GSM P&O Training Material for Skill Certificate-GPRS Parameter Setting

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 5System message 5 System message 13System message 13



Catalog

Overview


R_PSBTS Basic 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.



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.




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.



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


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



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


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


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


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


MSBSS

RlcMac_T3195

N3105max..

Data Block（RRBP）

Release TFI

Data Block（RRBP）

Data Block（RRBP）PACK DLLINK

ACK/NACK

Catalog

Overview




R_PSPOC Parameters

R_PSTIMER


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.


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


“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.


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.


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.



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.


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


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


PACKET CONTROL ACK

Non-ack mode

T3192


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. ）


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.


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 ）


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


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


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




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.


Value Connotation

0 Block reserved for PAGCH, PDTCH and PACCH is 0


…


13~15 The same with 0


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.


Value connotation

0 0 block reserved for PRACH

1 1 block reserved for PRACH

…

12 12 blocks reserved for PRACH



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


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.


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


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.


value connotation

0 Once allowed

1 Twice allowed

2 4 times allowed

3 7 times allowed


RaColor Router Area Color Codedescription ：


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)


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.


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



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_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 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 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


ReselOff GPRS Cell Reselection Offset description ：


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


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


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


RadAcRetry Random Access Retrydescription ：


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



T_RESEL Reselect The Previous Cell Intervaldescription ：


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. ）


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 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.



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 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.


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 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.



value Time represents

0 10 sec.

1 20 sec.

… …

31 320 sec.

Catalog

Overview




R_PSPOC Parameters

R_PSTIMER

Alpha Power Control description ：


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 ）


R_PSPOC Parameters

value connotation

0 =0.0

1 =0.1

2 =0.2

…

9 =0.9

10 =1.0


T_Avg_W Power Control Filter Period in Packet Idle

Mode description ：


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.


R_PSPOC Parameters

value connotation

0 Filter period is 2(0/2)/6 multiframe


…



T_Avg_T Power Control Filter Period in Packet Tra

nsmitting Modedescription ：


Is a power control parameter in BSC and GPRS system and is broadcast i


It’s period of power strength in packet transmitting mode.


R_PSPOC Parameters

value connotation



…


26~31 reserved

PcMeasChan Power Control Measurement Channe

ldescription ：


Is a power control parameter in BSC and GPRS system and is broadcast i


It indicates DL power strength measurement location for UL power control

purpose.


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


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.


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 power control parameter of BSC and GPRS system and is broadcast i


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 ）


R_PSPOC Parameters

DlPwCtrl DL Power Control Strategydescription ： it decides GPRS DL power control strategy.


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_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


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


PACKET CONTROL ACK

“ PACKET CONTROL ACK” message received

MSBSS

RlcMac_T3191

Data Block

Release TBF


“ PACKET CONTROL ACK” message not received


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


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


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

Documents

GSM P&O Training Material for Skill Certificate-GPRS Parameter Setting