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

【摘要】：由第三代合作伙伴計劃(the3rd Generation Partnership Project,3GPP)主導和推動的升級版長期演進(Long Term Evolution Advanced, LTE-A)已經(jīng)成為當前廣泛使用的第四代移動通信標準。LTE-A中采用了多天線增強、載波聚合、多點協(xié)作傳輸和中繼通信等新技術,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)展最快的移動通信技術,LTE-A也不斷面臨著新的挑戰(zhàn)。隨著移動通信用戶需求的不斷激增,小型基站(Small Cell)成為業(yè)內大部分運營商和設備商擴展系統(tǒng)容量的首選解決方案。受到廣泛關注的Small Cell增強技術有望在2014年6月寫入3GPP Release-12技術規(guī)范中。 Small Cell的發(fā)射功率較小,可以部署在熱點地區(qū)有效地提升系統(tǒng)容量、改善用戶體驗。Small Cell的應用帶來了新的機遇,也引入了新的難題。Small Cell的大量部署會造成小區(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。為了應對小區(qū)間干擾,LTE中已經(jīng)有了一些較為成熟的技術,如部分頻率復用、軟頻率復用等,但這些技術對于Small Cell場景的增益十分有限而且部署難度很大。增強型小區(qū)間干擾協(xié)調(nhanced Inter-Cell Interference Coordination, eICIC)是LTE-A中引入的一種干擾協(xié)調技術,通過時域上的資源分配,配合小區(qū)范圍擴展技術,可以在分流用戶到Small Cell的同時改善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),通過合理設計,能夠壓縮原有LTE-A系統(tǒng)中載波的參考信號的開銷,由此可以減少能源消耗、提高資源利用率并進一步減少小區(qū)間干擾、獲得系統(tǒng)性能的增益。不過,由于NCT壓縮了公共參考信號,將導致LTE Release-8的用戶無法正常工作,因此NCT不具備后向可兼容性,在標準化的進程中需要將謹慎考慮。 為了準確評估技術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(Small Cell Enhancements, SCE)仿真場景搭建的LTE-A系統(tǒng)級仿真平臺。本文將eICIC技術引入SCE場景中,并利用LTE-A系統(tǒng)級仿真平臺分析了eICIC技術在SCE場景下的系統(tǒng)性能增益,給出了eICIC在SCE場景下的最優(yōu)配置。本文還分析了新載波類型NCT的技術細節(jié),通過理論推導和系統(tǒng)級仿真得到了NCT的開銷壓縮增益和干擾消除增益,驗證了NCT在單純宏基站覆蓋和SCE場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.
【學位授予單位】：北京交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN929.5

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