day 1 session 3

System Information

System Information transmitted on BCCH and SACCH

Upon completion of this lesson, you will be able to:

- Explain the organization of every SysInfo message

- Identify on which logical channel every SysInfo is broadcast

- Relate the transmission cycle of SysInfo

- Explain the use of each System Information

Objectives

Mobile Station

Base Station

type 1 type 2 type 2bis type 2ter type 3 type 4

type 5 type 6 type 5bis type 5ter type 7 type 8

System Information Overview

type 1 Control RACH + cell allocation

Control RACH + BCCH allocation

Control RACH + ext BCCH allocation

Extension BCCH allocation

Control RACH + LAI + cell info

Cell reselection parameters

Cell reselection parameters

Control RACH + cell info (CBCH)

BCCH allocation

BCCH allocation extension

BCCH allocation extension

LAI + cell information

0 1 2 3 4 46 47 48 49 50 5 6 7 8 9

BCCH

extension BCCH

0 1 2 3 4 46 47 48 49 50 5 6 7 8 9

SACCH

0 1 2 23 24 25 10 11 12 9 13 14 15

type 2

type 2bis

type 2ter

type 3

type 4

type 5

type 6

type 7

type 8

type 5bis

type 5ter

51-multiframe

26-multiframe

51-multiframe

System Information and Logical Channels

TC=6 TC=6 TC=5 TC=5 TC=4 TC=4 TC=2 TC=2 TC=1 TC=3 TC=7 TC=0 TC=0 TC=7 TC=3

53244 53245 53247 53246 0 1 2 3 4 5 6 7 8 53242 53243

B C C H

0 1 2 3 4 46 47 48 49 50 5

51-multiframe

6

extension B C C H

7 8 9

TC=7

TC=5

TC=3

TC=1

TC=0

sent on System Information

TC=4 or TC=5

TC=2 and TC=6

TC=3 and TC=7

Type 1

Type 2

Type 3

Type 4

Type 2ter

Type 2bis

Type 7

Type 8

frequency

once every 1.88 s (if sent)

once every 1.88 s



twice every 1.88 s

twice every 1.88 s



1 Hyperframe = 53248 x 51-Multiframes

@ 235 ms

@ 1.88 s

Mapping of BCCH Data

Message Type

SYSTEM INFORMATION TYPE ....

Skip Indicator

indicates if the message shall be ignored or not.

Protocol Discriminator

RR message

L2 Pseudo Length

.... bytes

SYS INFO Rest Octets spare bits reserved for new information in later phases

SYS INFO Content

General Description

23 info bytes

B C C H

Cell Channel Description

Message Type

Skip Indicator


L2 Pseudo Length

RACH Control Parameters

SYS INFO 1 Rest Octets

4

bit

s

4

bit

s

8

bit

s

8

bit

s

128 bits 24 bits

8

bit

s

0 1 2 3 4 46 47 48 49 50 5

51-multiframe

6 7 8 9

System Information Type 1 Mapping

Cell Channel Description reference frequencies that describes the Cell Allocation

RACH Control Parameters maximum number of retransmission: 1,2,4 or 7

number of time slots to spread transmission: from 3 up to 50

parameter indicating if the cell is barred or not

parameter indicating if the call re-establishment is allowed or not

parameter indicating if the emergency calls are allowed or not

access classes control

L2 Pseudo Length

21 bytes

SYS INFO 1 Rest Octets there are only spare bits reserved for new information in later phases

System Information Type 1 Description

23 info bytes


24 bits

Neighbor cell BCCH Frequency List

Message Type

Skip Indicator


L2 Pseudo Length

4

bit

s

4

bit

s

8

bit

s

8

bit

s

128 bits

NCC Permitted

8

bit

s

0 1 2 3 4 46 47 48 49 50 5

B C C H

51-multiframe

6 7 8 9


Neighbor Cell Description

list of the BCCH carriers to be monitored by the MS for cell reselection

EXT_IND: parameter (1 bit) indicating if the information element carries the complete BA list or not

BA_IND: parameter (1 bit) enabling the network to discriminate if the measurements sent by the MS have been performed according to BA(BCCH) or to the BA(SACCH).

L2 Pseudo Length

22 bytes

NCC Permitted

definition of the allowed NCCs on the BCCH carriers to be reported by the mobile station in the cell.




24 bits

Neighbor cell Extended BCCH Frequency List

Message Type

Skip Indicator


L2 Pseudo Length

4

bit

s

4

bit

s

8

bit

s

8

bit

s

128 bits

SYS INFO 2bis Rest Octets

8

bit

s

B C C H

0 1 2 3 4 46 47 48 49 50 5

51-multiframe

6 7 8 9

23 info bytes

System Information Type 2bis Mapping

32 bits

Neighbor cell Extended BCCH Frequency List 2

Message Type

Skip Indicator


L2 Pseudo Length

4

bit

s

4

bit

s

8

bit

s

8

bit

s

128 bits

SYS INFO 2ter Rest Octets

0 1 2 3 4 46 47 48 49 50 5

B C C H

51-multiframe

6 7 8 9

23 info bytes

System Information Type 2ter Mapping

Neighbor Cell Description 2

list of the BCCH carriers to be monitored,

parameter indicating the number of cells to be reported of each band in multiband operation,

parameter indicating if the network is allowed or not to discriminate measurements reports sent by the MS.

L2 Pseudo Length

18 bytes

SYS INFO 2ter Rest Octets there are only spare bits reserved for new information in later phases

System Information Type 2ter Description

32

bit

s

LAI

Message Type

Skip Indicator


L2 Pseudo Length

4

bit

s

4

bit

s

8

bit

s

8

bit

s

40

bit

s


0 1 2 3 4 46 47 48 49 50 5

B C C H

51-multiframe

6 7 8 9

Cell Identity

Control Channel Description

Cell Options

Cell selection Parameters


8

bit

s

16

b

its

16

b

its

24

b

its

24

b

its

23 info bytes


Cell Options (BCCH)

- Uplink power control indicator

- DTX indicator (uplink)

- radio link timeout

Control Channel Description

- allows IMSI procedures in the cell

- number of blocks reserved for access grant

- configuration of physical channels used for CCCH

- transmission period of PAGING REQUEST messages

- timeout value for periodic updating

Location Area Identification

- mobile country code

- mobile network code

- location area code

Cell Identity

identification of a cell within a location area

L2 Pseudo Length

18 bytes

System Information Type 3 Description (1/2)

Cell Selection Parameters

- cellReselectHysteresis - maximum TX power level (msTxPwrMaxCCH)

- minimum received signal level (rxLevAccessMin)

- half rate support (NECI)


- additional reselection parameters indicator: CellReselInd - optional (re)selection parameters: w cellBarQualify w cellReselectOffset w temporaryOffset w penaltyTime

- optional power offset

- SYS INFO 2ter indicator

- early classmark sending control

System Information Type 3 Description (2/2)

23 info bytes

LAI

Message Type

Skip Indicator


L2 Pseudo Length

4

bit

s

4

bit

s

8

bit

s

8

bit

s

40 bits


0 1 2 3 4 46 47 48 49 50 5

B C C H

6 7 8 9

Cell Selection Parameters


16 bits 24 bits

CBCH Channel Description

optional

24 to 48 bits 0 to 80 bits 0 or 32 bits

CBCH Mobile Allocation

51-multiframe



- optional (re)selection parameters: w cellReselInd w cellBarQualify w cellReselectOffset w temporaryOffset w penaltyTime

- optional power offset

CBCH Mobile Allocation

definition of the MS frequencies list from the cell allocation frequencies list in the SYS INFO Type 1 message

CBCH Channel Description

- channel type and TDMA offset

- timeslot number

- training sequence code

- frequency hopping indicator

If frequency hopping is in use:

- Mobile Allocation Index Offset

- Hopping Sequence Number

Else:

- Absolute RF Channel Number


Neighbor cell BCCH Frequency List Message Type

Skip Indicator


4

bit

s

4

bit

s

8

bit

s

128 bits

SACCH

0 1 2 23 24 25 10 11 12 9 13 14 15

18 info bytes

26-multiframe


Neighbor cell Extended BCCH Frequency List

Message Type

Skip Indicator


4

bit

s

4

bit

s

8

bit

s

128 bits

SACCH

0 1 2 23 24 25 10 11 12 9 13 14 15

18 info bytes

26-multiframe

System Information Type 5bis Mapping

Neighbor cell Extended BCCH Frequency List 2

Message Type

Skip Indicator


4

bit

s

4

bit

s

8

bit

s

128 bits

SACCH

0 1 2 23 24 25 10 11 12 9 13 14 15

18 info bytes

26-multiframe

System Information Type 5ter Mapping

LAI

Message Type

Skip Indicator


4

bit

s

4

bit

s

8

bit

s

40 bits

Cell Identity

Cell Options

8

bit

s

16

b

its

NCC Permitted

8

bit

s

SACCH

0 1 2 23 24 25 10 11 12 9 13 14 15

56 bits


18 info bytes

26-multiframe


SYS INFO 7 Rest Octets Message Type

Skip Indicator


L2 Pseudo Length

4

bit

s

4

bit

s

8

bit

s

8

bit

s

160 bits

extension

B C C H

0 1 2 3 4 46 47 48 49 50 5 6 7 8 9

23 info bytes

51-multiframe

System Information Types 7 and 8 Mapping

1- On which logical channel are System Information sent?

2- What is BCCH extended?

3- Which information are contained in the neighboring cells description?

4- Characterize System Information Types 5 to 6

5- Give the general structure of System Information

6- Give the cycle duration for the SI broadcast

Check Your Learning

Mobility Management

MM Specific Procedures

Mobility Management

Network Areas & Location Updates

day 1 session 3

Documents