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SGSN- serving gprs support node - Platform - HW, SW and CLI

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Mustafa Golam

The document outlines the architecture and components of the SGSN (Serving GPRS Support Node) MKVI, detailing hardware, board roles, subsystems, and configuration. Key topics include communication protocols, processor assignments, subsystem functions, and subscriber commands for managing connections. It emphasizes the dual-file server setup for redundancy and the functionality of various application processors in handling telecommunications tasks.

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S-GSN - SERVING GPRSSUPPORT NODE Mustafa Golam
Table of Contents Architecture GSA Board Roles/Details Sub Systems Configuration Overview Subscriber Commands Main KPIs AoB
SGSNARCHITECTUREOVERVIEW 1 Cabinet 2 Magazines a Magazine 1 b Magazine 2 c Magazine 3 (optional) 3 PIUs (Plug-In Units) 4 Fan Units a Fan Unit 1 b Fan Unit 2 c Fan Unit 3 (optional) 5 Fan PIUs 6 Dust Filter 7 PDUs (Power Distribution Units) -48 V DC 8 Cable Shelf / Air Inlet a Cable Shelf / Air Inlet 1 b Cable Shelf / Air Inlet 2 c Cable Shelf / Air Inlet 3 (optional) 9 Backplane Power Distribution Units Blank Panel GSN Magazine Lower Fan GSN Magazine Upper Fan
SGSNMKVI, Dual Access
Backplane Communication All processors in the Distributed Processing Environment are communicating with TCP/UDP/IP. Each processor has an (at least) IP address assigned for inter- processor communication. IP address is assigned via DHCP, Dynamic Host Configuration Protocol. DHCP server runs on Active NCB or on primary FSB. Each processor has hostname eqm0Xs0YpZ. E.g. eqm01s14p2. - X=Magasine Id, 1,2,3 - Y=Slot, 1,2,...,9,a,b,...,15 - Z=Processor, 2
GSA– GSNSupport Application The GSN Support Application ( GSA) contains functionality for backup and restore and other software handling in the node. MKVI: GSA is operated from active NCB or primary FSB. GSA is operated with CLI command (not GSH). GSA is accessed by console port of the board where GSA is running, or by the O&M network (SSH, telnet).
GSA– GSNSupport Application GSS is used for - Initial Installation - Backup/Restore GSS runs services like - DHCP - TFTP - Time - NFS - FTP
Board Roles NCB – Node Control Board - O&M (FM, PM, CM, ...) - Node Supervision FSB – File and Boot Server AP – Application Processor- SGSN Traffic Control (signaling) DP – Device Processor - SS7 - E1/T1/Frame Relay - Payload; Gb stack and GTP-U processing Router – Router Board SS7 Front End- Narrow Band, E1/T1 - Broad Band, ATM - SCTP, SS7/IP
7/21/2017 AP/DPView AP/L AP/L AP/L AP/C Payload DPs SS7 DPs (SS7 device + BE) Routers SS7 FEs Backplane Connection Data Connection data E1/T1 (NB) ATM (BB) ATM Ethernet SCTP (IP)
MKVI Hardware Additional information for each PIU in MkVI IBxxv4 RAM 2GB, Dual Core, Diskless IBENv4 (2 Eth 100/1000Base-T) IBS7v4 (4xE1/T1 with 2 Sofix connectors) IBTEv4 (8xE1/T1 with 4 connectors) IBASv4 (2 ATM/SMF, 2 Eth 10/100/1000Base-T) FSBv4 only board with Disc (73GB), 1MB Cache Separated from the NCB PEBv4 19*100Base-Tx/1000Base-T 2 * 10GBase-CX4 between magazines
MKVI Hardware IBENv4 Item IBENv4 Role #1 Control plane execution Role #2 Payload execution Operating system Linux - Role #1 VxWorks 6.3 – Role #2 PM – CPU Dual Core Power PC 8641A @ 1.3 GHz PM - L2 Cache size 2 * 1 Mbyte @ 1.3 GHz (internal) PM – Memory 2 GB DDR2 Protocol accelerator PAM Appr. 19K Logic Elements (LE), PAM usage Supports IPSec and Mobile encryption, Front ethernet 2 * 100/1000 Mbit/s Backplane ethernet 2 * 100/1000 Mbit/s Console connector Micro DSUB 9 Power consumption, typical 50 W PM Console Ethernet PAM Ethernet PMC
MKVI Hardware FSBv4 Item File Server Board v4 Role File Server Board (FSB) -Software storage, storage of charging records Operating System Linux PM – CPU 7448 – 1.17 GHz PM - L2 Cache size 1MByte @ 1.17 GHz internal PM - DRAM Memory 1 GB DDR1 PM - Hard disk SAS 73 GB (Subject to change) Console Connector Micro-DSUB Front ethernet 2 * 100/1000 Mbit/s Backplane Ethernet 2 * 100/1000 Mbit/s Power Consumption, typical 45 W PM Console Ethernet Ethernet DISK
MKVI Hardware PEBv4 Item Power and Ethernet Board v4 Role Delivers power to the other PIU:s in a magazine, switching the internal ethernet communication, Connectors in the front 9 pole micro DSUB connector for FAN alarm and consol Ethernet ports in the front 3 ports - 10 Gb/s, 2 ports – 1 Gb/s Ethernet in the back plane 19 ports - 100/1000 Mb/s Aggregated switch capacity (magazine) 204 GB ((3*10+21)*2*2) Power filter Yes, also surge protection Power supervision Yes Power consumption, typical 50 W Ethernet switch PMFan alarm Front Rear Power filter -48Vsec-48Vprim Ethernet Ethernet
MkVI– physical interfaces The same physical interfaces are used in Lab and Production and they are Gigabit Ethernet ,electrical interfaces. CoreNet – connects to CE routers GnR1 – board 2.14 port 0 GnR2 – board 2.15 port 0 GnR3 – board 3.11 port 0 GnR4 – board 2.12 port 0 Signalling – connects to CE routers IuC1 – board 2.11 port 1 IuC2 – board 2.12 port 1 GOM – connects to OAM switch GomR1 – board 1.6 port 0 GomR2 – board 1.7 port 0 RanNet – connects to CE routers IuU1 – board 2.11 port 0 IuU2 – board 2.12 port 0 IuU3 – board 2.14 port 1 IuU4 – board 2.15 port 1
MkVI – physical interfaces The same physical interfaces are used in Lab and Production and they are Gigabit Ethernet ,electrical interfaces. FSB – connects to Gigabit switch FSB1 – board 1.17 – port 0 FSB2 – board 1.18 – port 0 Console – connects to Terminal Servers FSB1 – board 1.17 FSB2 – board 1.18 NCB1 – board 1.19 NCB2 – board 1.20
MkVI– FSBv4 Each SGSN-MME on MkVI and later hardware configurations contains two File Server Boards (FSBs) version 4. One of these FSBs is active and provides the file server function to the rest of the node. The other FSB is a standby and must always be ready to take over from the active FSB in case of a failure. The FSBv4 is the only board within the system that contains a hard disk. It handles boot of other boards and shared disk input-output (IO) services for other boards. The disk storage within an FSBv4 provides a secure redundant storage when in pair with another FSB. During normal operation, all modifications of the active FSB disk are continuously mirrored to the standby FSB using the Distributed Replicated Block Device (DRBD) application.
MkVI– FSBv4 The FSBv4 can have the following roles: Primary FSB. The primary FSB is the master central processing unit (CPU) that receives and executes shared disk IO operations. All data stored on the primary FSB is mirrored to the secondary FSB directly when receiving IO operations. Secondary FSB. This Plug-In Unit (PIU) is a hot standby to the primary FSB. The secondary FSB is always able to take over if the primary FSB fails. After a restore or upgrade the secondary FSB has to synchronise with the primary. It's important not to interrupt the disk mirroring, just let it complete. It will take many hours to complete. See next slide for details.
BasicSWArchitecture WPP Capella Business Specific SGSN-G SGSN-W SGSN-E MPS MTS UPS EPS COS MVS CHS CASMSSSIS LISNCS SDS GSS GTS CPS OMS SSS There are different OSs depending on which role a PIU has. Linux runs on APs FSBs, NCBs, and PEBs used in MkV and MkVI hardware. VxWorks runs on Device Processors (DPs) and PIUs with SS7 Front Ends (FEs), SS7 Back Ends (BEs), or routers.
ApplicationSub Systems MPS encapsulates SGSN-G specific functionality that handles GSM specific control procedures, including the RIL-3 protocol. MTS encapsulates the protocol stack of the Gb interface (including the protocol layers NS, BSSGP, LLC, SNDCP). UPS encapsulates SGSN-W specific functionality that handles W-CDMA specific control procedures, including the protocols RANAP and RIL-3. EPS encapsulates MME specific functionality that handles LTE specific control procedures, including the protocols S1AP and RIL-3 (NAS).
BusinessSpecific Sub Systems MVS encapsulates the Visitor Location Register function in the SGSN. GTS implements the protocol GTP. GTS also implements the MBMS broadcast feature for W-CDMA. CHS encapsulates the CDR-based charging function of the SGSN, producing output of CDRs. (Exception: MSS produces CDRs for SMS, but these are sent to CHS for output.) CAS encapsulates the gprsSSF function, being a component in the CAMEL Service Environment (CSE). MSS encapsulates transfer of Short Message Service (SMS) messages through the SGSN (as well as the production of SMS-related CDRs). COS encapsulates configuration of the network element, routing area analysis, and QoS based node admission. COS also facilitates Admission Control towards MPS and UPS regarding SAU/PDP capacity licenses. SSS subsystem is a container Event-Based Statistics (EBS).
Capella SubSystems GSS encapsulates control-signaling protocols (SS7), which are of general usage in telecommunication systems (i.e. not application specific protocols). SDS encapsulates support functions for connecting, maintaining and disconnecting Software Devices in the Transmission System. NCS encapsulates functionality that provides application- independent, multi-processor-related services in a real-time critical environment. LIS encapsulates the Lawful Interception function of the SGSN.
WPPSubSystems OMS encapsulates the functionality for Configuration Management, Fault Management, Performance Management. CPS - DPE encapsulates the support for Distriuted Processing Environment. - RTOS encapsulates the support for Solaris, Linux and VxWorks. CIS - Link encapsulates the support for Ethernet, ATM and E1/T1 drivers. - Routing encapsulates the support for IP connectivity.
Connection A connection is an internal representation of a subscriber. A connection is handled by a pair of AP and payload DP. There are no data on a payload DP for a WCDMA connection when connection is attached only. A WCDMA connection has data on a SS7 DP when IuC connection is established. Replica data for a connection exists on a backup AP. At loss of AP the backup AP will take over the handling of the subscriber. A connection is identified by its internal id: CID, or external ids: TLLI, PTMSI, IMSI, MS-ISDN, TEID, etc. IMSI and MS- ISDN are fixed external identities. TLLI, PTMSI and TEID are derived identities.
AP Environment AP – Application Processor The AP environment is run on the GPBs on MKIV, or IBENv4 running Linux on MKV and MKVI. The AP environment is executed within OTP (Erlang). The central AP (AP/C) runs on the active NCB. The standby AP (AP/S) runs on the passive NCB. The other APs are denoted local APs (AP/L).
DP Environment The payload devices are co-located and distributed in two variants - FR-device, BVC-device, MS-device, GTU-device, Charging-device and LI-device. - BVC-device, MS-device, GTU-device, Charging- device and LI-device. Only IBTE PIUs, which have physical E1, T1 interfaces, will get the FR-device distributed. No FR-devices, BVC-devices and MS-devices are distributed in a pure WCDMA SGSN, since they are only used for GSM.
BasicIP ConfigurationStructure
Service and IP domainInteraction
ConfigurationBreakdown Node Specific Basic Configuration -Node name, GT, CNID, NRI, DNS, NTP, OSS -Feature and Node Functions IP Configuration -Ethernet Configuration - VPN Configuration, Gom, CN, IuC, IuU, Gb, Gn -IP interface Configuration -Routing Configuration -IP Service Configuration Protocol stack and application -Own SS7 stack configuration, subsystem configuration - Gb application -Iu Application -Gn application
ConfigurationBreakdown Interface configuration -Gr interface [sigtran] -IuC interface [Sigtran] -Gb interface [dynamic] -RNC configuration Routing Area -GSM Routing Area [manual+auto] -WCDMA Routing Area [ -Coopeating Routing Area Nodeproperties Parameter and Other services -Node properties - CDR properties -EBM -Gtrule & IMSI
Sample Configuration SGSN01 Configuration SGSN02 Configuration Some Commands Some More Commands
Subscriber Information There are several methods to get specific subscriber info. - gsh get_subscriber - CDRs - ECI - Cxt dump functions on DPs - Event Recording - ITC GTP-U/Gb - Event Based Monitoring - Erlang Trace per IMSI
Get_subscriber CLI command get_subsriber in gsh shell: Usage: get_subscriber -imsi Imsi [-dl 1 | 2] get_subscriber -msisdn Msisdn [-dl 1 | 2] get_subscriber -imei Imei [-dl 1 | 2] get_subscriber -ptmsi Ptmsi [-dl 1 | 2] get_subscriber -tlli Tlli [-dl 1 | 2]
WCDMASubscriber === sysadm@eqm01s14p2 ANCB ~ # gsh get_subscriber -imsi 240999800000000 -dl 2 Subscriber Data ---------------------------------------------------------------------- IMSI : 240999800000000 Mobile Subscriber ISDN No. : 463100000000000 IMEI : 123400000000000 Roaming Status : Home HLR Address : 46990000001 Home PLMN APN Operator Id : mnc021.mcc123.gprs Subscribed Teleservices : MO/MT SMS Network Access Mode : Packet/Circuit Switched Radio Access Technology : UMTS Mobility Management State : PMM-CONNECTED/PMM-IDLE Paging Proceed Flag : Set Routing Area [RAI] : 123-021-5303-30 P-TMSI : 3496595516 (#D069D03C) MSC/VLR Address : Not Gs connected Location Confirmed in HLR : true Data Confirmed by HLR : true Charging Characteristics : Charging Characteristics Profile : Ciphering Algorithm : uea1
WCDMASubscriber Subscribed PDP Id : 1 Type : IPv4 Address : Dynamic Quality of service : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 32000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 2048 maximum bit rate for downlink (kbps) : 4096 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 384 VPLMN allowed : false APN : apn1sgsn350-1.ericsson.com PDP Charging Characteristics : PDP Charging Characteristics Profile :
WCDMASubscriber Active PDP Id : 1 NSAPI : 5 Type requested : IPv4 Address requested : Dynamic APN requested : apn1sgsn350-1.ericsson.com Addressing nature : Dynamic Address in use : 8.16.0.2 APN in use : apn1sgsn350-1.ericsson.com.mnc021.mcc123.gprs GGSN in use : 10.10.104.49 GTP Version, Gn : GTP-99 GGSN Data Address : 10.10.104.49 RNC Data Address : 210.28.10.3/no RAB established Direct Tunnel Invoked : false Quality of service requested : allocation/retention priority : - delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 32000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 2048 maximum bit rate for downlink (kbps) : 4096 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 384
WCDMASubscriber Quality of service negotiated : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 32000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 64 maximum bit rate for downlink (kbps) : 384 residual BER : 1E-5 SDU error ratio : 1E-4 transfer delay (ms) : 300 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 384 UL packets, Iu : 600 UL packets, Gn : 600 UL packets, discarded : 0 DL packets, Iu : 10000 DL packets, Gn : 10000 DL packets, discarded : 0
GSMSubscriber === sysadm@eqm01s14p2 ANCB ~ # gsh get_subscriber -imsi 240999805000000 -dl 2 Subscriber Data ---------------------------------------------------------------------- IMSI : 240999805000000 Mobile Subscriber ISDN No. : 463100005000000 IMEI : 123400050000000 Roaming Status : Home HLR Address : 46990000001 Home PLMN APN Operator Id : mnc021.mcc123.gprs Subscribed Teleservices : MO/MT SMS Network Access Mode : Packet/Circuit Switched Radio Access Technology : GSM Mobility Management State : Ready/Standby Paging Proceed Flag : Set Routing Area [RAI] : 123-021-5201-20 Cell [CGI] : 123-021-5201-1000 P-TMSI : 4041822746 (#F0E9521A) MSC/VLR Address : Not Gs connected Location Confirmed in HLR : true Data Confirmed by HLR : true Charging Characteristics : Charging Characteristics Profile : Ciphering Algorithm : gea3 NSEI : 4201 BVCI : 1000 MS Bucket : MS Bucket Counter (octets) : 1519 MS Bucket Level (percent) : 3 MS Bucket Leak Rate (octets/sec) : 256000 BVC Bucket : BVC Bucket Counter (octets) : 1519 BVC Bucket Level (percent) : 3 BVC Bucket Leak Rate (octets/sec) : 768000 Default MS Bucket Size (octets) : 50000 octets Default MS Bucket Leak Rate (octets/sec) : 256000 octets/sec
GSMSubscriber Subscribed PDP Id : 1 Type : IPv4 Address : Dynamic Quality of service : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 16000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 512 maximum bit rate for downlink (kbps) : 512 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 128 VPLMN allowed : false APN : apn1sgsn350-1.ericsson.com PDP Charging Characteristics : PDP Charging Characteristics Profile :
GSMSubscriber Active PDP Id : 1 NSAPI : 5 Type requested : IPv4 Address requested : Dynamic APN requested : apn1sgsn350-1.ericsson.com Addressing nature : Dynamic Address in use : 8.16.0.3 APN in use : apn1sgsn350-1.ericsson.com.mnc021.mcc123.gprs GGSN in use : 10.10.104.49 GTP Version, Gn : GTP-99 GGSN Data Address : 10.10.104.49 Quality of service requested : allocation/retention priority : - delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 16000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 512 maximum bit rate for downlink (kbps) : 512 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 128
GSMSubscriber Quality of service negotiated : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 16000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no maximum SDU size (octets) : 1400 maximum bit rate for uplink (kbps) : 64 maximum bit rate for downlink (kbps) : 128 residual BER : 1E-5 SDU error ratio : 1E-4 transfer delay (ms) : 300 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 128 UL packets, Gn : 11 UL packets, discarded : 0 DL packets, Gn : 10 DL packets, discarded : 0 SNDCP Send N-PDU Number : 10 N201-U (LLC max frame size) : 1404 Gb, payload state : NO DELAY PFC Bucket : PFC Bucket Counter (octets) : 0 PFC Bucket Level (percent) : 0 PFC Bucket Leak Rate (octets/s) : 0
GSMPayloadState Scheduling State: Gb, payload state : <STATE> The following payload states are available: NO DELAY The context is created but has not yet got a uplink packet and a cellID The cellID on the context is not known by the BSSGP layer in SGSN The BSS CELL bucket is full The BSS has blocked the cell The cell has no transfer capability The BSS MS bucket is full The MS has no radio contact The MS has supended GPRS The SAPI is not idle The SGSN has supended GPRS The BSS PFC bucket is full
Subscriber TracefromCDR CDRs can be decoded with TTX command deasn. deasn9 -b -a cdrr6 chsLog.123 sgsnPDPRecord recordType 18'D servedIMSI 240999805000000F'TBCD servedIMEI 1234000500000001'TBCD servedMSISDN 19463100005000000F'TBCD sgsnAddress iPBinV4Address 0A0A0BC1'H chargingID 2300000003'D ggsnAddressUsed iPBinV4Address 0A0A6831'H //10.10.104.49 apnSelectionMode 0'D pdpType F121'H servedPDPAddress iPAddress iPBinV4Address 08100003'H
Subscriber TracefromCDR chargingCharacteristics 0000'H chChSelectionMode 3'D dynamicAddressFlag 1'D msNetworkCapability F7E0'H nodeID "sgsn350"'S accessPointNameNI "apn1sgsn350-1.ericsson.com"'S accessPointNameOI "mnc021.mcc123.gprs"'S rATType 2'D recordOpeningTime 0906291055442B0200'H duration 594'D causeForRecClosing 0'D listOfTrafficVolumes changeOfCharCondition qosRequested 000B511F71964048843D4048'H qosNegotiated 010B511F738C404874494048'H dataVolumeGPRSUplink 908'D dataVolumeGPRSDownlink 15000'D changeCondition 2'D changeTime 0906291105382B0200'H routingArea 14'H locationAreaCode 1451'H cellIdentifier 03E8'H localSequenceNumber 0'D
Subscriber TracefromCDR chargingCharacteristics 0000'H dynamicAddressFlag 1'D msNetworkCapability F7E0'H nodeID "sgsn350"'S chChSelectionMode 3'D accessPointNameNI "apn1sgsn350-1.ericsson.com"'S accessPointNameOI "mnc021.mcc123.gprs"'S rATType 2'D recordOpeningTime 0906291055442B0200'H duration 594'D causeForRecClosing 0'D listOfTrafficVolumes changeOfCharCondition qosRequested 000B511F71964048843D4048'H qosNegotiated 010B511F738C404874494048'H dataVolumeGPRSUplink 908'D dataVolumeGPRSDownlink 15000'D changeCondition 2'D changeTime 0906291105382B0200'H routingArea 14'H locationAreaCode 1451'H cellIdentifier 03E8'H localSequenceNumber 0'D
Cause for CDR recordClosing normalRelease (0) abnormalRelease (4), cAMELInitCallRelease (5), volumeLimit (16), timeLimit (17), sGSNChange (18), maxChangeCond (19), managementIntervention (20), pLMNChange (101) cancel location - subscription withdrawn (0) delete subscriber (0)
Subscriber Traceby eci commands Supported commands are: - stats Displays connection statistics for SGSN - dist Displays distribution of connections over APs - list Prints a list of subscribers in SGSN - details Prints connection details for a given subscriber - help Displays instructions Use eci help <Command> for detailed syntax of individual commands.
eci stats This is eci version 1.0.0 operating on an SGSN ‘13A-00-00)' (WG). SGSN-G connection statistics: - 173919 SGSN-G connections active ( 55.19 %). - 117236 SGSN-G connections attached ( 37.20 %). - 21528 SGSN-G connections idle ( 6.83 %). - 2426 SGSN-G connections unstable ( 0.83 %)*. --------------------------------------------- - 315109 SGSN-G connections in total. SGSN-W connection statistics: - 87894 SGSN-W connections active ( 54.97 %). - 59493 SGSN-W connections attached ( 37.21 %). - 11164 SGSN-W connections idle ( 6.98 %). - 1329 SGSN-W connections unstable ( 0.89 %)*. --------------------------------------------- - 159880 SGSN-W connections in total. MBMS connection statistics: - 0 MBMS connections active ( - %). - 0 MBMS connections attached ( - %). - 0 MBMS connections idle ( - %). - 0 MBMS connections unstable ( - %)*. --------------------------------------------- - 0 MBMS connections in total.
eci dist This is eci version 1.0.0 operating on an SGSN ‘13A-00-00)' (WG). Distribution of SGSN-G connections over GPBs: GPB active attached idle unstable total replica --------------------------------------------------------------------------------- 1.13.2.1 43585 29298 5474 605 78962 ( 25.0 %) 72820 ( 24.8 %) 1.14.2.1 43459 29331 5560 588 78938 ( 25.0 %) 73593 ( 25.1 %) 1.15.2.1 43571 29546 5652 607 79376 ( 25.1 %) 73291 ( 25.0 %) 1.16.2.1 43288 29171 5404 571 78434 ( 24.8 %) 73532 ( 25.1 %) 1.19.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) 1.20.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) --------------------------------------------------------------------------------- Sum 173903 117346 22090 2371 315710 293236 Distribution of SGSN-W connections over GPBs: GPB active attached idle unstable total replica --------------------------------------------------------------------------------- 1.13.2.1 21875 15134 2866 310 40185 ( 25.1 %) 36709 ( 24.7 %) 1.14.2.1 22052 14659 2876 293 39880 ( 24.9 %) 37190 ( 25.0 %) 1.15.2.1 21923 14975 2831 344 40073 ( 25.0 %) 37158 ( 25.0 %) 1.16.2.1 22098 14793 2884 345 40120 ( 25.0 %) 37709 ( 25.3 %) 1.19.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) 1.20.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) --------------------------------------------------------------------------------- Sum 87948 59561 11457 1292 160258 148766 Distribution of MBMS connections over GPBs:
eci list eci list [-l Limit| -all] [-idle|-attached|-active eci list -all -idle > idle.txt eci list -all -attached > attach.txt eci list -all -active > active.txt eci list -all -unstable > unstable.txt eci list -l 500 -active > active.txt SGSN-G connection details: IMSI MSISDN TLLI(s) State Cid Local AP Replica AP DP --------------------------------------------------------------------------------------------------------- 240999805007295 463100005007295 8031A179 active 82755 1.15.2.1 1.13.2.1 1.12.2.1 + C031A179 SGSN-W connection details: IMSI MSISDN P-TMSI State Cid Local AP Replica AP DP ------------------------------------------------------------------------------------------------------- 240999800001174 463100000001174 F0918F01 active 73502 1.16.2.1 1.15.2.1 1.11.2.1
eci details eci details -cid Cid | -imsi IMSI | -msisdn MSISDN | -tlli TLLI | -ptmsi PTMSI | -tmgi TMGI eci details -imsi 240999805016596 SGSN-G Connection data: - Cid : 77983 - State : active External IDs - IMSI : 240999805016596 - MSISDN : 463100005016596 - IMEI : 123400050165960 - TLLI(s) : 90314F46 D0314F46 Connection located on - Local AP : 1.14.2.1 - Replica AP : 1.15.2.1 - MS device : 1.12.2.1 Dynamic TC worker is parked ->ok
SGSNLog Files ISP log -block/deblock, hw loss/gain, restart, SAU PDP mesurement Ringbufs -Processor wise memory log Alarms/Events Logs -historical alarm & events Mobility and Session Logs -Attach & PDP activation failure log OMS Logs - The OMS_SM_Log is used for logging of O&M service requests. Monitoring Logs - characteristics measurements from all APs SS7 Trace Log - Contains trace printouts from the SS7 sub system. Session Resilience Logs -Logging at start, restart and AP/DP Take Overs NSE Owner Logs -New IP NSE/Lost IP NSE/New GbFr NSE/Deleted GbFr NSE, DP loss/Gain
MainKPIs
Further Study 3GPP Documentation ERLANG Solutions YouTube The Ericsson SGSN/MME, over a Decade of Erlang Success Google
When you’re confused Q??

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SGSN- serving gprs support node - Platform - HW, SW and CLI

  • 1. S-GSN - SERVING GPRSSUPPORT NODE Mustafa Golam
  • 2. Table of Contents Architecture GSA Board Roles/Details Sub Systems Configuration Overview Subscriber Commands Main KPIs AoB
  • 3. SGSNARCHITECTUREOVERVIEW 1 Cabinet 2 Magazines a Magazine 1 b Magazine 2 c Magazine 3 (optional) 3 PIUs (Plug-In Units) 4 Fan Units a Fan Unit 1 b Fan Unit 2 c Fan Unit 3 (optional) 5 Fan PIUs 6 Dust Filter 7 PDUs (Power Distribution Units) -48 V DC 8 Cable Shelf / Air Inlet a Cable Shelf / Air Inlet 1 b Cable Shelf / Air Inlet 2 c Cable Shelf / Air Inlet 3 (optional) 9 Backplane Power Distribution Units Blank Panel GSN Magazine Lower Fan GSN Magazine Upper Fan
  • 5. Backplane Communication All processors in the Distributed Processing Environment are communicating with TCP/UDP/IP. Each processor has an (at least) IP address assigned for inter- processor communication. IP address is assigned via DHCP, Dynamic Host Configuration Protocol. DHCP server runs on Active NCB or on primary FSB. Each processor has hostname eqm0Xs0YpZ. E.g. eqm01s14p2. - X=Magasine Id, 1,2,3 - Y=Slot, 1,2,...,9,a,b,...,15 - Z=Processor, 2
  • 6. GSA– GSNSupport Application The GSN Support Application ( GSA) contains functionality for backup and restore and other software handling in the node. MKVI: GSA is operated from active NCB or primary FSB. GSA is operated with CLI command (not GSH). GSA is accessed by console port of the board where GSA is running, or by the O&M network (SSH, telnet).
  • 7. GSA– GSNSupport Application GSS is used for - Initial Installation - Backup/Restore GSS runs services like - DHCP - TFTP - Time - NFS - FTP
  • 8. Board Roles NCB – Node Control Board - O&M (FM, PM, CM, ...) - Node Supervision FSB – File and Boot Server AP – Application Processor- SGSN Traffic Control (signaling) DP – Device Processor - SS7 - E1/T1/Frame Relay - Payload; Gb stack and GTP-U processing Router – Router Board SS7 Front End- Narrow Band, E1/T1 - Broad Band, ATM - SCTP, SS7/IP
  • 9. 7/21/2017 AP/DPView AP/L AP/L AP/L AP/C Payload DPs SS7 DPs (SS7 device + BE) Routers SS7 FEs Backplane Connection Data Connection data E1/T1 (NB) ATM (BB) ATM Ethernet SCTP (IP)
  • 10. MKVI Hardware Additional information for each PIU in MkVI IBxxv4 RAM 2GB, Dual Core, Diskless IBENv4 (2 Eth 100/1000Base-T) IBS7v4 (4xE1/T1 with 2 Sofix connectors) IBTEv4 (8xE1/T1 with 4 connectors) IBASv4 (2 ATM/SMF, 2 Eth 10/100/1000Base-T) FSBv4 only board with Disc (73GB), 1MB Cache Separated from the NCB PEBv4 19*100Base-Tx/1000Base-T 2 * 10GBase-CX4 between magazines
  • 11. MKVI Hardware IBENv4 Item IBENv4 Role #1 Control plane execution Role #2 Payload execution Operating system Linux - Role #1 VxWorks 6.3 – Role #2 PM – CPU Dual Core Power PC 8641A @ 1.3 GHz PM - L2 Cache size 2 * 1 Mbyte @ 1.3 GHz (internal) PM – Memory 2 GB DDR2 Protocol accelerator PAM Appr. 19K Logic Elements (LE), PAM usage Supports IPSec and Mobile encryption, Front ethernet 2 * 100/1000 Mbit/s Backplane ethernet 2 * 100/1000 Mbit/s Console connector Micro DSUB 9 Power consumption, typical 50 W PM Console Ethernet PAM Ethernet PMC
  • 12. MKVI Hardware FSBv4 Item File Server Board v4 Role File Server Board (FSB) -Software storage, storage of charging records Operating System Linux PM – CPU 7448 – 1.17 GHz PM - L2 Cache size 1MByte @ 1.17 GHz internal PM - DRAM Memory 1 GB DDR1 PM - Hard disk SAS 73 GB (Subject to change) Console Connector Micro-DSUB Front ethernet 2 * 100/1000 Mbit/s Backplane Ethernet 2 * 100/1000 Mbit/s Power Consumption, typical 45 W PM Console Ethernet Ethernet DISK
  • 13. MKVI Hardware PEBv4 Item Power and Ethernet Board v4 Role Delivers power to the other PIU:s in a magazine, switching the internal ethernet communication, Connectors in the front 9 pole micro DSUB connector for FAN alarm and consol Ethernet ports in the front 3 ports - 10 Gb/s, 2 ports – 1 Gb/s Ethernet in the back plane 19 ports - 100/1000 Mb/s Aggregated switch capacity (magazine) 204 GB ((3*10+21)*2*2) Power filter Yes, also surge protection Power supervision Yes Power consumption, typical 50 W Ethernet switch PMFan alarm Front Rear Power filter -48Vsec-48Vprim Ethernet Ethernet
  • 14. MkVI– physical interfaces The same physical interfaces are used in Lab and Production and they are Gigabit Ethernet ,electrical interfaces. CoreNet – connects to CE routers GnR1 – board 2.14 port 0 GnR2 – board 2.15 port 0 GnR3 – board 3.11 port 0 GnR4 – board 2.12 port 0 Signalling – connects to CE routers IuC1 – board 2.11 port 1 IuC2 – board 2.12 port 1 GOM – connects to OAM switch GomR1 – board 1.6 port 0 GomR2 – board 1.7 port 0 RanNet – connects to CE routers IuU1 – board 2.11 port 0 IuU2 – board 2.12 port 0 IuU3 – board 2.14 port 1 IuU4 – board 2.15 port 1
  • 15. MkVI – physical interfaces The same physical interfaces are used in Lab and Production and they are Gigabit Ethernet ,electrical interfaces. FSB – connects to Gigabit switch FSB1 – board 1.17 – port 0 FSB2 – board 1.18 – port 0 Console – connects to Terminal Servers FSB1 – board 1.17 FSB2 – board 1.18 NCB1 – board 1.19 NCB2 – board 1.20
  • 16. MkVI– FSBv4 Each SGSN-MME on MkVI and later hardware configurations contains two File Server Boards (FSBs) version 4. One of these FSBs is active and provides the file server function to the rest of the node. The other FSB is a standby and must always be ready to take over from the active FSB in case of a failure. The FSBv4 is the only board within the system that contains a hard disk. It handles boot of other boards and shared disk input-output (IO) services for other boards. The disk storage within an FSBv4 provides a secure redundant storage when in pair with another FSB. During normal operation, all modifications of the active FSB disk are continuously mirrored to the standby FSB using the Distributed Replicated Block Device (DRBD) application.
  • 17. MkVI– FSBv4 The FSBv4 can have the following roles: Primary FSB. The primary FSB is the master central processing unit (CPU) that receives and executes shared disk IO operations. All data stored on the primary FSB is mirrored to the secondary FSB directly when receiving IO operations. Secondary FSB. This Plug-In Unit (PIU) is a hot standby to the primary FSB. The secondary FSB is always able to take over if the primary FSB fails. After a restore or upgrade the secondary FSB has to synchronise with the primary. It's important not to interrupt the disk mirroring, just let it complete. It will take many hours to complete. See next slide for details.
  • 18. BasicSWArchitecture WPP Capella Business Specific SGSN-G SGSN-W SGSN-E MPS MTS UPS EPS COS MVS CHS CASMSSSIS LISNCS SDS GSS GTS CPS OMS SSS There are different OSs depending on which role a PIU has. Linux runs on APs FSBs, NCBs, and PEBs used in MkV and MkVI hardware. VxWorks runs on Device Processors (DPs) and PIUs with SS7 Front Ends (FEs), SS7 Back Ends (BEs), or routers.
  • 19. ApplicationSub Systems MPS encapsulates SGSN-G specific functionality that handles GSM specific control procedures, including the RIL-3 protocol. MTS encapsulates the protocol stack of the Gb interface (including the protocol layers NS, BSSGP, LLC, SNDCP). UPS encapsulates SGSN-W specific functionality that handles W-CDMA specific control procedures, including the protocols RANAP and RIL-3. EPS encapsulates MME specific functionality that handles LTE specific control procedures, including the protocols S1AP and RIL-3 (NAS).
  • 20. BusinessSpecific Sub Systems MVS encapsulates the Visitor Location Register function in the SGSN. GTS implements the protocol GTP. GTS also implements the MBMS broadcast feature for W-CDMA. CHS encapsulates the CDR-based charging function of the SGSN, producing output of CDRs. (Exception: MSS produces CDRs for SMS, but these are sent to CHS for output.) CAS encapsulates the gprsSSF function, being a component in the CAMEL Service Environment (CSE). MSS encapsulates transfer of Short Message Service (SMS) messages through the SGSN (as well as the production of SMS-related CDRs). COS encapsulates configuration of the network element, routing area analysis, and QoS based node admission. COS also facilitates Admission Control towards MPS and UPS regarding SAU/PDP capacity licenses. SSS subsystem is a container Event-Based Statistics (EBS).
  • 21. Capella SubSystems GSS encapsulates control-signaling protocols (SS7), which are of general usage in telecommunication systems (i.e. not application specific protocols). SDS encapsulates support functions for connecting, maintaining and disconnecting Software Devices in the Transmission System. NCS encapsulates functionality that provides application- independent, multi-processor-related services in a real-time critical environment. LIS encapsulates the Lawful Interception function of the SGSN.
  • 22. WPPSubSystems OMS encapsulates the functionality for Configuration Management, Fault Management, Performance Management. CPS - DPE encapsulates the support for Distriuted Processing Environment. - RTOS encapsulates the support for Solaris, Linux and VxWorks. CIS - Link encapsulates the support for Ethernet, ATM and E1/T1 drivers. - Routing encapsulates the support for IP connectivity.
  • 23. Connection A connection is an internal representation of a subscriber. A connection is handled by a pair of AP and payload DP. There are no data on a payload DP for a WCDMA connection when connection is attached only. A WCDMA connection has data on a SS7 DP when IuC connection is established. Replica data for a connection exists on a backup AP. At loss of AP the backup AP will take over the handling of the subscriber. A connection is identified by its internal id: CID, or external ids: TLLI, PTMSI, IMSI, MS-ISDN, TEID, etc. IMSI and MS- ISDN are fixed external identities. TLLI, PTMSI and TEID are derived identities.
  • 24. AP Environment AP – Application Processor The AP environment is run on the GPBs on MKIV, or IBENv4 running Linux on MKV and MKVI. The AP environment is executed within OTP (Erlang). The central AP (AP/C) runs on the active NCB. The standby AP (AP/S) runs on the passive NCB. The other APs are denoted local APs (AP/L).
  • 25. DP Environment The payload devices are co-located and distributed in two variants - FR-device, BVC-device, MS-device, GTU-device, Charging-device and LI-device. - BVC-device, MS-device, GTU-device, Charging- device and LI-device. Only IBTE PIUs, which have physical E1, T1 interfaces, will get the FR-device distributed. No FR-devices, BVC-devices and MS-devices are distributed in a pure WCDMA SGSN, since they are only used for GSM.
  • 27. Service and IP domainInteraction
  • 28. ConfigurationBreakdown Node Specific Basic Configuration -Node name, GT, CNID, NRI, DNS, NTP, OSS -Feature and Node Functions IP Configuration -Ethernet Configuration - VPN Configuration, Gom, CN, IuC, IuU, Gb, Gn -IP interface Configuration -Routing Configuration -IP Service Configuration Protocol stack and application -Own SS7 stack configuration, subsystem configuration - Gb application -Iu Application -Gn application
  • 29. ConfigurationBreakdown Interface configuration -Gr interface [sigtran] -IuC interface [Sigtran] -Gb interface [dynamic] -RNC configuration Routing Area -GSM Routing Area [manual+auto] -WCDMA Routing Area [ -Coopeating Routing Area Nodeproperties Parameter and Other services -Node properties - CDR properties -EBM -Gtrule & IMSI
  • 30. Sample Configuration SGSN01 Configuration SGSN02 Configuration Some Commands Some More Commands
  • 31. Subscriber Information There are several methods to get specific subscriber info. - gsh get_subscriber - CDRs - ECI - Cxt dump functions on DPs - Event Recording - ITC GTP-U/Gb - Event Based Monitoring - Erlang Trace per IMSI
  • 32. Get_subscriber CLI command get_subsriber in gsh shell: Usage: get_subscriber -imsi Imsi [-dl 1 | 2] get_subscriber -msisdn Msisdn [-dl 1 | 2] get_subscriber -imei Imei [-dl 1 | 2] get_subscriber -ptmsi Ptmsi [-dl 1 | 2] get_subscriber -tlli Tlli [-dl 1 | 2]
  • 33. WCDMASubscriber === sysadm@eqm01s14p2 ANCB ~ # gsh get_subscriber -imsi 240999800000000 -dl 2 Subscriber Data ---------------------------------------------------------------------- IMSI : 240999800000000 Mobile Subscriber ISDN No. : 463100000000000 IMEI : 123400000000000 Roaming Status : Home HLR Address : 46990000001 Home PLMN APN Operator Id : mnc021.mcc123.gprs Subscribed Teleservices : MO/MT SMS Network Access Mode : Packet/Circuit Switched Radio Access Technology : UMTS Mobility Management State : PMM-CONNECTED/PMM-IDLE Paging Proceed Flag : Set Routing Area [RAI] : 123-021-5303-30 P-TMSI : 3496595516 (#D069D03C) MSC/VLR Address : Not Gs connected Location Confirmed in HLR : true Data Confirmed by HLR : true Charging Characteristics : Charging Characteristics Profile : Ciphering Algorithm : uea1
  • 34. WCDMASubscriber Subscribed PDP Id : 1 Type : IPv4 Address : Dynamic Quality of service : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 32000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 2048 maximum bit rate for downlink (kbps) : 4096 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 384 VPLMN allowed : false APN : apn1sgsn350-1.ericsson.com PDP Charging Characteristics : PDP Charging Characteristics Profile :
  • 35. WCDMASubscriber Active PDP Id : 1 NSAPI : 5 Type requested : IPv4 Address requested : Dynamic APN requested : apn1sgsn350-1.ericsson.com Addressing nature : Dynamic Address in use : 8.16.0.2 APN in use : apn1sgsn350-1.ericsson.com.mnc021.mcc123.gprs GGSN in use : 10.10.104.49 GTP Version, Gn : GTP-99 GGSN Data Address : 10.10.104.49 RNC Data Address : 210.28.10.3/no RAB established Direct Tunnel Invoked : false Quality of service requested : allocation/retention priority : - delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 32000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 2048 maximum bit rate for downlink (kbps) : 4096 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 384
  • 36. WCDMASubscriber Quality of service negotiated : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 32000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 64 maximum bit rate for downlink (kbps) : 384 residual BER : 1E-5 SDU error ratio : 1E-4 transfer delay (ms) : 300 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 384 UL packets, Iu : 600 UL packets, Gn : 600 UL packets, discarded : 0 DL packets, Iu : 10000 DL packets, Gn : 10000 DL packets, discarded : 0
  • 37. GSMSubscriber === sysadm@eqm01s14p2 ANCB ~ # gsh get_subscriber -imsi 240999805000000 -dl 2 Subscriber Data ---------------------------------------------------------------------- IMSI : 240999805000000 Mobile Subscriber ISDN No. : 463100005000000 IMEI : 123400050000000 Roaming Status : Home HLR Address : 46990000001 Home PLMN APN Operator Id : mnc021.mcc123.gprs Subscribed Teleservices : MO/MT SMS Network Access Mode : Packet/Circuit Switched Radio Access Technology : GSM Mobility Management State : Ready/Standby Paging Proceed Flag : Set Routing Area [RAI] : 123-021-5201-20 Cell [CGI] : 123-021-5201-1000 P-TMSI : 4041822746 (#F0E9521A) MSC/VLR Address : Not Gs connected Location Confirmed in HLR : true Data Confirmed by HLR : true Charging Characteristics : Charging Characteristics Profile : Ciphering Algorithm : gea3 NSEI : 4201 BVCI : 1000 MS Bucket : MS Bucket Counter (octets) : 1519 MS Bucket Level (percent) : 3 MS Bucket Leak Rate (octets/sec) : 256000 BVC Bucket : BVC Bucket Counter (octets) : 1519 BVC Bucket Level (percent) : 3 BVC Bucket Leak Rate (octets/sec) : 768000 Default MS Bucket Size (octets) : 50000 octets Default MS Bucket Leak Rate (octets/sec) : 256000 octets/sec
  • 38. GSMSubscriber Subscribed PDP Id : 1 Type : IPv4 Address : Dynamic Quality of service : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 16000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 512 maximum bit rate for downlink (kbps) : 512 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 128 VPLMN allowed : false APN : apn1sgsn350-1.ericsson.com PDP Charging Characteristics : PDP Charging Characteristics Profile :
  • 39. GSMSubscriber Active PDP Id : 1 NSAPI : 5 Type requested : IPv4 Address requested : Dynamic APN requested : apn1sgsn350-1.ericsson.com Addressing nature : Dynamic Address in use : 8.16.0.3 APN in use : apn1sgsn350-1.ericsson.com.mnc021.mcc123.gprs GGSN in use : 10.10.104.49 GTP Version, Gn : GTP-99 GGSN Data Address : 10.10.104.49 Quality of service requested : allocation/retention priority : - delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 16000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no_detect maximum SDU size (octets) : 1500 maximum bit rate for uplink (kbps) : 512 maximum bit rate for downlink (kbps) : 512 residual BER : 1E-6 SDU error ratio : 1E-4 transfer delay (ms) : 150 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 128
  • 40. GSMSubscriber Quality of service negotiated : allocation/retention priority : level1 delay class : class1 reliability class : Unack: GTP,LLC. Ack: RLC. Protected data peak throughput (octet/s) : up to 16000 precedence class : high priority mean throughput (octet/h) : best effort traffic class : interactive delivery order : no delivery of erroneous SDU : no maximum SDU size (octets) : 1400 maximum bit rate for uplink (kbps) : 64 maximum bit rate for downlink (kbps) : 128 residual BER : 1E-5 SDU error ratio : 1E-4 transfer delay (ms) : 300 traffic handling priority : level1 guaranteed bit rate for uplink (kbps) : 64 guaranteed bit rate for downlink (kbps) : 128 UL packets, Gn : 11 UL packets, discarded : 0 DL packets, Gn : 10 DL packets, discarded : 0 SNDCP Send N-PDU Number : 10 N201-U (LLC max frame size) : 1404 Gb, payload state : NO DELAY PFC Bucket : PFC Bucket Counter (octets) : 0 PFC Bucket Level (percent) : 0 PFC Bucket Leak Rate (octets/s) : 0
  • 41. GSMPayloadState Scheduling State: Gb, payload state : <STATE> The following payload states are available: NO DELAY The context is created but has not yet got a uplink packet and a cellID The cellID on the context is not known by the BSSGP layer in SGSN The BSS CELL bucket is full The BSS has blocked the cell The cell has no transfer capability The BSS MS bucket is full The MS has no radio contact The MS has supended GPRS The SAPI is not idle The SGSN has supended GPRS The BSS PFC bucket is full
  • 42. Subscriber TracefromCDR CDRs can be decoded with TTX command deasn. deasn9 -b -a cdrr6 chsLog.123 sgsnPDPRecord recordType 18'D servedIMSI 240999805000000F'TBCD servedIMEI 1234000500000001'TBCD servedMSISDN 19463100005000000F'TBCD sgsnAddress iPBinV4Address 0A0A0BC1'H chargingID 2300000003'D ggsnAddressUsed iPBinV4Address 0A0A6831'H //10.10.104.49 apnSelectionMode 0'D pdpType F121'H servedPDPAddress iPAddress iPBinV4Address 08100003'H
  • 43. Subscriber TracefromCDR chargingCharacteristics 0000'H chChSelectionMode 3'D dynamicAddressFlag 1'D msNetworkCapability F7E0'H nodeID "sgsn350"'S accessPointNameNI "apn1sgsn350-1.ericsson.com"'S accessPointNameOI "mnc021.mcc123.gprs"'S rATType 2'D recordOpeningTime 0906291055442B0200'H duration 594'D causeForRecClosing 0'D listOfTrafficVolumes changeOfCharCondition qosRequested 000B511F71964048843D4048'H qosNegotiated 010B511F738C404874494048'H dataVolumeGPRSUplink 908'D dataVolumeGPRSDownlink 15000'D changeCondition 2'D changeTime 0906291105382B0200'H routingArea 14'H locationAreaCode 1451'H cellIdentifier 03E8'H localSequenceNumber 0'D
  • 44. Subscriber TracefromCDR chargingCharacteristics 0000'H dynamicAddressFlag 1'D msNetworkCapability F7E0'H nodeID "sgsn350"'S chChSelectionMode 3'D accessPointNameNI "apn1sgsn350-1.ericsson.com"'S accessPointNameOI "mnc021.mcc123.gprs"'S rATType 2'D recordOpeningTime 0906291055442B0200'H duration 594'D causeForRecClosing 0'D listOfTrafficVolumes changeOfCharCondition qosRequested 000B511F71964048843D4048'H qosNegotiated 010B511F738C404874494048'H dataVolumeGPRSUplink 908'D dataVolumeGPRSDownlink 15000'D changeCondition 2'D changeTime 0906291105382B0200'H routingArea 14'H locationAreaCode 1451'H cellIdentifier 03E8'H localSequenceNumber 0'D
  • 45. Cause for CDR recordClosing normalRelease (0) abnormalRelease (4), cAMELInitCallRelease (5), volumeLimit (16), timeLimit (17), sGSNChange (18), maxChangeCond (19), managementIntervention (20), pLMNChange (101) cancel location - subscription withdrawn (0) delete subscriber (0)
  • 46. Subscriber Traceby eci commands Supported commands are: - stats Displays connection statistics for SGSN - dist Displays distribution of connections over APs - list Prints a list of subscribers in SGSN - details Prints connection details for a given subscriber - help Displays instructions Use eci help <Command> for detailed syntax of individual commands.
  • 47. eci stats This is eci version 1.0.0 operating on an SGSN ‘13A-00-00)' (WG). SGSN-G connection statistics: - 173919 SGSN-G connections active ( 55.19 %). - 117236 SGSN-G connections attached ( 37.20 %). - 21528 SGSN-G connections idle ( 6.83 %). - 2426 SGSN-G connections unstable ( 0.83 %)*. --------------------------------------------- - 315109 SGSN-G connections in total. SGSN-W connection statistics: - 87894 SGSN-W connections active ( 54.97 %). - 59493 SGSN-W connections attached ( 37.21 %). - 11164 SGSN-W connections idle ( 6.98 %). - 1329 SGSN-W connections unstable ( 0.89 %)*. --------------------------------------------- - 159880 SGSN-W connections in total. MBMS connection statistics: - 0 MBMS connections active ( - %). - 0 MBMS connections attached ( - %). - 0 MBMS connections idle ( - %). - 0 MBMS connections unstable ( - %)*. --------------------------------------------- - 0 MBMS connections in total.
  • 48. eci dist This is eci version 1.0.0 operating on an SGSN ‘13A-00-00)' (WG). Distribution of SGSN-G connections over GPBs: GPB active attached idle unstable total replica --------------------------------------------------------------------------------- 1.13.2.1 43585 29298 5474 605 78962 ( 25.0 %) 72820 ( 24.8 %) 1.14.2.1 43459 29331 5560 588 78938 ( 25.0 %) 73593 ( 25.1 %) 1.15.2.1 43571 29546 5652 607 79376 ( 25.1 %) 73291 ( 25.0 %) 1.16.2.1 43288 29171 5404 571 78434 ( 24.8 %) 73532 ( 25.1 %) 1.19.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) 1.20.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) --------------------------------------------------------------------------------- Sum 173903 117346 22090 2371 315710 293236 Distribution of SGSN-W connections over GPBs: GPB active attached idle unstable total replica --------------------------------------------------------------------------------- 1.13.2.1 21875 15134 2866 310 40185 ( 25.1 %) 36709 ( 24.7 %) 1.14.2.1 22052 14659 2876 293 39880 ( 24.9 %) 37190 ( 25.0 %) 1.15.2.1 21923 14975 2831 344 40073 ( 25.0 %) 37158 ( 25.0 %) 1.16.2.1 22098 14793 2884 345 40120 ( 25.0 %) 37709 ( 25.3 %) 1.19.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) 1.20.2.1 0 0 0 0 0 ( 0.0 %) 0 ( 0.0 %) --------------------------------------------------------------------------------- Sum 87948 59561 11457 1292 160258 148766 Distribution of MBMS connections over GPBs:
  • 49. eci list eci list [-l Limit| -all] [-idle|-attached|-active eci list -all -idle > idle.txt eci list -all -attached > attach.txt eci list -all -active > active.txt eci list -all -unstable > unstable.txt eci list -l 500 -active > active.txt SGSN-G connection details: IMSI MSISDN TLLI(s) State Cid Local AP Replica AP DP --------------------------------------------------------------------------------------------------------- 240999805007295 463100005007295 8031A179 active 82755 1.15.2.1 1.13.2.1 1.12.2.1 + C031A179 SGSN-W connection details: IMSI MSISDN P-TMSI State Cid Local AP Replica AP DP ------------------------------------------------------------------------------------------------------- 240999800001174 463100000001174 F0918F01 active 73502 1.16.2.1 1.15.2.1 1.11.2.1
  • 50. eci details eci details -cid Cid | -imsi IMSI | -msisdn MSISDN | -tlli TLLI | -ptmsi PTMSI | -tmgi TMGI eci details -imsi 240999805016596 SGSN-G Connection data: - Cid : 77983 - State : active External IDs - IMSI : 240999805016596 - MSISDN : 463100005016596 - IMEI : 123400050165960 - TLLI(s) : 90314F46 D0314F46 Connection located on - Local AP : 1.14.2.1 - Replica AP : 1.15.2.1 - MS device : 1.12.2.1 Dynamic TC worker is parked ->ok
  • 51. SGSNLog Files ISP log -block/deblock, hw loss/gain, restart, SAU PDP mesurement Ringbufs -Processor wise memory log Alarms/Events Logs -historical alarm & events Mobility and Session Logs -Attach & PDP activation failure log OMS Logs - The OMS_SM_Log is used for logging of O&M service requests. Monitoring Logs - characteristics measurements from all APs SS7 Trace Log - Contains trace printouts from the SS7 sub system. Session Resilience Logs -Logging at start, restart and AP/DP Take Overs NSE Owner Logs -New IP NSE/Lost IP NSE/New GbFr NSE/Deleted GbFr NSE, DP loss/Gain
  • 53. Further Study 3GPP Documentation ERLANG Solutions YouTube The Ericsson SGSN/MME, over a Decade of Erlang Success Google