Minimizing 802.11 interference on Zigbee medical sensors

Hou, James; Chang, Benjamin; Cho, Dae-Ki; Gerla, Mário

doi:10.4108/icst.bodynets2009.6029

Cited by 63 publications

(42 citation statements)

References 2 publications

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“…7 Finally, Bluetooth is ubiquitous 7 Crossbow reported that packet loss caused by WiFi interference was relatively low (<15%) in their tested scenario [50], but recent measurement results show that a ZigBee network may experience much higher packet loss rate [51], [49], [52]. Thus, several interference mitigation strategies have been proposed [49], [52]. Musȃloiu-E et al [49] proposed a method of estimating the degree of WiFi interference to dynamically switch frequencies when interference is detected.…”

Section: Discussionmentioning

confidence: 99%

“…Musȃloiu-E et al [49] proposed a method of estimating the degree of WiFi interference to dynamically switch frequencies when interference is detected. Ho et al [52] proposed to use dual radio interfaces (ZigBee and WiFi) such that before ZigBee data transfer, a WiFi RTS/CTS is sent first to keep interfering WiFi devices quiescent. in portable devices.…”

Section: Discussionmentioning

confidence: 99%

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P2P Content Distribution to Mobile Bluetooth Users

Lee¹,

Jung

Cho

et al. 2010

IEEE Trans. Veh. Technol.

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Abstract-Using handheld devices such as cellular phones and smart phones for personal entertainment has become commonplace in today's lifestyle. Virtually all of these devices are equipped with Bluetooth technology that can be used to distribute entertainment contents such as music and movie clips. Mobile users can download content from the opportunistically available infrastructure (e.g., Digital Billboards) as well as direct Peer-toPeer (P2P) collaboration which significantly increases content availability/coverage. P2P content distribution protocol design is heavily influenced by the characteristics of Bluetooth, which is the main departure from Internet-based content distribution. However, little has been done to understand the performance of overall Bluetooth operations, ranging from peer discovery to data downloading, in dynamic environments with mobility, interference, and different Bluetooth versions/chipsets. In this paper, we first perform extensive experiments to measure the performance of Bluetooth in dynamic environments. We find that Bluetooth-based content distribution faces several challenges such as time/energy consuming resource discovery and limited bandwidth even with the enhanced features of the latest Bluetooth version. We then propose strategies that can effectively improve the performance of resource discovery and downloading phases. Our simulation and experimental results document the improvements obtained with our proposed techniques.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

P2P Content Distribution to Mobile Bluetooth Users

Lee¹,

Jung

Cho

et al. 2010

IEEE Trans. Veh. Technol.

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“…A particular signaling mechanism can reserve the competing channel for a low priority network [15,25]. Hou et al [25] utilized a dual-radio system equipped with both ZigBee and Wi-Fi transceivers.…”

Section: Zigbee Communication Protectormentioning

confidence: 99%

“…Hou et al [25] utilized a dual-radio system equipped with both ZigBee and Wi-Fi transceivers. Before transmitting a ZigBee packet, the hybrid device exchanges 802.11 RTS/CTS packets to prevent nearby Wi-Fi networks from sending traffic.…”

Section: Zigbee Communication Protectormentioning

confidence: 99%

NBP: light-weight Narrow Band Protection for ZigBee and Wi-Fi coexistence

Lim

Lee

Yoo

et al. 2013

J Wireless Com Network

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The recent development of various wireless technologies in the 2.4GHz ISM band has led to the co-channel coexistence of heterogeneous wireless devices, such as Wi-Fi, Bluetooth, and ZigBee. This sharing of the common channel results in the challenging problem of cross-technology interference, since the wireless devices generally use diverse PHY/MAC specifications. In particular, the less capable ZigBee device may often experience unpredictably low throughput due to the interference from the powerful Wi-Fi. The ZigBee protector is an attractive solution, since it can reserve the channel on behalf of the weak ZigBee devices. The protector method, however, has a few limitations; (i) it may cause significant overhead to both ZigBee and Wi-Fi, and (ii) the ZigBee control packets are still vulnerable to the Wi-Fi interference. In this paper, we propose a novel time reservation scheme called Narrow Band Protection (NBP), that uses a protector to guard the ongoing ZigBee transmission. The key contributions are threefold: First, NBP autonomously detects any ongoing ZigBee transmissions by cross-correlating the ZigBee's packets with the pre-defined Pseudo-random Noise (PN) sequences. By using this cross-correlation, it significantly reduces the control overhead. Second, due to the reliable cross-correlation, NBP is robust from the control packet collisions, which typically wastes channel time for both ZigBee and Wi-Fi. Third, NBP protects the burst of ZigBee packets by estimating the size of the burst, in turn, giving a semantic to the PN codebook. This is important because ZigBee is typically battery-powered and thus the long burst is advantageous for the low duty cycle operations. We first show the feasibility of NBP by implementing it on the real USRP/GNURadio platform. Then, we evaluate the performance of NBP through mathematical analysis and NS-2 simulations. The results show that NBP enhances the ZigBee throughput by up to 1.77x compared to the existing scheme.

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“…Also, implementing medical devices using wireless technology requires information need to be effectively transmitted from the source device to the targeting device in different scenarios of medical environment [7][8][9][10][11]. Hence, in order to optimize the design and performance of such a wireless system, a proper channel propagation modeling is needed.…”

Section: Introductionmentioning

confidence: 99%

Hybrid Simulation Technique for Characterizing Wireless Channel in Medical Environments

Lee¹,

Bui²

2013

PIER

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Abstract-The purpose of this paper is to investigate the use of simulation technology for the analysis of wireless propagation channel in medical environments. In this paper, the channel modeling has been carried out by using an effective simulation platform, which combines full-wave Method of Moments and adaptive ray tracing technique. Base on this, the channel characteristics involving both large-scale and small-scale parameters of a wireless network deployed within a hospital environment can be estimated. Also, it is straightforward to predict the levels of electromagnetic field interference produced from the network infrastructure. The simulated results of four scenarios of medical environment, such as the patient room, the operating room, a particular level of the hospital, and the cardiac stress test room, with different wireless technologies used show the advantage and capability of the presented simulation approach.

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Minimizing 802.11 interference on Zigbee medical sensors

Cited by 63 publications

References 2 publications

P2P Content Distribution to Mobile Bluetooth Users

P2P Content Distribution to Mobile Bluetooth Users

NBP: light-weight Narrow Band Protection for ZigBee and Wi-Fi coexistence

Hybrid Simulation Technique for Characterizing Wireless Channel in Medical Environments

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