antenna hopping presentation

18
1 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential Antenna Hopping for UltraSite BTS New Solution in BSS11 Application Software Benefits: Improved spectral efficiency in UltraSite environment – Less BTS sites needed Quality and capacity improvements in purely interference limited networks Application Software

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guide for antenna hpping

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1 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Antenna Hopping for UltraSite BTS

New Solution in BSS11 Application Software

Benefits:Improved spectral efficiency in UltraSiteenvironment – Less BTS sites needed

Quality and capacity improvements in purely interference limited networks

ApplicationSoftware

2 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

• Antenna Hopping improves the QoS both in downlink and uplink (reduces number of transmission errors)

• Transmission and reception of frames alternates between physically separated antennas according to predefined rules

• 2dB DL/UL gain in very narrow band without any additional TRX

Antenna Hopping for UltraSite BTS

TX 1

TX 2

BB

F-Bus

BB

[BCCH TRX1FN

n ], [TRX2FN

n+1

], [BCCH TRX1FN

n+2

]...

[TRX2 FNn], [BCCH TRX1FN

n+1 ], [TRX2FN

n+2

] ...

3 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

BCCH vs Hopping TCH Coverage

BCCH TRX Coverage

Hopping TRX Coverage

4 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Antenna Hopping for UltraSite BTS

• Antenna hopping is an enhancement to RF hopping so that also BB-hopping is used internally by the BTS to transmit via different antenna

• Antenna hopping provides extra gain via improved spectral efficiency on BCCH layer in very narrow band environment (e.g. 3.6 MHz)

• Additional TRX is not required like in IDD

• Minimum configuration is 2 TRX/cell

Data route to downlink in AH configuration (FN = N)

EFBIA CHDSP

EQDSP

EDIBA

UC

DTRU

D-bus

AH master TRX

RFM asics

EFBIA CHDSP

EQDSP

EDIBA

UC

AH slave TRX

RFM asics

Fbus

signaling from the Abis I/f downlink bursts from AH master downlink bursts from AH slave

TX

TX

traffic TSs from Abis

Data route to downlink in AH configuration (FN =N+1)

EFBIA CHDSP

EQDSP

EDIBA

UC

DTRU

D-bus

AH master TRX

RFM asics

EFBIA CHDSP

EQDSP

EDIBA

UC

AH slave TRX

RFM asics

Fbus

signaling from the Abis I/f downlink bursts from AH master downlink bursts from AH slave

TX

TX

traffic TSs from Abis

Frame number FN=N Frame Number FN=N+1

5 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Requirements

• BSS S11 & UltraSite CX4.04

• ULTRASITE EDGE HW

• EDGE TRX (non-EDGE TRX can be used in the same cabinet if it is in a non-hopping or RF Hopping mode)

• Minimum of 2 TRXs per BTS (or cell) where both are used for antenna hopping

• Antenna Hopping Groups can include the BCCH

6 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Restrictions

• The following features cannot be used together with Antenna Hopping:

• Cannot be used with Remote Tune Combiner (RTC)• Cannot be used with Baseband Hopping (BB) in the same BTS• Cannot be used with IDD in the same BTS (IDD uses the same BB hopping

module for AH)

• The feature is OFF in the BTS if:• TRX(s) are down • The number of working TRXs fall below 2 TRXs/BTS

• The following tests are not possible when Antenna Hopping is in use

• TRX test for Nokia UltraSite• TRX loop test

7 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Implementation

• Set parameter “antenna hopping (AHOP)” to Y

• AHOP is BTS level

• If HW configuration supports AH (i.e., two transmitting antennae), site visit is not needed

8 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Antenna hopping without frequency hopping

• With uncorrelated TX antennas, 1.5-4.5 dB gain depending on MS speed

• With 0.5 correlation between TX antennas, 1.0-3.0 dB gain

1.0%

10.0%

100.0%

0 5 10 15 20

C/I [dB]

TC

H F

ER

TU3 nFHTU3 nFH AHTU3 nFH AH corrTU50 nFHTU50 nFH AHTU50 nFH AH corr

9 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Antenna hopping with frequency hopping

• With uncorrelated TX antennas, 2 dB gain in the example FH case (random hopping over 5 adjacent frequencies)

• With 0.5 correlation between TX antennas, the gain is less than 1 dB

1.0%

10.0%

100.0%

0 5 10 15 20

C/I [dB]

TC

H F

ER

TU3 RH5

TU3 RH5 AH

TU3 RH5 AH corr

RH5 = random hopping over 5 frequencies, RF-hopping with 5 adjacent frequencies

simulated

10 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

BCCH Re-use in Narrowband Network

• BCCH can not use frequency hopping.

• Non-hopping traffic channels limit the performance in interference limited.

• AH improves BCCH performance => allows to tighten frequency reuse: from 5/15 to 4/12from 4/12 down to 3/9(target quality)

BCCH TCH

3.6 MHz ~ 18 carriers

BCCH TCH

5/15

4/12

Re-use

0

5

10

15

7 9 11 13 15 17

BCCH reuse factor

Bad

qua

lity

conn

ectio

ns [%

] (co

nnec

tion

FE

R >

1%

) GSM EFR, reference

GSM EFR, IDD

3/9

4/125/15

EFR IDD

EFR

11 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

0

0.2

0.4

0.6

0.8

1

1.2

Rel

ativ

e sp

ectr

al e

ffici

ency

3.6 MHz 4.8 MHz 7.2 MHz

AH on allfrequencies

AH on BCCH

reference

From the point of view of spectral efficiency, the

benefits of AH are higher in narrowband

Total network level capacity (BCCH + EFR TCH)

• Reference case: Lower spectral efficiency with small bandwidth since BCCH layer reserves most of the band

• AH on BCCH: Improves spectral efficiency significantly due to decreased BCCH reuse (more hopping EFR TCH frequencies)

• AH on all TRXs: Some additional capacity in EFR case

12 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Antenna Configuration 1/2

TRX

TRX

TRX

TRX

TRX

TRX

TRX

TRX

COMB2way

COMB2way

COMB2way

COMB2way

COMB2way

COMB2way

DDU(Filter)

Port 1

Port 2

Antenna

Antenna

Dual Stage 2 Way Combining

13 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Antenna Coniguration 2/2

TRXCOMB2way

TRX

TRX

TRX

COMB2way

DDU(Filter)

Port 1

Port 2 Antenna

Antenna

Single Stage 2 Way Combining

14

©NOKIA V

ersio

n 0.1 / 7

-7-2004 / S

amur W

orasilp

chai

Company Confid

entia

l

1700H Performance Trends (Live

Trial)

DC

R_8C

1700H

0

0.5 1

1.5 2

2.5 3

09-01-2004:17

09-04-2004:17

09-07-2004:17

09-10-2004:17

09-13-2004:17

09-16-2004:17

09-19-2004:17

09-22-2004:17

09-25-2004:17

09-28-2004:17

10-01-2004:17

10-04-2004:17

10-07-2004:17

10-10-2004:17

10-13-2004:17

10-16-2004:17

10-19-2004:17

10-22-2004:17

10-25-2004:17

10-28-2004:17

10-31-2004:17

%

DC

R_8c

thre

shold

1th

reshold

2

DC

R C

auses 1700H

0

0.5 1

1.5 2

2.5 3

3.5 4

09-01-2004:17

09-04-2004:17

09-07-2004:17

09-10-2004:17

09-13-2004:17

09-16-2004:17

09-19-2004:17

09-22-2004:17

09-25-2004:17

09-28-2004:17

10-01-2004:17

10-04-2004:17

10-07-2004:17

10-10-2004:17

10-13-2004:17

10-16-2004:17

10-19-2004:17

10-22-2004:17

10-25-2004:17

10-28-2004:17

10-31-2004:17

tch

_a

ct_

fail_

call

tch

_la

pd

_fa

il

tch

_n

etw

_ac

t

tch

_u

ser_

ac

t

tch

_b

ts_

fail

tch

_b

csu

_re

set

tch

_a

_if_

fail_

old

tch

_a

_if_

fail_

ca

ll

tch

_tr_

fail_

old

tch

_tr_

fail

tch

_a

bis

_fa

il_old

tch

_a

bis

_fa

il

tch

_rf_

old

_h

o

tch

_ra

dio

_fa

il

HO

Fa

ilure

Ra

te 1

70

0H

0 5 10 15 20 25 30 35 40 45

09-01-2004:17

09-04-2004:17

09-07-2004:17

09-10-2004:17

09-13-2004:17

09-16-2004:17

09-19-2004:17

09-22-2004:17

09-25-2004:17

09-28-2004:17

10-01-2004:17

10-04-2004:17

10-07-2004:17

10-10-2004:17

10-13-2004:17

10-16-2004:17

10-19-2004:17

10-22-2004:17

10-25-2004:17

10-28-2004:17

10-31-2004:17

%

ho_

fail_

inte

rho_fa

il_in

traho_fa

ilth

reshold

1th

res

hold

2

EF

L 1700H

0 2 4 6 8 10 12 14

09-01-2004:17

09-04-2004:17

09-07-2004:17

09-10-2004:17

09-13-2004:17

09-16-2004:17

09-19-2004:17

09-22-2004:17

09-25-2004:17

09-28-2004:17

10-01-2004:17

10-04-2004:17

10-07-2004:17

10-10-2004:17

10-13-2004:17

10-16-2004:17

10-19-2004:17

10-22-2004:17

10-25-2004:17

10-28-2004:17

10-31-2004:17

%

Ho

pp

ing

EF

L/C

ell

15

©NOKIA V

ersio

n 0.1 / 7

-7-2004 / S

amur W

orasilp

chai

Company Confid

entia

l

2100H Performance Trends (Live

Trial)

DC

R_8C

2100H

0

0.5 1

1.5 2

2.5 3

3.5

09-01-2004:21

09-04-2004:21

09-07-2004:21

09-10-2004:21

09-13-2004:21

09-16-2004:21

09-19-2004:21

09-22-2004:21

09-25-2004:21

09-28-2004:21

10-01-2004:21

10-04-2004:21

10-07-2004:21

10-10-2004:21

10-13-2004:21

10-16-2004:21

10-19-2004:21

10-22-2004:21

10-25-2004:21

10-28-2004:21

10-31-2004:21

%

DC

R_

8c

thre

sh

old

1th

res

ho

ld2

DC

R C

au

se

s 2

10

0H

0

0.5 1

1.5 2

2.5 3

3.5 4

4.5

09-01-2004:21

09-04-2004:21

09-07-2004:21

09-10-2004:21

09-13-2004:21

09-16-2004:21

09-19-2004:21

09-22-2004:21

09-25-2004:21

09-28-2004:21

10-01-2004:21

10-04-2004:21

10-07-2004:21

10-10-2004:21

10-13-2004:21

10-16-2004:21

10-19-2004:21

10-22-2004:21

10-25-2004:21

10-28-2004:21

10-31-2004:21

tch_

ac

t_fa

il_call

tch_

lap

d_fa

il

tch_

ne

tw_

ac

t

tch_

us

er_

ac

t

tch_

bts

_fa

il

tch_

bc

su_

reset

tch_

a_

if_fa

il_old

tch_

a_

if_fa

il_call

tch_

tr_fa

il_o

ld

tch_

tr_fa

il

tch_

ab

is_fa

il_old

tch_

ab

is_fa

il

tch_

rf_old

_ho

tch_

radio

_fa

il

HO

Failu

re R

ate 2100H

0 5

10

15

20

25

30

35

40

09-01-2004:21

09-04-2004:21

09-07-2004:21

09-10-2004:21

09-13-2004:21

09-16-2004:21

09-19-2004:21

09-22-2004:21

09-25-2004:21

09-28-2004:21

10-01-2004:21

10-04-2004:21

10-07-2004:21

10-10-2004:21

10-13-2004:21

10-16-2004:21

10-19-2004:21

10-22-2004:21

10-25-2004:21

10-28-2004:21

10-31-2004:21

%

ho_

fail_

inte

rh

o_

fail_

intra

ho

_fa

ilth

res

ho

ld1

thre

sh

old

2

EF

L 2100H

0 2 4 6 8

10

12

14

16

09-01-2004:21

09-04-2004:21

09-07-2004:21

09-10-2004:21

09-13-2004:21

09-16-2004:21

09-19-2004:21

09-22-2004:21

09-25-2004:21

09-28-2004:21

10-01-2004:21

10-04-2004:21

10-07-2004:21

10-10-2004:21

10-13-2004:21

10-16-2004:21

10-19-2004:21

10-22-2004:21

10-25-2004:21

10-28-2004:21

10-31-2004:21

%

Hoppin

gEFL/C

ell

16 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

DCR Performance Gains

0.00

0.50

1.00

1.50

2.00

2.50

0 2 4 6 8 10 12 14 16

EFL

DC

R 8

c

Baseline (before)

AH

Baseline (after)

15 BCCH

20% gain

17 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Preliminary SDCCH Success Rate

98.00

98.20

98.40

98.60

98.80

99.00

99.20

99.40

99.60

99.80

100.00

0 2 4 6 8 10 12 14

EFL

%

Baseline (before)

AH

Baseline (after)

15 BCCH

18 © NOKIA Version 0.1 / 7-7-2004 / Samur Worasilpchai Company Confidential

Conclusions

• Quality and capacity improvements in interference limited networks

• 1-3 dB gain without FH (TU3, 0.5 correlation between TX antennas)

• 0.5 dB gain with RH5 (TU3, 0.5 correlation between TX antennas)

• Actual field trials show a 20% gain in the Drop Call Rate

• Mobile and Static traffic benefit from the processing gain

• Improved KPIs (DCR and HOSR)

• Possible benefits on hopping layer with high frequency correlation