物理层提供的服务功能汇总：

4.2

Overview of L1 functions

As mentioned in [2, TS 38.201], the physical layer is expected to perform the following functions to provide the data

transport service:

- Error detection on the transport channel and indication to higher layers;

- FEC encoding/decoding of the transport channel;

- Hybrid ARQ soft-combining;

- Rate matching of the coded transport channel to physical channels;

- Mapping of the coded transport channel onto physical channels;

- Power weighting of physical channels;

- Modulation and demodulation of physical channels;

- Frequency and time synchronisation;

- Radio characteristics measurements and indication to higher layers;

- Multiple Input Multiple Output (MIMO) antenna processing;

- RF processing.

L1 functions are modelled for each transport channel in subclause 5.

1、误码检测与上报

2、FEC编译码

3、HARQ重传

4、速率匹配

5、

6、

7、数据调制&解调（星座映射&解映射）

8、频率&时间 同步

9、无线信道特性测量&上报

10、MIMO

11、射频处理

5、数据通路

上行

1、PUSCH 上行共享信道

2、PRACH 随机接入信道

下行

1、PDSCH 下行共享信道

2、PBCH 广播信道

3、PCH  ？

PUSCH&PDSCH&PBCH&PCH介绍：