車輛異構(gòu)網(wǎng)絡(luò)中預(yù)測(cè)垂直切換算法
doi: 10.11999/JEIT140845 cstr: 32379.14.JEIT140845
基金項(xiàng)目:
國(guó)家自然科學(xué)基金(61271259, 61301123, 61471076)；重慶市教委科學(xué)技術(shù)研究項(xiàng)目(KJ130536)和重慶市計(jì)算機(jī)網(wǎng)絡(luò)與通信技術(shù)重點(diǎn)實(shí)驗(yàn)室基金(CY-CNCL-2010-02)資助課題
Prediction Vertical Handoff Algorithm in Vehicle Heterogeneous Network
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摘要: 在車輛異構(gòu)網(wǎng)絡(luò)中，針對(duì)垂直切換決策時(shí)刻之后網(wǎng)絡(luò)狀態(tài)的動(dòng)態(tài)變化，提高切換性能問(wèn)題，提出一種基于馬爾可夫過(guò)程的預(yù)測(cè)垂直切換(M-VHO)算法。算法考慮了切換決策后網(wǎng)絡(luò)狀態(tài)的動(dòng)態(tài)變化對(duì)車輛終端服務(wù)質(zhì)量(QoS)的影響。其基本思路是：在需要垂直切換時(shí)，利用馬爾可夫過(guò)程的轉(zhuǎn)移概率預(yù)測(cè)未來(lái)網(wǎng)絡(luò)狀態(tài)的變化；另外，采用模糊邏輯方法確定評(píng)價(jià)屬性參數(shù)權(quán)重；最后，比較切換決策、切換執(zhí)行和切換之后時(shí)刻的總收益來(lái)優(yōu)化選擇最佳切換網(wǎng)絡(luò)。仿真結(jié)果證明，該算法在確保較高負(fù)載均衡的情況下，可有效改進(jìn)車輛終端的平均阻塞率及丟包率，降低乒乓效應(yīng)，確保了車輛終端的QoS。
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關(guān)鍵詞:
- 無(wú)線網(wǎng)絡(luò) /
- 車輛異構(gòu)網(wǎng)絡(luò) /
- 垂直切換 /
- 馬爾可夫過(guò)程 /
- 模糊邏輯
Abstract: A prediction Vertical HandOff (M-VHO) algorithm is proposed by using a Markov process in vehicle heterogeneous network, to improve handoff performance when network status dynamic transformation after the handoff decision. It takes into account influence of network status dynamic transformation on vehicle terminals Quality of Service (QoS) after the handoff decision. Its basic idea is in that a future wireless networks status transformation is predicted by transition probability of Markov process if vertical handoff is required; otherwise, the weight of evaluating attribute parameters be determined by fuzzy logic method; finally, the total incomes of each wireless network are compare, including handoff decision incomes, handoff execution incomes and communication service incomes after handoff execution, and the optimal network is selected. The simulation results show that when the high load balanced situation is ensured the algorithm effectively improves the average blocking rate and packet loss rate of vehicle terminal, reduces the ping-pong effect, and insure the QoS of vehicle terminal.-
Key words:
- Wireless network /
- Vehicle heterogeneous network /
- Vertical handoff /
- Markov process /
- Fuzzy logic
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