Abstract: 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.

Abstract: Disclosed herein is a multi-hop communication method based on distributed medium access control. In the multi-hop communication method based on distributed medium access control according to the present invention, a beacon frame which includes a first multi-hop information element is generated and transmitted to a neighboring device so as to search for a route to an external device which does not belong to a beacon group. A third multi-hop information element, which is generated based on a second multi-hop information element generated by the external device, is received from the neighboring device. A multi-hop route to the external device is set up in accordance with the third multi-hop information element, and data is transmitted to the external device. Therefore, a multi-hop route between devices in the extended beacon group can be efficiently set up.

Abstract: In a local wireless communication system, a reception signal including an STF (short training field) in which a plurality of patterns are repeatedly transmitted is received, the STF including a first number of STF patterns and a second number of STF patterns, the second number of STF patterns having an opposite code to that of the first number of STF patterns. In a first frequency offset estimation and correction process and a second frequency offset estimation and correction process, frequency offset estimation is performed on a plurality of STF patterns to acquire a phase error of each sample constituting the STF patterns, and the frequency of the STF patterns is corrected based on the acquired phase error. Cross correlation is performed on a predetermined number of STF patterns, among a plurality of STF patterns output subsequent to the frequency offset estimation and correction, to detect frame timing.

Abstract: 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.

Abstract: 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.

Abstract: In the environment of a wireless personal area network (WPAN) with a plurality of piconets, to allow a tree-based routing service and an optimized routing service through repeatedly building parent-child piconets, an inter-piconet mesh communication device and method for providing a multi-hop communication function among a plurality of piconets is provided by defining a mesh sublayer between a frame convergence sublayer and a MAC sublayer and providing a mesh data service to the frame convergence sublayer through a mesh service access point, defining a mesh sublayer management entity between a device management entity and a MAC sublayer management entity and providing a mesh management service to a device management entity through a mesh sublayer management entity service access point.

Abstract: Provided are a routing table generating method, a data transmission method, and a routing route formation method for multi-hop communication in high rate wireless personal networks. In a high rate WPAN environment including a plurality of piconets, a piconet controller (PNC), which performs a topology server function to provide the optimal route, collects link state information from the PNCs or DEVs (devices) belonging to a sub-tree that serves as a root and applies a minimum cost algorithm based on the collected link state information to calculate the optimal route for all pairs of originations and destinations existing within the sub-tree in consideration of QoS. The optimal route information is transmitted to the origination PNC via the destination PNC/DEV. During performing this, the optimal route between the pairs of originations and destinations is set.

Abstract: A base station and a terminal for supporting a low power mode are provided. The base station transmits a first type of beacon signal for a terminal operating in a normal mode, a second type of beacon signal for a terminal operating in a low power mode, and a charging signal for a terminal in a low power mode. The terminal harvests energy from a charging signal and receives the second type of beacon signal using the harvested energy. The terminal confirms a communication request through the second type of beacon signal, enters into an active period, and communicates with the base station.

Abstract: A method for operating a device in a personal area network (PAN), includes: obtaining physical layer information regarding a physical layer; scanning a channel on the basis of the physical layer information; selecting a channel on the basis of channel information obtained through the channel scanning process; determining whether or not there is a PAN coordinator with respect to the selected channel; and when a PAN coordinator does not exist in the selected channel, transmitting a beacon signal including information regarding a superframe structure, wherein the superframe structure includes at least one sub-superframe, and the information regarding the superframe structure includes information regarding the number of beacon slots for transmitting a beacon signal in each sub-superframe, the number of data slots for transmitting data in each sub-superframe, and the number of sub-superframes.

Abstract: A routing method from a source device to a destination device is provided in a device within an extended beacon group. The device receives a first route request beacon from the source device or via at least one first neighbor device from the source device in accordance with a table-driven type. The device transmits a second route request beacon to the destination device or via at least one second neighbor device to the destination device in accordance with an on-demand type.

Abstract: 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.

Abstract: Provided is an optimum resource allocation method in distributed medium access control in a wireless personal area network, including: defining needed parameters in advance; calculating an overhead AckOverhead needed for an acknowledgement policy and calculating an overhead MasOverhead generated per medium access slot by using the calculated overhead AckOverhead and an amount of the medium access slots which remain after transmitting a frame; calculating the number of frame bits to be transmitted per superframe; determining the number of medium access slots primarily needed per the superframe by using the calculated number of frame bits and the calculated overhead MasOverhead generated per the medium access slot; and optimizing the number of medium access slots finally needed per the superframe.

Abstract: Disclosed herein is a multi-hop communication method based on distributed medium access control. In the multi-hop communication method based on distributed medium access control according to the present invention, a beacon frame which includes a first multi-hop information element is generated and transmitted to a neighboring device so as to search for a route to an external device which does not belong to a beacon group. A third multi-hop information element, which is generated based on a second multi-hop information element generated by the external device, is received from the neighboring device. A multi-hop route to the external device is set up in accordance with the third multi-hop information element, and data is transmitted to the external device. Therefore, a multi-hop route between devices in the extended beacon group can be efficiently set up.

Abstract: Provided are a routing table generating method, a data transmission method, and a routing route formation method for multi-hop communication in high rate wireless personal networks. In a high rate WPAN environment including a plurality of piconets, a piconet controller (PNC), which performs a topology server function to provide the optimal route, collects link state information from the PNCs or DEVs (devices) belonging to a sub-tree that serves as a root and applies a minimum cost algorithm based on the collected link state information to calculate the optimal route for all pairs of originations and destinations existing within the sub-tree in consideration of QoS. The optimal route information is transmitted to the origination PNC via the destination PNC/DEV. During performing this, the optimal route between the pairs of originations and destinations is set.

Abstract: In the environment of a wireless personal area network (WPAN) with a plurality of piconets, to allow a tree-based routing service and an optimized routing service through repeatedly building parent-child piconets, an inter-piconet mesh communication device and method for providing a multi-hop communication function among a plurality of piconets is provided by defining a mesh sublayer between a frame convergence sublayer and a MAC sublayer and providing a mesh data service to the frame convergence sublayer through a mesh service access point, defining a mesh sublayer management entity between a device management entity and a MAC sublayer management entity and providing a mesh management service to a device management entity through a mesh sublayer management entity service access point.

Abstract: 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.

Abstract: Provided are a system and a method for allocating wireless resources in a WPAN. The system includes an MAC layer. The MAC layer divides a superframe into a predetermined number of groups, estimates the number of MASs requested by the MAC client and the number of required consecutive MASs, and allows the consecutive MASs to be distributed and allocated for each divided group. With this structure, adjacent clients can use a common MAS and thus a minimum resource is allocated to the adjacent clients in a WPAN.

Abstract: Provided is an optimum resource allocation method in distributed medium access control in a wireless personal area network, including: defining needed parameters in advance; calculating an overhead AckOverhead needed for an acknowledgement policy and calculating an overhead MasOverhead generated per medium access slot by using the calculated overhead AckOverhead and an amount of the medium access slots which remain after transmitting a frame; calculating the number of frame bits to be transmitted per superframe; determining the number of medium access slots primarily needed per the superframe by using the calculated number of frame bits and the calculated overhead MasOverhead generated per the medium access slot; and optimizing the number of medium access slots finally needed per the superframe.

Abstract: Provided are an apparatus and method for managing a Medium Access Slot (MAS) in a Wireless Personal Area Network (WPAN). The apparatus includes a transmission data storage unit for storing a transmission beacon and transmission data; a transmission controller for reading and transferring the transmission beacon to a transmission beacon control signal, and reading the transmission data and transferring it at a corresponding MAS; a transmission beacon parser for parsing the transmission beacon; an MAS allocation unit for comparing the reservation information with queue allocation information of an allocation queue list to allocate MAS; and a superframe controller for generating the transmission beacon control signal, and generating the data transmission/reception control signal at the start time of the MAS allocated by the MAS allocation unit.

Abstract: Disclosed is an apparatus for transmitting WPAN (Wireless Personal Area Network) MAC (Medium Access Control) frames and method thereof. The apparatus includes a transport frame management unit for creating MAC transport frames if data is generated from an upper protocol and application layer unit, classifying the created MAC transport frames by kinds, and managing the classified MAC transport frames by queues, a transport memory control unit for transmitting the transport frames at a high speed, and a transport frame transmission unit for responsible for the transmission of the transport frames by judging the transmission time of the frames. The apparatus can efficiently support the IEEE 802.15.3 standard by designing a queue structure capable of managing the WPAN MAC frames according to user's priority information and traffic characteristics in a WPAN device for supporting video/audio streams.