Content for TS 29.274 Word version: 17.4.0
12 GTP-C load & overload control mechanism
12.1 General
12.2 Load control solution
12.3 Overload control solution
12 GTP-C load & overload control mechanism |R12| Word‑p. 358
12.1 General Word‑p. 358
12.1.1 GTP-C overload problem Word‑p. 358
12.1.2 Scenarios leading to overload Word‑p. 359
12.1.3 Load & overload control concepts Word‑p. 359
12.2 Load control solution Word‑p. 360
12.2.1 Principles of load control Word‑p. 360
12.2.2 Applicability to 3GPP and non-3GPP access based interfaces Word‑p. 361
12.2.3 Node level load control Word‑p. 361
12.2.4 APN level load control Word‑p. 361
12.2.4.1 General Word‑p. 361
12.2.4.2 Justifications for APN load control support Word‑p. 361
12.2.4.3 Elements of APN load control Word‑p. 362
12.2.5 Load Control Information Word‑p. 363
12.2.5.1 Definition Word‑p. 363
12.2.5.1.1 General description Word‑p. 363
12.2.5.1.2 Parameters Word‑p. 363
12.2.5.1.2.1 Load Control Sequence Number Word‑p. 363
12.2.5.1.2.2 Load Metric Word‑p. 364
12.2.5.1.2.3 List-of-APN_and_Relative Capacity Word‑p. 364
12.2.5.1.3 Handling of parameters Word‑p. 365
12.2.5.2 Frequency of inclusion Word‑p. 366
12.2.5.3 Limit on maximum number of instances Word‑p. 366
12.2.6 Discovery of the support of the feature by the peer node Word‑p. 366
12.2.7 Issues in the network with partial support of the feature Word‑p. 366
12.3 Overload control solution Word‑p. 367
12.3.1 Principles of overload control Word‑p. 367
12.3.2 Applicability to 3GPP and non-3GPP access based interfaces Word‑p. 367
12.3.3 Node level overload control Word‑p. 368
12.3.4 APN level overload control Word‑p. 368
12.3.4.1 General Word‑p. 368
12.3.4.2 Elements of APN overload control Word‑p. 369
12.3.5 Overload Control Information Word‑p. 369
12.3.5.1 Definition Word‑p. 369
12.3.5.1.1 General description Word‑p. 369
12.3.5.1.2 Parameters Word‑p. 370
12.3.5.1.2.1 Overload Control Sequence Number Word‑p. 370
12.3.5.1.2.2 Period of Validity Word‑p. 370
12.3.5.1.2.3 Overload Reduction Metric Word‑p. 371
12.3.5.1.2.4 List of APNs Word‑p. 371
12.3.5.1.3 Handling of parameters Word‑p. 372
12.3.5.2 Frequency of inclusion Word‑p. 372
12.3.5.3 Limit on maximum number of instances Word‑p. 373
12.3.6 Propagating the MME/S4-SGSN identity to the PGW Word‑p. 373
12.3.7 Updating the PGW with overload control information of the target MME/S4-SGSN Word‑p. 373
12.3.8 The interaction with APN congestion control using the PGW Back-Off Time Word‑p. 374
12.3.9 Message throttling Word‑p. 374
12.3.9.1 General Word‑p. 374
12.3.9.2 Throttling algorithm - "Loss" Word‑p. 375
12.3.9.2.1 Description Word‑p. 375
12.3.9.3 Message prioritization Word‑p. 375
12.3.9.3.1 Description Word‑p. 375
12.3.9.3.2 Based on procedures Word‑p. 376
12.3.9.3.3 Based on session parameters Word‑p. 377
12.3.9.3.4 Based on the Message Priority signalled in the GTP-C message |R14| Word‑p. 377
12.3.10 Enforcement of overload control Word‑p. 378
12.3.10.1 General Word‑p. 378
12.3.10.2 Aspects related to enforcement of the overload control Word‑p. 378
12.3.10.2.1 Good throughput of the network Word‑p. 378
12.3.10.2.2 Message processing efficiency at the source GTP-C entity Word‑p. 378
12.3.10.2.3 Self-protection by the overloaded GTP-C entity Word‑p. 378
12.3.10.3 Enforcement of overload control between GTP-C entities in direct contact Word‑p. 379
12.3.10.4 Enforcement of overload control between remote GTP-C entities Word‑p. 379
12.3.10.4.1 Description Word‑p. 379
12.3.11 Discovery of the support of the feature by the peer node Word‑p. 379
12.3.12 Issues in the network with partial support of the feature Word‑p. 379
12.3.13 Implicit overload control mechanisms Word‑p. 379
