| 摘要 |
PROBLEM TO BE SOLVED: To avoid failures that data can not be transmitted to the other side devices due to a communication error even when data communication is operated by using a radio line by duplexing compressed and enciphered transmission data into a double structure, dividing the data into plural blocks, and continuously transmitting the data. SOLUTION: Data are inputted from a key panel 29 of a portable terminal equipment, received by a sub-CPU 28, compressed by a data compressing part 46, enciphered by a scramble processing part 47, and converted into data transmittable transmission data. In the case of PHS, data are transmitted by radio, and burst error is easily generated. Then, the enciphered transmission data are turned into a double structure by a data duplexing part 48. That is, when data prepared by the data input of the key panel 29 are N byte variable data, the data are shortened by the data compressing part 46, and the data are turned into the double structure so that communication data in which the same telegraphic messages are made double can be obtained. The data are divided into (n) pieces of blocks by a data dividing part 49, and transmitted as packets. |
