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Copyright 2011 Huawei Technologies Co., Ltd. All rights reserved.
GSM Radio ChannelAllocation Algorithm and
Parameters
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Foreword
Many kinds of advanced radio resource managementalgorithms are designed and adopted including !"##
C! allocation algorithm in order to improve the
performance of network in di$erent environments
and scenarios.
Page
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%&'ectives
(pon completion of this course you will &e a&le to) Master the main idea of !"## Channel Assignment
Algorithm
Master the parameters of !"## Channel AssignmentAlgorithm
Page!
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Contents
*. !" ## Channel Assignment Algorithm +asic
,. Channel Assignment Priorities and -ata
Conguration
Page"
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Contents
*. !" ## Channel Assignment Algorithm +asic
*.* Channel Assignment Procedure
*., Channel Assignment Strategies
*./ -etail Priorities of Channel Assignment Strategies
Page#
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Channel Assignment Procedure
Page$
TRX:0mainBCCH
SDCCH
TCH
SDCCH
TCH
TCH
TCH
TCH
TRX:1SDCCH
TCH
TCH
TCH
TCH
TCH
TCH
TCH
TRX:2TCH
TCH
TCH
TCH
TCH
TCH
TCH
TCH
TRX:3TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
RACH0 Channel Re1uest2Reason3M%C Random Ref.4
AGCH0#mmediate Assi
gnment2Re1uest Ref. S-CC! 5o.4
SDCCH0 CM Service Re1uest2CC C6S54
SDCCH Assignment decision
TCH Assignment decision
SDCCH0 Assignment CM-27C! 5o.4
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Processing of Channel Assignment
Page%
Preprocessing of
Channel Assignment
Yes
Immediate Assignment
Request on RACH
Assignment Request
For TCH on SDCCH
Incoming
Handoer
Hua!ei II Channel Assignment Algorithm
High" #edium and $o! Priorit%
Channel Assignment
Successful&
Postprocessing of
Channel Assignment
'(D
(o
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Channel Assignment Strategies
!" ## channel assignment algorithm is &ased on a rankedselection.
7he following is a default priority0se1uence which can &e
set &y data conguration.
8ach channel9s overall priority is computed. 7he availa&le
channel with highest overall priority2lowest value4 will &e
assigned.
Page&
High Priority
Capability
Priorities
Quality
Priorities
PS Coordination
Priorities
Management
Priorities
Low Priority
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-ata Conguration of Channel AllocateStrategy
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-etail Priorities of Channel AssignmentStrategies
Page12
High Priority
Capacity
Priorities
Quality
Priorities
PS Coordination
Priorities
Management
Priorities
Low Priority
PDCH distance priorit%
PDCH num)er priorit%
TS priorit%
Intelligent Po!er
Consumption Priorit%
TR* priorit%
Po!er priorit%
Po!er+saing TR*
priorit%
Histor% record priorit%
Interference Priorit%
Fle, A)is priorit%
A#R priorit%
Different
TR*-.and-TS-#A
priorit%
Channel rate priorit%
Channel rate ad/ustment
priorit%
Frequenc% )and priorit%
I01 priorit%
TR* po!er amplifier
priorit%
main .CCH TR* priorit%
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+it Structures of Channel AssignmentStrategies
Page1
Capacity priorities
S coordination priorities
RSVD
316
PDNM
53
PDIS
20
RSVD
3117
TRX
116
TS
20
!anagement priorities
PA
53
PWR
1512
ICB
16
"#a$ity priorities
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Contents
*. !" ## Channel Assignment Algorithm +asic
,. ChannelAssignment Priorities and -ata
Conguration
Page1!
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Contents
,. Channel Assignment Priorities and -ataConguration
,.* Capacity Priorities and -ata Conguration
,.,
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Radio Resource Management 0Capacity Priorities
Page1#
High Priority
Capacity
Priorities
Quality
Priorities
PS Coordination
Priorities
Management
Priorities
Low Priority
PDCH distance priorit%
PDCH num)er priorit%
TS priorit%
Intelligent Po!er
Consumption Priorit%TR* priorit%
Po!er priorit%
Po!er+saing TR*
priorit%
Histor% record priorit%
Interference Priorit%
Fle, A)is priorit%
A#R priorit%
Different
TR*-.and-TS-#A
priorit%
Channel rate priorit%
Channel rate ad/ustment
priorit%Frequenc% )and priorit%
I01 priorit%
TR* po!er amplifier
priorit%
main .CCH TR* priorit%
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Radio Resource Management 0 CapacityPriorities
Page1$
it Code !ame Con"guration Rule
: P-C!-ynamic P-C! Set to * for dynamic P-C! channel.
%therwise set to :.
*0? R7
Channe
l Rate
Priority
7he highest &it of Rate
priority +it ?thSet to :.
Group call 7C!!
preferentially +it ,nd
Set to :. only when the current channel issingle and its tra@c type is inconsistent it isset to *.
Matching &etween 7C!rate type and call
re1uirement2&it /th and&it *st4
7C!F only orpreferentially
7C!! only orpreferentially
Single ** ::Couple *: :*
#dle 7C!F :: *:
C78 Channel rate ad'ustment priority#f =#CH Rate Ad$ust Allo%> is set to Bes thepriority value is set to * otherwise it is set to:.
CallRequirement
TCH Rate T%pe
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TCH/H
TRX:0BCCH
SDCCH
TCH
SDCCH
TCH
TCH
TCH
TCH
TRX:1SDCCH
TCH
TCH
TCH
TCH/H
TCH
TCH
TRX:2TCH
TCH
TCH/H
TCHTCH/H
TCH
TCH
TCH
TRX:3TCH/H
TCH/H
TCH/H
TCH/HTCH/H
TCH/H
TCH/H
TCH/H
Re%#est &R
TCH/& ' TCH/H 2 id$e ' TCH/H 1 id$e
Re%#est HR
TCH/H 1 id$e ' TCH/H 2 id$e ' TCH/&
Capacity Priorities 0 Channel RatePriority
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Capacity Priorities 0 Channel RatePriority
7he +SC preferentially assigns a halfDrate channel ifany of the following conditions is met
Page1&
Ater (nter)aceAter(nter)ace A*is (nter)aceA*is(nter)ace +m (nter)ace+m(nter)ace
1nl% !hen ,A*is
Reso#rce
Ad-#stment TCHH
nction S.itcis
set toesand the
load of A)is interfacereach certain
threshold
1nl% !hen ,HR
A$$ocation &$ag
is set to pen
and Ater resource
is congested
(on A#R2 load 3
,TCH Tra))ic B#sy
Treso$d45
A#R2,A!R TCH/H
rior A$$o.ed is
set to6 and load3,TCH/H rior Ce$$
7oad Treso$d
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-ata Conguration of Channel RatePriority
Preferentially assigning halfDrate channels &ased onthe Ater resource status
Page20
4
4
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-ata Conguration of Channel RatePriority Preferentially assigning halfDrate channels &ased on
the Abisresource status.
Page21
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-ata Conguration of Channel RatePriority
Preferentially assigning halfDrate channels &ased on the&mresource status
Page22
4
4
5alue Rang2 67889
5alue Rang2 67:669
&or
A!R
&or
6on8A!R
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-ata Conguration of Channel RatePriority
Preferentially assigning halfDrate channels &ased on the&mresource status
Page2!
5alue Rang2 67:669 5alue Rang2 67:669
&or (+
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Capacity Priorities 0 Channel RateAd'ustment Priority
Page2"
TRX:9TCH/&
TCH/&
TCH/&TCH/&
TCH/&
TCH/&
TCH/H
TCH/H
TRX:0mainBCCH
SDCCH
TCH/&TCH/H
TCH/H
TCH/&
TCH/&
TCH/&
TRX:1SDCCH
SDCCH
TCH/&TCH/&
TCH/&
TCH/H
TCH/H
TCH/H
TRX:2SDCCH
TCH/H
TCH/HTCH/H
TCH/H
TCH/H
TCH/H
TCH/H
;S!
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-ata Conguration of Channel RateAd'ustment
Page2#
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Radio Resource Management 0 CapacityPriorities
Page2$
it Code !ame Con"guration Rule
E -CS -CS*:: priority
#f the channel &elongs to' the priority value is set to* otherwise it is set to :.
'is -CS*:: or PCS*:: or GSM?: or GSM?:
or GSM: or GSM0R or GSM08 or GSM0P.
H PCS PCS*:: priority
?: GSM?: priority
?: GSM?: priority
*: : GSM: priority
** R GSM0R priority
*, 8 GSM08 priority
*/ P GSM0P priority
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7RI Capa&ility of Fre1uency +and
and P0GSM 80GSM R0GSM GSM: GSM?: GSM?: PCS*:
:
-CS*:
:
it-!o () (* (( (+ , . /
DCS(++ #R' + + + + + + + (
P-,++ #R' ( + + + + + + +
Page2%
1uter Cell
;S# P+866Inner cell
DCS :
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Fre1uency Resource of GSMSystem
0requencySpectrum
Range1MH23
&plin40requency 5alue
AR0C! Do%nlin40requency5alue
PDGSM:::J*
/JE:Fu2n43:K:.,n *Ln L *,? Fd2n43Fu2n4K?
8DGSM::
:J*
,JE:
Fu2n43:K:.,n
Fu2n43:K:.,2nD
*:,?4
: L n L *,?
H L n L *:,/ Fd2n43Fu2n4K?
RDGSM::
HEJ*
,*JE:
Fu2n43:K:.,n
Fu2n43:K:.,2nD
*:,?4
: L n L *,?
L n L *:,/Fd2n43Fu2n4K?
-CS*:: *H*:J*H
*:J*:
Fu2n43*H*:.,K:.,2nD*,4
*, L n L Fd2n43Fu2n4K
PCS*::*:J**:
*/:J*:
Fu2n43*:.,K:.,2nD
*,4*, L n L *: Fd2n43Fu2n4K:
Page2&
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Radio Resource Management 0 CapacityPriorities
Page1
it Code !ame Con"guration Rule
*? -(P6&7-ual0use
priority
#his priority is used %hen the dynamic P#algorithm isenabled8#f the channel can either form a channel group or &e used as anindependentchannel the priority value is set to * otherwise the priority valueis set to :.
* C!G 6&7channelgroup priority
#his priority is used %hen the dynamic P#algorithm isenabled8#f the preferred su&cell of the call is a middle su&cell or an underlaid
su&cell and the channel can form a channel group the priorityvalue is set to :. #f the preferred su&cell of the call is an overlaidsu&cell and the channel cannot form a channel group the priorityvalue is also set to :. #n other cases the priority value is set to *.
*E S+C6&7su&cell
priority
#his priority is used in channel assignment in a concentriccell8#f the su&cell on which the channel is located is 'ust the preferredsu&cell of the call or is not a concentric su&cell the priority value is
set to : otherwise it is set to *.
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P+7
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P+7
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Dynamic P#
+etter Signal "orseSignal
7ime
7RI 5um&er
7RI 5um&er7ime
+etter Signal"orseSignal
+eyond cellcoverage
+eyond cellcoverage
Signal
Signal
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-ata Conguration of -ynamicP+7
Step*) Cell conguration and maintenanceDchannelmanagement parameter conguration
Page#
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-ata Conguration of -ynamicP+7
Step,) +7S conguration and maintenanceD7RIconguration
Page$
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Capacity Priorities 0 #(% Su&cell Priority
Feature is initiated at any channel change 2immediate
assignment or assignment4 when cell is in fact concentric.
3; For a MS in the inner cell the channels 2S-CC! or 7C!4 of
the inner cell have priority and vice versa
Page%
1uter
CellInner cell
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Radio Resource Management 0 CapacityPriorities
Page&
it Code !ame Con"guration Rule
*H0
*7P%
7RI power
amplier
priority
#hispriority isused inintelligentpo%erconsumption decrease
::) indicating that the 7RI power amplier isoperational
:*) indicating that the +7S receives the startupresponse and waits for conrmation of the startupstatus
*:) indicating that the +7S waits for a startupresponse
**) indicating that the 7RI power amplier is shutdown
* +7RIMain +CC!
7RI priority
#his priority is used %hen the tight CCH algorithm isenabled8#f the tight +CC! fre1uency reuse algorithm is used and the channelis on the main +CC! 7RI the priority value is set to * otherwisethe priority value is set to :. #f the tight +CC! fre1uency reusealgorithm is not used the priority value is always set to :.
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-ata Conguration of +7RI Priority
Page!0
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Radio Resource Management 0Capacity Priorities
Page!1
it CodeCon"guration Rule
,:0,
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Radio Resource Management 0Capacity Priorities
Page!2
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Radio Resource Management 0
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Radio Resource Management 0
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-ataConguration of !istory RecordPriority
Page!#
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Radio Resource Management 0
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-ataConguration of #ntereferencePriority
Page!&
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-ata Conguration of FleN A&is Priority
Page"0
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Radio Resource Management 0
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-ataConguration of AMR Priority
Speech version
Page"2
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-ataConguration of AMR Priority
Fre1uency reuse mode
Page"
4
4
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Radio Resource Management 0
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#ntroduction to #+CA
6nterference ased Channel Allocation is a dynamicresource allocation algorithm.
C#R estimation is the &asis of #+CA. And the
precondition is the calculation of path loss &etween
MS and all of the corresponding cells.
+ased on estimated C#R of new call and the inuence
to the eNist call the system will choose a &est
channel for MS.
Page""
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#mplementation of #+CA
Step*) 8stimate the interference signal strength
Page "$
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#mplementation of #+CA
Step,) calculate C#R of a new call to &e esta&lished
Page "%
2:*H4
2MA#%C#R4
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#mplementation of #+CA
Step/) calculate the C#R of each esta&lished call C#RQ-8C3C#RQoldDC#RQnew
"here C#RQ-8CD;decrease in C#R C#RQoldD;C#R of the
esta&lished call &efore the new call is esta&lished
C#RQnewD;C#R of the esta&lished call after the new call is
esta&lished.
Page "&
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#mplementation of #+CA
Step/) calculate the C#R of each esta&lished call
Page #0
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Step ?) calculate the CR8S CR8S3E/DC#RQnewKMAIC#RQ-8Ci
C#RQnew is the C#R for new. C#RQ-8Ci is the decrease in
the C#R of each esta&lished call due to the esta&lishment
of the new call.
7he MA#% corresponding to the minimum CR8S is
selected as the candidate MA#% for the timeslot to &e
assigned.
Page #1
#mplementation of #+CA
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#mplementation of #+CA
Step ?) calculate the CR8S
Page#2
2:*H4
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#mplementation of #+CA
Step) interference &ased channel allocation
Page #
2:*H4
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-ata Conguration
Page#!
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Radio Resource Management 0
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Radio Resource Management 0 PSCoordination Priorities
Page#%
High Priority
Capacity
Priorities
Quality
Priorities
PS Coordination
Priorities
Management
Priorities
Low Priority
PDCH distance priorit%
PDCH num)er priorit%
TS priorit%
Intelligent Po!er
Consumption Priorit%
TR* priorit%
Po!er priorit%
Po!er+saing TR*
priorit%
Histor% record priorit%
Interference Priorit%
Fle, A)is priorit%
A#R priorit%
Different
TR*-.and-TS-#A
priorit%
Channel rate priorit%
Channel rate ad/ustment
priorit%
Frequenc% )and priorit%
I01 priorit%
TR* po!er amplifier
priorit%
main .CCH TR* priorit%
R di R M PS
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Radio Resource Management 0 PSCoordination Priorities
Page#&
S coordination prioritiesRSVD
316
PDNM
53
PDI
20
it Code !ame Con"guration Rule
:0, P-#SP-C! distance
priority
7he minimum distance to P-C!. 7he channel thatis the farthest from the P-C! timeslot ispreferentially assigned to the CS service. 7hat is tosay the closer the distance the lower the priority.
/0P-5
M
P-C! num&er
priority
7he num&er of P-C! in the same 7RI. 7he channelon the 7RI with less P-C!s should &epreferentially assigned to the CS services.
PS C di ti P i iti P-C! P i i
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PS Coordination Priorities 0 P-C! Priori
Page$0
TRX:0BCCH
SDCCH
TCH
TCH
DCH
DCH
DCH
DCH
high
lo!
TRX:0BCCH
SDCCH
TCH
SDCCHDCH
DCH
DCH
DCH
TRX:1SDCCH
TCH
TCH
TCHTCH
DCH
DCH
DCH
PDCH (um)er Priorit%PDCH Distance Priorit%
R di R M t
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Radio Resource Management 0Management Priorities
Page$1
High Priority
Capacity
Priorities
Quality
Priorities
PS Coordination
Priorities
Management
Priorities
Low Priority
PDCH distance priorit%
PDCH num)er priorit%
TS priorit%
Intelligent Po!er
Consumption Priorit%
TR* priorit%
Po!er priorit%
Po!er+saing TR*
priorit%
Histor% record priorit%
Interference Priorit%
Fle, A)is priorit%
A#R priorit%
Different
TR*-.and-TS-#A
priorit%
Channel rate priorit%
Channel rate ad/ustment
priorit%
Frequenc% )and priorit%
I01 priorit%
TR* po!er amplifier
priorit%
main .CCH TR* priorit%
R di R M t
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Radio Resource Management 0Management Priorities
Page$2
!anagement priorities
RSVD
3117
T X
116
T
20
PA
53
PWR
1512
ICB
16
it Code !ame Con"guration Rule
:0, 7S 7S priority+ased on =7RI Attri&utes0Channel Attri&utes07imeSlot Priority> conguration parameter 2valuerang) :JH4.
/0 PA
#ntelligentPower
ConsumptionPriority
According to the =7RI Attri&utes0-eviceAttri&utes0 Priority of Shut -own 7RI>
Conguration parameter> 2value range):JH4.
E0** 7RI 7RI priority+ased on =7RI Attri&utes0-evice Attri&utes07RIPriority> conguration parameter 2value rang):JH4.
-ata Conguration of 7S and PA
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-ata Conguration of 7S and PAPriorities
Page$
5alue Rang2 67
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-ata Conguration of 7RI Priority
Page$!
Radio Resource Management
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Radio Resource Management 0Management Priorities
Page$"
!anagement priorities
RSVD
3117
TRX
116
TS
20
PA
53
PW
1512
ICB
16
it Code !ame Con"guration Rule
*,0
*P"R Power priority
7his &it is ena&led only when MM =Cellconguration and maintenanceDcell networkoptimiOation parameter congurationDchannelmanagement parameter congurationDS87 GC8C!MGA-DPower Priority Allowed > is Bes
*E #C+
intelligent
com&iner&ypasspriority
#f +CC! carrier is in -7R( -RR( or -RF( foranother carrier who is in the same cell with this+CC! carrier not attend &ase&and hopping and=#C+ Allowed> in this cell is yes all channel ofwhich is set * otherwise :.
Management Priorities 0 #ntelligent Power
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Management Priorities #ntelligent PowerConsumption Principle
A 7RI running at normal power has higher
priority for assignment than low power ones. As a
result of that prioritiOation a no power 7RI can &e
powered down.
Page$#
TRX:0mainBCCH
SDCCH
TCH
SDCCH
TCH
TCH
TCH
TCH
TRX:1SDCCH
TCH
TCH
TCH
TCH
TCH
TCH
TCH
TRX:3TCH
TCH
TCH
TCH
TCH
TCH
TCH
TCH
TRX:2TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
TCH/H
Hig o.er 7o. o.er
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-ata Conguration of P"R Priority
Page$$
44
44
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-ata Conguration of #C+ Priority
Page$%
44
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Summary
#n this course we have learned !" ## channel assignment algorithm principle
!" ## channel assignment algorithm data conguration
Application should &e rollout &ased on realenvironment.
Page$&
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Than %ou!!!Ehua!eiEcom