The BSS and cell within the BSS are identified within a location area or routeing area by adding a Cell Identity (CI) to
the location area or routeing area identification. The CI is of fixed length with 2 octets and it can
be coded using a full hexadecimal representation.
A Correlation MSISDN is an MSISDN that is used for correlation of sessions at access transfer and to route a call from the IM CN subsystem to the same user in the CS domain.
The C‑MSISDN is
equal to the MSISDN or the basic MSISDN if multinumbering option is used (see
23.008, section 2.1.3)
of the CS access. Any MSISDN of a user that can be used for TS11 (telephony) in the CS domain which is not shared
by more than one IMS Private Identity in an IMS CN subsystem, can serve as the user's C‑MSISDN.
The C-MSISDN is bound to the IMS Private User Identity and is uniquely assigned per IMSI and IMS Private User
If A‑MSISDN is available it shall be used as the C‑MSISDN.
A CN node is uniquely identified within a PLMN by its CN Identifier (CN‑Id). The CN‑Id together with the PLMN
identifier globally identifies the CN node. The CN-Id together with the PLMN‑Id is used as the CN node identifier in
RANAP signalling over the Iu interface.