02 3g rpls2_v2-0 the physical layer

8/3/2019 02 3G RPLS2_v2-0 the Physical Layer

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1 NOKIA topic: The Physcial Layer / July 2003 /Markus Wimmer

The Physical Layer


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Part IChannel Mapping


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Radio Interface Channel Organisation

Logical Channelscontent is organised in separate channels, e.g.

System information, paging, user data, link management

Transport Channelslogical channel information is organised on transport channel

resources before being physically transmitted

Physical Channels(UARFCN, spreading code)

FramesIub interface


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Channel Mapping DL (Network Point of View)

P-CCPCHPCHBCH

CTCHDCCH

CCCH

PCCHBCCH

DCH

CPICHS-SCHP-SCH

FACH

DSCH

CSICHCD/CA-ICH

AICH

PDSCHDPDCH

S-CCPCH

DTCH

PICH

LogicalChannels

TransportChannels

PhysicalChannels

DPCCH


5/7411 NOKIA topic: The Physcial Layer / July 2003 /Markus Wimmer

Channel Mapping UL (Network Point of View)

DCCH

DCH DPDCHTCH

LogicalChannels

TransportChannels

PhysicalChannels

CPCH

RACHCCH

PCPCH

PRACH

DPCCH



Part IITransport Channel Formats



The Transfer of Transport Blocks

MAC Layer MAC Layer

PHY LayerPHY

Layer L1

FP/AAL2

L1

FP/AAL2

TFI

TBS

TTI radio frames in use

Transport Channel

UE Node B RNC


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Transport Formats

TB Transport Block TF Transport FormatTBS Transport Block Set TFS Transport Format SetTTI Transmission TFC Transport Format Combination

Time Interval TFCS Transport Format Combination Set

DCH 2

DCH 1

TB TB TB

TBTB

TBTB

TBTBS

TF

TFSTFC

TFCS

TTI TTI

TTI

TTI

TTITI

TB

TBTB


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Transport Formats

MAC Layer

PHY Layer

RRC Layer

co

nfiguration

Semi-Static Part TTI

Channel Coding

CRC size

Rate matching

Dynamic Part Transport Block Size

Transport Block Set Size

Transport Format

Example: semi-static part dynamic part:- TTI = 10 ms- turbo coding - transport block size: 64 64 64 128- CRC size = 0 - transport block set size: 64 128 256 256- ...

TFI1 TFI2 TFI3 TFI4

TrCHs


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Transport Format Ranges

1...5000 bits

granularity: 1 bit

0...5000 bits

granularity: 1 bit

0...5000 bits

granularity: 1 bit

0...5000 bits

granularity: 1 bit

246 bits

0...5000 bits

granularity: 1 bit

0...5000 bits

granularity: 1 bit

246 bits

1...200000 bits

granularity: 1 bit

0...200000 bits

granularity: 1 bit

0...200000 bits

granularity: 1 bit

0...200000 bits

granularity: 1 bit

0...200000 bits

granularity: 1 bit

0...200000 bits

granularity: 1 bit

20 ms

10 ms

10, 20, 40

& 80 ms

10 & 20

ms

10, 20, 40

& 80 ms

10, 20, 40

& 80 ms

10, 20, 40

& 80 ms

BCH

FACH

RACH

PCH

CPCH

DCH

DSCH

convolutional 1/2

convolutional 1/2

convolutional 1/2

& 1/3; turbo

convolutional 1/2

convolutional 1/2

& 1/3; turbo

convolutional 1/2

& 1/3; turbo

convolutional 1/2

& 1/3; turbo

16

0, 8, 12,

16 & 24

0, 8, 12,

16 & 24

0, 8, 12,

16 & 24

0, 8, 12,

16 & 24

0, 8, 12,

16 & 24

0, 8, 12,

16 & 24

TransportBlock Size

TransportBlock Set Size TTI

coding typesand rates

CRCsize

Dynamic PartStatic Part

(based on TS 25.302 V3.14.0)


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Part IIICell Synchronisation


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Synchronisation Channel (SCH)

Cp = Primary Synchronisation CodeCs = Secondary Synchronisation Code

10 ms Frame

CP CP

2560 Chips 256 Chips

Cs1 Cs2 Cs15

Slot 0 Slot 1 Slot 14

CP CP CP

Cs1

Primary Synchronisation Channel (P-SCH)

Secondary Synchronisation Channel (S-SCH)

Slot 0


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15

15

SSC Allocation for S-SCHscramblingcode group

group 00group 01group 02group 03

group 05group 04

group 62group 63

1 1 2 8 9 10 15 8 10 16 2 7 15 7 161 1 5 16 7 3 14 16 3 10 5 12 14 12 101 2 1 15 5 5 12 16 6 11 2 16 11 121 2 3 1 8 6 5 2 5 8 4 4 6 3 71 2 16 6 6 11 5 12 1 15 12 16 11 21 3 4 7 4 1 5 5 3 6 2 8 7 6 8

9 11 12 15 12 9 13 13 11 14 10 16 15 14 169 12 10 15 13 14 9 14 15 11 11 13 12 16 10

slot number0 1 2 3 4 5 6 7 8 9 10 11 12 13 14

11

11 11

11 11

11 1111 11

15

15

15

15 15

15

15

15 1515 15

5

5

I monitor the S-SCH


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Primary Common Pilot Channel (P-CPICH)

CP2560 Chips 256 Chips


P-CPICH

10 ms Frame

applied speading code =

cells primary scrambling code Cch,256,0 Phase reference Measurement reference

P-CPICH

Cell scrambling code? I get itwith trial & error!


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P-CPICH as Measurement ReferenceReceived Signal Code Power (in dBm)PICH RSCPreceived energy per chip divided by the power density in the band (in dB)PICH Ec/No

received wide band power, including thermal noise and noise generated in the receiverTRA carrier RSSI

CPICH Ec/No = CPICH RSCPUTRA carrier RSSI

CPICH Ec/No

0: -241: -23.52: -233: -22.5

...47: -0.548: 0

Ec/No values in dB

CPICH RSCP

0: -1151: -1142: -113:

88: -2789: -26

RSCP values in dBm

GSM carrier RSSI

0: -1101: -1092: -108:

71: -3972: -3873: -37

RSSI values in dBm


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Primary Common Control Physical Channel (P-CCPCH)

CP2560 Chips 256 Chips


P-CPICH

10 ms Frame

P-CCPCH

Finally, I get the cellsystem information

channelisation code: Cch,256,1 no TPC, no pilot sequence 27 kbps (due to off period) organised in MIBs and SIBs


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Nokia Parameters for Cell Search WCEL: PtxPrimaryCPICH

The parameter determines the transmission power of the primary CPICH channel. It is used as a reference for all

common channels.

[-20 dBm 43 dBm], step 1 dB, default: 33dBm (WPA power = 43 dBm)

WCEL: PtxPrimarySCHTransmission power of the primary synchronization channel, the value is relative to primary CPICH transmission

power.

[-35 dB 15 dB], step size 0.1 dB, default: -3 dB

WCEL: PtxSecSCHTransmission power of the secondary synchronization channel, the value is relative to primary CPICH transmission

power.



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Nokia Parameters for Cell Search WCEL: PtxPrimaryCCPCH

This is the transmission power of the primary CCPCH channel, the value is relative to primary CPICH transmission

power.


WCEL: PriScrCodeIdentifies the downlink scrambling code of the Primary CPICH (Common Pilot Channel) of the Cell.

[0 ... 511], default: 0


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Node Synchronisation

SRNC

tme

Node B3112

3113

3114

3115

3116

31173118

RFN

tme

128

129

130

131

132

133

134

BFN

135

T1

(T4)

T2

T3

(T4 T1) (T3 T2)= Round Trip Delay(RTD) determinationfor DCH services

T1, T2, T3range: 0 .. 40959.875 ms

resolution: 0.125 ms

DL offset

UL offset

user plane defined onDCH, FACH & DSCH

BFN:Node B Frame Number

counter0..4095 frames

RFN:RNC Frame Number

counter0..4095 frames


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Cell Synchronization and Sectorised Cells

Node B with threesectorised cells

cell1

cell2

cell3

1 TS

BFN

SCH

SCH

SCH

SCH

SCH

SCH

SCH

SFN = BFN + T_cell1

SFN = BFN + T_cell2

SFN =BFN + T_cell3

T_cell3

T_cell1

T_cell2

SFN: Cell System Frame Numberrange: 0..4095 frames

T_cell: n 256 chips, n = 0..9

cell3 cell2

cell1

SCH


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Nokia Parameters for Sectorised Cells WCEL: Tcell

Timing delay is used for defining the start of SCH, P-CPICH, Primary CCPCH and DL Scrambling Code(s) in a cell

relative to BFN.

[0 ... 2304] chips, step 256 chips, no default value.


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Part IVCommon Control Physical Channels


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Secondary Common Control Physical Channel (S-CCPCH)

Slot 0 Slot 1 Slot 2 Slot 14

10 ms Frame

S-CCPCH

TFCI(optional)

Data Pilot bits

carries PCH and FACH Multiplexing of PCH and FACH on one S-CCPCH, even

one frame possible with and without TFCI (UTRAN set) SF = 4..256 (18 different slot formats no inner loop power control


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S-CCPCH and the Paging Process

Node B

UTRANBCCH (SIB 5)common

channel

definition,

including

S-CCPCH carrying one PCHS-CCPCH carrying one PCH

S-CCPCH carrying one PCHS-CCPCH without PCH

S-CCPCH without PCH

a lists of

UE

Index of S-CCPCHs

01

K-1

UEs paging channel:Index = IMSI mod K

e.g. if IMSI mod K= 1

my paging

channel

RNC


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Paging and Discontinuous Reception (FDD mode)2k framesk = 3..9

Duration:

CN domain specific

DRX cycle lengths

(option)

UE

CS Domain PS Domain

Update:a) derived by NAS

negotiationb) otherwise:

system info

Update:locally with

system info

k1 k2UTRAN

Update:a) derived by NAS

negotiationb) otherwise:

system info

k3

RRC connected

mode

stores

if RRC idle:UE DRX cycle length is

min (k1, k2)if RRC connected:

UE DRX cycle length ismin (k3, kdomain with no Iu -signalling connection)

Example withtwo CN domains


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48 NOKIA topic: The Physcial Layer / July 2003 /Markus Wimmer{b2q, b2q+1} = {1,1} {b2q, b2q+1} = {0,0}

S-CCPCH and its associated PICH

PICH frame

S-CCPCH frame,associated with PICH frame

PICH= 7680chips

b287 b288 b2992860 b1

for paging indication no transmission

# of pagingindicators per frame

(Np)Subscribers with

Pq indicatorpaged =>

183272144

Subscribers withPq indicatornot paged =>

{b4q, , b4q+3} = {1,1,,1} {b4q, , b4q+3} = {0,0,,0}

{b8q, , b8q+7} = {1,1,,1} {b8q, , b8q+7} = {0,0,,0}

{b16q, ,b16q+15} = {1,1,,1} {b16q, ,b16q+15} = {0,0,,0}

S-CCPCH


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Paging Indicator and Paging Occasion (FDD mode)

UE

my pagingindicator (PI)

PI = ( IMSI div 8192) mod Np

DRX index

number of paging indicators

18, 36, 72, 144

Paging Occasion = (IMSI div K) mod (DRX cycle length)+ n * DRX cycle length

UE

When willI get paged?

number of S-CCPCH with PCH

FDDmode


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Nokia Parameters for S-CCPCH and PagingRAN 1 & RAN1.5 support data rates of 15, 30, and 60 ksym/s for the S-CCPCH. FACH Open Loop power control can be

implemented only if the S-CCPCH is dedicated, uplink PC information through the RACH (RAN 2)

WCEL: NbrOfSCCPCHsThe parameter defines how many S-CCPCH are configured for the given cell.

Range: [1,2], step: 1; default = 1 (1 = FACH&PCH; 2 = FACH on 1 st / PCH on 2nd)

WCEL: PtxSCCPCH1 (carries FACH & PCH)This is the transmission power of the 1st S-CCPCH channel, the value is relative to primary CPICH transmission

power.

Range: [-35 dB 15 dB] , step size 0.1 dB, default: - 5dB

WCEL: PtxSCCPCH2 (carries PCH only)This is the transmission power of the 2nd S-CCPCH channel, the value is relative to primary CPICH transmission

power.

Range: [-35 dB 15 dB] , step size 0.1 dB, default: - 5dB


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Nokia Parameters for S-CCPCH and Paging WCEL: PtxPICH

This is the transmission power of the PICH channel. It carries the paging indicators

which tell the UE to read the paging message from the associated secondary CCPCH. This parameter is part of SIB

5.[-10 dB..5 dB]; step 1 dB; default: -8 dB (with Np =72)

NPRepetition of PICH bits

[18, 36, 72, 144] with relative power [-10, -10, -8, -5] dB

RNC: CNDRXLengthThe DRX cycle length used for CN domain to count paging occasions for discontinuous reception. This parameter isgiven for CS domain and PS domain separately. This parameter is part of SIB 1.

[640, 1280, 2560, 5120] ms; default = 640 ms.

WCEL: UTRAN_DRX_lengthThe DRX cycle length used by UTRAN to count paging occasions for discontinuous reception.

[80, 160, 320, 640, 1280, 2560, 5120] ms; default = 320 ms


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FACH and S-CCPCH

Node B RNC

FACH Data Frame

CFN TFI

Transmit Power Level

TB TBIub

UE

Uu

TFCI(optional) Data

Pilot bits

max. transmitpower for S-CCPCH

0..25.5 dB,step size 0.1

Transmit Power Level

PO1 PO3

Power offsets for

TFCI and TPC

defined during

channel setup


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Nokia Parameters for S-CCPCH Power SettingCurrently, either one or two S-CCPCHs are supported.

WCEL: PowerOffsetSCCPCHTFCIDefines the power offset for the TFCI symbols relative to the downlink transmission power of a Secondary CCPCH.

This parameter is part of SIB 5.

P01_15/30/6015 kbps: [0..6 dB]; step 0.25 dB; default: 2 dB

30 kbps: [0..6 dB]; step 0.25 dB; default: 3 dB


WCEL: PowerOffsetSCCPCHPilotDefines the power offset for the pilot symbols relative to the downlink transmission power of a Secondary CCPCH.

This parameter is part of SIB 5.

P03_15/30/6015 kbps: [0..6 dB]; step 0.25 dB; default: 2 dB




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Part VPhysical Random Access


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Random Access the Working Principle

Node BENo responseby the

Node B

No responseby theNode B

I just detecteda PRACH preamble

OLA!


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Random Access TimingSFN mod 2 = 0 SFN mod 2 = 0FN mod 2 = 1P-CCPCH

AICH accessslots 0 1 12119 130 14 0 1 2 76

5120chips

Preamble

5120 chips

Preamble

AS # i

4096 chips

preamble-to-preambledistance p-p

UE point of view

PRACHaccess slots

AICHaccess slots

Messagepart

preamble-to-messagedistance p-m

AcquisitionIndication

preamble-to-AIdistance p-a

(distances depend on AICH_Transmission_Timing )

AS # i


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PRACH Sub-channels and Access Service Classes (ASC)SFN mod 8 of the

corresponding

P-CCPCH frame

0

1

2

3

4

5

6

7

0

12

9

6

3

1

13

10

7

4

2

14

11

8

5

3

0

12

9

6

4

1

13

10

7

5

2

14

11

8

6

3

0

12

9

7

4

1

13

10

8

5

2

14

11

9

6

3

0

12

10

7

4

1

13

Sub-channel number

1 2 3 4 5 6 7 8 9 10 11

11

8

5

2

14

0

(cited from TS 25.214 V3.11.0, chap. 6.1.1)

Node B

BCCH (SIB 5, SIB 7)

UE ASCs and their PRACH access resources + signatures, AC mapping into ASCs


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PRACH Preamble

Node B

UTRANBCCH

UE RNC

Pi Pi Pi Pi

Preamble Signature

(16 different versions)

16 bits256 repetitions

PRACH Preamble Scrambling Code

512 groups 16 preamble scrambling codes Cells primary scrambling codes associated

with preamble scrambling code group

available signatures for randomaccess

available preamble scramblingcodes

available spreading factor available sub-channels etc.

PRACH Message Part


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10 ms Frame

RACH data

L1 control data 8 Pilot bits (sequence depends on slot number) 2 TFCI bits

data

SF = 256

channelisation code:

CCH,256,16*k+15, withk = signature number

SF = 256, 128, 64, or 32

channelisation code:

CCH,SF,SF*k/16, withk = signature number

Scrambling code =

PRACH preamble scrambling code

PRACH Power Setting Preamble_Initial_Power =


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UL interference+ Primary CPICH TX power CPICH_RSCP+ Constant Value

UL interferenceat Node B

1st preamble:power setting

attenuationin the DL

estimated receive levelConstant Value

Pre-amble

Controlpart

Pre-amble

Pre-amble

Pp-pPp-p

Pp-m1..8 dB

-5..10 dB

# of preambles: 1..64 # of preamble cycles: 1..32

Acquisition Indication Channel (AICH)


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Access Slot 0 Access Slot 1 Access Slot 2 Access Slot 14

20 ms Frame

a0 a1 a2 a29 a30 a31

15

0

js,sj bAIas

AICH signature pattern (fixed)

Acquisition Indicator

+1 if signature s is positively confirmed

-1 if signature s is negatively confirmed

0 if signature s is not included in the

set of available signatures

Nokia Parameters Related to the PRACH and AICH


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In RAN1, Node B L1 shall be able to simultaneously scan 12 RACH sub-channels with 4 signatures per sub-channel from UEs situating up

to 'Cell radius' distance from the Node B site. 'Cell radius' is the maximum radius of the cell and it is given from the RNC to the Node

B. In RAN1, the maximum value for the 'Cell radius' is 20 km.

WCEL:PRACHRequiredReceivedCIThis UL required received C/I value is used by the UE to calculate the initial output power on PRACH according to the

Open loop power control procedure. This parameter is part of SIB 5.

[-35 dB..-10 dB]; step 1 dB; default -25 dB

WCEL: PowerRampSteponPRACHPreambleUE increases the preamble transmission power when no acquisition indicator is received by UE in AICH channel. This

parameter is part of SIB 5.[1dB..8dB]; step 1 dB; default: 2 dB

WCEL: PowerOffsetLastPreamblePrachMessageThe power offset between the last transmitted preamble and the control part of the PRACH message.

[-5 dB..10 dB]; step 1 dB; default 2dB

WCEL: PRACH_preamble_retransThe maximum number of preambles allowed in one preamble ramping cycle, which is part of SIB5/6.[1 ... 64]; step 1; default 8.



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WCEL: RACH_tx_MaxMaximum number of RACH preamble cycles defines how many times the PRACH pre-amble ramping procedure can be

repeated before UE MAC reports a failure on RACH transmission to higher layers. This message is part of SIB5/6.

[1 ... 32]; default 8.

WCEL: PRACHScramblingCodeThe scrambling code for the preamble part and the message part of a PRACH Channel, which is part of SIB5/6.

[0 ... 15]; default 0.

WCEL: AllowedPreambleSignaturesThe preamble part in a PRACH channel carries one of 16 different orthogonal complex signatures. Nokia Node B

restrictions: A maximum of four signatures can be allowed (16 bit field).

[0 ... 61440]; default 15.

WCEL: AllowedRACHSubChannelsA RACH sub-channel defines a sub-set of the total set of access slots (12 bit field).

[0 ... 4095]; default 4095.



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WCEL: PtxAICHThis is the transmission power of one Acquisition Indicator (AI) compared to CPICH power. This parameter is part of SIB

5.

[-22 ... 5] dB, step 1 dB; default: -8 dB.

WCEL: AICHTraTimeAICH transmission timing defines the delay between the reception of a PRACH access slot including a correctly detected

preamble and the transmission of the Acquisition Indicator in the AICH.

0 ( Delay is 0 AS), 1 ( Delay is 1 AS) ;default 0.

WCEL: RACH_Tx_NB01minIn case that a negative acknowledgement has been received by UE on AICH a backoff timer TBO1 is started to determine

when the next RACH transmission attempt will be started. The backoff timer TBO1 is set to an integer number NBO1 of 10

ms time intervals, randomly drawn within an Interval 0 NB01min NBO1 NB01max (with uniform distribution).[0 ... 50]; default: 0.

WCEL: RACH_Tx_NB01max[0 ... 50]; default: 50.

Overload Detection in the Random Access


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eambleMax

eamble

N

N

Pr,

Pr

SignatureSubRacheambleMax NNN 8

5Pr,

time

RachOverLoadBS

RachNormalLoadBS

RACH for NRT RABnot allowed

RACH for NRT RABallowed

RNC

WinRACHnormalLoadBS

(time measured in RACH

indication periods)

WinRACHoverLoadBS

(time measured in RACH

indication periods)



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WCEL:RACHCapacityRACH Capacity defines the HW capacity reserved for a RACH transport channel in the Node B. RACH Capacity is given

as a number of decoded RACH messages in a 10 ms radio frame.

2, 4, 8; default: 2

WCEL:RRIndPeriodThe parameter defines the reporting period of the Radio Resource Indication messages, which are used for cell based load

measurements. The Node B informs the RNC about the current load at the radio interface from the radio resource point of

view and the load of every RACH in each cell.

[100 ... 2000] ms, step 100 ms; default: 200 ms

WCEL:RACHloadIndicationPeriodThe parameter defines the reporting period of the PRACHs in a Node B. The Node B may report load figures to the RNC

in every Nth (N=1-20) NBAP Radio Resource Indication message. Value 0 of the parameter means that the BTS does not

report the load information for RACH.

[0 ... 20], step 1; default 1



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WCEL:RachOverLoadBSThis parameter defines the threshold when RACH is considered to be in overload.

[0 ... 100] %, step 1 %; default 100%

WCEL:WCEL:WinRACHoverLoadBSParameter defines the comparison window size for RACH overload detection in RACH load indication periods.

[0 ... 100], step 1; default 1

WCEL: RachNormalLoadBSThis parameter defines the threshold when RACH is considered to be in normal load.

0 ... 100] %, step 1 %; default 100%

WCEL: WinRACHnormalLoadBSParameter defines the comparison window size for RACH normal load detection in RACH load indication periods.

[0 ... 100], step 1; default: 5


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Part VICommon Packet Channel

Downlink Dedicated Physical Channel (DPCH)


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Node BENo responseby theNode B PCPCH (access preamble)

PCPCH (access preamble)

PCPCH (access preamble)

No responseby theNode B

AP-AICH (possitive indication)PCPCH (collision detection preamble)

CD/CA-ICH (possitive acknowledgement)PCPCH (power preamble & data)

CPCH Timing


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AP

AP

p-p p-p p-cdp

CD/CA

AP-AICH CD/CA-ICH

p-a1

cdp-pcp

a1-cdpcdp-a2

Power ControlPreamble

(0 or 8 timeslots)

data

DPCCH for CPCHExample with Tcpch=0adopted from TS 25.211 V3.12.0

PCPCH Timing


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10 ms Frame

TPCbits Pilot bits

TFCIbits

CPCH Control Command(CCC) bits

SP = 512DPCCH for CPCH.


10 ms Frame

TPCbitsPilot bits TFCI bits

Data 1 bitsDPDCH with CCH,SF,SF/4,with SF = 4..256

DPCCH with CCH,256,0 FBI bits

PCPCH message part

PCPCH Access & Collision Detection Preamble


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Node B

UTRANBCCH

UE RNC

Pi Pi Pi Pi

Preamble Signature

(16 different versions)

16 bits256 repetitions

PCPCH Preamble Scrambling Code

512 groups 80 (64) preamble scramblingcodes

available signatures for randomaccess

available preamble scramblingcodes

available spreading factor available sub-channels etc.

Nokia and the CPCH


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CPCH will be supported with RAN 2.

Following Layer 1 parameters are required

Access preamble (AP) scrambling code

Access preamble signature set. The maximum number of these is 16. These can be shared with RACH or separate.

AP slot sub-channels group.

Collision detection (CD) preamble scrambling code.

CD preamble signature set. The number of these is 16 and can be shared or separate with RACH.

CD preamble slot sub-channels group

CD-AICH preamble channelisation code

CPCH scrambling code

CPCH channelisation code (variable, depends on bitrate)

DPCCH DL channelisation code


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Part VIDedicated Physical ChannelDownlink



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10 ms Frame

TPCbits Pilot bits

TFCIbits

(optional)Data 2 bitsata 1 bits

DPDCHDPDCH DPCCH DPCCH

Radio Frame0

Radio Frame1

Radio Frame2

Radio Frame71

Superframe = 720 ms

17 different slot formats

Compressed mode slot format for

changed SF & changed puncturing



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TS TS

maximum bit rate

TS TS TS

discontinuous transmission with lower bit rate

Multicode usage:

TS TS TS

TS TS TS

DPCH 1

DPCH 2

DPCH 3

Power Offsets for the DPCH Power offsets TFCS

l f


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Node B RNC

DCH Data Frame

Iub

UE

Uu

PO1

NBAP: RADIO LINK SETUP REQUEST

TPCbits Pilot bits

TFCIbits

(optional) Data 2 bitsata 1 bitsPO3O2

DL DPCH slot format

FDD DL TPC step size

...

P0x: 0..6 dB

step size: 0.25 dB

Nokia Parameters Related to DPCHsRNC


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RNC:PowerOffsetDLdpcchPilotThe parameter defines the power offset for the pilot symbols in relative to the data symbols in dedicated downlink physical

channel

[0 6 dB]; step size 0.25 dB; default: 3 dB for 12.2 kbps

RNC: PowerOffsetDLdpcchTpc,The parameter defines the power offset for the TPC symbols relative to the data symbols in dedicated downlink physical

channel

[0 6 dB]; step size 0.25 dB; default: 3 dB for 12.2 kbps

RNC: PowerOffsetDLdpcchTfci,The parameter defines the power offset for the TFCI symbols relative to the data symbols in dedicated downlink physical

channel.

[0 6 dB], step size 0.25 dB; default: 3 dB for 12.2 kbps

More details about the load management can be found in the course 3G RPLS 3.

Downlink Inner Loop Power Control


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DPC_MODE = 0

unique TPC commandper TS

DPC_MODE = 1

same TPC over 3 TS,then new command

two modescell

TPC

TPCest per1 TS / 3 TS



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UTRAN behaviour

P(k) = P(k- 1) + PTPC(k) + Pbal(k),

currentDL power

poweradjustment

newDL power

Correction termfor RL balancing

toward CPICH

P

time

PTPC Pbal

IFLimited Power Increase Used= 'Not used'

PTPC(k) =+ TPC, if TPCest (k) = 1- TPC, if TPCest (k) = 0

TPC step size: 0.5, 1, 1.5 or 2 dB

mandatory



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UTRAN behaviour

P(k) = P(k- 1) + PTPC(k) + Pbal(k),current

DL powerpower

adjustment

newDL power

Correction termfor RL balancing

toward CPICH

P

time

PTPCPbal

IF

Limited Power Increase Used= 'used'

DL_Power_Averaging_Window_Size

PTPCPower_

Raise_

Limit

K-1

TPCest (k) = 1 => PTPC(k) = 0

otherwise assee preceding

slide

K time

Timing Relationship between Physical Channels


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SFN mod 2 = 0 SFN mod 2 = 1P-CCPCH

AICH accessslots 0 1 12119 130 14 0

SCH

nth S-CCPCH S-CCPCH,n

kth S-CCPCH DPCH,k0..38144

(step size 256)

0..38144

(step size 256)

Radio Interface SynchronisationTm =

R l ti ti i


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UEcell1

T0 =1024chips

cell2= target

cell for HO

timing differencerange: 0..38399Res.: 1 chip

SRNC

(Frame Offset, Chip Offset)

Relative timing

between DL DPCH

and P-CCPCH

range: 0..38144

res.: 256 chips

Offset

between DL DPCH

and P-CCPCH

range: 0..38399

res.: 1 chip

(Frame Offset) (TM)


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Part VIDedicated Physical ChannelUplink

Uplink Dedicated Physical ChannelsSuperframe = 720 ms


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10 ms Frame

TPCbitsPilot bits

TFCI bits(optional)

Data 1 bits

Radio Frame0

Radio Frame1

Radio Frame2

Radio Frame71

DPDCH

DPCCH FBI bits

7 different

slot formats

6 different slot formats

Compressed mode slot format forchanged SF & changed puncturing

Feedback Indicator for

Closed loop mode transmit diversity, &

Site selection diversity transmission (SSDT)

Discontinuous Transmission and Power Offsets


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DPCCH

DPDCH

DPCCH

DPDCH

DPCCH

DPDCH

TTL TTL TTL

UL DPDCH/DPCH Power Difference:

DPCCH

DPDCH

=dc=Nominal Power Relation Aj

two methods to determine the gain factors:

signalled for each TFCs

calculation based on reference TFCs

UL Inner Loop Power Control


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time

SIRest

SIRtarget

TPC TPC_cmd

in FDD mode:1500 times per second

UL Inner Loop Power Controlalgorithms for processing power control commands


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PCA2 PCA1 PCA2

TPC_cmd

PCA1TPC_cmd for each TSTPC_cmd values: +1, -1step size TPC: 1dB or 2dB

PCA2TPC_cmd for 5th TSTPC_cmd values: +1, 0, -1step size TPC: 1dB

UL DPCCH power adjustment: DPCCH = TPC TPC_cmd

km/h0 3 80Rayleigh fading can be compensated

Power Control Algorithm 1


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Example: reliable transmission

Cell 1 Cell 2

Cell 3

TPC1 = 1 TPC3 = 0

TPC3 = 1

TPC_cmd = -1

Power Control Algorithm 2 (part 1)


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TPC_temp00001000000000-1

if all TPC-values = 1

TPC_temp = +1

if all TPC-values = 0

TPC_temp = -1

otherwise

TPC_temp = 0

Power Control Algorithm 2 (part 2)


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TPC_temp1 TPC_temp2 TPC_temp3

Example:

N

i

iN 1

TPC_temp1

N = 3

-1 -0.5 0 0.5 1

TPC_cmd = -1 1

Initial Uplink DCH TransmissionDPCCH only DPCCH & DPDCH


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receptionat UE

trans-mission

at UE T0

DPCCH only,always based on PCA1

DPCCH & DPDCHPCA based on RRC

0 to 7 frames forpower control preamble

DPCCH_Initial_power = CPICH_RSCP + DPCCH_Power_offset


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Part VIIDownlink Shared Channel

Physical Downlink Shared Channel (PDSCH)


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Slot 0 Slot i Slot 14

10 ms Frame

DataDPDCH

TFCI with PDSCH

association

DPCH

PDSCH

10 ms DPCH Frame 3 TS 15 TS DSCH arrival window

SF = 256..4

Physical Downlink Shared Channel (PDSCH)PDSCH Root Channelisation Tree


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e.g.

SF=128 SF=256SF=64SF=32

PDSCH root

channelisation code

PDSCH 1

PDSCH 2

UE 1SF = 32 UE 2

SF = 64UE 1

SF = 64

UE 3SF = 64

UE 1SF = 64

UE 3SF = 64

UE 2SF = 128

UE 2SF = 128

UE 3SF = 128

Physical Downlink Shared Channel (PDSCH)MS4Challenges:


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BS MS2

MS3

MS1

MS4

DSCH

AssociatedDCH's

Bit rate

Power

DSCH

AssociatedDCH's

DSCH bit ratedepends on location

DCH bit rateis constant

DSCH power isabout constant

No SHO => effect to coverage and capacity?

Fast allocation => bursty interference and resource reservation.

Power control from DCH. DSCH is major change for BS and RNC.

Iub resource usage => need for statistical multiplexing.

Possibilities: Fast allocation => more efficient code and other resource usage.

User prioritization easy.

Shorter end-user delay. (Set-up delay is the same than in

DCH!)

Better controllable in overload situations.

Higher peak bitrates can be used.

02 3g rpls2_v2-0 the physical layer

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