Ashin Walpola
0e9525162d
obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but that tree was gitignored, so a clone of this repository could not build the firmware it ships. It is now committed here as ordinary files in its own folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP bridge's signature verification (--trust) used on the bench. Nothing is fetched from or pushed to the colleague's repository; this repository and its remotes carry everything. The folder's own .gitignore keeps build output, downloaded components and private key material out, as it did there; the committed file set is identical to that repository's tracked files. The ESP32-C5 is still flashed from obu-firmware/, which only takes vanetza-idf from microbu-esp32c5/, so the two stay separate folders. FLASHING.md says how to take a newer version of the colleague's tree (copy it over the folder, rebuild, test, commit).
111 lines
3.3 KiB
C++
111 lines
3.3 KiB
C++
#ifndef LIMERIC_HPP_OPCJEHBN
|
|
#define LIMERIC_HPP_OPCJEHBN
|
|
|
|
#include <vanetza/common/clock.hpp>
|
|
#include <vanetza/common/hook.hpp>
|
|
#include <vanetza/common/unit_interval.hpp>
|
|
#include <vanetza/dcc/channel_load.hpp>
|
|
#include <vanetza/dcc/duty_cycle_permit.hpp>
|
|
#include <boost/circular_buffer.hpp>
|
|
#include <boost/optional/optional.hpp>
|
|
#include <chrono>
|
|
|
|
namespace vanetza
|
|
{
|
|
|
|
// forward declaration
|
|
class Runtime;
|
|
|
|
namespace dcc
|
|
{
|
|
|
|
/**
|
|
* LIMERIC adapted to ETSI ITS
|
|
*
|
|
* This implementation follows TS 102 687 v1.2.1 section 5.4
|
|
* Optionally, the dual-alpha convergence proposed in [1] can be enabled.
|
|
*
|
|
* [1] Ignacio Soto, Oscar Amador, Manuel Uruena, Maria Calderon
|
|
* "Strengths and Weaknesses of the ETSI Adaptive DCC Algorithm: A Proposal for Improvement"
|
|
* DOI: 10.1109/LCOMM.2019.2906178
|
|
*/
|
|
class Limeric : public DutyCyclePermit
|
|
{
|
|
public:
|
|
/**
|
|
* Limeric paremeters as given by TS 102 687 v1.2.1, Table 3
|
|
*/
|
|
struct Parameters
|
|
{
|
|
UnitInterval alpha { 0.016 }; /*< also named alpha_low if dual-alpha is enabled */
|
|
UnitInterval beta { 0.0012 };
|
|
UnitInterval delta_max { 0.03 }; /*< upper bound permitted duty cycle */
|
|
UnitInterval delta_min { 0.0006 }; /*< lower bound permitted duty cycle */
|
|
double g_plus_max = 0.0005;
|
|
double g_minus_max = -0.00025;
|
|
ChannelLoad cbr_target { 0.68 };
|
|
Clock::duration cbr_interval = std::chrono::milliseconds(100); /*< algorithm is scheduled every second interval */
|
|
};
|
|
|
|
struct DualAlphaParameters
|
|
{
|
|
UnitInterval alternate_alpha { 0.1 }; /*< called alpha_high in [1] */
|
|
UnitInterval threshold { 0.00001 }; /* heuristically determined threshold for switching between alphas */
|
|
};
|
|
|
|
Limeric(Runtime&);
|
|
Limeric(Runtime&, const Parameters&);
|
|
~Limeric();
|
|
|
|
/**
|
|
* Report new channel load measurement
|
|
* \param cl channel load measurement
|
|
*/
|
|
void update_cbr(ChannelLoad);
|
|
|
|
/**
|
|
* Get current averaged CBR.
|
|
* \note The result incorporates previous measurements as well as the averaged CBR during last periodic update.
|
|
* \return averaged CBR
|
|
*/
|
|
ChannelLoad average_cbr() const;
|
|
|
|
/**
|
|
* Get permitted duty cycle as calculated by the last periodic update
|
|
* \return permitted duty cycle
|
|
*/
|
|
UnitInterval permitted_duty_cycle() const override { return m_duty_cycle; }
|
|
|
|
/**
|
|
* Called every time the permitted duty cycle is updated
|
|
* \param this instance itself
|
|
* \param time point for which algorithm update has been scheduled
|
|
*/
|
|
HookRegistry<const Limeric*, Clock::time_point> on_duty_cycle_change;
|
|
|
|
/**
|
|
* Configure dual-alpha convergence
|
|
* \param params dual-alpha parameters, boost::none disables dual-alpha convergence
|
|
*/
|
|
void configure_dual_alpha(const boost::optional<DualAlphaParameters>& params);
|
|
|
|
private:
|
|
void calculate(Clock::time_point);
|
|
void schedule();
|
|
UnitInterval calculate_duty_cycle() const;
|
|
|
|
Runtime& m_runtime;
|
|
Parameters m_params;
|
|
boost::optional<DualAlphaParameters> m_dual_alpha;
|
|
ChannelLoad m_channel_load; /*< moving average channel load */
|
|
UnitInterval m_duty_cycle;
|
|
boost::circular_buffer<ChannelLoad> m_cbr;
|
|
Hook<const Limeric*, Clock::time_point> m_duty_cycle_change;
|
|
};
|
|
|
|
} // namespace dcc
|
|
} // namespace vanetza
|
|
|
|
#endif /* LIMERIC_HPP_OPCJEHBN */
|
|
|