Wcdma Radio Network Planning And Optimization

WCDMA Radio Network Planning and Optimization Song Pengpeng

Contents ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WCDMA Fundamentals ,[object Object],[object Object],[object Object],[object Object]

WCDMA Fundamentals ,[object Object]

WCDMA Fundamentals ,[object Object],WCDMA parameters

WCDMA Radio Network Planning---Example of link budget analysis ,[object Object]

WCDMA Radio Network Planning---Example of link budget analysis Example of RLB for 12.2 kbps voice service(uplink,120km/h,in-car users,VA channel with soft handover) (*) *“modeling the impact of the fast power control on the WCDMA uplink”, sipila,K., Laiho-Steffens,J.,Jasberg,M. and Wacker.A, Proc VTC99’ Spring Huston,Texas,May 1999 pp.1266-1270

RADIO RESOURCE UTILIZATION To adjust the transmit powers in upilnk and downlink to the minimum level required to enshure the demanded QoS Takes care that a connected user is handed over from one cell to another as he moves through the coverage area of a mobile network. Let users set up or reconfigure a radio access bearer(RAB) only if these would not overload the system and if the necessary resources are available. Takes care that a system temporarily going into overload is returned to a non-overloaded situation. To handle all non-realtime traffic,allocate optimum bit rates and schedule transmission of the packet data, keeping the required QoS in terms of throughput and delays. To control the physical and logical radio resources under one RNC;to coordinate the usage of the available hardware resouces and to manage the code tree. ,[object Object],[object Object],[object Object],[object Object],[object Object],To ensure that the network stays within the planned condition

RADIO RESOURCE UTILIZATION---power control(1) ,[object Object]

RADIO RESOURCE UTILIZATION---power control(2) ,[object Object]

RADIO RESOURCE UTILIZATION---handover control ,[object Object],Event 1A: A P-CPICH enters the reporting range Event 1B: A P-CPICH leaves the reporting range Event 1C: A non-active PCPICH becomes better than an active one Event 1D: change of best cell. Reporting event is triggered when any P-CPICH in the reporting range becomes better than the current bet one plus an optional hysteresis value. Event 1E: A P-CPICH becomes better than an absolute threshold plus an optional hysteresis value. Event 1F: A P-CPICH becomes worse than an absolute threshold minus an optional hysteresis value. Addition window drop window

RADIO RESOURCE UTILIZATION---PC and SHO conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object]

RADIO RESOURCE UTILIZATION---congestion control ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RADIO RESOURCE UTILIZATION---congestion control (cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RADIO RESOURCE UTILIZATION---congestion control (cont’d) ,[object Object],[object Object],[object Object]

RADIO RESOURCE UTILIZATION---Code Planning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

RRM optimization --- SHO optimization(1) ,[object Object],[object Object],[object Object]

RRM optimization --- SHO optimization(2) ,[object Object],[object Object],Frequent and delayed Hos (cells ping-pong in the active set)

RRM optimization --- SHO optimization(3) ,[object Object],[object Object],[object Object],[object Object]

RRM optimization --- SHO optimization(4) ,[object Object]

RADIO RESOURCE UTILIZATION --- SHO optimization conclusion ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Coverage and Capacity issues ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Coverage and Capacity issues---Coverage ,[object Object],[object Object],[object Object],Hint: It’s critical to decide whether a specific area should be planned for high data rate service coverage or not

Coverage and Capacity issues---Capacity ,[object Object],[object Object],[object Object]

Coverage and Capacity issues---Enhancement methods ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Coverage and Capacity issues---Enhancement methods(cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Coverage and Capacity issues---Enhancement methods(cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Coverage and Capacity issues---Enhancement methods(cont’d) ,[object Object],[object Object],[object Object],[object Object],[object Object],for typical Micro- cell deployment for typical macro-cell deployment

CELL DEPLOYMENT ,[object Object],[object Object],[object Object],[object Object],[object Object],An “umbrella” macro cell is best suited for high-mobility users Micro layer provides a very high capacity in a limited area Capacity enhancement

CELL DEPLOYMENT ,[object Object],Reusing a micro carrier on all macro-cells does not bring any improvements in network performance! Reusing a macro carrier on all micro-cells can support 10% more users than the reference scenario,but extra Power Amplifier needed! Micro-cells do not benefit from the other carrier reused from macro-cells if they still have unused capacity on their own carrier! macro carrier reuse is not worth while when micro-cells locates near macro-cells!

WCDMA Radio Network Planning ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WCDMA Radio Network Planning---Network planning process overview Definition Planning and Implementation O&M

WCDMA Radio Network Planning ---Dimensioning(1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WCDMA Radio Network Planning ---Dimensioning(2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],* “Microwave Mobile Communications”, Jakes,W.C, John Wiley& Sons, 1974,126pp

WCDMA Radio Network Planning ---Dimensioning(3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WCDMA Radio Network Planning ---Dimensioning(4) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WCDMA Radio Network Planning ---Detailed Planning(1) ,[object Object],[object Object],[object Object],[object Object],[object Object],* “Static simulator for studying WCDMA radio network planning issues”,Wacker.A, Laiho-steffens.J,Sipila.K and Jasberg.M,VTC99’Spring pp2436-2440

WCDMA Radio Network Planning ---Detailed Planning(2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Site location,site ground height number of cells and antenna direction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],A WCDMA cell template may include cell layer type,channel model,Tx/Rx diversity options,power settings, maximum acceptable load, propagation model,antenna infomation and cable losses ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WCDMA Radio Network Planning ---Detailed Planning(3)---UL/DL iteration steps UL iteration steps DL iteration steps

WCDMA Radio Network Planning ---Adjacent Channel Interference ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],UL adjacent channel interference situation

WCDMA Radio Network Planning ---Adjacent Channel Interference ,[object Object],[object Object],[object Object],[object Object],[object Object],DL adjacent channel interference situation

WCDMA Radio Network Planning ---Example of Worst ACI case ,[object Object],Assuming ACS and ACLR of values 33dB and 45dB respectively, the coupling C between the carriers can be calculated as: This simple example shows that clearly in these cases the DL is the weaker link, i.e. before coming too close to a micro BS, the connection of a macro BS will be dropped due to insufficient DL power and it cannot block the micro BS. For uplink scenario, with a maximum MS power of 21dBm, 53dB for MCL to the micro BS and coupoing between the carriers of C=32.7dB,the received level at the micro BS and be estimated as if the background noise level is dBm, the micro BS would suffer a 38.4 dB noise rise form one macro user, which is located in the radio sense at the MCL distance form the micro BS, i.e. such a macro user would completely block the micro BS. For downlink scenario, supposing the micro BS is transmitting with a minimum power of 0.5W(27dBm); then the received interference at the MS in the adjacent channel is Assuming speech service (processing gain of Gp=25dB) with an Eb/No requirement at the Ms of 5dB and an allowed noise rise in the macro cell of 6 dB, the maximum allowed propagation loss Lp to keep the uplink connection working is if we further consider a DL Tx Eb/No requirement of 8dB, the transmit power would need to be

WCDMA Radio Network Planning ---Optimization aspects(1) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

WCDMA Radio Network Planning ---Optimization aspects(2) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],* “The impact of the base station sectorisation on WCDMA Radio Network Performance”,A.Wacker,J.Laiho-Steffens,K.Sipila,K.Heiska,VTC99’Amsterdam. ** “The impact of the Radio Network Planning and Site Configuration on the WCDMA Network Capacity and Quality of Service”,J.Laiho-Steffens,A.Wacker, P.Aikio,VTC2000

[object Object],WCDMA-GSM Co-Planning Issues

WCDMA-GSM Co-Planning Issues---interference issues ,[object Object],[object Object],[object Object],[object Object],Second-order harmonic distortion from GSM900 falling into WCDMA band

WCDMA-GSM Co-Planning Issues ---interference issues ,[object Object],[object Object],[object Object],[object Object],[object Object],XMD is proportional to the square of transmitting power and very sensitive to the Tx power of the MS! Typically in micro-cells and could be reduced by guard band. Third-order IMD with mixture of products of the GSM carrier frequencies f1 and f2: 2f1-f2 or 2f2-f1

WCDMA-GSM Co-Planning Issues Handover GSM  WCDMA for capacity extension or service optimization Handover WCDMA-GSM for coverage extension Antenna sharing and co-located sites could be preferable.

Co-existing TDD & FDD modes ---UTRA TDD mode ,[object Object],Rather low spreading factors makes it inadequate to reuse all the timeslots in all the cells.That is,network must control which slots and directions are used in which cells. Not as fast as to follow fast fading pattern!

Co-existing TDD & FDD modes---Example of TDD RLB uplink/downlink Greater Eb/No difference between with or without RxD! Smaller Max path loss than that of FDD scenario  TDD cells have smaller radius!

Co-existing TDD & FDD modes--- TDD/TDD interference ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Co-existing TDD & FDD modes --- TDD/FDD interference ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Interference mainly between TDD and FDD/UL frequency bands!

Co-existing TDD & FDD modes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],From the service point of view, UTRA TDD is most suited for small cells and high data rate services!

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