無線網(wǎng)絡(luò)中平均功率受限的延時(shí)確保調(diào)度機(jī)制的最優(yōu)化研究
The Optimization of Delay-Guarantee Scheduler with Power Constraint in Wireless Networks
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摘要: 該文研究了在高斯信道下平均發(fā)射功率受限的延時(shí)確保調(diào)度器的最優(yōu)化問題。文章首先證明了對(duì)于延時(shí)確保條件下平均發(fā)射功率最優(yōu)的時(shí)不變調(diào)度器，其最優(yōu)的平均發(fā)射功率為延時(shí)確保界Dmax的單調(diào)遞減函數(shù)，并根據(jù)其單調(diào)性給出了平均發(fā)射功率最優(yōu)調(diào)度器和延時(shí)確保最優(yōu)調(diào)度器之間的對(duì)偶關(guān)系?；谠撽P(guān)系，給出了到達(dá)過程未知條件下平均功率受限的延時(shí)確保最優(yōu)調(diào)度器的實(shí)現(xiàn)形式。該實(shí)現(xiàn)形式中參數(shù)的確定方法也在給定到達(dá)過程分布的條件下給出，并以泊松到達(dá)為例進(jìn)行了分析。文章的最后還給出了該調(diào)度器的一種實(shí)際實(shí)現(xiàn)方案并進(jìn)行了仿真，仿真結(jié)果表明該方案能夠達(dá)到調(diào)度器的最優(yōu)。
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關(guān)鍵詞:
- 調(diào)度;延時(shí)確保;功率控制
Abstract: In this paper, packet scheduling with average transmit power constraint over Gaussian channels is considered with the objective to minimize the maximum delay constraint. It is proved that the optimal average transmit power is decreased with the maximum delay constraint for non-time-varying schedulers with maximum delay constraint. Then the equivalence between the optimal scheduler for average transmit power and for maximum delay constraint is proved according to the decreasing property. Then, the form of non-time-varying optimal scheduler based on this equivalence is given. The schedulers parameter, which also reflects the performance, is determined under some certain arrival process, with an example of Poisson arrival. A practical design for this scheduler is presented and simulations show that this design can realize the optimal scheduler. -
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