異構(gòu)無線網(wǎng)絡(luò)中基于模糊邏輯的分級垂直切換算法
doi: 10.11999/JEIT190190
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重慶郵電大學(xué)計算機科學(xué)與技術(shù)學(xué)院 ??重慶 ??400065
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重慶郵電大學(xué)重慶市計算機網(wǎng)絡(luò)與通信技術(shù)重點實驗室 ??重慶 ??400065
A Hierarchical Vertical Handover Algorithm Based on Fuzzy Logic in Heterogeneous Wireless Networks
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Institute of Computer Science and Technology, Chongqing University of Post and Telecommunications, Chongqing 400065, China
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Chongqing Key Laboratory of Computer Network and Communication Technology, Chongqing University of Post and Telecommunications, Chongqing 400065, China
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摘要:
在異構(gòu)無線網(wǎng)絡(luò)中,針對綜合考慮網(wǎng)絡(luò)端和用戶端參數(shù)的垂直切換算法,參數(shù)權(quán)重難以確定,同時基于模糊邏輯的垂直切換算法存在復(fù)雜度高的問題,該文提出一種基于模糊邏輯的分級垂直切換算法。首先,將接收信號強度(RSS)、帶寬、時延輸入到1級模糊邏輯系統(tǒng),結(jié)合規(guī)則自適應(yīng)匹配,推理出QoS模糊值,并通過QoS模糊值對網(wǎng)絡(luò)進行初步篩選得到候選網(wǎng)絡(luò)集;然后通過觸發(fā)機制觸發(fā)2級模糊邏輯系統(tǒng),并將候選網(wǎng)絡(luò)的QoS模糊值、網(wǎng)絡(luò)負載率、用戶接入費用輸入2級模糊邏輯系統(tǒng),同時結(jié)合規(guī)則自適應(yīng)匹配,得到輸出判決值,從而選擇最佳接入網(wǎng)絡(luò)。最后,實驗結(jié)果表明,該算法能保證網(wǎng)絡(luò)性能的同時,降低系統(tǒng)的時間開銷。
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關(guān)鍵詞:
- 異構(gòu)無線網(wǎng)絡(luò) /
- 模糊邏輯 /
- 復(fù)雜度 /
- 自適應(yīng)規(guī)則匹配 /
- 觸發(fā)機制
Abstract:In the heterogeneous wireless networks, the parameter weight is difficult to determine for the vertical handover algorithm considering the parameters of the network and the user, at the same time, the vertical handover algorithm based on fuzzy logic has high complexity. Considering this problem, a hierarchical vertical handover algorithm based on fuzzy logic is proposed. Firstly, the Received Signal Strength (RSS), bandwidth and delay are input into the first-level fuzzy logic system. Combining with the rule adaptive matching, the QoS fuzzy value is inferred, and the network is initially filtered by the QoS fuzzy value to obtain the candidate network set; Then, the second-level fuzzy logic system is triggered by the trigger mechanism, and the QoS fuzzy value, network load rate and user access cost of the candidate network are input into the second-level fuzzy logic system. At the same time, the output decision value is obtained by combining the adaptive rule matching, so as to select the best access network. Finally, the experimental results show that the algorithm can guarantee the network performance while reducing the time cost of the system.
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Key words:
- Heterogeneous wireless networks /
- Fuzzy logic /
- Complexity /
- Rule adaptive matching /
- Trigger mechanism
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表 1 部分模糊規(guī)則示例
If and and Then If and and Then RSS 帶寬 時延 QoS QoS 負載率 接入費用 判決值 低 低 低 低 低 低 低 低 低 中 低 低 低 低 中 低 低 高 低 低 低 低 高 低 中 中 中 中 中 低 低 高 中 中 高 低 中 中 中 中 高 高 低 高 高 低 低 高 高 高 中 高 高 中 低 高 高 低 高 低 高 高 中 中 下載: 導(dǎo)出CSV
表 2 候選網(wǎng)絡(luò)的參數(shù)值
網(wǎng)絡(luò) 帶寬(kbps) 時延(ms) 發(fā)送功率(dBm) 路徑損失(dBm) 接入費用(元) LTE 310 48 30 33 0.6 WLAN1 4100 105 20 54 0.1 WLAN2 6900 180 20 54 0.4 WLAN3 6500 80 20 54 0.5 下載: 導(dǎo)出CSV
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