This standard applies to the capacity series, frequency bands used for narrowband frequency modulation, channel spacing, duplex transceiver spacing, frequency tolerance and wireless working mode of small-capacity, large-capacity and medium-capacity mobile communication networks connected to public communication networks. It also applies to the requirements of private mobile communication networks that are not connected to public communication networks. GB 6280-1986 Capacity series and channel configuration of 25-1000MHz land mobile communication networks GB6280-1986 standard download decompression password: www.bzxz.net

National Standard of the People's Republic of China
Capacity series and frequency channels arrangement in 25 to 1000MHz landmobile telecommunication networkUDC 621.395.74
GB 6280—86
This standard applies to the capacity series, frequency bands used for narrowband frequency modulation, channel spacing, duplex transceiver spacing, frequency tolerance and wireless working mode of small capacity and large and medium capacity mobile communication networks connected to public communication networks. It also applies to the requirements of private mobile communication networks that are not connected to public communication networks.
1 Capacity series
The capacity series is divided into two categories: small capacity and large and medium capacity. The two capacity series are expressed as follows: Small capacity series: 30, 60, 120 users·***. If the number of users is greater than 60, it is superimposed as 60 users. Large and medium capacity series: 500, 1000, 2000, 5000, 10000, 20000, 50000 users. 2 Working frequency bands
160, 450, 900MHz bands.
160MHz band:
138. 000 ~ 149. 900 M Hz
150.050~167.000MHz.
450MHz band:
403.000 ~ 420.000MHz 3
450.000~470.000MHz.
900MHz frequency band:
870.000898.975MHz
915.000 ~ 943.975M Hz.
Among them, the national unified public mobile communication network frequency bands are as follows: 450MHz frequency band:
450.500～453.500MHz (mobile station transmission) 460.500463.500MHz (base station transmission). 900MHz frequency band:
879.000～898.975MHz (mobile station transmission) 924.000～943.975MHz (base station transmission). 3 channel spacing
The adjacent channel spacing of each frequency band is 25kHz. For the 160MHz and 450MHz frequency bands, the last two significant digits of the nominal frequency shall be 00, 25, 50, 75 (in kHz). For the medium-capacity public mobile communication network in the 450MHz frequency band, in order to reduce intermodulation and co-frequency interference within the network, the carrier frequency offset of 12.5kHz is allowed. For the 900MHz frequency band, the last two significant digits of the nominal frequency shall be 12.5, 37.5, 62.5, 87.5 (in kHz). 4 Duplex transceiver interval
GB 6280—86
The duplex transceiver interval for each frequency band is shown in Table 1. The base station frequency transmits high and receives low, and the mobile station frequency receives high and transmits low. Table 1 Duplex transceiver spacing for each frequency band
Frequency band (MHz)
Dual I transceiver spacing (MHz)
5 Frequency tolerance
For the specified power supply voltage range and the temperature range of the mobile environment, the frequency error of any carrier frequency transmission shall not exceed the value given in Table 2.
Table 2 Frequency tolerance for each frequency band
Frequency band (MHz)
Frequency tolerance
6 Spurious radiation of transmitter
10 ×10 -6
5 ×10 -6
3×10-6
Measured on a load with nominal output impedance, when the transmitter carrier power is less than 25W, the spurious radiation power of any discrete frequency shall not exceed 2.5uW. When the transmitter carrier power is greater than 25W, the spurious radiation power of any discrete frequency should be 70dB lower than the transmit carrier power.
7 Required transmission bandwidth
For 160 and 450MHz bands, the transmission bandwidth is 16kHz. For 900MHz band, the transmission bandwidth is 32kHz. Note: Adjacent channels are not used in the same cell or adjacent cells. 8 Adjacent channel powerwwW.bzxz.Net
For 160 and 450MHz bands, the power falling within the 16kHz band of the adjacent channel should be 70dB lower than the carrier power. For 900MHz band, the power falling within the 32kHz band of the second adjacent channel should be 65dB lower than the carrier power. 9 Wireless working mode
9.1 For mobile communication networks that are not connected to the public communication network, the wireless working mode can adopt either heterodyne duplex, same frequency simplex or heterodyne simplex.
9.2 For small-capacity, large-capacity and medium-capacity mobile communication networks that are connected to the public communication network, the wireless working mode adopts heterodyne duplex. 157
GB6280—86
Additional Notes:
This standard was proposed by the Ministry of Posts and Telecommunications of the People's Republic of China and is under the jurisdiction of the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. This standard was drafted by the Telecommunications Transmission Research Institute of the Ministry of Posts and Telecommunications. The main drafters of this standard are Chen Xiasheng, Wang Yuxian and Bao Chunxi. 158
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