WCDMA Radio Network Planning

Feb 2010 MTN Sudan Radio Planning and Optimization Dept

Page 1Presentation contentsIntroduction.What is WCDMA (technical background)?What are the services provided by the WCDMA?Radio planning process.

1\ IntroductionIn the previous time the communication services was mainly Focus on voice communication.Then the demand on data services came on and growth upGradually.Now the world be came an small village either you have theCapability to leave in or you have to leave out , and that where ever you are (in a big town, small village or leavingalone).

1\ IntroductionEvolution in term of data transfer

EULRelease 6

EDGE

GSMGPRSWCDMARelease 99

HSDPARelease 5

Downlink peak data rate (Typical deployment)Downlink peak data rate (Theoretical Maximum)GSM9.6 Kbps9.6 KbpsGPRS40 Kbps171 KbpsEDGE120 Kbps273 KbpsWCDMA Release 99384 Kbps2.0 MbpsHSDPA10.0 Mbps14.4 Mbps

2\ WCDMA (technical background)Wide band Code Division Mutable Access some times refer to itby Universal Mobile for Terrestrial System (UMTS) is based on Utilizing wide band (5 MHz carrier in FDD) as one carrier then all (Users, Channels, Cells ) have been identified by codes.

2\ WCDMA (technical background)The code is multiplied with user data in spreading stage asIn the above figure then data excluded again in the receiverIn Dispreading stage by correlating the received code with reference one .

3\ WCDMA Services3-1 Release 99: - Each user is assigned a unique code dependent on the required data rate. - Maximum implemented downlink of 384kbps. - AMR 12.2 voice service is supported. - Closed loop power control & Soft handover are Supported. - QPSK Modulation technique is used. - Code limitation for high data rate users.

3\ WCDMA Services3-2 High Speed Downlink Packet Access (HSDPA): - Higher data rates can reach up to 10 Mbps. - Each user may be assigned all or part of the resource every 2 ms (Frame Period). - Multiple codes allocated per user. - Adaptive modulation (QPSK and16QAM) and coding. - Fixed power with link adaptation. - Soft Handover not supported.

3\ WCDMA ServicesAdaptive modulation and coding VS Throughput

ModulationCoding RateThroughput with 5 codesThroughput with 10 codesThroughput with 15 codesQPSK 1/4600 Kbps1.2 Mbps1.8 Mbps 2/41.2 Mbps2.4 Mbps4.8 Mbps 3/41.8 Mbps3.6 Mbps5.4 Mbps16QAM 2/42.4 Mbps4.8 Mbps7.2 Mbps 3/43.6 Mbps7.2 Mbps10.7 Mbps 4/44.8 Mbps9.6 Mbps14.4 Mbps

4\ Network Architecture

4\ Radio Planning Process- Above figure illustrate the main elements of the UMTS network.- In the radio planning mainly we focus on Uu interface ( Site Coverage and capacity ) although all element and interfaces Have to be considered.- The radio planning divided into two parts: 1\ Coverage Plan. to identify the cell coverage (Radius) then the required number of NodeBes (RBSs). 2\ Capacity plan. to grantee enough resources for the available users.

4\ Radio Planning Process

4\ Radio Planning Process4-1 Coverage Plan:

4\ Radio Planning Process- Mainly the link budget and propagation module identify the cell Radius.- Element in the link budget like (Penetration loss, Fading margin And interference margin) have less values in Rural areas what Make the cell radius larger than in urban.- The Propagation model depend on the clutter type what also Affect the cell radius.

*

*The design will be divided into two parts for the two different clutters individually .1- in the East part (Urban clutter).The link budget is as follow.

Maximum allowable loss= NodeB Transmission Power + NodeB Antenna Gain - Cable Loss - Penetration Loss - Body Loss + UE Antenna Gain (dB)+SHO Gain -SHO Gain -Interference Margin -UE Reception Sensitvity

PL=36+18-3-16-3+0+3-3-5-6-(-104) = 125 dB

R=10

=(PL-61-20 log f)/20PL=125F=2110 MHzR =0.79km=800m

Area=3/2 3 R =1.7 KmNumber of Sites = 40/1.7=24 Sites

Link budget ElementValueNodeB Transmission Power (dB)36NodeB Antenna Gain (dBi)18Cable Loss (dB)3Penetration Loss (dB)16Body Loss (dB)3UE Antenna Gain (dB)0SHO Gain (dB)3Slow Fading Margin (dB)3Fast fading Margin (dB)5Interference Margin (dB)6UE Reception Sensitvity (dB)-104

*1- in the West part (Urban clutter).The link budget is as follow.

Maximum allowable loss= NodeB Transmission Power + NodeB Antenna Gain - Cable Loss - Penetration Loss - Body Loss + UE Antenna Gain (dB)+SHO Gain -SHO Gain -Interference Margin -UE Reception Sensitvity

PL=36+18-3-15-3+0+3-3-5-4-(-104) = 128 dBNote : Penetration Loss & Interference Margin are less

R=10

=(PL-61-20 log f)/20PL=128F=2110 MHzR =1.1km=1100m

Area=3/2 3 R =3.14 KmNumber of Sites = 55/3.14=17.5 = 18 Sites

Link budget ElementValueNodeB Transmission Power (dB)36NodeB Antenna Gain (dBi)18Cable Loss (dB)3Penetration Loss (dB)15Body Loss (dB)3UE Antenna Gain (dB)0SHO Gain (dB)3Slow Fading Margin (dB)3Fast fading Margin (dB)5Interference Margin (dB)4UE Reception Sensitvity (dB)-104

4\ Radio Planning Process4-2 Capacity Plan:- In WCDMA the capacity is closely related to coverage because the power is share (the higher capacity the smaller cell radius).- The dimensioning based on: 1- Traffic Model. 2- Interference Analysis & Capacity Dimensioning.4- Iub Dimensioning.

4\ Radio Planning Process

Traffic Model.1- The number of users in the East side are 36000 users. The number of users in the west side are 27000 users.2- The clutter type in the East side is Urban. The clutter type in the west side is Sub urban or semi rural.3- for Traffic module Check the documents (capacity plan) page 53.4- calculate the load in UL and DL as in documents (capacity plan) page 54 & 55 and check the load is it ok ornot.

4\ Radio Planning Process4-2-2 Interference Analysis & Capacity Dimensioning.

MTN Sudan 2010**MTN Sudan 2010MTN Sudan 2010**MTN Sudan 2010MTN Sudan 2010*MTN Sudan 2010