Vol.25, NO.6, 2014
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Article Navigation >  Journal of Applied Meteorological Science  > 2014  >  25(6): 761-768
Gu Junxia, Wang Chunfang, Lin Runsheng, et al. Design of communication parameters for Beidou satellite-based early warning information distribution method. J Appl Meteor Sci, 2014, 25(6): 761-768.
Citation: Gu Junxia, Wang Chunfang, Lin Runsheng, et al. Design of communication parameters for Beidou satellite-based early warning information distribution method. J Appl Meteor Sci, 2014, 25(6): 761-768.
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Design of Communication Parameters for Beidou Satellite-based Early Warning Information Distribution Method

  • National Meteorological Information Center, Beijing 100081

  • Received Date: 2014-01-15
  • Rev Recd Date: 2014-09-09
  • Publish Date: 2014-11-30
    Abstract
  • Beidou satellite-based early warning information distribution (BD-EWID) uses short message service of Beidou Navigation Satellite System to distribute early warning information. BD-EWID effectively improves coverage and timeliness of early warning information distribution in China, especially in marine and distant land areas. However, packet length and service frequency of short message are restricted in Beidou Navigation Satellite System. The data amount of a piece of early warning information often exceeds the transmission capacity of one short message. Therefore, long early warning information must be segmented into multiple smaller packets and sent multiple times. However, the more the packets are, the lower the transmission success rate is, and the longer the whole transmission time is. The existing literature has proposed methods of parallel transmission of uplink terminal and unified message compensation to solve these problems in BD-EWID.Transmission times of early warning information and the number of broadcast ID are two important communication parameters in the method of parallel transmission of uplink terminal and the unified message compensation. The transmission times are closely related to the number of packets and transmission success rate of packets, affect the occupancy rate of channel resource in Beidou Navigation Satellite System. The number of broadcast ID is closely related to transmission timeliness, and affects the scale of the whole system. In order to satisfy demands of transmission success rate of the entire early warning information and transmission timeliness, and to save resource, a new design method of those two communication parameters in BD-EWID is proposed.The design method of two communication parameters is described in detail. The relationship of transmissiontimes, the number of packets and transmission success rate are analyzed. An explicit calculation formula of times of transmission is proposed to obtain the optimal value. The larger the number of packets is, or the higher the transmission success rate is, the more the optimal times of transmission are. Also, the relationship of broadcast ID number, transmission timeliness and transmissiontimes are analyzed. An explicit calculation formula of the number of broadcast ID is proposed to obtain the optimal values. The larger the transmission timeliness is, the smaller the number of broadcast ID is. Finally, optimal results are calculated with the transmission success rate and transceiver delay which are obtained from the experiments. With the increase of the number of packets and transmission success rate, optimal times of transmission increases stepwise. With the increase of transmission timeliness, the optimal number of broadcast ID approximately linearly decreases.The proposed design method of communication parameters can be used as a reference of index calculation in the BD-EWID system design phase.
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  • Fig. 1  Architecture of Beidou-based early warning information distribution method

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    Fig. 2  Results of optimal times of transmission K*

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    Fig. 3  Results of optimal number of broadcast ID (NID*)

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    Table  1  List of optimal times of transmission K*

    N σ
    0.9000 0.9900 0.9990 0.9999
    1 1 2 3 3
    2 1 2 3 4
    3 2 2 3 4
    4 2 2 3 4
    5 2 3 3 4
    6 2 3 3 4
    7 2 3 3 4
    8 2 3 3 4
    9 2 3 3 4
    10 2 3 3 4
    11 2 3 4 4
    12 2 3 4 4
    13 2 3 4 4
    14 2 3 4 4
    15 2 3 4 4
    16 2 3 4 4
    17 2 3 4 4
    18 2 3 4 4
    19 2 3 4 4
    20 2 3 4 4
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    Table  2  List of optimal number of broadcast ID (3.8 s≤Tmax < 33.8 s)

    N σ
    0.9000 0.9900 0.9990 0.9999
    1 1 2 3 3
    2 2 4 6 8
    3 6 6 9 12
    4 8 8 12 16
    5 10 15 15 20
    6 12 18 18 24
    7 14 21 21 28
    8 16 24 24 32
    9 18 27 27 36
    10 20 30 30 40
    11 22 33 44 44
    12 24 36 48 48
    13 26 39 52 52
    14 28 42 56 56
    15 30 45 60 60
    16 32 48 64 64
    17 34 51 68 68
    18 36 54 72 72
    19 38 57 76 76
    20 40 60 80 80
    DownLoad: Download CSV

    Table  3  List of optimal number of broadcast ID (Tmax=60 s)

    N σ
    0.9000 0.9900 0.9990 0.9999
    1 1 1 2 2
    2 1 2 3 4
    3 3 3 5 6
    4 4 4 6 8
    5 5 8 8 10
    6 6 9 9 12
    7 7 11 11 14
    8 8 12 12 16
    9 9 14 14 18
    10 10 15 15 20
    11 11 17 22 22
    12 12 18 24 24
    13 13 20 26 26
    14 14 21 28 28
    15 15 23 30 30
    16 16 24 32 32
    17 17 26 34 34
    18 18 27 36 36
    19 19 29 38 38
    20 20 30 40 40
    DownLoad: Download CSV

    Table  4  List of optimal number of broadcast ID (Tmax=180 s)

    N σ
    0.9000 0.9900 0.9990 0.9999
    1 1 1 1 1
    2 1 1 1 2
    3 1 1 2 2
    4 2 2 2 3
    5 2 3 3 4
    6 2 3 3 4
    7 3 4 4 5
    8 3 4 4 6
    9 3 5 5 6
    10 4 5 5 7
    11 4 6 8 8
    12 4 6 8 8
    13 5 7 9 9
    14 5 7 10 10
    15 5 8 10 10
    16 6 8 11 11
    17 6 9 12 12
    18 6 9 12 12
    19 7 10 13 13
    20 7 10 14 14
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    • Received : 2014-01-15
    • Accepted : 2014-09-09
    • Published : 2014-11-30
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