URRC, RRCConnectionRequest, 3GPP TS25.331

Message  Description

Message Type: UL-CCCH
Payload (in HEX):"28900101012345678962A5AAA510"

Decoding of Message

Standard Specification Version: 3GPP TS25.331 Rel13 V13.0.0
Message name: UL-CCCH-Message:RRCConnectionRequest
Message PDU(14octets):28900101012345678962A5AAA510

ERROR found in BS EN 15722:2011 "Intelligent transport systems —eSafety — eCall minimum setof data (MSD)"

ERROR DESCRIPTION

There seems to be an error in the document BS EN 15722:2011  "Intelligent transport systems —eSafety — eCall minimum set  of data (MSD)" on page 18.

The example MSD message is decoded wrongly: the Decoding in the document mentions value "<isowmi>WMI</isowmi>", while it shall be "<isowmi>WM9</isowmi>".

 

We have found the error while working on development of our Encoder/Decoder for eCall MSD Messages.

You can check the correct Decoding using our online tool:  http://www.3gpp-message-analyser.com/decoder/msd.htm 

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).

How to decode/encode SMS Message Content (GSM7 alphabet)

Link to use: http://www.3gpp-message-analyser.com/decoder/nas.htm

Example message (PDU): 09015D010107919471016700000051040D91945161428518F5000031706211056480454537FD1C769FCBEEB21C1474CBEB669D6245CBC56A319B8C56C3E1623545B80D92D95CB09B0B546F8362315D0D06AAA2E58A245A5E0651CBECF2FADD06 

Below you find list of steps "How to Decode" with description of each step.

Testing Closed Subscriber Group (CSG)

RR: System Information Messages

Description:
two EARFCNs are defined as CSG: 8, 512.

System Information Type 2 quater, Index 0/Count 2
                      E-UTRAN CSG Description:
            CSG_PSC_SPLIT list(0) = 1 :Present
             E-UTRAN_FREQUENCY_INDEX list(0):
               E-UTRAN_FREQUENCY_INDEX(0) = 0    => refers to EARFCN 8
               E-UTRAN_FREQUENCY_INDEX(1) = 2    => refers to EARFCN 512
PDU: 05 06 07 00 40 17 00 41 C6 42 28 00

System Information Type 2 quater, Index 1/Count 2, E-UTRAN Cells(num=4): 00 c8, 00 08, 02 00
           CSN_EARFCN (HEX):= 00 c8
           CSN_EARFCN (HEX):= 00 08
           CSN_EARFCN (HEX):= 02 00
PDU: 05 06 07 02 40 04 86 45 8A 03 00 C8 40 02 10 20 00 00 0B 2B 2B 

System Information Type 2 quater, Index 2/Count 2, E-UTRAN Cells(num=5): 00 c7, 00 18, 00 40, 00 08, 00 28 
            CSN_EARFCN (HEX):= 00 c7            CSN_EARFCN (HEX):= 00 18            CSN_EARFCN (HEX):= 00 40            CSN_EARFCN (HEX):= 00 08            CSN_EARFCN (HEX):= 00 28
PDU: 05 06 07 04 40 04 86 45 8A 03 00 C7 40 06 10 04 04 00 21 00 28 00 00

Standards

3GPP TS 44.060, Release 9
3GPP TS 44.018, Release 9

How to decode a message?

Select which message you want to decode:

UTRAN RRC , E-UTRAN RRC , NAS , GERAN RRC , GERAN RLC/MAC , GAN / VoLGA

A new window will open. Enter the message PDU and click "Parse" button.

How to create a new message?

Select which message you want to create:
UTRAN RRC , E-UTRAN RRC , NAS , GERAN RRC , GERAN RLC/MAC , GAN / VoLGA

A new window will open. Leave the PDU field empty and click "Parse" button.

How to use the Decoder/Encoder?

When you want to analyse & edit a message PDU:

1. Select a necessary protocol type:

• UTRAN RRC
• E-UTRAN RRC
• E-UTRAN LPP
• NAS 
• GERAN RRC
• GERAN RLC/MAC
• LAPDm, LLC PDU & RRLP
• GAN / VoLGA

2. On the displayed page select message type, 3gpp release etc., enter the message PDU and push [Parse] button. Result of decoding will be displayed.

What is 3GPP message analyser?

3GPP message analyser provides a functionality to decode and encode the protocol stack messages between mobile station and network defined by 3GPP standard.

The decoder is a WEB based application for decoding and encoding protocol stack (2G / 3G / LTE) messages defined by 3GPP standard and encoded using ASN.1 algorithm.

Supported protocol stack layers:

•  GSM (2G) : RLC - Radio Link Control, MAC, RRC - Radio Resource Control 
•  UMTS (3G) : RRC - Radio Resource Control 
•  LTE (3.5G/4G) : RRC - Radio Resource Control