GSR8 GPRS Features

7/29/2019 GSR8 GPRS Features

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GSR 8 GPRS Features


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Contents

Chapter 2 GPRS features

FR22100 - GPRS Resources (PDTCH) configured

FR22577 GPRS Statistic and enhancements

FR22708 / FR23706 - Network assisted Cell Change

FR23769 Versa Trau


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GPRS Resources (PDTCH) configured

FR 22100


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Feature Overview

Verification and display of the current GPRSresources configuration

Capability to display the maximum resourceconfiguration

PDTCH configuration against PCU capacity

Ability to display the PRP / cell mapping


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New, modified and deleted commands

There are no new commands introduced with this feature

The following commands are modified in this feature

disp_equipment

unequip

equip modify_value

chg_element

chg_cell_element

sysgen_mode

stat_mode disp_enable_stat

disp_stat_prop

disp_stats

chg_stat_prop

disp_bss

There are no deleted commands as a result of this feature


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New, modified and deleted parameters

There are no new parameters introduced in this feature:

There are no modified parameters associated with this feature

There are no deleted parameters as a result of this feature


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New, modified and deleted statistics

The following statistics are introduced in this feature:

PRP_PD_DEMAND

GCI_FOR_64KPD_DEMAND



TOTAL_GCI_FOR_PD_DEMAND

There are no modified statistics associated with this feature

There are no deleted statistics as a result of this feature


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PDTCH / PRP / PMC / GDS Trau limitations

120 Air TS / PRP (Combination of 16K / 32K / 64K)30 Air TS / PRP in active state (Combination of 16K / 32K / 64K)

GPRS 1 GDS Trau link / PMC / PRP

EGPRS 2 GDS Trau links / PMC / PRP

1 PMC can support - 124 * 16K Trau TS (1 E1 Link)- 62 * 32K Trau TS ( 1 E1 link)- 62 * 64K Trau TS (2 E1 Links)


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GPRS Timeslot Verification


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GPRS Timeslot Verification - Calculations

PMC 0

GDS 1

GDS 0

PRP 1

PMC 1

GDS 2

PRP 2 3 TRAU GDS and 2 PMCs

equipped on 2 PRPs

8 x 64K air PDTCHs81 x 16K air PDTCHs


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GPRS Timeslot Verification - Calculations

Max Configurable PDTCHs is dependent on:

GDS resources available (124x16K resources per GDS)PMC processing capability (124x16K TRAU or 62x32K/64K TRAU per PMC)

PRP capacity (120 per PRP)

Calculation is carried out in a number of steps

1 Calculate the unused GCIs on the PMC modules2 Calculate the unused PMC resources3 Calculate the unused GDS resources for 64K / 32K / 16K

4 Calculate the Max configurable 64K / 32K / 16K resources due to PMC restrictions5 Calculate the Max configurable PDTCHs for 64K / 32K / 16K


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Unused GCIs on the PMC modules

Unused GCIs on PMC 0(2 GDSs)

total GCIs on PMC 0 4 * #64K TS

= 124 * 2 4 * 8= 248 32

= 216

Unused GCIs on PMC 1 (1 GDS)

total GCIs on PMC 1 2 * #32K TS - # 16K TS

= 124 0 81= 43


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Unused GDS resources for 64K / 32K / 16K

Unused GDS resources for 64K

(Unused GCIs on PMC 0(2 GDSs) + Unused GCIs on PMC 1 (1 GDS))/4

216/4 + 43/4 = 64


(Unused GCIs on PMC 0(2 GDSs) + Unused GCIs on PMC 1 (1 GDS))/2

216/2 + 43/2 = 129


Unused GCIs on PMC 0(2 GDSs) + Unused GCIs on PMC 1 (1 GDS)

216 + 43 = 259


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Unused PMC resources

Unused PMC resources on PMC0

124 (2 * #64K) (2 * #32K) - #16K

= 124 16 0 0 = 108

108 54 available for 64K/32K, or 108 for 16K

Unused PMC resources on PMC1

124 - (2 * #64K) (2 * #32K) - #16K

= 124 0 0 81 = 43

43 21 available for 64K/32K, or 43 for 16K


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Max configurable 64K / 32K / 16K resources due to PMC restrictions

Max Configurable 64K due to PMC restrictions

Min(108/2,216/4)+Min(43/2,43/4) =

54+10=64


Min(108/2,216/2)+Min(43/2,43/2)

54+21=75


Min(108,216)+Min(43,43)

108+43=151


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Max configurable PDTCHs for 64K / 32K / 16K

Provisioned PRP PDTCHs - Requested PRP PDTCHs = 240 89 = 151

Max Configurable PDTCHs for 64K

min[(Provisioned PRP PDTCHs - Requested PRP PDTCHs), Max Configurable 64K due to PMC restrictions]

min(151, 64) = 64



min(151, 75) = 75



min(151, 151) = 151


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PRP DPROC Cell Mapping


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disp_bss

[21/04/05 13:26:19] MMI-RAM 0119 -> disp_bssOPER STATES: D:Disabled E:Enabled B:BusyADMIN STATES: L:Locked U:Unlocked E:Equipped NE:Not Equipped S:Shutdown

Status for BSS 1:

SITE FU STATUS GSM CELL ID FREQ BCCHSITE STATE "LOSS OF" MCC MNC LAC CI LCI RAC TYPE FREQ------ ----- --------------- ----------------------------------- --- ---- ------- ----0 B-U Service

PCU_0 B-U Capacity

PCU_1 B-U CapacityPCU_2 B-U Capacity8 B-U Capacity

CLEAR 543 21 61713 (F111h) 138 (008Ah) 0 2 PGSM 83Service 543 21 61713 (F111h) 139 (008Bh) 1 2 DCS1800 820Service 543 21 61713 (F111h) 140 (008Ch) 2 2 DCS1800 830Service 543 21 61713 (F111h) 141 (008Dh) 3 2 DCS1800 840

22 B-U CLEARCLEAR 543 21 61713 (F111h) 34 (0022h) 5 1 PGSM 20


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PRP_PD_DEMAND


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TOTAL_GCI_FOR_PD_DEMAND


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GPRS Statistics & Enhancements

FR 22577


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Feature Overview


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Feature Overview


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Statistics

Packet Congestion

Packet congestion may be measured by use of a key statistic, GPRS CellCongestion.

BLER

The Block Error Rate (BLER) indicates the quality of the radio link and has directimpact on the user throughput.

BLER is affected by three factors: Each individual carrier has its own quality of transmission Each coding scheme uses different algorithm to prevent errors from happening. A

higher coding scheme tends to have a higher BLER In GPRS system, different mechanisms are used for downlink and uplinktransmission, and therefore the quality is different for the same carrier in differentdirections

Packet LossPacket loss is defined as the number of lost Protocol Data Unit (PDU) at LLC level.

Causes can be link quality, buffer availability, and cell reselection etc


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Statistics

LLC Traffic ReportLLC data frames are exchanged between PCU and SGSN over the Gb links.Tracks the number of frames sent/received by PCU and indicate the data traffic at

LLC level.

Uplink LLC frames received are those frames correctly assembled from RLC data

blocks sent by the mobile.Downlink LLC frames received in a given cell are obtained in two ways:

1) frames coming from SGSN over a Gb link; 2) frames coming from another cell due to cell reselection targeted to this cell.

Paging load

The number of PS and CS pages that are received over the Gb links

User ThroughputUser throughput is the data rate at which the end user receives useful information

RLC Traffic ReportThese statistics help to measure RLC data blocks transmission efficiency andidentify the causes of retransmission.


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disp_stat_propdisp_stats

stat_mode

chg_stat_prop

disp_enable_stat



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The following parameters are introduced in this feature:




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GPRS_CELL_CONGESTIONTBF_ SESSIONSDL_BLER_CSX

UL_BLER_CSXDL_BLER_MCSXUL_BLER_MCS9


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PDU_DISCARD_FRPDU_DISCARD_LLCDL_LLC_FRAMES_GBDL_LLC_FRAMES_PCU

UL_LLC_FRAMESPS_PAGE_REQSCS_PAGE_REQSPACCH_PAGE_REQSTBF_DL_ASGN_PACCHTBF_REL_PACCH_LOST

CS1234_ON_64K_CHAN


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There is one modified statistics associated with this feature

RBER

The following statistics are deleted as a result of this feature

UL_PDTCH_CONGESTIONDL_PDTCH_CONGESTIONGBL_LINK_INS

GPRS CELL CONGESTION


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GPRS_CELL_CONGESTION

Percentage of E/GPRS timeslot resources that is in use within a cell


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TBF_SESSIONS

Average and max TBFs on a PRP board


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DL_BLER_CSX


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UL_BLER_CSX


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DL_BLER_MCSX


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UL_BLER_MCSX

PDU DISCARD FR


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PDU_DISCARD_FR

Number of UL/DL PDU frames discarded by Frame relay due to different reasons

PDU DISCARD LLC


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_ _

Number of downlink LLC frames discarded by PCU buffer

overflow, cell reselection, abnormal TBF release

DL LLC FRAMES GB


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DL_LLC_FRAMES_GB

Number of LLC frames correctly received from SGSN

DL LLC FRAMES PCU


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DL_LLC_FRAMES_PCU

DL LLC frames received from another cell of same PCU

UL LLC FRAMES


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UL_LLC_FRAMES

Number of LLC frames correctly assembled from RLC blocks for

transmission to SGSN

PS PAGE REQS


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PS_PAGE_REQS

Number of packet switched page requests received by

PCU per GBL

CS PAGE REQS


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CS_PAGE_REQS

Number of CS page requests received by PCU per GBL ( GS interface)

PACCH PAGE REQS


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PACCH_PAGE_REQS

Number of CS & PS page requests by PCU using PACCH channel whenmobile is in packet transfer mode.

TBF DL ASGN PACCH


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_ _ _

Number of PDAs sent by PCU using the PACCH channels when mobile is inpacket transfer mode with an uplink TBF only.

TBF REL PACCH LOST


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_ _ _

TBFs released due to demand for circuit switched resources

CS1234_ON_64K_CHAN


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Percentage of GPRS blocks against total GPRS/EGPRS

blocks carried by 64K Trau channels


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NACC - Network Assisted Cell Change

FR 222708 & FR23706

Feature Overview


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In the current system, there are performance degradations seen when theMS performs autonomous cell reselections

MS has limited information available to determine which cell to reselect to.

Performance degradation if the target cell is congested.

MS has to read System Info messages on the target cell before accessing

the target cell.

Feature Overview


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2.5 - 15 secsTotal time of interruption

< 1 secsTBF establishment (DL)

2 - 5 secsInter-LA cell change (add. LA Update)

2 - 4 secsInter-RA cell change (RA Update)

0.5 - 1 secsIntra-RA cell change (Cell Update)

Update Procedures ( MS need not perform a1l the procedures)

2 - 5 secsReading of System Information in the target cell after terminating TBF in the source cell



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chg_element

disp_element

stat_mode

disp_enable_stat

disp_stat_prop

disp_stats chg_stat_prop




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There are new parameters introduced in this feature:

nacc_enabled

gprs_type5_alg





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NUM_CELL_RESEL_NEINUM_CELL_RESEL_CELLNUM_CELL_RESEL_CELL_PCCNNUM_CELL_RESEL_CELL_SUCCNUM_CELL_RESEL_NEI_SUCCNUM_CELL_RESEL_NEI_PCCNPACKET_SYSINFO_REQPACKET_SYSINFO_RESP



Network Assisted Cell Change


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change_element nacc_enabled bsc

* 0 = NACC off1 = NACC on

Procedure 1 - PCCN

MSBSS

PCCN

PCCC

PNCD

Procedure 2 Neighbour Cell Data

Network Assisted Cell Change


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BSS considerations:

If the neighbour cell is internal or external to the BSS

RxLev measurements of the serving and neighbour cell as reported by the MS

Congestion level in the target cells

EGPRS/GPRS availability on the target cells

Whether the target cells are in the same routing area

Whether the target cells are on the same PRP Board

Whether the proposed target cell/neighbour cell is a macro or a micro cell

If the neighbour cell is within the same PCU

Network Assisted Cell Change CCN Mode


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Before a MS can use the NACC feature it must be aware that it is

supported in the cell.

This is achieved by broadcasting CCN_ACTIVE in system informationmessages.

MS must be R4 compliant

Conditions for a MS to enter CCN mode

Network indicates CCN_ACTIVE

MS is in NC0, Extended NCO, NC1 or Extended NC1

MS is in packet transfer mode

Network Assisted Cell Change Message Flow


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MSBSS

PCCN

PCCC

PNCD

MSBSS

PCCN

PCCC

MSBSS

PCCN

PCCO

PNCD

1. MS Chosen Cell is theBest Candidate Information Available

2. MS Chosen Cell is theBest Candidate Information Not Available

3. MS Chosen Cell is not theBest Candidate Information Available

Network Assisted Cell Change Message Flow


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MSBSS

PCCN

PCCO

PNCD

PMO(NC2)

PMR(s)

MSBSS

PCCN

PCCO

4. MS Chosen Cell is not theBest Candidate Information Not Available 5. No Cell Change Required

NACC Timers


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MSBSS

PCCN

PCCC/PCCO

PNCD

T 3208=0.96s

T 3206=0.4s

T 3210=0.3s

PCCNretransmitted

MS detects

the need toperformNACC

MS performsautonomous

cell

reselection ifPCCC/PCCOnot received

T3206

stopped if

PNCD /

PCCC/PCCO/PMO

received

Packet (P)SI Status Procedure


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BSS MS

Request for System Info

Response with System Info

Essentially when a MS moves to a new cell, it must receive a set of messagebefore it can begin transfer of data. To prevent the MS waiting for thesemessage, the MS may request information that it has failed to acquire.

The network will then respond with the required system information.

Packet SI status Procedure (PBCCH not enabled)


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MSBSS

PacketSIStatus

PacketServCellData

Allows MS to request additional sysinfo after entering packet transfer mode

Packet PSI status Procedure (PBCCH enabled)


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MSBSS

PacketPSIStatus

PacketServCellData-1

:PacketServCellData-n

GPRS Type 5 Algorithm options


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GPRS Type 5 Algorithm


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location

1 = enabled

Algorithm moves the stationary users in the network that can see a MICRO cell to

the micro cells so as to free up more bandwidth on the MACRO layer.Cell reselection will only be triggered if the target neighbour micro cell has

continuously qualified for a predefined period.

The algorithm for cell reselection from the macro to micros or small macros, isspeed sensitive to avoid repeated cell reselections for fast moving mobiles.

GPRS Type 5 Algorithm


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How the system will apply this algorithm will depend upon the settings of the following

features:

PBCCH must be unrestrictedNCCR must be unrestrictedNACC must be unrestrictedGSM micro cellular algorithm feature (must be enabled for it to be applied in anysituation)

Under this feature congestion may be controlled for both Mobile stations in both the

standby and ready state.

LLC Boundary Detection Algorithm


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NUM_CELL_RESEL_CELL

Total number of PCCC/PCCO attempts to a cell due to congestion relief or


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p gRF based cell reselection

NUM_CELL_RESEL_NEI

Total number of PCCC/PCCO attempts to a neighbor cell due tocongestion relief or RF based cell reselection


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co gest o e e o based ce ese ect o

NUM_CELL_RESEL_CELL_PCCN

Total number of PCCN requests by MS


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NUM_CELL_RESEL_CELL _SUCC


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NUM_CELL_RESEL_NEI_SUCC


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NUM_CELL_RESEL_NEI_PCCN

Total number of PCCN attempts by MS to a neighbor cell on a per


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neighbor cell basis

PACKET_SYSINFO_REQ

MS requests for BCCH/PBCCH GPRS sys info on a per cell basis.


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PACKET_SYSINFO_REQ_RESP

BSS responses to MS requests for BCCH/PBCCH GPRS sys info on per cell basis


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Versa Trau

FR 23769

Feature Overview


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E1 Backhaul



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modify_value

disp_eq disp_rtf_chan

stat_mode

disp_enable_stat

disp_stat_prop

disp_stats

chg_stat_prop




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There is a new parameter introduced in this feature:

rtf_ds0_count





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UL_EGPRS_BACKHAUL_USEDUL_EGPRS_BACKHAUL_DEMANDDL_ EGPRS_BACKHAUL_USED

DL_ EGPRS_BACKHAUL_DEMANDEGPRS_64K_CHANNEL_WIDTH



Versa TRAU


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Recommended DS0 / Versa TRAU Carriers


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Versa TRAU Considerations


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disp_rtf_chan

MMI-RAM 0115 -> disp_rtf_channel 1 0 0


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Start of report for RTF 0 0 at location 1:Packet Radio Capabilities: 64kRTF currently capable of supporting EGPRS?: YESTIMESLOT GPRS TYPE SUB-CHAN STATE0 (BCCH) N/A 0 ACTIVE1 (TCH/F) N/A 0 ACTIVE

2 (TCH/F) N/A 0 ACTIVE3 (TCH/F) N/A 0 IDLE4 (TCH/F) N/A 0 IDLE5 (TCH/F) N/A 0 IDLE6 (64k PDTCH) Switchable 0 N/A

7 (64k PDTCH) Reserved 0 N/A

DS0 CONFIG STATUS0 GSM ACTIVE1 GSM IDLE2 N/A UNUSED

3 GPRS ACTIVE4 GPRS ACTIVE

TS STEALING ALGORITHM

PD PD PD PD PD PD PD PD

PD PD PD PD PD PD PD PD


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ds0-5 ds0-4 ds0-3 ds0-2 ds0-1ds0-5 ds0-4 ds0-3 ds0-2 ds0-1

Initial configuration 8 switchable PDCHs

TCH PD PD PD PD PD PD PD

ds0-5 ds0-4 ds0-3 ds0-2 ds0-1

One TS stolen for voice

TCH TCH TCH TCH TCH PD PD PD

ds0-5 ds0-4 ds0-3 ds0-2 ds0-1

5th TS stolen for voice

UL_EGPRS_BACKHAUL_USED


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UL_EGPRS_BACKHAUL_DEMAND


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DL_EGPRS_BACKHAUL_USED


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DL_EGPRS_BACKHAUL_DEMAND


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EGPRS_64K_CHANNEL_WIDTH


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Documents

GSR8 GPRS Features