Transcript
RTWP Optimization RoadmapRTWP OptimizationOptimization
SolutionSupported VersionImpact RangeSolutions Available in
Different VersionsImplementationRemarksR10R11R12R13Optimization of
CQI feedback periodAllRNC/CellThis is directly implemented by
on-site engineers.This is a standard solution and should be
implemented preferentially.Access parameter optimization (indoor
distribution)AllCell10 ms fixed PO optimizationAllRNCInternal
parameters are involved in versions earlier than R13.The link
release problem of IPhone 4R12RNCThe solution is merged into RNC
R12SPC516.State transition/EFDR12RNCThis affects KPIs.EFD is
implemented on a network with a high iPhone penetration rate.2 ms
fixed PO optimizationR10RNCThis needs to be analyzed by R&D
engineers.Internal parameters are involved.Value optimization of
SIB 7 broadcast RTWPR12CellThis is merged into NodeB
R12SPC430.HSUPA PO adaptive adjustmentR13RNCThis is used for 10 ms,
and not used with the fixed PO optimization at the same time.HSUPA
TTI selection and switchover solution enabled + 2 ms periodic retry
disabled.R10RNCHSUPA TTI selection and switchover solution includes
the TTI switchover realized on R10 and based on load, the TTI
switchover realized on R12 and based on admission CE, and the
access state TII selection realized on patch release R3 (RNC
R13SPH529).Reception using multiple antennasAllCell0.5/0.5
reconstructionAllCellMultiple-RRU demodulationR13NodeBHSUPA target
retransmission times changed to 10%.AllRNCThis is a non-standard
solution. It is recommended that on-site engineers select a site to
try first.PS R99 target BLER changed to 10%AllRNCDisable the HSUPA
2 ms function.R10RNC/NodeBLimit the maximum number of HSUPA users
in the cell.AllCell
&L&G&C&F&Rdocument secret level
&L&D&CHuawei secrets, no distribution without
permission&RPage &P, &N pages total
Optimization Solution SummaryNo.ClassParameterSupported
VersionControlled by a License or NotImpact RangeBaseline
ConfigurationAfter OptimizationInternal ParameterInvolved or
NotDescriptionEffectCommand1Feature algorithmHSUPA PO adaptive
reconfiguration enabledR13YesRNCOFFONNoIf the subscriber rate is
lower than a certain threshold, and the air interface load is
limited, increase the HSUPA reference PO to reduce the SIR working
point of lower rate subscribers, and to improve uplink
capacity.Gain: When the subscriber amount is large and the rate is
low, the gain of this feature is obvious. For example, more than
fifteen 10 ms subscribers that only have small amounts of data to
be retransmitted are online and uploading at the same time. If the
power offset of data channels for these subscribers all can be
adjusted, the HSUPA capacity of the cell can improve by more than
40% without object load increase, which is shown by the increase of
the average throughput or the increase of uplink data transmission
subscriber number at the same time.Risk: Four minutes are taken
from triggering to completion of this feature. The gain is not
obvious for frequently link-deleting/link-establishing subscribers
or subscribers with too short lasting time links.This is used for
10 ms, and not used with the fixed PO optimization at the same
time.MML Command on RNC:SET UCORRMALGOSWITCH:
PcSwitch=PC_HSUPA_DATA_CH_PO_ADAPTIVE_ADJ_SWITCH-1;If need to
rollback:SET UCORRMALGOSWITCH:
PcSwitch=PC_HSUPA_DATA_CH_PO_ADAPTIVE_ADJ_SWITCH-0;210 ms fixed PO
optimizationAllNoRNC//YesConfigure higher reference PO for 10 ms
TTI to reduce DPCCH SIR working point, and reduce the uplink cost
of the control channel. Therefore, the throughput of the HSUPA cell
with multiple subscribers is improved.Gain: For the lab test with
dual antennas, 75% uplink load target threshold, 18 online
subscribers and two uploading subscribers, the gain of the uplink
throughput in the cell is 15%.Risk: The peak rate of the HSUPA 10
ms subscriber in commercial network competition is slightly
affected.Versions earlier than R13 refer to internal parameter
modification. You need to obtain the commands for modifying
internal parameters from the PDT manager of the product line. It is
recommended that HSUPA PO adaptive adjustment is used on R13
version and later versions.32 ms fixed PO
optimizationAllNoRNC//YesConfigure higher reference PO for 10 ms
TTI to reduce DPCCH SIR working point, and reduce the uplink cost
of the control channel. Therefore, the throughput of the HSUPA cell
with multiple subscribers is improved.Gain: For the lab test with
dual antennas, 90% uplink load target threshold, 7 online
subscribers and two uploading subscribers, the gain of the uplink
throughput in the cell is 15%.Risk: The peak rate of the HSUPA 2 ms
subscriber in commercial network competition is greatly affected.If
internal parameters are involved, you need to obtain the commands
for modifying internal parameters from the PDT manager of the
product line.4HSUPA TTI selection and switchover solution enabled +
2 ms periodic retry disabled.TTI switchover based on
loadR10NoRNCThis is related to the configuration on the live
network.TTI switchover: ON2 ms periodic retry: OFFNoIf the air
interface load exceeds the target node, and 2 ms TTI is configured
for the service. the rate cannot reduce because the scheduling
algorithm guarantees one RLC PDU. The related minimum rate is 168
kbit/s (336) or 328 kbit/s (656). At this time if the TTI is
switched from 2 ms to 10 ms, the actual subscriber rate is reduced,
and also the cell load. The RTWP overshoot caused by data burst
because of high minimum rate of 2 ms subscribers is reduced. The 2
ms periodic retry is disabled to prevent TTI ping-pong
switchover.Gain: This reduces load when the uplink load resource is
severely limited, and reduces the RTWP.Risk: the peak rate is
affected after the subscriber switches to 10 ms.TTI switchover:
ONSET UCORRMALGOSWITCH:
DraSwitch=DRA_BASE_RES_BE_TTI_RECFG_SWITCH-1;2ms retry period OFF:
SET UFRC:
RETRYCAPABILITY=SRB_OVER_HSDPA-1&SRB_OVER_HSUPA-1&TTI_2MS-0&MIMO-1&64QAM-1&L2_ENHANCE-1&DTX_DRX-1&HSSCCH_LESS_OPERATION-1,TTI
switchover based on admissionR12NoRNCThis is related to the
configuration on the live network.TTI switchover: ON2 ms periodic
retry: OFFNoIn admission, the consumed admission CE of the 2 ms
subscriber is more than that of the 10 ms subscriber. Therefore,
when the admission CE is limited, switching the subscriber from 2
ms to 10 ms improves the admission subscriber number of the system.
The RTWP overshoot caused by data burst because of high minimum
rate of 2 ms subscribers is reduced. The 2 ms periodic retry is
disabled to prevent TTI ping-pong switchover.Gain: This alleviates
the admission CE congestion problem after 2 ms TTI is enabled, and
improves the subscriber number specification.Risk: the peak rate is
affected after the subscriber switches to 10 ms.TTI switchover:
ONSET UCORRMALGOSWITCH:
DraSwitch=DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH-1;2ms retry period
OFF: SET UFRC:
RETRYCAPABILITY=SRB_OVER_HSDPA-1&SRB_OVER_HSUPA-1&TTI_2MS-0&MIMO-1&64QAM-1&L2_ENHANCE-1&DTX_DRX-1&HSSCCH_LESS_OPERATION-1,TTI
selection of access stateRNC RAN13SPH529NoRNCThis is related to the
configuration on the live network.TTI switchover: ON2 ms periodic
retry: OFFNoThe HSUPA subscriber selects the initial TTI based on
the actual resource (RTWP/Iub/CE) congestion state. This prevents
that in the network with a large amount of subscribers, subscribers
access with 2 ms TTI all the time. Therefore, The RTWP overshoot
caused by data burst because of high minimum rate of 2 ms
subscribers reduces.Gain: The initial TTI is selected based on the
resource congestion state when the subscriber accesses. This
reduces reconfiguration signaling and improves power
efficiency.Risk: in the network with a few subscriber access and
high speed uplink transmission, the subscriber peak rate is
affected.TTI switchover: ONSET UCORRMPARA:
ReservedSwitch0=RESERVED_SWITCH_0_BIT2-1; (R13 uses the reserved
switch)5SolutionCQI feedback periodAllNoRNC/Cell28YesThe shorter
the CQI feedback period is, the better the downlink data
transmission is. The longer the CQI feedback period is, the lower
the load occupation is.Gain: On the office in country A, the CQI
feedback period is changed from 2 ms to 8 ms. After optimization,
the average value of the realtime traced RTWP is reduced by about 8
dB. The average RTWP value of hour-level traffic statistics is
reduced by about 10 dB.Risk: theoretically, this brings loss of
downlink throughput. After this solution is implemented on office A
and B, In the whole network view, no negative affections occur.If
internal parameters are involved, you need to obtain the commands
for modifying internal parameters from the PDT manager of the
product line.6EFD is recommended for the networks with high ratio
of state transition switch/iPhone.R12NoRNCOFFONNoTransit the
light-traffic subscribers to the FACH state, reduce dedicated
channel resources occupation of light-traffic subscribers, and
reduce uplink and downlink load. EFD is used for networks with high
iPhone penetration rates.Gain: The gain is related to traffic
models and the permanent online timer.Risk: This increases PS call
drop rate, and decreases the setup success rate of CS composite
services. Because the EFD is not compatible with other terminals,
currently only iPhone is recommended to be used.MML Command on
RNC:SET UCORRMALGOSWITCH:
DraSwitch=DRA_HSDPA_STATE_TRANS_SWITCH-1&DRA_HSUPA_STATE_TRANS_SWITCH-1&DRA_PS_BE_STATE_TRANS_SWITCH-1;7Reception
using multiple antennasAllNoCellThis is related to the
configuration on the live network.This is related to the
configuration on the live network.NoFor the same transmission rate,
the reception using multiple antennas reduces the signal power that
each antenna receives, that is, the uplink load. For the same load,
the reception using multiple antennas allows the UE to send larger
transmission blocks, which means the uplink capacity is
improved.Gain: Compared with reception using one antenna, reception
using two antennas improves the uplink capacity by more than 50%.
Compared with the dual-antenna reception, the four-antenna
reception improves the uplink capacity by more than 50%.Risk: No
for now.None80.5/0.5 reconstructionAllNoCellThis is related to the
configuration on the live network.This is related to the
configuration on the live network.NoThe dual-antenna demodulation
reception is realized on the baseband side. The baseband side and
the RF side do not merge raw data, and the RTWP is the same as that
in the regular dual-antenna cell.Gain: In the multi-area cell
networking, compared with the distributed cell, the 0.5/0.5
reconstruction does not have noise floor increase.Risk: The
stability of some RRUs is affected.9Multiple-RRU
demodulationR13NoNodeBThis is related to the configuration on the
live network.This is related to the configuration on the live
network.NoBasic principle: The NodeB independently demodulates and
merges several received RRU signals in the baseband processing
module, and duplicates a cell signal branch to several RRUs for
transmission.Gain: This improves cell capacity and throughput, and
reduces the times of subscriber handover between cells.Risk: More
baseband resource consumption.1. Use site configuration (ADD SITE)
to configure related site information.2. Use sector configuration
(ADD SEC) to select the sector type as MULTIRRU_SECTOR, select
uplink RRU number in RRU number, and fill in the related cabinet,
frame and slot for the RRU. A new sector type for independent
demodulation of multiple RRUs is added.3. Use uplink resource group
configuration (ADD ULGROUP) to configure the needed uplink board
resource. Note that for the resource group with independent
demodulation of multiple RRU, the demodulation mode is configured
as dual antennas (DEM_2_CHAN).4. Use downlink resource group
configuration (ADD DLGROUP) to configure the needed downlink board
resource.5. Use local cell configuration (ADD LOCELL) to select the
sector type as MULTIRRU_SECTOR. The RRU mode is configured as
UNSYNC (Part of RRUs in the sector are used) or SYNC (all RRUs are
in the sector are used) based on needs. Note that 2T cannot be
configured for the cell with independent demodulation of multiple
RRUs. The cell does not support MIMO, DC+MIMO far cell
configuration or desensitization intensity configuration. The
maximum cell radius is limited to 30 km, and the default value is
10 km.10HSUPA target retransmission times modification for 10 ms
(10%)AllNoRNC1%10%NoModify the 10 ms target retransmission times of
HSUPA from 1% to 10%.Non-standard solutionModifying the 10 ms
target retry to 10% affects subscriber peak rate. It is recommended
that this solution is carried out in the non-competition network or
networks that have no requirements for 10 ms peak rate.MML Command
on RNC:MOD UTYPRABOLPC: RabIndex=xx, SubflowIndex=xx,
TrchType=TRCH_EDCH_10MS, DelayClass=xx,
EdchTargetLittleRetransNum=100;11Target BLER modification for PS
R99 network (10%)NoRNC1%10%NoModify the BLER of PS subscribers in
the R99 network from 1% to 10%.Non-standard solutionIf you modify
the high-speed (such as 384 Kbit/s) BLER to 10%, the idle
subscriber peak rate is affected. It is recommended that the BLER
is modified based on the traffic mode and rate on the live
network.MML Command on RNC:MOD UTYPRABOLPC: RabIndex=xx,
SubFlowIndex=xx, TrchType=TRCH_DCH, DelayClass=xx,
BLERQuality=-10;12Reduce the maximum number of HSUPA subscribers in
the cell.NoCellThis is related to the configuration on the live
network.This is related to the configuration on the live
network.NoReduce the maximum number of HSUPA access subscribers in
the cell, and reduce the RTWP cost of HSUPA
subscribers.Non-standard solutionReduce the maximum number of HSUPA
access subscribers in the cell, and reduce the RTWP cost of HSUPA
subscribers. It is recommended that this solution is carried out in
the non-competition network.MML Command on RNC:MOD UCELLCAC:
CellId=xx, MaxHsupaUserNum=xx;If need to rollback:MOD UCELLCAC:
CellId=xx, MaxHsupaUserNum=xx;13Disable the HSUPA 2 ms
function.YesRNC/NodeBONOFFNodisabling the HSUPA 2 ms function makes
only 10 ms available for HSUPA subscribers.Non-standard
solutionDisabling the2 ms function affects subscriber peak rate. It
is recommended that the 2 ms function is modified in
non-competition network.MML Command on RNC:SET UCORRMALGOSWITCH:
MapSwitch=MAP_HSUPA_TTI_2MS_SWITCH-0;Or disable the HSUPA 2 ms
License on NodeB side14Access parameter modificationModify the
constant value of the initial transmit powerAllNoCell-20-30NoBasic
principle: By reducing the spike of the preamble open-loop power
control on the uplink RTWP in RACH initial access, the RTWP is
significantly reduced in the cell with frequent RACH access
(thousands of times per hour).Gain: After the Constantvalue
parameter is modified on the office in country C, the RTWP average
value is reduced by 3 dB to 4 dB. After PreambleRetransMax,
PowerRampStep and Mmax parameters are modified, the average RTWP
value is reduced by 1 dB.Risk: For indoor coverage scenarios, the
access delay increases.MML Command on RNC:MOD UPRACHUUPARAS:
CELLID=xx, PHYCHID=4, CONSTANTVALUE=-30, PREAMBLERETRANSMAX=40,
POWERRAMPSTEP=1;If rollback is needed:MOD UPRACHUUPARAS: CELLID=xx,
PHYCHID=4, CONSTANTVALUE=-20, PREAMBLERETRANSMAX=20,
POWERRAMPSTEP=2;MOD URACH: CellId=xx, TrChId=xx, NB01max=10,
Mmax=3;Preamble retry timesAllNoCell2040StepAllNoCell21Maximum
number of cyclesAllNoCell83Upper limit of random
rollbackAllNoCell01015Value optimization of SIB 7 broadcast
RTWPNodeB R12 SPC430NoCell-90This is based on the implementation
impact on the live network.NoReduce the spike of the preamble
open-loop power control on the uplink RTWP in RACH initial access,
especially in high load scenarios. The RTWP in SIB7 is broadcast in
real time. If you reduce the RTWP in SIB7, the effect is
essentially the same as that of reducing the Constvalue. Both are
for reducing the UE power of transmitting the first preamble.Gain:
After the RTWP value of SIB7 broadcast is optimized on the office
in country A, the average RTWP value is reduced by about 3 dB.
Risk: In the scenario with low load and not obvious RTWP spike
caused by RACH, each RACH access needs a large amount of preamble
ramp progress, which causes hundred-ms-level delay to
increase.Value optimization of SIB 7 broadcast RTWPMOD CABINET:
CN=x, CD="rtwpsw"16Special terminaliPhone4 problemRNC RAN12
SPC516NoRNCOFFONNoWhen iPhone releases the link, the iPhone
retransmits the RRC CONN REL CMP signaling message. However, the
network side releases the link before UE. As a result, the uplink
power control is abnormal and the RTWP spike occurs. Solution: When
iPhone releases the link, the network side delays to releasing the
link.Gain: The RTWP spike is reduced, especially for networks with
high iPhone penetration rates. After the solution is implemented on
the site in Thailand, the RTWP average value improves by about 3
dB. Risk: No for now.The solution is merged into RNC RAN12 SPC516
version.MML Command on RNC:SET URRCTRLSWITCH:
PROCESSSWITCH3=UM_RRCRELCMP_RLDEL_DELAY_SWITCH-1;Stands for
non-standard solution