Abstract
Outfitting humans with on-body/in-body sensor nodes, wireless body area networks (WBANs) are positioned as the key technology to enhance future telehealth service. The newly emerged wireless power transfer (WPT) and energy harvesting (EH) technology provides a potential of continuous power supply for WBANs. Since the radio frequency (RF) signals can carry energy as well as information at the same time, the time switching between the WPT phase and the wireless information transfer (WIT) phase should be carefully scheduled. By considering a telehealth application scenario (in which multiple patients coexist in a ward and each of them is monitored by multiple sensor nodes), this paper proposes to allocate the duty cycles for the WPT and WIT phases and schedule the transmission time for the WIT links in a joint manner. First, a frame structure for simultaneous information and power transfer (SWIPT) is designed over the time-and-spectrum domain. With the aim to satisfy the minimum rate demands of all the sensor nodes, the optimal duty time for the WPT phase and the optimal transmission time for the WIT links are jointly found by using the convex optimization technique. Finally, a fast algorithm is developed to search the optimal solution by introducing an admission control. The simulation results show that the proposed algorithm can effectively exploit the broadcasting property of RF energy radiation. If the network load were controlled below a certain level, the rate demands of all the sensor nodes in the network can be satisfied.
Highlights
Wireless body area network (WBAN) [1] is a key technology to enable information communication in next-generation patient-centric telehealth
According to the aforementioned system settings, the designed SWIPT mechanism for the wireless-powered WBAN consists of the following three sequential phases: the wireless power transfer (WPT) phase, the first wireless information transfer (WIT) phase, and the second WIT phase. e detail is described as follows
In order to testify the resource management and quality of service (QoS) assurance capabilities, this section shows the simulation results of the proposed time switching and transmission scheduling scheme. e simulated wireless-powered WBAN is illustrated in Figure 1, in which multiple patients are monitored by a number of on-body/in-body sensor nodes in a hospital ward of 10 m long, 10 m wide, and 3 m height. e unique access point (AP) is mounted on the center of the ward ceiling, and the coordinate is (5 m, 5 m, 3 m)
Summary
Wireless body area network (WBAN) [1] is a key technology to enable information communication in next-generation patient-centric telehealth. Patients are outfitted with wearable, miniaturized, and low-power wireless sensor nodes Body area information such as body vital signs, human motions, and surrounding environment status can be measured and wirelessly reported to telehealth providers or seamlessly integrated with patients’ medical record without interrupting their normal activities [2]. (1) An integrated data and energy frame structure (over the time-and-spectrum domain) is proposed for the SWIPT-based multiuser WBANs (2) Under the promise to satisfy the minimum rate demands of all the on-body/in-body sensor nodes, the optimal duty time for the WPT links and the optimal transmission time for WIT links are jointly found by using the convex optimization technique (3) By introducing an admission control mechanism, a fast algorithm is proposed to search the optimal solution of the joint WPT and WIT scheduling problem e rest of this paper is organized as follows.
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