Electronics and Telecommunications Research Institute

Yunjoo Kim

YongWook Ra

Sok-Kyu Lee

Hyungu Park

Yoo-Seung Song

Jee-Yon Choi

Kyounghee Song

A photonic frame switching system may include a main controller and at least one photonic frame wrapper line card. The main controller may determine a point in time at which a photonic frame wrapper line card transmits a photonic frame by allocating a time slot to the photonic frame wrapper line card. When the photonic frame switching system includes a plurality of photonic frame wrapper line cards, points in times at which the plurality of photonic frame wrapper line cards transmits the photonic frames may be synchronized. In particular, when a portion of the plurality of photonic frame wrapper line cards transmit a plurality of photonic frames having different destinations, points in times at which all of the plurality of photonic frame wrapper line cards transmits the photonic frames may be adjusted based on a latency by a destination change.

Photonic frame switching system determining moment of transmitting photonic frame based on time used for changing wavelength of tunable laser diode

A photonic frame switching method and system. The photonic frame switching method includes resetting, by a second input module receiving a master notification, a second timeslot counter used in the second input module to be synchronized with a first timeslot counter used in a first input module, and transmitting a photonic frame from each of a plurality of input modules to a photonic switch fabric device according to a timeslot allocated to each of the input modules based on a scheduling acknowledgement signal transmitted from a main controller, based on the synchronized first and second timeslot counters.

Method and system for switching photonic frame

Provided are an apparatus and method for processing an ARQ in a MIMO system. The apparatus includes a storing unit for storing reordering thresholds of each receiving terminal and retransmission data; a priority managing unit for assigning a priority to a plurality of antenna groups in ascending order of a bit error rate of a wireless channel of each antenna group and managing the plurality of antenna groups based on the priorities; a data transmitting unit for transmitting retransmission data; and a controlling unit for controlling the data transmitting unit to transmit retransmission data within a range not exceeding a reordering threshold of a corresponding receiving terminal sequentially using an antenna group having the highest priority first.

Growing community of inventors

Seongman-si, South Korea

Yunjoo Kim