127 results about "Channel rate" patented technology

A system and method for real time transmission of variable bit rate MPEG video traffic with consistent quality, wherein each frame is encoded with quantization parameter generated from an encoder rate controller, and encoded data is transmitted to an encoder buffer. Transmission rate about each frame interval is determined by a channel rate controller at the beginning of the frame interval. Data transmission buffered at the encoder buffer is first regulated by Leaky Bucket counter, and the regulated data is transferred to a decoder buffer in a video receiving system through network. The encoder rate controller and channel rate controller included in the VBR video transmission system control the transmission rate generated from the video encoder and that from the network with satisfying imposed constrained conditions, respectively.

An Ethernet architecture is provided for connecting a computer system or other network entity to a dedicated Ethernet network medium. The network interface enables the transmission and receipt of data by striping individual Ethernet frames across a plurality of logical channels and may thus operate at substantially the sum of the individual channel rates. Each channel may be conveyed by a separate conductor (e.g., in a bundle) or the channels may be carried simultaneously on a shared medium (e.g., an electrical or optical conductor that employs a form of multiplexing). On a sending station, a distributor within the sender's network interface receives Ethernet frames (e.g., from a MAC) and distributes frame bytes in a round-robin fashion on the plurality of channels. Each “mini-frame” is separately framed and encoded for transmission across its channel. On a receiving station, the receiver's network interface includes a collector for collecting the multiple mini-frames (e.g., after decoding) and reconstructing the frame's byte stream (e.g., for transfer to the receiver's MAC). The first and last bytes of each frame and mini-frame are marked for ease of recognition. Multiple unique idle symbols may be employed for transmission during inter-packet gaps to facilitate the collector's synchronization of the multiple channels and/or enhance error detection. A maximum channel skew is specified, and each received channel may be buffered with an elasticity that is proportional to the maximum skew so that significant propagation delay may be encountered between channels without disrupting communications.

A coding system and method for a terminal including a multi-rate codec is disclosed. The terminal includes a multi-rate adaptive coder that is capable of transmitting a continuous voice stream transmission at a source code bit rate and a channel code bit rate. A quality of service probing module probes an end-to-end network path of the continuous voice stream transmission to obtain at least one quality of service parameter. A quality of service management module determines at least one constraint associated with the continuous voice stream transmission. An adaptive bit rate algorithm module dynamically adjusts the source code bit rate and the channel code bit rate as a function of the quality of service parameter and the constraint to obtain a maximum value of perceived user performance during the continuous voice stream transmission.

Mobile terminal 100 has: operator 251 that calculates the generation interval of ACK packets based on the size of the ACK packet that is to be transmitted and the channel rate of the transmitting channel, held in controller 250; delay ACK timer 223 that repeats counting the calculated ACK packet generation interval as one period and outputs an expiration signal every time the one period expires; and data packet receiver 221 that, every time the expiration signal is input, generates an ACK packet containing the latest reception confirmation information relating to data packets received while the expiration signal was being received, and transmits the ACK packet to transmission buffer 240 via IP section 210.

An enhanced radio link protocol (RLP) in a wireless access network that is network aware is disclosed. The RLP increases radio link quality by various ARQ mechanisms. The RLP framing structure is included that supports and enables at least network layer packet boundary detection, dynamic and adaptive ARO schemes for QoS support on a per-packet basis, and a flexible RLP frame structure for fast adaptation to physical layer channel rate/RLP frame sizes. Optional uses include supporting negative acknowledgment (NAK) based ARQ.

Reverse link flow control in a high data rate network determines current reverse link data channel rates for access terminals served by a network sector to identify corresponding defined channel gains, which are used to rapidly and reliably estimate total sector interference on the reverse link. Total sector interference indicates reverse link capacity utilization, and when remaining capacity approaches a defined threshold, the sector sets an activity indicator to a busy state indicating reverse link congestion. This action causes at least some access terminals to reduce their reverse link data channel rate. Interference calculation techniques preferably involve baseband digital processing using defined channel gains, permitting rapid evaluation of reverse link capacity and quick, reliable activity indicator updating, which increases reverse link capacity utilization. These techniques may be applied to inter-sector control, wherein the reverse activity indicator status for one sector depends on interference in one or more other sectors.

The invention discloses a multichannel cooperative data transmission method and system. The method of the invention comprises the following steps: a sender sends a cooperative request-to-send (CRTS) packet carrying a data channel number to a receiver through a first control channel; after the receiver receives the CRTS packet, if the acquired data channel is judged to be usable, the receiver returns a conditional clear-to-send (CCTS) packet carrying the highest channel rate between the receiver and the sender to the sender; a candidate cooperative node intercepts the CRTS packet and the CCTS packet, and if the acquired data channel is judged to be usable and the cooperation condition is met, the candidate cooperative node sends a high (HI) packet according to access time delay; if the receiver only receives the HI packet, the receiver sends a relay acknowledgement (RACK) packet on the first control channel to disclose the cooperative node; if the sender receives the RACK packet, the sender sends a data packet to the receiver through the cooperative node; and after the receiver successfully receives the data packet, the receiver returns an acknowledgement packet through a second control channel. The invention can be used to realize efficient and reliable data transmission.

Disclosed is a method and apparatus for improved self-healing in a mobile ad-hoc wireless network in which network communication functions are divided into a plurality of functional layers. The system utilizes cross-layer self-healing techniques. Network data from at least one of the functional layers is stored, for example in a storage unit of the network node. The stored network data is then used to modify the functioning of at least one of the other layers. In one embodiment, a management module manages the storage and use of the network data. In particular embodiments, the stored network data relates to successful transmission rates and/or clear channel rates, and this stored data is used to adjust the transmission power of the network node. In another embodiment, the stored data may be used to generate a table of interchangeable network nodes, which may then be used to reroute a data packet to a network node other than an originally specified destination node. In yet another embodiment, the stored data may be used to generate a list of recent neighbor nodes, which data may be used to reroute data packets to intermediate network nodes.

Disclosed is a method for controlling reverse transmission power in a cellular mobile communication system. A base station measures interference in a cell divided into a plurality of beamforming areas, determines an Interference Availability Bit (IAB) of a specific area where the measured interference is greater than or less than a threshold, and forms a beam so as to transmit the determined IAB to a beamforming area including the specific area. A terminal receiving the formed beam receives the IAB, and controls reverse transmission power according to the received IAB.

A system and method to establish an end-to-end error correcting protocol between two voice band data modems over a network including voice band data relay gateways, where part of the end-to-end connection is via low data rate narrowband network. Using a partial implementation of V.42 LAPM protocol within the data relay gateways, the system allows the independent selection of modulation schemes at each gateway as well as increased user data throughput by removing non-informational data. Flow control of the user data to match the channel rate of the narrowband network may also be provided.

Downlink traffic channel data rate options and methods of indicating to a wireless terminal a utilized downlink data rate option are described. The downlink traffic channel rate option for a segment is conveyed using an assignment signal and/or a block in the downlink traffic channel segment which is not used for user data. Downlink segment assignment signals in some implementations allocate fewer bits for rate option indication than are required to uniquely identify each option. In some implementations low rate options, e.g., using QPSK, are uniquely identified via assignment signals. Higher rate options, e.g., using QAM16 modulation, are conveyed via the distinct information block in the downlink traffic segment using a first coding/modulation method. Still higher rate options, e.g., using QAM16, QAM64, or QAM256, are conveyed via the information block in the segment using a second coding/modulation method which is applied to the rate option information.

The invention relates to a multifunctional optical signal processing system. In the system, continuous detection light and signal light are combined through a first coupler and injected into a high nonlinear optical fiber; idle light generated in the high nonlinear optical fiber due to a fourwave mixing effect is divided into two paths through an optical filter and an optical coupler and are output, wherein one output path is connected to an optical power meter, the optical power output performs feedback control on a tunable dispersion compensator so as to realize dynamic dispersion compensation, while the other output path is used as a system output signal to generate an optical signal with high extinction ratio and no dispersion; and the wavelength of the output optical signal is changed by regulating the wavelength of the detection light, so that tunable wavelength conversion is realized. The multifunctional optical signal processing system can realize HNLF (High Nonlinear Fiber), dispersion detection, extinction ratio enhancement and wavelength conversion, has the advantages of multifunction integration, high response speed, high sensitivity of dispersion detection, wide working wave band and transparency to signal speed and modulation format and can be applied to an optical transmission system with channel rate of over 40Gb/s.

Selective intra and/or inter-prediction video encoding. Based upon anticipation of a future communication channel rate (e.g., actual physical layer channel rate) or video data rate of a communication channel, a given prediction mode for video encoding may be adaptively selected. Prediction of a future or expected value corresponding to at least one parameter associated with the communication channel (e.g., channel rate, video data rate, etc.) can drive operational mode selection/adaptation in accordance with video coding. Alternatively, one or more actual measured values corresponding to at least one parameter can drive operational mode selection/adaptation in accordance with video coding. In some instances, neither intra-prediction nor inter-prediction is performed in accordance with a non-feedback operational mode, and an input video signal undergoes compression (e.g., without intra-prediction and/or inter-prediction). Transitioning between various video coding operational modes may be made in different manners and based on different criteria as desired in various given applications.

The invention relates to an all-optical dispersion monitor based on an optical parameter amplifier. The all-optical dispersion monitor comprises a semiconductor laser, a coupler, the optical parameter amplifier, an output optical filter and an optical power meter. The semiconductor laser emits low-power continuous detection light. The continuous detection light and signal light are combined through the coupler and are filled into the optical parameter amplifier. The optical parameter amplifier is based on first-order four-wave mixing effect which causes energy to be transferred to detection waves and idle waves from the signal light. The detection waves and the idle waves with exponential gains are output, pass through the output optical filter and are measured by the optical power meter. The invention has the advantages that the response speed is fast, the sensitivity is high, the working waveband is wide, the signal rate and the modulation format are transparent, the monitor can be used for the dispersion monitoring of a WDM system with single channel rate above 100Gb/s, the high-speed photoelectric device and the signal processing circuit are not required during measurement, and the cost of devices is reduced.

The invention discloses a playing method and device of videos issued by a server, so that the playing quality of the videos is improved. The method comprises the following steps: acquiring an upper threshold and a lower threshold of a buffer area used for storing video frames, wherein the upper threshold and the lower threshold are determined according to the channel rate of a network; if the current buffer data volume in the buffer area is less than the lower threshold, decreasing the playing rate of the video frames, wherein if the buffer data volumes in the buffer area at adjacent moments are unequal and are both less than the lower threshold, the change rate of the playing rates of the video frames at the adjacent moments is in direct proportion to the size of the buffer data volume in the buffer area; if the current buffer data volume in the buffer area is more than the upper threshold, increasing the playing rate of the video frames, wherein if the buffer data volumes in the buffer area at the adjacent moments are unequal and are both more than the upper threshold, the change rate of the playing rates of the video frames at the adjacent moments is in direct proportion to the size of the buffer data volume in the buffer area.

The invention discloses a control method and a device of every space subchannel rate and power, the method comprises: receiver determinates modulation coding chose by every space subchannel according to the receiver side channel state information; the modulation coding which is chosen by the receiver is noticed to transmitter with index; pre-coding is carried out by the receiver According to channel state information statistics and the subchannel modulation coding. The invention returns only the 'index', not the channel state information real-time, thus reducing bandwidth demand of feedback channel. The invention pre-cods using channel state information statistical information, such as mean, variance matrix or related matrix parameters, thus reducing sensitivity pre-coding system performance to channel state information error.

The present invention provides a method and apparatus for maximizing throughput of a data call in a wireless communication system in which data is transmitted from a wireless station, such as a mobile station, on multiple assigned channels in accordance with a known transmission standard, such as IS-95B. The multiple assigned channels include a fundamental channel and at least one supplemental channel. Data is formatted into variable rate data frames and transmitted on the fundamental channel and the supplemental channel. A wireless receiver, such as a base station, receives the multiple assigned channels. The wireless receiver demodulates and decodes data frames associated with each of the multiple assigned channels. The wireless receiver determines a likely initial data rate for each demodulated and decode data frame. The wireless receiver correlates all of the likely data rates, by comparison to one another and to a relevant transmission protocol standard, to determine a maximum likelihood combination of data rates. The maximum likelihood combination of data rates includes a maximum likelihood data rate corresponding to each likely data rate. Decoded data frames are invalidated and erased when the likely data frame rates do not match corresponding maximum likelihood data rates.

In the method for selecting a channel rate, link quality between the serving portion of the network and a mobile station is determined from at least one signal strength measurement. A channel rate is then selected based on the determined link quality. Also, a physical channel is assigned to the mobile station on a prioritized basis with respect to the selected channel rate.

The invention provides a horizontal well cement paste, which comprises the following components in percentage by weight: 0.5%-2.5% of a flexibilizer GZR, 1%-3% of a GFC expansion agent, 0.04%-0.08% of a GH retarder and the balance of cement, zero free water and low-loss water, wherein the formed set cement does not shrink, and has a certain expansion rate and good mechanical property, and shows excellent tenacity. The set cement is high in breaking strength, and small in crumbly coefficient; the tenacity coefficient is increased; the young modulus of the set cement is decreased; the poisson ratio is increased; the bending radius of the set cement is reduced; a triaxial stress strain curve shows good elastoplasticity; the anti-channeling ability is improved; the thickening time is shortened; the time and the fluid channeling rate of a formation fluid intruding into the cement paste are reduced; the paste is uniform, stable and good in mobility; reduction of annular flow resistance is facilitated; and the displacement efficiency is improved.

The invention relates to a method for realizing the scheduling control of network encoding perceived by a transmission control protocol (TCP) in a wireless network, which comprises the following steps of: establishing a wireless network encoding model, a wireless channel model and a TCP model; assessing the channel quality of a wireless network system and the dynamic performance of the TCP; allocating a channel rate encoding mode in real time; encoding a group of TCP data packets selected from an intermediate node; and responding to a sender of the group of TCP data packets and forwarding the encoded data packets. By adopting the method for realizing the scheduling control of the network encoding perceived by the TCP in the wireless network, the change of channels can be known correctly, and an acknowledgement message is further sent to the sender of the data packets quickly and effectively, so network congestion is reduced, the transmission performance is improved, band width can be utilized effectively to allow the network to have higher throughput, the utilization rate of the band width is improved, wireless resources can be better utilized, the working performance is stable and reliable, and the application range is wide.

The invention discloses a switching method for semi-duplex and multicast collaborated relay mode and a corresponding base station, wherein the base station computes channel rate on three channel links according to channel quality information of three links of base station-relay station, relay station-mobile terminal and base station-mobile terminal, then computes effective channel rate on link of base station-relay station-mobile terminal under semi-duplex relay mode and multicast collaboration mode, executes mode switching judgment combining channel quality of base station-mobile terminal link and determined switching policy, switches between the semi-duplex relay mode and multicast collaborated relay mode. The corresponding base station comprises a first sending module, a second sending module and a relay mode control module. The invention can fully utilize relay system to reach the effect of improving network performance.

A power-reduced digital control within a feedback control loop of a sampling data detection channel controls a predetermined operating parameter of the channel in which an analog to digital converter provides digital samples of information in the channel at a predetermined channel clock rate. The digital control comprises a parameter error extraction circuit clocked at the predetermined channel rate which is connected to receive digital samples from the analog to digital converter, and which extracts parameter error values from the digital samples; an averaging circuit for averaging the extracted parameter error values over an integral submultiple of the predetermined channel clock rate; and a parameter error processing circuit which is connected to the parameter error extraction circuit and clocked at the integral submultiple of the predetermined channel rate for generating and putting out digital control values within the feedback control loop for controlling the predetermined operating parameter. The parameter may be timing, gain or DC offset, and the sampling data detection channel may be a PRML channel of a magnetic hard disk drive. A power-reduced control method is also described.

A method, device and computer-readable storage element for dynamically changing a maximum access channel rate at a site in a communication system. The method includes setting a maximum access channel rate for an access channel at a site, which comprises a coverage area for a base station. The method further includes determining a first access probe success rate that measures a rate at which first attempt access probes sent from the terminals on the access channel are received, and changing the maximum access channel rate based on the first access probe success rate.

A data demodulation process rate is varied according to a reproduction state, thereby reducing power consumption while maintaining a reading performance in a favorable state. A channel rate process data demodulation device performs a data demodulation process by employing channel bit frequency. Further, a half rate process data demodulation device performs a data demodulation process by employing frequency half as high as the channel bit frequency. These devices demodulate digital data from an optical recording medium. A process rate switching device switches a process rate at data demodulation, whereby demodulation is performed by switching between the data demodulation devices according to a quality of a reproduction signal, so as to reproduce the digital data recorded on the optical recording medium.