GPRS Radio Network Planning

GPRS Radio Network PlanningZTE university

After completing this course, you will be able to Know the principle of the GPRS network planningKnow how to make capacity planning and coverage planningKnow how to make GPRS frequency planning and GPRS parameter planningObjective

GPRS Network Planning OverviewGPRS Traffic DistributingGPRS Coverage PlanningGPRS Capacity PlanningGPRS Frequency PlanningGPRS Parameter PlanningCatalog

Main Planning PrincipleGPRS Network Planning OverviewMain Planning PrincipleBalance CS and PS traffic and make development togetherTake full use of the existing GSM resource.Keep the quality of GSM network, meet the need of GPRS traffic

Influence of GPRS trafficGPRS Network Planning OverviewNew interference from GPRSChange of the traffic mode and planningShort of traffic channelDistribution of the radio resource become more complicated.Signal load increasingInfluence of GPRS traffic

GPRS Planning ProceduresGPRS Network Planning OverviewCreate GPRS traffic modeGPRS coverage PlanningGPRS Capacity Planning

GPRS frequency PlanningGPRS parameter planning12345

GPRS traffic sort and applicationGPRS Traffic DistributingGPRS traffic sortUnconnected PTP service Connected PTP service PTMothersGPRS traffic applicationInformation on DemandSMS based on GPRSInertnet explorer and WAPE-mailFTP download and uploadE-tradeothers

Key point of GPRS traffic modeGPRS Traffic DistributingKey points of GPRS traffic mode Subscriber modeThe whole volume of GPRS trafficPercent of different trafficTraffic distributing by timeTraffic distributing by space Traffic modePackage length distribution of each trafficPackage interval distribution Radio transmission modeDistributing of coding schemeSignaling cost

GPRS traffic mode calculationGPRS Traffic DistributingOn the assumption thatthere is no SNDCP compression/decompression and segmentation/reassemblyone IP block is transferred as one LLC block on LLC layerOn the assumption that LLC is in Nack modeOn the assumption that LLC frame is made ofLLC header(9 bytes)SNDCP header(4 bytes)IP dataFCS(3 bytes)one RLC length indicator byte for each blockRLC in ack mode and 10% retransmit rate On the assumption that the average length of IP package is 200 bytes.On the assumption that IP data is continues for every 10 IP packages.M A1 / BT (M M0.2M0.1) 20 V_IP A2 / TV_Gb V_IP(20053) / 2001.265V_IPM is the min RLC blocks for the transmission of N LLC PDUA1 is the bytes number of N LLC PDUA2 is the bytes number of N IP packagesB is the bytes number of LLC PDU that one RLC block can bearT is the time for the transmission of N LLC PDUV_IP is assumed to be the bearing rate of IP layer for each PDCHVGb is assumed to be the bearing rate of GB for each PDCHXmeans round up (X) ,X means round down (X)

Bearing Rate of GPRS trafficGPRS Traffic Distributing

Allowable minimum C/I on different code schemeGPRS coverage planningRemark: BELER=10%

Throughput affected by C/I using different code schemeGPRS coverage planning

Procedure of GPRS coverage planningGPRS coverage planningLink budgetCalculate the maximum allowable pass loss of CS and PS (on certain code scheme) on certain assumptionCoverage radius calculatingAccording to the maximum allowable pass loss, calculate the coverage area both of CS and PS traffic.Coverage planningChoose the less one as the coverage area to meet the coverage requirement both of CS and PS traffic. The assumption of radio environment and transmission model is the same as CS traffic.

PS coverage contrasted with the CSGPRS coverage planning

GPRS Network Planning GPRS Traffic DistributingGPRS Coverage PlanningGPRS Capacity PlanningGPRS Frequency PlanningGPRS Parameter PlanningCatalog

Assumption of Compbell algorithmAssumption1On GPRS/EDGE channelsservice with different average bandwidth requirements at the same time are provided.Assumption2For each requestSessiondata is transferred with traffic equivalent bandwidth continuously.Assumption3The number of PDCH requested by MS is the minimum number which can meet the bandwidth requirement.GPRS capacity planning

Method of calculating the bearer bandwidth of channels on IP layerLLC efficiency=(signal flow+ data flow number of data package *4)/(signal flow + data flow+ GMM/SM messages number + number of packages *10)=LLC throughput * LLC efficiency * RLC efficiency *(1-RLC retransmission rate)CS-1:8kbpsCS-2:12kbpsCS-3:14.4kbpsCS-4:20kbps95%1%GPRS capacity planning

Compbell algorithmGPRS capacity planning

Procedure of GPRS signal channel planningCalculate the signal capacity according to the configration of existing networkIncreased load of signal channel by each WAP userIncreased load of signal channel by each internet userCalculate the increasement of total signal channel after introduction of GPRS trafficDetermine whether CCCH needs expansion based on the networkGet the number of WAP user and internet user from the result of capacity planningGPRS capacity planning

Examples of GPRS signal channel planningNote: The above result is got based on vast of data after WAP log-on; The number of paging that needs to be added shall also conclude paging resending in CS domain caused when GPRS users in PDP ACTIVE fail to monitor PCH during data transferring. GPRS Capacity Planning

GPRS frequency planning programme for initial networkIts suggested to set the PDCH on BCCH trx in initiate stage of GPRS development. Main advantages are: C/I can satisfy the requirement of GPRS coverage NO extra interference to GSM traffic Avoid the extra consideration of DTX, IUO, Hopping and PC etc.GPRS frequency planning

Important parameters in GPRS PlanningRACNSEIBVCISPCUMUNITBSICFREQCRHTEOCROGPRS Cell Reselection ParameterNMOT3168T3192DRX_TIMER_MAXBS_CV_MAXPAN_DECGPRS Cell ParameterPAN_INCPAN_MAXACCESS_CONTROL_CLASSMAX_RETRANSGPRS Cell Access ParameterT_AVG_WT_AVG_TGPRS PC ParameterULPWCTRLDLPWCTRLGPRS Cell IdentiferTX_INTAGMFRPTRXLEVACCESSMINPriorityDelay ClassReliabilty ClassGPRS SM ParameterPeak Throughput ClassMean Throughput ClassGPRS Parameter Planning

Documents

GPRS Radio Network Planning