Abstract: A Universal Mobile Telephone System (UMTS) receiver performs slot synchronization using a received primary synchronization channel (PSCH). Subsequent to completion of slot synchronization, the UMTS receiver performs frame synchronization using a received secondary synchronization channel (SSCH) in such a way that the UMTS receiver uses the received primary synchronization channel (PSCH) to detect a change in channel conditions.

Abstract: Described are a system, method and device to synchronize block data received in a data stream where the data stream is received on set data word increments. A synchronization header in each of a plurality of consecutive data word increments may be detected in a common location of a set portion or window of each consecutive fixed word increment. The data stream may be slipped by a fixed bit quantity in response to detecting an absence of the synchronization header in the common location of the set portion of a received data word increment.

Abstract: A method for receiving data messages in communications systems having redundant network paths. Received data of a peripheral representation or image is routed to a node along at least two different network paths. This makes it possible to store a consistent peripheral representation or image in a memory (12) of a node, if there is a disturbance in the data transmission along one network path.

Abstract: The present invention is directed to the reduction of delays introduced in connection with packet data mixing operations. In particular, in accordance with an embodiment of the present invention, communication endpoints providing packet data to a mixer are provided with packetization time adjustment information, in order to synchronize the arrival times of data from different communication endpoints. The packetization time adjustment information may be in the form of an amount of time or number of samples by which the endpoints packetization time should be shifted. The packetization time adjustment information may be provided as additional header information provided as part of a packet containing data transmitted to a communication endpoint from the mixer.

Abstract: A mobile station capable of determining a SYNC_ID parameter for a base station serving said mobile station comprises: (i) a memory capable of storing prefix information and an associated SYNC_ID parameter; (ii) a transceiver capable of receiving identity information from the base station and transmitting the SYNC_ID parameter to the base station; and (iii) a controller capable of comparing the prefix information with the identity information, and in response to a match between the prefix information and the identity information, retrieving the SYNC_ID parameter associated with the prefix information.

Abstract: A device that synchronizes circuits over asynchronous links is disclosed. Some embodiments of the invention include a device that comprises a plurality of circuits. One of the plurality of circuits is designated as a “master” circuit. The master circuit is configured to send a first synchronization signal to one or more of the plurality of circuits, and each circuit that receives the first synchronization signal is configured to responsively send a second synchronization signal to one or more of the plurality of circuits.

Abstract: A method for shifting the position of a symbol to reduce transmission overhead is described. A frame with a plurality of symbols is provided. A determination is made whether the frame includes an indication of an event. At least one symbol of the plurality of symbols is shifted based on the determination. A counter is set to an initial value. The frame with the at least one shifted symbol is transmitted.

Abstract: A wireless device generates a peak profile for a primary synchronization channel (PSCH), and has a synchronization stage for performing code group identification and scrambling code identification. A first peak from the peak profile is chosen. The first peak has a first path position. The synchronization stage is handed the first path position to obtain a first code group number and a first code number associated with the first peak. A multi-path search window is then opened in the peak profile around the first path position. A second peak within the multi-path search window is selected, and a verification procedure is performed on this second peak to determine if the second peak has a code number that is identical to the first code number. The first code group number is assigned to the second peak if the code number of the second peak is identical to the first code number.

Abstract: A digital broadcasting system and a method of processing data are disclosed. The method of processing data includes grouping a plurality of enhanced data packets, each having information included therein, thereby creating a data group, creating and indicating an identification signal in a predetermined position of at least one enhanced data packet within the data group, the identification signal designating insertion of a field synchronization signal within a data frame, multiplexing the enhanced data packet of the data group and a main data packet, thereby creating a data frame, and inserting a field synchronization signal within the data frame based upon the enhanced data packet having the identification signal indicated therein.

Abstract: A timing control circuit includes a synchronous detecting portion which detects a synchronous pattern data of a received signal which has been demodulated based on a first control signal and generates a detection result, a first counter portion which generates a first signal at each first cycle based on the detection result, a second counter portion which generates a second signal at each second cycle based on the detection result, and a first control portion which generates the first control signal based on the first and second signals.

Abstract: In a first step, slot synchronization may be obtained by setting in correlation the received signal with a primary sequence, which represents the primary channel, and storing the received signal. During a second step, the correlator may be re-used for correlating the received signal with a secondary sequence corresponding to the secondary synchronization codes. The correlator may include a first filter and a second filter connected in series, which receive a first secondary sequence and a second secondary sequence, which may include Golay sequences. Architectures of parallel and serial types, as well as architectures designed for reusing further circuit parts are also disclosed. The invention is particularly applicable in mobile communication systems based upon standards such as UMTS, CDMA2000, IS95, and WBCDMA.

Abstract: In the case of radio base stations of different kinds, a synchronization in a radio section cannot be established so that the efficiently effective use of electric waves cannot be retained. According to the invention, therefore, there is provided a TDMA type mobile communication system 100 comprising: a plurality of radio base stations of different system kinds (i.e., a general type radio base station 1, an IP connection type radio base station 10 and a main digital cordless phone 2); mobile phones 5A and 5B wirelessly connected with the plural radio base stations; and a private branch exchange 4 wired with the radio base stations. The radio base station receives, when a synchronized operation mode is decided, a frame signal containing a control CH signal, from a reference radio base station (i.e.

Abstract: A method of processing a call with reduced call set-up times using one or more telecommunication networks includes providing one or more preferences for a call associated with a first terminal and a second terminal. The one or more preferences are associated with an initial setup of one or more media channels for the call. The method also includes processing the one or more preferences as a preference message, processing the preference message by an FEA procedure to provide an FEA preference message, and transferring a first framing synchronization flag sequence, the FEA preference message, and a second framing synchronization flag sequence from the first terminal to the second terminal. The method further includes receiving one or more acknowledgement preference messages from the second terminal, completing the initial setup of the one or more media channels, and thereafter, exchanging information between the first and second terminals.

Abstract: An element management system that can itself be used to perform automatic remote backup of the network elements. A backup procedure is launched on a programmed schedule, to maintain a centrally located copy of the local data stored in the network elements (or their subcomponents). In accordance with a particular embodiment of the present invention, a computer/software system for managing telecommunication network elements includes one or more operator-driven processes which monitor and manage network elements in real time, using at least one telecommunications network control channel. Background processes which remotely back-up information which had been locally stored in ones of said network is automatically initiated.

Abstract: A transport protocol data flow reconstruction method delays determination that a missing packet is lost for a period of time. For an evaluated TCP packet in a first direction, the method determines if a TCP packet is missing in a second direction, in which case the method stores the evaluated TCP packet in a list and creates an acknowledgement timer indicating a maximum time to wait until treating the missing TCP packet as lost. Expiration of the acknowledgment timer indicates a missing packet in the second direction. The method determines if a TCP packet is missing in the first direction, in which case the method stores the evaluated TCP packet in the list and creates a retransmission timer indicating a maximum time to wait until treating the missing TCP packet as lost. Expiration of the retransmission timer indicates a missing packet in the first direction.

Abstract: A VSB communication system or transmitter for processing supplemental data packets with MPEG-II data packets includes a VSB supplemental data processor and a VSB transmission system. The VSB supplemental data processor includes a Reed-Solomon coder for coding the supplemental data to be transmitted, a null sequence inserter for inserting a null sequence to an interleaved supplemental data for generating a predefined sequence, a header inserter for inserting an MPEG header to the supplemental data having the null sequence inserted therein, a multiplexer for multiplexing an MPEG data coded with the supplemental data having the MPEG header added thereto in a preset multiplexing ratio and units. The output of the multiplexer is provided to an 8T-VSB transmission system for modulating a data field from the multiplexer and transmitting the modulated data field to a VSB reception system.

Abstract: The CDMA communication device of the present invention includes a spreading unit, radio transmitters, and a control device that includes a setting unit and a determination unit. The spreading unit spreads and multiplexes user data of users. The radio transmitters are provided correspondingly to each of a plurality of frequencies, and modulate with the corresponding frequencies the user data that are supplied from the spreading unit. The determination unit determines the working frequency of users based on the spread factor value of the user data. The setting unit sets the spread factor of the user data in the spreading unit. The setting unit further performs setting of the spreading unit such that user data that have undergone spreading are supplied to the radio transmitter that has been provided correspondingly to the frequency determined by the determination unit.

Abstract: A method and apparatus of transmitting data at a line rate to a bus operating at a bus rate includes transmitting the data in a packet format having a plurality of frames each having a plurality of time slots. Each time slot has successive message groups, and each message group includes a plurality of data messages containing the data and an idle code containing none of the data. A number of idle codes in each frame is selected such that the bus rate matches the line rate. Various communication buses, and methods of synchronizing data are implemented.

Abstract: A method of a receiver determining the timing of a signal transmitted in a time-slotted manner, the signal comprising a sequence of information which is repeated at a known interval and has at least a known minimum length. The method performs correlation operations between groups of received slots of information, the groups spaced by the known interval. The groups are moved through the received signal, adding and removing slots, to locate a maximum correlation value sum for the group which should correspond to the timing of the slot. The method also can be used to determine a frequency offset at the receiver and/or an initial phase.

Abstract: The object of the invention is a method for emulating the two-way information flow of a real application in a system, which comprises a first network element (101) and a second network element (102), as well as a packet network (103) between said first network element and said second network element. The method comprises transmitting a set of packets from the first network element (101) through the packet network (103) to the second network element (102). At the second network element, at least part of the transmitted packets are received. In a return transmission, a packet arrived at the second network element is transmitted back to the first network element only after a selected delay from the receiving of the packet at the second network element. The object of the invention is also a system, a network element and a computer program product implementing the method.

Abstract: A system, method, and computer program product for synchronizing time between a centralized controller device and at least one subscriber device on an Ethernet Passive Optical Network (EPON). The MAC control layer of an EPON device is expanded, and additional messaging control is added via the transmission of Ethernet frames. The expansion prevents reliance on a physical layer signal. The time synchronization also allows a time stamp to be incorporated into a message. Thus, bandwidth is not wasted by simply transmitting a time stamp by itself. In an embodiment, the centralized controller device measures the time difference between the time at which a particular ranging request is transmitted and the time at which the particular ranging request is received. The time difference represents the time adjustment value for the particular subscriber device and allows the device to synchronize its time with that of the centralized controller device.

Abstract: An improved split-transaction bus intelligent logic analysis tool has a bus synchronizer, a decoder and a logic analysis function. The bus synchronizer is configured to receive link traffic and frame the link traffic into a plurality of framed packets, the plurality of framed packets including a plurality of request packets and a plurality of response packets. The decoder is configured to receive the plurality of framed packets and decode the plurality of framed packets into decoded packets, wherein at least one of the decoded packets includes information from a request packet and information from a corresponding response packet. The logic analysis function is configured to receive the decoded packets and initiate a trigger action on receipt of one of the decoded packets.

Abstract: In some embodiments, a method includes detecting a tone in each data frame of a sequence of telephony signal data frames. A first data frame of the sequence of telephony signal data frames may be transmitted immediately after detecting the tone therein. Transmission of a last one or last ones of the sequence of telephony signal data frames may be deferred. It may then be determined whether the tone is present in a next data frame that immediately follows the sequence of telephony signal data frames. If it is determined that the tone is not present in the next data frame, the last one or ones of the sequence of data frames and the next data frame may be transmitted. If it is determined that the tone is present in the next data frame, a respective replacement data frame may be transmitted in place of each one of the last one or last ones of the sequence of data frames and in place of the next data frame.

Abstract: The portion of TDMA frames otherwise containing the sync word is eliminated for one or more data frames at the end of a TDMA data burst to provided added bandwidth for data payload or for a reduced bandwidth. Once a communication channel has been established and is in steady state mode (after receipt of one or more frames), the sync word is eliminated from the remaining frame structure. Drift of a local clock with respect to an incoming data stream is monitored using an oversampled or multiplied master clock to provide suitable resolution to determine an approximate position of an active edge of the master clock with respect to a bit or symbol being clocked. Any drift from center results in an adjustment of the local master clock. In a preferred embodiment, the drift is measured in a last bit or symbol of a received TDMA burst, and the master clock is adjusted to re-center the local master clock with respect to that last bit.

Abstract: In a frame sync method, a receiver searches for the presence of an N-symbol long unique word pattern. For each possible frame sync detected, the receiver proceeds to demodulation and FEC processing. After each iteration of the FEC decoder, the detected unique word pattern is compared to the expected one and the frame sync is detected if the number of unique word errors has decreased.

Abstract: A system receives input data frames that are configured according to a SONET or an SDH standard. The input data is converted to parallel data. The system provides groups of bits along parallel signal lines. In each group of bits, N contiguous bits in the group form a complete word of input data. The system identifies the boundary between complete words in the input data by comparing subsets of the bits to predefined framing patterns. The system then aligns the input data based on the location of each word using the boundary information. The output data of the system includes data that is word aligned. The system can also detect boundaries between the frames.

Abstract: According to the present invention, all terminals can establish synchronization in a radio communications system formed only of a plurality of mobile terminals. This radio terminal communicates by the time division connection method, and comprises a control portion for synchronizing its transmission/reception timing to that of a group including a plurality of radio terminals.

Abstract: A data processing apparatus according an aspect of this invention has a syndrome calculation unit configured to calculate the syndrome of a demodulated data sequence. The syndrome calculation unit includes a calculation unit configured to make the calculation required to realize syndrome calculation of demodulated data for each frame obtained by removing the sync code from one sync frame.

Abstract: A multiplex transmission system according to the invention includes a transmitter and a receiver. The transmitter is provided with an idle frame inserting unit that inserts a specific idle frame different from an idle frame inserted into a surplus band of another signal into a surplus band of a predetermined signal and generates an internal signal, a multiplexing unit that multiplexes internal signals by time division and generates a multiplexed signal and a framing unit that transmits the multiplexed signal to a transmission line interface.

Abstract: A method of switching from a first to a second transport channel for User Equipment (UE) in a UMTS Terrestrial Radio Access Network (UTRAN) of a UMTS system. The method comprises initiating a channel switch, and initiating a synchronisation of the UE to the second channel. The first channel is maintained during the synchronisation phase such that data may be sent between the UE and UTRAN over the first channel during synchronisation. The first channel is terminated only after synchronisation of the UE to the second channel has been achieved.

Abstract: A method, apparatus and article of manufacture is provided for processing a previously encoded MPEG video high-resolution (HR) file and corresponding proxy file, for frame accurate timecode repair and synchronization of individual video frames of the HR and proxy files. Each video frame header of the HR and proxy files is modified by a compressed timecode packet having an identifying signature, an absolute timecode of the frame, and a relative timecode of the frame. The timecodes have the SMPTE timecode format HH:MM:SS:FF. The method automatically verifies the timecodes in the HR and proxy files timecode packets. If a repair of the HR file anomalous absolute timecodes is needed, the method automatically corrects the anomalous absolute timecodes in the HR file. If the proxy file starting video frame is offset from the HR file starting video frame, the method automatically synchronizes the proxy and the HR files absolute and relative timecodes.

Abstract: A system and method have been provided for translating digitally wrapped communications between networks using different protocols. This invention makes use of an integrated circuit (IC) relay with programmable features to modify the locations and functions of overhead bytes between the receive and transmit sides of the device, permitting two dissimilar networks to be bridged. That is, the IC relay converts frame formatting from one frame structure to another, so that incompatible networks can communicate.

Abstract: In a transmission system with a transmitter coupled to a receiver a main signal encoded according to a coding property is transmitted together with an auxiliary signal (AUX). In order to transmit the auxiliary signal without needing additional space in the the transmission frame, the auxiliary signal is transmitted by changing the coding property according to a predetermined sequence. This is done by means of the sequencer. In the receiver the decoding of the predetermined sequence is performed by a decoder.

Abstract: In a synchronous digital communications system a network of SDH (or SONET) equipments (SE) are arranged to exchange synchronisation signals via ports on the SEs, each port being allocated a source identifier (SID). These SIDs are used to identify the source of each synchronisation signal input at a particular SE. When the SE selects a synchronisation signal to transmit out of its ports, the SID associated with that selected signal is compared with SID of each port. If a match is found the synchronisation status message (SSM) associated with the synchronisation signal sent out at that port is set to “Do Not Use” (DNU) to warn the destination SE that the synchronisation signal has been looped back. Each SE is allocated a unique equipment identifier. The SID of each port is set to the unique SE identifier of SE to which it is directly connected.

Abstract: The invention relates to a time-alignment apparatus and a time-alignment method of a transmitter (TX) of a telecommunication system TELE. Successive data frames (ch1/0, ch2/0, ch3/0, ch4/0, ch8/0, ch300/0) are written to one or two frame memories (RAM1, RAM2) starting at a respective frame start write address (FRST-ADRchy). A third frame memory (RAM3) having a read state is read out in the column direction such that one data symbol of each storage resource (RES1, RES2 . . . RES300) can be output to a modulator unit (BBTX) of the transmitter (TX). The read/write state (WR/RD) of the three frame memories (RAM1, RAM2, RAM3) is cyclically switched through a first to third alignment mode (M1, M2, M3) such that always a first write state memory (RAM1) and a second write state memory (RAM2) are provided. An interleaving process can be carried out together with the time-offset adjustment if the storage resource is constituted by an interleaving matrix.

Abstract: A correlation between a received signal and a sync word signal is calculated. A window signal having a time span which is equal to an equalization range for an adaptive equalizer is defined. A power sum of the correlation output signal in each of window signals #1, #2, #3, . . . are calculated by sequentially shifting the window signal in the time domain, and a rising edge of the particular window signal whose power sum maximum defines a symbol sync timing.

Abstract: A method of a receiver determining the timing of a signal transmitted in a time-slotted manner, the signal comprising a sequence of information which is repeated at a known interval and has at least a known minimum length. The method performs correlation operations between groups of received slots of information, the groups spaced by the known interval. The groups are moved through the received signal, adding and removing slots, to locate a maximum correlation value sum for the group which should correspond to the timing of the slot. The method also can be used to determine a frequency offset at the receiver and/or an initial phase.

Abstract: A wireless transmitter (TX1). The transmitter comprises circuitry for providing a plurality of control bits (CONTROL) and circuitry for providing a plurality of user bits (USER). The transmitter further comprises circuitry (16) for modulating the plurality of control bits and the plurality of user bits into a stream of complex symbols and circuitry (18) for converting the stream of complex symbols into a parallel plurality of complex symbol streams. The transmitter further comprises circuitry (20) for performing an inverse fast Fourier transform on the parallel plurality of complex symbol streams to form a parallel plurality of OFDM symbols and circuitry (22) for converting the parallel plurality of OFDM symbols into a serial stream of OFDM symbols. The serial stream consists of an integer N+1 OFDM symbols. Each OFDM symbol in the serial stream of OFDM symbols comprises a plurality of data points. Finally, selected OFDM symbols (SF1.

Abstract: A method enables the introduction of a 200 kHz GSM-type network into a TDMA system having a bandwidth that is substantially less than a 2.5 MHz bandwidth normally employed for GSM-type networks. The method provides a 52-multiframe containing 12 blocks of four consecutive frames, two idle frames, and two control channels, and rotates the control channels belonging to a serving time group over odd timeslot numbers as 7, 5, 3, 1, 7, 5, . . . , etc. Preferably the rotation occurs between frame numbers (FN) mod 52=3 and 4. Information specifying at least the rotation direction is signalled to the mobile station in a downlink synchronization channel.

Abstract: The time required for switch the channel can be remarkably curtailed. When broadcasting signals through a plurality of information channels with an OFDM system, the plurality of information channels are multiplexed in the sense of frequency and collectively subjected to IFFT modulation for connected transmission instead of subjecting the plurality of information channels independently to OFDM modulation for transmission. With this arrangement, the efficiency of exploitation of frequencies is improved. According to the invention, the OFDM frames are synchronized for each information channel for the purpose of connected transmission. Then, the OFDM receiver can switch the information channel for signal reception, maintaining the frame synchronizing signals.

Abstract: A synchronization protecting and setting system for signals received in a radio base station whereby a protection of synchronized word SW detected in a first synchronized word detecting window AP1 can be maintained in a second synchronized word detecting window AP2 is provided.

Abstract: Briefly, in accordance with one embodiment of the invention, a verifier and a method for verifying synchronization of at least one pilot signal pattern of a wireless communication system are disclosed. A method and a module of frequency acquisition are also disclosed.

Abstract: A method and system for acquiring a time division multiplexed synchronization signal in a satellite communication system is provided. The signal is provided as a series of frames with beacon signals time division multiplexed into at least one time slot of each frame. The beacon signal in each frame comprises a unique word sequence, which is the same in each frame, and a portion of a PN sequence. The entire PN sequence is distributed into a plurality of frames forming a superframe. Initially, the power level of the incoming signal is determined by locating the maximum power received in half time slot intervals. Next a series of frames are correlated against the expected unique word, each at one of a plurality of possible frequencies. The frequency generating the maximum correlation with the unique word is selected.

Abstract: The present invention refers to a method and an apparatus for synchronizing operation at a node of a communication network. According to the invention a phase relationship between an output frame synchronization signal and an input frame synchronization signal is controlled by the adjustment of a phase difference between the output frame synchronization signal and a node synchronization signal.

Abstract: A method is provided for organizing a communications frame structure with selectable synchronization words. The frame structure includes a header section for overhead bits. The number of bits, position of those bits, and the content of the bits used for synchronization of the frame structure are selected from the header section for use in transmitting information. On the receiving end of the transmission, the same number, position, and content of bits are selected to synchronize the received information stream. A communications repeater and system using the above-described selectable frame synchronization structure method is also provided.

Abstract: Systems and methods are disclosed for time synchronization of operations in a control system. Synchronization networks and devices are provided for transferring synchronization information between controllers in a distributed or localized control system, which is employed in order to allow operation of such controllers to be synchronized with respect to time. Also disclosed are synchronization protocols and hardware apparatus employed in synchronizing control operations in a control system.

Abstract: A method and apparatus for data communication using signature sequences and spread spectrum techniques to reduce the effects of certain transmission impairments in a Wireless local area network (WLAN). The invention uses a number of correlators and M-ary Code Keying with a Supergold signature sequence for simultaneously generating a periodic signal for acquiring symbol synchronization, a difference squarewave signal for acquiring and maintaining chip synchronization and a sum signal for determining received signal strength and setting threshold levels.

Abstract: A method for scheduling the delivery of multimedia data packets over a communications medium with a limited bandwidth. The packets may contain data representing images, sounds, or other media which are to be delivered from a source or server to a recipient or client. The 6 method described here minimizes the delay between the point in time when a client requests the multimedia data and the point in time when the client may start presenting the data without risk of interruption, for a given communications bandwidth. This method also determines the minimum buffer sizes needed by the client in order to present this multimedia data subject to the specified bandwidth limit.

Abstract: An apparatus comprising a memory, an encoder and one or more registers. The memory may be configured to (i) read and/or write a plurality of state vectors and (ii) read and/or write data. The encoder may be configured to present state vectors to be written in response to (i) data read from the memory (ii) a first address and (iii) a serial data stream. The registers may be configured to present the first address in response to an input address.

Abstract: A method for presenting information to a mobile station that is transmitted during a common idle frame that consists of a set of time slots, comprising arranging individual transmissions such that the mobile station is enabled to receive all pertinent information from a subset of timeslots of the idle frame, without regard for what traffic time slot or slots the mobile station is assigned to. The individual transmissions originate from individual ones of a plurality of base stations, and the base stations are operated so as to alternate or rotate the transmission of bursts within the idle frame. Depending on a number of different bursts to be sent, a particular burst transmitted from one base station is never transmitted in the same time slot during two consecutive idle frames. In a presently preferred, but not limiting, embodiment of this invention the bursts are SCH bursts transmitted from base stations in a synchronous GSM telecommunications system.