lte planning
Post on 16-Jul-2015
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LTE Planning Prepared By: RF Team
AbdelRahman Fady & Mohamed Mohsen
LTE Planning Procedures
• Planning process is a very vital process we should do it carefully to get good network performance
• LTE Planning Process consists of three main steps as below
• Preplanning • Information Gathering • Dimensioning
• Detailed planning • Prediction & Simulation • TSS • Code Planning • Neighbors Planning • Parameters planning
• Acceptance • SSV • KPIs
Information gathering • Dimensioning Procedures should follow information gathering job about the nature of the
subscriber and the area • We can divide the gathered information into the following
• Design Information • Required BLER • Minimum RSRP • Limited MCS • ……. etc.
• Inventory information • Number of GSM/UMTS sites • Type of antennas • MIMO existence • TMA existence • …. etc.
• RF features • Scheduler type • …… etc.
• Subscriber information • Mixed services Traffic Model • Users behaviors • ….etc.
• Coverage information • Clutter type • ….etc.
LTE Dimensioning Concept
Dimensioning Procedures should follow information gathering job about the nature of the subscriber and the area
Dimensioning could be divided into two main steps as following
• Capacity dimensioning • Coverage dimensioning
Both capacity and coverage dimensioning process should be balanced
Coverage Dimensioning
Capacity Dimensioning
Gathered Info.
• Cell radius (R) • Inter site distance (I) • Number of sites (N) • Main design info
LTE Dimensioning Concept
Dimensioning Procedures should follow information gathering job about the nature of the subscriber and the area
Dimensioning could be divided into two main steps as following
• Capacity dimensioning • Coverage dimensioning
Both capacity and coverage dimensioning process should be balanced
N = Total Area / Site Area (A)
A = 1.94 * R^2 … directional antenna or
A = 2.5 * R^2 … omni antenna
D = 1.5 * R
LTE Dimensioning Concept
Coverage Dimensioning
Capacity Dimensioning
Modify
Get ( R )
Get ( N & D )
Coverage dimensioning
• Coverage Dimensioning Steps
Coverage Dimensioning
Uplink Link budget
Downlink Link Budget
Get (MAPL) Limited one
Get ( R ) , Get ( D ) and Get ( N)
Subs. In Propagation Model equation
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Coverage : considering the uplink is the limitation we will start with it.
• Bit rate requirement
• SINR requirement
a0, a1, a2 and a3 are fitted parameters and the SINR is expressed in dB. The semi-empirical parameter a0 represents the maximum obtainable bit rate in one resource block.
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Coverage • SINR requirement
DL Fitted parameters
UL Fitted parameters
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Coverage • Bit rate requirement
• SINR requirement
• eNodeB Receiver sensitivity
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Coverage • Bit rate requirement
• SINR requirement
• eNodeB Receiver sensitivity
• Noise rise calculation
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Coverage • Bit rate requirement
• SINR requirement
• eNodeB Receiver sensitivity
• Noise rise calculation
• UE power per RB
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Link Budget MAPL_Uplink = Pue,rb – eNB_senstivity – penetration loss – body loss – FFM – Noise_rise - LNF_margine – AS_losses + Ant_gain + another Gains
Log Normal fading
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Link Budget MAPL_Uplink = Pue,rb – eNB_senstivity – penetration loss – body loss – FFM – Noise_rise - LNF_margine – AS_losses + Ant_gain + another Gains
Building penetration Losses
Coverage dimensioning
• Coverage Dimensioning Steps
• Uplink Link Budget MAPL_Uplink = Pue,rb – eNB_senstivity – penetration loss – body loss – FFM – Noise_rise - LNF_margine – AS_losses + Ant_gain + another Gains
• Car_losses is typically 7 to 8 dB
• Fast Fading margine is typically from 0 to 2 dB
• Body Loss is typically 0 to 5 dB
• AS_losses = Feeder_Loss + Jumber_Loss + connector_losses
• Ant_Gain is typically 18 dB
• Another system gain like MIMO gain or TMA gain
Coverage dimensioning
• Coverage Dimensioning Steps
• Downlink Link Budget MAPL_Downlink = P_RB – LTE-Ue_senstivity – penetration_loss – Car_Losses – IM - body loss – FFM – LNF_margine – AS_losses + Ant_gain + another system Gains
• P_RB = HPA_Power / Nrb
• Nrb is the number of RB per carrier as explained before
• LTE-Ue_senstivity = Nt + Nf + 10 log (Nrb” * 180KHZ) + SINR
• Nrb” is number of RBs assigned for single subscriber @
cell edge. It should depend on the required throughput at
cell edge.
Coverage dimensioning
• Coverage Dimensioning Steps
• Downlink Link Budget MAPL_Downlink = P_RB – LTE-Ue_senstivity – penetration_loss – Car_Losses – IM - body loss – FFM – LNF_margine – AS_losses + Ant_gain + another system Gains
• How to get SINR_DL….?
Coverage dimensioning
• Coverage Dimensioning Steps
• Downlink Link Budget MAPL_Downlink = P_RB – LTE-Ue_senstivity – penetration_loss – Car_Losses – IM - body loss – FFM – LNF_margine – AS_losses + Ant_gain + another system Gains
• How to get SINR_DL….?
Coverage dimensioning
• Coverage Dimensioning Steps
• Downlink Link Budget MAPL_Downlink = P_RB – LTE-Ue_senstivity – penetration_loss – Car_Losses – IM - body loss – FFM – LNF_margine – AS_losses + Ant_gain + another system Gains
• Interference Margin
• Due to using RP = 1 in LTE
@ cell edge we have to
expect level of interference
this level of interference
should be varies with cell
load hence we have to
consider this level of
interference during our
calculations of MAPL
Coverage dimensioning
• Coverage Dimensioning Steps
• Downlink Link Budget MAPL_Downlink = P_RB – LTE-Ue_senstivity – penetration_loss – Car_Losses – IM - body loss – FFM – LNF_margine – AS_losses + Ant_gain + another system Gains
Log Normal fading
Coverage dimensioning
• Coverage Dimensioning Steps
• Downlink Link Budget MAPL_Downlink = P_RB – LTE-Ue_senstivity – penetration_loss – Car_Losses – IM - body loss – FFM – LNF_margine – AS_losses + Ant_gain + another system Gains
Building penetration Losses
Coverage dimensioning
• Coverage Dimensioning Steps
• Downlink Link Budget MAPL_Downlink = P_RB – LTE-Ue_senstivity – penetration_loss – Car_Losses – IM - body loss – FFM – LNF_margine – AS_losses + Ant_gain + another system Gains
• Car_losses is typically 7 to 8 dB
• Fast Fading margine is typically from 0 to 2 dB
• Body Loss is typically 0 to 5 dB
• AS_losses = Feeder_Loss + Jumber_Loss + connector_losses
+ TMA insertion Loss
• Ant_Gain is typically 18 dB
• Another system gain like MIMO gain or Scheduler gain
Coverage dimensioning
• Get limited MAPL then substitute in propagation model equation to get R
• Radius calculation ( R )
Capacity Dimensioning
• Target of capacity dimensioning is to get the number of cells / sites we do need to accommodate the offered traffic.
N = Total Number of users / Number of users per site (Nuser) Nuser = No# cells / site * Number of users per cell (Ncell) Ncell = Traffic per cell / traffic per user
Capacity Dimensioning
Get ( N )
Capacity Dimensioning
• Target of capacity dimensioning is to get the number of cells / sites we do need to accommodate the offered traffic.
Capacity Dimensioning
Uplink Number of sites
Downlink Number of Sites
Get (N) Limited one
Balance to Get final ( R, D & N)
Back with New (N) to Coverage
Capacity Dimensioning
• Cell Capacity Calculation • Cell Capacity calculation
• TCell = Tmax * Q • Where
• Tmax is the maximum cell throughput • Q is the maximum cell loading factor
• Tmax = (((Number of bits / symbol) * 144)/ 1 msec ) * Nrb * MIMO_order * (1-
CCH_ratio)
• Where • Number of bits / symbol = Modulation order * Code rate • Nrb is the total number of resource block per carrier • CCH_ratio is the ratio of control channels • MIMO_order is the degree of MIMO
Capacity Dimensioning
• Cell Capacity Calculation • User capacity calculation
BLERRatioDutySessionTimeSessionbearRatekbitsfficSessionTra
1
1)(
] )*[()(/ ii nRatePenetratiofficSessionTraBHSAkbpsuserroughputBusyHourTh
Bearer Rate: Required Rate for the service
Session Time: PPP Session Time
Session Duty Ration: what is the percentage of active
transmission per session
BLER: Block Error Rate
BHSA: Busy Hour Session Attempts
Penetration Rate: percentage of service user
Capacity Dimensioning
Traffic Modeling
Mean Bit Rate (Kbps) PPP Session
Time (s)
PPP Session
Duty Ratio BLER
Throughput Per
Session (Kbit)
UL DL UL DL UL DL UL DL UL DL
VoIP 32 32 210 210 0.4 0.4 1% 1% 2715.15 2715.15
Video Phone 64 64 54 54 1 1 1% 1% 3490.91 3490.91
Video
conference 128 192 1800 1800 1 1 1% 1% 232727 349091
Interactive
Gaming 50 64 1800 1800 0.2 0.4 1% 1% 18181.8 46545.5
Streaming
Media 10 300 3600 3600 0.05 0.95 1% 1% 1818.18 1036364
Instant
Messaging 20 20 7 7 0.2 0.2 1% 1% 28.2828 28.2828
Web Browsing 8 256 1800 1800 0.05 0.05 1% 1% 727.273 23272.7
Email 256 256 300 300 1 1 1% 1% 77575.8 77575.8
Thank You
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