www.huawei.com
Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Parameters of GPRS Network Optimization
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page1Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Foreword
� The PCU performance parameters are essential to the
GPRS network. Proper setting of such parameters can
improve performance of the packet services.
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page2Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
� GPRS Cell Parameters
�� Parameters of Cell ReselectionParameters of Cell Reselection
�� Performance ParametersPerformance Parameters
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page3Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Cell Parameters� NMO
� T3168
� T3192
� DRX_TIMER_MAX
� ACCESS_BURST_TYPE
� CONTROL_ACK_TYPE
� BS_CV_MAX
� PAN
� T3172
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page4Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
NETWORK_MODE
PCHPCHCCCHCCCH
PPCHPCHYesNoIII
CCCHCCCHPCHPCHNoNoII
-PACCH
PCHPCH PACCHPCCCH
Or CCCH
PPCHPPCH
YesYesI
DedicatedIdle ModeGPRS Paging
Channel
Channel for circuit paging
Configure PCCH
Configure
GsNetwork
Mode
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page5Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
T3168
T3168 is used to set the maximum duration for the
MS to wait for the packet uplink assignment message
PCU
PACKET CHANNEL REQUEST
PACKET UPLINK ASSIGNMENT/ IMMEDIATE ASSIGNMENT COMMAND
PACKET RESOURCE REQUEST
2000Bad
1000Good
500Very Good
T3168 recommendation(ms)Condiction
T3168 PACKET UPLINK ASSIGNMENT
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page6Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
T3192
The timer is for the MS to wait for TBF release after receiving
the last data block.
PCU
T3192
PACKET DOWNLINK ACK/NACK (FAI=1)
PACKET DOWNLINK ASSIGNMENT
TFI
Final ACKIdentifier
20016012080015001000500value(ms)
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page7Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
DRX_TIMER_MAX
The MS request keeps the maximum value of non-DRX mode.
Packet transmission mode
Non_DRX DRX
Packet idle mode
Non_DRX
DRX_TIMER_MAX (s)
64321684210Value(Sencond)
Packet idle mode
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page8Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Packet Signaling Processing
PACKET DOWNLINK ACK/NACK (FAI=1)
RLC DATA BLOCK (FBI)
RLC DATA BLOCK
T3192=500ms
Non DRX mode= 4s
DRX mode
DRX mode
Ready Mode
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page9Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
ACCESS_BURST_TYPE
MS uses 8bit format or 11bit format in the following three types
of messages
� PACKET CHANNEL REQUEST
� PTCCH UPLINK BLOCK
� PACKET CONTROL ACKNOWLEDGMENT
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page10Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BS_CV_MAX
PCU
T3198
RLC DATA BLOCK
CV=X
RLC DATA ACK
RLC DATA BLOCK
CV=X
Timeout
设BS_CV_MAX=10
200ms
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page11Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BS_CV_MAX
PCU
MS buffer – UL RLC blocks
CV=0 CV=1 CV=2 CV=3 CV=15 CV=15 CV=15 CV=15
CV=0 CV=1 CV=2More data CV=3 CV=15 CV=15
suppose suppose suppose suppose BBBBS_CV_MAX=3S_CV_MAX=3S_CV_MAX=3S_CV_MAX=3
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page12Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PAN
� PAN_DEC Set the decrease step length of the N3102 counter of the MS
� PAN_INC Set the increase step length of the N3102 counter of the MS
� PAN_MAX Set the maximum value of the N3102 counter of the MS
Packet Uplink Ack/NackN3102
PAN_MAX
- PAN_DEC
+ PAN_INC
Abnormal Release
T3182
T3182
T3182 T3182
T3182
Perform Cell Re-selection
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page13Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PAN
PCU
N3102+2
RLC DATA BLOCK
PACKET DATA ACK
Timeout
设PAN_INC=2
RLC DATA BLOCK
PACKET DATA ACKT3182
设PAN_DEC=1
N3102- 1
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page14Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
T3172
WAIT_INDICATIONWAIT_INDICATIONWAIT_INDICATIONWAIT_INDICATION
PCU
T3172
PACKET CHANNEL REQUEST
PACKET ACCESS REJECT
PACKET RESOURCE REQUEST
PACKET ACCESS REJECT
T3172
Phase I
Phase II
PACKET CHANNEL REQUEST
PACKET RESOURCE REQUEST
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page15Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Compare with GSM
T3122T3172
RLT(SACCH Mul-frame)PAN
ST3168
GSMGPRS
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page16Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
� GPRS Cell Parameters
�� Parameters of Cell ReselectionParameters of Cell Reselection
�� Performance ParametersPerformance Parameters
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page17Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
NETWORK_CONTROL_ORDER
Controlled by network
Only ReadyYesNetwork Control Mode
NC2
Controlled by MS
Only ReadyYesMS Control with M.R Mode
NC1
Controlled by MS
Ready & Standby
NoNormal MS Control Mode
NC0
Cell Selection Mode
MS modeWhether the MS send the
M.RDescription
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page18Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
NC2 Feature NC2 Feature
Serving cell A
Neighbor cell B
Neighbor cell c
change to cell C
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page19Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Cell Selection
If no PBCCH channel exists, the cell reselection of GPRS is
basically the same as GSM cell reselection, only two
situations are different.
� when the MS on the standby mode ,if it occur the cell
reselection to the other route area cell : NC2>SC2+CRH
� when the MS on the ready mode ,if it occur the cell
reselection :NC2>SC2+CRH
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page20Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Cell Change on Standby ModeGPRS Cell Change on Standby Mode
NC2 > SC2+CRH
RA 1 RA 2
Cell A
Cell B
Cell C
AC2>BC2 CC2>BC2+CRH
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page21Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Cell Change on Ready ModeGPRS Cell Change on Ready Mode
NC2 > SC2+CRH
BC2>AC2+CRHRA 1
Cell A Cell B
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page22Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
NACC
Set this parameter to Yes only when the cell supports GPRS services.
This parameter requires the support of licenses.
Remarks
This parameter indicates whether the cell supports the Network
Assisted Cell Change (NACC) function. The NACC function means
that the network notifies the MS (in the packet transmission state)
of the system information about the neighboring cells in advance in
NC0, NC1, or NC2 network control mode. Thus the cell reselection
of the MS is quickened. The BSC plays a minor role in the NACC
function. It sends the system information about the cell and the
information about the neighboring cells to the PCU instead of
participating in the NACC processing.
Description
Yes, NoValue Range
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page23Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
NACC
Cell ACell B
System information of cell B
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page24Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
ALPHA & GAMMA� ALPHA
� The ALPHA parameter is used by the MS to calculate the output power value PCH
of its uplink PDCH
� For open loop power control, it should be set to 1.0.
A=0.10A=0.9……A=0.2A=0.1A=0.0ALPHA Value
10101001……001000010000codec
� GAMMA
� Expected receiving signal strength at the BTS side when the MS GPRS dynamic
power control is active
� Value range: 0~62dB, default value is 0
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page25Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
ALPHA & GAMMA� According GPRS principle, GPRS MS output power as below:
Pch = Min〔 Ro - Rch – a*( C+48) , Pmax〕
Pmax: GPRS MS max transmitting power:29dBm
a:ALPHA,normally is 1
Ro:BTS max transmitting power:39dBm
Rch:GAMMA
C:MS receiving level
If there is power control,Ro - Rch – a*( c+48) < Pmax
39-GAMMA -C-48<Pmax
C> -38-GAMMA
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page26Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
ALPHA & GAMMA
So if GAMMA=0,power control will be triggered when the receiving level higher than -38dB. But in the project network, normally receiving level lower than -38dB.
The recommended value is 14,each unit is 2dB,so -38-2X14=-66dB,when the MS receiving level higher than -66dB, power control will be triggered.
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page27Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Contents
� GPRS Cell Parameters
�� Parameters of Cell ReselectionParameters of Cell Reselection
�� Performance ParametersPerformance Parameters
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page28Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
RAC
Route Area Code
� When RAC and LAI appear concurrently, the RAC is unique
� When CI and LAI or RAI appear concurrently, the CI is unique
RAI = MCC+MNC+LAC+RAC
LA
RA RA
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page29Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
RAC
Route Area Update
� When an MS to which the GPRS is attached discovers that it
gets into a new routing area
� After timeout of the periodical Routing Area (RA) timer T3312
� When a “suspended” MS is not “recovered” by network
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page30Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
T3312
Routing_Area_update_request
Routing_Area_update_accept
Routing_Area_update_complete
RA1RA1RA1RA1RA2RA2RA2RA2
SGSN
Ready or StandbyIncluding T3312
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page31Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Coding SchemeA configuration command that sets the GPRS coding scheme of a cell
Meaning: default CS type of the uplink
Value range: cs1, cs2, cs3, cs4
Explanation: default CS type of the uplink. To dynamically adjust the
CS type of the uplink, set the CS type for transmitting the first TBF
through this parameter. Then, the CS types of other TBFs are
dynamically adjusted based on the signal transmission quality. Default
value: cs1
UpDefaultCs
Meaning: fixed CS type of the uplink
Value range: cs1, cs2, cs3, cs4, unfixed
Explanation: fixed CS type of the uplink. To adopt the fixed CS type of
the uplink, set this parameter to CS-1, CS-2, CS-3, or CS-4. To
dynamically adjust the CS type of the uplink, set this parameter to
unfixed. Default value: unfixed
UpFixCs
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page32Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Coding Scheme
Meaning: default CS type of the downlink
Value range: cs1, cs2, cs3, cs4
To dynamically adjust the CS type of the downlink, set the CS type
for transmitting the first TBF through this parameter. Then, the CS
types of other TBFs are dynamically adjusted based on the signal
transmission quality.
Default value: cs2
DnDefaultCs
Meaning: retransmission rate threshold for the uplink TBF to
change from CS-1 to CS-2
Value range: 0-64
Explanation: When the retransmission rate of the uplink TBF is
smaller than or equal to the value of this parameter, the code
scheme of the uplink TBF changes from CS-1 to CS-2.
Default value: 5
UpThdCsUpGrade1
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page33Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Coding Scheme
UpDefaultCs:CS2
UpThdCsUpGrade1:5
UpThdCsUpGrade2:3
UpThdCsUpGrade3:2
CS1
CS4
CS3
CS2Retrans rate:2
UpThdCsUpGrade3:5
UpThdCsUpGrade3:5
UpThdCsUpGrade3:10
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page34Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PDCH Channel Parameters
Value range: 10-80
Explanation: Downlink multiplex threshold of dynamic channel
conversion
Default value: 20
Downlink Multiplex
Threshold of Dynamic
Channel Conversion
Value range: 10-70
Explanation: Uplink multiplex threshold of dynamic channel
conversion. When the number of subscribers reaches this
threshold, the dynamic channels are used. If this threshold is
high, it is difficult to seize dynamic channels. If this threshold is
low, it is easy to seize dynamic channels.
Default value: 20
Uplink Multiplex
Threshold of Dynamic
Channel Conversion
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page35Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PDCH Channel Parameters
Value range: 10-80
Explanation: The maximum downlink TBFs on one PDCH
channel
Default value: 80
PDCH Downlink
Multiplex Threshold
Value range: 10-70
Explanation: The maximum downlink TBFs on one PDCH
channel. If this threshold is set to a higher value, the TBFs
established on the PDCH and the subscribers are more,
and the uplink bandwidth for each subscriber is lower.
Value 10 indicates a maximum of one TBF can be
established on the PDCH.
Default value: 70
PDCH Uplink
Multiplex Threshold
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page36Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PDCH Channel Parameters
Downlink Multiplex Threshold of Dynamic Channel Conversion:20
PDCH PDCH PDCH PDCH Dynamic PDCH
Dynamic PDCH
Dynamic PDCH
Dynamic PDCH
MS1
MS2
PDCH PDCH PDCH PDCH
MS3
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page37Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
PDCH Channel ParametersPD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page38Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Channel Priority TypePD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page39Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Channel Priority Type
When Channel Type is set to non-PDTCH, the default value is None-GPRS
Channel.When Channel Type is set to PDTCH and the cell does not support EDGE
services, the default value is EGPRS Normal Channel.When Channel Type is set to
PDTCH and the cell supports EDGE services, the default value is EGPRS Normal
Channel.
Description
When Channel Type is set to non-PDTCH, the default value is None-GPRS
Channel. When Channel Type is set to PDTCH and the cell does not support
EDGE services, the default value is EGPRS Normal Channel. When Channel Type
is set to PDTCH and the cell supports EDGE services, the default value is EGPRS
Normal Channel.
Default Value
GPRS Channel, EGPRS Normal Channel, EGPRS Priority Channel, EGPRS
Special Channel, None-GPRS Channel
Value Range
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page40Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Channel Priority Type
TRX2
EGPRS
Normal
EDGE MS GPRS MS
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page41Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Channel Priority Type
TRX2
EGPRS
Priority
EDGE MS
××××reject
EGPRSPriority
GPRS MSGPRS MS
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page42Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS Channel Priority Type
TRX2
EGPRS
Priority
GPRS MSEDGE MS
××××release
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page43Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
EDGESPARAPD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page44Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
EDGESPARA� EDGE codec will be dynamically adjusted the MCS depended on BEP.
� BEP:Bit Error Probability .Each radio block is consist of 4 bursts, there is a BEP
value for each block, such as BEP1,BEP2,BEP3,BEP4.
� Mean-BEP is the average of four BEPs, from BEP1 TO BEP4. MEAN_BEP=
(BEP1+BEP2+BEP3+BEP4)/4. So Mean-BEP is the average quality of
receiving signal.
� CV_BEP is the result of standard deviation. It shows us the stability of receiving
quality.
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page45Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
BEP Table
MCS-7MCS-7MCS-7MCS-7MCS-7MCS-7MCS-6MCS-615
MCS-7MCS-7MCS-7MCS-7MCS-6MCS-6MCS-6MCS-614
MCS-7MCS-7MCS-7MCS-6MCS-6MCS-6MCS-6MCS-613
MCS-7MCS-7MCS-6MCS-6MCS-6MCS-6MCS-6MCS-612
MCS-7MCS-6MCS-6MCS-6MCS-6MCS-6MCS-5MCS-511
MCS-6MCS-6MCS-6MCS-6MCS-6MCS-5MCS-5MCS-510
MCS-6MCS-6MCS-6MCS-6MCS-5MCS-5MCS-5MCS-59
MCS-6MCS-6MCS-6MCS-5MCS-5MCS-5MCS-5MCS-58
MCS-6MCS-6MCS-5MCS-5MCS-5MCS-5MCS-5MCS-57
MCS-6MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-56
MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-55
MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-54
MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-53
MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-52
MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-5MCS-518PSKMEANBEP
87654321
8PSK_CV_BEP BEP
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page46Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
EDGESPARA
Meaning: fixed MCS type of the uplink
Value range: MCS1-MCS9, unfixed
Explanation: To adopt the fixed MCS type of the uplink,
set this parameter to a value among MCS1-MCS9; to
dynamically adjust the MCS type of the uplink, set this
parameter to unfixed. Default value: unfixed
UpFixMcs
Meaning: link quality control mode
Value range: IR-0, LA-1
Explanation: link quality control mode Default value: LA
LqcMode
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page47Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
LA and IR
� The network dynamically adjusts the coding scheme EDGE
based on the link quality. The link quality is determined by
8PSK MEAN BEP and 8PSK CV BEP carried in the Packet
EGPRS Downlink Ack/Nack message.
� The network should retransmit different data blocks with the
puncturing coding scheme. The MS buffers the history error
information and the data blocks are retransmitted through
combined error correction.
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page48Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
EDGESPARA
Meaning: fixed MCS type of the downlink
Value range: MCS1-MCS9, unfixed
DnDefaultMcs
Meaning: default MCS type of the uplink
Value range: MCS1-MCS9
Explanation: To dynamically adjust the MCS type of the
downlink, set the MCS type for transmitting the first TBF
through this parameter. Then, the MCS types of other TBFs
are dynamically adjusted based on the signal transmission
quality. Default value: MCS3
UpDefaultMcs
Meaning: fixed MCS type of the downlink
Value range: MCS1-MCS9, unfixed
DnFixMcs
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page49Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
N3101
M S Network
A
RLC block(with USF valid)
RLC block (with USF valid)
NO RESPONSE FROM MS
N3101=N3101_MAX
� N3101 will be increased by 1 every time no uplink data block is received.� The TBF will be released by network if N3101 reaches the threshold.
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page50Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
N3103
M S Network
A
PACKET UPLINK ACK/NACK(FAI=1)
NO RESPONSE FROM MS
N3103=N3103_MAX
PACKET UPLINK ACK/NACK(FAI=1)
� N3103 will be incremented by 1 every time no “ACKOWNLEDGEMENET”
message is received during TBF release.
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page51Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
MS Network
A
DOWNLINK DATA BLOCK (RRBP)
DOWNLINK DATA BLOCK (RRBP)
DOWNLINK DATA BLOCK (RRBP)
MS no response.....
N3105� Network will send the RLC data block with RRBP periodically to wait response
message from MS. N3105 will be increased by 1 every time no ” PACKET DOWNLINK
ACK/NACK” is received , otherwise N3105 will be reset.
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page52Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
GPRS&EDGE Coding Scheme
8PSKGMSK
9.05
13.415.6
21.4
8.811.2
14.817.6
22.4
29.6
44.8
54.4
59.2
0.00
10.00
20.00
30.00
40.00
50.00
60.00
CS-1 CS-3 CS-4 MCS-1 MCS-2 MCS-3 MCS-4 MCS-5 MCS-6 MCS-7 MCS-8 MCS-9
Kbps
GPRS
EGPRS
CS-2
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page53Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Appendix
1+31+21+11+0Idle timeslot
MCS9MCS8MCS7MCS6MCS5MCS4MCS3MCS2MCS1
CS4CS3CS2CS1Codec
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page54Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
AppendixPD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Page55Copyright © 2009 Huawei Technologies Co., Ltd. All rights reserved.
Summary
In this course, we have learned:
� The function of GPRS cell parameters
� The function of GPRS cell selection parameters
� The function of GPRS performance parameters
PD
F C
reated with deskP
DF
PD
F W
riter - Trial :: http://w
ww
.docudesk.com
Tha
nk y
ouw
ww
.hua
wei
.com
PDF Created with deskPDF PDF Writer - Trial :: http://www.docudesk.com