Question: In a HSDPA scenario with dual cells (Cell 1 and Cell 2), where the SS responds with E-HICH = NACK on Cell 1 and E-HICH = ACK on Cell 2, what indicates to the UE that an ACK was received from any cell when transmitting new data or retransmissions on E-DPCCH and E-DPDCH?
Option 1: New data transmission on E-DPCCH and E-DPDCH always signifies a NACK reception.
Option 2: Retransmission on E-DPCCH and E-DPDCH is a sign for ACK received by the UE from any of the cells.
Option 3: New data transmission on E-DPCCH and E-DPDCH signifies an ACK, while retransmission indicates a NACK was received on both cells.
Option 4: Both new data and retransmissions on E-DPCCH and E-DPDCH always signify a NACK reception from Cell 1.
Explanation: According to the measurement principle for the missed ACK test and false ACK test, when the UE transmits new data on E-DPCCH and E-DPDCH, it signifies that an ACK was received by the UE from any of the cells. Conversely, a retransmission indicates that a NACK was received by the UE on both cells. This distinction is crucial for accurately counting missed or false ACKs in the test scenarios.