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full Table of Contents for  TS 23.003  Word version:   16.2.0

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19  Numbering, addressing and identification for the Evolved Packet Core (EPC) [R8]
19.1  IntroductionUp
19.2  Home Network Realm/Domain
19.3  3GPP access to non-3GPP access interworkingWord-p. 73
19.4  Identifiers for Domain Name System procedures
19.4.1  Introduction
19.4.2  Fully Qualified Domain Names (FQDNs)Word-p. 78
19.4.2.1  General
19.4.2.2  Access Point Name FQDN (APN-FQDN)
19.4.2.3  Tracking Area Identity (TAI)Word-p. 79
3GPP Identifier: TAI (Tracking Area Identity)
A subdomain name can be derived from the TAI. This shall be done by adding the label "tac" to the beginning of the Home Network Realm/Domain (see clause 19.2) and encoding the TAC as a sub-domain. This is called the TAI FQDN.
The TAI FQDN shall be constructed as follows:
tac-lb<TAC-low-byte>.tac-hb<TAC-high-byte>.tac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
19.4.2.4  Mobility Management Entity (MME)
A Mobility Management Entity (MME) within an operator's network is identified using a MME Group ID (MMEGI), and an MME Code (MMEC).
A subdomain name shall be derived from the MNC and MCC by adding the label "mme" to the beginning of the Home Network Realm/Domain (see clause 19.2).
The MME node FQDN shall be constructed as:
mmec<MMEC>.mmegi<MMEGI>.mme.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
Where <MMEC> and <MMEGI> are the hexadecimal strings of the MMEC and MMEGI.
An MME pool FQDN shall be constructed as:
mmegi<MMEGI>.mme.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
If there are less than 2 significant digits in <MMEC>, "0" digit(s) shall be inserted at the left side to fill the 2 digit coding. If there are less than 4 significant digits in <MMEGI>, "0" digit(s) shall be inserted at the left side to fill the 4 digit coding.
19.4.2.5  Routing Area Identity (RAI) - EPCWord-p. 80
The Routing Area Identity (RAI) consists of a RAC, LAC, MNC and MCC.
A subdomain name for use by core network nodes based on RAI shall be derived from the MNC and MCC by adding the label "rac" to the beginning of the Home Network Realm/Domain (see clause 19.2).
The RAI FQDN shall be constructed as:
rac<RAC>.lac<LAC>.rac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
<RAC> and <LAC> shall be Hex coded digits representing the LAC and RAC codes respectively.
If there are less than 4 significant digits in <RAC> or <LAC>, 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.2 are still used for existing A/AAAA records for pre-Release 8 nodes and are also still used for backward compatibility.
19.4.2.6  Serving GPRS Support Node (SGSN) within SGSN pool
A specific SGSN within an operator's network is identified using the RAI FQDN (clause 19.4.2.5) and the Network Resource Identifier (NRI) (see TS 23.236, clause 4.3). Such an identifier can be used by a target MME or SGSN node to connect to the source SGSN node.
The SGSN FQDN shall be constructed as:
nri-sgsn<NRI>.rac<RAC>.lac<LAC>.rac.epc.mnc<MNC>.mcc<MCC>.3gppnetwork.org
<NRI> shall be Hex coded digits representing the NRI code of the SGSN. If there are less than 4 significant digits in <NRI>, one or more "0" digit(s) is/are inserted at the left side to fill the 4 digit coding. Coding for other fields is the same as in clause 19.4.2.5.
When a target MME constructs the FQDN of the source SGSN in the case of SGSN pooling, it should derive the NRI from the 8-bit MME Code received in the GUTI from the UE. However, if the length of the NRI, e.g., X, which is configured in the MME is less than 8 bits, then the MME should use only the most significant X bits of the MME Code as the NRI within the SGSN FQDN.
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.2 are still used for existing A/AAAA records for pre-Release 8 nodes and are also still used for backward compatibility. .
19.4.2.7  Target RNC-ID for U-TRAN
19.4.2.8  DNS subdomain for operator usage in EPCWord-p. 81
19.4.2.9  ePDG FQDN and Visited Country FQDN for non-emergency bearer services
19.4.2.9A  ePDG FQDN for emergency bearer services [R13]Word-p. 84
19.4.2.10  Global eNodeB-ID for eNodeB [R10]
19.4.2.11  Local Home Network identifier [R12]
19.4.2.12  UCMF [R16]Word-p. 87
19.4.3  Service and Protocol service names for 3GPP
19.5  Access Network IdentityWord-p. 89
19.6  E-UTRAN Cell Identity (ECI) and E-UTRAN Cell Global Identification (ECGI)
3GPP Identifier: ECGI (E-UTRAN Cell Global Identification)
19.6A  NR Cell Identity (NCI) and NR Cell Global Identity (NCGI) [R15]
3GPP Identifier: NCGI (NR Cell Global Identification)
19.7  Identifiers for communications with packet data networks and applications [R11]Word-p. 90
19.7.1  Introduction
19.7.2  External Identifier
An External Identifier identifies a subscription associated to an IMSI. A subscription associated to an IMSI may have one or several External Identifier(s).
The External Identifier shall have the form username@realm as specified in clause 2.1 of IETF RFC 4282.
The username part format of the External Identifier shall contain a Local Identifier as specified in TS 23.682, clause 4.6.2. The realm part format of the External Identifier shall contain a Domain Identifier as specified in TS 23.682, clause 4.6.2. As specified in clause 4 of IETF RFC 4282, the Domain Identifier shall be a duly registered Internet domain name. The combination of Local Identifier and Domain Identifier makes the External Identifier globally unique.
The result of the External Identifier form is:
"<Local Identifier>@<Domain Identifier>"
19.7.3  External Group Identifier [R14]
19.8  TWAN Operator Name [R12]Word-p. 91
19.9  IMSI-Group Identifier [R13]Up
3GPP Identifier: IMSI-Group-ID
19.10  Presence Reporting Area Identifier (PRA ID) [R12]
19.11  Dedicated Core Networks Identifier [R14]Word-p. 92

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