GR-3053-CORE - Telcordia Information SuperStore

SGW Generic Requirements
GR-3053-CORE
Issue 1
Contents February 2000
vi
4.1.2.8 Provisional Values for Level 2 Timers . . . . . . . . 4–6
4.1.2.9 Link Performance . . . . . . . . . . . . . . . . . . . 4–7
4.1.2.10 False Link Congestion Detection . . . . . . . . . . . 4–8
4.1.3 Signaling Network Functions and Messages (MTP Level 3) . 4–8
4.1.3.1 Message Signaling Unit Information Handling . . . 4–8
4.1.3.1.1 Service Interface Between MTP Level 3
and the Upper Layer . . . . . . . . . . . . 4–8
4.1.3.1.2 Routing Label . . . . . . . . . . . . . . . . 4–9
4.1.3.1.3 Message Discrimination and
Distribution . . . . . . . . . . . . . . . . . 4–9
4.1.3.1.4 Message Routing . . . . . . . . . . . . . . 4–9
4.1.3.1.5 Loadsharing . . . . . . . . . . . . . . . 4–11
4.1.3.1.6 Message Sequencing . . . . . . . . . . . 4–11
4.1.3.2 Signaling Network Management . . . . . . . . . . 4–12
4.1.3.2.1 Signaling Link Activation . . . . . . . . 4–12
4.1.3.2.2 Signaling Link Changeover . . . . . . . 4–12
4.1.3.2.3 Signaling Link Changeback . . . . . . . 4–15
4.1.3.2.4 Forced Rerouting . . . . . . . . . . . . 4–16
4.1.3.2.5 Controlled Rerouting . . . . . . . . . . 4–17
4.1.3.2.6 MTP Restart . . . . . . . . . . . . . . . 4–18
4.1.3.2.7 Management Inhibiting . . . . . . . . . 4–26
4.1.3.2.8 Message Priorities and Congestion
Control . . . . . . . . . . . . . . . . . . 4–28
4.1.3.2.9 False Link Congestion . . . . . . . . . . 4–30
4.1.3.2.10 Signaling Route Management . . . . . . 4–31
4.1.3.2.11 MTP User Flow Control . . . . . . . . . 4–46
4.1.3.2.12 MTP Level 3 Timers . . . . . . . . . . . 4–46
4.1.4 Loss of Connectivity to CCA . . . . . . . . . . . . . . . . . . 4–49
4.2 Core Network/CCA Signaling Interfaces . . . . . . . . . . . . . . . 4–50
4.2.1 Core Network . . . . . . . . . . . . . . . . . . . . . . . . . . 4–51
4.2.1.1 Bearer Connection Control Interface . . . . . . . 4–52
4.2.2 Simple Control Transmission Protocol (SCTP) . . . . . . . 4–53
4.2.2.1 Functional View of SCTP . . . . . . . . . . . . . . 4–53
4.2.2.2 SCTP Protocol Requirements . . . . . . . . . . . . 4–55
4.2.3 MTP3-User Adaptation (M3UA) Layer . . . . . . . . . . . . 4–58
4.2.3.1 M3UA Signaling Message Handling Functions . . 4–59
4.2.3.2 M3UA Routing Data . . . . . . . . . . . . . . . . . 4–59
4.2.3.2.1 Overview of M3UA Routing Data at
SGWs . . . . . . . . . . . . . . . . . . . 4–59
4.2.3.2.2 Requirements for M3UA Routing Data . 4–60
4.2.3.2.3 Requirements for M3UA Routing
Procedures . . . . . . . . . . . . . . . . 4–61
4.2.3.3 SCTP Stream Mapping . . . . . . . . . . . . . . . . 4–61
4.2.3.4 Message Handling During Overload . . . . . . . . 4–62
4.2.3.5 M3UA Network Management Functions . . . . . . 4–63
4.2.3.5.1 Management Inhibiting/Uninhibiting . . 4–63
4.2.3.5.2 Signaling Traffic Flow Control . . . . . 4–64