ﻣﺪل ﺳﺎزي ﮐﻨﺘﺮل ﺟﺮﯾﺎن ﻫﺴﺘﻪﻫﺎي ﭘﺮدازﺷﯽ در ﺷﺒﮑﻪ روي ﺗﺮاﺷﻪ ﺑﯽ ﺳﯿﻢ

Flow Control Modeling in WiNoC

ﭼﮑﯿﺪه: ﺷﺒﮑﻪ روي ﺗﺮاﺷﻪ ﺑﻪ ﻋﻨﻮان ﯾﮏ راهﺣﻞ ﻣﻮﺛﺮ ﺑﺮاي اﺗﺼﺎﻻت درون ﺗﺮاﺷﻪاي ﻣﻌﺮﻓﯽ ﺷﺪه اﺳﺖ. در ﺳﺎلﻫﺎي اﺧﯿﺮ، ﺑﺎ رﺷﺪ ﭼﺸﻤﮕﯿﺮ ﻓﻨﺎوريﻫﺎي ﻧﯿﻤﻪ-رﺳﺎﻧﺎﻫﺎي ﺳﯿﻠﯿﮑﻮﻧﯽ و دﺳﺘﯿﺎﺑﯽ ﺑﻪ آﻧﺘﻦﻫﺎي ﻧﺎﻧﻮ-ﮐﺮﺑﻨﯽ، اﺳﺘﻔﺎده از آﻧﺘﻦﻫﺎي ﺑﯽﺳﯿﻢ درون ﺗﺮاﺷﻪ ﻣﯿﺴﺮ ﺷﺪه اﺳﺖ. اﯾﻦ ﺳﺎﺧﺘﺎر ﺟﺪﯾﺪ ارﺗﺒﺎﻃﯽ، ﺷﺒﮑﻪ روي ﺗﺮاﺷﻪ ﺑﯽﺳﯿﻢ ﻧﺎﻣﯿﺪه ﺷﺪه اﺳﺖ. ﺑﺎ ﺑﻪ ﮐﺎرﮔﯿﺮي ﻣﺴﯿﺮﯾﺎبﻫﺎي ﻣﺠﻬﺰ ﺑﻪ آﻧﺘﻦﻫﺎي ﺑﯽﺳﯿﻢ درون ﯾﮏ ﺗﺮاﺷﻪ ﭼﻨﺪﻫﺴﺘﻪاي، ﻋﻼوه ﺑﺮﮐﺎﻫﺶ ﻓﺎﺻﻠﻪي ﺑﯿﻦ ﻫﺴﺘﻪﻫﺎي دور از ﻫﻢ، ﺗﺎﺧﯿﺮ و ﺗﻮان ﻣﺼﺮﻓﯽ ﺗﺮاﺷﻪ ﻧﯿﺰ ﺑﻪ ﺷﺪت ﮐﺎﻫﺶ ﯾﺎﻓﺘﻪ اﺳﺖ. ﺑﺎ اﯾﻦ وﺟﻮد، ﺑﺪﻟﯿﻞ ﺗﻌﺪاد ﻣﺤﺪود ﮐﺎﻧﺎلﻫﺎي ﺑﯽﺳﯿﻢ در ﯾﮏ ﺗﺮاﺷﻪ و اﺳﺘﻔﺎده ﻣﺸﺘﺮك ﻫﻤﻪ ﻫﺴﺘﻪﻫﺎ از اﯾﻦ ﮐﺎﻧﺎلﻫﺎ، ﮐﻨﺘﺮل ازدﺣﺎم و ﮐﻨﺘﺮل ﺟﺮﯾﺎن در اﯾﻦ ﺷﺒﮑﻪﻫﺎ ﺑﻪ ﭼﺎﻟﺸﯽ ﻣﻬﻢ ﺗﺒﺪﯾﻞ ﺷﺪه اﺳﺖ. در اﯾﻦ ﻣﻘﺎﻟﻪ ﻣﺪﻟﺴﺎزي رﯾﺎﺿﯽ ﮐﻨﺘﺮل ﻧﺮخ ﺟﺮﯾﺎن ﻫﺴﺘﻪﻫﺎي ﭘﺮدازﺷﯽ در ﺷﺒﮑﻪ روي ﺗﺮاﺷﻪ ﺑﯽﺳﯿﻢ ﻣﻮرد ﺑﺮرﺳﯽ ﻗﺮار ﮔﺮﻓﺘﻪ اﺳﺖ. در اﺑﺘﺪا، ﻣﺴﺎﻟﻪ ﮐﻨﺘﺮل ﻧﺮخ ﺟﺮﯾﺎن ﻫﺴﺘﻪﻫﺎ ﺑﺮاي ﺗﺮاﻓﯿﮏﻫﺎي ﺑﻬﺘﺮﯾﻦ ﺗﻼش و ﮔﺎراﻧﺘﯽ ﺷﺪه ﺑﻪ ﻓﺮم ﯾﮏ ﻣﺴﺎﻟﻪ ﺑﻬﯿﻨﻪﺳﺎزي ﺑﺮ ﭘﺎﯾﻪ ﺗﺎﺑﻊ ﺳﻮدﻣﻨﺪي ﺑﺎ در ﻧﻈﺮ ﮔﺮﻓﺘﻦ ﻣﺤﺪودﯾﺖﻫﺎي ﭘﻬﻨﺎيﺑﺎﻧﺪ ﻟﯿﻨﮏﻫﺎي ﺳﯿﻤﯽ/ﺑﯽﺳﯿﻢ، ﻧﺮخ ﺟﺮﯾﺎن ﻫﺴﺘﻪﻫﺎي ﭘﺮدازﺷﯽ و اﻟﮕﻮﻫﺎي ﻣﺴﯿﺮﯾﺎﺑﯽ ﻓﺎﻗﺪ ﺑﻦ ﺑﺴﺖ ﻣﺪلﺳﺎزي ﺷﺪه اﺳﺖ. در اداﻣﻪ ﺑﺮاي رﺳﯿﺪن ﺑﻪ ﯾﮏ ﺟﻮاب ﻗﺎﺑﻞﻗﺒﻮل، ﻣﺴﺎﻟﻪ اوﻟﯿﻪ ﺑﻪ ﺷﮑﻞ ﯾﮏ ﻣﺴﺎﻟﻪ دوﮔﺎن ﺑﺪون ﻣﺤﺪودﯾﺖ ﺗﺒﺪﯾﻞ ﺷﺪه و ﺑﺎ روش ﺗﺼﻮﯾﺮﮔﺮادﯾﺎن، ﺟﻮاب دوﮔﺎن ﻣﺴﺎﻟﻪ ﺑﺪﺳﺖ آﻣﺪه اﺳﺖ. در ﻧﻬﺎﯾﺖ، ﺑﺮاﺳﺎس ﺟﻮاب ﺑﻬﯿﻨﻪ ﺑﺪﺳﺖ آﻣﺪه اﻟﮕﻮرﯾﺘﻤﯽ ﺗﮑﺮارﭘﺬﯾﺮ ﺑﺮاي ﮐﻨﺘﺮل ﻧﺮخ ﺟﺮﯾﺎن ﻫﺴﺘﻪﻫﺎي ﭘﺮدازﺷﯽ درون ﺗﺮاﺷﻪ ﭘﯿﺸﻨﻬﺎد ﺷﺪه اﺳﺖ. ﺗﺤﻠﯿﻞ و ﺷﺒﯿﻪ ﺳﺎزي ﻋﻤﻠﮑﺮد اﻟﮕﻮرﯾﺘﻢ ﭘﯿﺸﻨﻬﺎدي ﺗﺤﺖ اﻟﮕﻮﻫﺎي ﺗﺮاﻓﯿﮑﯽ ﻣﺼﻨﻮﻋﯽ و اﻟﮕﻮرﯾﺘﻢﻫﺎي ﻣﺴﯿﺮﯾﺎﺑﯽ ﻓﺎﻗﺪ ﺑﻦ ﺑﺴﺖ ﻧﺸﺎن داده اﺳﺖ ﮐﻪ اﻟﮕﻮرﯾﺘﻢ ﭘﯿﺸﻨﻬﺎدي ﺗﻮاﻧﺴﺘﻪ ﻧﺮخ ﺟﺮﯾﺎن ارﺳﺎﻟﯽ ﻣﻨﺎﺑﻊ ﺗﺮاﻓﯿﮑﯽ )ﻣﻨﺒﻊ ﺟﺮﯾﺎنﻫﺎ( را ﺑﺎ ﻫﻤﮕﺮاﯾﯽ ﻣﻨﺎﺳﺒﯽ ﮐﻨﺘﺮل و ﺗﻨﻈﯿﻢ ﻧﻤﺎﯾﺪ. ﻫﻤﭽﻨﯿﻦ ﺑﺎ ﺗﺴﺮﯾﻊ در ﻫﻤﮕﺮاﯾﯽ ﻧﺮخ ﺟﺮﯾﺎن ﻫﺴﺘﻪﻫﺎ، ﺗﻮان ﻋﻤﻠﯿﺎﺗﯽ ﺷﺒﮑﻪ ﺑﻬﺒﻮد ﻗﺎﺑﻞ ﻣﻼﺣﻈﻪاي داﺷﺘﻪ اﺳﺖ.

Networks-on-Chip (NoC) is an effective solution to inside on-chip communication problems. In recent years, the advancement of silicon industry and also the production of Carbone Nanotube antennas (CNTs), it is possible to use wireless antennas in the network on chip. This new communication structure is called a Wireless Network on Chip (WiNoC). Using the wireless antenna in multi-core chips led to the reduction in the latency and power consumption. In spite of higher bandwidth of the WiNoCs compared to wire NoCs; their performance can decrease significantly in absence of an effective flow control mechanism. In this paper, the flow control problem is investigated by using a mathematical model in the WiNoC. The aim of this study is showing a correct analysis of cores behaviors with the subject to capacity constraints of links and flow rates. The simulation results of traffic pattern in the WiNoC show that the proposed flow rate control algorithm has been able to control and adjust the flow injection rate of each transmitter with acceptable convergence