Thanks Thanks:  0
Showing results 1 to 7 of 7

Thread: Eband MW Link Planning Parameters

  1. #1
    Member Reputation: 30
    Join Date
    2010-05-19
    Posts
    24


    Question Eband MW Link Planning Parameters

    Dear Friends,

    It would be appreciated to share any training or manual for Eband MW link planning.
    I need to know which parameters should be considered in planning of Eband mainly and what are recommendations.
    For example planned fade margin for traditional ones is 25-35 dB depending on link status as I know. What about Eband? and also about Threshold Degradation or its equivalent ? and other parameters that should be considered.

    Thanks for Help! I am in urgency in this regard !

    BR,
    Omid

  2. # ADS
    Circuit advertisement
    Join Date
    Always
    Posts
    Many
     

  3. #2
    Member Reputation: 626
    Join Date
    2008-10-31
    Posts
    625


    Default Re: Eband MW Link Planning Parameters

    Check your planning tool, may be it already has a MW link template for E-Band.

  4. #3
    Member Reputation: 30
    Join Date
    2010-05-19
    Posts
    24


    Default Re: Eband MW Link Planning Parameters

    I am using Atoll MW and unfortunately I couldn't find anything in this regard.
    BR.
    Omid

  5. #4
    Member Reputation: 30
    Join Date
    2010-05-19
    Posts
    24


    Default Re: Eband MW Link Planning Parameters

    Dears,

    No any other idea or sample?

    BR.
    Omid

  6. #5
    Member Reputation: 626
    Join Date
    2008-10-31
    Posts
    625


    1 out of 1 members found this post helpful.

    Default Re: Eband MW Link Planning Parameters

    What the version are you using?

    1.1.3.jpg

    Working with the Microwave E-Band Propagation Model

    The Microwave E-Band Propagation Model is suited for microwave links in the 60 to 90 GHz band, in order to calculate the useful signal as well as the interfering signal.

    The parameters of the propagation model, including some of its coefficients, can be modified using the Microwave E-Band Propagation Model Properties dialog box.

    To define the parameters of the Microwave Propagation Model:

    1. Select the Parameters explorer.

    2. Click the Expand button () to expand the Propagation Models folder.

    3. Right-click the Microwave E-Band Propagation Model. The context menu appears.

    4. Select Properties from the context menu. The Properties dialog box appears.

    5. Click the Parameters tab. Under Heights, you can set the following parameter:

    - Clutter taken into account in diffraction: Select "1 - Yes" to have Atoll take clutter height information into account when calculating diffraction. Otherwise, select "0 - No". If you choose to take clutter height into account, Atoll uses the clutter height information in the clutter heights file if available. Otherwise, it uses average clutter height specified for each clutter class in the clutter classes.

    Under Profile Extraction, you can set the following parameter:

    - Step: Define the resolution in metres to be used to extract the profile. If you enter "0" as the resolution, Atolll uses the highest resolution of the geographic maps considered in the profile (i.e., DTM, clutter classes and clutter height maps).

    Under Diffraction, you can set the following parameters:

    - Method: Select the method that will be used to calculate diffraction.

    - Deygout

    - Epstein-Peterson

    - Deygout with correction

    - Millington

    - ITU 452-11

    - Full Deygout

    Under Vegetation, you can set the following parameters:

    - Method: Select the method that will be used to calculate attenuation due to vegetation:

    - No attenuation: No attenuation will be calculated.

    - ITU-R P.833-4: Attenuation will be calculated according to ITU-R P.833-4 recommendations.

    - CCI-Report 236-2: Attenuation will be calculated according to CCI-Report 236-2 recommendations.

    - A1: Enter the value of the A1 coefficient.

    - Alpha: Enter the value of the Alpha coefficient. A1 and Alpha coefficients are only used for the "ITU-R P.833-4" method. They are used to calculate the maximum attenuation experienced by a transmitter or a receiver site located within a vegetation area. The maximum attenuation is taken into consideration to calculate the attenua­tion due to vegetation. For more information on how the value is used, see the Technical Reference Guide.

    Under Gaseous attenuation, you can set the following parameter:

    - Method: Select the method that will be used to calculate the attenuation (dB) due to atmospheric gases:

    - No attenuation: No attenuation will be calculated.

    - ITU-R P.676-1&2: Attenuation will be calculated according to ITU-R P.676-1 and ITU-R P.676-2 recommenda­tions.

    - ITU-R P.676-3: Attenuation will be calculated according to ITU-R P.676-3 recommendations.

    - ITU-R P.676-6&7: Attenuation will be calculated according to ITU-R P.676-6 and ITU-R P.676-7 recommenda­tions.

    Under Rain attenuation, you can set the following parameters:

    - Method: Select the method that will be used to calculate the attenuation due to the rain. The rain attenuation will be considered for calculations in rain conditions only.

    - No attenuation: No attenuation will be considered in the total propagation losses.

    - Full path: The entire path will be considered as attenuated by the rain. This method is based on ITU-R P.530-14 recommendations.

    - Rain cell: Atoll will determine a rain cell and the attenuation will depend on the path position in the rain cell. The part of the path in the rain cell will be considered as fully attenuated while the part outside will experience a lower attenuation. This method is based on ITU-R P.452-12 recommendations.

    - Rainfall rate: Select the method that will be used to evaluate the rainfall rate.

    - Property at 0.01% of the link: Atoll will use the rainfall rate set in the property of the link. It is the rainfall rate exceeded 0.01% of the average year.

    - ITU-R P.837-4: The rainfall rate will be based on ITU-R P.837-4 recommendations.

    - Crane: The rainfall rate will be based on Crane method.

    - ITU-R P.837-5,6: The rainfall rate will be based on ITU-R P.837-5 and ITU-R P.837-6 recommendations.

    - Time percentage for which rainfall rate is exceeded: The time percentage of the average year the rainfall rate is exceeded. This parameter is considered when using ITU-R P.837-4 and ITU-R P.837-5,6 recommendations or Crane to calculate the rainfall rate.

    - Specific rainfall rate: Select the method that will be used to determine the specific rainfall rate.

    - ITU-R P.838-1: The specific rainfall rate will be based on ITU-R P.838-1 recommendations.

    - ITU-R P.838-3: The specific rainfall rate will be based on ITU-R P.838-3 recommendations.

    Under Reflections, you can set the following parameters:

    - Method: Select the 2 rays model (ITU-R P.530) method if you want to consider the attenuation due to reflections in the total propagation losses. Otherwise, select No attenuation.

    - Antenna height above the reflection plan: Select the method to be used to calculate antenna heights above the reflection plan. You can choose between the Simplified method and the method with Linear regression on the area.

    - Terrain roughness: Select the method to be used to calculate the terrain roughness. You can choose between the Root mean square method, the Standard deviation method and the Interdecile range method.

    - Attenuation calculation: Select the method to be used to calculate the amplitude of the reflected signal. You can choose between the Simplified method and the method with Equivalent reflection coefficient taken into account.




    When there are more than one reflection zone along the calculated profile, Atoll considers the highest attenuation over the zones.


    6. Click the Clutter tab. Under Clutter Consideration, you can set the following parameters for each clutter class:

    - Clearance per clutter class: Define a clearance (in metres) around each transmitter and each receiver site for each clutter class. The clearance information is used when clutter is taken into account in diffraction. Both ground alti­tude and clutter height are considered along the whole profile except over a specific distance around the trans­mitter and the receiver sites (i.e., the clearance), where Atoll bases its calculations only on the DTM.

    - Clutter categories: Select a clutter category for each clutter class. Clutter categories are taken into consideration when studying reflections and must be defined in order to analyse reflections along the profile. Clutter categories are ITU-standardised clutter classes. For information on clutter categories, see "Global Parameters".

    7. Click OK.

    For more information on the parameters of the Microwave E-Band Propagation Model, see the Technical Reference Guide.

  7. #6
    Member Reputation: 626
    Join Date
    2008-10-31
    Posts
    625


    1 out of 1 members found this post helpful.

    Default Re: Eband MW Link Planning Parameters

    one more snapshot

    1.1.4.jpg

  8. #7
    Member Reputation: 30
    Join Date
    2010-05-19
    Posts
    24


    Default Re: Eband MW Link Planning Parameters

    Thanks Cepillo ,

    I am using 3.2.1 and unfortunately there is no E-Band template in it.
    also what I need is recommendation , for example Fade Margin or Threshold Degradation considerations that would not be available in Template. I know that this planning parameters are mostly vendor based .But I guess there should be some general recommendations at least for availability requirements or maybe other related parameters that telecom operators are currently using.

    BR,
    Omid

Tags for this Thread

Bookmarks

Bookmarks

Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •