基于認(rèn)知的LTE系統(tǒng)動(dòng)態(tài)頻譜分配
doi: 10.11999/JEIT140001 cstr: 32379.14.JEIT140001
基金項(xiàng)目:
國家自然科學(xué)基金重點(diǎn)項(xiàng)目(61231008)，重大專項(xiàng)(2012ZX03003005-005)，國家自然科學(xué)基金(61102057)，高等學(xué)校引智計(jì)劃(B08038)，長江學(xué)者和創(chuàng)新團(tuán)隊(duì)發(fā)展計(jì)劃(IRT0852)和中央高?；究蒲袠I(yè)務(wù)費(fèi)(K5051301014)資助課題
Dynamic Spectrum Allocation for LTE System by Exploiting Cognitive Capability
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摘要: 傳統(tǒng)的軟頻率復(fù)用(SFR)無法適應(yīng)長期演進(jìn)(LTE)系統(tǒng)中業(yè)務(wù)的動(dòng)態(tài)分布，可能導(dǎo)致小區(qū)中心和邊緣區(qū)域頻譜利用率不均。針對此問題，該文提出一種基于認(rèn)知的LTE系統(tǒng)動(dòng)態(tài)頻譜分配方法(Cog-DSA)。該方法利用基站間的相互協(xié)作獲得頻譜使用狀態(tài)信息，從而確定可用頻譜集合，并評估來自鄰小區(qū)的同頻干擾，最終根據(jù)可用資源塊的通信質(zhì)量，對重負(fù)荷小區(qū)邊緣進(jìn)行頻譜的動(dòng)態(tài)借用和服務(wù)基站的靈活選擇。仿真結(jié)果表明，所提方法能夠有效改善頻譜利用率，減少小區(qū)間干擾，顯著提升邊緣用戶的傳輸速率。
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關(guān)鍵詞:
- 無線通信 /
- 頻譜分配 /
- 長期演進(jìn) /
- 軟頻率復(fù)用 /
- 認(rèn)知技術(shù)
Abstract: Traditional Soft Frequency Reuse (SFR) can not adapt to dynamic traffic distribution in Long Term Evolution (LTE) systems, leading to imbalanced spectral efficiency in cell center and edge area. In order to solve this problem, this paper proposes a Dynamic Spectrum Allocation scheme for LTE system by exploiting Cognitive capability (Cog-DSA). By exploiting inter base station cooperation, spectrum use status is acquired. Then the available spectrum set is determined and co-channel interference from adjacent cells is evaluated. Finally, dynamic spectrum borrowing and service base station selection are implemented. Simulation results demonstrate that the proposed Cog-DSA method can effectively improve the spectrum utilization, mitigate inter-cell interference and significantly raise cell edge users' transmission rate. -
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