發(fā)布時(shí)間：2018-07-05 02:27

  本文選題：LTE-A + 小基站增強(qiáng)��； 參考：《北京交通大學(xué)》2014年碩士論文

【摘要】：由第三代合作伙伴計(jì)劃(the3rd Generation Partnership Project,3GPP)主導(dǎo)和推動(dòng)的升級(jí)版長(zhǎng)期演進(jìn)(Long Term Evolution Advanced, LTE-A)已經(jīng)成為當(dāng)前廣泛使用的第四代移動(dòng)通信標(biāo)準(zhǔn)。LTE-A中采用了多天線增強(qiáng)、載波聚合、多點(diǎn)協(xié)作傳輸和中繼通信等新技術(shù),在頻譜效率、系統(tǒng)帶寬、峰值傳輸速率等方面較之前有了大幅度的提高。作為迄今為止發(fā)展最快的移動(dòng)通信技術(shù),LTE-A也不斷面臨著新的挑戰(zhàn)。隨著移動(dòng)通信用戶需求的不斷激增,小型基站(Small Cell)成為業(yè)內(nèi)大部分運(yùn)營(yíng)商和設(shè)備商擴(kuò)展系統(tǒng)容量的首選解決方案。受到廣泛關(guān)注的Small Cell增強(qiáng)技術(shù)有望在2014年6月寫(xiě)入3GPP Release-12技術(shù)規(guī)范中。 Small Cell的發(fā)射功率較小,可以部署在熱點(diǎn)地區(qū)有效地提升系統(tǒng)容量、改善用戶體驗(yàn)。Small Cell的應(yīng)用帶來(lái)了新的機(jī)遇,也引入了新的難題。Small Cell的大量部署會(huì)造成小區(qū)間交疊區(qū)域增加,由于LTE-A一般采用同頻組網(wǎng)模式,交疊區(qū)域增加意味著小區(qū)間干擾加劇。為了應(yīng)對(duì)小區(qū)間干擾,LTE中已經(jīng)有了一些較為成熟的技術(shù),如部分頻率復(fù)用、軟頻率復(fù)用等,但這些技術(shù)對(duì)于Small Cell場(chǎng)景的增益十分有限而且部署難度很大。增強(qiáng)型小區(qū)間干擾協(xié)調(diào)(nhanced Inter-Cell Interference Coordination, eICIC)是LTE-A中引入的一種干擾協(xié)調(diào)技術(shù),通過(guò)時(shí)域上的資源分配,配合小區(qū)范圍擴(kuò)展技術(shù),可以在分流用戶到Small Cell的同時(shí)改善Small Cell小區(qū)用戶的信道條件,能夠有效改善系統(tǒng)整體性能。本文還引入了一種新的載波類型(New Carrier Type, NCT),通過(guò)合理設(shè)計(jì),能夠壓縮原有LTE-A系統(tǒng)中載波的參考信號(hào)的開(kāi)銷,由此可以減少能源消耗、提高資源利用率并進(jìn)一步減少小區(qū)間干擾、獲得系統(tǒng)性能的增益。不過(guò),由于NCT壓縮了公共參考信號(hào),將導(dǎo)致LTE Release-8的用戶無(wú)法正常工作,因此NCT不具備后向可兼容性,在標(biāo)準(zhǔn)化的進(jìn)程中需要將謹(jǐn)慎考慮。 為了準(zhǔn)確評(píng)估技術(shù)方案的可行性和系統(tǒng)增益,本文采用了按照3GPP小型基站增強(qiáng)(Small Cell Enhancements, SCE)仿真場(chǎng)景搭建的LTE-A系統(tǒng)級(jí)仿真平臺(tái)。本文將eICIC技術(shù)引入SCE場(chǎng)景中,并利用LTE-A系統(tǒng)級(jí)仿真平臺(tái)分析了eICIC技術(shù)在SCE場(chǎng)景下的系統(tǒng)性能增益,給出了eICIC在SCE場(chǎng)景下的最優(yōu)配置。本文還分析了新載波類型NCT的技術(shù)細(xì)節(jié),通過(guò)理論推導(dǎo)和系統(tǒng)級(jí)仿真得到了NCT的開(kāi)銷壓縮增益和干擾消除增益,驗(yàn)證了NCT在單純宏基站覆蓋和SCE場(chǎng)景下均能提供明顯的系統(tǒng)性能增益。
[Abstract]:The long term Evolution Advanced (LTE-A), led and driven by the the3rd Generation Partnership Project 3GPP, has become the fourth-generation mobile communications standard widely used at present. LTE-A uses multi-antenna enhancement and carrier aggregation. The new technologies, such as multi-point cooperative transmission and relay communication, have greatly improved the spectral efficiency, system bandwidth, peak transmission rate and so on. LTE-A, the fastest developing mobile communication technology, is facing new challenges. With the increasing demand of mobile communication users, small Cell has become the preferred solution for most operators and equipment providers in the industry to expand system capacity. The small Cell enhancement technology, which has attracted wide attention, is expected to be written into the 3GPP Release-12 specification in June 2014. The small Cell has a low transmitting power and can be deployed in hot spots to effectively enhance the system capacity. The application of improving the user experience of Small Cell brings new opportunities, but also introduces new difficulties. The large number of deployment of small Cell will result in the increase of overlapping area between cells, because LTE-A generally adopts the same frequency networking mode. The increase of overlapping regions means that the intercellular interference is increased. In order to deal with the inter-cell interference (LTE), there are some mature technologies, such as partial frequency multiplexing, soft frequency multiplexing, etc., but these techniques have very limited gain for small Cell scenarios and are very difficult to deploy. Enhanced Inter-Cell interference Coordination (eICIC) is a kind of interference coordination technology introduced in LTE-A. At the same time, the channel condition of small cell users can be improved, and the overall performance of the system can be improved effectively. This paper also introduces a new carrier type (NCT), which can compress the cost of the carrier reference signal in the original LTE-A system by reasonable design, which can reduce the energy consumption, improve the resource utilization and further reduce the inter-cell interference. Gain the system performance. However, because the NCT compresses the public reference signal, will cause the LTE Release-8 user to not work properly, therefore the NCT does not have the backward compatibility, will need to consider carefully in the standardization process. In order to evaluate the feasibility and system gain of the technical scheme accurately, the LTE-A system level simulation platform based on the 3GPP small Cell Enhancement (SCE) simulation scenario is adopted in this paper. In this paper, the technology of eICIC is introduced into SCE scenario, and the system performance gain of eICIC in SCE scenario is analyzed by using LTE-A system-level simulation platform, and the optimal configuration of eICIC in SCE scenario is given. This paper also analyzes the technical details of the new carrier type NCT. The overhead compression gain and interference cancellation gain of NCT are obtained by theoretical derivation and system-level simulation. It is verified that NCT can provide obvious system performance gains under pure macro base station coverage and SCE scenarios.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TN929.5

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