1374 results about "TD-SCDMA" patented technology

A method is disclosed that a Mobile Station MS performs at switch-on to search the most favorable target cell in UMTS systems like the 3GPP CDMA—LCR (Low Chip Rate) option at 1.28 Mcps—TDD (Time Division Duplex) mode and the equivalent TD-SCDMA (Time Division—Synchronous CDMA). Signal at the MS antenna is the sum of different RF downlink frames coming from different carriers in the assigned frequency ranges. A DL synchronization timeslot and a BCCH TS0 are both transmitted with full power in the frames, the first one includes one out of 32 SYNC codes assigned on cell basis. Following a conventional approach the absence of a common downlink pilot and without prior knowledge of the used frequencies would force the MS, for all the frequencies of the channel raster stored in the SIM card, the correlation of the received frame with all the 32 SYNCs stored in the MS, in order to detect the BSIC of a cell to which associate the power measures. Following the two-step method of the invention the power measures are performed in two-step scan of the PLMN band without interleaved correlation steps; once a final frequency is selected the respective frame is the only correlated one. At least one frame duration about 5 ms long of the whole 15 MHz bandwidth is acquired, IF converted, A/D converted and the digital set is stored. A rough scan is performed multiplying the digital set by a digital IF tuned in steps wide as the channel band (1.6 MHz) along the 15 MHz band, and filtering the baseband signal with a Root Raise Cosine low-pass filter. The 5 ms baseband signal is subdivided into 15 blocks of half timeslot (337.5 μs) and the power of each block is measured. The power of the strongest block indicates the priority of the respective frequency. The strongest power values are put in a Spectral Table together with respective frame load indicators. The load indicator is the percentage of timeslots in a frame almost equally loaded as the strongest block. The three strongest frequencies are selected for the successive scan. The second step search is performed like the first one but the IF steps are now 200 kHz wide and cover the only 1.6 MHz spectrum around a selected frequency. A final frequency is selected for the successive correlation step. Then the frequency error of the MS reference oscillator is corrected with data-aided techniques and a calibration value stored for successive connections (FIG. 9).

The invention provides a method for distributing power resource of a multi-carrier enhanced uplink, which includes the steps that: a wireless network controller configures maximum uplink transmitted power of a user terminal for a base station; the wireless network controller configures allowable maximum uplink transmitted power for the user terminal and expected reference received power of each carrier; the user terminal reports dispatching information including remained power of each carrier; the base station, after receiving the reported dispatching information from the user terminal, distributes power for each carrier according to the reported dispatching information and the maximum uplink transmitted power. Therefore, by adopting the method of the invention, the remained power of each carrier of UE can be concerned without transcending the capacity of the UE; furthermore, the method of the invention can be applied to a TD-SCDMA system.

The invention discloses remote video monitoring system and method suitable for 3G mobile network communication, relating to the field of remote control and monitoring. The invention realizes the purpose of remotely controlling or viewing a target scene in real time by connecting a mobile phone or a personal computer to one or more intelligent network cameras, wherein the mobile phone can be any 3Gsmart mobile phone which supports WCDMA, TD-SCDMA or CDMA2000, which guarantees the universality of remote monitoring. The intelligent monitoring system of the invention has the characteristics of convenient use, easy deploy, easy popularization, and the like and brings a new bright spot to security causes.

The invention relates to an antenna phase-shift system, in particular to a simultaneous transmission device which accurately adjusts a plurality of groups of beam-forming networks in a multi-array antenna, a beam-forming network which is suitable for the antenna phase-shift system, and a precise phase-adjusting measurement and control device. The simultaneous transmitting device is used in an antenna which is provided with at least two radiating element arrays, implements control and realizes simultaneous phase shift to a phase-shift part which is owned by the beam-forming network of each radiating element array, comprising a driving device, a connecting rod and a transmission device, wherein the driving device is under the control of a control system which is independent of the antenna and provides a circular motion arm, the connecting rod is flexibly connected with the phase-shift part of each beam-forming network and causes each beam-forming network to shift the phase in a linking way under the linear motion of the connecting rod, and the transmission device converts the circular motion arm of the driving device into the linear motion of the connecting rod. The whole antenna phase-shift system has compact structure and can realize simultaneous precise phase adjustment to the antenna, in particular to TD-SCDMA antenna.

An antenna multiplexing system and a method of a smart antenna and a Multiple-Input Multiple-Output antenna are provided, wherein the system includes a MIMO antenna array and a smart antenna array, the smart antenna array includes several groups of antenna array elements in which the distance between neighbor antenna array elements is less than or equal to one half of wavelength, and the smart antenna array comprises at least two groups of antenna array elements with the coherence sufficient for the requirement of the MIMO applications. The method includes: in accordance with the type of the data to be transmitted, determining a transmitting mode and processing the data to be transmitted accordingly, and in accordance with the transmitting mode, controlling the MIMO antenna array or smart antenna array, so as to transmitting the data to the mobile terminal. With the premise that the actual coverage of TD-SCDMA system should be further improved, the requirement of higher user throughout could be met, and the MIMO antenna system could satisfy the requirement of the future system evolution. Both of the applications of the MIMO and the smart antenna could be met with the use of the same antenna feeding system, and the adaptive switching of the MIMO and the smart antenna with respect to the user could be achieved.

The invention discloses a frequency offset and phase estimation method based on differential phase in TD-SCDMA communication system receiving synchronization; the invention uses fractional step estimation strategy of two periods of initial frequency offset estimation and precise frequency offset and phase estimation, combines and uses two groups of pilot frequency identifier sequences in present adjacent two sub-frames having related frequency offset, implements TD-SCDMA communication system frequency offset and phase estimation through differential phase calculation. The method has precise frequency offset and phase estimation under middle and high signal-to-noise ratio; fluctuation range of estimated value is less.

This invention discloses a method of reshuffling the master carrier frequency in multiply carrier wave area, which comprises the following steps: a) the node B find that the channel which charges the master frequency out of work, sending the notice to the radio network controller; b) the radio network controller will decide whether opening the master carrier frequency reshuffling procedure, if it is, go to the next step; c) opening the master carrier frequency reshuffling procedure, then the base station realize the master and stand-by carrier frequency reshuffling. By said method, the mobile terminal can get system information and other allocation information when the master carrier frequency out of work in the TD-SCDMA agreement standard.

A danger preventive apparatus employing a facial recognition technology and a danger preventive system using the same is provided. According to the present invention, the robbery of a vehicle, and various crimes and unexpected dangers within a vehicle can be prevented and eliminated by employing a facial recognition algorithm. Further, dangerous situations can be solved rapidly by automatically transmitting a driver's position information and pertinent images from an external danger prevention server to external helpers, such as police and emergency help institutes, through wireless Internet communication technologies such as Wibro (also called Mobile WiMAX), HSDPA & HSUPA, Long Term Evolution (LTE), Ultra Mobile Broadband (UMB), TD-SCDMA, TRS, GPRS (GSM) and CDMA, when the robbery or danger of a vehicle is sensed in the danger preventive apparatus.

This invention discloses a method for TD-SCDMA compatible with OFDM technology, which carries out serial parallel conversion to the due-out high speed serial code sheet sequence and generates multiple parallel sub-sequences to be modulated to multiple sub-carriers for parallel transmission to reduce the transmit rate of each channel so as to increase the symbol period and weaken the influence of multi-channel interference, at the same time, it uses the circular prefix as the protection interval, the interference among symbols are reduced greatly and the orthogonality among channels are ensured.

An apparatus and method are provided for simply estimating joint channel and Direction-of-Arrival (DOA) to efficiently estimate a channel impulse response associated with a spatially selective transmission channel occurring in a mobile radio channel, and performing efficient beam forming using the simplified joint channel and DOA estimation are provided. A receiver estimates the total interference power using power for each interference signal, estimates a spectral noise density, calculates steering vectors considering predetermined DOAs, and jointly calculates optimal weight vectors for each DOA of each user by applying the interference power and the spectral noise density to the steering vectors. The beam forming reduces implementation complexity of a TDD system such as a TD-SCDMA and increases beam forming efficiency in a mobile environment by efficiently using spatial diversity.

The method includes steps: determining assignable dynamic time slot resources and fixed time slot resources in frame structure of communication system; carrying out statistics for demanding of up going and down going bandwidths on small zone or cluster of small zone in a period of time preset; based on result of statistics, calculating parameters of reflecting demand relation between up going and down going bandwidths; based on the said parameters, allotting assignable dynamic time slot resources for up going and down going bandwidths. The invention realizes dynamic channel allocation at slow speed in TD_SCDMA.

The invention discloses a base station planning point automatic selection method. The method comprises the core steps that cell information of macro base stations is acquired, and a set A is obtained; the maximum value and the minimum value of cell longitudes and latitudes in the set A are calculated, and the maximum value and the minimum value are rounded according to the step length; the longitudes and the latitudes are segmented according to the step length from the minimum value to the maximum value; according to pairing of the longitudes and the latitudes, a set B is obtained; the attributes of the set B are initialized; grid ground feature information of the set B is acquired; an MR level value is acquired; the signal intensity of each grid in the set B is calculated, and the first three cells with the first three high signal intensities are obtained; the carrier-to-interference ratio of the grids in the set B are calculated; the attribute MR level values of the grids in the set B are calculated; the grids with the attribute MR level values smaller than a threshold value Xa and the carrier-to-interference ratios smaller than a threshold value Xb are searched for in the set B, and a poor coverage set D is obtained; aggregation processing is carried out on the grids of the set D, and the grids with the distances smaller than a threshold value are arranged in one set, so that a grid group set E is obtained; the center coordinates of the grid groups of the grid group set E are calculated, and a planning point coordinate set F is obtained.

The invention discloses a new electromagnetic radiation prediction method for a TD-SCDMA communication base station. The method comprises the steps of using a spectrum analyzer to measure maximum electromagnetic radiation intensity of a TD-SCDMA signal; building a service queuing model according to a channel resource distribution mode of a TD-SCDMA system, and computing probability distribution of the occupied downlink service slot; computing a duty ratio of the TD-SCDMA signal via the probability distribution of the occupied downlink service slot; and predicting the average electromagnetic radiation intensity of the TD-SCDMA communication base station based on the maximum electromagnetic radiation intensity and the duty ratio. According to the method provided by the invention, the service queuing model by analyzing the channel resource distribution mode of the TD-SCDMA system, the duty ratio of the transmitt4d signal is computed, and the average electromagnetic radiation intensity is predicted by using the maximum electromagnetic radiation intensity and the duty ratio of the TD-SCDMA signal. The method provided by the invention has a great reference value to build a TD-SCDMA communication base station, assess influence of an electromagnetic radiation environment and protect environment, and has excellent social benefit.

The invention provides road test software supporting a TD-SCDMA wireless access network, which can meet the requirements of the planning and optimization of the TD-SCDMA network in combination with a receiver and a GPS. The invention provides a method for calculating the performance parameter of the TD-SCDMA network and can intuitively and correctly reflect the quality of the network. The invention also provides a structuring thought of the TD-SCDMA road test software which comprises: an interface layer, which communicates with the receiver and the GPS, sends a network parameter value measured on the spot and geographical position information to an analytics layer; the analytics layer corresponds the geographical position information to the network parameter value one by one and classifies and reorganizes the TD-SCDMA network parameter value according to the standard set by users, thereby being capable of analyzing and diagnosing the state of the network measured in an intelligent manner; a presentation layer visually presents the classified and reorganized network parameter value and the analytic and diagnostic results of users in many ways, such as map, report form, and diagnostic listing presenting and so on. The invention also provides key technologies of propagation model correction, network coverage and test, data analysis and diagnosis, etc.

Some improvements to the conventional algorithms for data aided frequency synchronisation in cellular systems are introduced in a new method executable by the user equipments of various standards, i.e. 3GPP CDMA-TDMA, FDD mode at 3.84 Mcps, TDD mode at 3.84 Mcps, TDD mode at 1.28 Mcps; CWTS TD-SCDMA; GSM/DCS/GPRS. The method begins to obtain the suboptimal frequency errors Deltafi using a well known formula which calculates the argument of the autocorrelation over a subset of the baseband samples of the detected training sequence. The errors Deltafi are stored into a shift register L-position long and averaged to obtain an estimated frequency error Deltafi used for recursively correcting the reference frequency of the local oscillator, as: fi=fi-1+KDeltafi where K (0<=K<=1) is a weighting factor. Contrarily to the simple averaged error of the prior art, a sign criterion is used by which the average is performed on the only terms having the most recurrent algebraic sign among the stored terms Deltafi. The content of the shift register is corrected after each non-null frequency correction by subtracting K.Deltafi to all the stored terms Deltafi. Besides the frequency is corrected upon the following optional conditions, each other independents: The number of terms Deltafi having equal algebraic sign is greater than a constant alpha lower than L. The standard deviation sigma of the averaged terms Deltafi is lower than beta.sigmaold, being sigmaold the sigma of the last non-null frequency correction, and beta a constant >=1. After a minimum number gamma of iterations between two non-null frequency corrections are spent, being gamma a constant comprised between 1 and L. According to another variant the iterations of the recursive update are subdivided into an initial group with a higher K value for achieving fast convergence and a subsequent group with a lower K for achieving the required accuracy (FIG. 13).

An embodiment of the invention discloses a method for optimal selection between a WiFi (wireless fidelity) network and a TD-SCDMA (time division-synchronous code division multiple access) network. The method includes that user equipment detects a signal of the WiFi network; the user equipment requests for establishing a connection with the TD-SCDMA network when the intensity of the signal of the WiFi network is lower than -83db; the user equipment requests for establishing a physical connection with WiFi equipment when the intensity of the signal of the WiFi network is higher than -83db, an authentication request is initiated to the WiFi equipment, the connection between the user equipment and the WiFi equipment is established if authentication is successful, and a core network judges whether the user equipment needs to be switched from the WiFi network to the TD-SCDMA network or not; and the intensity of signals of the WiFi network is detected in every five seconds if the user equipment is successfully connected with the TD-SCDMA network. The method has the advantage that the optimal selection between the WiFi network and the TD-SCDMA network is realized.

The invention provides a method which applies multiple input multiple output technology in an outdoor macrocell of a TD-SCDMA system, wherein, the user equipment side is provided with at least two independent antennas and at least two independent antennas have the same launching power; the node B side is provided with array antennas; wherein, downlink supports single-stream mode launch under beam-forming mode and double-stream mode launch under pre-encoding mode, and the node B can carry out switch of the single-stream mode and the double-stream mode to user equipment.

This invention provides a down stream synchronous calibration method in TD-SCDMA system and its device. It includes following steps: receiving down stream signal. Looking up the down stream SYNC_DL to control the synchronous timing; using the midamble code of the above received signal to calculate the channel impulse response to regulate the synchronous timing; getting the channel impulse response and multiple correlation corresponding to DwPTS channel; getting the left edge of the channel impulse response to get the amount for regulating the synchronous timing calibration; further regulating and calibrating the synchronous timing. The device comprises: receiving device ; looking up device; control and calculation device; regulating device.

A method for determining whether to perform IFHO (inter-frequency handover) of a UF apparatus from one cell to another and from one carrier frequency to another in a TD-CDMA telecommunications network (including e.g. a TD-SCDMA network)—based separately on coverage and capacity, using one decision metric for coverage (e.g. based on received signal code power for each candidate cell and each candidate carrier frequency) and a different decision metric for capacity (e.g. based on a quantity proportional to the received signal code power and inversely proportional to the difference between a received signal strength indicator and the received signal code power). Corresponding equipment and a computer program product is also provided. In deciding whether IFHO is needed based on capacity, a threshold for received signal code power may be used in addition to the metric for capacity.

The invention provides an interference self-avoidance substation site selection method of a TD-LTE (TD-SCDMA Long Term Evolution) system, which is used for optimizing the site of a new substation so as to avoid same frequency interference between the new substation and a potential interfered substation. The method comprises: when a new substation is required to build and configure, obtaining the system information and configuration situation of each deployed substation; according to a preset screening criteria, determining the potential interfered substation from the deployed substations; according to potential interfered substation information (such as coverage area, service user number, user QoS (quality of service) requirements and the like), determining the priority level of each potential interfered substation; according to the priority level of each potential interfered substation, generating a list of the priority levels of the potential interfered substations; according to the near-end interference and far-end interference to the potential interfered substation by the new substation, determining the low-interference space between the new substation and each potential interfered substation; according to the list of the priority levels of the potential interfered substations and the low-interference space between the new substation and each potential interfered substation, determining the site selection area of the new substation.

The invention discloses a test method for performances of an intelligent antenna, and a device and a system thereof, which are applied to a TD-SCDMA (time division synchronous code division multiple access) system. The method comprises the steps as follows: an up useful signal and an up interfering signal are generated according to preset data and the generated signals are merged and then input to a channel simulation device; the channel simulation device configures channel simulation parameters for a plurality of channels, generates simulation signals of the plurality of channels and inputs the generated simulation signals to all receive ports corresponding to array elements of the intelligent antenna; the intelligent antenna analyzes the simulation signals and obtains a data bit stream of the simulation signals; and an RNC simulator compares the data bit stream of the simulation signals with the corresponding bit stream of the preset data and then obtains a BLER (block error rate) or a BER (bit error rate). The method for carrying out united test to a plurality of array elements of the intelligent antenna can simulate complicated network situations sufficiently so as to lead the test to receiving and demodulating performances of the antenna to be more objective and accurate.

This invention relates to a common physics signal channel distributing method based on multicarrier, which comprises the following steps: a) for every small area or sector, making sure one carrier wave as the first main carrier wave from the distributed N carrier waves, making sure another carrier wave as the second main carrier wave, the rest are assistant carrier waves, wherein one can be the alternate assistant carrier wave of the first or second main carrier wave; b) in the same small area or sector, the first and second main carrier wave, combined with the assistant carrier wave use the same interference code and the base train sequence; c) allocating the common physics signal channel in the first or second main carrier wave. Said method can overcome the disadvantages of TD-SCDMA communication system.

The invention discloses a method for realizing TD-SCDMA base station synchronization, which is used for synchronizing a base station in the absence of GPS signal and includes that: step1, a GPS receiver receives a GPS satellite signal and transmits pulse per second signal to a synchronization module; the synchronization module adopts the pulse per second signal to measure the deviation value of work frequency and standard frequency of a crystal oscillator, and compute the frequency deviation compensation of the crystal oscillator; step 2, when the GPS receiver receives no GPS satellite signal, the GPS receiver informs the synchronization module; when the synchronization module is informed that the GPS receiver receives no GPS satellite signal, the synchronization module adopts frequency deviation compensation to compensate a frame timing signal generated by a clock signal of the crystal oscillator, and the frame timing signal is used for synchronizing the base station. The invention can eliminate phase deviation caused by the frequency deviation of the crystal oscillator and continuously accumulated with time, and enable the frame timing signal of the base station to be synchronous with frame timing signals of other base stations in longer time.

A method for starting up TD-SCDMA radio data card on PC terminal includes reporting U disc to be optical disc based on successful enumeration of U disc, realizing automatic erection by fetching driving program file in U disc then fetching optical disc based on standard SCSI command set. The method for automatic-resetting TD-SCDMA radio data card is also disclosed.