Downlink Scheduling

zero2100

于 2024-02-04 21:01:37 发布

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本文链接：https://blog.youkuaiyun.com/zero2100/article/details/136032183

本文详细描述了下行链路调度过程，包括网络发送PDSCH调度指示（DCI）、PDSCH传输后的K0时隙（通常K0=0）以及用户在传输后通过UCI（可能通过PUCCH或PUSCH）发送ACK/NACK的机制。文中还展示了不同情况下的UCI承载时间槽的例子。

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Downlink Scheduling

Now let's look into a typical downlink scheduling (i.e, PDSCH scheduling). This process can be illustrated as follows, the process can be summarized as follows.

i) NW (Network) send DCI for PDSCH (PDSCH Grant)

ii) After K0 slots after the DCI, PDSCH is transmitted (K0 can be any value from 0 through 32, but as of Sep 2021, only K0 = 0 seems to be supported).

iii) After k1 slots after the PDSCH is transmitted, UE transmit Ack/Nack via UCI. The UCI can be carried by PUCCH or PUSCH depending on situations. The slot carrying the UCI can be utilized in various different form which can be examplified as Case 1,2,3,4 as shown below).

NOTE : The above illustration shows several typical forms of the UCI slot (the slot carrying the UCI). In this illustration, I just presented only 4 different cases but there can be more cases.