| http://www.w3.org/ns/prov#value | - An ACK signal is a signal to indicate that a high speed packet transmitted from a base station apparatus on the HS-PDSCH is decoded correctly by a communication terminal apparatus, and a NACK signal is a signal to indicate that a high speed packet transmitted from a base station apparatus on the HS-PDSCH is erroneously demodulated by a communication terminal apparatus.
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