Content for TS 29.274 Word version: 18.7.0
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. 371
12.1 General p. 371
12.1.1 GTP-C overload problem p. 371
12.1.2 Scenarios leading to overload p. 371
12.1.3 Load & overload control concepts p. 372
12.2 Load control solution p. 372
12.2.1 Principles of load control p. 372
12.2.2 Applicability to 3GPP and non-3GPP access based interfaces p. 373
12.2.3 Node level load control p. 373
12.2.4 APN level load control p. 374
12.2.4.1 General p. 374
12.2.4.2 Justifications for APN load control support p. 374
12.2.4.3 Elements of APN load control p. 374
12.2.5 Load Control Information p. 375
12.2.5.1 Definition p. 375
12.2.5.1.1 General description p. 375
12.2.5.1.2 Parameters p. 376
12.2.5.1.3 Handling of parameters p. 378
12.2.5.2 Frequency of inclusion p. 378
12.2.5.3 Limit on maximum number of instances p. 378
12.2.6 Discovery of the support of the feature by the peer node p. 378
12.2.7 Issues in the network with partial support of the feature p. 379
12.3 Overload control solution p. 379
12.3.1 Principles of overload control p. 379
12.3.2 Applicability to 3GPP and non-3GPP access based interfaces p. 380
12.3.3 Node level overload control p. 380
12.3.4 APN level overload control p. 381
12.3.4.1 General p. 381
12.3.4.2 Elements of APN overload control p. 381
12.3.5 Overload Control Information p. 381
12.3.5.1 Definition p. 381
12.3.5.1.1 General description p. 381
12.3.5.1.2 Parameters p. 382
12.3.5.1.3 Handling of parameters p. 384
12.3.5.2 Frequency of inclusion p. 385
12.3.5.3 Limit on maximum number of instances p. 385
12.3.6 Propagating the MME/S4-SGSN identity to the PGW p. 385
12.3.7 Updating the PGW with overload control information of the target MME/S4-SGSN p. 386
12.3.8 The interaction with APN congestion control using the PGW Back-Off Time p. 386
12.3.9 Message throttling p. 387
12.3.9.1 General p. 387
12.3.9.2 Throttling algorithm - "Loss" p. 387
12.3.9.2.1 Description p. 387
12.3.9.3 Message prioritization p. 387
12.3.10 Enforcement of overload control p. 390
12.3.10.1 General p. 390
12.3.10.2 Aspects related to enforcement of the overload control p. 390
12.3.10.2.1 Good throughput of the network p. 390
12.3.10.2.2 Message processing efficiency at the source GTP-C entity p. 390
12.3.10.2.3 Self-protection by the overloaded GTP-C entity p. 391
12.3.10.3 Enforcement of overload control between GTP-C entities in direct contact p. 391
12.3.10.4 Enforcement of overload control between remote GTP-C entities p. 391
12.3.10.4.1 Description p. 391
12.3.11 Discovery of the support of the feature by the peer node p. 391
12.3.12 Issues in the network with partial support of the feature p. 392
12.3.13 Implicit overload control mechanisms p. 392
