| 摘要 |
PROBLEM TO BE SOLVED: To enhance a negative acknowledgement (NAK) signal reception rate by allowing a slave station receiving broadcasting communication data including an error to send a NAK signal in a permitted time and allowing a base station to monitor the NAK signal within a reception expect time only. SOLUTION: It is negotiated in advance between a base station and all slave stations that all the slave stations do not send signals other than a NAK signal for a prescribed time after the base station sends broadcasting communication data to the slave stations. The transmitted broadcasting communication data are received by a plurality of slave stations around the base station and a slave station that detects an error in received data sends a burst NAK signal within a permitted time. Even when the base station detects a NAK signal code within a limited time or cannot detect the NAK code due to a transmission error in excess of the error correction capability, the base station regards it as the arrival of the NAK signal when a radio carrier is received. An output after demodulation and error correction and a reception electric field strength signal from a radio section 2 are applied to a NAK signal detection section 3 for this purpose. |
