Um Interface and Radio Channels_9thOct2010

8/12/2019 Um Interface and Radio Channels_9thOct2010

1/21

Um interface and radio channel


2/21

Contents

Overview

Radio channel


3/21


4/21

Communication management (CM)

Communication management (CM)

Radio resources management (RR)

Radio resources management (RR)

Mobility and security management

(MM)

Mobility and security management

(MM)

Integrated management

Integrated management

TCH! TCH" TCH# SACCH TCH#$ IDL

TCH! TCH" TCH# SACCH TCH#$ IDL

M%&tiframePh'sica& &in( &a'er )L"*

Data &in( &a'er )L#*

Net+or( a,,&ication &a'er )L$*

Hierarchical Structure of Um

Interface

RACH BCCH ACH/PCH SDCCH SACCH TCH .ACCH


5/21

Physical Layer l1

GSM use TDMA with FDMA as an access method.

Multiple frequencies are used with each frequency

divided in (time) slots. Group of these slots is

laeled as one !frame!. These frames are further

"rouped to form multi#frame$ super#frame$ and

hyper#frame. This frame arran"ement is asephysical structure.


6/21

Radio Access Technology

Time

.DMA

.re%enc'

TDMATime

.re%enc'

CDMA

.re%enc'

Time

Co0e


7/21

Data link Layer l

%&rror#free transmission etween ad'acent entities

%Also mana"es Acs for transmission of the pacets

%Ma'or Timers *++,T*++


8/21

!"T#$R% APPLICATI$!

LA&"R l'

% Radio Resource (anagement )RR*+

% (o,ility (anagement )((* and

% Connection (anagement )C(*-

-


9/21


10/21

(o,ility (anagement )((*

/+

#Assumes a reliale 00 connection

#0esponsile for#location mana"ement and#Security


11/21

(o,ility (anagement )((*

//

#Location managementinvolves the procedures andsi"nalin" for location updating$ so that the moile1s current

location is stored at the 230$ allowin" incomin" calls to

e properly routed.

#Security involves the authenticationof the moile$ to preventunauthori4ed access to the networ$ as well as the encryptionof

all radio lin traffic.


12/21

Connection (anagement )C(*

/*

The 5M functional layer is divided into three su

layers.

# 5all 5ontrol (55)

# Supplementary Services # Short Messa"e Service

Call Control (CC) sub layer

# mana"es call routin"$ estalishment$ maintenance$and release.


13/21

Connection (anagement )C(*

Supplementary Servicessub layer

. manages the im/lementation of the 0arioussu//lementary ser0ices )Call or2arding32aiting3hold *+ andalso allo2s users to access and modify their ser0ice

su,scri/tion-

Short Message Servicesub layer

. handles the routing and deli0ery of short messages+ ,othfrom and to the mo,ile su,scri,er-

/6


14/21

Contents

Overview

Radio channel


15/21

Broa0cast contro& channe&

)BCCH*Contro& channe&

Common contro& channe&

)CCCH*

oice channe&

)TCH*

.CH SCH BCCH

)s'stem information*

TCH/.ACH RACH SDCCH .ACCH

SACCH

TCH/H

TCH/123.

TCH/ 425.6 H

TCH/ #24.6 H

PCH

Common channe&

)CCH*

De0icate0 channe&

)DCH*

Lo7ica& channe&

Logical Channel Ty/e

% 4S(566 and DCS1766 ha0e the same

logical channel category


16/21

FCCH

SCH

BCCH

PCH

!CH

BCCH

CCCH

Common

Channel

S"CCH

SCCH

FCCH

#CH$F

#CH$H

"CCH

#CH

"edicated

Channel

Do2nlink Logical Channel


17/21

Do2nlink Logical Channel

FCCH

SCH

BCCH

PCH

!CH

BCCH

CCCH

Common

Channel

S"CCH

SCCH

FCCH

#CH$F

#CH$H

"CCH

#CH

"edicated

Channel


18/21

RCH CCCH

Common

channel

S"CCH

SCCHFCCH

#CH$F

#CH$H

"CCH

#CH

"edicated

channel

U/link Logical Channel


19/21

U/link Logical Channel

RCH CCCH

Common

channel

S"CCH

SCCHFCCH

#CH$F

#CH$H

"CCH

#CH

"edicated

channel


20/21

Use of Logical Channels

Search for fre8uency correction ,urst

Search for synchroni9ation se8uence

Read system information

Listen /aging message

Send access ,urst

#ait for signaling channel allocation

Call setu/

Assign traffic channel

Con0ersation

Call release

F552

S52

7552

852

0A52

AG52

SD552

SD552

T52

FA552

idle mode

9off: state

dedicated

mode

idle mode


21/21

Than ;ou

Um Interface and Radio Channels_9thOct2010

Documents

Transcript of Um Interface and Radio Channels_9thOct2010