ACK/NACK scheduling method and scheduling device for LTE-TDD system
A scheduling method and technology of a scheduler, applied in the LTE field of mobile communication, can solve the problem that one-to-one correspondence between uplink and downlink cannot be established.
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[0036] The present invention proposes an ACK / NACK feedback scheme aiming at the characteristics of the TDD system, especially when there are more downlink subframes than uplink subframes, to ensure effective transmission of ACK / NACK signaling and uplink single-carrier characteristics. The so-called single-carrier characteristic here can be understood as: the channel for transmitting ACK / NACK is continuous in the frequency domain, and uses the same ZC (Zadoff-Chu) sequence.
[0037] As introduced above, for the TDD system, due to the asymmetric characteristics of the uplink and downlink, it cannot always establish a one-to-one correspondence like the FDD system. see Figure 4 , when the downlink subframe is less than or equal to the uplink subframe, the mapping relationship between the transmission ACK / NACK and the service subframe can be determined by agreement. see Figure 5 , when there are more downlink subframes than uplink subframes, it means that one uplink time slot n...
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