2 omu010000 gprs network optimization parameters issue2

7/25/2019 2 OMU010000 GPRS Network Optimization Parameters ISSUE2

http://slidepdf.com/reader/full/2-omu010000-gprs-network-optimization-parameters-issue2 1/35



Foreword

The PCU performance parameters are essential to the

GPRS network. Proper setting of such parameters can

improve performance of the packet services.

Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.



Contents

GPRS Cell Parameters

Parameters of Cell Reselection

Performance Parameters





N!

T"#$%

T"#&'

(R)*T+,R*-)

S*C/*-)

P-N

T"#0'




N,T1!R2*!(,

GPRSConfigureNetwork Configur Channel forPaging +dle ode (edicated

ode e PCC3 circuit pagingGs Channel

PPCH PPCHPCCCH

I Yes Yes PCH PCH PACCHOr CCCH

PACCH -

II No No PCH PCH CCCH CCCH

PCH PPCHIII No Yes CCCH CCCH

PCH PCH




T"#$%

T"#$% is used to set the ma4imum duration for the

S to wait for the packet uplink assignment message

PCU

PACKET CHANNEL REQUEST

PACKET UPLINK ASSIGNMENT/

IMMEDIATE ASSIGNMENT COMMAND

PACKET RESOURCE REQUEST

T3168 PACKET UPLINK ASSIGNMENT

Condiction T"#$%recommendation（ms）

/er5 Good 677

Good #777

ad '777




T"#&'

The timer is for the S to wait for TF release after receiving

the last data 8lock.

PCU

PACKET DOWNLINK ACK/NACK（ FAI=1）

Final -C2

T3192 +dentifier

PACKET DOWNLINK ASSIGNMENT

TFI

value （ ms）

500 1000 1500 0 80 120 160 200




(R)*T+,R*-)

The S re9uest keeps the ma4imum value of non:(R) mode.

NonDR! NonDR! DR!

Packet transmission mode Packet idle mode Packet idle mode

DR!TIMERMA! "#$

/alue （ Sencond）

0 1 2 4 8 16 32 64




Packet Signaling Processing

RLC DATA %LOCK

RLC DATA %LOCK "F%I$

PACKET DOWNLINK ACK/NACK（ FAI=1）

T"#&';677ms

Read5 ode

Non (R) mode; <s

(R) mode

(R) mode




S*C/*-)

PCU

C&=! 设 %SC&MA!=1'

RLC DATA %LOCK

T3198 2''(#RLC DATA ACK

C&=!

RLC DATA %LOCKT)(*o+,




S*C/*-)

suose PCU!S"C#"$A%&3

C&=' C&=1 C&=2 C&=3 C&=1- C&=1- C&=1- C&=1-

MS .+*0 UL RLC .o4#

Mo0* 5, C&=' C&=1 C&=2 C&=3 C&=1- C&=1-




P-N

P-N*(,C Set the decrease step length of the N"#7' counter of the S

P-N*+NC Set the increase step length of the N"#7' counter of the S

P-N*-) Set the ma4imum value of the N"#7' counter of the S

P4*, U7)n4 A4/N4 N31'2 PANDEC

PANINCPANMA!

A.no0( R**#*

P*0o0( C* R*#**,)on

T3182 T3182

T3182 T3182 T3182




P-N

PCU

RLC DATA %LOCK 设 PANINC=2

PACKET DATA ACK

N31'22

RLC DATA %LOCK 设 PANDEC=1

T3182PACKET DATA ACK

N31'2 1

T)(*o+,




T"#0'

'AI("IN)ICA(ION

PCU

PACKET CHANNEL REQUEST

PACKET ACCESS REECTP:#* I

T31;2PACKET CHANNEL REQUEST

PACKET RESOURCE REQUEST

PACKET ACCESS REECTP:#* II

T31;2PACKET RESOURCE REQUEST




Compare with GS

GPRS GS$

T"#$% S

P-N R=T>S-CC3 ul:frame?

T"#0' T"#''




Contents







N,T1!R2*C!NTR!=*!R(,R

1hether theCell Selection

(escription S send the S modeode

.RNormal S Control Read5 @ Controlled 85

NC7 Noode Stand85 S

S Control with .R Controlled 85NC# Aes !nl5 Read5

ode S

Network Control Controlled 85

NC' Aes !nl5 Read5ode network




NC' Feature

N*)<:.o0

* %change to cell C

N*)<:.o0

*

S*0)n<* A




GPRS Cell Selection

+f no PCC3 channel e4istsB the cell reselection of GPRS is

8asicall5 the same as GS cell reselectionB onl5 two

situations are different.

when the S on the stand85 mode Bif it occur the cell

reselection to the other route area cell NC'DSC'ECR3

when the S on the read5 mode Bif it occur the cellreselection NC'DSC'ECR3




GPRS Cell Change on Stand85 ode

NC2 * SC2+CRH

RA 1 RA 2CC2>%C2 ＋CRH

AC2>%C2C* %

C* CC* A




GPRS Cell Change on Read5 ode

NC2 * SC2+CRH

RA 1%C2>AC2 ＋CRH

C* A C* %




N-CC

/alue Range AesB No

(escription This parameter indicates whether the cell supports the Network

-ssisted Cell Change >N-CC? function. The N-CC function means

that the network notifies the S >in the packet transmission state?

of the s5stem information a8out the neigh8oring cells in advance in

NC7B NC#B or NC' network control mode. Thus the cell reselection

of the S is 9uickened. The SC pla5s a minor role in the N-CC

function. +t sends the s5stem information a8out the cell and the

information a8out the neigh8oring cells to the PCU instead of

participating in the N-CC processing.

Remarks Set this parameter to Aes onl5 when the cell supports GPRS services.

This parameter re9uires the support of licenses.




N-CC

S5stem informationof cell

C* %C* A




Contents







R-C

Route -rea Code

LA

RA RA

RAI = MCCMNCLACRAC

1hen R-C and =-+ appear concurrentl5B the R-C is uni9ue

1hen C+ and =-+ or R-+ appear concurrentl5B the C+ is uni9ue




R-C

Route -rea Update

1hen an S to which the GPRS is attached discovers that it

gets into a new routing area

-fter timeout of the periodical Routing -rea >R-? timer T""#'




T""#'

SGSNRA1

RA2

Ro+,)n<A0*+75,*0*?+*#,

Rea, or Sta.,/I.lu,.

(3312

Ro+,)n<A0*+75,**7,

Ro+,)n<A0*+75,*o(7*,*




GPRS Coding Scheme

- configuration command that sets the GPRS coding scheme of a cell

UpFi4Cs eaning fi4ed CS t5pe of the uplink

/alue range cs#B cs'B cs"B cs<B unfi4ed

,4planation fi4ed CS t5pe of the uplink. To adopt the fi4ed CS t5pe of the

uplinkB set this parameter to CS:#B CS:'B CS:"B or CS:<. To d5namicall5

adust the CS t5pe of the uplinkB set this parameter to unfi4ed. (efault

value unfi4ed

Up(efaultCs eaning default CS t5pe of the uplink

/alue range cs#B cs'B cs"B cs<

,4planation default CS t5pe of the uplink. To d5namicall5 adust the CS

t5pe of the uplinkB set the CS t5pe for transmitting the first TF through this

parameter. ThenB the CS t5pes of other TFs are d5namicall5 adusted

8ased on the signal transmission 9ualit5. (efault value cs#




GPRS Coding Scheme

UpThdCsUpGrade# eaning retransmission rate threshold for the uplink TF to

change from CS:# to CS:'

/alue range 7:$<

,4planation 1hen the retransmission rate of the uplink TF is

smaller than or e9ual to the value of this parameterB the code

scheme of the uplink TF changes from CS:# to CS:'. (efault

value 6

(n(efaultCs eaning default CS t5pe of the downlink

/alue range cs#B cs'B cs"B cs<

To d5namicall5 adust the CS t5pe of the downlinkB set the CS t5pe for

transmitting the first TF through this parameter. ThenB the CS t5pes of

other TFs are d5namicall5 adusted 8ased on the signal transmission

9ualit5.

(efault value cs'




P(C3 Channel Parameters

Uplink ultiple4 /alue range #7:07

Threshold of (5namic ,4planation Uplink multiple4 threshold of d5namic channel

Channel Conversionconversion. 1hen the num8er of su8scri8ers reaches this

thresholdB the d5namic channels are used. +f this threshold ishighB it is difficult to seie d5namic channels. +f this threshold is

lowB it is eas5 to seie d5namic channels.

(efault value '7

(ownlink ultiple4 /alue range #7:%7

Threshold of (5namic ,4planation (ownlink multiple4 threshold of d5namic channelChannel Conversion conversion

(efault value '7




P(C3 Channel Parameters

P(C3 Uplink /alue range #7:07

ultiple4 Threshold,4planation The ma4imum downlink TFs on one P(C3

channel. +f this threshold is set to a higher valueB the TFs

esta8lished on the P(C3 and the su8scri8ers are moreB

and the uplink 8andwidth for each su8scri8er is lower.

/alue #7 indicates a ma4imum of one TF can 8e

esta8lished on the P(C3.

(efault value 07

P(C3 (ownlink /alue range #7:%7

ultiple4 Threshold,4planation The ma4imum downlink TFs on one P(C3

channel

(efault value %7




N"#7#

N"#7# will 8e increased 85 # ever5 time no uplink data 8lock is received.

The TF will 8e released 85 network if N"#7# reaches the threshold.

S Network

R=C 8lock>with USF valid?

R=C 8lock >with USF valid?

N! R,SP!NS, FR! S

-N"#7#;N"#7#*-)




N"#7"

N"#7" will 8e incremented 85 # ever5 time no H-C2!1N=,(G,,NTI

message is received during TF release.

S Network

P-C2,T UP=+N2 -C2JN-C2>F-+;#?

P-C2,T UP=+N2 -C2JN-C2>F-+;#?

N! R,SP!NS, FR! S

-N"#7";N"#7"*-)


2 omu010000 gprs network optimization parameters issue2

Documents