TEMS Investigation KPI Definitions – Video Telephony

TEMS Investigation KPI Definitions – Video Telephony 2009-05-14

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2009-05-14 TEMS Investigation KPI Definitions – Video Telephony

TMS-06:000173 Uen Rev C

Contents

1. Introduction ................................................................1

2. KPIs for Video Telephony..........................................12.1. Service Non-Accessibility [%] .................................................12.2. Service Access Time [s] ..........................................................12.3. Call Cut-off Ratio [%] ..............................................................22.4. Signaling Diagram...................................................................3

2009-05-14 TEMS Investigation KPI Definitions – Video Telephony

TMS-06:000173 Uen Rev C 1(3)

1. Introduction

This document describes in detail how KPIs (Key Performance Indicators) for the video telephony service are calculated in TEMS Investigation 8.0.

Note that KPIs are computed only for mobile-originated (MO) calls, not for mobile-terminated (MT) calls.

The KPI definitions are based on ETSI TS 102 250-2 V1.4.1.

How input data to KPI calculations is collected is not dealt with in this document.

2. KPIs for Video Telephony

2.1. Service Non-Accessibility [%]

Denotes the probability that the end-customer cannot access the service when requested although the phone indicates having network coverage:

Start trigger: RRC Connection Request message sent. There can be more than one RRC Connection Request message per call attempt; the first message shall then be taken as start trigger.Trigger point 1 in section 2.4

Stop trigger: Connect message received from the MSC. In an unsuccessful call attempt, this trigger point is never reached.Trigger point 30 in section 2.4

2.2. Service Access Time [s]

Denotes the time from the moment the “send” button is pressed on the calling phone (after input of MSISDN) until the calling phone receives the Connect message:

Start trigger: RRC Connection Request message sent. There can be more than one RRC Connection Request message per call attempt; the first message shall then be taken as start trigger.Trigger point 1 in section 2.4

Setup Time [s] = tConnect – tRRC Connection Request

# of unsuccessful call attemptsService Non-Accessibility [%] = ------------------------------------------- x 100

total # of call attempts

TEMS Investigation KPI Definitions – Video Telephony 2009-05-14

2(3) Public

Stop trigger: Connect message received from the MSC.Trigger point 30 in section 2.4

2.3. Call Cut-off Ratio [%]

Denotes the probability that a successful service access is ended by a cause other than the intentional termination of the user (calling or called party):

Start trigger: Connect message received.Trigger point 30 in section 2.4

Stop trigger: Disconnect message sent.Trigger point 35 in section 2.4

# of dropped callsCall Cut-off Ratio [%] = ------------------------------------------- x 100

# of successful call attempts

2009-05-14 TEMS Investigation KPI Definitions – Video Telephony

TMS-06:000173 Uen Rev C 3(3)

2.4. Signaling Diagram

UE Network

5

7

1

4

6

8

2

3

14

15

1817

23

26

27

9

12

21

16

28

19

32

24

25

33

46

20

30

22

45

40

37

41

34

36

10

11

13

38

42

39

35

4443

4847

Service

Quality

RRC Connection Request

RRC Connection Setup

Insynch Ind

RRC Connection Setup Complete

Security Mode Command

CM Service Request

Identity Response

Radio Bearer Setup

Alerting

Connect

Radio Bearer Setup Complete

Call Proceeding

Connect Ack

Setup

Relaese

RRC Connection Release

Disconnect

Release complete

Radio Bearer Release

Radio Bearer Release Complete

RRC Connection Release Complete

Security Mode Complete

Idenity Request

Conversation