Browsing by Author "Chou, Chie Ming"

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Efficient Paging Control for Carrier Aggregation in LTE-A System
(2012-01-01)
Chou, Chie Ming
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Huang, Ching Yao
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
This paper studies paging operation when carrier aggregation (CA) is adopted in LTE-A system. A numerical analysis is provided and shows signaling overhead would increase significantly if paging is not properly controlled under CA. To overcome the problem, efficient paging controls are proposed while adaptive paging configurations on different component carrier are able to resist excessive overhead. In additional, a hierarchical paging message delivery scheme is jointly controlled to take paging latency into account. The results demonstrate that our proposal can work well in different environments with minimum changes in 3GPP specification.
Loading Prediction and Barring Controls for Machine Type Communication
(2013-01-01)
Chou, Chie Ming
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Huang, Ching Yao
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Chiu, Chun-Yuan
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電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Machine Type Communication (MTC) is a very distinct technology that enables the "Internet of things". Overload that caused by a large number of MTC device is one of the primary issues for supporting MTC. Extended Access Barring (EAB) is a barring mechanism for long-term evolution (LTE) network to selectively control access attempts in order to prevent overload. In the paper, a method to predict access loading and adapt a barring ratio for EAB is designed. The simulation results show the proposal could relieve overload significantly without aggressively barring.
Novel vertical handover control algorithm for WLAN and UMTS
(2007-04-26)
Huang, Ching Yao
;
Chou, Chie Ming
In this invention, a novel vertical handover control algorithm, consisting of a throughput-based mapping function, QoS-based dynamic handover thresholds, and performance-based trigger timers, are proposed to resolve uncommon pilot problem, QoS requirements, and ping-pong effects, respectively. An analytic model based on a finite state machine is developed to evaluate the proposed algorithm in terms of the handover frequency and achievable throughput. A numerical analysis is also provided to further quantify the performance impacts.
Triggering and Relay Node Selection for Self-User Relaying
(2015-11-01)
Chou, Chie Ming
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Huang, Ching-Yao
;
電子工程學系及電子研究所
;
Department of Electronics Engineering and Institute of Electronics
Self-user relaying technology is designed to support multiple self-owned devices especially when wearable devices are becoming more popular. In this letter, with a consideration of power control and discontinuous reception mechanism, a power model and energy metric are derived to analyze self-user relaying performance. Results show that under a typical traffic model, self-user relaying can improve energy performance when the relay node itself has the maximum traffic volume. Additionally, a simple battery budget threshold based relay node selection is suggested for limited battery budget of nodes.