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SGSN Administration Guide, Staros Release 21.17 SGSN Administration Guide, StarOS Release 21.17 First Published: 2019-12-19 Americas Headquarters Cisco Systems, Inc. 170 West Tasman Drive San Jose, CA 95134-1706 USA http://www.cisco.com Tel: 408 526-4000 800 553-NETS (6387) Fax: 408 527-0883 THE SPECIFICATIONS AND INFORMATION REGARDING THE PRODUCTS IN THIS MANUAL ARE SUBJECT TO CHANGE WITHOUT NOTICE. ALL STATEMENTS, INFORMATION, AND RECOMMENDATIONS IN THIS MANUAL ARE BELIEVED TO BE ACCURATE BUT ARE PRESENTED WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED. USERS MUST TAKE FULL RESPONSIBILITY FOR THEIR APPLICATION OF ANY PRODUCTS. THE SOFTWARE LICENSE AND LIMITED WARRANTY FOR THE ACCOMPANYING PRODUCT ARE SET FORTH IN THE INFORMATION PACKET THAT SHIPPED WITH THE PRODUCT AND ARE INCORPORATED HEREIN BY THIS REFERENCE. IF YOU ARE UNABLE TO LOCATE THE SOFTWARE LICENSE OR LIMITED WARRANTY, CONTACT YOUR CISCO REPRESENTATIVE FOR A COPY. The Cisco implementation of TCP header compression is an adaptation of a program developed by the University of California, Berkeley (UCB) as part of UCB's public domain version of the UNIX operating system. All rights reserved. Copyright © 1981, Regents of the University of California. NOTWITHSTANDING ANY OTHER WARRANTY HEREIN, ALL DOCUMENT FILES AND SOFTWARE OF THESE SUPPLIERS ARE PROVIDED “AS IS" WITH ALL FAULTS. CISCO AND THE ABOVE-NAMED SUPPLIERS DISCLAIM ALL WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, THOSE OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OR ARISING FROM A COURSE OF DEALING, USAGE, OR TRADE PRACTICE. IN NO EVENT SHALL CISCO OR ITS SUPPLIERS BE LIABLE FOR ANY INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES, INCLUDING, WITHOUT LIMITATION, LOST PROFITS OR LOSS OR DAMAGE TO DATA ARISING OUT OF THE USE OR INABILITY TO USE THIS MANUAL, EVEN IF CISCO OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. Any Internet Protocol (IP) addresses and phone numbers used in this document are not intended to be actual addresses and phone numbers. Any examples, command display output, network topology diagrams, and other figures included in the document are shown for illustrative purposes only. Any use of actual IP addresses or phone numbers in illustrative content is unintentional and coincidental. All printed copies and duplicate soft copies of this document are considered uncontrolled. See the current online version for the latest version. Cisco has more than 200 offices worldwide. Addresses and phone numbers are listed on the Cisco website at www.cisco.com/go/offices. Cisco and the Cisco logo are trademarks or registered trademarks of Cisco and/or its affiliates in the U.S. and other countries. To view a list of Cisco trademarks, go to this URL: www.cisco.com go trademarks. Third-party trademarks mentioned are the property of their respective owners. The use of the word partner does not imply a partnership relationship between Cisco and any other company. (1721R) © 2019 Cisco Systems, Inc. All rights reserved. CONTENTS PREFACE About this Guide xxxvii Conventions Used xxxvii Supported Documents and Resources xxxix Related Common Documentation xxxix Related Product Documentation xxxix Obtaining Documentation xxxix Contacting Customer Support xxxix CHAPTER 1 1-in-N IMEI Check per SGSN Subscriber 1 Feature Summary and Revision History 1 Feature Description 2 Configuring IMEI Check to EIR for the First 1-N Events 2 Configuring IMEI Check Every N Events in MAP Service 2 Configuring IMEI Check Every N Events in EIR-Profile 2 CHAPTER 2 Serving GPRS Support Node (SGSN) Overview 5 Product Description 5 Qualified Platforms 6 Licenses 6 Network Deployments and Interfaces 6 SGSN and Dual Access SGSN Deployments 7 SGSN/GGSN Deployments 8 S4-SGSN Deployments 9 SGSN Logical Network Interfaces 10 SGSN Core Functionality 13 All-IP Network (AIPN) 13 SGSN Administration Guide, StarOS Release 21.17 iii Contents SS7 Support 14 PDP Context Support 14 Mobility Management 15 GPRS Attach 15 GPRS Detach 15 Paging 16 Service Request 16 Authentication 16 P-TMSI Reallocation 16 P-TMSI Signature Reallocation 16 Identity Request 17 Location Management 17 Session Management 17 PDP Context Activation 17 PDP Context Modification 18 PDP Context Deactivation 18 PDP Context Preservation 18 Charging 18 SGSN in GPRS/UMTS Network 19 SGSN in LTE/SAE Network 20 Features and Functionality 20 3G-2G Location Change Reporting 20 Access Restriction Support on S6d Interface 20 Accounting Path Framework, New for 14.0 21 AAA Changes To Support Location Services (LCS) Feature 21 APN Aliasing 21 Default APN 22 APN Redirection per APN with Lowest Context-ID 22 APN Resolution with SCHAR or RNC-ID 22 APN Restriction 23 Automatic Protection Switching (APS) 23 Authentications and Reallocations -- Selective 24 Avoiding PDP Context Deactivations 24 Backup and Recovery of Key KPI Statistics 24 SGSN Administration Guide, StarOS Release 21.17 iv Contents Bulk Statistics Support 25 Bypassing APN Remap for Specific IMEI Ranges 26 CAMEL Service Phase 3, Ge Interface 26 CAMEL Service 26 CAMEL Support 26 Ge Interface 27 CAMEL Configuration 27 Commandguard 27 Configurable RAB Asymmetry Indicator in RAB Assignment Request 28 Congestion Control 28 Different NRIs for Pooled and Non-pooled RNCs/BSCs 28 Direct Tunnel 29 Direct Tunnel Support on the S4-SGSN 29 Downlink Data Lockout Timer 29 DSCP Templates for Control and Data Packets - Iu or Gb over IP 30 Dual PDP Addresses for Gn/Gp 30 ECMP over ATM 30 EDR Enhancements 30 EIR Selection for Roaming Subscribers 31 Equivalent PLMN 32 Fallback on DNS Failure 32 First Vector Configurable Start for MS Authentication 32 Format Encoding of MNC and MCC in DNS Queries Enhanced 32 Gb Manager 33 GMM-SM Event Logging 33 Gn/Gp Delay Monitoring 33 GTP-C Path Failure Detection and Management 34 GTPv0 Fallback, Disabling to Reduce Signalling 34 Handling Multiple MS Attaches All with the Same Random TLLI 35 HSPA Fallback 35 Ignore Context-ID during 4G/3G Handovers 35 Interface Selection Based on UE Capability 36 Intra- or Inter-SGSN Serving Radio Network Subsystem (SRNS) Relocation (3G only) 36 Lawful Intercept 36 SGSN Administration Guide, StarOS Release 21.17 v Contents Link Aggregation - Horizontal 36 Local DNS 37 Local Mapping of MBR 37 Local QoS Capping 37 Location Change Reporting on the S4-SGSN 38 Location Services 38 Lock/Shutdown the BSC from the SGSN 39 Multiple PLMN Support 39 Network Sharing 39 Benefits of Network Sharing 39 GWCN Configuration 40 MOCN Configuration 40 Implementation 41 NRI-FQDN based DNS resolution for non-local RAIs (2G subscribers) 41 NRI Handling Enhancement 42 NRPCA - 3G 42 NRSPCA Support for S4-SGSN 42 Operator Policy 43 Some Features Managed by Operator Policies 43 Overcharging Protection 43 QoS Traffic Policing per Subscriber 43 QoS Classes 44 QoS Negotiation 44 DSCP Marking 44 Traffic Policing 44 VPC-DI platform support for SGSN 45 Reordering of SNDCP N-PDU Segments 45 RAN Information Management (RIM) 46 S4 Support on the SGSN 46 S3 and S4 Interface Support 46 S4-SGSN Support for "Higher Bit Rates than 16 Mbps"Flag 47 S6d and Gr Interface Support 48 Configurable Pacing of PDP Deactivations on the S4-SGSN 48 DNS SNAPTR Support 48 SGSN Administration Guide, StarOS Release 21.17 vi Contents S4-SGSN Statistics Support 49 S13' Interface Support 49 Idle Mode Signaling Reduction 49 ISR with Circuit Switched Fallback 50 ISD / DSD Message Handling and HSS Initiated Bearer Modification 50 UMTS-GSM AKA Support on the S4-SGSN 51 3G and 2G SGSN Routing Area Update 51 IPv4 and IPv6 PDP Type Override 52 NAPTR-based Dynamic HSS Discovery 53 P-GW Initiated PDP Bearer Deactivation 53 S-GW and P-GW Tunnel and EPS Subscription Recovery 53 Local Configuration of S-GW and S4-SGSN per RAI 53 Configurable GUTI to RAI Conversion Mapping 54 S4-SGSN Support for Fallback to V1 Cause Code in GTPv2 Context Response 54 S4-SGSN Support for Mobility Management Procedures 54 QoS Mapping Support 54 MS Initiated Primary and Secondary Activation 55 Deactivation Procedure Support 55 MS, PGW and HSS Initiated PDP Modification Procedure Support 55 Fallback from the S4 Interface to the Gn Interface 57 Operator Policy Selection of S4 or Gn Interface 57 IDFT Support During Connected Mode Handovers 57 Disassociated DSR Support 58 SGSN Serving Radio Network Subsystem (SRNS) Relocation Support 58 E-UTRAN Service Handover Support 59 Support for Gn Handoff from S4-SGSN to 2G/3G Gn SGSN 59 Suspend/Resume Support on the S4-SGSN 59 Flex Pooling (Iu / Gb over S16) Support on the S4-SGSN 60 LORC Subscriber Overcharging Protection on S4-SGSN 60 Summary of Functional Differences between an S4-SGSN and an SGSN (Gn/Gp) 60 Session Recovery 69 SCTP Parameters for SGSN 70 SGSN Pooling and Iu-Flex / Gb-Flex 71 Gb/Iu Flex Offloading 71 SGSN Administration Guide, StarOS Release 21.17 vii Contents SGSN Supports Enhanced IMSI Range 72 SGSN Support for RAI Based Query 72 SGSN Support For Sending Extended Bits Bi-directionally 72 SGSN support to Ignore PDP Data Inactivity 72 Short Message Service (SMS over Gd) 73 SMS Authentication Repetition Rate 73 SMSC Address Denial 73 Status Updates to RNC 74 Target Access Restricted for the Subscriber Cause Code 74 Topology-based Gateway (GW) Selection 74 Threshold Crossing Alerts (TCA) Support 75 Tracking Usage of GEA Encryption Algorithms 76 Validation of MCC/MNC Values in the Old RAI Field 76 VLR Pooling via the Gs Interface 76 Synchronization of Crash Events and Minicores between Management Cards 77 Zero Volume S-CDR Suppression 77 How the SGSN Works 78 First-Time GPRS Attach 78 PDP Context
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