{'fraction_non_alphanumeric': 0.019619500594530322, 'fraction_numerical': 0.0023781212841854932, 'mean_word_length': 4.705084745762712, 'pattern_counts': {'":': 0, '<': 0, '<?xml version=': 0, '>': 0, 'https://': 0, 'lorem ipsum': 0, 'www.': 0, 'xml': 0}, 'pii_count': 0, 'substrings_counts': 0, 'word_list_counts': {'cursed_substrings.json': 0, 'profanity_word_list.json': 0, 'sexual_word_list.json': 0, 'zh_pornsignals.json': 0}}
ACTIVE PACKET DISCARD MECHANISM

Traffic and congestion control in ATM is an open issue yet. When dealing with packet oriented communications over an ATM network, some problems arise. The most important one is that of having to discard an entire packet when only one ATM cell of that packet has been lost. Thus, we can see that the important parameter in this type of communications is not the Cell Loss Ratio (CLR), but the Packet Loss Ratio (PLR). This paper presents a general and efficient congestion control mechanism for packet oriented communications over ATM. General enough as to be able to maintain a minimum required QoS for every kind of traffic crossing an ATM network and efficient in the sense that the discarded cells are selectively chosen as to cause a minimum harm to the connections. The proposed mechanism is called Active Packet Discard (APD) and it derives from the Partial Packet Discard (PPD) and Early Packet Discard (EPD) mechanisms that can be found in (ROFL 1994). Its objective is to use a threshold in the buffer to control that there is always enough free space to queue the set of initial cells of every packet. The usefulness of this mechanism becomes clear if we think that critical information of the connection (like synchronization or control) is located in that set of initial cells. Then, we could guarantee a very low CLR for the set of initial cells, and the connection can be maintained even in the worst conditions. The proposed mechanism can be applied in heterogeneous connection environments as well as in real time communication environments. * This work has been funded by the Spanish Ministry of Education (CICYT) under grant number