106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
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#ifndef FULLY_MESHED_STATE_MACHINE_HPP_YPE958OH
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#define FULLY_MESHED_STATE_MACHINE_HPP_YPE958OH
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#include <vanetza/common/clock.hpp>
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#include <vanetza/dcc/channel_load.hpp>
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#include <vanetza/dcc/state_machine.hpp>
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#include <boost/circular_buffer.hpp>
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#include <boost/optional.hpp>
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namespace vanetza
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{
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namespace dcc
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{
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// constants
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static constexpr Clock::duration NDL_minDccSampling = std::chrono::milliseconds(100);
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class State
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{
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public:
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virtual Clock::duration transmission_interval() const = 0;
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virtual const char* name() const = 0;
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virtual ~State() {}
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};
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class Relaxed : public State
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{
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public:
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Clock::duration transmission_interval() const override;
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const char* name() const override;
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};
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class Active : public State
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{
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public:
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Active();
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void update(double min, double max);
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Clock::duration transmission_interval() const override;
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const char* name() const override;
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private:
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static const std::size_t sc_substates;
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std::size_t m_substate;
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};
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class Restrictive : public State
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{
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public:
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Clock::duration transmission_interval() const override;
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const char* name() const override;
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};
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/**
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* Fully meshed TRC state machine as per TS 102 687 v1.1.1
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*
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* States are modelled according to C2C-CC DCC Whitepaper / BSP v1.2
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* State transitions are deferred internally for ramping up and cooling down over time.
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*/
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class FullyMeshedStateMachine : public StateMachine
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{
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public:
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FullyMeshedStateMachine();
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~FullyMeshedStateMachine();
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/**
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* Notify state machine about current channel load.
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* This method expects to be called in regular intervals
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* of NDL_minDccSampling length.
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*/
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void update(ChannelLoad channel_load);
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/**
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* Get currently allowed maximum message rate depending on state
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* \return messages per second
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*/
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double message_rate() const;
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/**
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* Get advised transmission interval between consecutive messages
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* \return message transmission interval
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*/
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Clock::duration transmission_interval() const;
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/**
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* Get state machine's active state
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*/
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const State& state() const;
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private:
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double max_channel_load() const;
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double min_channel_load() const;
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Relaxed m_relaxed;
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Active m_active;
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Restrictive m_restrictive;
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State* m_state;
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boost::circular_buffer<ChannelLoad> m_channel_loads;
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};
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} // namespace dcc
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} // namespace vanetza
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#endif /* FULLY_MESHED_STATE_MACHINE_HPP_YPE958OH */
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