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上行重传分为自适应和非自适应两种，如果是下发UL Grant或NACK+UL Grant，那么是自适应重传，如果只下发NACK，则为非自适应重传。
对于DRX来说，是不是UE sleep时，只下发NACK触发非自适应重传；而在UE active时，下发UL Grant或者NACK+UL Grant触发自适应重传？
这个在协议文本里也有体现：
36.213
For FDD and normal HARQ operation, the UE shall upon detection of a PDCCH with DCI format 0 and/or a PHICH transmission in subframe n intended for the UE, adjust the corresponding PUSCH transmission in subframe n+4 according to the PDCCH and PHICH information. 注意其中的and/or
36.321

For each TTI, the HARQ entity shall:
- identify the HARQ process associated with this TTI;
- if an uplink grant has been indicated for this TTI:
。。。

- else:
- deliver the uplink grant and the HARQ information (redundancy version) to the identified HARQ process;
- instruct the identified HARQ process to generate an adaptive retransmission.
- else, if the HARQ buffer of the HARQ process corresponding to this TTI is not empty:
- instruct the identified HARQ process to generate a non-adaptive retransmission.