Optimization of data transmission for transport sector user case tmb
Download
1 / 20

Optimization of DATA Transmission for Transport Sector User case, TMB - PowerPoint PPT Presentation


  • 63 Views
  • Uploaded on

Optimization of DATA Transmission for Transport Sector User case, TMB. David Lumbreras Project Area Manager. In this presentation:. User requirements High efficiency in AVL Systems Comparing methods An example: TMB case. Fleet Manager Requirements:. Traffic Bus Regulation.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about ' Optimization of DATA Transmission for Transport Sector User case, TMB' - gen


An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
Optimization of data transmission for transport sector user case tmb

Optimization of DATA Transmission for Transport SectorUser case, TMB

David LumbrerasProject Area Manager


In this presentation
In this presentation:

  • User requirements

  • High efficiency in AVL Systems

    • Comparing methods

  • An example: TMB case


Fleet Manager Requirements:

  • Traffic Bus Regulation.

  • Frequency Improvement.

  • Customer Service.

  • Investment Optimization.

  • Passengers Safety


How to do it?

  • Voice Communications with the Control Centre.

    • Half-duplex and duplex voice calls.

  • Status and short data transmission.

  • Vehicle sensors transmission.

  • MMI integrated on driver’s dashboard.

  • Interaction with passenger information system.

  • GPS-based location system.


How often is needed?

  • Data User Requirements:

    • Continuous Actualization of Data in Control Centre.

    • Normally 20/ 30 second each Terminal.



Bus on-board equipment

Example: CONFIGURATION STRUCTURE

Control unit

Bus driver’s MMI

TETRA MS

engine, speed, doors...

Telemetry sensors

PEI

Bus driver’s audio system

control

Audio interface

- PTT

- Emergency button

- Call request

Billing system

data

Passenger information system

DISPLAY

Ambience listening microphone

Hands-free audio kit

Other peripherals

Handset


Driver’s MMI console

Bus on-board equipment

Example: INSTALLATION DETAILS

Bus system interface

Control unit

TETRA radio

Passenger information system

Micro speaker & hands-free mic



MCCH Occupation with TETRA technology

Nº slots

4

100%

3

75%

2

50%

49%

1 (MCCH)

25%

Type of service

Random SDS

Random PD

Polling SDS

Polling PD

High efficiency in AVL, Comparing Methods

  • In this type of scenario it is necessary to analyse carefully the geographic positioning as the stronger requirement.

    • Short Data Messages (SDS) comparing to Packet Data Protocol (PDP), the conclusions are:

      With these conclusions, we are going to work with SDS polling to obtain the geographic positioning.

Scenario example

  • 500 buses.

  • 30 seconds of latency for all buses.

  • 20 bytes of information size.

  • 3 coverage sites (SBS).


Mobile in MCCH with TETRA technology

SwMi

D_STATUS_REQ

1/2 slot downlink

Status REQUEST+ slot granting (1).

ACK + SDS_DATA

1 slot uplink

Ack to Status + SDS data (160 bits)

ACK

1/2 slot downlink

SwMi acknowledge

System considerations.

Terminal considerations.

High efficiency in AVL, Comparing Methods

  • With the standard SDS procedure the requirement for the network is still strong.

  • So now, it is necessary to think beyond the TETRA technology.

  • New option improving the efficiency.

  • Packets used in MCCH to transmit 20 bytes of data.


MCCH Occupation with TETRA technology

Nº slots

4

100%

3

75%

2

50%

49%

1 (MCCH)

25%

The best

one

Type of service

Optimised

Polling SDS

Random SDS

Random PD

Polling SDS

Polling PD

High efficiency in AVL, Comparing Methods

  • New optimised polling SDS is the best solution to this type of application.

Scenario example

  • 500 buses.

  • 30 seconds of latency for all buses.

  • 20 bytes of information size.

  • 3 coverage sites (SBS).


TMB User case with TETRA technology

8 SBS´s

1300 buses


High efficiency in AVL, Comparing Methods with TETRA technology

  • With the best service selected…

    Now it is necessary to think how we are going to synchronize the different CCHs.

  • Here using 1MCCH and 3 SCCH per SBS:

    • 15% of the control channel is used for geographic positioning.

  • To obtain this percentage it is necessary to synchronise all CCHs

  • Real scenario example

    • 1300 buses.

    • 20 seconds of latency for all buses.

    • 20 bytes of information size.

    • 8 coverage sites (SBS).


    TMB user case, High efficiency in AVL with TETRA technology

    Synchronising the polling means...

    ...obtaining following figures:

    • 8 SBS x 4 CCHs = 24 CCHs to request the bus position

    • 1300 buses / ( 20 seconds x 24 CCHs ) = 3 buses per second per CCH

      Doing this polling is possible to obtain success with the application.


    TMB user case, High efficiency in AVL with TETRA technology

    Synchronising the polling means...

    The problem is:

    External Application has not the capability to know where is located every bus in every second.

    • So for this reason Infrastructure manufacturers have to give the synchronism solution.

    • In that case the SwMi has to give to the applications provider several commands to introduce the buses to be polling, then…

      ..... polling answer will come from the SwMi Automatically.


    TMB user case, High efficiency in AVL with TETRA technology

    Commands used by the application provider:

    NEBULA

    OUTPUT

    COMMANDS

    User Application

    List of commands needed to manage this application:

    • AVL-ADD-ISSI

    • AVL-DEL-ISSI

    • AVL-START-POLLING

    • AVL-STOP-POLLING

    • AVL-GET-POSITION


    This three ISSI lines will be with TETRA technology

    sent to poll the buses in one second

    In 20 seconds all ISSIs on the table have to be sent to the base stations to poll the complete buses fleet

    TMB user case, High efficiency in AVL

    How the SwMi uses the ISSI list to poll at same time every CCH?

    Real time operative system.

    SwMi knows where all buses are placed so it can request them as same time with an internal table.


    TMB user case, High efficiency in AVL with TETRA technology

    • Conclusions:

      • This solution can save around 60% of the channels in the network, with respect to the other alternatives

      • Only synchronized polling generated by the SwMi can manage with success this amount of data traffic

      • Thinking beyond the TETRA technology manufacturers can give to the customers the final solution


    Optimization of data transmission for transport sector user case tmb thank you for your attention

    Optimization of DATA Transmission for Transport Sector with TETRA technologyUser case, TMBThank you for your attention

    David LumbrerasProject Area Manager


    ad