Electronics and Telecommunications Research Institute

Konkuk University Industrial Cooperation Corp

Sangjae Lee

Sangsung Choi

Young Ae Jeon

Cheol-Ho Shin

Mi Kyung Oh

Byoung Hak Kim

Seung Sik Lee

Jae Young Kim

Kwang Roh Park

Kang-yoon Lee

Jaehwan Kim

Joon-Sung Park

YoungGun Pu

A method of generating a packet for low energy critical infrastructure monitoring (LECIM) wireless communication is provided. The method includes steps of generating a first bit string by multiplexing a physical layer header (PHR) bit and a physical layer service data unit (PSDU) bit; convolution encoding the first bit string; interleaving the convolution-encoded first bit string; generating a second bit string by multiplexing the interleaved first bit string with a synchronization header (SHR) bit; and modulating the second bit string with a frequency shift keying (FSK) method and a position-based FSK method.

Method of generating and receiving packets in low energy critical infrastructure monitoring system

A method of generating networks by utilizing a multi-channel so that channels may be efficiently used, inter-channel interference may be avoided, and a network may be energy efficiently managed is provided. Through a super personal area network (PAN) coordinator that manages all networks based on a multi-channel, a PAN capable of avoiding inter-channel interference may be formed. In addition, it is possible to grasp use states of channels used for transmitting and receiving beacon frames, to observe a change in a network topology, and to form an energy efficient PAN.

Method of generating networks by utilizing multi-channel

A digital phase-locked loop apparatus using FSK includes a PFD detecting phase differences between a reference clock and a frequency-divided signal, and a first adder for generating first digital control codes by adding first digital codes, second digital codes, and channel frequency codes including channel information to each other, the first digital codes being converted from time differences between first and second pulses. The apparatus further includes a digital filter correcting errors of the first digital control codes to generate second digital control codes, a DCO for varying an oscillating frequency in accordance with a digital tuning word based on the second digital control codes, and a dual modulus division unit dividing the oscillating frequency into a frequency-divided signal.

Digital phase-locked loop apparatus using frequency shift keying and method of controlling the same

A method for allocating distributed Medium Access Control (MAC) resources in a Wireless Personal Area Network (WPAN) includes calculating an acknowledgement overhead; calculating a Medium Access Slot (MAS) overhead depending on a payload length of a frame; calculating a transfer rate; calculating a number of frame bits to be transmitted; and calculating a first number of MASs. Thereby, the method optimized a final number of MASs required per superframe. Further, a distributed MAC resource allocation apparatus includes a MAC client for determining a resource allocation scheme and an amount of resources, and for sending a request to a MAC resource management unit; a MAC physical layer for providing a received power level or the like to the MAC resource management unit; and the MAC resource management unit for determining a payload length or the like and for allocating wireless resources to devices connected to the WPAN.

Resource allocation method and apparatus in distributed MAC for wireless personal area networks

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Daejeon, South Korea

Sangjae Lee