基于模糊邏輯的呼叫允許控制研究
Call Admission Control Using Fuzzy Logic in Wireless Networks
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摘要: 無線頻譜資源的缺乏以及用戶的移動性使無線網(wǎng)絡(luò)的服務(wù)質(zhì)量的供給成為一個日益嚴峻的問題。為了滿足服務(wù)質(zhì)量的需要，該文提出蜂窩移動通信系統(tǒng)的一種模糊呼叫允許控制方案。它自動搜尋基站中保護信道數(shù)量的最優(yōu)值，使資源得到合理的利用并保證服務(wù)質(zhì)量的供給。對提出的模糊方案和一種動態(tài)信道預(yù)留方案進行了仿真比較，仿真結(jié)果表明模糊方案具有較強的魯棒性，方案的呼叫阻止率、切換掉線率和信道利用率等性能參數(shù)都優(yōu)于自適應(yīng)方案。
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關(guān)鍵詞:
- 無線網(wǎng)絡(luò);模糊;呼叫允許控制;服務(wù)質(zhì)量;保護信道
Abstract: Scarcity of the spectrum resource and mobility of users make Quality-of-Service(QoS) provision a critical issue in wireless networks. This paper presents a fuzzy call admission control scheme to meet the requirement of QoS. It searches automatically the optimal number of the guard channels in a base station to make an effective use of resource and guarantee the QoS provision. Simulation compares the proposed fuzzy scheme with a dynamic channel reservation scheme. Simulation results show fuzzy scheme has a better robust performance. It outperforms the adaptive scheme in terms of call dropping probability, call blocking probability, and channel utilization. -
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