Abstract: In the communication system performing transmission with generating the vacant period in the slotted mode during data transmission in order to perform various process, such as different frequency carrier quality measurement or so forth, the control signal for maintaining a communication quality is inserted even in the vacant period. Therefore, a link quality may not be degraded even if the vacant period is long. Namely, when the pilot signal is used as the control signal, even in the vacant period, measurement of the link quality of the forward link with the pilot signal is performed in the mobile station to report the result of measurement to the base station. Therefore, transmission power control of the forward link can be performed according to the report in the base station. Therefore, degradation of the forward link can be eliminated.

Abstract: An efficient framing scheme is described for the transmission of frame overhead data in next generation ADSL modems. As a result of this new framing scheme, the available data rate for the transmission of payload data increases. High payload data rates and consequently wider reach of the ADSL modem are the most important performance requirements and customer care-abouts for ADSL modems. This application explains the new framing scheme in detail and provides examples for the computation of the framing parameters.

Abstract: A process of generating an inter-packet gap in a network device is disclosed. First, it is determined whether a next packet is available to forward from a packet buffer. The number of tokens contained in a token bucket is checked and bytes are added to the inter-packet gap and tokens are added to the token bucket, when the number of tokens contained in a token bucket is less than a predetermined number of tokens. Otherwise, the size of the inter-packet gap is reduced and tokens are taken out of the token bucket, when the number of tokens contained in a token bucket is greater than or equal to the predetermined number of tokens. Thereafter, the inter-packet gap is supplied and sent with the next packet over an interface between the network device and a network.

Abstract: In the communication system performing transmission with generating the vacant period in the slotted mode during data transmission in order to perform various process, such as different frequency carrier quality measurement or so forth, the control signal for maintaining a communication quality is inserted even in the vacant period. Therefor, a link quality may not be degraded even if the vacant period is long. Namely, when the pilot signal is used as the control signal, even in the vacant period, measurement of the link quality of the forward link with the pilot signal is performed in the mobile station to report the result of measurement to the base station. Therefore, transmission power control of the forward link can be performed according to the report in the base station. Therefore, degradation of the forward link can be eliminated.

Abstract: An apparatus and method that allows for the automatic, real-time insertion of auxiliary data packets into a single or multi-channel bitstream in a satellite television broadcast system.

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: A method for packet bypass in a communications network includes receiving a plurality of packets, determining whether each packet is a bypass packet or a non-bypass packet, and communicating the non-bypass packets toward a communication link. The method also includes communicating a plurality of the bypass packets toward the communication link between communication of two of the non-bypass packets.

Abstract: A method of generating comfort noise in a communications includes selecting a packet of data from a stream of packets being received across a communications network, the packet comprising a selected number of data samples. Ones of the data samples from the selected packet are played out in a sequence as comfort noise to fill a dead gap. The sequence is reversed when a randomly selected sample in the packet is reached and corresponding ones of the data samples are transmitted across the network as comfort noise after the order is reversed.

Abstract: Block forming method and apparatus of a digital bit stream, in which such an inconvenience that in spite of the fact that additional data regarding a partial packet to be located at the end of a main data portion exists in an additional data portion, the partial packet becomes a block in which no byte actually exists can be eliminated. When a space area smaller than one packet occurs in the end portion of the main data portion of the data block, partial data of the next packet is stored in the space area, the additional data of the next packet is stored in the additional data portion as additional data of one partial packet and the remaining data of the partial data of the next packet is stored in a start portion of the main data portion of a next data block.

Abstract: In an embodiment, an apparatus includes a storage unit to store data from a data signal. The apparatus also includes control circuitry coupled to the storage unit. The control circuitry is to cause the storage of the data from the data signal into the storage unit at a nominal rate upon determining that the data signal includes a number of errors.

Abstract: A subscriber radio access system in which it becomes possible to facilitate communications for realizing high throughput and by which a radio LAN communication can be realized even if a radio link section is longer according to the CSMA protocol on Ethernet is provided. The subscriber radio access system includes plural transceiver terminals; and a base station linked to each of the plural transceiver terminals via a radio communication channel, wherein one of the plural transceiver terminals communicates to the other transceiver terminal with an Ethernet packet employing a carrier sense multiple access (CSMA) protocol, of which a packet length is corrected to correspond to a transmission delay time between the one and other transceiver.

Abstract: The invention relates to a TDM backplane bus system, in which a Frame Synchronisation signal is developed from an external communication signal, a data clock signal is produced from a free running clock oscillator independent of the FS signal, to select the frequency of the clock signal so that the number of periods within a frame is always at least one more than the number of timeslots required, to synchronise the FS signal to the CLK signal, and supply this synchronised Frame Synchronising signal (FS-S) to the TDM-bus. Further, the exceeding period(s) is identified by introducing a carry bit in the timeslot counters, the carry bit being set each time the counter(s) exceeds the number of timeslots on the TDM bus.

Abstract: A method and system for multiplexing high priority, low bandwidth information into a link carrying message passing information. The information is multiplexed in a way that keeps the two information streams and their associated hardware largely independent, but allows the most costly system components: the line drivers, receivers, and cables; to be shared by the two functions. The encoding chosen for the high priority information allows its insertion anywhere in the message passing data stream thus minimizing latency and jitter. The encoding is also a subset of the full 8B/10B encode/decode circuit, thus minimizing the extra hardware required.

Abstract: A method and apparatus for forming and processing an MPEG transport stream such that programs may be inserted into, or deleted from, the MPEG transport stream without significant retiming operations.

Abstract: A method for encapsulating and decapsulating information into a data packet being transmitted through a plurality of switches. The method has the steps of receiving a data packet in a first switch for transmission to a second switch and encapsulating information into a field of said data packet so that the information, when encapsulated into the data packet, does not increase the size of the data packet. The method also has the steps of transmitting the data packet having the information encapsulated in the data packet to the second switch and receiving the data packet having the information encapsulated in the data packet in the second switch. The final step is the step of decapsulating the information encapsulated in the data packet.

Abstract: An apparatus for replacing lost PSTN data in a packet network and for generating variable power white noise, includes a lost packet detection unit (402) for detecting lost data packets, a data processing unit (404) for producing in response a lost data output indicating when replacement data needed, data playout unit (408) or data replacement unit (406), each may be implemented as a variable power white noise generator (FIG. 3) to generate replacement data by reusing data stored in an extended playback buffer, and placing the re-used replacement data on an external network.

Abstract: A method and apparatus for transport encoded asset data and content data, multiplexing the transport encoded content data with a plurality of NULL transport packets to provide “place holder” for the asset data transport packets, and replacing the NULL transport packets with asset data transport packets prior to transmitting the multiplexed transport stream to a set top box.

Abstract: A communications system comprises a primary station (100) and at least one secondary station (101). The primary station (100) is arranged to broadcast a series of inquiry messages, each in the form of a plurality of predetermined data fields arranged according to a first communications protocol such as Bluetooth. In addition the primary station (100) adds to some or all of the inquiry messages an additional data field for polling one or more secondary stations, which can respond to the poll if they have data for transmission. This system provides secondary stations (101) with a rapid response time without the need for a permanently active communication link.

Abstract: A pipelined escape character insertion component sequentially includes a character specific gap inserter and an expansion component. The gap inserter inserts gaps into blocks of data in a received data stream in which data elements within the blocks correspond to control elements. The expansion component receives the blocks of data elements with the inserted gaps and rearranges the gaps to positions adjacent to the data elements that correspond to the control elements. Additionally, an escape character follows the expansion component and inserts escape characters in the inserted gaps.

Abstract: Process for transmitting status messages to user terminals of a satellite data transmission system that transmits data formed as navigation blocks. The process includes reserving at least one selected data area in the navigation data blocks, splitting status messages into status data blocks that are smaller than the navigation data blocks, inserting the status data blocks into consecutive reserved data areas of the navigation data blocks and inserting, when the status messages are modified, modification message data blocks into subsequent reserved data areas of the navigation data blocks in place of one or more status data blocks of the status messages. The instant abstract is neither intended to define the invention disclosed in this specification nor intended to limit the scope of the invention in any way.

Abstract: Block forming method and apparatus of a digital bit stream, in which such an inconvenience that in spite of the fact that additional data regarding a partial packet to be located at the end of a main data portion exists in an additional data portion, the partial packet becomes a block in which no byte actually exists can be eliminated. When a space area smaller than one packet occurs in the end portion of the main data portion of the data block, partial data of the next packet is stored in the space area, the additional data of the next packet is stored in the additional data portion as additional data of one partial packet and the remaining data of the partial data of the next packet is stored in a start portion of the main data portion of a next data block.

Abstract: A unit for receiving and re-transmitting data signals comprising multi-byte packets separated by multi-byte inter-packet gaps includes a FIFO store, a first, write, state machine for controlling the writing of packets into the FIFO and a second, read, state machine for controlling read-out of packets from the FIFO. The first state machine is controlled by a recovered clock and the second state machine is controlled by a local system clock. The first state machine is operative in a writing sequence to write into the FIFO the words of each received packet in successive locations and thereafter to cause the writing into the FIFO of a succession of idle bytes representing a selected inter-packet gap; and the second state machine is operative in response to maintain a reading sequence in arrears of the writing sequence by a selected number of said locations. The arrangement maintains the inter-packet gap despite slight differences between the recovered clock and the system clock.

Abstract: A mapping operation maps identified bytes of a transport overhead of a data stream to other unused areas of the overhead. A de-mapping operation maps the bytes mapped by the mapping operation back to the locations from which the bytes were moved. A passing operation is used to handle data stream transitions in which multiple tributaries are multiplexed into or out of a single connecting data stream.

Abstract: There is provided information processing apparatus/method featured by selecting the desired packets from input stream data containing plural packets multiplexed on time-division basis, counting the number of packets other than the desired packets in the input stream data, and recording, on a recording medium, the data of the desired packets and the information data indicating the number of the counted packets.

Abstract: A system and method for implementing a control channel in a packet switched communications network. In a computer network, such as a local area network (LAN) it is known to utilize the Ethernet for distributing communications between stations. The Ethernet employs a standard frame format that includes header frames and, in particular a preamble frame which may be used to provide synchronization information between switching devices or nodes. The preamble frame is not required in a Gigabit Ethernet implementation and the present invention employs a portion of the preamble frame to implement a control channel between switching devices.

Abstract: An apparatus (18) and method (100) provide RLP data checking. The apparatus (10) includes a frame serialization stage (20) and a bad frame filter (22) that detects possible bad frames and reclassifies these bad frames as erasures. In this manner, bad frame data are not passed to the RLP layer (16), and unnecessary resetting and resynchronization steps are avoided.

Abstract: In a digital broadcasting signal receiving/recording/reproducing apparatus, a recorded program can be immediately reproduced without performing complicated operations. Only a desired program and information related to the desired program are separated to be extracted from the digital broadcasting signal. Then, the separated/extracted broadcasting signal is supplied to a recording/reproducing apparatus. In the recording/reproducing apparatus, the supplied broadcasting signal is recorded, and the recorded program can be immediately reproduced without complicated manipulating operations during the signal reproducing operation.

Abstract: A method and device multiplexes a first transmission channel having a first transmission time interval for data unit transmission and at least one second transmission channel having a second transmission time interval for data unit transmission. A stream of placeholder bits is supplied to a channel multiplexing function of the at least one second transmission channel. The placeholder bits are then replaced at a later stage by an actual data stream of the first transmission channel.

Abstract: Transcoder apparatus is designed to transcode a receive signal (UR) into a transmit signal (UE). For this purpose, it includes a signaling transmitting member (14) for producing a signaling message and for introducing it into the transmit signal by stealing bits from said signal. According to the invention, the signaling transmitter member (14) also comprises a tone generator (15) to add a tone signal (UTS) to the transmit signal (UE) prior to applying the signaling message to said transmit signal.

Abstract: Many low bit rate digital audio encoding systems, including Dolby Digital and MPEG-2 AAC generate data streams in which unused dummy, fill, stuffing, or null bits exist whenever the bit allocation function in the encoder does not utilize all available bits from a bit pool. Instead, all or some of such wasted bits are used to carry information. This can be accomplished after an encoder generates a bitstream. The resulting bitstream is analyzed to identify the locations of some or all of the unused bits. Some or all of the identified unused bits are then replaced with information-carrying bits to embed information-carrying bits in locations formerly occupied by unused bits. Alternatively, instead of replacing some or all unused bits in the bitstream with information-carrying bits after encoding, a modified encoder may insert information-carrying bits in some or all of the unused bit positions during the encoding process.

Abstract: In the communication system which performs the data communication by the discrete multi-tone modem scheme between a plurality of data communication units using the time-division half-duplex communication function, the ratio between the data transmission time suitable for data communication and the quasi-data transmission time dynamically changes within one period. Further, bits are assigned in such a manner that the data of one period can be transmitted during the data transmission time of that period. Dummy bits are assigned to the portions of the data transmission time to which the data to be transmitted has not been assigned.

Abstract: A method of synchronising an Orthogonal Frequency Division Multiplexed (OFDM) IEEE 802.11a data packet at a receiver is disclosed. The 802.11a data packet has a series of short training sequence (STS) symbols as a preamble. Cross-correlation at the receiver of the STS in the 802.11a packet PLCP preamble with the modified reference STS, that is circular shifted by eight samples, results in a main correlation peak but with reduced pre- and post-lobes.

Abstract: A system and method are provided for encoding and decoding a bitstream according to the High level Data Link Control protocol (HDLC) without having to analyze the bitstream bit by bit. An optimized encoder and an optimized decoder are provided. Both encoder and decoder analyze their respective input streams by using a number of bits in parallel as an index into a table, the contents of which control an action by the encoder or decoder that emits in parallel a number of output bits.

Abstract: Clock information related to a reference clock is distributed from a master network node to a slave network node in an asynchronous packet-based network by embedding the clock information into an additional bit stream and multiplexing the additional bit stream with a primary data stream using an out-of-band channel. Multiplexing the additional bit stream with the primary bit stream using an out-of-band channel may involve selecting yB codes of an xB/yB encoded bit stream to represent bits of the additional bit stream or to balance the running disparity of the xB/yB encoded bit stream. The clock information that is embedded into the additional bit stream is used to generate a clock that is synchronized with a reference clock. In an embodiment, the clock information represents the time difference between a transmitted frame of the additional bit stream and a next edge of the reference clock.

Abstract: A networking method is disclosed. At least one silent slot is included in either a collision detection prefix disposed before a preamble of one or more frames of data to be transmitted across a media or in the one or more frames of data to be transmitted across the media. Transmission collision is detected during the at least one silent slot included. In one embodiment, the method is embodied in a network interface controller having a media access control block to control access to a media, and a physical signal block to physically signal data to be transmitted. The media access controller includes the at least one silent slot in either the collision detection prefix or in the data, and the physical signaling block performs the transmission collision detection during the included at least one silent slot.

Abstract: The management process of the invention is in particular intended for the temporal management of an ARINC 629 bus for avionics rigs, and it is characterized in that the rigs to which new information is not available or to which only inconsistent information is available are made to send substituted information (WS(2), WS(3)) furnished with characteristic identifications (S1, S2) at the send instants (TA) which are assigned thereto.

Abstract: A method and associated apparatus for embedding control information in a data signal to be transmitted over a data link by a network node. The method comprises generation of control information to be transmitted over a data link by a network node. A signal is generated by combining the control information with the data. In a first embodiment, the data includes individual temporal packets of information such that an interpacket gap is temporally defined between said temporal packets of information. Control information is transmitted within the interpacket gap. In a second embodiment, the data is transmitted within a prescribed frequency bandwidth such that a frequency gap is defined within the frequency bandwidth. Control information is transmitted within the frequency gap. The data handling capacity of the control information is maintained in both the first and the second embodiments.

Abstract: An Ethernet, or more generally any packetized network system, remote management device and system operable via Ethernet connections according to non-Ethernet message instructions presented during the active idle signal period, e.g. during the inter-packet gap (IPG), which are separated from the Ethernet signalling before detection. A locally managed device includes a physical layer interface adapted to receive a secondary signal which is encoded to provide a corresponding signal while conforming to the active idle and minimum IPG requirements, and is received by a remote device managed according to the encoded signals provided from the local device during the IPG. Further embodiments provide multiple (serial) nesting of such remote devices along the Ethernet path, with the instructions to and data from the most distant such remote devices forwarded through intermediate remote devices according to the present invention.

Abstract: The digital symbols of a sequence are assigned to respective positions in successive timeslots, according to a predetermined slot format. In a plurality of timeslots, a symbol of the sequence is replaced by a substitution symbol carrying additional information. A signal representing the sequence of symbols, which is divided into the timeslots, is transmitted on a communication channel. The production of the sequence includes an interleaving having an interleaving period longer than a timeslot, generally performed after a channel coding. The position of the substitution symbols in the timeslots which include them is varied, in order to optimize the performances of the transmission chain.

Abstract: The invention relates in particular to a TDMA transmission system including transmitters synchronized to a single receiver, each of the transmitters being able to transmit to the receiver on a given carrier frequency bursts with lengths which are all multiples of that of a unit burst including a guard time, the unit bursts including at least one guard time and the receiver being adapted to receive simultaneously bursts from different transmitters. According to the invention, each transmitter includes means for inserting a filler sequence into each burst to be transmitted at each location of the burst that is likely to correspond to a guard time in a burst received simultaneously on a different carrier frequency. The invention reduces the harmful effects of interference if the time of reception of the guard time of a burst on a first carrier frequency corresponds to the time of reception of information symbols in another burst received simultaneously on another carrier frequency.

Abstract: A method for providing and transmitting data in a data transmission system by transmitting several data blocks from a data-transmitting device to terminals. Before transmission of the data to the terminals an interleaving process of at least two data blocks is conducted. For the purpose of interleaving for each data unit of the data blocks, a transmission time is established with the help of an algorithm in such a way that for the transmission of k time critical data blocks with k=2, 3, 4, . . . and for one non-time critical data block, the transmission times of the data units of each time critical data block are respectively set at a fraction 1/k of the transmission time of the non-critical data block.

Abstract: A transceiver system and method in an OFDM communication system which enables exact symbol synchronization acquisition and improves performance for frequency offset and channel estimation. In the apparatus, a guard interval filling unit copies data at a predetermined interval in an input data row inputted to be transmitted, and fills in the copied data in the preset guard interval in the input data row. A selection unit selectively receives an output data row outputted from the guard interval filling means and unique words having a constant amplitude and a non-periodic auto-correlation characteristic, and outputs the OFDM symbol in which the unique words are inserted in the output data row.

Abstract: A system and method are disclosed for interleaving time-critical packets and lower-priority packets onto a common data link. A packet arrival prediction mechanism predicts when a time-critical packet is expected to arrive. When transmission of a waiting lower-priority packet might cause a substantial delay in the expected time-critical packet's transmission, the lower-priority packet is parked until it can be transmitted without interfering with a time-critical packet.

Abstract: An method of establishing a radio bearer (RB) resource in an RAN to support communication with a mobile terminal uses a radio bearer resource request message to expedite RB resource allocation. The mobile terminal transmits a packet channel access request message that uniquely identifies the access request type as a RB access request. The requested RB may be a signaling radio bearer (SRB), in which case the RB access request message may identify the specific type of SRB desired. More generally, the RB access request message identifies the access request type as a RB resource request, which is enough to alert the RAN that RB resources are required. The RAN then sends an uplink packet channel assignment and the mobile terminal specifies the RB resource details by transmitting RLC header information on the assigned uplink channel.

Abstract: A special rendering mode for the first few seconds of play out of multimedia data minimizes the delay caused by pre-buffering of data packets in multimedia streaming applications. Instead of pre-buffering all incoming data packets until a certain threshold is reached, the streaming application starts playing out some of the data packets immediately after the arrival of the first data packet. Immediate play out of the first data packet, for example, results in minimum delay between channel selection and perception, thereby allowing a user to quickly scan through all available channels to quickly get a notion of the content. The immediate play out is done at a reduced speed.

Abstract: A method 10 is provided to incorporate bit loading into a proprietary or other nonstandard mode, but with the constraint that all transmitted signals are valid packets that adhere to the standard in the sense that the transmitted signals could all arise in the regular standard. That is, it is desirable to confine the nonstandard nature of the transmission to the mapping of data bits to the transmitted waveform, rather than allow new transmission waveforms.

Abstract: The null packet insertion apparatus includes: a null packet remover for removing an irregularly inserted null packet from an externally received video/audio transport stream; a null packet bit rate calculator for calculating a bit rate of the removed null packet; a GUI for determining the transmission period of a periodic null packet to be newly inserted, based on the calculated bit rate, by an external user; a periodic null packet generator for generating a periodic null packet according to the determined transmission period; a multiplexer for regularly inserting the periodic null packet preferentially and inserting the video/audio transport stream with the irregular null packet removed, and performing multiplexing; a non-periodic null packet generator for generating a non-periodic null packet and inserting the generated non-periodic null packet, when an output rate of the multiplexed transport stream is not equal to an input rate of the externally received video/audio transport stream; and a PCR corrector f

Abstract: A channel configuration of a digital mobile system comprises two or more lower-rate transmission channels for each high-speed radio interface traffic channel at the network interface between a base station and an interworking function. Radio frames, such as EDGE frames, are transferred on a radio interface traffic channel. Transmission frames, such as TRAU frames, are transferred on transmission channels. The total data rate at the network interface is greater than the data rate at the radio interface. According to the invention, the total data rates of the network interface and the radio interface are rate-adapted by transferring fill data in transmission frames in addition to payload between the base station and the interworking function, such that the average data rate of the payload at the network interface corresponds to the total data rate at the radio interface, and the combined total data rate of the fill data and the payload corresponds to the total data rate at the network interface.

Abstract: A method and apparatus for handling data during link suspend pulse and the silent line state of a network device operating in a low power link suspend mode is presented. Accordingly, a new generation of network devices capable of operating in both the full power operational mode of prior art network devices, and a low power “link-suspend” operational mode are presented. The low power “link-suspend” (LS) mode reduces the power consumption of a LAN communications link at the physical layer by eliminating the need to continuously transmit standard idles to maintain link between two linked partners. In the LS mode, a low duty cycle “link-suspend-packet” (LSP) is transmitted between periods of silent line state (SLS). During the SLS, which is a non-data transmission period, the transmitter may be turned off to conserve power therefore preventing the receiver from immediately knowing the phase of an incoming data.

Abstract: A method is provided for manually synchronizing the playback of a digital audio broadcast on a plurality of network output devices. The method is applicable for use with methods such as those that use a time code, insert a control track pulse, or use an audio waveform sample for synchronization. The manual adjustment method relies on a graphical user interface for adjustment and audible pulses from the devices which are to be synchronized. The digital audio broadcast from multiple receivers does not present to a listener any audible delay or echo effect.