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Um interface and radio channel
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Contents
Overview
Radio channel
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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$*
Hierarchical Structure of Um
Interface
RACH BCCH ACH/PCH SDCCH SACCH TCH .ACCH
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Physical Layer l1
GSM use TDMA with FDMA as an access method.
Multiple frequencies are used with each frequency
divided in (time) slots. Group of these slots is
laeled as one !frame!. These frames are further
"rouped to form multi#frame$ super#frame$ and
hyper#frame. This frame arran"ement is asephysical structure.
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Radio Access Technology
Time
.DMA
.re%enc'
TDMATime
.re%enc'
CDMA
.re%enc'
Time
Co0e
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Data link Layer l
%&rror#free transmission etween ad'acent entities
%Also mana"es Acs for transmission of the pacets
%Ma'or Timers *++,T*++
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!"T#$R% APPLICATI$!
LA&"R l'
% Radio Resource (anagement )RR*+
% (o,ility (anagement )((* and
% Connection (anagement )C(*-
-
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(o,ility (anagement )((*
/+
#Assumes a reliale 00 connection
#0esponsile for#location mana"ement and#Security
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(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.
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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$and release.
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Connection (anagement )C(*
Supplementary Servicessub layer
. manages the im/lementation of the 0arioussu//lementary ser0ices )Call or2arding32aiting3hold *+ andalso allo2s users to access and modify their ser0ice
su,scri/tion-
Short Message Servicesub layer
. handles the routing and deli0ery of short messages+ ,othfrom and to the mo,ile su,scri,er-
/6
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Contents
Overview
Radio channel
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Broa0cast contro& channe&
)BCCH*Contro& channe&
Common contro& channe&
)CCCH*
oice channe&
)TCH*
.CH SCH BCCH
)s'stem information*
TCH/.ACH RACH SDCCH .ACCH
SACCH
TCH/H
TCH/123.
TCH/ 425.6 H
TCH/ #24.6 H
PCH
Common channe&
)CCH*
De0icate0 channe&
)DCH*
Lo7ica& channe&
Logical Channel Ty/e
% 4S(566 and DCS1766 ha0e the same
logical channel category
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FCCH
SCH
BCCH
PCH
!CH
BCCH
CCCH
Common
Channel
S"CCH
SCCH
FCCH
#CH$F
#CH$H
"CCH
#CH
"edicated
Channel
Do2nlink Logical Channel
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Do2nlink Logical Channel
FCCH
SCH
BCCH
PCH
!CH
BCCH
CCCH
Common
Channel
S"CCH
SCCH
FCCH
#CH$F
#CH$H
"CCH
#CH
"edicated
Channel
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RCH CCCH
Common
channel
S"CCH
SCCHFCCH
#CH$F
#CH$H
"CCH
#CH
"edicated
channel
U/link Logical Channel
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U/link Logical Channel
RCH CCCH
Common
channel
S"CCH
SCCHFCCH
#CH$F
#CH$H
"CCH
#CH
"edicated
channel
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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
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Than ;ou