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DESCRIPTION
GPRS parameter detail
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GPRS Radio Parameters SettingGPRS Radio Parameters Setting
GSM Network Planning & Optimization Dept.
Objectives
After completing this course, you are able to
• Comprehend the basic meanings of common GPRS radio parameters
• Know the setting of common GPRS radio parameters
• Grasp the instructions of GPRS radio parameter setting
Catalog
Overview
R_PSBSC Parameters Introduction
R_PSBTS Basic Parameter
GPRS Cell Reselection Parameters
R_PSPOC Parameter
R_PSTIMER
Function of Radio Parameters
Overview
Optimization
scheme forming
Network optimization
Data collecting
Optimization
scheme
implementation
Adjustment &
validation
Radio parameter adjustment
optimize network perfor
mance
improve network perfor
mance
optimize resource confi
guration
Features of GPRS Radio Parameters
Overview
Correlation of GPRS radio parameters
and GSM radio parameters
Features of GPRS radio parameters
GPRS Radio Parameter Classification
Overview
GPRS cell reselection parameters
Measurement report control parameters
Cell selection parameters
Cell access control parameters
Power control parameters
GPRS cell reselection parameters
Radio parameter classification
QOS Overview
Delay class
Peak value throughput
Reliability class
Qos priority
Average throughput
QOS
OverviewGPRS System Message
System messageSystem message
System message 1System message 1
System message 3System message 3
System message 5System message 5 System message 13System message 13
System message 4System message 4
System message 2System message 2
Catalog
Overview
R_PSBSC Parameters Introduction
R_PSBTS Basic Parameters
GPRS Cell Reselection Parameters
R_PSPOC Parameters
R_PSTIMER
CellFcThs BVC Flow Control ThresholdDescription:
“BVC flow control” triggering threshold.
BVC flow control is carried out on DL in Gb interface, BSS providing con
trol parameters and SGSN executing it.
The purpose is to avoid the condition that part of LLC data discard when
packet channel is busy in BVC or new DL LLC data discard due to interior
resource lack.
value : 1~100 ( % )setting : 80 by default
R_PSBSC Parameter Introduction
CellFcPer BVC Power Control PeriodDescription :
In “BVC power control” flow control, BVC leakage ratio statistics period is also cal
led ‘BVC long measurement period”.
In order to provide reference for BVC flow control in SGSN, BSSGP procedure
make periodic statistic of leakage ratio of BVC; when long measurement timer overf
lows, “BVC flow control” process will be initiated and if the difference between forw
ard and after leak rate exceed CellFcThs, it needs SGSN confirmation; ;When short statistics timer overflows, and the different between the forward and
after leak rates exceeds CellFcThs, “BVC flow control” process will be initiated and
wait for confirmation by SGSN.
value : 1~100 ( % )setting : 80 by default
R_PSBSC Parameters Introduction
MsFcThs MS Power Control Threshold description :
“MS flow control” flow triggering threshold.
MS flow control is carried out on DL in Gb interface, with BSS providing
parameters and SGSN executing it.
The purpose is to avoid the condition that part of LLC data discard when
packet channel is busy in BSS or new DL LLC data discard due to interior
resource lack.
value : 1~100 ( % )setting : 80 by default
R_PSBSC Parameters Introduction
R_PSBSC Parameters Introduction
MsFcPer MS Power Control Perioddescription :
In “MS power control” process, MS leakage rate statistics period is also called “M
S long measurement period.
In order to provide reference for flow control in SGSN, BSSGP procedure makes
periodic statistic of leakage ratio of MS.
when long statistics timer overflows, “MS flow control” process will be initiated and
if the difference between forward and after leakage ratio exceeds CellFcThs, it need
s SGSN confirmation ;When short measurement timer overflows, and the different between the forward
and after leak rates exceeds MsFcThs, “MS flow control” process will be initiated an
d wait for confirmation by SGSN.
value : 1~100 ( % )setting : 80 by default
R_PSBSC Parameters Introduction
FlowCtrlMode Power Control Mode description : different manufactures use different methods to realize SGSN power contr
ol. There are different modes in BSC, through which power control parameters is reported
to SGSN. The modes are as follows:
Mode 1 : report power control parameters based on flow on radio interface recor
ded by BSC. ;Mode 2 : report flow control parameters according to maximum flow allowed by t
he cell;
Mode 3 :value : 1~100 ( % )setting : 80 by default
R_PSBSC Parameters Introduction
MNO Network Operation Mode description :
Parameter used in MS( belonging to GPRS cell parameters) is broadca
sted to MS in messages of PSI1, PSI13 and SI13 indicating network oper
ation mode in the cell. The network operation modes are as follows:
Network operation mode 1
Network operation mode 2
Network operation mode 3
setting : 1 by default ( network operation mode 2 )
note :MNO of cell in one RAC shall be the same;
Gs interface has effect on the selection of NMO.
value connotation
0 Network operation mode1
1 Network operation mode 2
2 Network operation mode 3
3 unused
R_PSBSC Parameters Introduction
N3101 Maximum Number of UL Data Block Allowe
d to Be Lost Continuouslydescription :
Parameter used in RLC/MAC layer in BRP
In packet UL transmission process, BSS will assign USF (corresponding to one UL TBF) for eac
h UL block.
For one USF, if the network receives data correctly on assigned UL block, counter N3101 will be
null; If the losses on assigned UL block is continuous and the number of losses exceeds counter N
3101, counter T3169 will start; When T3169 exhausts, TFI and USF can be used again.
value : 9~255
Setting: 10 by default
MSBSS
RlacMac_T3169
N3101max..
USF=n
Release USF & TFI
USF=n
USF=n
R_PSBSC Parameters Introduction
N3103 “Packet UL ACK/NONACK” Retry Numberdescription :
Parameter used in RLC/MAC layer in BRP.
In packet UL transmission process, If the network detects that UL TBF
ends (CV=0 , and V(Q)=V(R)) after receiving all RLC data block, the net
work shall send the “packet uplink ack/unack” message, set FAI (final ack
ID) to be 1, include a valid RRBP field in the header of RLC/MAC control b
lock and set N3103 to be zero.
value : 0~255
setting : 10 by default
MS
CV=0
BSS
PACKET UPLINK ACK/NACK
PACKET UPLINK ACK/NACK
PACKET CONTROL ACK
RlcMac_T3169
N3103max
.
.
CV=0
Release USF and TFI
R_PSBSC Parameters Introduction
N3105 Maximum Number of UL “RLC/MAC Control” Message
Allowed to Be Lost Continuously
description :Parameter used in RLC/ MAC layer in BRP.
In packet DL transmission process, BSS will configure RRBP field in DL RLC data bl
ock at regular intervals, with the help of which informs MS to send “RLC/MAC control”
message (such as ”packet DL ack” message )on relative UL block. For one TBF, If the
losses “RLC/MAC control” message are continuous and the number of losses exceeds
N3105 ( N3105max), T3195 will start; when T3195 times out, the network will reuse T
FI resource.
value : 0~255
setting : 10 by default
MSBSS
RlcMac_T3195
N3105max..
Data Block(RRBP)
Release TFI
Data Block(RRBP)
Data Block(RRBP)PACK DLLINK
ACK/NACK
Catalog
Overview
R_PSBSC Parameters Introduction
R_PSBTS Basic Parameters
GPRS Cell Reselection Parameters
R_PSPOC Parameters
R_PSTIMER
R_PSBSC Parameter Introduction
NSEI Network Service Entity ID description :
In BSSGP layer, for management conveniences, each GPRS cell is given
a BVC(NSEI+BVCI) which is affiliated to one NSE.
NSE is network service entity, which is numbered in the network and is id
entified by NSEI.
value : 0~0xFFFF
setting : configured by the operator
remark :Generally, one BSC is considered to be an independent service entity con
taining several NSE in ZXG10 system.
R_PSBSC Parameter Introduction
NSEI Network Service Entity ID Structure sketch:
NSE
BVC1
BVCn
NSVC1
PVC1
NSVCn
PVCn
NSE
BVCn
PVC1
NSVCn
PVCn
BVC1
NSVC1
FR Net
BSC SGSN
LSP1 LSPn LSP1 LSPn
R_PSBSC Parameters Introduction
“BVCI BSSGP Virtual IDdescription :
BSSGP virtual connection (BVC) provide a means for communication amo
ng different BSSGP entities.
BVC is the basic of sending BSSGP PDU between corresponding PTP, P
TM and signaling entities. Each virtual connection has an identification (BV
CI), which helps network service layer to route BSSGP PDU to correspondin
g entities.
value : 0~65535(0: identifies signaling function entity; 1: identifies PT
M function entity)
setting : configured by the operator
remark : in one NSE, each GPRS cell can be identified by one BVCI.
R_PSBSC Parameter Introduction
RAC Routing Area CodeDescription:
Similar to GSM system, LAC is applied in GPRS system to manage a gro
up of cells; what’s more, LAC is divided into RAC which are identified by RAI
(MCC + MNC + LAC + RAC) in GPRS system.
When MS cell in ATTACH state is reselected, if RAI of new and old cell is
different, “RAC update” will be initiated. SGSN will call MS in standby state i
n the RAC when PS or CS data shall be sent in the network.
Value : 0~255
Setting : configured by the operator
Effect : too delicate RAC differentiation will lead to frequent RAC upd
ate and add to signaling load.
remark : one RAI belongs to one SGSN.
R_PSBSC Parameter Introduction
T3168description :
Parameter used in MS which is a GPRS cell optional parameter and is bro
adcast to MS in PSI1, PSI13, and SI13 indicating the maximum time waiting
for PACKET UPLINK ASSIGNMENT message after sending PACKET DOW
NLINK ACK/UNACK message (or Channel Request Description IE containe
d in PACKET DOWNLINK ACK/UNACK message ).
ssetting : 7 by default(4.0 second) value Time length
0 0.5 sec.
1 1.0 sec.
2 1.5 sec.
…
7 4.0 sec.
R_PSBSC Parameter Introduction
T3192description :
Parameter used in MS.
In packet DL transmission process, if pending RLC data block is the last
DL data block, the network will initialize DL TBF release through sending a
RLC data block, of which FBI is 1, and containing a valid RRBP field.
setting : 0 ( 500ms )。remark : the time length which T3192 represents shall be less than the time len
gth of T3193(protecting DL TBF) so as to ensure the exclusiveness of TFI.
R_PSBSC Parameters Introduction
T3192influence :
The greater the value of the parameter is, the longer
TBF relative resource (including TFI and timeslot) will b
e reserved. Similarly, TBF sending time will be longer
which will easily lead to congestion.
The smaller the value of the parameter is, the longer
DL TBF establishment will be. Because MS will releas
e TBF quickly and if receiving new DL data, the networ
k will make paging or initiate immediate assignment pro
cess (if MS is standby).
If new DL data arrives at the network before T3192 e
xpires, the network will send ”packet DL assignment”
message to establish a new DL TBF to shorten the TB
F establishment.
value Time length represents ( unit : ms)
0 500
1 1000
2 1500
3 0
4 80
5 120
6 160
7 200
R_PSBSC Parameters Introduction
T3192Signaling Procedure Sketch:
MSBSS
< RlcMac_T3191
Data Block
Release resource
Data Block(RRBP,FBI=1)
PACKET DOWNLINK ACK/NACK(FAI=1)
Ack Mode
T3192
MSBSS
< RlcMac_T3191
Data Block
Release resource
Data Block(RRBP,FBI=1)
PACKET CONTROL ACK
Non-ack mode
T3192
R_PSBSC Parameters Introduction
DrxTimeMax Non-DRX Mode Holding Time description :
Parameters used in MS, which is a GPRS cell optional parameter and bro
adcast to MS in PSI1, PSI13 and SI13 indicating DRX_TIMER_MAX value.
When MS mode changes from packet transmission to packet idle (also cal
led non-DRX), the time that MS stay non-DRX is decided by minimum of N
ON_DRX_TIMER and DRX_TIMER_MAX.
setting : 2 by default Value Time length
0 0 sec.
1 1sec. ( 2(1-1)sec. )
2 2 sec. ( 2(2-1) sec. )
3 4 sec. ( 2(3-1) sec. )
…
7 64 sec. ( 2(7-1) sec. )
R_PSBSC Parameters Introduction
DrxTimeMax Non-DRX Mode Holding Timeinfluence :
In non-DRX mode, MS will monitor CCCH blocks, and PCU will contain co
ntext concerning MS. Immediate assignment messages about DL TBF estab
lishment can be sent on AGCH in stead of making paging.
Non-DRX mode will help to shorten DL TBF establishment, which will also
quicken the consumption of battery.
R_PSBSC Parameters Introduction
BsCvMax Maximum sending block numberdescription :
BsCvMax is a GPRS cell optional parameter used in MS which is broadcast to MS in t
he messages of PSI1, PSI13 and SI13 indicating the maximum number of blocks allowe
d to be sent in each timeslot.
CV value is average number of pending data block in each timeslot which is sent by M
S when the value is less than 15.
Setting:15 ( 300ms )influence :
If BS_CV_MAX is set to be too small, RLC data
block may be retransmitted before ack message
is received, which will result in the high occupancy
rate of radio resource; If BS_CV_MAX is too
highly set, the efficiency of the sliding window may
be reduced which may result in the slow data
transferring rate
value connotation
0 1 block ( time length )
1 1 block ( time length )
2 2 blocks ( time length )
… …
15 15 blocks ( time length )
R_PSBSC Parameters Introduction
PanDec, PanInc, PanMax N3102 Decision Valuedescription :
They are GPRS cell optional parameters used in MS which are broadcast i
n messages of PSI1, PSI13 and SI13, indicating the value of PAN_DEC, PA
N_INC and PAN_MAX.
Each time cells get reselected, N3102 will resume PanMax.
When N3102 < 0, TBF will abnormally released and cell reselection will b
e executed.
When PanDec, PanInc or PanMax is zero, N3102 is invalid.
value : PanDec, PanInc, and PanMax : 0 ~ 7
setting : PanDec ( 0 ) ,PanInc ( 1), and PanMax ( 7 ) by default
R_PSBSC Parameters Introduction
PanDec, PanInc, PanMax N3102 Decision Valueinfluence :
To add PANMAX and PANINC, and reduce PANDEC will reduce the possi
bilities of cell reselection due to TBF abnormal release when MS can’t receiv
ing Packet Uplink Ack; at the same time, MS sending window will pause and
occupy radio resources for a long time which is the source of inefficiency of r
adio utility rate.
To reduce PANMAX and PANINC, and
add PANDEC will easily lead to cell
reselection due to TBF abnormal release,
reduce TBF normal release rate and affect
data transferring rate.
PanMax value Value represents
0 4
1 8
2 12
… …
7 32
R_PSBSC Parameters Introduction
PbcchBlks PBCCH Reserved Blocks Description:
Parameters used in MS
Is a PCCCH structural parameter and is broadcast to MS in PSI1
This parameters indicates the number of 52 multiframe(12 blocks) assigne
d to be PBCCCH. PBCCH is used by packet system messages sent at high-
speed and low speed. This parameter shall be configured with PSI1_REPE
AT_PERIOD in PSI1 message to ensure the availability of blocks to send m
essages both at high speed and low speed.
Setting: 0 by defaultvalue connotation
0 PBCCH uses 1 block in multiframe
1 PBCCH uses 2 blocks in multiframe
2 PBCCH uses 3 blocks in multiframe
3 PBCCH uses 4 blocks in multiframe
R_PSBSC Parameters Introduction
PagBlkRes PAGCH Reserved Blocks Numberdescription :
Is parameters used in MS 。Is a PCCCH structural parameter and is broadcast to MS in PSI1 message.
It indicates the number of blocks (PAGCH, PDTCH and PACCH ) exclusive of packet
paging and PBCCCH. ‘UL assignment” message can be sent firstly on these blocks so
as to quicken TBF establishment. After channel requests on PRACH, “UL assignment”
message can be received on PCCCH which is in the same timeslot with PRACH.
setting : 5 by default
Value Connotation
0 Block reserved for PAGCH, PDTCH and PACCH is 0
1 Block reserved for PAGCH, PDTCH and PACCH is 1
…
12 Block reserved for PAGCH, PDTCH and PACCH is 12
13~15 The same with 0
R_PSBSC Parameters Introduction
ParchBlks PRACH Reserved Blocks description :
Is parameter used in MS.
Is a PCCCH structural parameter and is broadcast to MS in PSI1 messag
e.
It indicates the fixed blocks reserved for PRACH in PDCH loading PCCCH.
These blocks need to be identified by USF=FREE. MS uses this parameter
s or USF=FREE to assign PRACH.
setting : 2 by default
Value connotation
0 0 block reserved for PRACH
1 1 block reserved for PRACH
…
12 12 blocks reserved for PRACH
13~15 The same with 0
R_PSBSC Parameters Introduction
TxInt Packet Access Attempt Interval
Amplitudedescription :
Is parameters used in MS.
Is a PRACH control parameter and is broadcast to MS in P
SI1 message.
Each time new connection is established, MS will send cha
nnel request message in PRACH.
PRACH is a ALOHA. To improve MS accessibility, MS is all
owed to send multiple channel requests before receiving pack
et assignment message. Before getting response after previo
us channel request, MS will resend channel request within ran
dom time. TxInt is random waiting time.
Setting: 2 by default(4 timeslots)
Value connotation
0 2 delay TSL
1 3 delay TSL
。。。。 。。。。。
8 10 delay TSL
9 12 delay TSL
10 14 delay TSL
11 16 delay TSL
12 20 delay TSL
13 25 delay TSL
14 32 delay TSL
15 50 delay TSL
R_PSBSC Parameters Introduction
S Packet Access Attempt Interval Peri
od description :
Is parameters used in MS.
Is PRACH control parameter and is broadcast to MS in PSI1
message.
Each time a new connection is established, MS will send chan
nel request message in PRACH.
PRACH is a ALOHA. To improve MS accessibility, MS is allo
wed to send multiple channel requests before receiving packet a
ssignment message. TxInt is random wait time.
setting : 2 by default
value connotation
0 S=12
1 S=15
2 S=20
3 S=30
4 S=41
5 S=55
6 S=76
7 S=109
8 S=163
9 S=217
10~15 reserved
R_PSBSC Parameters Introduction
MaxRetrans Maximum Attempt
Number description :
Is a PRACH control parameter used in MS and i
s broadcast to MS in PSI1.
Indicates maximum number of access attempts i
n PRACH of MS with the priority level from 1 to 4.
value :this parameter is an array, array element is 4, the f
irst array element corresponds to the maximum att
empts with the 1 priority, and so forth.
Setting: 2 by default
value connotation
0 Once allowed
1 Twice allowed
2 4 times allowed
3 7 times allowed
R_PSBSC Parameters Introduction
RaColor Router Area Color Codedescription :
Is parameter used in MS.
Is broadcast to MS in SI3, SI4, SI7 and SI8.
The function of RaColor is similar to BCC in GSM system. To ens
ure that MS can initiate ”router area update” process (when cell res
election is made cross-BSC), adjacent cells with the same RAC are
assigned with different RaColor.
Setting: 2 by default(4 timeslot)
R_PSBSC Parameters Introduction
NcNoDrxPer NC Non-DRX Holding Timedescription :
Is a parameter used in MS.
Is network control measurement parameter broadcast in PSI5 and ind
icates minimum time of MS stay non-DRX after sending NC measurem
ent report for once.
When Ctrl Order is NC0 (no measurement report when MS makes cel
l reselection), it isn’t broadcast in PSI5.
Setting: 2 by default( invalid when NC=0)
value connotation
0 Non-DRX
1 0.24 sec.
2 0.48 sec.
3 0.72 sec.
4 0.96 sec.
5 1.20 sec.
6 1.44 sec.
7 1.92 sec.
R_PSBSC Parameters Introduction
CsChansThs Minimum Idle CS Channel Num
berdescription :
Is a parameter used in DBS in Pn
Indicates minimum number of CS idle channels when 一 PS+CS
channels is change to be PS channels.
If idle CS channel number is lower than the minimum number, d
ynamic PS+CS channel can’t be changed to be PS channel; and vic
e versa.
value: 0~255
Setting: 2 by default
R_PSBSC Parameters Introduction
PccchIndTh PCCCH Overload Thresholddescription :
Is a parameter used by FUC in BTS.
Indicates PCCCH ( PRACH 、 PPCH ) overload threshold.
Is an array consisting of 3 in the unit of % .
value : 0 ~ 100 ( % )setting : 50 by default
Catalog
Overview
R_PSBSC Parameters Introduction
R_PSBTS Basic Parameters
GPRS Cell Reselection Parameters
R_PSPOC Parameters
R_PSTIMER
GPRS Cell Selection Arithmeticdescription :
C1 = RXLEV-GPRS_RXLEV_ACCESS_MIN-MAX(GPRS_MS_
TXPWR_MAX_CCH-P,O)
RXLEV-----receiving average power level (unit: dBm)
GPRS_RXLEV_ACCESS_MIN-----minimum GPRS access power l
evel (unit: dBm)
GPRS_MS_TXPWR_MAX_CCH-----maximum transmit power level
of MS (unit: dBm)
P-----MS maximum output power (unit: dBm)
GPRS Cell Reselection Parameters
GPRS Cell Selection ArithmeticC31 arithmetic formula:
C31 = RXLEV-HCS_THR (service cell)
C31=RXLEV-HCS_THR- GPRS_TEMPORARY_OFFSET*H(GPRS_PE
NALTY_TIME-T)*L (adjacent cell)
PRIORITY_CLASS (service cell )= PRIORITY_CLASS (adjacent cell ), L=0
PRIORITY_CLASS (service cell ) not equal to PRIORITY_CLASS (adjacent cel
l ), L=1
GPRS Cell Reselection Parameters
GPRS Cell Reselection ArithmeticC32 arithmetic
To select the cell among the cells with the same level priority, the following formula are
used:
C32=C1(serving cell )C32=C1+GPRS_RESELECT_OFFSET-GPRS_TEMPORARY_OFFSET*H(GPRS_PE
NALTY_TIME-T)*(1-L)(adjacent cell )When MS is in ready state and serving cell has the same RAC with the adjacent cell,
C32=C32+GPRS_CELL_RESELECT_HYSTERESIS
When MS is in standby or ready state and serving cell has different RAC with the adjac
ent cell,
C32=C32+RA_RESELECT_HYSTERESIS
When MS is in standby state and serving cell has different RAC with the adjacent cell
C32=C32
GPRS Cell Reselection Parameters
ReselOff GPRS Cell Reselection Offset description :
Is a parameter used in MS.
Is broadcast to MS in PSI3.
In GPRS, C32 is used for cell reselection. Similar to C2 in GSM, cell resel
ection offset (ReselOff) is used in C32 arithmetic. When ReselOff is 0dB, m
essage will not be sent.
setting : 0dB by default
GPRS Cell Reselection Parameters
value Relative power level
0 -52 dB
1 -48 dB
… …
10 -12dB
11 -10dB
… …
22 +12dB
23 +16dB
… …
31 +48 dB
ReselHys GPRS Cell Reselection Lag Description:
Is parameter used in MS
Is broadcast in PSI3.
When cell selection is made, and LAC of the source cell and target cell is f
ound to be different, a location update shall be initiated.
setting : ReselHys is generally set to be 4 or 5
GPRS Cell Reselection Parameters
Value Lag power level
0 0 dB
1 2 dB
2 4 dB
3 6 dB
4 8 dB
5 10 dB
6 12 dB
7 14 dB
C31_HYST C31 "Cell Reselection Hysteresis”description :
Is a parameter used in MS
Is broadcast in PSI3 and indicates whether ReselHys is available in C31.
Value : 0 unavailable
1 available
Setting: 0
GPRS Cell Reselection Parameters
RadAcRetry Random Access Retrydescription :
Is parameter used in MS.
Is broadcast in PSI3 and indicate whether MS is allowed to access another cell. In p
acket transmission process, if abnormal release occurs, running TBF will be discarded;
If it’s allowed to access other cell (RadAcRetry=1), cell reselection will be executed an
d UL TBF will be established in new cell.
If there are other suitable cell , MS can reselect previous cell within T_RESEL secon
d.
value : 0 not allowed
1 allowed
setting : 0 by default
GPRS Cell Reselection Parameters
T_RESEL Reselect The Previous Cell Intervaldescription :
Is parameter used in MS.
Is broadcast is PSI3. when the cell is abnormally released due to a cell re
selection, within T_RESEL, this cell is not allowed to be reselected except t
hat that are no other choice.
When T_RESEL is 5 second, the message will not be sent.
setting : 0 by default ( 5 sec. )
GPRS Cell Reselection Parameters
value Time length represents
0 5 秒
1 10 秒
2 15 秒
3 20 秒
4 30 秒
5 60 秒
6 120 秒
7 300 秒
RaReselHys Routing Area Reselection Hysteresisdescription :
Is a parameter used in MS.
Is broadcast in PSI3 and indicates the hysteresis value during choosing a
cell in another RAC when MS is in STANDBY and READY state. When the v
alue of this parameter is the same with that of ReselHys, it will not be sent in
the message.
Setting: 7 by default
GPRS Cell Reselection Parameters
value Hysterisis power level
0 0 dB
1 2 dB
2 4 dB
3 6 dB
4 8 dB
5 10 dB
6 12 dB
7 14 dB
TempOffset Cell Reselection Temporary Offset description :
Is a parameter used in MS.
Is broadcast in PSI3. In GPRS system, C32 is used in cell reselection. Si
milar to C2 in GSM, C32 has an temporary offset (TempOffset), and the effe
ctive time is decided by PenalTime.
setting : the same with offset value in C2
of GSM system.
GPRS Cell Reselection Parameters
value Relative power level ( dB )
0 0
1 10
2 20
3 30
4 40
5 50
6 60
7 infinite
PenalTime Cell Reselection Penalty Time description :
Is a parameter used in MS.
Is broadcast in PSI3. In GPRS system, C32 is used in cell reselection. Si
milar to C2 in GSM, C32 has an temporary offset (TempOffset), and the effe
ctive time is decided by PenalTime.
Setting: 0 by default
GPRS Cell Reselection Parameters
value Time represents
0 10 sec.
1 20 sec.
… …
31 320 sec.
Catalog
Overview
R_PSBSC Parameters Introduction
R_PSBTS Basic Parameters
GPRS Cell Reselection Parameters
R_PSPOC Parameters
R_PSTIMER
Alpha Power Control description :
Is a parameter used in MS.
Is a power control parameter of the network and is broadcast in PSI1, PSI
13 andSI13. 属于全局功率控制参数和 GPRS 功率控制参数之一This parameter decides of MS transmitting power control. MS transmittin
g power is decided by the following formula: P =min ( 0 - CH - a (C + 48) ,PMAX )
setting : 0 by default
R_PSPOC Parameters
value connotation
0 =0.0
1 =0.1
2 =0.2
…
9 =0.9
10 =1.0
11~15 The same with 10
T_Avg_W Power Control Filter Period in Packet Idle
Mode description :
Is a parameter used in MS.
Is a power control parameter of BSC and GPRS system and is broadcast i
n PSI1, PSI13 and SI13.
This parameter is a period of signaling strength filter in packet idle mode.
setting : 0 by default
R_PSPOC Parameters
value connotation
0 Filter period is 2(0/2)/6 multiframe
1 Filter period is 2(1/2)/6 multiframe
…
25 Filter period is 2(25/2)/6 multiframe
26~31 The same with 25
T_Avg_T Power Control Filter Period in Packet Tra
nsmitting Modedescription :
Is a parameter used in MS.
Is a power control parameter in BSC and GPRS system and is broadcast i
n PSI1, PSI13 and SI3.
It’s period of power strength in packet transmitting mode.
setting : 0 by default
R_PSPOC Parameters
value connotation
0 Filter period is 2(0/2)/6 multiframe
1 Filter period is 2(1/2)/6 multiframe
…
25 Filter period is 2(25/2)/6 multiframe
26~31 reserved
PcMeasChan Power Control Measurement Channe
ldescription :
Is a parameter used in MS.
Is a power control parameter in BSC and GPRS system and is broadcast i
n PSI1, PSI13 and SI13.
It indicates DL power strength measurement location for UL power control
purpose.
setting : 0 by default
value connotation
0 DL measurement in BCCH for power control
1 DL measurement in PDCH for power control
R_PSPOC Parameters
N_Avg_I Power Control Filter Constantdescription :
Is a parameter used in MS.Is a power control parameter in BSC and GPRS system and is broadcast i
n PSI1, PSI13 and SI13.
It a constant to filter interference signaling for power control.
setting : 0 by default value connotation
0 Filter constant
2(0/2)
1 Filter constant
2(1/2)
…
15 Filter constant
2(15/2)
R_PSPOC Parameters
UlPwCtrl UL Power Control Strategy description : it decides GPRS UL power control strategy.
setting : 0 by default
R_PSPOC Parameters
value UL Power control strategy
0 Not controlled
1 Open-loop control
2 Closed loop control
3 Based o quality
other reserved
DlPwCtrl DL Power Control Strategy description :
Is a parameter used in MS.
Is a power control parameter of BSC and GPRS system and is broadcast i
n PSI1, PSI13 and SI13.
This parameter decides of MS transmitting power control. MS transmittin
g power is decided by the following formula: P =min ( 0 - CH - a (C + 48) ,PMAX )
setting : 0 by default
R_PSPOC Parameters
DlPwCtrl DL Power Control Strategydescription : it decides GPRS DL power control strategy.
setting : 0 by default
R_PSPOC Parameters
value DL Power control stategy
0 Not controlled
1 Open-loop control2 Closed loop control3 Based o qualityother reserved
Catalog
Overview
R_PSBSC Parameters Introduction
R_PSBTS Basic Parameters
GPRS Cell Reselection Parameters
R_PSPOC Parameters
R_PS Timer
T3169 description :
Timer start condition: when N3101 = N3101max, or N3103 = N3103max.
Timer stop condition: no
Time out action: release USF and TFI resource
Value : 0~0xFFFF ( 10ms )setting : 500 by default ( 5 sec. )
R_PS Timer
T3191description :
In packet DL transmission process, if pending RLC data block BSN is the biggest, th
e network will initialize DL TBF release through sending a RLC data block, of which FB
I is 1, and containing a valid RRBP field. T3191 will be started then.
The following is processing flow in non-ack mode. Processing flow in ack mode is sil
imar.
R_PS Timer
MSBSS
RlcMac_T3193
< RlcMac_T3191
Data Block
Release TBF
Data Block(RRBP,FBI=1)
PACKET CONTROL ACK
“ PACKET CONTROL ACK” message received
MSBSS
RlcMac_T3191
Data Block
Release TBF
Data Block(RRBP,FBI=1)
“ PACKET CONTROL ACK” message not received
T3191description :
Timer start condition: when the last RLC data block is sent (FBI is marked
by 1).
Timer stop condition: PACKET DOWNLINK ACK/NACK or PACKET CON
TROL ACKNOWLEDGEMENT is received. Timer shall be started if RLC dat
a block with FBI 1 shall be transmitted.
Overtime indication : release TFI.
value : 0~0xFFFF ( 10ms )setting : 500 by default(5 sec. )
R_PS Timer
T3193 description :
Timer starting condition: when last PACKET DOWNLINK ACK/NACK or P
ACKET CONTROL ACKNOWLEDGE message is received.
Timer stop condition: when a new DL TBF is established.
Expire indication : release TFI
value : 0~0xFFFF ( 10ms )setting : 500 by default ( 5 sec. )
R_PS Timer
T3195 description :
It’s TBF protecting time when radio link fails or MS doesn’ t respond du
e to cell change. In packet DL transmitting process, if N3105 expires ,BSS will start T3195; when T3195 gets exhausted, TFI can be used agai
n.
timer starting condition: N3105 = N3105max.
timer stop condition: no
expire indication: release TFI
value : 0~0xFFFF ( 10ms )
setting : 500 by default ( 5 sec. )
R_PS Timer
Recommended