Browsing by Author "Chan, Tsung-Yen"

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eHint: An Efficient Protocol for Uploading Small-Size IoT Data
(2017-01-01)
Chan, Tsung-Yen
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Ren, Yi
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Tseng, Yu-Chee
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Chen, Jyh-Cheng
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資訊工程學系
IoT (Internet of Things) has attracted a lot of attention recently. IoT devices need to report their data or status to base stations at various frequencies. The IoT communications observed by a base station normally exhibit the following characteristics: (1) massively connected, (2) lightly loaded per packet, and (3) periodical or at least mostly predictable. The current design principals of communication networks, when applied to IoT scenarios, however, do not fit well to these requirements. When a large number of devices contend to send small packets, the signaling overhead is not cost-effective. To address this problem, our previous work [ 1] proposes the Hint protocol, which is slot-based and schedule-oriented for uploading IoT devices' data. In this work, we extend [ 1] to support data transmissions for multiple resource blocks. We assume that the uplink payloads from IoT devices are small, each taking very few slots (or resource blocks), but devices are massive. The main idea is to "encode" information in a tiny broadcast that allows each device to "decode" its transmission slots, thus significantly reducing transmission overheads and contention overheads. Our simulation results verify that the protocol can significantly increase channel utilization compared with traditional schemes.
From Spotting the Difference to Spotting Your Difference
(2015-01-01)
Chan, Tsung-Yen
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Chang, Po-Yen
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Ren, Yi
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Tseng, Yu-Chee
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資訊工程學系
E-healthcare games are a new patient care tool for providing fun, on-line monitoring enabled lifestyle, and a way for redefining traditional doctor-patient relationship. In this work, we demonstrate the use of intelligent sensors to capture patient behaviors for home healthcare. We design a new e-healthcare game user interface, iCube, for monitoring and recording patient activities. The iCube is a 3D game which has six display panels on the surfaces of a 3D cube embedded with a zigbee interface and some sensors for behavior monitoring. To prove its concept, we implement a Spot the Difference game. When a player is playing the game, the iCube can capture the player's hand shaking, rolling response, and visual capability. Those collected data are then sent to a database for spotting the progress/difference of the player over a long period time.
How to Reduce Unexpected eMBMS Session Disconnection: Design and Performance Analysis
(2018-02-01)
Chan, Tsung-Yen
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Ren, Yi
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Tseng, Yu-Chee
;
Chen, Jyh-Cheng
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交大名義發表
In 3GPP evolved multimedia broadcast/multicast service (eMBMS), sometimes sessions will be disconnected unexpectedly due to the miss of session keys. Although rekeying can prevent old users from getting multicast data, it also causes authorized users to miss subsequent data if they miss the key update messages. Thus, re-authentication is needed to obtain lost keys from key management mechanism. We point out this problem in our previous work. In this letter, we further propose a new KeySet algorithm, which can pre-issue a number of keys to users when they join eMBMS. The advantage is that a user can still decode multicast data even if it misses some key updates tentatively. However, the cost is that allowing some old users to freely enjoying multicast. In this letter, we quantify the tradeoff and derive the optimal case.
Multi-Slot Allocation Protocols for Massive IoT Devices With Small-Size Uploading Data
(2019-04-01)
Chan, Tsung-Yen
;
Ren, Yi
;
Tseng, Yu-Chee
;
Chen, Jyh-Cheng
;
資訊工程學系
The emergence of Internet of Things applications introduces new challenges such as massive connectivity and small data transmission. In traditional data transmission protocols, an ID (i.e., IP address or MAC address) is usually included in a packet so that its receiver is able to know who sent the packet. However, this introduces the big head small body problem for light payload. To address this problem, the Hint protocols have been proposed. The main idea is to "encode" information in a tiny broadcast Hint message that allows devices to "decode" their transmission slots. Thus, it can significantly reduce transmission and contention overheads. In this letter, we extend eHint to support multi-slot data transmissions. Several efficient protocols are proposed. Our simulation results validate that the protocols can significantly increase the number of successfully transmitted devices, channel utilization, and payload of transmitted devices compared with eHint.