UMTS UL&DL Capacity Improvement Solution V1R2.0-LAST

Security Level:

6/13/15

UL&DL Capacity Improvement Solution ：

UL&DL Capacity Improvement Solution Zhang Guoqiu 00136039

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

www.huawei.com

Background As MBB network developing, the increasing requirement for mobile bandwidth, the As MBB network developing, the increasing requirement for mobile bandwidth, the capacity capacity of ofwireless wirelessnetwork, network,especially especiallythe theradio radiocapacity(user/cell capacity(user/cellthroughput) throughput) become becomethe thebottleneck. bottleneck.How Howtotoprovide providemore morebig bigpipe pipecapacity capacitywith withlimited limitedresource, resource,ititisis question questionofofall alloperators operatorsand anddevice devicevender. vender. The influence factors for uplink throughput including RTWP, coverage, cell maximum The influence factors for uplink throughput including RTWP, coverage, cell maximum equivalent equivalentuser usernumber, number,HSUPA HSUPAuser usernumber, number,CE, CE,IUB IUBbandwidth... bandwidth... The influence factors for downlink throughput including TCP, BLER, HSDPA user number, The influence factors for downlink throughput including TCP, BLER, HSDPA user number, CE, CE,IUB IUBbandwidth... bandwidth... UL&DL capacity improvement service evaluate the network with tools quickly, discover UL&DL capacity improvement service evaluate the network with tools quickly, discover network networkbottleneck bottleneckinintime, time,dig digout outthe thepotential potential sale salechance, chance,improve improvecustomer customer satisfaction. satisfaction.

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Capacity Optimization Structure Optimization UL Radio capacity Limited

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Application Scenario

Value

Low throughput, poor user experience; Improve network competition.

Find out network bottleneck, improve user and cell throughput, improve user experience and TVO.

UL Device Capacity Limited

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DL Radio Capacity Limited

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UL Radio capacity Limited

UL Device Capacity Limited DL Device Capacity Limited DL Radio Capacity Limited

DL Device Capacity Limited

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Through professional tool, give out all the limited scenarios, than choose reasonable solution(Parameter/Fe ature/Expansion)

Operation Solution RNC RNC Script Script

RNC RNC Counter Counter NODEB NODEB Counter Counter

NODEB NODEB License License

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Scenario Output HUAWEI TECHNOLOGIES CO., LTD.

Tool Analysis Huawei Confidential

Log Collection

Uplink Scenarios Uplink Uplinkthroughput throughputisiseasy easyto tobe belimited limitedby byradio radioresource, resource,at atthe thesame sametime, time, device resource limited will also influent user throughput. device resource limited will also influent user throughput. Radio Radioresource resourceand anddevice deviceresource resourceare arerelatively relativelyindependent independentinin uplink uplinkcapacity capacityoptimization optimization: : Radio resource Limited Radio resource Limited   System Systeminterference interferencelimited limited  Target Load Limited  Target Load Limited   UE UECoverage CoverageLimited Limited Device resource Limited Device resource Limited   Equivalent Equivalentuser usernumber numberlimited limited  HSUPA user number limited  HSUPA user number limited   Admission AdmissionCE CELimited Limited  Physical CE Limited  Physical CE Limited   IUB IUBadmission admissionbandwidth bandwidthLimited Limited  IUB physical bandwidth Limited  IUB physical bandwidth Limited   IUB IUBQOS QOSLimited Limited  CPU/DSP  NODEB NODEB CPU/DSPLimited Limited

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UL Radio Optimization Whole Scenario Capacity Limit

Scenario system interference Limit

Sub-Scenario 　 transient background noise stable background noise

　

High R99 Load High HS-DPCCH Load

Radio Capacity Limit

Target Load Limit High HSUPA Load

High RRC Load

High RACH Load

UE Coverage Limit

UE TX power Limit

HUAWEI TECHNOLOGIES CO., LTD.

Optional Solution RF Troubleshooting anti-interference scheduling for HSUPA optimize background Noise automatically background noise update increase UL ROT multi-carrier expansion newsite expansion 4RX Diversity Independent demodulation of signals from multiple RRUs in one cell LDR based uplink radio load LDB Between multi-carrier CCPIC Optimization of R99 and HSUPA user fairness CQI feedback period optimization traffic-based activation and deactivation of the supplementary carrier in multicarrier HSUPA PO Optimization adaptive configuration of traffic channel power offset for HSUPA IC HSUPA adaptive transmission 2ms/10ms TTI switch based on RTWP Dual-threshold scheduling with HSUPA IC FDE L2+ 16QAM/E-DPCCH Boosting CPC DTX RRC request retransmission parameter optimization RRC connection retransmission parameter optimization Cell PCH FD/EFD RACH Access parameter optimzation F2P,F2H trigger threshold optimization F2P,F2H Timer Optimization HSUPA coverage enhanced at UE power limitation adaptive configuration of traffic channel power offset for HSUPA HSUPA adaptive transmission Coverage based E2D TTI switch for BE service base on coverage

Huawei Confidential

Solution Property

Versio n

troubleshooting

ALL

Feature

R13

parameter parameter parameter expansion expansion function Feature parameter parameter Feature feature parameter

ALL ALL ALL ALL ALL ALL R13 ALL ALL R10 R13 ALL

Feature

R13

parameter Feature Feature Feature parameter Feature Feature parameter parameter Feature parameter parameter parameter Feature parameter parameter parameter Feature Feature Feature Feature Feature

ALL R13 R12 R12 R12 R13 R12 R13 R13 R13 ALL ALL ALL R12 ALL ALL ALL R13 R13 R12 R12 R12

System Interference Solution(1/4) Solution1 : interference Troubleshooting

Description For high RTWP cell in free time, maybe due to external interference or RF engineering problem, See the “UMTS RTWP Troubleshooting Guide” to check interference and make optimizations. Pros & Cons 



Benefit: eliminate external interference, improve throughput and KPI. Disadvantage: None

Application Refer to the document: URFSTG01005-UMTS RTWP Troubleshooting Guide-V1R2.docx Link

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

System Interference Solution(2/4) Solution2 : RF optimization

Description For high RTWP cell with low service load in busy hour, maybe due to neighbor cell configuration or indoor antenna problem, suggest to do some RF optimization. Pros & Cons 



Benefit: decrease intra cell, inter cell or inter RAT cell interference, improve throughput and KPI, the gain depend on the strength of interference. Disadvantage: None.

Application Refer to the document: http://support.huawei.com/support/pages/kbcenter/view/product.do?actionFlag=deta ilProductSimple&web_doc_id=SE0000232054&doc_type=123-2&doc_type=123-2

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

System Interference Solution (3/4) Solution 3 : Automatically background noise update

Description If the RTWP is high in free hour, and customer can’t find the root cause and solve interference after RTWP troubleshooting. For the cell with stable background noise, you could synchronize the real background noise through “Automatically background noise update” algorithm, which will improve HSUPA available load. Fixed setting : -106 by default Automatic update : deliver the value detected during the night to Node B Pros & Cons  Benefit: - Keep the background noise consistent with the real value of background noise. - HSUPA available scheduling load may be increase. 

Disadvantage: - The background noise reference must be recorded without any user in the cell.

Application  RNC MML ： MOD UCELLCAC: BGNSwitch=ON, BGNAdjustTimeLen=120, BGNEqUserNumThd=0, BgnEndTime=06&00&00, HUAWEI TECHNOLOGIES CO., LTD. BgnStartTime=01&00&00, Huawei Confidential BgnUpdateThd=5, BgnAbnormalThd=100;

System Interference Solution(4/4) Solution 4 : HSUPA anti-interference scheduling (feature WRFD-020136)

Description: On commercial networks some site experience strong and random external UL interference. The traditional HSUPA scheduling algorithm considers only the total RTWP of a cell => available load resources are reduced and the HSUPA throughput decrease. With this feature, UEs HSUPA scheduling is performed based on the cell RTWP and traffic volume of HSUPA UEs in the cell. If the traffic volume (HSUPA and R99 users) is lower than the predefined threshold, HSUPA scheduling can be performed even if the ROT of the cell increases to a very high value.

Pros & Cons  

Benefit: Improve user throughput even though interference exist. Disadvantage: Real RTWP will increase, the KPI such as access, call drop may be degraded. If there is no interference, this feature is useless and has no impact on any KPIs.

Application

RNC MML ： MOD UCELLCAC: BackgroundNoise = 61; Baseline ： 61, equal -106dB. Manually update to the mean RTWP value in free hour HUAWEI TECHNOLOGIES CO.,toLTD. Huawei Confidential without users, it could get according to RNC counter. 

Target High UL Load Scenario Rule: Busy Hour: Cell MeanRTWP > Real Background Noise + Cell Target Load Or NODEB cell unhappy user proportion > 30% (Target Overload Limit)

HUAWEI TECHNOLOGIES CO., LTD.

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Target Overload Solution (1/13) Solution 1 : CQI feedback period optimization

Description: The uplink feedback channel HS-DPCCH of HSDPA consume part of uplink load More and more HSDPA user online at the same time in the cell (> 20 users); HSDPA uplink feedback channel contribute a big part of RTWP load. It is recommended to optimize HSDPA CQI feedback period, to reduce impact on uplink. Pros & Cons  Benefit: The CQI period is postponed => the Load of HS-DPCCH decrease => the available load for HSUPA will increase.  Disadvantage: if the CQI period is too long, it could not reflect the accurate channel quality on time and HSDPA throughput may be affected. Application  RNC MML ： RNC Level ：

SET UHSDPCCH:CQIFBCK=D8,CQIFBCKFORSHO=D8; (CQI feedback period from 2ms to 8ms)

Cell Level ：

ADD UCELLHSDPCCH: CELLID=xxx, CQIFbCk=D8, CQIFbCkforSHO=D8; HUAWEI TECHNOLOGIES CO., LTD.

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Target Overload Solution (2/13) Solution 2: Target ROT Optimization

Description: •

HSUPA scheduling depends on UL load. You can optimize the value of target ROT The Higher is the target load => the more load is available for HSUPA The defaulted target load is 75%, we suggest to modify to 90%.

Pros & Cons 

Benefit: HSUPA user number capacity and cell throughput will improve



Disadvantage: As the uplink load increase, the coverage will decrease. Call drop may degraded a the edge off the cell.

Application  RNC MML ： ADD UCELLHSUPA: MaxTargetUlLoadFactor=90; HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Target Overload Solution (3/13) Solution 3 : RACH access parameter optimization

Description: •

RACH access preamble adopt open-loop power control When the coverage is bad or massive RRC access exist => UE TX power could increase quickly involving RTWP peaks. • In order to control RTWP peaks, RACH access parameters could be optimized. (More effective for indoor massive user scenario) Pros & Cons 



Benefit: Reduce the sharp impact of preamble open-loop power control on uplink RTWP in initial RACH access. Cell mean RTWP should decrease. Disadvantage: the access delay may increase

Application  RNC MML ： MOD UPRACHUUPARAS: CellId=xxx, PhyChId=4, Constantvalue=-30, PowerRampStep=1, PreambleRetransMax=40;

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Access Parameter Optimized Value (default value) Constantvalue (-20) -30 PreambleRetransMa 40 x (20) PowerRampStep (2) 1 Mmax (8) 3 NB01max (0) 10

Target Overload Solution (4/13) Solution 4 : HSUPA 10ms BLER optimization

Description: •

The current target BLER value is benefit for HSUPA user with high throughput in good coverage.

•

If many users are online at the same time with low throughput => UE sends high power in order to transfer low throughput (bad power efficiency)

•

In that case target BLER optimization parameter from 1% to 10% is recommended which will  the UE Tx power and  the nb of TB retransmission

Pros & Cons 

Benefit: The uplink power efficiency will improved, HSUPA user throughput will increase, or RTWP may be decrease, KPI such call drop may improve.



Disadvantage: The parameter optimization may have negative affect for the user with real high throughput.

Application  RNC MML ： inner parameters, contact with HQ before using. HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Target Overload Solution (5/13) Solution 5 : HSPA state transfer

Description: •

In CELL_DCH state, when there is no data transmission, UE still need to send dedicated channel DPCCH and HS_DPCCH => control channel load is high when many users are online, and generates a big part of ROT.

•

After enabling HSPA state transfer switch, user will move to CELL_FACH or CELL_PCH state when there is low date transmission

Pros & Cons 



Benefit : some uplink load will be saved, control channel load and RTWP will decrease . Disadvantage : Time delay will and signaling could increase (cell reconfiguration), and the call drop may be degraded.

Application 

RNC MML ： SET UCORRMALGOSWITCH: DraSwitch=DRA_HSDPA_STATE_TRANS_SWITCH1&DRA_HSUPA_STATE_TRANS_SWITCH&DRA_PS_BE_STATE_TRANS_SWITCH-1

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Target Overload Solution (6/13) Solution 6: HSUPA CAC user number

Description: For current HSUPA PO configuration, HSUPA consume more load than R99 When there are many HSUPA users in a cell, HSUPA CAC user limitation could decrease uplink load (Nb of R99 users could increase) Pros & Cons 

Benefit: Uplink load may decrease, user throughput may be improved.



Disadvantage: If the value is too low, the cell HSDPA capacity may be reduces, leading to waste in HSUPA resources

Application  RNC MML ： MOD UCELLCAC: CellId=xxx, MaxHsupaUserNum=10; HUAWEI (default TECHNOLOGIES CO., LTD. Huawei Confidential = 20)

Target Overload Solution (7/13) Solution 7 : 2ms/10ms TTI switch based on RTWP + HSUPA 2ms period retry

Description: • HSUPA 2ms TTI provide better throughput but will easily involve RTWP peaks when data bursts appears, especially in dynamic CE active scenario. •

HSUPA 2ms TTI require more TX power, so we suggest to open 2ms/10ms TTI switch based on RTWP.

•

If 2ms period retry switch is on, massive 2ms/10ms ping-pong switch may exist in case of RTWP peaks => close the 2ms retry switch

Pros & Cons  Benefit: Uplink load may decrease.  Disadvantage: Lower throughput with TTI 10ms when the user have real high throughput requirement. Application  RNC MML ： SET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_RES_BE_TTI_RECFG_SWITCH-1; SET UFRC: RetryCapability=TTI_2MS-0;

HUAWEI TECHNOLOGIES CO., LTD.

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Target Overload Solution (8/13) Solution 8: traffic-based activation and deactivation of the supplementary carrier in multi-carrier

Description: This feature can deactivate the secondary carrier of a UE supporting DC-HSDPA when the traffic volume of DC-HSDPA is low. Deactivation of DC-HSDPA avoid redundant UL power of DC-HSDPA UE so as to decrease UL interference and save power for UE. Pros & Cons 

Benefit: save UE TX power consumption, decrease uplink load, improve HSUPA throughput.



Disadvantage: the time delay could increase for cell edge HSDPA user at none DC status.

Application  NODEB MML ： SET MACHSPARA: SECCELLACTDEASW=ON;

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Target Overload Solution (9/13) Solution 9: FDE

Description: With the HSUPA uplink frequency domain balancing feature, the NODEB uplink receiver reduces the multi-path interference of the E-DPDCH.  FDE increase the Signal Noise Ratio (S/N) of the E-DPDCH and the uplink resource usage efficiency This feature is adapted to hotspot or VIP zone which has high speed requirement. Pros & Cons 



Benefit: improve user throughput and cell capacity. Enhance a higher peak data rate for HSUPA users. Disadvantage: None.

Application  NODEB MML ： ADD LOCELL: LOCELL=xxx, FDE_MODE=TRUE;

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Target Overload Solution (10/13) Solution10: Independent demodulation of signals from multiple RRUs in one cell

Description: This feature reduces the number of inter-cell handovers by enabling independent demodulation and combination of signals at the baseband unit (BBU) for multiple RRUs in one cell. Coverage areas of multiple RRUs can be flexibly combined to form a linear coverage area when several cells are required to cover a high speed road for example or for indoor building coverage. Pros & Cons  Benefit: reduce the soft handover, improve cell capacity.  Disadvantage: more baseband resource are required. Application  NODEB MML ： ADD SEC: STN=0, SECN=0, SECT = MULTIRRU_SECTOR, RRUCOUNT=2, RRU1SRN=60, RRU2SRN=61;

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Target Overload Solution (11/13) Solution 11 : CCPIC phase1 & phase2 : Configuring Control Channel Parallel Interference Cancellation

Description: • For service with a low rate and low activity, the control channel of each user is a considerable interference source. • The UL DPCCHs are always on and form a substantial source of interference • CCPIC cancels the interference from uplink control channels DPCCH to improve the system capability. Pros & Cons  Benefit: reduce the interference of control channel DPCCH, increase the available uplink load, improve cell capacity.  Disadvantage: None. Application  NODEB License control, phase1 available from RAN10, Phase2 realize in RAN 14. HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Target Overload Solution (12/13) Solution 12: Multi-sector expansion

Description: In the scenarios of lack of frequency resource, hard to get new site, need high cost and long period for expansion, HUAWEI innovated multi-sector solution through flexible RRU topology, advanced split antenna and professional network planning and optimization.

Pros & Cons  Benefit: could solve radio congestion, improve uplink throughput, cell coverage and capacity. 

Disadvantage: more RRU and antenna resource needed, professional network planning and optimization required.

Application  Expansion, outdoor adaptive HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

Target Overload Solution (13/13) Solution 13 : Micro site expansion

Description: Micro site is flexible and easy to install, which could improve the coverage Pros & Cons 



Benefit: easy install, offload cell capacity, relieve congestion, improve user experience. Disadvantage: None.

Application 

Expansion, indoor adaptive

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

UE Coverage Limit

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

UE Coverage Limit Solution(1/3) Solution1: Coverage based 2ms/10ms TTI switch + HSUPA 2ms period retry

Description: •

• •

HSUPA 2ms has it is more sensitive to the bad coverage. => At the cell edge or weak coverage area, 2msTTI can involve call drop. Coverage based 2ms/10ms TTI switch is recommend. If 2ms period retry switch is on, massive 2ms/10ms ping-pong switch may exist, result in RTWP peaks => so close 2ms retry switch.

Pros & Cons  

Benefit: improve user experience, decrease call drop. Disadvantage: after switching from 2ms to 10ms TTI even if UE find back a good radio coverage, will stay in TTI 10ms mode with lower throughput.

Application RNC MML ： SET UCORRMALGOSWITCH: DraSwitch=DRA_BASE_COVER_BE_TTI_RECFG_SWITCH-1; UFRC: RetryCapability=TTI_2MS-0; HUAWEI SET TECHNOLOGIES CO., LTD. Huawei Confidential 

UE Coverage Limit Solution (3/3) Solution3: HSUPA E2D feature

Description: •

HSUPA feature improve user uplink throughput, but is more sensitive to radio coverage. After HSUPA activation, the HSUPA user at the edge of the cell has higher call drop rate and throughput limitation.

•

E2D algorithm reconfigure HSUPA user to DCH according to the coverage and throughput, make sure the user could transfer data successively.

Pros & Cons 



Benefit: decrease call drop, improve user experience in UE power limitation status. Disadvantage: Impact user experience for high throughout requirement

Application  RNC MML ： SET UCORRMALGOSWITCH: ReservedSwitch0=RESERVED_SWITCH_0_BIT51&RESERVED_SWITCH_0_BIT7-1; HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CAC user number Limit Rule: ENU utility > 60% and (UL power congestion exist or cell configured maximum ENU > 160), defined as ENU limited HSUPA user number > cell configured maximum HSUPA user number × 85 ％ , defined as HSUPA user number limited

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

UL Device Optimization Whole Scenario Capacity Scenario Limit Aspect

Equivalent user CAC User number number limited Limited HSUPA user number limited

CE Resource Limited

Device Resource Limited IUB Resource Limited

Solution Property

Version

increase equivalent user number

parameter

ALL

multicarrier/multisector/micro site expansion

expansion

ALL

increase HSUPA user number

parameter

ALL

60/96 HSUPA per cell CE Overbooking(R14)

feature feature

R12 R14

decrease GBR

parameter

ALL

feature

R12

feature expansion

R10 ALL

IUB overbooking

parameter

ALL

IUB expansion

expansion

ALL

packe loss and time delay valuation

troubleshootin ALL g

expansion

expansion

ALL

UTRP expansion

expansion

ALL

software upgrade

upgrade

ALL

Sub Scenario

Admission CE Limited

Physical CE Limited IUB admission bandwidth Limited IUB physical bandwidth Limited IUB QOS Limited NODEB WMPT CPU Limited

NODEB CPU/DSP NODEB WBBP Limited CPU Limited NODEB WBBP DSP Limited

HUAWEI TECHNOLOGIES CO., LTD.

Optional Solution

2ms/10ms TTI switch based on admission CE Dynamic CE CE expansion

WBBP expansion/resource group optimization/software upgrade

Huawei Confidential

ALL expansion ALL

CAC user Limit Solution (1/4) Solution 1: UL CAC ENU Optimization

Description: If the uplink CAC adopt algorithm-second, based on the equivalent user number, we can find user access fail because of user number limitation. If there is no other resource congestion, increasing the UL total equivalent user number from 95 to 120~200 is recommended.

Pros & Cons  

Benefit: More users can access the network. Disadvantage: Cell uplink load may increase, HSUPA throughput may decrease if overload happen, call drop may be also degraded.

Application 

RNC MML ： ADD UCELLCAC: UlTotalEqUserNum = 160;

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CAC user Limit Solution (2/4) Solution 2 : multi carrier/multi sector/micro site

Description: If there are available frequency resources, second carrier or three carrier expansion is recommended. If there are no frequency resources, suggest to adopt HUAWEI multi sector solution for outdoor and micro site for indoor scenarios. Pros & Cons  

Benefit: congestion will relieve, system capacity enhance. Disadvantage: more hardware cost.

Application 

Expansion

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CAC user Limit Solution (3/4) Solution3: HSUPA UL CAC user number (feature WRFD-01061211)

Description: HSUPA admission failure can be limited by cell maximum user number. If the number of HSUPA user is less than 20, it is suggested to expand to 20. Pros & Cons  Benefit: More users can access the network  Disadvantage: Cell uplink load will increase, so it is not suitable to target overload cell. Application  RNC MML ： MOD UCELLCAC: CellId=xxx, MaxHsupaUserNum = 20;

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CAC user Limit Solution (4/4) Solution4: 60/96 HSUPA User per cell (WRFD-010634 : 60 users, WRFD-010639: 96 users)

Description: If there are more than 20 HSUPA user, suggest to adopt 60/96 HSUPA user per cell feature, which allow more users to bear on EDCH. Pros & Cons  Benefit: congestion will relieve, user can reach high throughput.  Disadvantage: Cell uplink load will increase, so it is not suitable to target overload cell. Application  RNC MML ： MOD UCELLCAC: CellId=xxx, MaxHsupaUserNum=60;

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CE Resource Limit Rule: RNC Admission CE utility > 70% and CE congestion exists, define as admission CE limitation. NODEB license CE utility > 70% and CE congestion exists, define as license CE limitation.

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CE Resource Limit Solution (1/6) Solution1 : CE expansion

Description: Through network audit tools, identify the high CE utility and CE congestion site, expand WBBP and CE license. Pros & Cons 



Benefit: congestion will relieve, more user can access the network, user throughput will increase in License CE limitation scenario. Disadvantage: None.

Application 

Hardware and License expansion

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CE Resource Limit Solution (2/6) Solution2: Decrease GBR

Description: If the uplink throughput is low in live network and the default GBR is high, more CE resource will be reserved (low CE efficiency) => Decrease GBR from 64K to 32K, it will allowed more users to access the network. Pros & Cons  Benefit: congestion will decrease, more user can access the network. 

Disadvantage: Modifying the parameter may result in the user experience degradation for high speed user.

Application  RNC MML: SET UUSERGBR: TrafficClass=BACKGROUND, BearType=HSPA, UserPriority=GOLD, UlGBR=D32, DlGBR=D32;

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CE Resource Limit Solution (3/6) Solution 3 : State Transfer

Description: Open state transfer switch, allow the user without data transmission or low throughput transfer to CCH state (CELL_FACH, CELL_PCH) release the dedicated resource, let the CE to the user with more requirement. Pros & Cons 

Benefit: congestion will decrease, more user can access the network.



Disadvantage : call drop rate may be degraded as signaling increase, the time delay will degrade for high data transmission requirement user.

Application  RNC MML: SET UCORRMALGOSWITCH: DraSwitch=DRA_HSDPA_STATE_TRANS_SWITCH1&DRA_HSUPA_STATE_TRANS_SWITCHHUAWEI 1&DRA_PS_BE_STATE_TRANS_SWITCH-1; TECHNOLOGIES CO., LTD. Huawei Confidential

CE Resource Limit Solution(4/6) Solution4: TTI switch based on admission CE

Description: HSUPA 2ms require more admission CE than 10ms, active 2ms may result in admission CE congestion, influent user access. The feature switch 2ms HSUPA user on 10ms when CE resource is congested, which will allow more user to access the network, and improve the CE utility and KPI. Pros & Cons 

Benefit: CE congestion will decrease, more user can access the network.



Disadvantage: call drop rate may be degraded as signaling increase, the time delay will degrade for high data transmission requirement user.

Application  RNC MML: SET UCORRMALGOSWITCH: DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH-1; HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

CE Resource Limit Solution (5/6) Solution 5 : Dynamic CE (WRFD-010638)

Description: CE resources are hardware and limited resources of NODEB; HSUPA improved uplink throughput, but also consume more CE resources. Dynamic CE could improve CE utility and efficiency, and improve system capacity. Pros & Cons 

Benefit: congestion will relieve, CE utility will increase, user experience is improved



Disadvantage: As CE utility increases, uplink throughput will improve and uplink load will increase => cell coverage may shrink.

Application 

License control only

HUAWEI TECHNOLOGIES CO., LTD.

Huawei Confidential

CE Resource Limit Solution (6/6) Solution 6 : CE overbooking (WRFD-140212)

Description: After the dynamic CE resource management feature is enabled, the RNC generally ensures the GBR of HSUPA users and the resources required for data transmission. When the penetration rate of 2 ms TTI users is high and the actual UL HSUPA service volume is not high. This admission causes a low NODEB CE usage (waste of resources) This algorithm optimize the difference between admission credits reserved by RNC and actual CEs consumption reported by Node B, to allow more access users and improve the CE usage.

Pros & Cons 



Benefit: Relieves CE congestion during UE access, Increases the number of admitted UEs and the number of UEs with a 2 ms TTI, Increases cell throughput when Uu resources are sufficient. Disadvantage: None.

Application:

Depend on feature WRFD-010638 Dynamic CE Resource Management. When CE Overbooking is enabled, it is recommended that : DRA_BASE_ADM_CE_BE_TTI_RECFG_SWITCH under DraSwitch be turned on. HUAWEI TECHNOLOGIES CO., LTD. Huawei Confidential

IUB Resource Limit Rule: IP/ATM: UL UP assignment bandwidth utility > 70% and IUB UL congestion exists, define as IUB Admission Limit. IP/ATM:UL UP real bandwidth utility > 70%, define as IUB Physical Limit. UL IUB congestion time > 60, define as IUB QOS Limit.

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IUB Resource Limit Solution (1/2) Solution 1: transmission active factor optimization

Description If a site has only IUB admission bandwidth limitation, and the physical bandwidth utility is not high => decreasing the active factor of PS R99 and HSPA could allow more user to access the network. Pros & Cons  

Benefit: congestion will decrease, IUB real utility will increase. Disadvantage: IUB real bandwidth congestion may happen.

Application Active Factor adjustment From 100% to 50 %  RNC MML: ADD TRMFACTOR: FTI=11, PSINTERDL=50, PSINTERUL=50, PSBKGDL=50, PSBKGUL=50, HDINTERDL=50, HDBKGDL=50, HUINTERUL=50, HUBKGUL=50; // define new PS interactive and background services active factor index ADD ADJMAP: ANI=xxx, ITFT=IUB, FTI=11; // adjacent node uses the new index HUAWEI TECHNOLOGIES CO., LTD.

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IUB Resource Limit Solution (2/2) Solution2: Decrease GBR

Description: For the site with low user throughput, decrease GBR could allow more user to access the network. Pros & Cons  Refer to CE Resource Limit Solution (2/6) Application  Refer to CE Resource Limit Solution (2/6) Solution3: IUB expansion

Description: For the site with physical bandwidth limitation, suggest to expand transmission according to network audit result.

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NODEB CPU/DSP Limit Rule: CNBAP utility > 60% or RL fail > 60

Optimize Solution: Solution 1: URTP expansion

If WMPT CNBAP limited, expand UTRP could improve WMPT CNBAP capacity. Solution 2: WBBP expansion

If WBBP CNBAP limited, expand WBBP could improve WBBP CNBAP capacity. Solution 3: version upgrade

New NODEB software has optimization on CNBAP, could support higher CNBAP; for the CNBAP limited site, suggest to upgrade to new NODEB version.

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Downlink Scenarios According Accordingto tothe therequirement requirementfor fordownlink downlinkcapacity capacityimprovement, improvement,the thescenarios scenarios could be divided into two classes: throughput or user number improvement, could be divided into two classes: throughput or user number improvement,each each class include two aspects: radio and device resource, current version only has class include two aspects: radio and device resource, current version only hasaa consideration considerationof ofthroughput throughputoptimization optimizationand andcustomize customizesolution: solution: Radio Resource Limit Radio Resource Limit  Channel ChannelQuality QualityLimit Limit  TCP Load Limit  TCP Load Limit  BLER BLERLimit Limit Device Resource Limit Device Resource Limit  HSDPA HSDPAuser usernumber numberLimit Limit  CODE Limit  CODE Limit  Admission AdmissionCE CELimit Limit  License CE Limit  License CE Limit  IUB IUBBandwidth BandwidthLimit Limit  IUB QOS Limit  IUB QOS Limit

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DL Radio Optimization Whole Scenario Capacity Limit Aspect

Scenario

Channel Quality Limit

Sub Scenario

　

Common solution High RRC Load

High FACH Load

TCP Load Limit High R99 Load Radio Resource Limit

High HSDPA Load

High CCH Load BLER Limit

　 R99 Cell

Normal Cell

HSDPA Cell

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Solution Property

Version

parameter parameter parameter troubleshooting expansion parameter parameter expansion parameter feature parameter

ALL ALL ALL ALL ALL ALL ALL ALL ALL RAN12 RAN11

HSDPA status transfer timer optimization

parameter

ALL

HSDPA status transfer trigger threshold optimization

parameter

ALL

feature feature

RAN11 RAN12

feature

RAN10

parameter parameter feature feature feature parameter parameter parameter

RAN10 RAN10 RAN11 RAN13 RAN11 ALL ALL ALL

CQI Adjustment Based on Dynamic BLER Target

feature

RAN13

HSDPA TPE Downlink enhanced CELL FACH L2+ 64QAM MIMO DC 64QAM+MIMO DC+64QAM+MIMO

feature feature feature feature feature feature feature feature feature

RAN10 RAN12 RAN12 RAN11 RAN11 RAN11 RAN12 RAN12 RAN13

Optional Solution MPOC adjustment PCPICH power optimization Common channel optimization RF Optimization Expansion Decrease Power Margin Increase CAC Threshold Expansion LAC timer optimization Cell PCH/R8 FD FACH UE power control

CS over HSDPA SRB over HSDPA BE Rate decrease/inter frequency HO LDR Code Priority HSSCCH dynamic power control multi-carrier PA sharing MIMO Prime CPC HS-SCCH Less Operation PCPICH power adjustment Decrease common channel PO MPOC adjustment

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DL Device Optimization Whole Scenario Capacity Limit Aspect

Scenario

Child Scenario

HSDPA user number Limit

Version

Increase HSDPA CAC user number

parameter

ALL

Expansion

expansion

ALL

Decrease GBR

parameter

ALL

Decrease initial Rate

parameter

ALL

CE Expansion

expansion

ALL

Decrease GBR

parameter

ALL

Decrease initial Rate

parameter

ALL

Transmission Active Factor adjustment

parameter

　

IUB expansion

expansion

ALL

HSDPA flow control method adjustment

parameter

ALL

troubleshooting

ALL

power and code allocation method adjustment

parameter

ALL

Expansion

expansion

ALL

HS-PDSCH code expansion

expansion

ALL

RNC/NODEB HS-PDSCH code Dynamic allocation

parameter

ALL

code adjustment LDR

feature

RAN11

F-DPCH(SRB OVER HSDPA)

feature

RAN12

　

Admission CE Limit CE Resource Limit License CE Limit

IUB Bandwidth Limit Device Resource Limit

Solution Property

Optional Solution

IUB Resource Limit IUB QOS Limit

troubleshooting

　

CODE Limit

R99 Code Utility< 70%

R99 Code Utility> 70%

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Channel Quality Limit Rule: Cell reported mean CQI < 17, define as Channel Quality Limitation

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Channel Quality Limit Solution (1/5) Solution1: MPOC adjustment

Description MPO value was used when UE measure the CQI, MPOC setting will affect MPO value, unreasonable MPOC configuration, such as too large, will result in small CQI : MPO = min(13, Pcell-Pcpich - MPO constant) dB For commercial network, suggest to adopt default value, 2.5dB. Pros & Cons  Benefit: the CQI could reflect the real channel quality more precisely.  Disadvantage: None. Application  RNC MML: MOD UCELLHSDPA: CellId=xxx, HsPdschMPOConstEnum=2.5DB;

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Channel Quality Limit Solution(5/5) Solution 2 : Expansion

Description For the cell with high TCP load, if the CQI is low, suggest to improve CQI through expansion. If there are available frequency resources, multi-carriers expansion is recommended; In the scenarios of lack of frequency resource, hard to get new site, and high cost and long period for expansion, HUAWEI innovated multi-sector expansion for outdoor and indoor micro site. Pros & Cons  Benefit: system capacity enhance, CQI will be improved.  Disadvantage: None. Application  Expansion HUAWEI TECHNOLOGIES CO., LTD.

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TCP Load Limit Rule: R99 TCP utility > 70% or downlink congestion ratio > 1% or Total TCP utility > 80%, define as TCP load limit.

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TCP Load Limit Solution (1/9) Solution 1: Decrease Power Margin

Description Power Margin parameter is used to set the reserved power for R99 handover; In the low handover factor scenario, decrease the threshold will increase available load. Pros & Cons  

Benefit: Cell capacity enhance, user throughput will be improved. Disadvantage: R99 soft handover success rate may degrade.

Application  NODEB MML: SET MACHSPARA: PWRMGN=1; (Default Value 5)

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TCP Load Limit Solution (2/9) Solution 2 : Increase CAC Threshold

Description If cell load is high with some congestion, and if there is no other resources congestion :  Increasing downlink CAC threshold of 5% (from 80% to 85%) to decrease the congestion temporarily If the DL load of a cell is higher than this threshold => this service will be rejected Pros & Cons  

Benefit: More users could be served at the same time. Disadvantage: Total power congestion become more serious.

Application  RNC MML: MOD UCELLCAC: DlConvAMRThd=85, DlConvNonAMRThd=85, DlOtherThd=80, DlHOThd=90, DlCellTotalThd=95; HUAWEI TECHNOLOGIES CO., LTD.

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TCP Load Limit Solution (3/9) Solution 3 : Expansion

Description If there are frequency resources available , multi-carriers expansion is recommended; In the scenarios of lack of frequency resource, hard to get new site, and high cost and long period for expansion, HUAWEI innovated multi-sector expansion for outdoor and indoor micro site. Pros & Cons  

Benefit: System capacity increase, user experience improve. Disadvantage: None.

Application  Expansion

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TCP Load Limit Solution (4/9) Solution 4 : Cell PCH/R8 FD

Description As smart phone penetration increases : - More and more services and applications. - More and more users are online at the same time, which consume lots of power resource.

Signaling storm solution Cell PCH + R8 FD transfer more users to CELL_PCH and CELL_FACH state => RRC attempts and dedicated channel resource consumption decrease Pros & Cons 

Benefit: RRC attempts and dedicated channel users decrease, uplink load will be improved.



Disadvantage: When user need to transfer data again, it need to change to FACH or DCH state, time delay increase, signaling increase (Cell update, RB re-configuration)

Application 

Refer to the document: UMTS Signaling Storm Solution material package http://3ms.huawei.com/mm/docMaintain/mmMaintain.do?method=showMMDetail&f_id=UMTS201103230081

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TCP Load Limit Solution (5/9) Solution 5: HSDPA status transfer timer optimization

Description •

if FACH power is high, it is suggested to optimize the H2F timer when BE services is in the stable low activity state

Pros & Cons  

Benefit: Decrease cell power congestion. More users carry HSDPA Disadvantage : - If the value of this parameter is too low, it can not judge whether the UE is in low activity state. - If the value of this parameter is too high, the dedicated channel resources are wasted.

Application  RNC MML: SET UUESTATETRANSTIMER: BeH2FStateTransTimer=5.

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TCP Load Limit Solution (6/9) Solution 6 : HSDPA status transfer trigger threshold optimization

Description Optimize H2F/F2H trigger threshold: -

Increase the H2F 4B threshold and time to trigger Reduce the F2H 4A threshold and time to trigger

Pros & Cons  

Benefit: Relieve cell power congestion. More users carry HSDPA Disadvantage: When the service is carried on HSDPA, the associated DL SRB will consume extra power.

Application  RNC MML: SET UUESTATETRANS: BeH2FTvmThd=D512, BeH2FTvmTimeToTrig=D160, BeF2HTvmThd=D256, BeF2HTvmTimeToTrig=D100; HUAWEI TECHNOLOGIES CO., LTD.

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TCP Load Limit Solution (7/9) Solution 7 : SRB over HSDPA

Description • • •

Smartphone penetration increased, more and more HSDPA users are online at the same time. HSDPA SRB channel consumes a large amount of power. As the R8 terminal penetration increases, open the SRB over HSDPA feature can effectively reduce HSDPA DCH channel load consumption.

Pros & Cons  

Benefit: Relieve cell power congestion. Disadvantage: Current R8 terminal penetration is low, the gain may be not obvious.

Application 

RNC MML: SET UFRCCHLTYPEPARA: SrbChlType=HSDPA or SET UFRCCHLTYPEPARA: SrbChlType=HSPA;

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TCP Load Limit Solution(8/9) Solution 8 : BE Rate decrease/inter frequency HO LDR

Description If the load occupied by R99 in a cell is high, resulting => TCP will be limited Open the LDR algorithm based on downlink power and : - reduce BE service rate, - or switch users to inter frequency cell Pros & Cons  

Benefit: reduce the R99 power => Relieve cell power congestion. Disadvantage: R99 user experience may degrade.

Application 

RNC MML: ADD UCELLLDR: DlLdrSecondAction=InterFreqLDHO, DlLdrThirdAction=BERateRed;

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TCP Load Limit Solution (9/9) Solution 9 : HS-SCCH dynamic power control

Description Dynamic HS-SCCH power control execute power control based on CQI. •

When CQI channel quality is good, send with lower power to reduce the control channel overhead;

•

When the CQI channel quality is poor, then use higher power to ensure coverage.

This feature eases the power limited at good coverage scene. Pros & Cons 



Benefit: eases the power consumption when the coverage is good, Relieve cell power congestion. Disadvantage: None.

Application  NODEB MML: SET MACHSPARA: HSSCCHPWRCMINDCH=CQI; HUAWEI TECHNOLOGIES CO., LTD.

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BLER Limit Rule: Cell mean BLER > 20%, define as BLER Limit.

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BLER Limit Solution (1/2) Solution1: MPOC adjustment

Description The unreasonable MPOC configuration will result in the UE-reported CQI distortion, BLER is high. Pros & Cons  

Benefit: BLER decrease, user throughput increase. Disadvantage: None.

Application 

RNC MML: MOD UCELLHSDPA: CellId=xxx, HsPdschMPOConstEnum=2.5DB;

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BLER Limit Solution(2/2) Solution2: CQI adjustment based on BLER

Description This algorithm can dynamically identify the channel environment, determine the optimum schedule BLER (SBLER) target, and correct the CQI based on the target value to obtain the maximum uplink throughput rate. Pros & Cons  

Benefit: BLER decrease, user throughput increase. Disadvantage: None.

Application 

NODEB MML: SET MACHSPARA:CQIADJALGOFNONCON=CQI_ADJ_BY_DYN_BLER;

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Service Procedure  Capacity Capacityimprovement improvementcan canbe be delivered as the procedure delivered as the procedure illustrated illustratedininthe thefigure, figure,ititincludes includes the following steps: the following steps:  Customer Customerdemand demandacquisition acquisition  Network data collection  Network data collection  Tool Tooldata dataanalysis analysis  Evaluated  Evaluatedscene sceneoutput output  customize optimization  customize optimizationsolution solution  evaluation Effect Effect evaluation  Case  Casesummary summary&communication &communication

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Tool Usage Method

Data Datacollection: collection:  RNC MML script(inner, mandatory) RNC MML script(inner, mandatory)  RNC Performance(mandatory) RNC Performance(mandatory)  NODEB Performance(optional, without the data, some scenarios will be NODEB Performance(optional, without the data, some scenarios will be empty) empty)  NODEB License File(mandatory) NODEB License File(mandatory) Customize Customizesolution solutionbased basedon onscenarios: scenarios:  Uplink refer to “URFSTG01181-Technical Guide to UMTS Uplink Capacity Uplink refer to “URFSTG01181-Technical Guide to UMTS Uplink Capacity Improvement-V100R002”. Improvement-V100R002”.  Downlink refer to “URFSTG01182-Technical Guide to UMTS Downlink Downlink refer to “URFSTG01182-Technical Guide to UMTS Downlink Capacity CapacityImprovement-V1R2”. Improvement-V1R2”.

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