Hwang-Cheng Wang

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LTE has been touted as a leading-edge mobile communication technology offering high data rate and low latency. However, with a sophisticated physical layer to boost performance, the processing demand on user equipment (UE) is tremendous, which implies that the energy consumption is heavy. To curb undesirable energy waste and extend battery life, a variety(More)
802.11 Wireless Local Area Network (WLAN) technology is now common in power sensitive devices like smart phones and personal digital assistants (PDAs). In this article, we present an accurate power consumption model based on the Bianchi model [13] and the power measurement in PHY layer [9] to predict the power consumption of 802.11n and(More)
A wireless ad hoc network typically comprises of nodes with energy supplied by batteries. Hence, energy conservation is crucial to extending the lifetimes of individual nodes and the network as a whole. In topology control type of broadcast algorithms, the distance between neighbors is used to adjust the transmission power to reduce energy consumption. One(More)
In LTE system, it is difficult for an eNB to properly allocate uplink resource blocks (RBs) to UEs as many factors complicate the issue. So far, most research has focused on maximizing system throughput. However, this is often achieved by downgrading other performance metrics and may result in the waste of resources. In this paper, a resource allocation(More)
This paper specifies a global mobility management architecture and protocol procedure called GPMIP, which is based on Proxy Mobile IPv6. In GPMIP, mobility management is performed by the network entity rather than individual mobile nodes. The benefit is the elimination of the wireless link data delivery tunnel overhead between a mobile node and the access(More)
Energy consumption issue is an important research topic in wireless ad hoc networks, because wireless nodes in such networks operate on limited battery power. This paper describes two novel routing algorithms that take into account the effect of distance between nodes and network congestion level on energy consumption. Our algorithms adapt existing AODV(More)
Long-term evolution (LTE) has been heralded as the 4G mobile communication standard to meet the demand for high-speed data transmission. But the heavy processing requirement on the user equipment (UE) leads to excessive power consumption. Discontinuous reception (DRX) is an important mechanism to tackle the issue. Delay and power saving are two(More)
In recent years, portable devices and tablet PCs grow fast and become more convenient and mobile. Applications like multimedia, SIP, and 3D movies become more diverse than before. However, the complex architecture and heavy computing demands increase energy consumption. Therefore, how to extend the standby and usage time of the devices has become an(More)
In the LTE system, it is still a challenge for an eNB to perform resource block (RB) allocation and scheduling. So far, most of the previous works focus on maximizing the system throughput or achieving fairness among User Equipments (UEs). However, allocating RBs without considering the data rate requested by UEs or granted by call admission control (CAC)(More)