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发表于 2006-7-3 16:41:00
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<P>还是给你们看看GSM标准吧</P>
简单的说就是GSM工作的几个不同频段,一般同一地区或者同一终端可以拥有一种或者一种以上的工作频段。像现在中国的各大城市大部分都覆盖了GSM900和DCS1800的工作机站,PCS1900,我所了解的台湾地区有部分运营商使用了。
<P>ETSI
Frequency bands and channel arrangement
i) Standard or primary GSM 900 Band, P-GSM:
For Standard GSM 900 band, the system is required to operate in the following frequency band:
890 - 915 MHz: mobile transmit, base receive
935 - 960 MHz: base transmit, mobile receive
ii) Extended GSM 900 Band, E-GSM (includes Standard GSM 900 band):
For Extended GSM 900 band, the system is required to operate in the following frequency band:
880 - 915 MHz: mobile transmit, base receive
925 - 960 MHz: base transmit, mobile receive
iii) Railways GSM 900 Band, R-GSM (includes Standard and Extended GSM 900 Band);
Draft ETSI EN 300 910 V7.1.0 (1999-07) 9 (GSM 05.05 version 7.1.0 Release 1998)
For Railways GSM 900 band, the system is required to operate in the following frequency band:
876 - 915 MHz: mobile transmit, base receive
921 - 960 MHz: base transmit, mobile receive
iv) DCS 1 800 Band:
For DCS 1 800, the system is required to operate in the following band:
1 710 - 1 785 MHz: mobile transmit, base receive
1 805 - 1 880 MHz: base transmit, mobile receive
v) PCS 1 900 Band:
For PCS 1 900, the system is required to operate in the following band:
1850-1910 MHz: mobile transmit, base receive
1930-1990 MHz base transmit, mobile receive
NOTE: The term GSM 900 is used for any GSM system which operates in any 900 MHz band.
NOTE: The BTS may cover the complete band, or the BTS capabilities may be restricted to a subset only,
depending on the operator needs.</P> |
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