11 Information Elements

25.3243GPPBroadcast/Multicast Control (BMC)Release 17TS

11.1 Message Type

Table 11.1-1: Message Type IE

IE/Group name

Need

Multi

Type and reference

Semantics description

Message Type

MP

Enumerated (0 .. 255)

Table 11.1-2

This IE is coded as the binary representation of the Message Type. This IE is mapped onto a single octet.

Coding of Message Type

Table 11.1-2: Coding of Message Type IE

1

CBS Message

2

Schedule Message

3

CBS41 Message

0, 4.. 255

Reserved for future use (PDUs with this coding will be discarded by this version of the protocol)

11.2 Message ID

Table 11.2-1: Message ID IE

IE/Group name

Need

Multi

Type and reference

Semantics description

Message ID

MP

Octet string (2)

Identification of source and type of CBS message.
The first octet contains octet 1 of the equivalent IE defined in and encoded according to [3] and so on.

11.3 Serial Number

Table 11.3-1: Serial Number IE

IE/Group Name

Need

Multi

Type and reference

Semantics description

Serial Number

MP

Octet string (2)

Identification of variations of a CBS message (part of the overall CBS message identification).
The first octet contains octet 1 of the equivalent IE defined in and encoded according to [3] and so on.

11.4 Data Coding Scheme

Table 11.4-1: Data Coding Scheme IE

IE/Group name

Need

Multi

Type and reference

Semantics description

Data Coding Scheme

MP

Bitstring(8)

Identification of the alphabet/coding and the language applied.
This IE is encoded according to [4].

11.5 CB Data

Table 11.5-1: CB Data IE

IE/Group name

Need

Multi

Type and reference

Semantics description

CB Data

MP

Octet string (N)
N  1

Content of CBS message. The first octet contains octet 1 of the equivalent IE defined in and encoded according to [4] and so on.

NOTE: This IE contains the CB Data as received in the SABP with the length indicator of the PER aligned bit string as received on SABP being removed.

NOTE: The number N is less than or equal to 1246 octets if a GSM CBS message is broadcast.

11.6 Offset to Begin CTCH Block Set Index

Table 11.6-1: Offset to Begin CTCH Block Set Index IE

IE/Group name

Need

Multi

Type and reference

Semantics description

Offset to Begin CTCH BS Index

MP

Integer
(1..255)

Pointer to the first CTCH BS of the next CBS Schedule Period relative to the CTCH BS index of the first part of the current BMC Schedule Message.
This IE is coded as the binary representation of the Offset to Begin CTCH BS Index. This IE is mapped onto a single octet.
The value 0 is reserved.

11.7 Length of CBS Schedule Period

Table 11.7-1: Length of CBS Schedule Period IE

Information Element/Group name

Need

Multi

Type and reference

Semantics description

Length of CBS Schedule Period

MP

Integer
(1..255)

Number of consecutive CTCH BS of the next CBS Schedule Period. Together with Offset to Begin CTCH BS Index it points to the end of the CBS schedule period.
This IE is coded as the binary representation of the Lengh of CBS Schedule Period. This IE is mapped onto a single octet.
The Value 0 is reserved.

11.8 New Message Bitmap

Table 11.8-1: New Message Bitmap IE

Information Element/Group name

Need

Multi

Type and reference

Semantics description

New Message Bitmap

MP

Octet string (N)

if "Length of CBS Schedule Period" mod 8  0 then

N = "Length of CBS Schedule Period" div 8,

else

N = "Length of CBS Schedule Period" div 8 + 1.

Table 11.8-2

Bitmap indicating CTCH BS which contains new CBS Messages completely or partly

Coding of New Message Bitmap.

Table 11.8-2: Coding of New Message Bitmap IE

0

1

2

3

4

5

6

7

Bit

CTCH BS index B

CTCH BS index B+1

CTCH BS index B+2

…

Octet 1

Octet 2

…

…

CTCH BS index E-1

CTCH BS index E

0

0

0

0

Octet n

Legend: B First CTCH BS index of the CBS schedule period, 1  B  256
E Last CTCH BS index of the CBS schedule period,
E = B + Length of CBS Schedule Period – 1

CTCH BS Index i:
Each bit of the New CBS Message Bitmap refers to the content of CTCH BS index i, i=B,…,E. Its meaning is as follows:

1 The CTCH BS index i contains a BMC Message partly or completely which
was either not sent during the previous schedule period,
or sent unscheduled during the preceding schedule period;
or, the CTCH BS is indicated as of free usage, reading advised;
or it contains the Schedule Message partly or complete of the following CBS schedule period,
or it contains a CBS41 Message partly or complete.
The value is 1 both for the first transmission of a given BMC message in the CBS schedule period or a repetition of it within the CBS schedule period.

0 The CTCH BS is such that value 1 is not suitable.

The length of the New Message Bitmap is given by the IE Length of CBS Schedule Period. If it is not a multiple of 8 the remaining bit positions are padded with "0".

11.9 Message Description

Table 11.9-1: Message Description IE

IE/Group Name

Need

Multi

Type and reference

Semantics description

Message Description Type

MP

Enumerated(0..255)

Table 11.9-3

This IE is coded as the binary representation of the Message Description Type. This IE is mapped onto a single octet.

Message ID

CV MDT1

Octet string (2)

This IE is coded as the binary representation of the Message ID. The first octet contains octet 1 of the equivalent IE defined in and encoded according to [3] and so on.

Offset to CTCH BS index of first transmission

CV MDT2

Integer (0..255)

This IE is coded as the binary representation of the Offset to CTCH BS index of first transmission relative to the start of the BMC schedule period. This IE is mapped onto a single octet.

Table 11.9-2: Conditions

Condition

Explanation

MDT1

If Message Description Type = 1 or 5 then:
the CB-Message-Id IE is included

MDT2

If Message Description Type = 0 or 4 then:
the Offset to CTCH BS index of first transmission IE is included pointing to the CTCH BS index where the BMC message is transmitted the first time within the schedule period.

Table 11.9-3: Encoding of Message Description Type

Value

Explanation

0

Repetition of new BMC CBS message within schedule period

1

New BMC CBS message (a BMC CBS message never previously sent)

2

Reading advised

3

Reading optional

4

Repetition of old BMC CBS message within schedule period

5

Old BMC CBS message (repetition of a BMC CBS message sent in a previous schedule period)

6

Schedule message

7

CBS41 message

8

no message

9.. 255

Reserved for future use
(IEs received with this value will be replaced by value 3)

NOTE: Message Description Type values 0, 1, 4, 5 and 6 indicate transmission of a BMC message partly or completely.

11.10 Broadcast Address

Table 11.10-1: Data Coding Scheme IE

IE/Group name

Need

Multi

Type and reference

Semantics description

Broadcast Address

MP

Octet string (5)

Address information for higher layer.
The first octet contains octet 1 of the equivalent IE defined in and encoded according to [8] and so on.

11.11 CB Data41

Table 11.11-1: CB Data IE

IE/Group name

Need

Multi

Type and reference

Semantics description

CB Data41

MP

Octet string (N)
N  1

Content of CBS message (ANSI-41). The first octet contains octet 1 of the equivalent IE defined in and encoded according to [8] and so on.

11.12 CBS Schedule Message Extension

Table 11.12-1: CBS Schedule Message Extension IE

Information Element

Need

Multi

Type and reference

Semantics description

Version

Future extension bitmap

MP

Octet string(1)

REL-6

Extension 0

CV ext0

CBS Message Serial Numbers

Sec 11.13

REL-6

Extension 1

CV ext1

Null

REL-6

Extension 2

CV ext2

Null

REL-6

Extension 3

CV ext3

Null

REL-6

Extension 4

CV ext4

Null

REL-6

Extension 5

CV ext5

Null

REL-6

Extension 6

CV ext6

Null

REL-6

Extension 7

CV ext7

Null

REL-6

Table 11.12-2: Conditions

Condition

Explanation

extn

If bit n of the Future extension bitmap is set to 1 then Extension n is present.

If bit n of the Future extension bitmap is set to 0 then Extension n is not present.

11.13 CBS Message Serial Numbers

Table 11.13: CBS Message Serial Numbers IE

Information Element

Need

Multi

Type and reference

Semantics description

Version

Length of Serial Number List

MP

Integer (0..255)

REL-6

Serial Number List Entry

MP

0 to <Length of Serial Number List

Sec. 11.14

REL-6

11.14 Serial Number List Entry

Table 11.14: Serial Number List Entry IE

Information Element

Need

Multi

Type and reference

Semantics description

Version

Serial Number

MP

Sec. 11.3

The CBS Message Serial Number of the BMC CBS Message referred to by the CTCH BS Index.

REL-6

CTCH BS Index

MP

Integer (0..255)

The CTCH BS Index IE indicates the index of the CTCH BS within the BMC Schedule Period which contains the start of the BMC CBS Message.

This IE is coded as the binary representation of the CTCH BS Index. This IE is mapped onto a single octet.

REL-6

Annex A (informative):
Change history

Change history

Date

TSG #

TSG Doc.

CR

Rev

Cat

Subject/Comment

New version

12/1999

RP-06

RP-99647

–

Approved at TSG-RAN #6 and placed under Change Control

3.0.0

03/2000

RP-07

RP-000042

001

Miscellaneous corrections

3.1.0

RP-07

RP-000042

002

2

Correction of messages and bit ordering

3.1.0

09/2000

RP-09

RP-000360

005

Corrections

3.2.0

12/2000

RP-10

RP-000569

006

1

Correction to ANSI-41 Cell Broadcast Service

3.3.0

03/2001

RP-11

RP-010028

007

Corrections

3.4.0

RP-11

–

–

Upgrade to Release 4 – no technical change

4.0.0

03/2002

RP-15

–

–

Upgrade to Release 5 – no technical change

5.0.0

06/2002

RP-16

RP-020329

010

Clarification on BMC message encoding

5.1.0

12/2002

RP-18

RP-020720

013

1

Bit order in BMC messages

5.2.0

03/2003

RP-19

RP-030102

016

1

Maximum size of BMC PDU

5.3.0

12/2003

RP-22

–

–

Upgrade to Release 6 – no technical changes

6.0.0

06/2004

RP-24

RP-040202

020

Corrections to BMC Schedule message

6.1.0

12/2004

RP-26

RP-040476

024

1

Correction of BMC message bit order and IE coding

6.2.0

06/2005

RP-28

RP-050319

0025

Clarification of RLC concatenation procedure with BMC

6.3.0

09/2005

RP-29

RP-050464

0027

1

Cell Broadcast

6.4.0

03/2006

RP-31

RP-060090

0028

Introduction of Serial Number in BMC Schedule Message

6.5.0

RP-31

–

–

Upgrade to Release 7 – no technical changes

7.0.0

06/2006

RP-32

RP-060363

0030

Interpretation of "Offset to CTCH BS index of first transmission" in BMC Schedule message

7.1.0

12/2007

RP-38

–

–

Upgrade to the Release 8 – no technical change

8.0.0

12/2009

RP-46

–

–

Upgrade to the Release 9 – no technical change

9.0.0

03/2011

RP-51

–

–

–

Upgrade to the Release 10 – no technical change

10.0.0

09/2012

RP-57

–

–

–

Upgrade to the Release 11 – no technical change

11.0.0

09/2014

RP-65

–

–

–

Upgrade to the Release 12 – no technical change

12.0.0

12/2015

RP-70

–

–

–

Upgrade to the Release 13 – no technical change

13.0.0

03/2017

RP-75

–

–

–

Upgrade to Release 14 – no technical change

14.0.0

06/2018

RP-80

–

–

–

Upgrade to Release 15 – no technical change

15.0.0

2020-07

RP-88e

–

–

–

–

Upgrade to Rel-16 version without technical change

16.0.0

2022-03

RP-95e

–

–

–

–

Upgrade to Rel-17 version without technical change

17.0.0