Upload
aondortoglu
View
220
Download
23
Tags:
Embed Size (px)
Citation preview
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
Test case PtxPrimaryCPICH PtxDPCHmax Ptx_AMR
limit1CPICHtoRefRAB
offsetPtx AMR
limit2Ptx AMR
limit
=PA-PtxDPCHmax
dBm dB dBm dB dBm dBm
Test 2 35 0 46 2 33 33
Test 4 35 0 46 -10 45 45
11/08/06 6
Effect of CPICHtoRefRABoffset on coverage and BLER
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
Effect of CPICHtoRefRABoffset on
coverage and BLERg
• When more power is available, more power will be consumed
Test 4Test 4
11/08/06 9
Effect of CPICHtoRefRABoffset on coverage and BLER
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
11/08/06 10
Effect of CPICHtoRefRABoffset on coverage and BLER
11/08/06 11
Reference
Effect of CPICHtoRefRABoffset on
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
Test case PtxPrimaryCPICH PtxDPCHmax Ptx_AMR
limit1CPICHtoRefRAB
offsetPtx AMR
limit2Ptx AMR
limitCPICH limit1 offset limit2 limit
=PA-PtxDPCHmax
dBm dB dBm dB dBm dBmdBm dB dBm dB dBm dBm
Reference Drive 35 -3 43 2 33 33
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
Impact of decreasing the CPICH
The cell coverage breaks at similar range regardless the difference of CPICH power
11/08/06 15
Impact of decreasing the CPICH
DCH power limit plays significant role in defining cell coverage
11/08/06 16
Impact of increasing CPICH on coverage and BLERp g g
Test case PtxPrimaryCPICH PtxDPCHmax Ptx_AMR
limit1CPICHtoRefRAB
offsetPtx AMR
limit2Ptx AMR
limit
=PA-PtxDPCHmax
dBm dB dBm dB dBm dBm
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