Patent ID: 6266360
Filing Date: 2001-07-24
Classification: H04L

Abstract:
A direct-spread-spectrum communication system, comprising:apparatus transmitting and receiving signals spread by using a spread-code and being multiplexed according to a data format including a simplex portion and a multiplexed portion or only a multiplexed portion or only a simplex portion and, including multiplexing means for multiplexing said signals so as to have a delay time of a predetermined number of chips of the spread-code, the spread signals being transmitted and received packetized in data packets and transmitted by an ARQ (Automatic Repeat Request) method, and wherein an ACK (Acknowledge) signal and a NAK (Negative Acknowledge) signal for acknowledging the receipt of correctly or incorrectly transmitted signals are transmitted and received only as simplex spread-spectrum signals; and,wherein the number of multiplexed data in the data packets is controlled and decreased when a result of counts of received NAK signals indicating incorrect receipt of transmissions includes no response or incorrectly received response reaches a specified preset value, or a predetermined ratio of an ACK to NAK signal count exists and wherein the decreased number of data packets is then re-transmitted and received in a simplex state.