Definition
To uniquely identify each cell in
the GSM PLMN, the network operator needs to allocate one code for each cell,
which is the cell identity (CI). Cell identity, together with LAI, is used for
identity of each cell in the world. (specification 0303).
Format
CI is composed of 16 bits, The available range is from 0
to 65535.
Cell Identity
(CI) is one part of Cell Global Identity (CGI), transmitted in system
information of each cell.
There is
generally no restriction for the allocation of CI. Value from 0 to 65535
(decimal) can be obtained. But it should be ensured that one location area
cannot have two cells with the same CI.
CI is usually
determined in network system design. Except for some special cases, CI value
should not be changed during the operation of the system.
Please
note that one location area is not permitted to have two or more cells using
the same CI. CI on MSC should be the same as that on BSC. Otherwise, MS cannot
make calls in this cell.
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