name: MCC
full_form: Mobile Country Code
context: In the special case of a UTRAN target RNC a possible SGSN that can control that RNC can be identified by RNC-ID. This identifier can be used for SRNS relocation with a U-TRAN target RNC. A subdomain name for use by core network nodes based on RNC-ID shall be derived from the MNC and MCC by adding the label "rnc" to the beginning of the Home Network Realm/Domain (see clause 19.2). The RNC FQDN shall be constructed as: rnc<RNC>.rnc.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org <RNC> shall be Hex coded digits representing the RNC-ID code of the RNC. If there are less than 4 significant digits in <RNC>, one or more "0" digit(s) is/are inserted at the left side to fill the 4 digit coding. NOTE: Above subdomain is for release 8 core network nodes to allow DNS records other than A/AAAA records. The subdomain name in Annex C.3 are still used for existing A/AAAA records for pre-Release 8 nodes and are still used for backward compatibility. However, RNC-ID in Annex C.3 was originally intended for the case where only one SGSN controlled an RNC-ID and gave the SGSN IP address. The usage for the above RNC FQDN is potentially broader and can target an SGSN pool.
description: The Mobile Country Code (MCC) is a unique identifier used in conjunction with the Mobile Network Code (MNC) to form a subdomain name for core network nodes, specifically for deriving the RNC FQDN based on the RNC-ID. This MCC plays a crucial role in identifying and routing communications within the UTRAN target RNC, ensuring efficient SRNS relocation.
explanation: The MCC is classified as an Identifier because it serves as a key component in uniquely identifying a country's mobile network, combining with MNC to create specific identifiers for network nodes. This aligns with the context of numbering, addressing, and identification within 3GPP specifications.
section_title: 19.4.2.7 Target RNC-ID for U-TRAN
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