Energy efficiency multiple access protocol design
Date Issued
2007
Date
2007
Author(s)
Liang, Yu-Jia
DOI
en-US
Abstract
In this thesis, we propose a general mathematic model under infinite traffic load for various multiple access protocols and aim at the designing of optimization of energy efficiency. We generally model the ALOHA, Non-persistent and 1-persistent CSMA, and GRAP protocols using embedded Markov chain to obtain the performances of throughput, delay and energy efficiency. However, the infinite traffic loads implicit express the independence of backoff time and aggregate arrival rate. We loosen this independence of backlogged users and propose the prototype of unified MAC protocol which shows the correlation of protocol and backoff mechanism. In intuition, increase average backoff time increases the delay as well. In the mean while, it decrease the aggregate arrival rate which result in less retransmission times. This tradeoff leads us to consider the optimal energy efficiency by adjusting backoff time. Thus, we propose optimal tree protocol based on the unified tree protocol by adjusting dynamic backoff time. We also figure out that energy efficiency and delay are based on the general form which we called weighted time. They are only different in parameters setting. Nevertheless, according to unlike assumptions of system constrain, the optimization criterion is also distinct. We show the optimal energy efficiency under general constrain by numerical result.
Subjects
能量效率
整合馬可夫鏈
最佳樹狀協定
energy efficiency
MAC
general Makove chain
optimal tree protocol
SDGs
Type
thesis
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