Tradeoff Design of Radio Resource Scheduling for Power and Spectrum Utilizations in LTE Uplink System

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孔翠玉(KONG CUIYU) 查詢紙本館藏

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通訊工程學系

論文名稱

(Tradeoff Design of Radio Resource Scheduling for Power and Spectrum Utilizations in LTE Uplink System)

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摘要(中)

在無線寬頻網路中，由於行動載具體積變小以及裝置電池電量有限，省電技術越來越重要。因此，在LTE網路中如何節省使用者的電力成為一個重要的議題。因為使用者可以通過調整傳送電力來達到更好的傳送效果，因此這個議題對於LTE 上行鏈路來說是很重要。同時，在系統頻寬有限以及系統traffic load較重的條件下，爲了達到更高的服務品質以及更高的傳送速率，如何節省系統頻寬，達到更高的吞吐量也是一個相當重要的議題。
本論文提出一種新的方法，該方法是在無線電資源分配中能夠動態採用省電和省頻寬的方法，讓系統能平衡省電與省頻寬。在本論文的方法中，系統會根據目前系統的狀態來動態調整資源分配的方法。當系統頻寬充足時，系統在資源分配中會以節省使用者電力為目的；當系統頻寬不足，使用者較多時，爲了服務更多的使用者以及保證使用者服務品質和傳送資料速率，系統在資源分配中以節省頻寬為目的。在本論文資源分配方法中會考慮使用者動態變化的通道狀況，不同的traffic型態以及使用者的服務品質幾個因素。同時，爲了保證有更多連續性的RB來滿足有較大資料傳送的使用者需求，而不產生更多的segment，本論文在RB連續性的特點下設計了segment選擇以及RB選擇的權重公式。
模擬結果顯示，本論文提出的動態調整資源分配的混合方法達到了預期不錯的效果。該混合方法融合了省電與省頻寬方法的優點，如低功率消耗，低封包丟棄率，高的吞吐量以及可以服務更多的使用者。
關鍵字:LTE 上行鏈路、無線電資源分配、省電與省頻寬的混合方法

摘要(英)

Energy efficiency in wireless broadband network is increasingly crucial because of the shrinking size and the battery constraint of mobile devices. Therefore, to save user equipment (UE) power is an important issue in the LTE network. This issue is relatively more critical for the uplink traffic because UE can adjust its transmission power for better transmission performance. Meanwhile, under the condition of limited spectrum and heavy traffic load in system, spectrum efficiency is also important resulting from the pursuits of high QoS service and high data rate.
In this thesis, we propose a novel scheme, the tradeoff scheme for heuristically adopting power-saving and spectrum-saving radio resource allocations. In the proposed scheme, the system can dynamically adjust the resource allocation methods according to the current system condition. When the spectrum is rich enough to serve UE, the resource allocation aims to save UE’s power; when the traffic load is heavy, it aims to save the spectrum to serve more UEs and guarantee UE’s QoS and data rate request. The proposed scheme considers UE’s changeable channel condition, different traffic types, and UE’s QoS in the decision of scheduling priority. Furthermore, in order to offer large continuous resource blocks (RB) for UE with huge data requirement, and not to break the spectrum into many segments, weighting function of segment selection and procedure of RB selection are designed along with the characteristic of RB continuity.
Simulation results show that the proposed hybrid scheme achieves great desired performance on the dynamically tradeoff between power-saving and spectrum-saving method. The hybrid power-saving and spectrum-saving scheme achieves the great advantages of both two methods, for example, the low power consumption, the low packet dropping rate, high throughput, and more UEs to be served.

關鍵字(中)

關鍵字(英)

★ LTE uplink
★ Radio Resource Scheduling
★ Hybrid Power-saving and Spectrum-saving Method

論文目次

中文摘要 I
ABSTRACT II
誌謝 IV
OUTLINE V
FIGURE VII
TABLE IX
CHAPTER 1 INTRODUCTION 1
1.1 BACKGROUND 1
1.2 MOTIVATIONS 2
1.3 CHAPTER OUTLINE 3
CHAPTER 2 RESEARCH BACKGROUND 4
2.1 LTE SYSTEM ARCHITECTURE 4
2.2 FRAME STRUCTURE 6
2.3 SC-FDMA OVERVIEW 8
2.4 BUFFER STATUS REPORT10ING 10
2.5 CHANNEL BANDWIDTH AND MODULATION SCHEMES 11
2.6 RELATED WORKS 12
CHAPTER 3 TRADEOFF BETWEEN PS AND SS RESOURCE ALLOCATION 19
3.1 SYSTEM ARCHITECTURE 19
3.2 POWER CONSUMPTION AND SNR 21
3.3 UE SELECTION 23
3.4 PS/SS METHOD SELECTION 25
3.5 RESOURCE ALLOCATION 28
3.5.1 Power-saving method 28
3.5.2 Spectrum-saving method 34
CHAPTER 4 PERFORMANCE SIMULATIONS 37
4.1 SIMULATION MODEL 37
4.2 TRAFFIC MODEL 38
4.2.1 Video streaming 38
4.2.2 FTP 39
4.3 SIMULATION RESULTS 40
4.3.1 Throughput performance 42
4.3.2 Power performance 43
4.3.3 Energy efficiency performance 44
4.3.4 UE’s dropping rate 45
4.3.5 UE’s packet delay time 47
4.3.6 RB utilization 49
CHAPTER 5 CONCLUSIONS 61
REFERENCE 62

參考文獻

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指導教授

陳彥文

審核日期

2013-7-11

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