FIELD: information technologies.
SUBSTANCE: procedures are described to improve reliability of service signals transfer. A transmitter determines whether improved reliability is applicable for service signals for a data frame. The transmitter sends service signals without improved reliability, if it is considered to be inapplicable, and with improved reliability, if it is considered applicable. A receiver receives service signals and announces service signals as reliable or unreliable on the basis of quality of a received signal of a received frame and a threshold. The receiver restores service signals, if they are considered reliable, and decodes a received frame in compliance with restored service signals. The receiver announces the received frame as a zero frame or performs another action, if the service signal is considered to be unreliable.
EFFECT: achievement of reliable transfer of service signals.
37 cl, 13 dwg
