5G 带宽与频段（一）

频率划分

频率范围根据频率的高低分为FR1（sub 6G）/FR2（毫米波段）, 参考3GPP 38.104 chapter 5.1

https://www.3gpp.org/ftp/Specs/archive/38_series/38.104/38104-hb0.zip

Table 5.1-1: Definition of frequency ranges

Frequency range designation		Corresponding frequency range
FR1		410 MHz – 7125 MHz
FR2	FR2-1	24250 MHz – 52600 MHz
	FR2-2	52600 MHz – 71000 MHz

同时chapter 5.2 也介绍了 operation band的具体划分， 截取一段。

Table 5.2-1: NR operating bands in FR1

NR operating band	Uplink (UL) operating band BS receive / UE transmit FUL,low   –  FUL,high	Downlink (DL) operating band BS transmit / UE receive FDL,low   –  FDL,high	Duplex mode
n1	1920 MHz – 1980 MHz	2110 MHz – 2170 MHz	FDD
n2	1850 MHz – 1910 MHz	1930 MHz – 1990 MHz	FDD
n3	1710 MHz – 1785 MHz	1805 MHz – 1880 MHz	FDD
n5	824 MHz – 849 MHz	869 MHz – 894 MHz	FDD
n7	2500 MHz – 2570 MHz	2620 MHz – 2690 MHz	FDD
n8	880 MHz – 915 MHz	925 MHz – 960 MHz	FDD
n12	699 MHz – 716 MHz	729 MHz – 746 MHz	FDD
n13	777 MHz – 787 MHz	746 MHz – 756 MHz	FDD
n14	788 MHz – 798 MHz	758 MHz – 768 MHz	FDD
n18	815 MHz – 830 MHz	860 MHz – 875 MHz	FDD
n20	832 MHz – 862 MHz	791 MHz – 821 MHz	FDD
n247	1626.5 MHz – 1660.5 MHz	1525 MHz – 1559 MHz	FDD
n25	1850 MHz – 1915 MHz	1930 MHz – 1995 MHz	FDD
n26	814 MHz – 849 MHz	859 MHz – 894 MHz	FDD
n28	703 MHz – 748 MHz	758 MHz – 803 MHz	FDD
n29	N/A	717 MHz – 728 MHz	SDL
n30	2305 MHz – 2315 MHz	2350 MHz – 2360 MHz	FDD
n34	2010 MHz – 2025 MHz	2010 MHz – 2025 MHz	TDD
n38	2570 MHz – 2620 MHz	2570 MHz – 2620 MHz	TDD
n39	1880 MHz – 1920 MHz	1880 MHz – 1920 MHz	TDD
n40	2300 MHz – 2400 MHz	2300 MHz – 2400 MHz	TDD
n41	2496 MHz – 2690 MHz	2496 MHz – 2690 MHz	TDD
n46	5150 MHz – 5925 MHz	5150 MHz – 5925 MHz	TDD (NOTE 3)
n48	3550 MHz – 3700 MHz	3550 MHz – 3700 MHz	TDD
n50	1432 MHz – 1517 MHz	1432 MHz – 1517 MHz	TDD
n51	1427 MHz – 1432 MHz	1427 MHz – 1432 MHz	TDD
n53	2483.5 MHz – 2495 MHz	2483.5 MHz – 2495 MHz	TDD
n65	1920 MHz – 2010 MHz	2110 MHz – 2200 MHz	FDD
n66	1710 MHz – 1780 MHz	2110 MHz – 2200 MHz	FDD
n67	N/A	738 MHz – 758 MHz	SDL
n70	1695 MHz – 1710 MHz	1995 MHz – 2020 MHz	FDD
n71	663 MHz – 698 MHz	617 MHz – 652 MHz	FDD
n74	1427 MHz – 1470 MHz	1475 MHz – 1518 MHz	FDD
n75	N/A	1432 MHz – 1517 MHz	SDL
n76	N/A	1427 MHz – 1432 MHz	SDL
n77	3300 MHz – 4200 MHz	3300 MHz – 4200 MHz	TDD
n78	3300 MHz – 3800 MHz	3300 MHz – 3800 MHz	TDD
n79	4400 MHz – 5000 MHz	4400 MHz – 5000 MHz	TDD
n80	1710 MHz – 1785 MHz	N/A	SUL
n81	880 MHz – 915 MHz	N/A	SUL
n82	832 MHz – 862 MHz	N/A	SUL
n83	703 MHz – 748 MHz	N/A	SUL
n84	1920 MHz – 1980 MHz	N/A	SUL
n85	698 MHz – 716 MHz	728 MHz – 746 MHz	FDD

国内运营商频带分配

信道带宽

在下面的图中可以看到 channel bandwidth= the guardband + the transmission bandwidth

就是我们看到的整个带宽，实际上还少了一个DC等于一个子载波的宽度。

The relationship between the channel bandwidth, the guardband and the transmission bandwidth configuration is shown in figure 5.3.1-1.

Figure 5.3.1-1: Definition of channel bandwidth and transmission bandwidth configuration for one NR channel

Transmission bandwidth configuration

从3GPP的截图我们可以看到FR1也就是sub 6G的 SCS（子载波间隔）有15、30、60khz3种，但是毫米波最高到480khz。

https://www.3gpp.org/ftp/Specs/archive/38_series/38.211/38211-h60.zip

由于这一点我们就知道了为什么38.211 chapter 4.1 general 中定义Tc时用的delta fmax就是这个480khz

The transmission bandwidth configuration NRB for each BS channel bandwidth and subcarrier spacing is specified in table 5.3.2.-1 for FR1 and table 5.3.2-2 for FR2.

Table 5.3.2-1: Transmission bandwidth configuration NRB for FR1

SCS (kHz)	5 MHz	10 MHz	15 MHz	20 MHz	25 MHz	30 MHz	35 MHz	40 MHz	45 MHz	50 MHz	60 MHz	70 MHz	80 MHz	90 MHz	100 MHz
	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB	NRB
15	25	52	79	106	133	160	188	216	242	270	N/A	N/A	N/A	N/A	N/A
30	11	24	38	51	65	78	92	106	119	133	162	189	217	245	273
60	N/A	11	18	24	31	38	44	51	58	65	79	93	107	121	135

Table 5.3.2-2: Transmission bandwidth configuration NRB for FR2-1

SCS (kHz)	50 MHz	100 MHz	200 MHz	400 MHz
	NRB	NRB	NRB	NRB
60	66	132	264	N/A
120	32	66	132	264

Table 5.3.2-3: Transmission bandwidth configuration NRB for FR2-2

SCS (kHz)	100 MHz	400 MHz	800 MHz	1600 MHz	2000 MHz
	NRB	NRB	NRB	NRB	NRB
120	66	264	N/A	N/A	N/A
480	N/A	66	124	248	N/A
960	N/A	33	62	124	148

NOTE: All Tx and Rx requirements are defined based on transmission bandwidth configuration specified in table 5.3.2-1 for FR1 and table 5.3.2-2 and table 5.3.2-3 for FR2.

The transmission bandwidth configuration for NB-IoT is specified in TS 36.104 [13] clause

5.6.5.3.3 Minimum guardband and transmission bandwidth configuration

The minimum guardband for each BS channel bandwidth and SCS is specified in table 5.3.3-1 for FR1 and in table 5.3.3-2 and table 5.3.3-2a for FR2.

Table 5.3.3-1: Minimum guardband (kHz) (FR1)

SCS (kHz)	5 MHz	10 MHz	15 MHz	20 MHz	25 MHz	30 MHz	35 MHz	40 MHz	45 MHz	50 MHz	60 MHz	70 MHz	80 MHz	90 MHz	100 MHz
15	242.5	312.5	382.5	452.5	522.5	592.5	572.5	552.5	712.5	692.5	N/A	N/A	N/A	N/A	N/A
30	505	665	645	805	785	945	925	905	1065	1045	825	965	925	885	845
60	N/A	1010	990	1330	1310	1290	1630	1610	1590	1570	1530	1490	1450	1410	1370

以FR1 100M为例， SCS是30Khz，273个PRB， 每个PRB 12个sub-carriers，

transmission bandwidth = 273*12*30 = 98280Khz

gurdband = 845KHz

DC = 1 SCS = 30Hz

98280 + 845 + 30 = 100 000 KHz = 100Mhz 

通过着个计算我们可以知道100Mhz的带宽是如何分配的