a non-synchronous cell periodically searches a synchronization signal from a synchronous cell within the bandwidth range of the synchronization signals of a system; and the non-synchronous cell carries out synchronization with the synchronous cell according to the searched synchronization signal from the synchronous cell. The base station provided by the invention comprises a periodic synchronization signal search unit which is used for periodically searching the synchronization signal from the synchronous cell within the bandwidth range of the synchronization signals of the system; and a periodic synchronization unit which is used for carrying out synchronization with the synchronous cell according to the searched synchronization signal from the synchronous cell. The method and the base station are used for implementing the inter-cell synchronization, thereby saving the resources of the system, simplifying the inter-cell synchronization process, reducing the inter-cell interference and improving the performances of the system.

The invention discloses an anti-interval-interference base station downlink pre-coding method for a multi-cell MIMO (Multiple-Input Multiple-Output) system. The method comprises the following implementation steps of: 1, positioning a cell user by using a GPS (Global Positioning System) and judging whether the cell user is a central user or an edge user; 2, if the cell user is a central user, estimating channel state information (CSI) and feeding the CSI back to a base station; 3, if the cell user is an edge user, estimating CSI relative to a local cell base station and an interference base station, and feeding back the CSI to the local cell base station; 4, transmitting the CSI of the edge user between the base stations; and 5, computing a pre-coding matrix of the user with a zero-forcingpre-coding method on the base station with cell interference. According to the method, the data exchange amount between the base stations can be reduced, the accuracy of the CSI can be ensured, and realization of cell synchronization is facilitated; and the method can be applied to a fourth generation mobile communication system.

A system and method for accommodating mobile station synchronization to neighbor cells in a mobile communication system. At least one available frame is utilized as a search window in an uplink data transfer multiframe for receiving neighboring cell synchronization information. At least one transmit time slot in a frame adjacent to the available frame in the uplink data transfer multiframe is surrendered to extend the search window. The neighboring cell synchronization information may then be contiguously received via the extended search window.

The present invention is directed to a neighbor cell synchronization method for a mobile communication unit. The method includes selecting a neighbor cell according to a scheduling mechanism; determining a synchronization window according to a communicating mode of the mobile communication unit; and searching or decoding specific logic channels within the synchronization window. The present invention also provides an apparatus for performing the method.

The invention discloses a buckwheat cell culture method for improving buckwheat cell synchronization. The method comprises the following steps: preprocessing buckwheat callus cells, inoculating the preprocessed buckwheat callus cells into different culture mediums, and performing multi-link synchronization induction treatment under different culture conditions. Therefore, the cells in different division periods can be adjusted to be in specific cell division period, the use efficiency of an inductor can be effectively improved, and the synthesis of secondary metabolites in the cultured cells is facilitated.

The invention discloses a web searching method and terminal, belonging to the field of a global system for mobile communications (GSM). The web searching method comprises the following steps of: measuring each frequency point to obtain frequency point energy; performing cell synchronization on corresponding cells of the frequency points in a sequence from large frequency point energy to small frequency point energy; after performing cell synchronization on each cell, judging whether the time difference between a first time point and a second time point is greater than or equal to the cell synchronization required time, wherein the first time point is the synchronization finish time of the latest cell on which cell synchronization is performed, and the second time point is the soonest time when the system message scheduling cycle of all the cells in a synchronized state arrives; if the time difference between the first time point and the second time point is greater than or equal to the cell synchronization required time, performing cell synchronization on the cell corresponding to the next frequently point; and if the time difference between the first time point and the second time point is less than the cell synchronization required time, waiting till the second time point and reading the system message when the second time point arrives. According to the web searching method disclosed by the invention, the synchronization tasks of other frequency points are performed in advance during the idle time after the synchronization is finished before the system message is read, thus increasing the web searching speed.

The invention discloses an inducing method for improving the cell synchronization of tendril-leaved fritillary bulbs, which belongs to the field of biotechnologies. The method disclosed by the invention is mainly implemented by carrying out synchronized inducing on the mitosis of tendril-leaved fritillary bulbs by using a helium gas blocking method and low-temperature induction. The inducing method can effectively improve the follow-up polyploidy inductivity thereof, solve the problem of variety degeneration occurring in the process of planting tendril-leaved fritillary bulbs, can obviously shorten the planting cycle, and then improve the yield and medicinal component contents of tendril-leaved fritillary bulbs. The method is simple in steps, stable in process, and suitable for industrialized large-scale production.

A mobile terminal slave mode frequency point measuring method and a mobile terminal slave mode frequency point measuring device are disclosed. The method comprises the following steps: the priority of all to-be-measured frequency points in a current measurement period is acquired; when a to-be-measured frequency point is a high-priority frequency point and no cell is found at the to-be-measured frequency point, if the number of measurement periods in which cell synchronization fails at the to-be-measured frequency point is greater than a preset value, the priority of the to-be-measured frequency point is decreased, and a punishment identifier corresponding to the to-be-measured frequency point is set; when a to-be-measured frequency point is a low-priority frequency point and no cell is found at the to-be-measured frequency point, if the to-be-measured frequency point has a punishment identifier and the duration from previous priority reducing operation to the current time reaches a preset length, the priority of the to-be-measured frequency point is increased; and measurement gaps are allocated for all the to-be-measured frequency points according to the adjusted priority of the to-be-measured frequency points, and frequency point measurement operation is performed. By using the method and the device, a cell with good signal quality can be found quickly.

The invention is directed to synchronizing a massive multiple-input multiple-output (MIMO) link between an access point (AP) and a contaminating AP. An exemplary method comprises: detecting, by an AP, a contaminating AP, wherein the contaminating AP interferes with communication between the AP and other UEs in communication with the AP; and extracting, by the AP, broadcasted pilot information from a first channel associated with a data frame, wherein the broadcasted pilot information is associated with the contaminating AP.

A network-side device and a macro base station to micro base station switching method relate to a universal mobile telecommunications system. The method includes: multiplexing part of scrambling codes in reserved scrambling codes to micro base station cells, and configuring them to a user equipment; a network side creating a SNF−SFN relation list between various base station cells according to existing determined neighbor cell relations and cell synchronization information in a measurement report reported by the user equipment; when the user equipment reports a switching measurement report of a target cell, the network side determining a target cell in actual switching and performing the switching according to the scrambling code information in the switching measurement report, TM and OFF information in the cell synchronization information and the SFN−SFN relation list. The embodiment of the present invention further discloses a network-side device.

The embodiment of the invention provides a cell synchronizing method, a device and a mobile terminal. The cell synchronizing method comprises the following steps: acquiring synchronizing information of a cell through a synchronizing channel; acquiring a cell frame number through the synchronizing information; judging whether the cell frame number accords with a frame number rule of the synchronizing channel; and if the cell frame number accords with the frame number rule of the synchronizing channel, synchronizing the cell through the synchronizing information. The cell synchronizing method, the device and the mobile terminal provided by the embodiment acquire the synchronizing information of the cell from the synchronizing channel, acquire the cell frame number through the synchronizing information, and judge whether the cell frame number accords with the frame number rule of the synchronizing channel so as to determine whether the synchronizing information of the cell is accurate through a convenient and quick mode and avoid error synchronizing information so as not to realize cell synchronization.