Algorithm 1: Period of computation of power self-optimizing process

Input: Battery level, Charging current Output: Transmission period Period = 10; IncreaseLevel = 30; DecreaseLevel = 10; MaxPeriod = 120; MultistepOperationTime = 10; SafetyLevel = 80%; $q$= 1;

repeat

if Battery level ≥ SafetyLevel then // select state according to battery level    NextState = 1;    else    NextState = 0;    endif    $P_{total}= P_{mcu}+(P_m\times q) / \mathrm{Preiod}$; // calculate total power    if NextState = 1 then // decide period    if $P_{total}>P_{charge}$ then      Period = Period + IncreaseLevel;      if Period >= MaxPeriod then      Period = MaxPeriod;      endif      else      Period = Period − DecreaseLevel;      if Period < MultistepOperationTime then      Period = MultistepOperationTime;      endif      endif

endif