[sim-wg] Status of Power TOSSIM-2

[Venkatesh S.]

Hello everyone,

I am giving some final touches to the power profiling in Tossim for T2.   

Modules Completed:
  1) CPU power profiling - Monitoring the MCU Control register of the microcontroller ATMega128 and computing the power consumption of each CPU state. 
  2) LED Power profiling - Monitoring the PortA pins (A0, A1 and A2) to which Leds are connected, and computing the power consumption for each Led.
  3) Radio power profiling - Monitoring the SPI read and write to the radio, and computing the power consumption of Radio transmit(Tx) and receive (Rx) states.

Other Modules:
  
  a) Noise characterization using MCU's ADC

        We use the existing Closest Pattern Matching (CPM) developed by HyunagJune Lee et al to generate the noise samples for a  simulation (say X).  We then obtain the Tx power level (say Y) of the remaining nodes by peeking into the CC1000's internal registers. The "gain" parameter specifies the power level at the receiver (say Z). Using X, Y, and Z we finally compute the RSSI(dBm) for a reciever to sense the medium based on which the MAC layer decides "busy" and "free" channel. 

  b) Support for B-MAC (CC1000 MAC) functionality for simulation.
        Three files were modified in order to run the B-MAC simulation.  At the HPL level, each byte of transmission is signalled to all the other nodes.  It is a byte level simulation to suit the CC1000 radio. B-MAC with acknowledgements also works satisfactorily.  

  c) Support for obtaining node expended energy at the end of the simulation. (modified tossim.c, tossim.i files and used SWIG tool).

ToDo :

    i) Thorough testing and comparision of power profiling with respect to AVRORA.  I am currently working on this.  

   ii) Should add the functionality of getting only connectivity based node Tx Power level. 

  iii) Should add the functionality of signalling the SPI read events only to the nodes that are connected to the transmitting node. 

   iv) Monitoring the External Memory access and computation of energy for read and write to memory.  
Specifically, it is adding the AT45DB functionality for simulation. Since this is restricted to power profiling, we do not intend to create or emulate the memory. Any pointers/feedback will help a lot.  

    v) A packet level simulation module for CC1000. Any pointers on this will help immensely.


--
Cheers,
Venkatesh S














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