Nec Corporation

Piaa Corporation

Hideaki Shimada

Gen Kani

Yukari Ishiwatari

Surface configuration of a lamp for vehicle

A multidirectional time-division multiplexing wireless data communications system can prevent erroneous data from being transmitted through a data communication line even when a bit error has occurred in transmission data. An error correcting redundant bit, obtained by performing an error correcting code operation on a low-speed continuous signal, is multiplexed to a specific vacant slot in a wireless frame. A burst signal, converted by a continuous/burst signal conversion circuit through an interleaving operation, is multiplexed to a predetermined time slot, and transmitted to a wireless area. The burst signal is received by the conversion circuit, and converted into a continuous signal through a de-interleaving operation. A division circuit divides an error correcting code to generate a syndrome. Based on the syndrome, an error position detection circuit specifies bit error position in data, and an addition circuit corrects errors.

Multidirectional time-division multiplexing wireless data communications system

The object of the present invention is to provide a time division multiple access radio data communication method wherein a radio time slot can be utilized effectively. In order to carry out data communication between data terminal equipment 1a connected to base station equipment 1 and a plurality of predetermined data terminal equipment 10a, 11a, 12a connected to those out station equipment 10, 11, 12 which face base station equipment 1, common radio time slot TS0 is allocated fixedly, and the plurality of predetermined data terminal equipment 10a, 11a, 12a send out request to send signals a0, a1, a2 at timings which do not overlap with each other. Then, out station equipment 10, 11, 12 which receive request to send signals a0, a1, a2 sent out from data terminal equipment 10a, 11a, 12a send back, when they are ready to send out data signals to base station equipment 1 using common radio time slot TS0 allocated thereto, clear to send signals b0, b1, b2 to data terminal equipment 10a, 11a, 12a which have sent out request to send signals a0, a1, a2, whereafter data terminal equipment 10a, 11a, 12a which receive clear to send signals b0, b1, b2 sent back from out station equipment 10, 11, 12 send out data signals to out station equipment 10, 11, 12.

Time division multiple access radio data communication method

In a subscriber interface control method, a plurality of subscriber interface sections set with different unique accommodation location numbers corresponding to accommodation locations thereof and a subscriber interface control section connected to the subscriber interface sections via a control/monitor signal line to control the subscriber interface sections and monitor operation states thereof. Management number sections in which different management numbers are set are arranged in the subscriber interface sections. The subscriber interface control section controls the subscriber interface sections and monitors the operation states thereof by sending the management numbers to the control/monitor signal line.

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Tokyo, Japan

Hideaki Shimada