Training Network Tests - UMTS

DPCH V CPICHDPCH Vs CPICH Nokia

T Mobile FSCT-Mobile FSC UMTS Performance Team

Power Control Related Parameter Setting-Nokia

Test case PtxPrimaryCPICH PtxDPCHmax Ptx_AMR

limit1CPICHtoRefRAB

offsetPtx AMR

limit2Ptx AMR

limit

=PA-PtxDPCHmax

dBm dB dBm dB dBm dBm

Reference Drive 35 -3 43 2 33 33

Test 1 35 -3 43 10 25 25

Test 2 35 0 46 2 33 33

T t 3 35 3 43 10 45 45Test 3 35 -3 43 -10 45 45

Test 4 35 0 46 -10 45 45

Test 5 39 1 47 -6 45 45

Test6 32 3 43 1 31 31Test6 32 -3 43 1 31 31

Parameters Setting-NokiaDL power setting:

Total PA power – 40W (No related Nokia Parameter)CPICH power (PtxPrimaryCPICH)=35dBmDL Maximum Tx power per traffic channel (PtxDPCHmax) = -3dB DL Mi i T t ffi h l (Pt DPCH i ) 28dBDL Minimum Tx power per traffic channel (PtxDPCHmin) = -28dB DL maximum Tx power per radio link (PtxDLabsMax) =37dBm

BLER target (DLreferenceTargetBLER) =-2.2

=10^(-2.2)=0.63% (defined in WCEL parameter)=10^(-2)=1% (viewed from field measurement)

Downlink bit rate of the reference service (DLreferenceBitRate)=12.2 (kbps, AMR voice)DL maximum power of reference service (CPICHtoRefRABoffset)

=2dB (= PtxPrimaryCPICH-2=33dBm)(The parameter( p

CPICHToRefRABOffset defines the maximum link transmission power for a selected reference radio access bearer, for example, 12.2-kbps speech service, The maximum link powers of other services are obtained by scaling the reference maximum power with the ratio of bit rates, R/Rref, and the ratio of DL Eb/N0 requirements, /ref, between the reference and a particular service:

CPICH RSCP vs. CPICH Ec/No

RSCP Ec/No Below -15.0

>= -15.0 to < -12.0

Above -12.0

Below -110.00

>= -110.00 to < -90.00

Above -90.00

11/08/06 4Serving cell

BLER and UE Transmit Power

BLER UE Transmit Power

Below 10.0

>= 10.0 to < 15.0

Above 15.0

>= 0.00 to < 1.00

>= 1.00 to < 2.00

>= 2.00 to < 5.00

>= 5.00 to < 101.00

11/08/06 5

Effect of CPICHtoRefRABoffset on coverage and BLER


limit1CPICHtoRefRAB

offsetPtx AMR

limit2Ptx AMR

limit

=PA-PtxDPCHmax


Test 2 35 0 46 2 33 33

Test 4 35 0 46 -10 45 45

11/08/06 6


Test-Case-2 vs. Test Case-4

• As can be seen increasing the• As can be seen, increasing the max DL transmission power of reference service (AMR Speech) increases the coverage along with a reduction in the BLER even with the same CPICH value.

11/08/06 7

Test 2

Effect of CPICHtoRefRABoffset on

coverage and BLERg

• When the max DL transmission power of reference service (AMR speech) increases, the cell coverage extended even

Test 4g

though the CPICH is the same

11/08/06 8

Test 2


coverage and BLERg

• When more power is available, more power will be consumed

Test 4Test 4

11/08/06 9



limit1CPICHtoRefRAB

offsetPtx AMR

limit2Ptx AMR

limit

=PA-PtxDPCHmax



Test 1 35 -3 43 10 25 25

11/08/06 10


11/08/06 11

Reference


coverage and BLERcoverage and BLER

• In line with our previous slide the coverage decreases with a Test 1co e age dec eases t adecrease in the max DL Tx power (AMR Speech) for the same value of CPICH.

Test 1

11/08/06 12

Impact of decreasing the CPICHp g


limit1CPICHtoRefRAB

offsetPtx AMR

limit2Ptx AMR

limitCPICH limit1 offset limit2 limit

=PA-PtxDPCHmax

dBm dB dBm dB dBm dBmdBm dB dBm dB dBm dBm


Test6 32 -3 43 1 31 31

11/08/06 13

Impact of decreasing the CPICH

Reference

Test6 shows lower measured Ec/Io with 3dB lower on CPICH power.

Test6

11/08/06 14


The cell coverage breaks at similar range regardless the difference of CPICH power

11/08/06 15


DCH power limit plays significant role in defining cell coverage

11/08/06 16

Impact of increasing CPICH on coverage and BLERp g g


limit1CPICHtoRefRAB

offsetPtx AMR

limit2Ptx AMR

limit

=PA-PtxDPCHmax


Test 4 35 0 46 -10 45 45

Test 5 39 1 47 -6 45 45

11/08/06 17

Impact of increasing CPICH on coverage and BLER

11/08/06 18

Impact of increasing CPICH on coverage and

BLERBLER

• 3-4dB improvements are measured at cell edge for test5

11/08/06 19

Impact of increasing CPICH on coverage and

BLERBLER

• With 4dB higher CPICH power of test5, no significant improvement on cell coverage is measured

11/08/06 20

Observation from the DT data

• Increasing the DL DCH value keeping the CPICH power constant will improve cell coverage

• Decreasing in CPICH with lowered DL DCH power, cell coverage change is minim mminimum.

• DCH power plays more important role in defining cell coverage than CPICH powerpower

11/08/06 21

Training Network Tests - UMTS

Documents

Transcript of Training Network Tests - UMTS