71 results about "Asymmetric communication" patented technology

The present invention relates to a communication system comprising a plurality of terminals each having an uplink transmission unit (1) for transmitting radio frequency OFDM signals at a radio frequency and an access point having an uplink receiving unit (4) for concurrently receiving said radio frequency OFDM signals from at least two terminals, said OFDM signals being Orthogonal Frequency Division Multiplex (OFDM) modulated, wherein the bandwidth of said uplink transmission units and of the transmitted radio frequency OFDM signals is smaller than the bandwidth of said uplink receiving unit, that the bandwidth of at least two uplink transmission units and of their transmitted radio frequency OFDM signals is different and that the uplink transmission unit is adapted to assign different connections for concurrently transmitting radio frequency OFDM signals to different sub-carriers in the same time slots or to the same or different sub-carriers in different time slots.

A link, called an X-Link™ and is placed in a message (SMS, MMS, email etc.) that is sent to a user and displayed on their device (e.g. mobile telephone). When the link is selected by the user, it connects the user's device to a conversion system, enabling the user to speak a reply which is then converted to a text based reply message; the reply message is then sent to the original message sender (and / or another appropriate recipient). This approach enables a text message to be responded to by voice: it is an example of an asymmetric communication. There are many circumstances where this approach is very useful—for example if the message is a SMS and the recipient does not know how to respond using SMS, or is in an environment where it is difficult (perhaps when walking or driving).

A portable communication device (PCD) can automatically switch into different operating modes of an asymmetric communication protocol (such as USB) depending on the type of accessory connected. For example, the accessory can signal whether the PCD should operate in a first mode or a second mode using a hardware indicator such as identification resistor across two pins of a multi-pin connector and / or a software indicator such as a command protocol. The PCD can detect the accessory's signal and switch to the operating mode requested by the accessory.

The present invention relates to a communication system comprising a plurality of terminals each having an uplink transmission unit (1) for transmitting radio frequency OFDM signals at a radio frequency and an access point having an uplink receiving unit (4) for concurrently receiving said radio frequency OFDM signals from at least two terminals, said OFDM signals being Orthogonal Frequency Division Multiplex (OFDM) modulated, wherein the bandwidth of said uplink transmission units and of the transmitted radio frequency OFDM signals is smaller than the bandwidth of said uplink receiving unit and that the bandwidth of at least two uplink transmission units and of their transmitted radio frequency OFDM signals is different. The present invention relates further to a communication system wherein the access point has a downlink transmission unit (7) for transmitting radio frequency OFDM signals at a radio frequency and that the at least two terminals each have a downlink receiving unit (11) for receiving said radio frequency OFDM signals, wherein the bandwidth of said downlink transmission unit is larger than the bandwidth of said downlink receiving units and that the downlink transmission unit is adapted to generate and transmit radio frequency OFDM signals having a bandwidth that is smaller than or equal to the bandwidth of the downlink transmission unit and that is equal to the bandwidth of the downlink receiving unit by which the radio frequency OFDM signals shall be received. Still further, the present invention relates to a communication method, to a terminal and to an access point for use in such a communication system.

A link, called an X-Link™ and is placed in a message (SMS, MMS, email etc.) that is sent to a user and displayed on their device (e.g. mobile telephone). When the link is selected by the user, it connects the user's device to a conversion system, enabling the user to speak a reply which is then converted to a text based reply message; the reply message is then sent to the original message sender (and / or another appropriate recipient). This approach enables a text message to be responded to by voice: it is an example of an asymmetric communication. There are many circumstances where this approach is very useful—for example if the message is a SMS and the recipient does not know how to respond using SMS, or is in an environment where it is difficult (perhaps when walking or driving).

A system for efficiently and reliably communicating over a high-speed asymmetric communications link. The system includes a first mechanism for connecting a first device to a second device via a channel. A second mechanism delivers data packets over the channel from the first device to the second device. Each packet is associated with a window of packets. A third mechanism selectively employs the second mechanism to re-send data packets not received by the second device after each window of packets. The window of packets is sized in accordance with the bandwidth of the communications link between the first device and the second device, and the round trip delay time. In a specific embodiment, the first mechanism (includes Transmission Control Protocol / Internet Protocol (TCP / IP) functionality on the first device and the second device for establishing a first TCP / IP link from the second device to the first device. The first mechanism also includes Universal Datagram Protocol (UDP) functionality on the first device and the second device for transferring UDP packets from the first device to the second device. The third mechanism sends acknowledgement messages from the second device to the first device specifying the packets not received by the second device. The system further includes a fourth mechanism for selectively disabling the second mechanism when first device does not receive an acknowledgement message after a predetermined time interval. The predetermined time interval is a function of a window timeout variable. The predetermined function is (M)x(window timeout), where M is approximately 2. The window timeout is greater than N multiplied by a number of packets included in the window of packets divided by the data rate of the communications link between the first device and the second device, here N is an integer greater than 1. N is between 3 and 10.

An asymmetric bandwidth communication system enables wireless communication between interrogators / readers and transponders / tags. A transponder transmits TDCIR (Time Domain Carrierless Impulse Radio) signals in the uplink direction and receives non-TDCIR signals, such as electromagnetic continuous waves, in the downlink direction. The transponder may receive partial or whole power from non-TDCIR signals. The TDCIR utilizes electromagnetic impulses with short duration and ultra wide bandwidth. It offers high data rate reliable communication at low power and design complexity. It also demonstrates resilience against path fading, selective absorption and reflection by physical matters and excellent location determination capabilities.

A method and apparatus to overcome fundamental shortcomings in narrow band as well as wide band RFID solutions through offering a hybrid solution that utilizes benefits of narrow band in the downlink direction with the benefits of ultra wide band in the uplink. The invention encompasses a multitude of methods, including an approach to increase the ability to capture electromagnetic energy from the reader.

In a peer-to-peer asymmetric communication environment, an adaptive upload Data Rate Control element—called Adaptive-DRC—is used to detect increase in data return-trip time (RTT) caused by the congestion associated with the uploading of data in an uplink which in turn impacts on downloading data on an associated downlink, namely a downlink sharing resources with the uplink. Using Adaptive-DRC, the congestion is detected and thereupon adjustments to are made to allow continued communication. Adaptive-DRC comprises: (i) RTT estimation; (ii) detection of the onset of congestion, herein pre-congestion detection; and (iii) adaptation of the upload data rate limit. Two specific embodiments are contemplated, namely two versions of Adaptive-DRC wherein the difference lies in the upload data rate limit adaptation technique.

This invention relates to a method and an apparatus for processing digital audio signals that may reduce the signal degradation occurring when the signal is exchanged between two communication terminals equipped with vocoders in a communication network. The solution proposed by this invention is to provide a communication terminal with a vocoder including a decoder section provided with a plurality of decoding units. A switch activates a selected one of the decoding units in dependence of the format of the compressed audio signal data frames received from a remote communication terminal. This system allows the communication terminal to support a number of different speech compression formals. In order to achieve simplicity and low cost, the communication terminal is provided with a single encoding unit. This results in an asymmetric arrangement where the communication terminal has a large number of decoding units than encoding units. The great majority of the speech compression algorithms deployed in wireless and Internet telephony standards have the property that their speech decoders are of far less computational complexity than their respective speech encoder. Therefore, a low-cost terminal can be produced which supports a low complexity speech encoder unit and a variety of speech decoder units.

A relay node (or relay station) assists in providing asymmetric communications with a mobile station. When resources are less than ideal for providing a direct uplink or downlink with the mobile station to a first base station, the relay station is employed to provide an uplink or downlink to a second base station. The mobile station may still maintain a direct downlink / uplink to the first base station when adequate resources are present. To assist in resource coordination the first and second base stations share scheduling information for the mobile station. This approach allows a second base station to server as a surrogate base station for a first base station, when inadequate resources are available for a direct uplink or downlink to the mobile station. The relay node makes it possible for the mobile station to maintain the uplink (or downlink) with the second base station, while remaining assigned to the first base station.

A method and system for canceling echo signals originating from a transmitter at a predetermined data rate. The echo signals are received by a receiver at a different data rate. The echo system is configured to manipulate data rates of transmitted signals, and reconstruct echo signals for consideration by the receiver. In view of the band-limited nature of these echo signals, the invention intelligently reduces the computational complexity of reconstructing and canceling echo signals.

A railway vital or critical application system substitutes commercial off-the-shelf (COTS) hardware and / or software for railway-domain specific product components, yet is validated to conform with railway vital system failure-free standards. The vital system uses a pair of COTS personal computers and operating systems with asymmetric communications capability. Each computer and operating system may differ for additional redundancy. Both computers receive and verify vital systems input message data and security code integrity and separately generate output data responsive to the input message. The first computer has sole capability to send vital system output messages including the output data and an output security code, but only the second computer has the capability of generating the output security code. A failure of either computer's hardware, software or processing capability results failure to transmit a vital system output message or an output message that cannot be verified by other vital systems.

A railway vital or critical application system substitutes commercial off-the-shelf (COTS) hardware and / or software for railway-domain specific product components, yet is validated to conform with railway vital system failure-free standards. The vital system uses a pair of COTS personal computers and operating systems with asymmetric communications capability. Each computer and operating system may differ for additional redundancy. Both computers receive and verify vital systems input message data and security code integrity and separately generate output data responsive to the input message. The first computer has sole capability to send vital system output messages including the output data and an output security code, but only the second computer has the capability of generating the output security code. A failure of either computer's hardware, software or processing capability results failure to transmit a vital system output message or an output message that cannot be verified by other vital systems.

An asymmetric composite cable shield for use in communications cable that includes a protective layer clad with inner and outer layers of copper or a copper alloy, in which the inner layer is thicker than the outer layer.

The invention provides an asymmetric flexible communication transceiver and a communication system. According to the transceiver, a flexible communication control unit outputs uplink and downlink transmitting / receiving control information which independently changes to a flexible frequency synthesis unit to generate a transmitting / receiving reference signal according to asymmetric communication requirements; during transmitting, a flexible transmitting unit processes a baseband transmitting signal into a digital transmitting signal based on the transmitting reference signal and according to the transmitting control information and transmits a radio frequency signal through tunable up-conversion and power amplification by a variable duplexer; and during receiving, the variable duplexer receives the radio frequency signal, transmits a radio frequency receiving signal to the baseband through tunable down-conversion based on the receiving reference signal, generates a digital receiving signal and extracts a corresponding baseband receiving signal from the digital receiving signal according to the receiving control information. The communication system comprises a base station with the transceiver and a terminal with the transceiver.

A railway safety critical application system substitutes commercial off-the-shelf (COTS) hardware and / or software for railway-domain specific product components, yet is validated to conform to railway safety critical system failure-free standards. The safety critical system uses a pair of tasks executed on a controller of a COTS personal computer or within a virtual environment with asymmetric communications capability. Both tasks receive and verify safety critical systems input message data and security code integrity and separately generate output data responsive to the input message. The first task has sole capability to send complete safety critical system output messages, but only the second task has the capability of generating the output security code. A failure of any of systems hardware, software or processing capability results failure to transmit a safety critical system output message or an output message that cannot be verified by other safety critical systems.

A method and an arrangement are disclosed for implementing fast signalling in a communication connection between a base station and a mobile station of a cellular radio network. There is defined an arrangement of repeatedly occurring frames that consist of pieces of allocatable radio communication capacity between the base station and mobile stations communicating therewith. Pieces of radio communication capacity are allocated from the arrangement of repeatedly occurring frames to dedicated communication channels. A certain piece of radio communication capacity is allocated from the arrangement of repeatedly occurring frames to a non-dedicated fast signalling channel between the mobile stations and the base station. This piece of radio communication capacity allocated to a non-dedicated fast signalling channel is used for conveying fast signalling messages between at least one mobile station and the base station.

The invention relates to the technical field of information, in particular to a computing task unloading algorithm based on cost optimization, which mainly comprises the following steps: 1) constructing a new edge cloud computing model; Wherein the new side cloud computing model comprises three important computing costs: the execution cost of a computing task, the communication cost between computing tasks at the same end and the asymmetric communication cost between computing tasks at different ends; (2) expanding a new model of edge cloud computing, (3) merging computing cost, and (4) solving an optimized unloading strategy based on a greedy criterion, and solves the problem of unloading optimization of a computing task in a combined framework of edge computing and cloud computing.

Methods and systems for facilitating communications and commerce between remote device users and merchants or sponsors, particularly adapted for small-screen portable devices such as cellular telephones and personal digital assistants. The invention enables sponsors to quickly and easily, without the requirement for specialized or expensive equipment, establish Web sites to advertise their products and services. The invention provides unique, intuitive graphical interfaces enabling users to find Web sites of interest easily and quickly amongst many sites. In addition to real-time, direct sponsor-user communications, the system further includes features such as response time prioritization, which enable users to quickly determine the relevance of a sponsor response.

System for transmitting asymmetric data in a radiocommunications system comprising a cell, in which a group of remote units is located, said cell being divided into at least two sectors.A first fixed unit (11-1) and a second fixed unit (11-2) provide radio coverage for a first subset of remote units located within the first sector and a second subset of remote units located within said second sector, respectively. Both fixed units (11-1 and 11-2) are located at the same site.Controller means (13) connected to both fixed units (11-1 and 11-2), record the radio channel and the sector in which an asymmetric communication is set up in the downlink direction of the transmission.

The invention discloses a parallel drawing method based on multi-level asymmetric communication management. The method comprises the steps that S1, numerical simulation result data are read in in parallel; s2, the client interaction process starts to draw; s3, executing parallel drawing by the server drawing process; and S4, the server draws a result and transmits the result to the client. According to the method, the inter-process communication frequency in the parallel visual calculation and drawing process is reduced, the inter-process load balance is realized, the data loading efficiency is improved, and the drawing efficiency is improved.

The invention relates to an apparatus and method for maintaining reliability of a wireless network having asymmetric or other low quality wireless links. The method includes receiving (702-704) link quality information associated with multiple wireless connections in a wireless network. The method also includes identifying (706) at least one asymmetric communication path in the wireless network using the link quality information. The link quality information could include a statistical value for each of the wireless connections. Identifying the at least one asymmetric communication path could include identifying a first and a second of the statistical values associated with a first and a second of the wireless connections, respectively, and determining whether a difference between the first and second statistical values exceeds a threshold. The method could further include applying (708) a heuristic to indicate that the first and second wireless connections do not form an asymmetric communication path even if the difference between the first and second statistical values exceeds the threshold.

A system for controlling transmission of data over a network. In response to receiving a content request from a client device coupled to the network, an initial data packet is sent to the client device. In response to receiving a feedback packet from the client device, transmission of the content request is dynamically adjusted.

The invention discloses an asymmetric communication network and method. The asymmetric communication network comprises a blank television frequency band base station and a second base station different from the blank television frequency band base station, wherein the blank television frequency band base station is used for transmitting communication data to a mobile terminal to implement downlink transmission; the mobile terminal is used for directly transmitting the communication data to the second base station to implement uplink transmission; the second base station is used for transmitting the communication data to the blank television frequency band base station by virtue of a network. According to the asymmetric communication network, the downlink chain transmission is implemented by the blank television frequency band base station; the uplink chain transmission is implanted by the second base station different from the blank television frequency band base station; a high-speed blank television frequency band base station transmission channel of an existing resource is fully used; the data transmission is implemented between the uplink chain and the downlink chain by virtue of different communication paths; the broadband transmission speed is increased.