S-GW Event Reporting

This chapter describes the record content and trigger mechanisms for S-GW event reporting. When enabled the S-GW writes a record of session events and sends the resulting event files to an external file server for processing. Each event is sent to the server within 60 seconds of its occurrence.


Note

The S-GW Event Reporting feature is applicable to S-GW and SAEGW (Pure-S calls).

This chapter includes the following topics:

S-GW Event Reporting

This chapter describes the record content and trigger mechanisms for S-GW event reporting. When enabled the S-GW writes a record of session events and sends the resulting event files to an external file server for processing. Each event is sent to the server within 60 seconds of its occurrence.


Note

The S-GW Event Reporting feature is applicable to S-GW and SAEGW (Pure-S calls).

This chapter includes the following topics:

Event Record Triggers

When properly configured, the S-GW creates and sends a record in CSV format as the session events listed below occur.

  • ID 1: Session Creation
  • ID 2: Session Deletion
  • ID 3: Bearer Creation
  • ID 4: Bearer Deletion
  • ID 5: Bearer Modification
    • suppress intra-system handover
    • configurable enable active to idle transition event reporting
  • ID 6: Bearer Update

The following guidelines apply to the above session events:

  • A session refers to a PDN connection and the default bearer associated with it.
  • Bearer events refer to dedicated bearers that have been created/deleted/updated/modified.
  • Bearer modifications that are intra-S-GW and intra-MME are not be reported.
  • Bearers and sessions that fail to setup are reported once in a session/bearer creation record with the result code set to failure.

Event Record Elements

Each event record includes the information documented in the table below in comma separated value (CSV) ASCII format. The elements are listed in the order in which they will appear. All record elements are not available for all event triggers. If a record element cannot be populated due to incomplete information, the element is omitted and the comma separation maintained.

The following guidelines apply to record elements:

  • Byte/packet counters shall not be sent in session or bearer creation messages
  • Byte/packet counters include packets and bytes sent or received since the last record created for that session or bearer.
  • The S-GW will attempt to populate all record elements. Values that are unavailable will not be populated.
Table 1. S-GW Event Record Elements

Event Number

Description

Format

Size (bytes)

Applicable Event Numbers

1

Event identity (ID 1 – ID 6)

Integer [1-6]

1

All

2

Event Result (3GPP 29.274 Cause Code)

Integer [1-255]

3

All

3

IMSI

Integer (15 digits)

15

All

4

IMEISV

Integer (16 digits)

16

All

5

Callid

Integer (0-500000000000)

4

All

6

Start Time (GMT)

MM/DD/YYYY-HH:MM:SS:_MS (millisecond accuracy)

18

All

7

End Time (GMT)

MM/DD/YYYY-HH:MM:SS:_MS (millisecond accuracy)

18

2, 4

8

Protocol (GTPv2)

String

5

All

9

Disconnect code (ASR 5500)

Integer [1-999]

3

All

10

Trigger Event (3GPP 29.274 request cause code)

Integer [1-15]

3

All

11

Hostname

IPv4 or IPv6 address

255

All

12

Origination Node

String (CLLI)

10

All

13

Origination Node Type

String (SGW|HSGW|PGW|...)

3

All

14

EPS Bearer ID(Default)

Integer [0-15]

1 or 2

All

15

APN Name

String

34 to 255

All

16

PGW IP Address

IPv4 or IPv6 address

7 to 55

All

17

UE IPv4 Address

IPv4 address

7 to 15

All

18

UE IPv6 Address

IPv6 address

3 to 55

All

19

Uplink AMBR

Integer (0-4000000000)

1 to 10

All

20

Downlink AMBR

Integer (0-4000000000)

1 to 10

All

21

TAI - MCC/MNC/TAC

String (MCC;MNC;TAC)

14

All

22

Cell ID (ECI)

String (28 bits)

8

All

23

EPS Bearer ID (dedicated)

Integer (0-15)

1 or 2

21

24

Result Code (success/fail)

0=fail 1=success

1

All

25

QCI

Integer[1-255]

1 to 3

All

26

Uplink MBR (bps)

Integer (0-4000000000)

1 to 10

All

27

Downlink MBR (bps)

Integer (0-4000000000)

1 to 10

All

28

Uplink GBR (bps)

Integer (0-4000000000)

1 to 10

All

29

Downlink GBR (bps)

Integer (0-4000000000)

1 to 10

All

30

Downlink Packets Sent (interval)

Integer (0-4000000000)

1 to 10

2, 4, 5, 6

31

Downlink Bytes Sent (interval)

Integer (0-500000000000)

1 to 12

2, 4, 5, 6

32

Downlink Packets Dropped (interval)

Integer (0-500000000000)

1 to 12

2, 4, 5, 6

33

Uplink Packets Sent (interval)

Integer (0-500000000000)

1 to 12

2, 4, 5, 6

34

Uplink Bytes Sent (interval)

Integer (0-500000000000)

1 to 12

2, 4, 5, 6

35

Uplink Packets Dropped (interval)

Integer (0-4000000000)

1 to 10

2, 4, 5, 6

36

MME S11 IP Address

IPv4 or IPv6 address

7 to 55

All

37

S1u IP Address of eNodeB

IPv4 or IPv6 address

7 to 55

All

Active-to-Idle Transitions

This table below describes how active-to-idle transitions generate event records.

Table 2. Subscriber-initiated Attach (initial) Call Flow Description

Step

Description

1

UE becomes Active (via UE or NW initiated service request)

2

Session becomes idle.

3

S-GW acknowledges idle session.

4

Bearer modification event record is created, with the following fields:

  • Start Time: Use the start time of the idle-to-active transition

  • End Time: Use the timestamp of the idle time

  • Bytes up/Bytes down: Amount of data sent between transitions

  • Packets up/Packets down: Number of packets sent between transitions

3GPP 29.274 Cause Codes

Table 3. 3GPP 29.274 Cause Codes

Cause Value

Meaning

Request

2

Local Detach

3

Complete

4

RAT changed from 3GPP to Non-3GPP

5

ISR deactivation

6

Error Indication received from RNC/eNodeB

Accept

16

Request accepted

17

Request accepted partially

18

New PDN type due to network preference

19

New PDN type due to single address bearer only

Reject

64

Context Not Found

65

Invalid Message Format

66

Version not supported by next peer

67

Invalid length

68

Service not supported

69

Mandatory IE incorrect

70

Mandatory IE missing

71

Reserved

72

System failure

73

No resources available

74

Semantic error in the TFT operation

75

Syntactic error in the TFT operation

76

Semantic errors in packet filter(s)

77

Syntactic errors in packet filter(s)

78

Missing or unknown APN

79

Unexpected repeated IE

80

GRE key not found

81

Relocation failure

82

Denied in RAT

83

Preferred PDN type not supported

84

All dynamic addresses are occupied

85

UE context without TFT already activated

86

Protocol type not supported

87

UE not responding

88

UE refuses

89

Service denied

90

Unable to page UE

91

No memory available

92

User authentication failed

93

APN access denied - no subscription

94

Request rejected

95

P-TMSI Signature mismatch

96

IMSI not known

97

Semantic error in the TAD operation

98

Syntactic error in the TAD operation

99

Reserved Message Value Received

100

Remote peer not responding

101

Collision with network initiated request

102

Unable to page UE due to Suspension

103

Conditional IE missing

104

APN Restriction type Incompatible with currently active PDN connection

105

Invalid overall length of the triggered response message and a piggybacked initial message

106

Data forwarding not supported

107

Invalid reply from remote peer

116 to 239

Spare. This value range is reserved for Cause values in rejection response message.

Sub-Causes

NO_INFORMATION

ABORTED_BY_SESSION_DELETION

NO_RESPONSE_FROM_MME

INTERNALLY_TRIGGERED

BEARERS_IN_MULTIPLE_PDN_CONNECTIONS

EXPECTED_BEARERS_MISSING_IN_MESSAGE

UNEXPECTED_BEARERS_PRESENT_IN_MESSAGE