Integrating Time-Domain and Spatial-Domain Energy Conservation Policies for LTE Base Station and Mobile Device

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Project title

Code/計畫編號

NSC102-2221-E019-031

Translated Name/計畫中文名

應用於LTE 系統用戶端及基地台之時序與空間導向節能策略

Project Coordinator/計畫主持人

Haw-Yun Shin

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Computer Science and Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=3110614

Year

2013

Start date/計畫起

01-08-2013

Expected Completion/計畫迄

31-07-2014

Bugetid/研究經費

511千元

ResearchField/研究領域

資訊工程--硬體工程

隨著行動通訊用戶數量增加，全球的碳排放量與通訊網路的能源消耗也隨之增加，近年學術界和產業界的研究重點，不僅僅著重於使用者的服務品質(QoS)，也同時朝向降低整體網路能源的消耗的目標進行研發。無線網路環境可概略分為基地台(base station) 與無線裝置(wireless device)，以往大部分的研究著重於延長無線裝置端使用時間的節能策略；然而，以整體無線網路環境而言，基地台所消耗的能源遠大於無線裝置端。部分研究提出無線基地台的睡眠模式(sleep mode)，其利用關閉低負載的基地台進行節能，將該地區使用者改由鄰近的基地台提供服務，此方法雖然成功降低整體無線網路環境的能源消耗，卻也降低了使用者的 QoS。本計畫提出無線網路系統整體節能策略，對於基地台端，我們整合時序導向(time-domain)與空間導向(spatial-domain)兩種睡眠模式，降低非必要的控制訊號數量以及有策略的間歇關閉基地台傳輸能力，藉由減少基地台中的高耗能元件運作時間，達到節能目的，並且兼顧使用者的 QoS。在無線裝置端，我們提出一種廣播訊息排程演算法與資料搜尋演算法，降低無線裝置接收廣播訊息的平均調諧時間(tuning time)以及平均讀取時間(access time)，達到延長無線裝置端電源使用時間的目的。本計畫提出之 time-domain 與 spatial-domain 之節能策略皆符合 LTE 架構規範，使用於無線裝置端之廣播節能機制也將應用 LTE 系統中之非連續傳送/接收(DRX/DTX)機制加以實現，預期於基地台端及裝置端皆能獲得很好的節能效益。降低基地台耗能，是基於環保節能角度必然要進行的方向，然而，系統與使用者裝置的節能效益與服務品質存在有互斥性，本研究將尋求其最佳平衡點。 The increasing number of mobile communications users has increased global carbon emissions and energy consumption (by communications networks). Therefore, although quality of service (QoS) for users has been a significant research issue, industrialists and academicians are now focusing their efforts on reducing the energy consumed by these networks. Wireless networks can be roughly divided into a base station and a wireless device. Much previous research has discussed energy conservation strategies on the wireless device end. From an overall system perspective, however, the energy consumption of the base station far exceeds that of the wireless device. A number of studies have proposed a sleep mode for base stations. To conserve energy, this mode switches off base stations with low load. Users in the area are then re-directed to and serviced by neighboring base stations. Although this method successfully reduces the energy consumption of the overall wireless network, it also reduces QoS for users. This study proposes an energy conservation strategy for wireless network systems. For base stations, we integrated time-domain and spatial-domain sleep modes to reduce unnecessary control signals and intermittently switch off transmission power. By reducing the operation time of high-energy components in the base station, the objective of energy conservation is achieved without detracting from QoS. On the wireless device end, this study developed a type of broadcast scheduling algorithm and data search algorithm to reduce the average tuning time and access time of wireless devices when receiving broadcasts. This extends the life of the devices’ power supply. The time-domain and spatial-domain sleep modes proposed by this study comply with LTE framework regulations. We also incorporated the LTE discontinuous reception/transmission (DRX/DTX) mechanisms into energy conservation strategies for the wireless device end. Reducing the energy consumed by base stations is clearly vital to environmental protection and energy conservation. A frequently encountered difficulty, however, is that energy efficiency and QoS can be mutually exclusive constructs. The results of this study provide an optimal balance between both requirements.

Keyword(s)

LTE
基地台節能
無線廣播
時序導向
空間導向
服務品質
MIMO
LTE
energy conservation
wireless broadcasting
time-domain
spatial-domain
QoS
MIMO

DSpace CRIS

Integrating Time-Domain and Spatial-Domain Energy Conservation Policies for LTE Base Station and Mobile Device

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