一種新的雙模微基站非授權(quán)信道接入方法
doi: 10.11999/JEIT170184
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1.
(東南大學(xué)信息科學(xué)與工程學(xué)院 南京 210096) ②(桂林電子科技大學(xué)認(rèn)知無線電與信息處理教育部重點(diǎn)實(shí)驗(yàn)室 桂林 541004)
國(guó)家自然科學(xué)基金(61471120, 61422105, 61671145),桂林電子科技大學(xué)教育部重點(diǎn)實(shí)驗(yàn)室開放基金(CRKL160203)
A Novel Dual-band Femtocells Unlicensed Channel Access Mechanism
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1.
(School of Information Science and Engineering, Southeast University, Nanjing 210096, China)
The National Natural Science Foundation of China (61471120, 61422105, 61671145), The Key Laboratory of Cognitive Radio and Information Processing, Ministry of Education (Guilin University of Electronic Technology) (CRKL160203)
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摘要: 利用非授權(quán)頻段頻譜資源提升網(wǎng)絡(luò)容量需要有效地解決LTE(Long Term Evaluation)與WiFi的共存問題。最近,學(xué)術(shù)界和工業(yè)界相繼提出了授權(quán)頻段輔助接入機(jī)制和雙模微基站技術(shù)提升蜂窩通信系統(tǒng)容量。考慮雙模微基站與WiFi接入點(diǎn)覆蓋范圍存在部分重疊場(chǎng)景,該文提出一種新的雙模微基站非授權(quán)信道接入機(jī)制及聯(lián)合授權(quán)非授權(quán)的優(yōu)化頻譜資源分配方案。仿真結(jié)果表明,雙模微基站和WiFi接入點(diǎn)互不可見時(shí),新方案相比于現(xiàn)有方案由于考慮了空間復(fù)用具有更好的系統(tǒng)性能;雙模微基站和WiFi接入點(diǎn)互相可見時(shí),新方案與現(xiàn)有方案性能一致,即兩者分時(shí)獨(dú)立占用非授權(quán)頻段頻譜資源。
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關(guān)鍵詞:
- 授權(quán)頻段輔助接入 /
- 雙模微基站 /
- 信道接入機(jī)制 /
- 資源分配 /
- 覆蓋重疊
Abstract: In order to efficiently utilize the unlicensed band to improve the network capacity, it is necessary to solve the problem of the coexistence between Long Term Evaluation (LTE) and WiFi. Licensed-Assisted Access (LAA) and the Dual-Band Femtocell (DBF) which can access both the licensed and unlicensed bands are proposed recently. In this paper, considering the case that a DBF partly overlaps with just one WiFi Access Point (AP), a novel DBF unlicensed channel access mechanism is proposed. Then, the optimal traffic balancing scheme over licensed and unlicensed bands considering the effect of coverage overlap is developed. Numerical results show that if DBF and WiFi AP are invisible mutually, the proposed scheme outperforms the existing scheme in terms of sum utility and throughput because of extra fraction of unlicensed channel time for DBF using spatial reuse. Otherwise the performance is the same as the existing scheme, that is, DBF and WiFi AP use the unlicensed band alternately. -
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