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/*
* Copyright (c) 2021 Cisco and/or its affiliates.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <hicn/transport/utils/shared_ptr_utils.h>
#include <protocols/rtc/rtc_rc.h>
namespace transport {
namespace protocol {
namespace rtc {
const int ROUND_HISTORY_SIZE = 10; // equivalent to two seconds
const int ROUND_TO_WAIT_FORCE_DECISION = 5;
// once congestion is gone, we need to wait for k rounds before changing the
// congestion cause in the case it appears again
const int ROUND_TO_RESET_CAUSE = 5;
const int MIN_IST_VALUE = 150; // samples of ist larger than 150ms are
// discarded
const double CONGESTION_FREE_QUEUEING_DELAY = 10;
enum class CongestionCause : uint8_t {
COMPETING_CROSS_TRAFFIC,
FRIENDLY_CROSS_TRAFFIC,
UNKNOWN_CROSS_TRAFFIC,
LINK_CAPACITY,
UNKNOWN
};
class RTCRateControlIAT : public RTCRateControl {
public:
RTCRateControlIAT();
~RTCRateControlIAT();
void onNewRound(double round_len);
void onDataPacketReceived(const core::ContentObject &content_object,
bool compute_stats);
auto shared_from_this() { return utils::shared_from(this); }
private:
void reset_congestion_statistics();
double compute_iat_stdev(std::vector<double> v);
CongestionCause apply_classification_tree(bool force_reply);
private:
uint32_t rounds_since_last_drop_;
uint32_t rounds_without_congestion_;
uint32_t rounds_with_congestion_;
double last_queue_;
uint64_t last_rcv_time_;
uint64_t last_prod_time_;
uint32_t last_seq_number_;
double target_rate_avg_;
// Iat values are not immediately added to the congestion free set of values
std::array<std::vector<double>, ROUND_HISTORY_SIZE> iat_on_hold_;
uint32_t round_index_;
// with congestion statistics
std::vector<double> iat_;
std::vector<double> received_rate_;
std::vector<double> target_rate_;
// congestion free statistics
std::vector<double> congestion_free_iat_;
CongestionCause congestion_cause_;
};
} // end namespace rtc
} // end namespace protocol
} // end namespace transport
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