owp112010 wcdma radio network coverage dimensioning issue1.21

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WCDMA radio network coverage

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  • WCDMA Radio Network Coverage Planning

    Confidential Information of Huawei. No Spreading Without Permission

    N-0

  • WCDMA Radio Network Coverage Planning

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  • WCDMA Radio Network Coverage Planning

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  • WCDMA Radio Network Coverage Planning

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    Capacitycoverage (typical case: downlink load balance)

    Capacityquality (typical case: lowering BLER through outer loop power control)

    Coveragequality (typical case: lowering the data rate of the connections with much path

    loss through AMRC)

  • WCDMA Radio Network Coverage Planning

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    3G radio network planning can be divided into three phases. They are shown in above

    figure, and consist of dimensioning, pre-planning and cell planning.

    According to the above figure, the output result of radio network dimensioning stage

    serves as the input condition of the pre-planning, and the pre-planning is based on the

    network dimensioning and also checks the network dimensioning result. The site quantity

    can be adjusted according to the pre-planning result in order to obtain the reasonable sites.

    If the existing sites are considered in the selection of theoretical sites during the pre-

    planning, the pre-planning result will be more practical, thus facilitating the cell planning.

  • WCDMA Radio Network Coverage Planning

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    Radio Network Dimensioning is a simplified analysis for radio network

    Dimensioning provides the first and most rapid evaluation of the network element number

    as well as the associated capacity of those elements. The target of dimensioning phase is

    to estimate the required site density and site configurations for the area of interest.

    Dimensioning activities include radio link budget and coverage analysis, capacity evaluation

    and final estimation of the amount of NodeB hardware and E1, cell average throughput

    and cell edge throughput.

    Objective:

    To obtain the network scale ( approximate NodeB number and configuration)

    Method:

    Select a proper propagation model, traffic model and subscriber distribution, and

    then estimate the NodeB number, coverage radius, E1 number per site, cell

    throughput, cell edge throughput and so on.

  • WCDMA Radio Network Coverage Planning

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    The service distribution, traffic density, traffic growth estimates and QoS requirements are

    already essential elements in dimensioning phase. Quality is taken into account here in

    terms of blocking and coverage probability.

  • WCDMA Radio Network Coverage Planning

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    Wireless network dimensioning intends to obtain the approximate UTRAN scale. Based on

    the network dimensioning, geography and traffic distribution, the network is pre-planned

    in detail by using planning software and digital map.

    Based on the network dimensioning and site information, the initially selected WCDMA

    site is imported into the planning software, and coverage is estimated by parameters

    setting. Then an analysis is made to check whether the coverage of the system meet the

    requirements. If necessary, the height and tilt of the antenna and the NodeB quantity are

    adjusted to optimize the coverage. And then the system capacity is analyzed to check

    whether it meets the requirement.

    Implementation parameters, such as antenna type / azimuth / tilt / altitude / feeder type /

    length

    Cell parameters, such as transmission power of traffic channel and common channel,

    orthogonal factor, primary scrambling code

  • WCDMA Radio Network Coverage Planning

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    Based on the network dimensioning and site information, the initially selected WCDMA BS

    is imported into the planning software, and coverage is estimated by setting the cell

    parameters and engineering parameters. Then an analysis is made to check whether the

    coverage of the system meet the requirements. Then the system capacity is analyzed to

    check whether it meets the requirement. If necessary, the height and tilt angle of the

    antenna and the BS quality are adjusted to optimize the coverage.

  • WCDMA Radio Network Coverage Planning

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    These graphs are prediction results of Huawei planning tool: U-Net

    For the result of coverage prediction, focus on the distribution of best servers and pilot

    level. For the small areas with unqualified level, adjust the azimuth and down tilt to

    improve the coverage. For the large areas with weak coverage, analyze whether the site

    distance is over large:

    If yes, add sites to improve coverage.

    If no, check whether the configuration of parameters related to coverage

    prediction is correct.

  • WCDMA Radio Network Coverage Planning

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    We should consider other factors when we select the backup sites

    Commercial factor: rent

    Radio propagation factor: situation / height / surrounding /

    Implementation factor: space / antenna installation / transmission / power supply

  • WCDMA Radio Network Coverage Planning

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    Simulation is oriented to simulate the running situation of networks under the current

    network configuration so as to facilitate decision-making adjustment. Now there are two

    system simulation classes: static simulation and dynamic simulation.

    Static simulation focus on user behavior such as browsing Internet, call. It would gain the

    performance of radio network based on snapshot.

    Dynamic simulation focus on detail of user behavior such as duration and data rate of

    browsing. It would gain the performance of radio network based on analysis of mobile

    subscribers. But it requires higher precision of e-map.

    At present, Static simulation is in common use. Monte Carlo simulation is one type of

    static simulation.

  • WCDMA Radio Network Coverage Planning

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  • WCDMA Radio Network Coverage Planning

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    Some UEs or terminals are distributed based on a certain rule (such as random even

    distribution) at each snapshot

    It is required to consider the possibility of multiple connection failure (uplink/downlink

    traffic channel maximum transmit power, unavailable channels, low Ec/Io and

    uplink/downlink interference

  • WCDMA Radio Network Coverage Planning

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    N-14

    These graphs are prediction results (based on simulation) of Huawei planning tool: U-Net

    The previous predictions (Coverage by transmitter, Coverage by signal level, Overlapping

    zones) are based on coverage, the predictions in this slide are based on simulation.

  • WCDMA Radio Network Coverage Planning

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  • WCDMA Radio Network Coverage Planning

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  • WCDMA Radio Network Coverage Planning

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    In the coverage dimensioning, the link is estimated according to elements such as planned

    area, network capacity, and equipment performance in order to obtain the allowed

    maximum path loss. The maximum cell radius is obtained according to the radio

    propagation model and allowed maximum path loss. And then the site coverage area is

    calculated. Finally, the site quantity is calculated. Of course, the site quality is only for the

    ideal cell status, and some additional sites will be needed in actual terrain environment.

  • WCDMA Radio Network Coverage Planning

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  • WCDMA Radio Network Coverage Planning

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    Link dimensioning intends to estimate the system coverage by analyzing the factors of the

    propagation channels of the uplink signal and downlink signal. It is the link analysis model.

    If the parameters such as transmit signal power, gain and loss of the transmitter and

    receiver, and quality threshold of received signal are known or estimated, the allowed

    maximum path loss used for ensuring the quality of received signal can be calculated.

  • WCDMA Radio Network Coverage Planning

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