oep100320 lte radio network capacity dimensioning issue1.01

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  • 8/13/2019 OEP100320 LTE Radio Network Capacity Dimensioning ISSUE1.01

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    Course Name

    Confidential Information of Huawei. No Spreading Without Permission

    P-1

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    Traffic model includes two factors

    Service Model: Analyze the data rate for each service type to determine theaverage throughput for single user

    User behavior: Analyze the user distribution to get the throughput of each TRx

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    Real Time Gaming: Low bit rate, real-time, high burst, asynchronous, asymmetric uplink

    and downlink traffic, and interactive.

    VoIP (Voice over IP) and video conference: The bit rate is between low bit speed and

    middle bit speed, real-time, synchronization, symmetric uplink and downlink traffic, and

    interactive.

    Streaming media: The bit rate is between low bit rate and middle bit rate, not in real time,

    low delay shaking, synchronization, asymmetric uplink and downlink traffic, non-interactive.

    IM and WWW network browsing (basic Internet application): The bit rate is between low

    bit rate and middle bit rate, no information loss, asymmetric, asynchronous uplink and

    downlink traffic, middle delay, and interactive. File transmission and media download: The bit rate is between low bit rate and middle bit

    rate, no information loss, low priority, non-real time, asymmetric, and asynchronous uplink

    and downlink traffic.

    Course Name P-12

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    Some parameters are related with traffic mode

    PPP session time: the duration of each session RRC connected time: the RRC connected time in each session

    Packet transmission time: the packet transmission time in each RRC connection

    Ratio of RRC to PPP = RRC connected time/PPP session time

    Ratio of Packet to RRC=Packet transmission time/RRC connected time

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    One session includes many packet calls, and one packet call includes many packets.

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    Considering single voice user, the entire service period falls into OFF and ON periods. In the

    ON period, users send fixed size packet in fixed time and generate voice data. In the OFF

    period, no data is generated.

    Various applications such as voice, video and data, form video meeting service frames

    through different protocol stacks.

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    The Web model is the most complicated in all models. The measurement for HTTP

    services indicate that large web pages are formed by relatively small objects. That is

    to say, each page consists of some web embedded objects, such as main page,

    embedded image, and embedded Java program.

    In a package call, package service characteristics are related to the Web server and

    browser HTTP version. Currently, HTTP/1.0 and HTTP/1.1 are used. The maximum

    difference of the two versions are that the TCP connection of transmission layer of

    main object and embedded object are different.

    In HTTP/1.0, each main object and embedded object of the Web page download use

    different TCP connections. In the browsing process of most customer terminals,

    embedded objects use multiple TCP connections at the same time, which is called

    HTTP/1.0 - burst mode transmission. Meanwhile, the maximum TCP number can be

    connected is configurable. Most browser is set to 4. When the embedded object exceeds

    the number, a new TCP connection is set up, and the original connection is built. TCP

    overhead and congestion control is based on each object.

    In HTTP/1.1, consecutive TCP connections are used to download object. That is, the

    transmission object connected in serial on a single TCP connection is called HTTP/1.1 --

    consecutive mode transmission. TCP overhead and congestion control are based on

    each connection.

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    Outlook email is used mostly on the market. The outlook transmission is dependent

    on remote procedure call (RPC) and uses complex protocols. When invoking the

    Outlook, there are 11 activated TCP connections. Each email processing consists of

    multiple MAPI segment elements. Each MAPI segment processing can be divided into

    more specific segments

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    PPP: Peer-Peer Protocol

    Course Name P-18

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    Single User Throughput in Busy Hour = PPP Session Time (s) x PPP Session Duty

    Ratio x Bearer Rate (kbit/s) x [1/(1 - BLER)] x BHSA x Penetration Ratex1Peak to

    Average Ratio/3600

    According to the Erl, single-user busy hour throughput of VoIP service =Erl x Mean Bit

    Rate (kbps) x BHSA x Penetration Rate

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