EGPRS AND GPRS PRELIMINARY DIMENSIONING GUIDELINE R9.1
【名称】：EGPRS AND GPRS PRELIMINARY DIMENSIONING GUIDELINE R9.1【作者】：john
【格式】：pdf
【页数】：23
【语言】：中文(默认)
【摘要或目录】：（必填）
EGPRS AND GPRS PRELIMINARY DIMENSIONING GUIDELINE R9.1
SERVICE DELIVERY GUIDELINE
Table of contents
1 INTRODUCTION..........................................................................2
2 INPUT REQUIREMENTS............................................................2
3 DIMENSIONING...........................................................................3
3.1 PROCEDURE..................................................................................3
3.2 EXAMPLES........................................................................................9
4 REFERENCES.............................................................................11
5 GRAPHS.......................................................................................11
1 INTRODUCTION
This is a preliminary document intended to provide a rough method for EGPRS and GPRS dimensioning with respect to application throughput and end-to-end performance. It should only be used if necessary, and very cautiously. The error margin is very big and can not be estimated.
2 Input requirements
The following inputs are necessary for the dimensioning:
− Voice, GPRS and EGPRS coverage objectives.
− Circuit switched traffic and grade of service requirements.
− Volume and throughput requirements for GPRS and EGPRS data traffic.
− Mobile multislot class. The dimensioning of EGPRS/GPRS is dependent on how many timeslots the MS can use. The method assumes that all mobiles can use the same multislot class.
2(23
© Ericsson. Ericsson Wide Internal
) GG/N-02:0254 Rev pA7
SERVICE DELIVERY GUIDELINE
3 DIMENSIONING
The objective is to dimension the packet data network so that with a certain load on each channel (kbps/pdch) a median required throughput (kbps) can be achieved for EGPRS and GPRS.
The dimensioning does not only depend on the number of available PDCHs, but also on the channel capabilities and fractions of EGPRS and GPRS traffic respectively. It assumes an average static traffic distribution that in reality will fluctuate.
3.1 PROCEDURE
This procedure can be followed for both EGPRS and GPRS dimensioning.
1. Make a Channel Loading Plan for voice.
2. Calculate the load of EGPRS and GPRS traffic respectively per cell. (EGPRS_load and GPRS_load)
3. Estimate the number of available PDCHs from the voice channel dimensioning, (#PDCHs). The number of PDCHs is the total number of timeslots minus those required for CS-traffic. For example, if there are two TRUs with 16 timeslots and 1 timeslot is used for BCCH, 1 timeslot for SDCCH and 8 timeslots (in average) for TCH, there will be 16-1-1-8 = 6 PDCHs. Additional TRUs can be added to get more PDCHs.
For a quick and simple calculation giving a first estimation, please use step 4 below. For a more advanced solution, please select step 5.
4. The numbers of EGPRS and GPRS time slots depend on the load on each of them. Estimate how many EGPRS and GPRS timeslots that are needed, (EGPRS_time_slots and GPRS_time_slots) using these formulas: loadEGPRSloadGPRSPDCHsslotstimeEGPRS__31#__⋅+=
slotstimeEGPRSPDCHsslotstimeGPRS__#__−=
With these formulas it can be assumed that the EGPRS traffic will use the EGPRS_time_slots, and the GPRS traffic will use the GPRS_time_slots. Please proceed to step 6.
5. This step is quite complicated. If we assume that the number of EGPRS_time_slots, GPRS_time_slots, EGPRS_load and GPRS_load are already known or estimated, and that the traffic is high, we might get a case where some GPRS traffic use the EGPRS_time_slots and vice versa. 谢谢分享。
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