Saturday, December 26, 2015

eCall with a minimum set of emergency related data (MSD)

Introduction

The topic of "eCall minimum set of data (MSD)" for "Intelligent transport systems" has been defined in Standards since 2011, but only now the companies start to implement the new feature in their products (Telecom Protocol Stacks for car manufacturers).

We have recently added MSD/eCall Encoder/Decoder to our online tool 3GPP Message Analyser:  http://www.3gpp-message-analyser.com/decoder/msd.htm

In this Article we summarize Information about MSD published by 3GPP and British Standard (BSI).

Terms Definition

eCall: A manually or automatically initiated emergency call (TS12) from a vehicle, supplemented with a minimum set of emergency related data (MSD), as defined under the EU Commission’s eSafety initiative.

MSD:  The Minimum Set of Data forming the data component of an eCall sent from a vehicle to a Public Safety Answering Point or other designated emergency call centre. The MSD has a maximum size of 140 bytes and includes, for example, vehicle identity, location information and time-stamp.

PSAP: Public Safety Answering Point

IVS: In-Vehicle System

Overview

eCall, in the context of "Road Traffic and Transport Telematics" (otherwise known as "Intelligent Transport Systems" or "ITS"), can be described as a "user instigated or automatic system to provide notification to public safety answering points, by means of wireless communications, that a vehicle has crashed, and to provide coordinates and a defined minimum set of data, and where possible a voice link to the PSAP.
 

Reference Documents

The "Minimum Set of Data" AND.1 grammar is defined in document "BS EN 15722:2011. Intelligent transport systems eSafety — eCall minimum set of data (MSD)" published by "BSI Standards Publication".
 
The Definition and use of eCall and MSD are described in the following documents:
  1. 3GPP TS 26.267
    No ASN.1 syntax of MSD. The document specifies the eCall In-band Modem, which is used for reliable transmission of the eCall Minimum Set of Data (MSD) from an In-Vehicle System (IVS) to the Public Safety Answering Point (PSAP) via the voice channel of cellular and PSTN networks
  2. 3GPP TS 22.101  Contains high level overview of eCall & MSD.
    No ASN.1 syntax of MSD.
  3. 3GPP TS 26.268Contains high level overview of eCall & MSD.
    No ASN.1 syntax of MSD.
  4. EN 15722:2011 "Intelligent transport systems - eSafety - eCall minimum set of data (MSD)"
  5. eCall Interoperability 2 testing Guide V2.4.3 (2013-09) - contains test scenarios

An eCall shall consist of an emergency call supplemented by a minimum set of emergency related data (MSD). The MSD e.g. vehicle identity, location information and other parameters, is defined by EN 15722:2011 "Intelligent transport systems - eSafety - eCall minimum set of data (MSD)". An eCall may be initiated automatically, for example due to a vehicle collision, or manually by the vehicle occupants.
Additional data (i.e. data not contained in the initial MSD) may be transferred at any time during the eCall (e.g. MSD acknowledgement, resending of the MSD if requested by a PSAP).

Example of Decoded MSD message

The Decoding was done by 3GPP Message Analyser MSD Decoder/Encoder.
Standard Specification Version: 3GPP Rel12:Jun 2015
Message name: ECallMessage
Message PDU(46octets):015C0681D54970D65C3597CA0420C41464583ADE68AC52E9BB8413F149C07414FB414F6010180813E82181823230


             ECallMessage:
01 00000001   id = 1
              msd(MSDMessage):
5C 0.......    Extension of MSDMessage = 0 :Absent
   .1......    optionalAdditionalData = 1 :Present
               MSDStructure:
   ..0.....     Extension of MSDStructure = 0 :Absent
   ...1....     recentVehicleLocationN1 = 1 :Present
   ....1...     recentVehicleLocationN2 = 1 :Present
   .....1..     numberOfPassengers = 1 :Present
   ......00     messageIdentifier = 1
06 000001..
                control(ControlType):
   ......1.      automaticActivation = 1 :True
   .......0      testCall = 0 :False
81 1.......      positionCanBeTrusted = 1 :True
                 VehicleType:
   .0......       VehicleType ENUMERATED value from = 0 :before Extension marker
   ..0000..        VehicleType = 0 :passengerVehicleClassM1
                vehicleIdentificationNumber(VIN):
   ......01      isowmi[0] = 29 :"W"
D5 1101....
   ....0101      isowmi[1] = 21 :"M"
49 01......
   ..001001      isowmi[2] = 9 :"9"
70 011100..      isovds[0] = 28 :"V"
   ......00      isovds[1] = 13 :"D"
D6 1101....
   ....0110      isovds[2] = 25 :"S"
5C 01......
   ..011100      isovds[3] = 28 :"V"
35 001101..      isovds[4] = 13 :"D"
   ......01      isovds[5] = 25 :"S"
97 1001....
   ....0111      isovisModelyear = 31 :"Y"
CA 11......
   ..001010      isovisSeqPlant[0] = 10 :"A"
04 000001..      isovisSeqPlant[1] = 1 :"1"
   ......00      isovisSeqPlant[2] = 2 :"2"
20 0010....
   ....0000      isovisSeqPlant[3] = 3 :"3"
C4 11......
   ..000100      isovisSeqPlant[4] = 4 :"4"
14 000101..      isovisSeqPlant[5] = 5 :"5"
   ......00      isovisSeqPlant[6] = 6 :"6"
64 0110....
                VehiclePropulsionStorageType:
   ....0...      Extension of VehiclePropulsionStorageType = 0 :Absent
   .....1..      gasolineTankPresent = 1 :Indicated afterward
   ......0.      dieselTankPresent = 0 :DEFAULT FALSE
   .......0      compressedNaturalGas = 0 :DEFAULT FALSE
58 0.......      liquidPropaneGas = 0 :DEFAULT FALSE
   .1......      electricEnergyStorage = 1 :Indicated afterward
   ..0.....      hydrogenStorage = 0 :DEFAULT FALSE
   ...1....      gasolineTankPresent = 1 :True
   ....1...      electricEnergyStorage = 1 :True
   .....000     timestamp = 123456789
3A 00111010
DE 11011110
68 01101000
AC 10101...
                VehicleLocation:
   .....100      positionLatitude = 2321364848 : 2321364848 - 2147483648 = 173881200
52 01010010
E9 11101001
BB 10111011
84 10000...
   .....100      positionLongitude = 2189306168 : 2189306168 - 2147483648 = 41822520
13 00010011
F1 11110001
49 01001001
C0 11000...
   .....000     vehicleDirection = 14
74 01110...
                recentVehicleLocationN1(VehicleLocationDelta):
   .....100      latitudeDelta = 522 : 522 - 512 = 10
14 0001010.
   .......0      longitudeDelta = 502 : 502 - 512 = -10
FB 11111011
41 0.......
                recentVehicleLocationN2(VehicleLocationDelta):
   .1000001      latitudeDelta = 522 : 522 - 512 = 10
4F 010.....
   ...01111      longitudeDelta = 492 : 492 - 512 = -20
60 01100...
   .....000     numberOfPassengers = 2
10 00010...
               optionalAdditionalData(AdditionalData):
   .....0..     Range of oid length(octet) = 0 :Up to 127
   ......00      oid length(octet) = 3
18 00011...
   .....000     oid = 01027Dh
08 00001000
13 00010011
E8 11101...
   .....0..     Range of data length(octet) = 0 :Up to 127
   ......00      data length(octet) = 4
21 00100...
   .....001     data = 30304646h
81 10000001
82 10000010
32 00110010
30 00110...
   .....000  Spare Bits = 000b
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