Content for TS 29.274 Word version: 18.5.0
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| p. 362
12.1 General p. 362
12.1.1 GTP-C overload problem p. 362
12.1.2 Scenarios leading to overload p. 363
12.1.3 Load & overload control concepts p. 363
12.2 Load control solution p. 364
12.2.1 Principles of load control p. 364
12.2.2 Applicability to 3GPP and non-3GPP access based interfaces p. 365
12.2.3 Node level load control p. 365
12.2.4 APN level load control p. 365
12.2.4.1 General p. 365
12.2.4.2 Justifications for APN load control support p. 365
12.2.4.3 Elements of APN load control p. 366
12.2.5 Load Control Information p. 367
12.2.5.1 Definition p. 367
12.2.5.1.1 General description p. 367
12.2.5.1.2 Parameters p. 367
12.2.5.1.3 Handling of parameters p. 369
12.2.5.2 Frequency of inclusion p. 370
12.2.5.3 Limit on maximum number of instances p. 370
12.2.6 Discovery of the support of the feature by the peer node p. 370
12.2.7 Issues in the network with partial support of the feature p. 370
12.3 Overload control solution p. 371
12.3.1 Principles of overload control p. 371
12.3.2 Applicability to 3GPP and non-3GPP access based interfaces p. 371
12.3.3 Node level overload control p. 372
12.3.4 APN level overload control p. 372
12.3.4.1 General p. 372
12.3.4.2 Elements of APN overload control p. 373
12.3.5 Overload Control Information p. 373
12.3.5.1 Definition p. 373
12.3.5.1.1 General description p. 373
12.3.5.1.2 Parameters p. 374
12.3.5.1.3 Handling of parameters p. 376
12.3.5.2 Frequency of inclusion p. 376
12.3.5.3 Limit on maximum number of instances p. 377
12.3.6 Propagating the MME/S4-SGSN identity to the PGW p. 377
12.3.7 Updating the PGW with overload control information of the target MME/S4-SGSN p. 377
12.3.8 The interaction with APN congestion control using the PGW Back-Off Time p. 378
12.3.9 Message throttling p. 378
12.3.9.1 General p. 378
12.3.9.2 Throttling algorithm - "Loss" p. 379
12.3.9.2.1 Description p. 379
12.3.9.3 Message prioritization p. 379
12.3.10 Enforcement of overload control p. 382
12.3.10.1 General p. 382
12.3.10.2 Aspects related to enforcement of the overload control p. 382
12.3.10.2.1 Good throughput of the network p. 382
12.3.10.2.2 Message processing efficiency at the source GTP-C entity p. 382
12.3.10.2.3 Self-protection by the overloaded GTP-C entity p. 382
12.3.10.3 Enforcement of overload control between GTP-C entities in direct contact p. 383
12.3.10.4 Enforcement of overload control between remote GTP-C entities p. 383
12.3.10.4.1 Description p. 383
12.3.11 Discovery of the support of the feature by the peer node p. 383
12.3.12 Issues in the network with partial support of the feature p. 383
12.3.13 Implicit overload control mechanisms p. 383
