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B9-B10 Telecom Evolution - Page 1All Right s Reserved 2007, Alcatel-Lucent

All rights reserved 200 7, Alcatel-Lucent

Evolium BSS - B9-B10 Telecom Evolution

Evolium BSS

B9-B10 Telecom Evolut ion

TRAINING MANUAL

3FL12786AAAAWBZZA1Edit ion 01

Copyright 2007 by Alcatel-Lucent - All rights reserved

Passing on and copying of t his document, use andcommunication of its contents not permitted withoutwritten authorization from Alcatel-Lucent


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All Rights Reserved Alcatel-Lucent 2007Evolium BSSB9-B10 Telecom Evolut ion

3

Table of Contents

n Swit ch t o notes view!1. telecom improvements

Module 1. B9 B10 Telecom Mult iple CCCH

Module 2. B9 B10 Telecom Dual Transfer Mode

Module 3. B9 B10 Telecom 2G-3G Mobil it y Improvements

Module 4. B9 B10 Telecom Extended Dynamic All ocation

Module 5. B9 B10 Telecom Abbreviat ions


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Table of Contents [cont.]

n Swit ch t o notes view!

This page is left blank intentionally


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5

Course Obj ect ives


Welcome to B9-B10 Telecom Evolution

Aft er successful complet ion of this course, you should understand :

n In CSdomain:n - Mult iple CCCHn In PS domain:n - Extended Dynamic Allocati onn - DTMn - 2G-3G synergies:n *Support of CPICH Ec/ No and CPICH RSCP for 2G to 3G cel l re-select ionn *Fast 3G re-select ion at 2G CScall release


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7

About this Student Guide

n Swit ch t o notes view!Conventions used in this guide

Where you can get fur ther informat ion

If you want further information you can refer to the following:

Technical Practices for the specific product

Technical support page on the Alcat el website: http:/ / www.alcatel-lucent .com

Note

Provides you wit h addit ional inf ormation about t he topic being discussed.

Alt hough t his informati on is not requir ed knowledge, you might f ind i t useful

or interest ing.

Technical Reference(1) 24.348.98 Point s you to t he exact sect ion of Alcat el-Lucent TechnicalPractices where you can fi nd more inf ormati on on t he topic being discussed.

WarningAlert s you to inst ances where non-compliance could result in equipmentdamage or personal injury.
http://www.alcatel-lucent.com/http://www.alcatel-lucent.com/


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8

About this Student Guide [cont.]




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9

Self-Assessment of Obj ect ives

n At the end of each section you will be asked to fill this questionnaire

n Please, return this sheet to the trainer at the end of the training

n

Swit ch t o notes view!

Inst ructi onal object ivesYes (orglobally

yes)

No (orglobally

no)Comments

1

2

Contract number :

Course title :

Cli ent (Company, Center) :

Language : Dates f rom : to :

Number of t rainees : Locat ion :

Surname, First name :

Did you meet t he fol lowing object ives ?

Tick the corresponding box

Please, return this sheet to the trainer at the end of the training

"


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10

Self-Assessment of Obj ect ives [cont.]


Inst ructional objectivesYes (orGlobally

yes)

No (orglobally

no)Comments

Thank you for your answers to t his quest ionnaire

Other comments

"


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All rights reserved 2007, Alcatel-Lucent

Evolium BSS - B9-B10 Telecom Evolution

Module 1B9 B10 Telecom Mult iple CCCH

3FL12786AAAAWBZZA1 Edit ion 01

Sect ion 1telecom improvements


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All Rights Reserved Alcatel-Lucent 2007Evolium BSSB9-B10 Telecom Evolution

12

Blank Page


First edit ionLast name, firstname

YYYY-MM-DD01

RemarksAuthorDateEdition

Document History


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13

Object ives

Describe the purpose of the "Multiple CCCH" feature and itsO&M impacts


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Object ives [cont.]



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15

Table of Contents

Swit ch t o notes view! Page

1 What Is the Purpose of this Feature? 7

2 How Does It Work? 103 What Are the O&M Impacts? 17


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1 What Is the Purpose of this Feature?


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18


Principles in B9

n The Common Control CHannel (CCCH) can only carry the signaling of alimited number of mobiles. The signaling bandwidth is not large enough

to support more CS and PS traffic.

CCCH

Cell with CS and PS traffic

A single CCCHcannot support the

signaling load!

Base Station


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19


Principles in B10

n The mult iple CCCH enables to support t he increasing signaling load ofcell s with high CS and PS t raff ic t hroughput. Indeed, t he int roduction of

multiple CCCH increases the signaling bandwidth on the Air interface.

CCCH

Cell wit h CS and PS t raff ic

Base Station

CCCHAir

The signaling load of all the mobilesis support ed by t he mul t iple CCCH!


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2 How Does It Work?


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26

2 How Does It Work?

Mult iple CCCH Descript ion

n To increase the signaling bandwidth on the Air interface, 3GPP definesup to 4 time slots to carry the CCCH information (TS0, TS2, TS4 and

TS6). The Alcatel-Lucent solution supports multiple CCCH on TS0 andTS2 in G2 BSCs and MX BSCs.

Duplicationof the

SI message

The cell paging capacit yreaches up to 60 pagingmessages per second.

With multiple CCCH,the System Information message

is broadcast on bothTS0 and TS2.

TS0 TS1 TS2 TS3 TS4 TS5 TS6 TS7

SI

A mobile t erminal in idle mode belongs to a CCCH_GROUP (t o l isten to paging messages or make random

accesses). Each CCCH_GROUP is mapped to a specif ic TN (TS0 and TS2). To determine i ts ownCCCH_GROUP, a mobile t erminal perf orms a computation based on the IMSI.

Formula:

CCCH_GROUP (0 .. BS_CC_CHANS-1) = ((IMSI mod 1000) mod (BS_CC_CHANS x N)) div N

Where:

BS_CC_CHANS = number of basic physical channels support ing Common Cont rol CHannels (CCCHs).

N = number of paging blocks "avail able" on one CCCH = (number of paging blocks "available" i n a 51-mult if rame on one CCCH) x BS_PA_MFRMS.

BS_PA_MFRMS = number of 51-mult if rames between transmissions of paging messages to mobiles in idle

mode of the same paging group. IMSI = Int ernat ional Mobil e Subscriber Ident it y, as defined in 3GPP TS 23.003.

mod = Modulo.

div = Integer division.

The fol lowing table gives the relat ionship between the CCCH_GROUP number and the Time slot Number(TN).

21

00

TNCCCH_GROUP


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27

3 What Are the O&M Impacts?


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28


Configurat ion Rules

n The CBC and CBH modes are forbidden.

n The CCH mode is only allowed on Evolium BTSs.

n The CCH mode should be configured on TS2 of the beacon TRX.

n Up to 176 SDCCH subchannels are allowed in t he cell when the CCHmode is enabled (ot herwise the limit is 88 SDCCH subchannels as in B9).

n Only 1 SDC/SDH must be added on a beacon TRX in multiple CCCH mode.

n There must be no SDD on a beacon TRX in multiple CCCH mode.

New templatesare defined formul t ipl e CCCH.

TRE Hardware Limitation

The maximum is reached in single CCCH mode.

G3: maximum number of CCCH + SDCCH TSs = 3

G4: maximum number of CCCH + SDCCH TSs = 4

G5 (TWIN TRA): maximum number of CCCH and SDCCH TSs = 4

TRX Configurat ion Limit ation

The limit ati on on the OMC is maximum 3 SDCCHs per TRX.

TCU Limi tation

A TCU can cope with the load equivalent to 4-TSsignaling channels (SDCCH or CCCH). The number ofSDCCHs on each TCU needs to be reduced in case of mult iple CCCH.

The rule should be:

N_TS_CCCH + N_TS_SDCCH


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29


New Counters

n Performance management

l New PM counters and indicators: C8A, C8B, C8C, C8D

n Radio counters

l New BTS count ers:

o NB_BUSY_RACH_SLOTS

o NB_ASSIGN_CMB_RECEIVED_ABIS

o NB_ASSIGN_CMD_DISCARDED

o NB_PAGING_CMD_RECEIVED_ABIS

o NB_PAGING_CMD_DISCARDED

C8A, C8B, C8C, C8D:

These PM count ers are provided for all CCCH TSs of the beacon TRX.

NB_BUSY_RACH_SLOTS (MC925C):

Number of busy RACH slot s.

NB_ASSIGN_CMD_RECEIVED_ABIS (MC925E):

Number of 48.058 IMMEDIATE ASSIGN COMMAND messages received by t he BTS on Abis, t hat must be sentto the mobile t erminal for CS and PS t raff ic.

NB_ASSIGN_CMD_DISCARDED (MC925F):

Number of 48.058 IMMEDIATE ASSIGN COMMAND messages received by the BTS on Abis and discarded incase of congest ion.

NB_PAGING_CMD_RECEIVED_ABIS (MC925G):

Number of 48.058 PAGING COMMAND messages received by the BTS on Abis, that must be sent to themobile t erminal f or CS and PSt raff ic.

NB_PAGING_CMD_DISCARDED (MC925H):

Number of 48.058 PAGING COMMAND messages received by t he BTS on Abis and di scarded in case ofcongest ion.


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Summary

n The "Multiple CCCH" feature offers a larger signalingbandwidth on the Air interface.

n The Alcatel-Lucent solut ion support s multiple CCCHon TS0 and TS2 in G2 BSCs and MX BSCs.

n In mul t iple CCCH mode, SI messages are broadcast onboth TS0 and TS2.

n The following rules apply as regards mult iple CCCH configurat ion rules:l The CBC and CBH modes are forbidden.

l The CCH mode is only allowed on Evolium BTSs.

l The CCH mode is configured on TS2 of the beacon TRX.

l Up to 176 SDCCH subchannels are allowed in the cell when t he CCH modeis enabled (ot herwise the limit is 88 SDCCH subchannels as in B9).

l Only 1 SDC/SDH can be added on a beacon TRX in multiple CCCH mode.

l There must be no SDD on a beacon TRX in multiple CCCH mode.


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End of ModuleB9 B10 Telecom Mult iple CCCH


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Object ives

Describe the purpose of the "Dual Transfer Mode" feature,its O&M and telecom impacts


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38

Table of Contents



2 How Does It Work? 103 What Are the Telecom Impacts? 224 What Are the O&M Impacts? 27


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45

2 How Does It Work?

Reminder on Mult islot Class

NAxx119 to 29 like 10

000NA88218

011NA77217

121NA66216

131NA55215

131NA44214

131NA33213

121544112

121534111

121524110

12152319

12151418

13143317

13142316

13142215

13141314

13232213

13231212

24221111

TrbTraTtbSumTxRxTypeMult islot Class

MS Type

Type-1 MSs are simplex MSs, i .e. , wit hout duplexer: they are not able to transmit and receive at t he same t ime.

Type-2 MSs are duplex MSs, i. e., with duplexer: t hey are able to transmit and receive at the same time.

Rx

The maximum number of received t ime slots that the MS can use per TDMA frame. The received TSs must beall ocated within window of size Rx, but they do not need to be cont iguous. For SIMPLEX MS, no t ransmit ted TS mustoccur between received TSs wit hin a TDMA frame. This does not take int o account the measurement window (Mx).

Tx

The maximum number of t ransmit ted t ime slots that the MS can use per TDMA frame. The t ransmit ted TSs must beall ocated within t he window of size Tx, but they do not need to be conti guous. For SIMPLEX MS, no received TS mustoccur between tr ansmit ted TSs within a TDMA frame.

Sum

The maximum number of t ransmit ted and received time slots (wi thout Mx) per TDMA frame.

Meaning of Tfb, Tra and Trb according to t he MS Type

For SIMPLEX MS (type 1):

Ttb is the minimum t ime (i n t ime slot ) necessary between the Rx and Tx windows.

Tra is the minimum t ime between the last Tx window and the f irst Rx window of t he next TDMA in order t obe able t o open a measurement window.

Trb i s the same as Tra without opening a measurement window.

For DUPLEX MS (type 2):

Ttb is the minimum time necessary between 2 Tx windows belonging to different f rames.

Tra is the minimum t ime necessary between 2 Rx windows belonging to dif ferent f rames in order t o be ableto open a measurement window.

Trb i s the same as Tra without opening a measurement window.


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46

2 How Does It Work?

Radio Allocation Constraints

n Class 4 (3+1)

0 1 2 3 4 5 6 7

0 1 2 3 4 5 6 7

Ttb Tra

Rx Rx Rx Mx

Tx

DL

UL

n Class 8 (4+1)

0 1 2 3 4 5 6 7

0 1 2 3 4 5 6 7

Ttb Tra

Rx Rx Rx Mx

Tx

Rx DL

UL

MS Type

Type-1 MSs are simplex MSs, i .e. , wit hout duplexer: they are not able to transmit and receive at t he same t ime.

Type-2 MSs are duplex MSs, i. e., with duplexer: t hey are able to transmit and receive at the same time.

Rx

The maximum number of received t ime slots that the MS can use per TDMA frame. The received TSs must beall ocated within window of size Rx, but they do not need to be cont iguous. For SIMPLEX MS, no t ransmit ted TS mustoccur between received TSs wit hin a TDMA frame. This does not take int o account the measurement window (Mx).

Tx

The maximum number of t ransmit ted t ime slots that the MS can use per TDMA frame. The t ransmit ted TSs must beall ocated within t he window of size Tx, but they do not need to be conti guous. For SIMPLEX MS, no received TS mustoccur between tr ansmit ted TSs within a TDMA frame.

Sum

The maximum number of t ransmit ted and received time slots (wi thout Mx) per TDMA frame.

Meaning of Tfb, Tra and Trb according to t he MS Type

For SIMPLEX MS (type 1):

Ttb i s the minimum time (in t ime slot) necessary between the Rx and Tx windows.

Tra is the minimum t ime between the last Tx window and the f irst Rx window of t he next TDMA in order t o beable t o open a measurement window.

Trb is the same as Tra wit hout opening a measurement window.

For DUPLEX MS (type 2):

Ttb is the minimum t ime necessary between 2 Tx windows belonging to dif ferent f rames.

Tra is the minimum t ime necessary between 2 Rx windows belonging to different f rames in order t o be able t oopen a measurement window.

Trb is the same as Tra wit hout opening a measurement window.


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48

2 How Does It Work?

Definitions

n Can you find the definitions of each of the following terms?Mat ch each t erm on the left wit h it s definit ion on the right .

The MS is not allocated any radio resource on a packet dataphysical channel. It li stens to the PBCCH and PCCCH or, i f thoseare not provided by the network, to the BCCH and the CCCH

The MS is allocated radio resources on one or more packet dataphysical channels for the transfer of LLC PDUs

Main DCCH

Dual Transfer Mode(DTM)

Temporary Block Flow(TBF)

A physical connection used by the 2 RR peer entities to supportthe unidirect ional t ransfer of LLC PDUson packet data physicalchannels

The SDCCH or FACCH in dedicat ed mode

Dedicated mode

Packet Transfer Mode(PTM)

Packet Idle mode The MS is allocated at least 2 dedicated channels, only one ofthem being an SACCH

The MS is allocated radio resources providing an RR connectionand a TBF on one or more physical channels


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52

2 How Does It Work?

RR Procedures: Packet Resource Release

n In the case of the release of the RR connection while in dual t ransfermode, the MS must abandon the packet resource and, once in idle

mode and packet idle mode, it may start a new establishment.n What happens when switching from DTM to PTM? Let 's assume t he MSis

in PTM. There is a voice call and a packet data transfer in progress.After a while, the voice call is terminated whereas the packet datatransfer continues.

1. Release TCH and abort TBF(s)

2. Establish TBFs in PTM

DTM

Idle

PTM

TCH andTBF(s) release

TBF(s)establishment

The release of a TBF must follow t he procedures defi ned in 3GPP TS44.060.


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56


Supported MS Mult islot Classes in B10

n In release 99:

l MS class 5 (1 TCH, 1 PDCH)

l MS class 9 (1 TCH, 2 PDCHs DL, 1 PDCH UL)

Possible Time Slot Patt erns for DTM Mult islot Classes 5 and 9

DL

UL

DL

UL

Class 5

Class 9

Timeslot for t he PS part (PDCH/ F)

Timeslot for the CS part (TCH/ H or TCH/ F)

or

or

Extended Dynamic Allocation (EDA) allows to support DTM t imeslot configurat ions with more than one

PDCH in UL.

Single slot allocation (not support ed in B10): 1 TS shared bet ween CS and PS (TCH/ H + PDCH/ H).

Extended DTM mult islot classes: TCH/ H + PDCH/ H + PDCH/ F configurat ion (not support ed in B10).

Addit ions in Rel.4: MSclass 11 (1 TCH, 1 PDCH DL, 2 PDCHs UL, wi th EDA).


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57


Paging Coordination

State of a

GPRS-at tached DTMmobile station

CS paging PS paging

In packet idle modePCH if no PCCCH

PPCH if PCCCH

PCH if no PCCCH

PPCH if PCCCH

In packet t ransfer mode PACCH NA

In dedicated mode NA Main DCCH

In dual transfer mode NA NA

Principles:

PS paging coordination: a DTM-capable MSmust receive PSpagings while in CSto request DTMestablishment.

CS paging coordinat ion: a DTM-capable MS must receive CSpagings while in PTM to switch to dedicatedmode (and possibly re-establish TBFs in DTM).

Consequences:

CS paging coordinat ion: through the Gs interf ace. No coordinat ion in the BSS.

PS paging coordinat ion: through t he sharing of MS DTM cont ext s between BSC and MFS.


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End of ModuleB9 B10 Telecom Dual Transfer Mode


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Object ives [cont.]



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Table of Contents



2 How Does It Work? 103 What Are the Telecom Impacts? 25


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2 How Does It Work?


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2 How Does It Work?

Fast 3G Reselect ion at 2G CS Call Release: Principles in B9

n In B9, an MS in a 2G cel l which ends a CS call start ed in a 3G cel l:

1. performs an LA/ RA update to camp on the 2G cell ,

2. reselects the 3G cell,3. performs an LA update to camp on the 3G cell.

2G cell 3G cell2G cell 3G cell

LA a LA b

I amPeter

in LA b

I amPeter

in LA aChannelrelease

1

2

3

The init ial strategy for many 2G/ 3G operators seems to be to priori t ize 3G in cell reselect ion for 2G/ 3G

capable MSs, and to handle cal ls on 3G whenever possible. The 3G to 2G int erworking is primaril y used toavoid calls from dropping when 3G coverage becomes poor.

According to the current specification, when t he MSreleases all TCHs or SDCCH and ret urns to idlemode or packet i dle mode, it shall , as quickly as possible, camp on the cell whose channel has j ust beenreleased (GSM 45.008 6.7.1. ). So, the terminal camps on this last GSM cell.

However, the call could have been established initially in the 3G cell or in a 2G cell which may bedifferent from the 2G cell in which it starts the call (in case an internal handover occurs between 2 cellsof the same BSS). So the MSC is not aware of the new LA. In such a case, t he mobile station may need toperform an LA/ RA update. Then the cell reselect ion procedure would move the MS back to a 3G cell . As2G and 3G cells should normally be in different l ocat ion/ routi ng areas, then the MS wil l have to performanother LA Update / RA Update.

As this may become a behavior seen in many networks, an enhancement has been int roduced in Rel-6,where a terminal, if ordered by the network, directly selects a 3G cell (or other 2G cell). The terminal issignaled t he net works pref erence in t he CHANNEL RELEASE message.

This saves the signaling and t ime needed for unnecessary LA Update / RA Update.


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2 How Does It Work?

Fast 3G Reselect ion at 2G CS Call Release: Principles in B10

n In B10, when an MS ends a call in a 2G cell, the cell to reselect can beindicated t o the MS in t he Channel Release message.

n No useless LA update is perf ormed anymore. The 3G reselect ion isspeeded up.

2G cell 3G cell XX2G cell 3G cell XX

LA a LA b

ZZ

ZChannelrelease

Cell(s)t

oresele

ct=

XX


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2 How Does It Work?

Refined Criteria for 2G-to-3G Handover: Principles in B9

n In B9, 2G-t o-3G HOs are systemat ic for voice t raff ic even if the 2G cellis not loaded.

The 2G cell is loaded:

the MS performs a 2G-t o-3Ghandover.

The 2G cell is not loaded:

the MS performs a 2G-t o-3Ghandover too!

2G cell 3G cell 2G cell 3G cell


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2 How Does It Work?

Refined Criteria for 2G-to-3G Handover: Principles in B10

n In B10, the MS decides to perform 2G-t o-3G HOs depending on the loadof the 2G cell.

The 2G cell is not loaded:

the MS stays in the 2G cell!

The 2G cell is loaded:

the MS performs a 2G-to-3Ghandover.


The "2G_3G_HO_Allowed" variable is set to "allowed" or "forbidden" depending on the cell load computed

by t he BSC. This cell load is compared to a new paramet er (THR_CELL_LOAD_3G_REQ).


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84

2 How Does It Work?

TD-SCDMA to 2G Handover and Reselect ion: Principles in B10

n The f irst Time Division-Synchronous Code Division Mult ipleAccess (TD-SCDMA) network has been implement ed in

China.n In B10, HOs and reselect ions coming from TD-SCDMA

networks have no impact on the BSS.

Incoming reselectionf rom the TD-SCDMA network

wit hout constraint

Incoming HOf rom the TD-SCDMA network

wit hout constraint

2G network3G TD-SCDMA

network 2G network3G TD-SCDMA

network

Bla bla

bla

TD-SCDMA stands for Time Division-Synchronous Code Division Mult iple Access. This third mobile network

generat ion technology is also called 3G TDD. TD-SCDMA is developed and used in China.

A 3G TDD network is equivalent to: a WCDMA network, also cal led 3G FDD and used in Europe and Japan. a CDMA2000 network, used in t he USA.


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2 How Does It Work?

Compressed INTER RAT HANDOVER INFO Element : Principles in B9

n In B9, the INTER RAT HO INFO element is sent by the MSat call establishment time in uncompressed mode.

Segmentation of the message is necessary.

Call establishment

ChannelRequest

ImmediateAssignment

1 2

INTER RAT HO INFO(uncompressed and segmented)

2G network

3

RAT stands for Radio Access Technology (2G or 3G). This informat ion is only useful f or t he RNC. So it is

j ust stored by the BSC then forwarded t o the RNC via t he MSC for 2G-to-3G HO purposes.


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2 How Does It Work?

Compressed INTER RAT HANDOVER INFO Element : Principles in B10

n In B10, the "INTER RAT HO INFO" Element can becompressed.

n Around 700ms are saved at call establishment . SDCCH isunloaded as well.

Call establishment

ChannelRequest

Immediate Assignmentwith

Compressed_Inter_RAT_HO_INFO_IND

1 2

INTER RAT HO INFO(compressed and not segmented)

2G network

3

A compression of the INTER RAT HO INFO Element , agreed by 3GPP Rel-5, has been taken into account . If

the UTRAN network supports the compressed format , t he BSS indicates the MS that i t can compress thisinformation element .

As a result , t ime is saved at call establishment (around 700ms). SDCCH is unloaded as wel l.


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2 How Does It Work?

Load of 2G Provided t o UTRAN if 3G-t o-2G HO Accept ed by BSS: Pri nciples in B9

n In B9, in case of 3G-to-2G HO, the 2G cell load informationis provided to the 3G network only in case of rejection

(t he 2G cell is too much loaded).

2G cell loadedHO rejected

2G cell load information provided

2G cell not loadedHO accepted

2G cell load information NOTprovided

I am too muchloaded (75%)


2G Cell Load Information

This info is made up of 2 elements:

Cell capacit y class (f rom 1 to 100 max) giving an information about the size of the cell in t erms of TCH:

1=> 1TCH, 100=>126 (126 TCH channels in one GSM cell ([ 8 TSs X 16 TRXs] 1 BCCH - 1 SDCCH).

Cell load (f rom 0 to 100%) corresponding to t he last computed Average Traff ic Load.


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2 How Does It Work?

Load of 2G Provided t o UTRAN if 3G-t o-2G HO Accept ed by BSS: Pri nciples in B10

n In B10, even if the 3G incoming HO is accepted, the 3Gnetwork is provided wit h the 2G cell load informat ion.

n The 3G network can anticipate the 2G overload and avoidnext HO failures towards 2G.

2G cell not loadedHO accepted

2G cell load information provided Next HO towards another cell

I am almostover loaded (70%)


2G cell

MS 1MS 2 MS 1

MS 2


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3 What Are the Telecom Impacts?

New Parameter and Values

n Can you associate each parameter or value to the correct B10improvement?

Mat ch each element on t he lef t wit h the appropr iat e B10 improvement on t he r ight.

EN_FAST_3G_Reselect ion

EN_2G_TO_3G_CELL_RESELECTION = 3(Enabled even i f NCO > 1)

EN_COMPRESSED_INTER_RAT_INFO

2G/ TD-SCDMA int eroperabil it ies

2G-to-3G reselection during PTM even if

NC2 is activated

No 2G-to-3G HO if 2G not loaded

TDD_ARFCN_LIST

EN_2G_3G_HO_NO_SERVICE_HO

FDD_RSCPmin INTER RAT HO INFO compressed

3G reselect ion speeded up aft er 2G CS callrelease

3G coverage t aken into account for 2G-3G reselect ion

THR_CELL_LOAD_3G_REQ

EN_2G_TO_3GTDD_CELL_RESELECTION


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94


Cell Reselect ion in PTM from 2G to 3G When NC2 Is Act ivated

n A new value is introduced for the parameterEN_2G_TO_3G_CELL_RESELECTION. When this parameter is set to

3, the 2G-t o-3G cell reselect ion is enabled wit h 3G search act ivatedwhile the MS is in GMM ready state, even if theNetwork_Control_Order > 1 (that is, the NC2 mode is activated).

MFS view

SGSN view

NC2

3G SEARCH

STANDBY STANDBYREADY

PTM PIM

3210EN_2G_TO_3G_CELL_RESELECTION

1NC2_DEACTIVATION_MODE



When EN_2G_TO_3G_CELL_RESELECTION = 3, it avoids the Packet Measurement Order (PMO) to be sent

to the MS, so to activat e NC2 when the Packet Transfer Mode (PTM) start s.

Other already existing (B9) possible values are:

0: Disabled,

1: Enabled with 3G search act ivat ed while t he MS is in GMM ready state,

2: Enabled with 3G search deact ivated whil e t he MSis in GMM ready state.


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96


Cell Reselection in PTM from 2G to 3G When NC2 Is Activated [cont.]



MFS view

SGSN view

NC2

3G SEARCH


PTM PIM








0: Disabled,




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99





MFS view

SGSN view

NC2

3G SEARCH


PTM PIM








0: Disabled,




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100





MFS view

SGSN view

NC2

3G SEARCH


PTM PIM








0: Disabled,




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102


Refined Criteria for 2G-to-3G Handover

n The 2G-to-3G HO decision may depend on 2G load. If the "ServiceHandover" Informat ion Element provided by the MSC is not present at

ASSIGNMENT or HANDOVER REQUEST, then, 2G-to-3G HO depends on 2new parameters.

n Indeed, WHEN:

l EN_2G_3G_HO_NO_SERVICE_HO = 0, THEN 2G-to-3G HO is forbidden.

l EN_2G_3G_HO_NO_SERVICE_HO = 1, THEN:

IF the last N_TRAFFIC_LOAD averages AV_TRAFFIC_LOAD (including the newone), verif y:

AV_TRAFFIC_LOAD > THR_CELL_LOAD_3G_REQ

THEN 2G-3G-HO allowed

ELSE 2G-to-3G HO forbidden

Service Handover Information Element

Missing (not present):

Serving GSM cel l not loaded: Stay in GSM.

Serving GSM cel l l oaded: A paramet er (EN_2G_3G_HO_NO_SERVICE_HO) gives the choice betweenstaying in GSM and t rying an HO to 3G.

"Shall not":


Serving GSM cel l loaded: Stay in GSM.

"Should not":


Serving GSM cel l loaded: Stay in GSM. "Should":

Serving GSM cell not loaded: Try HO to 3G.

Serving GSM cel l loaded: Try HO to 3G.

If THR_CELL_LOAD_3G_REQ = 0, the f eature is disabled. Then, 2G-to-3G HOs are systematic.


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103


Refined Crit eria for 2G-to-3G Handover [ cont .]

n For example, when the Service Handover Information Element is notpresent at Assignment or Handover Request:

l EN_2G_3G_HO_NO_SERVICE_HO = 1l N_TRAFFIC_LOAD = 3

AV_TRAFFIC_LOAD (%)

N_TRAFFIC_LOAD

HO detect ed

THR_CELL_LOAD_3G_REQ

0

20

40

60

80

100

1 2 3 4 5 6 7 8 9


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104


TD-SCDMA Cell Reselect ion f rom 2G to 3G

n To activate the "2G-to-3G TD-SCDMA Cell Reselection" feature, youmust:

l define 3G TDD frequencies at the BSS level with t he TDD_ARFCN_LISTparameter (l ist of up to 3 TDD UARFCNs).

l enable 2G-to-3G TDD cell reselection at the 2G serving cell level with theEN_2G_TO_3GTDD_CELL_RESELECTION parameter.

This parameter has the same behavior asEN_2G_TO_3G_CELL_RESELECTIONused for FDD.

l define the parameters used as criteria by the MSs for cell reselection at the2G serving cell level, as for current 2G to 3G FDD cell reselection

implementation: especially TDD_Qoffset .

TDD_Qoffset : Offset added t o the received level average of t he serving cell and of the neighbor GSM

cells for UTRAN FDD cell reselect ion.

Possible values:

0: -32: Always select a 3G cell if possible 8: 0: 0 dB

1: -28: -28 dB 9: 4: 4 dB

2: -24: -24 dB 10: 8: 8 dB

3: -20: -20 dB 11: 12: 12 dB

4: -16: -16 dB 12: 16: 16 dB

5: -12: -12 dB 13: 20: 20 dB

6: -8: -8 dB 14: 24: 24 dB

7: -4: -4 dB 15: 28: 28 dB (2G cell reselect ion is preferred)

The B10 enhancement allowing 2G-t o-3G cell reselect ion in PTM even when NC2 is act ivated is alsoapplied t o 3G TDD.

So, when EN_2G_TO_3GTDD_CELL_RESELECTION = 3, it avoids Packet Measurement Order (PMO) to besent to the MS, so to activate NC2 when the Packet Transfer Mode (PTM) start s.

Other possible values for t his parameter are:

0: Disabled,




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105


Compressed INTER RAT HANDOVER INFO Element

n This feature is activated through the new parameterEN_COMPRESSED_INTER_RAT_INFO which can be set to:

l 0: disable.

l 1: enable.

Caution

This feature must be acti vated only if all t he neighboringRNCs of this BSS support the feature.


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106

Summary

n An MS can perform a 2G-to-3G cell reselection only ifthe 3G cell coverage is good.

So, the MS takes int o account the CPICH RSCP.

n 3G cell reselection at 2G CS call release enables toavoid double LA update.The cell(s) t o reselect is(are) indicated to the MS ifEN_FAST_3G_Reselect ion is enabled.

n The NC2 mode is not activated in PTM to allow 2G-t o-3G cellreselection during packet transfer. This mode must be activated (new

parameter) only if the 2G cell is well covered by 3G.

n The useless 2G-to-3G HOs are no more performed (2G not loaded). 2new parameters are defined: a flag and a threshold.


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107

Summary [cont.]

n 2G-3G TDD (TD-SCDMA) interoperabil ity is possible:

l Incoming reselection and handover from 3G TDD are

welcome.l 2G-t o-3G TDD reselect ion is possible: a flag and a 3G

TDD cell list are added.

n To speed up call establishment , the INTER RAT HOINFO Element must be compressed. This feature isactivated (new parameter) only if the information isunderstandable by t he RNC.

n The 2G cell load informat ion is always provided t o the 3G networkaft er a 3G-t o-2G HO. So, the 2G overload can be anticipated and anynext HO failure due to reject ion can be avoided.


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108

Self-Assessment on the Obj ect ives

n Please be reminded to fi l l in t he formSelf -Assessment on t he Obj ect ives

for this modulen The form can be found in the first part

of this course documentation


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117


DA Mode

n In B9, during the lifetime of the uplink TBF, the MSneeds to listen tothe downlink PDCHs corresponding to i ts uplink assigned PDCHs. On

one assigned PDCH, whenever the MS detects its USF, it is all owed t ot ransmit on the same uplink PDCH in the next block period. Thisoperat ing mode is called Dynamic All ocation (DA).

PDCH1DL TBF

UL TBF

DL TBF

UL TBF

USF

Data

PDCH2

The monitoring of all the downlink PDCHscorresponding to its uplink assigned PDCHs

allows the MS to support 2 uplink PDCHs maximum.

When an uplink Temporary Block Flow (TBF) is established for a Mobil e Stat ion (MS), the network

provides the MS with the list of the uplink Packet Data Channels (PDCHs) assigned for t hat TBF and thelist of the Uplink State Flag (USF) ident if iers of this TBF. One unique USF is assigned per TBF and perassigned PDCH.


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119

2 How Does It Work?


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123

2 How Does It Work?

GPRS Packet Connect ion Configurat ions

n The EDA mode allows the support of radio configurations with moreupli nk Time Slot s.

MultiSlotclass

Tx[1][3]

Tta TraRx[1][2]

Sum[4]

Ttb TrbSuppor ted GPRS Packet Connect ion conf igurat ions

Sub-opt imal Opt imal

1 1 1 2 3 2 24 No (1+1)

2 2 1 3 3 2 13 (1+1) (2+1)

3 2 2 3 3 2 13 (1+1) (2+1), w/ EDA: (1+2)

4 3 1 4 3 1 13 (1+1), (2+1) (3+1)

5 2 2 4 3 1 13 (1+1), (1+2), (2+1) (2+2)

6 3 2 4 3 1 13 (1+1), (1+2), (2+1) (2+2), (3+1)

7 3 3 4 3 1 13 (1+1), (2+1), (1+2) (3+1), (2+2), [5]

8 4 1 5 3 1 12 (1+1), (2+1), (3+1) (4+1)

9 3 2 5 3 1 12 (1+1), (2+1), (3+1), (1+2), (2+2) (3+2)

10 4 2 5 3 1 12 (1+1), (2+1), (3+1), (2+2), (1+2) (3+2), (4+1)

11 4 3 5 3 1 12(1+1), (2+2), (2+1), (3+1), (1+2),

w/ EDA: (1+3)C(3+2), (4+1), w/ EDA: (2+3)

12 4 4 5 2 1 12(1+1), (2+2), (2+1), (3+1), (1+2),

w/ EDA: (1+3)C(3+2), (4+1), w/ EDA: (2+3), (1+4)


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124

2 How Does It Work?

UL Transmission Principle in DA Mode

n Let us consider an MS in PTM with 2 PDCHs in upl ink. Can you f ind t heradio blocks on which the MS is able to transmit?

Find t he corr ect r adio blocks for each PDCH.

USF USF USF

USFUSFUSF USF

PDCHX

PDCHX+1

DL

UL

DL

UL

When an uplink TBF is established for an MS, the network provides the MS with the list of t he uplink

PDCHs

assigned for that TBF and the list of the USF ident if iers of t his TBF.

On one assigned PDCH, whenever t he MSdetect s it s USF, it is allowed to transmit on the same uplinkPDCH in t he next block period.


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127



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131

Self-Assessment on the Obj ect ives

n Please be reminded to fi l l in t he formSelf -Assessment on t he Obj ect ives

for this modulen The form can be found in the first part

of this course documentation


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132

End of ModuleB9 B10 Telecom Extended Dynamic Allocation


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135

Abbreviat ions and Accronyms

n Swit ch t o notes view!2G second Generat ion3G t hird Generati on3GPP Thir d Generat ion Part nership Proj ect

8-PSK 8-stat e Phase Shif t Keying

AAGCH Access Grant CHannel

BBCC main BCCH modeBCCH Broadcast Cont rol ChannelBSC Base Stat ion Cont rol lerBSCGP Base Stat ion Cont rol ler GPRS Prot ocolBSS Base Stat ion SubsystemBTS Base Transceiver Stat ion

C

CBC mai n combined BCCH modeCBCH Cel l Broadcast ChannelCBH mai n combined BCCH wi th CBCHCCCH Common Cont rol ChannelCCH Cont rol ChannelCDMA Code Division Mul t ip le AccessCMD CommandCPICH Common Pilot ChannelCPICH Ec/ No received energy per chip divided by the power densit y in the bandCS Cir cui t Swit chingCSCN Cir cui t -Swi tched Core Network

D

DA Dynamic All ocat ionDB decibelDCCH Dedicat ed Cont rol ChannelDL DownLinkDTM Dual Transfer Mode

EEDA Ext ended Dynamic Allocat ionEGPRS Enhanced General Packet Radio Service

FFACCH Fast Associat ed Cont rol ChannelFCCH Frequency Corr ect ion ChannelFDD Frequency Division Duplex

GGERAN GSM Edge Radio Access Net workGMM GPRS Mobil it y ManagementGPRS General Packet Radi o ServiceGPU GPRS Packet Uni tGSM Global System for Mobil e communicat ionsGTTP GPRS Transparent Tunnel ing Protocol

HHO HandOverHR Half Rate

IIMSI Internat ional Mobile Subscriber Identi t y


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b 10 Tel Features

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