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Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
Ttsl orissa-egprs-download-throughput-improved-new
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Ttsl orissa-egprs-download-throughput-improved-new

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Helpful for those who wanted to optimize Data networks.

Helpful for those who wanted to optimize Data networks.

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  • 1. GPRS/EGPRS Download Throughput Improved For TTSL Orissa Project 1. BVC Flow Control(BSC)................................................................................................................3 2. GPRS Cell Options(Cell)................................................................................................................5 3. SIGNAL_EUTBF : Support signaling uplink extended TBF(BSC)..............................................7 4. EXT_UTBF: Support extended uplink TBF(Cell).........................................................................8 Copyright, 2009 ZTE Corporation.
  • 2. 5. Cell Reselecting Hysteresis Level(Cell).........................................................................................9 6. Edge Params(Cell)...........................................................................................................................9 7. GPRS MAX initial access signal level..........................................................................................11 8 The parameter of GPRS Property1(BSC Level) changed..............................................................11 9 The parameter of EDGE Property(BSC Level) changed...............................................................12 10 The parameter of Site Bandwidth Limit(Cell Level) changed....................................................13 11. UPPB-DSP Congestion audit......................................................................................................14 12. The PDTCH Configuration(Cell Level) Moved.........................................................................18 13. The PDTCH Configuration(Cell Level) changed for 3 PDTCHs..............................................19 14. The Throughput Improved for 3 PDTCHs..................................................................................22 15. The PDTCH Configuration(Cell Level) changed for 2 PDTCHs..............................................23 16. The Throughput Improved for 2 PDTCHs..................................................................................25 17. Test Conclusion of EGPRS Download Throughput...................................................................27 Copyright, 2009 ZTE Corporation.
  • 3. 1. BVC Flow Control(BSC) BVCFlowCtrl: BVC Flow Control Supported BVC flow control occurs on Gb interface between SGSN and BSS, and only on downlinks. BSS provides control parameters and SGSN executes, to avoid one BVC on BSS to abandon some LLC data because of discard some LLC data blocks due to overtime caused from grouping channel as too busy and to avoid new downlink LLC data because of memory resource limitations. BSSGP counts the current leaking rate of BVC periodically (including short ;;statistics and long statistics). BVCFlowCtrl originates unconditionally if long statistics timer stops, SGSN acknowledgement is necessary, and if discrepant range of adjacent leaking rates is over CellFcThs. BVCFlowCtrl originates and SGSN confirmation is necessary if short statistics timer overflows and discrepant range of adjacent leaking rates is over CellFcThs. 1). FlowCtrlMode: Flow Control Mode There are two Modes to determine the SGSN flow control of different providers.  Mode 1: Report flow control parameters according to actual traffic on radio interface counted at BSC  Mode 2: Report flow control parameters according to max traffic that the cell can provide Suggestion value: Normally, we use Mode 2. 2). FlowCtlMode2Para:Parameter of Flow Control Mode2 BSC reports flow control parameters according to max traffic that the cell can provide. Max value depends on channels configured. Counting formula: channels * max traffic that every channel can provide. This parameter is max traffic that every channel can provide, with the unit of 100 bps. Value range: 10 ~ 1000 Default value: 214 Copyright, 2009 ZTE Corporation.
  • 4. The Normal Value of FlowCtlMode2Para for EGPRS as below Code Set Throughput per TS FlowCtlMode2Para MCS -1 8.8 kbps 88 MCS -2 11.2 kbps 112 MCS -3 14.8 kbps 148 MCS -4 17.6 kbps 176 MCS -5 22.4 kbps 224 MCS -6 29.6 kbps 296 MCS -7 44.8 kbps 448 MCS -8 56.4 kbps 564 MCS -9 59.2 kbps 592 The Normal Value of FlowCtlMode2Para for GPRS as below Co de Set Through put per TS FlowCtlMode2 Para CS- 1 9.05 kbps 90 CS- 2 13.4 kbps 134 CS- 3 15.6 kbps 156 CS- 4 21.4 kbps 214 Suggestion value: for EGPRS set to 800. Copyright, 2009 ZTE Corporation.
  • 5. 2. GPRS Cell Options(Cell) 1). T3192: T3192 timer T3192 is used at MS side. During the packet downlink transmission, if RLC data block is the final downlink data block to be transmitted, the network sends the RLC data block with the Final Block Identifier (FBI) domain as 1. It contains an effective RRBP field to initialize the release of the downlink TBF. In acknowledged mode, the MS sends PACKET DOWNLINK ACK/NACK message whose FBI domain is 1 on the uplink block specified by the RRBP domain. In the unacknowledged mode, the MS sends PACKET CONTROL ACK message on the uplink block specified by the RRBP domain. Then MS starts the T3192 timer. When T3192 stops, the system releases the resources, stops listening to the PDCCH channel, and turns to listen the paging channel. If a MS receives PACKET DOWNLINK ASSIGNMENT or PACKET TIMESLOT RECONFIGURE message from the network within the protection period of the T3192 timer, it stops T3192 and transfer to the packet transmission status. Value range:{ 500, 1000, 1500,0,80,120,160,200} Default value: 500ms Timer value must be less than the protection timer T3193 of the downlink TBF at the network side, in order to ensure TFI uniqueness of MS at the same time. Suggestion value: 1500ms for T3192, 1520ms for T3193 Copyright, 2009 ZTE Corporation.
  • 6. 2). DrxTimeMax: Non-DRX Mode Holding Time This parameter belongs to GPRS cell option and is used at MS side. When the MS changes from the packet BUSY mode to the packet IDLE mode, it should first enter the Non-Drx mode. The DRX_TIMER_MAX parameters determine the maximum time length for MS to stay in the Non-DRx mode. Under the Non-Drx mode status, MS establish TBF link take short time than Drx mode status, refer to GSM04.60-12.24 Value range: {1 s , 2 s, 4 s , 8 s , 16 s , 32 s , 64 s } Default value: 2 s Suggestion value: 4s 3). BsCvMax: Max Blocks Transmission in Each TS This parameter belongs to GPRS cell option and is used at MS side. BsCvMax indicates the value of BsCvMax parameter of Max Blocks Transmission in each TS. This parameter determines the following:  Time length of T3198 timer used by MS. This time length is equal to the time represented by BsCvMax.  Time length of T3200 used by MS in Non-Drx mode. This time length = 4 × time represented by BsCvMax.  Value of N3104max = (3 × (BsCvMax+3) × Number of timeslots assigned in the uplink). All uplink data blocks sent by MS contain the COUNT DOWN VALUE (CV) field. The network can use this field to calculate the data blocks to be sent on current uplink TBF. Value range: Default value: 15 Suggestion value: some MS Copyright, 2009 ZTE Corporation. Value Meaning 0 Time length of one block 1 Time length of one block … … 15 Time length of 15 blocks
  • 7. can only support 0-12, so change 15 to 9. 3. SIGNAL_EUTBF : Support signaling uplink extended TBF(BSC) This parameter represents whether BSC supports signaling uplink extended TBF. Normally, the uplink signaling message transmission was finished, uplink TBF link was released immediately to free TFI resource. Uplink signaling extended TBF enabled can hold the link and TFI resource for some time, if MS needs transmission signaling again, it can use the TFI resource. The uplink TBF established constantly will affect downlink throughput. Value range: Check/Uncheck Check: Support signaling uplink extended TBF Uncheck: Does not support signaling uplink extended TBF Default value: Uncheck, Suggestion value: Check Copyright, 2009 ZTE Corporation.
  • 8. 4. EXT_UTBF: Support extended uplink TBF(Cell) This parameter represents whether extended uplink TBF is supported in the cell. If support extended uplink TBF, after uplink TBF link have sent last RLC data block, the link don’t release for short time, if there have data to send, the link will be used, new TBF link establishment is not necessary, it save the time to load data. Value range: Check/Uncheck Check: extended uplink TBF is active in cell; Uncheck: extended uplink TBF is not active in cell Default value: Uncheck, Suggestion value: Check Copyright, 2009 ZTE Corporation.
  • 9. 5. Cell Reselecting Hysteresis Level(Cell) If Mobile is in data service and does Cell Reselection, the MS will stop data transmission about 4- 10seconds. In order to decrease cell reselection, need to increase the ReselHysteresis parameter to avoid cell reselection frequently. 6. Edge Params(Cell) 1). Support EGPRS_PACKET_CHANNEL_REQUEST Access Program (EGPRSPacketChReq) If Cell supports EGPRS_PACKET_CHANNEL_REQUEST Access Program, EGPRS mobile can set up packet access program on RACH or PRACH(if PBCCH is configured) Enabled this function can improve uplink throughput. Value range: Check/Uncheck Check: EGPRS_PACKET_CHANNEL_REQUEST Access Program is active in cell; Uncheck: EGPRS_PACKET_CHANNEL_REQUEST Access Program is not active in cell Copyright, 2009 ZTE Corporation.
  • 10. Default value: Uncheck, Suggestion value: Check 2). EGPRS Phone Quality Measure Mode (LinkQuaMeaMode) LinkQuaMeaMode indicates the measurement report mode of EGPRS MS in the cell. EGPRS measurement could be performed based on each impulse, which is to measure by the granularity of BURST. The feature of rapid EGPRS measurement makes the network side be able to respond the change of radio environment quickly. EGPRS MS have two kinds of report mode, based on BURST or based on TBF. Reporting parameters based on BURST are MEAN_BEP_TNx ( 0-7) (error bit rate per time slot)and I_LEVEL_TN(0-7). Reporting parameters based on TBF are MEAN_BEP (average error bit rate of the radio block) and CV_BEP (variance coefficient of radio block error bit rate). Value range: 0-3. 0. Report MEAN_BEP and CV_BEP 1. Only report I_LEVEL_TN(0-7) 2. Only report MEAN_BEP_TNx(0-7) 3. Report MEAN_BEP_TNx(0-7)and I_LEVEL_TN(0-7) Default value: 2 In report mode, 0 means report based on TBF, 1~3 means report based on timeslot(BURST). Currently in report based on timeslot, omission of report occurs at some terminals, which seriously affects adjustment of coding mode(MCS1-9) Suggestion: 0 based on TBF report mode. 3). Average filter period for uplink/downlink BEP In EGPRS system, EGPRS MS will determine to report the MEAN_REP_AV (average error bit rate of the radio block) and CV_BEP_AV (variance coefficient of radio block error bit rate) under the whole TBF, or the measurement data per time slot MEAN_BEP_TNx (0-7). The specification defines the formula of these measurement data (refer to GSM05.08 10.2.3.2.1). There is an oblivion factor e, whose value is defined by average period of BEP filter. Average filter period for BEP calculation is an oblivion factor e, it is the weight of measurement report, the value is more, and the reliability of BEP is high. Value Range: Average filter period for downlink BEP {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,14, 15}, Average filter period for uplink BEP {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10} Default value: both are 4 blocks. Suggestion value: both are 10 blocks. Copyright, 2009 ZTE Corporation.
  • 11. 7. GPRS MAX initial access signal level GPRS MAX initial access signal level set to 5 for GSM900MHz, set to 2 for DCS1800MHz. Suggestion value: Changing it from 5 to 2. 8 The parameter of GPRS Property1(BSC Level) changed Copyright, 2009 ZTE Corporation.
  • 12. 9 The parameter of EDGE Property(BSC Level) changed In order to improve the GPRSEGPRS throughput, we suggest changing below parameter to BSC. The group parameter of EDGE Property is as below. (Notes: these parameter are only available for iBSC, for V2 BSC they are not working). RS: Uplink throughput weight value at Gb interface, the dynamic Abis adjustment parameter. RR: Downlink throughput weight value at Gb interface, the dynamic Abis adjustment parameter. RA: Weight value of EGPRS MS accessing request times, the dynamic Abis adjustment parameter. RM: Weight value of high-bandwidth request times, the dynamic Abis adjustment parameter. RB: Weight value of the highest bandwidth usage, the dynamic Abis adjustment parameter. RG and RE: This parameter defines weights of GPRS carrier proportion, RS+RR+RA+RM+RB+RG+RE must be equal to 100 Copyright, 2009 ZTE Corporation.
  • 13. Figure: Edge Property parameters 10 The parameter of Site Bandwidth Limit(Cell Level) changed In order to give effective control, we will change the Site parameter of Bandwidth Limit(kb) as below. Copyright, 2009 ZTE Corporation.
  • 14. Figure: Site Bandwidth Limit parameter. 11. UPPB-DSP Congestion audit Normally, we can use below formula to check GPRS/EGPRS congestion. 1). RR Resource(PDTCH) Congestion Rate (C901170008+ C901170037+ C901180008+ C901180037+ C901190016+ C901190065+ C901200016+ C901200065)*100/(C900040108+C900040112+C900040114+ C900040118+ C900040120+ C900040126 + C900040128+ C900040134) ([Number of GPRS DL TBF establishment failure due to RR congestion]+[Number of GPRS DL TBF resource reallocation failure due to RR congestion for LLC transmission]+[Number of EGPRS DL TBF establishment failure due to RR congestion]+[Number of EGPRS DL TBF resource reallocation failure due to RR congestion for LLC transmission]+[Number of GPRS UL TBF establishment failure due to RR congestion]+[Number of GPRS UL TBF resource reallocation failure due to RR congestion for resource request]+[Number of EGPRS UL TBF establishment failure due to RR congestion]+[Number of EGPRS UL TBF resource reallocation failure due to RR congestion for resource request])/([Number of GPRS DL TBF establishment requests]+[Number of GPRS DL TBF resource reallocation requests due to LLC transmission]+ Copyright, 2009 ZTE Corporation.
  • 15. [Number of EGPRS DL TBF establishment requests]+[Number of EGPRS DL TBF resource reallocation requests due to LLC transmission]+[Number of GPRS UL TBF establishment requests]+[Number of GPRS UL TBF resource reallocation requests for resource request]+ [Number of EGPRS UL TBF establishment requests]+[Number of EGPRS UL TBF resource reallocation requests for resource request]) 2). Abis Resource Congestion Rate (C901170007+ C901170036+ C901180007+ C901180036+ C901190015+ C901190064+ C901200015+ C901200064)*100/(C900040108+C900040112+C900040114+ C900040118+ C900040120+ C900040126 + C900040128+ C900040134) ([Number of GPRS DL TBF establishment failure due to Abis congestion]+[Number of GPRS DL TBF resource reallocation failure due to Abis congestion for LLC transmission]+[Number of EGPRS DL TBF establishment failure due to Abis congestion]+[Number of EGPRS DL TBF resource reallocation failure due to Abis congestion for LLC transmission]+[Number of GPRS UL TBF establishment failure due to Abis congestion]+[Number of GPRS UL TBF resource reallocation failure due to Abis congestion for resource request]+[Number of EGPRS UL TBF establishment failure due to Abis congestion]+[Number of EGPRS UL TBF resource reallocation failure due to Abis congestion for resource request])/([Number of GPRS DL TBF establishment requests]+[Number of GPRS DL TBF resource reallocation requests due to LLC transmission]+ [Number of EGPRS DL TBF establishment requests]+[Number of EGPRS DL TBF resource reallocation requests due to LLC transmission]+[Number of GPRS UL TBF establishment requests]+[Number of GPRS UL TBF resource reallocation requests for resource request]+ [Number of EGPRS UL TBF establishment requests]+[Number of EGPRS UL TBF resource reallocation requests for resource request]) 3). UPPB DSP Resource Congestion Rate One UPPB have 14 DSP Units, the maximum process capacity of each DSP is 160 Abis TS of 16kbps( one DSP = 160*16kbps), if enable GPRS CS3/4, one DSP can support maximum 80 dynamic and static channels, if open EDGE service, one DSP can support maximum 40 dynamic and static channels. If DSP overload, some PDTCH will not be occupied, that means you have configured 4 static PDTCH channels, you can only occupy less than 4 PDTCH channels. Suggestion: there can configure 10 to 15 sectors to one DSP in UPPB board. (C901170009+ C901170038+ C901180009+ C901180038+ C901190017+ C901190066+ C901200017+ C901200066)*100/(C900040108+C900040112+C900040114+ C900040118+ C900040120+ C900040126 + C900040128+ C900040134) ([Number of GPRS DL TBF establishment failure due to UPPB-DSP channel congestion]+ [Number of GPRS DL TBF resource reallocation failure due to UPPB-DSP channel congestion for LLC transmission]+[Number of EGPRS DL TBF establishment failure due to UPPB-DSP channel congestion]+[Number of EGPRS DL TBF resource reallocation failure due to UPPB-DSP channel congestion for LLC transmission]+[Number of GPRS UL TBF establishment failure due to Copyright, 2009 ZTE Corporation.
  • 16. UPPB-DSP channel congestion]+[Number of GPRS UL TBF resource reallocation failure due to UPPB-DSP channel congestion for resource request]+[Number of EGPRS UL TBF establishment failure due to UPPB-DSP channel congestion]+[Number of EGPRS UL TBF resource reallocation failure due to UPPB-DSP channel congestion for resource request])/([Number of GPRS DL TBF establishment requests]+[Number of GPRS DL TBF resource reallocation requests due to LLC transmission]+[Number of EGPRS DL TBF establishment requests]+[Number of EGPRS DL TBF resource reallocation requests due to LLC transmission]+[Number of GPRS UL TBF establishment requests]+[Number of GPRS UL TBF resource reallocation requests for resource request]+[Number of EGPRS UL TBF establishment requests]+[Number of EGPRS UL TBF resource reallocation requests for resource request]) 4) The Max Simultaneous Existing TBF numbers C901000048 Downlink Max GPRS TBF Number of Simultaneous Establishment C901000050 Downlink Max EGPRS TBF Number of Simultaneous Establishment C901010046 Uplink Max GPRS TBF Number of Simultaneous Establishment C901010048 Uplink Max EGPRS TBF Number of Simultaneous Establishment 5) PDTCH Utillization C900040140/ C900040136 We had defined above formula and exported performance data, and found the UPPB-DSP have congestion for some cells. BSC ID SITE ID Bts ID local cell ID UPPB DSP Resource Congestio n Rate% Belong to DSP No 1 8 2 30172 5.81% 11 1 48 1 30461 50.00% 11 1 116 1 30851 7.69% 9 1 22 1 30351 12.50% 10 1 39 2 30522 5.88% 11 1 89 3 30933 6.67% 14 1 24 3 30233 8.57% 10 1 142 1 30911 5.88% 9 1 151 3 31173 11.76% 9 1 24 3 30233 5.95% 10 1 21 3 30593 12.82% 10 1 43 3 30513 7.69% 11 1 48 3 30463 5.56% 11 1 21 3 30593 18.18% 10 1 40 4 30384 12.50% 11 1 71 3 33243 20.00% 13 1 77 3 33043 5.26% 11 1 21 3 30593 8.45% 10 Copyright, 2009 ZTE Corporation.
  • 17. 1 24 3 30233 9.88% 10 1 208 1 43361 9.68% 13 1 118 3 30663 6.38% 9 1 141 2 31162 9.52% 9 1 8 3 30173 11.36% 11 1 21 3 30593 17.24% 10 1 74 2 33422 25.00% 13 1 120 2 30992 5.26% 9 1 144 3 33573 6.12% 9 1 8 2 30172 10.34% 11 1 35 1 30341 8.11% 11 1 38 1 30061 16.00% 11 1 39 1 30521 9.09% 11 1 43 3 30513 6.67% 11 1 6 1 30211 5.56% 11 1 27 2 31582 6.25% 11 1 47 3 30453 7.14% 11 1 6 1 30211 8.70% 11 1 90 1 30811 12.50% 14 1 24 3 30233 5.88% 10 1 128 3 30713 8.33% 9 1 162 1 33561 6.25% 9 From OMCR we can export Network Planning Data table, and fond DSP No. the cell belong to. From above table, we can statistic how many sectors connected to the DSP. DSP NO. Total Sector Numbers 0 1 Copyright, 2009 ZTE Corporation.
  • 18. 9 75 10 68 11 67 12 19 13 71 14 55 15 6 16 97 17 20 18 21 19 13 20 33 21 12 22 1 From above table, we know the DSP 9,10,11,13,14 and 16 have more sectors connected to them. The DSP 16 have 97 cells connected to it, because there have a few subscriber to use GPRS service, so there haven’t DSP congestion. So we suggest move above DSP congestion cells to DSP 15,19,21,22 to balance the DSP process loading. As below, we changed the configuration of DSP, the DSP congestion is improved. 12. The PDTCH Configuration(Cell Level) Moved The Dynamic TS property used to provide more PDTCH to support data transmit, if the TCH channel is enough to support voice service, the system will shift to dynamic TCH timeslots to PDTCH. The shift action will happen at the before or back TCHs at the static PDTCH channel. If you configure as below figuration, the system only shift the before dynamic TCH timeslots to PDTCH, for this case, some shift actions will failure, because the USF flag bit can’t be moved to other PDTCHs. Copyright, 2009 ZTE Corporation.
  • 19. Figure: the Dynamic TS property only can shift forth TCH to PDTCH. So we suggest move the static PDTCH to the middle between the TCHs with Dynamic TS, the system is easy to shift the back or forth TCHs with dynamic TS property to PDTCH. The configuration is as below. Figure: the Dynamic TS property can shift both the back or forth TCH to PDTCH. 13. The PDTCH Configuration(Cell Level) changed for 3 PDTCHs Because the modulations of GPRS(CS-1 to CS-4) and EGPRS(MCS-1 to MCS-4) are GMSK, and EGPRS(MCS-5 to MCS-6) is with 8-PSK modulation. The 8-PSK gives the EGPRS high throughput, if EGPRS and GPRS are same with GMSK, the throughput of EGPRS will be lower than the GPRS. Table: the Modulation and Bit Rate of GPRS and EGPRS. Modulative Mode Coding scheme modulation RLC Blks/Ra dio Blk FEC Code Rate User bits/20ms bit Rate (bps) Family GPRS CS-1 GMSK 1 0.45 160 8,000 - CS-2 1 0.65 240 12,000 - CS-3 1 0.75 288 14,400 - Copyright, 2009 ZTE Corporation.
  • 20. CS-4 1 1 400 20,000 - EGPRS MCS-1 1 0.53 176 8,800 C MCS-2 1 0.66 224 11,200 B MCS-3 1 0.85 296 14,800 A MCS-4 1 1 352 17,600 C MCS-5 8-PSK 1 0.38 448 22,400 B MCS-6 1 0.49 592 29,600 A MCS-7 2 0.76 448+448 44,800 B MCS-8 2 0.92 544+544 54,400 A MCS-9 2 1 592+592 59,200 A We configure the PDTCH to the site with both GPRS and EGPRS supported, if they shared the PDTCH, the modulation of data coding will use GMSK to transfer data, that means the subscriber with 8-PSK will change its modulation to GMSK, so the throughput of the subscriber with 8-PSK will be decreased. The configuration is just as below. Figure: the subscribers of both GPRS and EGPRS will share the PDTCH to transfer data. Because the PS Service Preference Property is set to No Preference, the subscribers of both GPRS and EGPRS will share the PDTCH to transmit data, the modulation will use GMSK to code data, the throughput will be lower. So we must change the configuration to support GPRS and EGPRS subscribers separately, the subscribers to occupy the different PDTCH, just like below two figurations. Copyright, 2009 ZTE Corporation.
  • 21. Figure: the subscribers of EGPRS occupy the PDTCH with EDGE Dedicated Property. Above figuration indicates the subscribers of EGPRS will occupy the PDTCH with EDGE Dedicated Property. If the C/I is enough better to support the 8-PSK coding, the coding set of data transfer will use MCS-5 to MCS-9, so the throughput will be increased. In order to support the GPRS subscribers, we will configure the GPRS preference PDTCH to it, just like below figuration. Figure: the subscribers of GPRS occupy the PDTCH with GPRS Preference Property. So there have 3 PDTCH to support data transfer, the 2 PDTCHs are with EDGE dedicated and 1 PDTCH is with GPRS preference property in one sector. Copyright, 2009 ZTE Corporation.
  • 22. 14. The Throughput Improved for 3 PDTCHs After adjust above parameters and reconfiguration, the Mean Rate of EGPRS LLC DownLink Throughput of summarization from 7:00 to 24:00 by Cell is improved as below. Mean Rate of EGPRS LLC DL throughput(kbps)BSC9 10000 35000 60000 85000 110000 135000 160000 185000 210000 10-Jun11-Jun12-Jun13-Jun14-Jun15-Jun16-Jun17-Jun18-Jun19-Jun20-Jun Mean Rate of EGPRS LLC DL throughput(kbps) 137102133549136841143349143093120059168660175706161752200255 2010- 6-10 2010- 6-11 2010- 6-12 2010- 6-13 2010- 6-14 2010- 6-16 2010- 6-17 2010- 6-18 2010- 6-19 2010- 6-20 Figure: BSC9 of Mean Rate of EGPRS LLC Downlink Throughput improved. Copyright, 2009 ZTE Corporation.
  • 23. Mean Rate of EGPRS LLC DL throughput(kbps)BSC7 150000 155000 160000 165000 170000 175000 180000 185000 190000 195000 200000 10-Jun 11-Jun 12-Jun 13-Jun 14-Jun 15-Jun 16-Jun 17-Jun 18-Jun 19-Jun 20-Jun Mean Rate of EGPRS LLC DL throughput(kbps) 181297 185345 178324 185145 180824 147880 187513 196694 192351 197421 2010- 6-10 2010- 6-11 2010- 6-12 2010- 6-13 2010- 6-14 2010- 6-16 2010- 6-17 2010- 6-18 2010- 6-19 2010- 6-20 Figure: BSC7 of Mean Rate of EGPRS LLC Downlink Throughput improved. 15. The PDTCH Configuration(Cell Level) changed for 2 PDTCHs Before we have added one more PDTCH to support data with GPRS preference property in one sector, so one TCH is decreased to support voice call in one sector. In order to avoid the customer have complaint for the TCH decreased, we have changed one PDTCH with EDGE dedicated channel to TCH channel. So in one sector there has only 2 PDTCH support data transfer, the configurations are as below. Before changing, in one sector there have 2 PDTCH support EDGE mobile and 1 PDTCH support GPRS mobile. Copyright, 2009 ZTE Corporation.
  • 24. Figure: in one sector there have 2 PDTCH support EGDE mobile and 1PDTCH support GPRS mobile. After changing, in one sector there have only 1 PDTCH support EDGE mobile and 1 PDTCH support GPRS mobile. Copyright, 2009 ZTE Corporation.
  • 25. Figure: in one sector there have only 1 PDTCH support EGDE mobile and 1PDTCH support GPRS mobile. 16. The Throughput Improved for 2 PDTCHs After changing from 3 PDTCH channels to 2 PDTCH channels in one sector, the Mean Rate of EGPRS LLC DownLink Throughput of summarization from 7:00 to 24:00 by Cell is same as below. Copyright, 2009 ZTE Corporation.
  • 26. Mean Rate of EGPRS LLC DL throughput(kbps)BSC9 100000 110000 120000 130000 140000 150000 160000 170000 180000 190000 200000 210000 10-Jun 11-Jun 12-Jun 13-Jun 14-Jun 15-Jun 16-Jun 17-Jun 18-Jun 19-Jun 20-Jun 21-Jun 22-Jun 23-Jun 24-Jun 25-Jun Mean Rate of EGPRS LLC DL throughput(kbps) 137102 133549 136841 143349 143093 120059 168660 175706 161752 200255 167678 166143 160242 161366 162500 2010- 6- 10 2010- 6- 11 2010- 6- 12 2010- 6- 13 2010- 6- 14 2010- 6- 16 2010- 6- 17 2010- 6- 18 2010- 6- 19 2010- 6- 20 2010- 6- 21 2010- 6- 22 2010- 6- 23 2010- 6- 24 2010- 6- 25 Figure: BSC9 of Mean Rate of EGPRS LLC Downlink Throughput. Mean Rate of EGPRS LLC DL throughput(kbps)B8 165000 170000 175000 180000 185000 190000 195000 200000 205000 210000 11-Jun 12-Jun 13-Jun 14-Jun 15-Jun 16-Jun 17-Jun 18-Jun 19-Jun 20-Jun 21-Jun 22-Jun 23-Jun 24-Jun 25-Jun Mean Rate of EGPRS LLC DL throughput(kbps) 181954188208181190194658193982189402199302187748199171199804204267204806195568196447 10- 6- 11 10- 6- 12 10- 6- 13 10- 6- 14 10- 6- 16 10- 6- 17 10- 6- 18 10- 6- 19 10- 6- 20 10- 6- 21 10- 6- 22 10- 6- 23 10- 6- 24 10-6- 25 Figure: BSC8 of Mean Rate of EGPRS LLC Downlink Throughput. Mean Rate of EGPRS LLC DL throughput(kbps)BSC7 150000 155000 160000 165000 170000 175000 180000 185000 190000 195000 200000 10-Jun 11-Jun 12-Jun 13-Jun 14-Jun 15-Jun 16-Jun 17-Jun 18-Jun 19-Jun 20-Jun 21-Jun 22-Jun 23-Jun 24-Jun 25-Jun Mean Rate of EGPRS LLC DL throughput( kbps) 181297185345178324185145180824147880187513196694192351197421188743189510182875189102197509 2010- 6- 10 2010- 6- 11 2010- 6- 12 2010- 6- 13 2010- 6- 14 2010- 6- 16 2010- 6- 17 2010- 6- 18 2010- 6- 19 2010- 6- 20 2010- 6- 21 2010- 6- 22 2010- 6- 23 2010- 6- 24 2010- 6- 25 Figure: BSC7 of Mean Rate of EGPRS LLC Downlink Throughput. Copyright, 2009 ZTE Corporation.
  • 27. Mean Rate of EGPRS LLC DL throughput(kbps)BSC6 150000 170000 190000 210000 230000 250000 270000 18-Jun 19-Jun 20-Jun 21-Jun 22-Jun 23-Jun 24-Jun 25-Jun Mean Rate of EGPRS LLC DL throughput(kbps) 190840. 77 239575. 66 257611. 73 251368. 63 246125. 03 244249. 74 236479. 53 244116. 71 2010- 6- 18 2010- 6- 19 2010- 6- 20 2010- 6- 21 2010- 6- 22 2010- 6- 23 2010- 6- 24 2010- 6- 25 Figure: BSC6 of Mean Rate of EGPRS LLC Downlink Throughput. 17. Test Conclusion of EGPRS Download Throughput After changing above parameters and balance the DSP configuration, we have got best download throughput. Copyright, 2009 ZTE Corporation.
  • 28. Copyright, 2009 ZTE Corporation.

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