[chapter3][5G-NR][Frame Structure ]
参考：
3GPP 38.211
https://www.sharetechnote.com/html/5G/5G_FrameStructure.html
目录：
1： Numerology - Subcarrier Spacing
2： Numerology and Slot Length
3： Numerology and Supported Channels
4： RB（3GPP TS 38101-1）
5： Radio Frame Structure
6： Numerology - Sampling Time
7： Slots
8: Resource Grid
一 Numerology - Subcarrier Spacing（3GPP 38.211-4.2）
，跟 LTE Numerologies（子载波间隔和符号长度）相比，您可以注意到的最突出的区别是NR支持多种不同类型的子载波间隔（在LTE中只有一种类型的子载波间隔，15 Khz）。
![[chapter3][5G-NR][Frame Structure ]_第1张图片](http://img.e-com-net.com/image/info8/657d76aa60434c908cc03ad133527dd9.jpg)
二 Numerology and Slot Length
NR subFrame 固定为1ms
slot 的时间定义为：
子载波间隔定义为：
可以画出如下图
![[chapter3][5G-NR][Frame Structure ]_第2张图片](http://img.e-com-net.com/image/info8/c15f0a33b6a24975a6ead13b564872ef.jpg)
三 Numerology and Supported Channels
不是每一种Numerology都可以用于每一个物理通道和信号。Numerology 和 physical channels 有指定的映射关系
![[chapter3][5G-NR][Frame Structure ]_第3张图片](http://img.e-com-net.com/image/info8/02eabbd2ec1849938c0111fbb45ddc2f.jpg)
四 RB（3GPP TS 38101-1）
1RB=12子载波。
以100Mz，μ=1为例，1RB理论上=30kHz*12=0.36MHz。
100M/0.36M=277.77（个）。
考虑频段边带保护，最后定为273。
3GPP TS 38101-1中对RB数量定义如下：
![[chapter3][5G-NR][Frame Structure ]_第4张图片](http://img.e-com-net.com/image/info8/5c086829f95f42828da1d7f5cad619af.jpg)
![[chapter3][5G-NR][Frame Structure ]_第5张图片](http://img.e-com-net.com/image/info8/f9844448ebfa431ab13ec14cdace411a.jpg)
五 Radio Frame Structure
无线帧 Frame的长度总是10ms，并且子帧subFrame 的长度始终是1ms。
每个slot 固定对应14 symb
The number of consecutive OFDM symbols per subframe is
![[chapter3][5G-NR][Frame Structure ]_第6张图片](http://img.e-com-net.com/image/info8/04583816758f4c04be403ef512be50d4.jpg)
5.1 ><Normal CP, Numerology = 0>
![[chapter3][5G-NR][Frame Structure ]_第7张图片](http://img.e-com-net.com/image/info8/269492d5b14a4b32b570f99ef02169b1.jpg)
5.2 <Normal CP, Numerology = 1 >
![[chapter3][5G-NR][Frame Structure ]_第8张图片](http://img.e-com-net.com/image/info8/55e0f9a96e854f11a2e02dfbf8998a7c.jpg)
5.3 < Normal CP, Numerology = 2 >
在这种配置中，一个子帧中有4个时隙，
这意味着一个无线电帧中有40个时隙。一个时隙中的OFDM符号数为14
![[chapter3][5G-NR][Frame Structure ]_第9张图片](http://img.e-com-net.com/image/info8/c47832b676504a6c91f9b152e3be4fed.jpg)
5.4 < Normal CP, Numerology = 3 >
在这种配置中，一个子帧中有8个时隙，
这意味着一个无线电帧中有80个时隙。一个时隙中的OFDM符号数为14
![[chapter3][5G-NR][Frame Structure ]_第10张图片](http://img.e-com-net.com/image/info8/c721bdd67eff47fd8102ed935403234a.jpg)
5.5 < Normal CP, Numerology = 4 >
![[chapter3][5G-NR][Frame Structure ]_第11张图片](http://img.e-com-net.com/image/info8/6bd92450cce247ada2ecfa64b744a3e1.jpg)
5.6 < Normal CP, Numerology = 5 >
![[chapter3][5G-NR][Frame Structure ]_第12张图片](http://img.e-com-net.com/image/info8/ca330cabeebd4250b0664dd103322139.jpg)
5.6 < Normal CP, Numerology = 6 >
![[chapter3][5G-NR][Frame Structure ]_第13张图片](http://img.e-com-net.com/image/info8/262a5464dbcb4c9cbeb1d5a5adc29f86.jpg)
5.7 < Extended CP, Numerology = 2 >
In this configuration, a subframe has 32 slots in it, it means a radio frame contains 160 slots in it. The number of OFDM symbols within a slot is 14.
![[chapter3][5G-NR][Frame Structure ]_第14张图片](http://img.e-com-net.com/image/info8/d21a2a1e51214a7d9d285e4793af1b37.jpg)
六 Numerology - Sampling Time
Sampling time can be defined differently depending on Numerogy (i.e, Subcarrier Spacing) and in most case two types of Timing Unit Tc and Ts are used.
Tc = 0.509 ns 5G 里面最小采样时间
Ts = 32.552 ns 4G里面最小采样时间
为什么是该值，可以参考一下外文
<How are OFDM Sub Carrier Spacing and Time Samples Related?>
![[chapter3][5G-NR][Frame Structure ]_第15张图片](http://img.e-com-net.com/image/info8/30b3093c501748ceb935a1264d9b52e6.jpg)
![[chapter3][5G-NR][Frame Structure ]_第16张图片](http://img.e-com-net.com/image/info8/1d64ebb1674648b8ac3ec35935631a5a.jpg)
七 slots
3GPP 38.211 给出来每个子帧对应的slot个数，以及每个slot对应的symb.
![[chapter3][5G-NR][Frame Structure ]_第17张图片](http://img.e-com-net.com/image/info8/69ee368864dc4cfaa64a4304cafaae93.jpg)
<38.213 v15.7 -Table 11.1.1-1: Slot formats for normal cyclic prefix>
D : Downlink, U : Uplink, F : Flexible
|
Symbol Number in a slot |
|||||||||||||
Format |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
0 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
1 |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
2 |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
3 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
4 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
5 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
F |
6 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
F |
F |
7 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
F |
F |
F |
8 |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
9 |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
U |
10 |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
11 |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
12 |
F |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
13 |
F |
F |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
14 |
F |
F |
F |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
15 |
F |
F |
F |
F |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
16 |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
17 |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
18 |
D |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
19 |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
20 |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
21 |
D |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
22 |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
U |
23 |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
U |
24 |
D |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
U |
25 |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
U |
U |
26 |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
F |
U |
U |
U |
27 |
D |
D |
D |
F |
F |
F |
F |
F |
F |
F |
F |
U |
U |
U |
28 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
U |
29 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
U |
30 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
F |
U |
31 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
U |
U |
32 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
U |
U |
33 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
F |
U |
U |
34 |
D |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
35 |
D |
D |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
36 |
D |
D |
D |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
37 |
D |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
38 |
D |
D |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
39 |
D |
D |
D |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
40 |
D |
F |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
U |
41 |
D |
D |
F |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
U |
42 |
D |
D |
D |
F |
F |
F |
U |
U |
U |
U |
U |
U |
U |
U |
43 |
D |
D |
D |
D |
D |
D |
D |
D |
D |
F |
F |
F |
F |
U |
44 |
D |
D |
D |
D |
D |
D |
F |
F |
F |
F |
F |
F |
U |
U |
45 |
D |
D |
D |
D |
D |
D |
F |
F |
U |
U |
U |
U |
U |
U |
46 |
D |
D |
D |
D |
D |
F |
U |
D |
D |
D |
D |
D |
F |
U |
47 |
D |
D |
F |
U |
U |
U |
U |
D |
D |
F |
U |
U |
U |
U |
48 |
D |
F |
U |
U |
U |
U |
U |
D |
F |
U |
U |
U |
U |
U |
49 |
D |
D |
D |
D |
F |
F |
U |
D |
D |
D |
D |
F |
F |
U |
50 |
D |
D |
F |
F |
U |
U |
U |
D |
D |
F |
F |
U |
U |
U |
51 |
D |
F |
F |
U |
U |
U |
U |
D |
F |
F |
U |
U |
U |
U |
52 |
D |
F |
F |
F |
F |
F |
U |
D |
F |
F |
F |
F |
F |
U |
53 |
D |
D |
F |
F |
F |
F |
U |
D |
D |
F |
F |
F |
F |
U |
54 |
F |
F |
F |
F |
F |
F |
f |
D |
D |
D |
D |
D |
D |
D |
55 |
D |
D |
F |
F |
F |
U |
U |
U |
D |
D |
D |
D |
D |
D |
62-254 |
Reserved |
|||||||||||||
255 |
UE determines the slot format for the slot based on tdd-UL-DL-ConfigurationCommon, or tdd-ULDL- ConfigurationDedicated and, if any, on detected DCI formats |
|||||||||||||
八 Resource Grid
NR的资源网格定义如下图，你会认为它几乎与LTE资源网格相同。但是物理维度（即，子载波间隔、无线电帧内OFDM符号的数量）在NR中根据Numerology而变化。
![[chapter3][5G-NR][Frame Structure ]_第18张图片](http://img.e-com-net.com/image/info8/6917960426924b3583e67b58dd29a6eb.jpg)
上下行中分配的最大RB数量定义如下：
可以通过RRC 或者 DCI 消息中获得，
![[chapter3][5G-NR][Frame Structure ]_第19张图片](http://img.e-com-net.com/image/info8/15bd933623254e60967b29326b55e486.jpg)