Abstract:
A synchronous/asynchronous frame relay system which efficiently supplies synchronization between multimedia devices is provided to minimize a delay time between a relay device and a jitter about a real time broadcasting type traffic. A terminal device(200) classifies a synchronization frame and an asynchronous frame. A relay device(300) relays the asynchronous frame received from the terminal device to the switch or the bridge mode. The relay equipment includes a relay unit of the physical layer and intermediary of the link layer. The synchronization frame and asynchronous frame include the synchronization frame or an ethertype item indicating the asynchronous frame.
Abstract:
PURPOSE: An Ethernet apparatus having a multi lane and a managing method using the same are provided to reduce power consumption by selectively and efficiently using multiple lanes comprising a broadband Ethernet apparatus according to a purpose. CONSTITUTION: A transmission rate controller(111) comprises a control unit(220), a sensor unit(210), and a transmission unit(230). The sensor unit transmits a detected signal to the control unit by detecting an activated lane and a deactivated lane. The control unit determines whether or not to insert a null word by receiving a sensing signal from the sensor unit. The control unit inserts the null word into a word by controlling the transmission unit. The control unit determines a position and the number for null word insertion corresponding to the number and position of a deactivated lane among the multiple lanes. The transmission unit receives the number of the activated lane from the control unit. [Reference numerals] (210) Sensor unit; (220) Control unit; (230) Transmission unit; (AA) Sensing signal; (BB) Word+null word; (CC) Word
Abstract:
Provided are a method and apparatus for controlling media access in a sensor network and a method of managing traffic information. Since traffic information is exchanged between nodes and data is transmitted by using a dynamic long preamble according to receiver nodes, data transmission efficiency can be improved, energy consumed to transmit the long preamble can be reduced, and data transmission delay can be reduced as well.
Abstract:
A media access control device of a medium access control method in a sensor network reducing delay generated between a hop and a sensor node are provided to process data quickly by using a check interval of short length. A first node performs an LPL(Low Power Listening) which is the check interval which is most short among the usable check interval(S510). A first node receiving the downward traffic information determines the check interval by summing the traffic volume which periodically reports to the sink node by summing upward traffic and downward traffic which receives from its own lower nodes(S525). The first node transmits the upward traffic binding update message by using the long preamble of the type '2 fitted to the check interval of the node having the most small traffic(S540).
Abstract:
Provided is a method of transmitting/receiving data in a sensor node for reducing overhearing of sensor nodes, and a sensor network which implements the method. A sender node having transmission data from among a plurality of nodes which perform a low power listening (LPL) operation in an asynchronous manner at predetermined time intervals, generates a long preamble including short preambles, each having information including a destination address of the transmission data, a remainder of the long preamble, and a length of the transmission data, and sequentially transmits the second preamble and the transmission data. A receiver node from among the plurality of nodes determines whether a valid signal is sensed during an active state in the LPL operation. If it is determined that the valid signal is sensed, the receiver node receives the short preamble transmitted from the sender node. The receiver node determines a duration time of a deactivated state of the receiver node based on the received first preamble, thereby reducing overhearing in the sensor network.
Abstract:
A method of transmitting/receiving data in a sensor network for reducing overhearing of sensor nodes is provided to minimize the power consumption of sensor nodes by minimizing the overhearing of the sensor nodes in a sensor network environment using an MAC(Media Access Control). A transmission node having transmission data generates a long preamble including at least short preamble for reducing the overhearing of other nodes(S510). The transmission node transmits the long preamble and the transmission data(S520). At least one first preamble includes the information as to the destination address of the transmission data, the residual amount of the second preamble at its time position and the length of the data to be transmitted.
Abstract:
PURPOSE: A method for emulating airborne data bus system over short-range broadcast and multicast networks and a system for carrying out the method are provided to improve the quality of work by supporting the rapid technical development on the conventional data bus system. CONSTITUTION: A terminal(110) implements the function as a separate apparatus. An analyzer(120) analyzes the frame by collecting frame on the data bus. A traffic generator(130) generates frame having load and error for the communication net. A remote setter(140) implements the remote controlling function for all the apparatuses on the bus.
Abstract:
PURPOSE: A short-range broadcasting communication system, a method for profile exchanging among short-range broadcasting communication nodes utilizing the communication system, and a short-range broadcasting communication node for carrying out the method are provided to build a shot-range broadcasting communication system with a situation recognition function. CONSTITUTION: A broadcast terminal device(110) stores and processes profile information. The broadcast terminal device processes a wireless and wired short-range communication. A profile preparation computer(120) writes the profile information about the broadcast terminal device. The profile preparation computer stores the profile information as described above within the corresponding broadcast terminal device. A web based internet server(130) supports the community generation and profile information preparation.